Materials handling vehicle estimating a speed of a movable assembly from a lift motor speed.
Abstract
Se proporciona un vehículo de manejo de materiales (100) que comprende: una estructura de soporte que incluye un miembro fijo (200); un ensamble móvil acoplado a la estructura de soporte (300); un sistema hidráulico (401); y un sistema de control (1500). La estructura de soporte además comprende un aparato de elevación (400) para efectuar el movimiento del ensamble móvil con relación al miembro fijo de estructura de soporte. El aparato de elevación incluye al menos un ensamble de pistón/cilindro. El sistema hidráulico incluye un motor (301), una bomba (302) acoplada al motor para suministrar un fluido presurizado para al menos un ensamble de pistón/cilindro, y al menos una válvula electrónicamente controlada (420) asociada con al menos un ensamble de pistón/cilindro. La estructura de control puede estimar una velocidad del ensamble móvil a partir de una velocidad del motor y controlar la operación de al menos una válvula utilizando la velocidad estimada del ensamble móvil.

Term
5.4 yearsleft in the term
Expires 13 February 2032.
- Priority
- Filed
- Granted
- Today
- Expires
28 claims: 3 independent, 25 dependent
- 1REIVINDICACIONES 1, - Un vehículo de manejo de materiales que comprende:una estructura de soporte que incluye un miembro fijo;un ensamble móvil acoplado a dicha estructura de soporte;dicha estructura de soporte además comprende un aparato de elevación para efectuar el movimiento de dicho ensamble móvil con relación a dicho miembro fijo de estructura de soporte, dicho aparato de elevación incluye al menos un ensamble de pistón/cilindro;un sistema hidráulico que incluye un motor, una bomba acoplada a dicho motor para suministrar un fluido presurizado a dicho al menos un ensamble de pistón/cilindro, y al menos una válvula electrónicamente controlada asociada con dicho al menos un ensamble de pistón/cilindro;y una estructura de control para estimar una velocidad de dicho ensamble móvil a partir de una velocidad de dicho motor y para controlar la operación de dicha al menos una válvula usando una comparación que involucra la velocidad de ensamble móvil estimada y una velocidad determinada.
- 22, - El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicha estructura de control es capaz de energizar dicha al menos una válvula para abrir dicha al menos una válvula para permitir que dicho ensamble móvil descienda en una forma controlada a una posición deseada con relación a dicho miembro fijo de estructura de soport .
- 3- El v hículo de manejo de materiales.ule-acuerdo coo la reivindicación 2, en donde dicha estructura de control desenergiza dicha al menos una válvula en respuesta a un comando generado por operador para cesar el descenso adicional de dicho ensamble móvil con relación a dicho miembro fijo de estructura de soporte.
- 4- El vehículo de manejo de materiales de acuerdo con la reivindicación 3, en donde dicha al menos una válvula funciona como una válvula de retención cuando se desenergiza para bloquear el fluido presurizado de fluir fuera de dicho o al menos un ensamble de pistón/cilindro, y permitir quo el fluido presurizado fluya dentro de al menos un ensamble de pistón/cilindro durante una operación de elevación de ensamble móvil.
- 5- El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicho al menos una válvula comprende una válvula operada por solenoide, normalmente cerrada, proporcional.
- 6- El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicho al menos un válvula está colocada en una base de dicho al menos un ensamble pistón/cilindro.
- 7- El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde:dicha estructura de soporte comprende una unidad de energía;dicho miembro fijo de estructura de soporte comprende una primera soldadura de mástil fija acoplada a dicha unidad de energía;dicho aparato de elevación comprende: INSTi'íC'· Γ· 5 · ' s una segunda soldadura de mástil que se puede mover con relación a dicha primara soldadura de mástil;una tercera soldadura de mástil que se puede mover con relación a dichas primeras y segundas soldaduras de mástil, 5 dicho al menos un ensamble de pistón/cilindro comprende: al menos un primer ensamble de pistón/cilindro acoplado entre dichas primeras y segundas soldaduras de mástil para efectuar el movimiento de dichas segundas y terceras soldaduras de mástil con relación a dicha primera soldadura de mástil;ío un segundo ensamble de pistón/cilindro acopiado entre dicha tercera soldadura de mástil y dicho ensamble móvil para efectuar el movimiento de dicho ensamble móvil con relación a dicha tercera soldadura de mástil;y dicha al menos una válvula electrónicamente controlada 15 comprende: al menos una primera válvula operada por solenoide, normalmente cerrada, proporcional asociada con dicho al menos un primer ensamble de pistón/cilindro: y una segunda válvula operada por solenoide, normalm nte 20 cerrada, proporcional asociada con dicho segundo ensamble de pistón/cilindro.
- 8- El vehículo de manejo de materiales de acuerdo con la reivindicación 7, en donde dicha estructura de control comprende:un aparato codificador asociado con dicho ensamble móvil para 25 generar pulsos de codificador como dicho ensamble móvil se muev ΐΝίτ;-·;.· ν '-' ' con relación a dicha primera soldadura de mástil;y ___ un controlador acoplado a dicho aparato codificador y dichas válvulas para recibir dichos pulsos de codificador generados por dicho aparato de codificador, y determinar la velocidad de ensamble 5 móvil determinada basándose en los pulsos de codificador.
- 9- El vehículo de manejo de materiales de acuerdo con la reivindicación 8, en donde dicho controlador controla la operación de dicha al menos una primera válvula y dicha segunda válvula mediante la comparación de la velocidad de ensamble móvil ío determinada con al menos una de:una primera velocidad de umbral basándose en la velocidad de ensamble móvil estimada;y una primera velocidad de umbral y una segunda velocidad de umbral fija. 15
- 10- El vehículo de manejo de materiales de acuerdo con la reivindicación 9, en donde dicho controlador funciona para desenergizar dichas primeras y segundas válvulas causando que se muevan de su estado abierto energizado a su estado cerrado en el caso de que dicho ensamble móvil se mueva hacia abajo en el 20 ensamble móvil determinado a una velocidad en exceso de una de la primera y segunda velocidad de umbral.
- 11- El vehículo de manejo de materiales de acuerdo con la reivindicación 10, en donde dicho controlador cierra lentamente dichas primeras y segundas válvulas en el caso que dicho ensamble 25 móvil se mueva hacia abajo a una velocidad en exceso de dicha ΤΓ Τ’ ·'· · Ιλ - C :IÍ4S ! Γ : : . · primera o dicha segunda velocidad de umbral.
- 1212, - El vehículo de manejo de materiales de acuerdo con la reivindicación 11, en donde dicho controlador causa que dichas primeras y segundas válvulas se muevan de su posición abierta 5 energizada a su posición cerrada durante un periodo de tiempo desde aproximadamente 0.3 segundos a aproximadamente 1.0 segundos.
- 13- El vehículo de manejo de materiales de acuerdo con la reivindicación 9, en donde dichas funciones del controlador para ío desenergizar dichas válvulas primera y segunda causando que se muevan de su estado abierto energizado a un estado cerrado parcialmente en el caso que dicho ensamble móvil se mueva hacia abajo en el ensamble móvil determinado a una velocidad en exceso de una de la primera y segunda velocidad de umbral.
- 1415 14. El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicha estructura de control estima la velocidad de ensamble móvil a partir de la velocidad de motor mediante:convertir la velocidad de motor en una velocidad de flujo de fluido de bomba, convertir la velocidad de flujo de fluido de 20 bomba en una velocidad de pistón y convertir la velocidad de pistón en la velocidad estimada de ensamble móvil. 15.- El vehículo de manejo de materiales de acuerdo con la reivindicación 14, en donde dicha estructura de control utiliza una velocidad de ensamble móvil estimada y una velocidad de ensamble 25 móvil determinada para g nerar una eficiencia volumétrica de bomba institc: ,:. . Da i..y< · actualizada y utiliza la eficiencia volum'trica de bomba actualizada cuando calcula una velocidad de ensamble móvil estimada subsecuente.
- 1516. - El vehículo de manejo de materiales de acuerdo con la 5 reivindicación 1, en donde dicha estructura de control está configurada para medir un flujo de corriente eléctrica dentro o fuera de dicho motor de sistema hidráulico y para reducir una velocidad operativa de dicho motor de sistema hidráulico si el flujo de corriente eléctrica dentro o fuera de dicho motor de sistema hidráulico es ío mayor que o igual a un valor de umbral predeterminado.
- 1617, - El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicha estructura de control está configurada para monitorear una presión del fluido presurizado y para implementar una rutina de respuesta que comprende controlar 15 dicha al menos una válvula para controlar el descenso de dicha estructura de soporte si la presión monitoreada cae por abajo de una presión de umbral.
- 1718. - El vehículo de manejo de materiales de acuerdo con la reivindicación 17, en donde la presión de umbral depende de al 20 menos una altura de elevación maxima de dicho ensamble móvil y un peso de una carga soportada por dicha estructura de soporte.
- 1819, - El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicho motor de sistema hidráulico recib energía de una batería para accionar dicho sistema hidráulico de la 25 bomba. IB......' χ INSTITI. C£ I·.·’, i ' [.'¡¿CT. :.:- .1. .............
- 1920 - El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicha estructura de control desenergiza dicha al menos una válvula causando que se mueva de un estado abierto energizado a un estado cerrado parcialmente en el caso que dicho ensamble móvil se mueva hacia abajo en una velocidad de descenso no deseado.
- 2021. - El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicho ensamble móvil se mueve hacia abajo en una velocidad de descenso no deseado cuando la velocidad del ensamble móvil determinado es en exceso de una primera velocidad de umbral basado en la velocidad del ensamble móvil estimada.
- 2122. - Un vehículo de manejo de materiales que comprende:una soldadura de mástil fija;al menos una soldadura de mástil móvil acoplada a dicha soldadura de mástil fija;un aparato de carro de horquilla móvil acoplado a dicha al menos una soldadura de mástil móvil;al menos un primer ensamble de pistón/cilindro acoplado a dicha soldadura de mástil fija y dicha al menos una soldadura de mástil móvil para efectuar el movimiento de dicha al menos una soldadura de mástil móvil con relación a dicha soldadura de mástil fija;un segundo ensamble de pistón/cilindro acoplado a dicho aparato de carro de horquilla y dicha al menos una soldadura de mástil móvil para efectuar el movimiento de dicho aparato de carro r _4... vw.»imjn . J * «i» de horquilla con relación a dicha al menos una soldadura de mástil móvil;un sistema hidráulico que incluye un motor, una bomba 5 acoplada a dicho motor para suministrar un fluido presurizado a dichas primeros y segundos ensambles de pistón/cilindro, y al menos una primera válvula electrónicamente controlada y una segunda válvula electrónicamente controlada asociada con dicho al menos un primer ensamble de cilindro de pistón y dicho segundo ensamble de 10 pistón/cilindro;y una estructura de control para estimar una velocidad de dicho ensamble de carro de horquilla con relación a dicha soldadura de mástil fija a partir de una velocidad de dicho motor y para controlar la operación de dichas primeras y segundas válvulas usando una 15 comparación que involucra la velocidad de ensamble móvil estimada y una velocidad determinada.
- 2223. - El vehículo de manejo de materiales de acuerdo con la reivindicación 22, en donde dicha estructura de control controla la operación de dichas válvulas mediante la comparación de la 20 velocidad determinada y una velocidad de umbra! basándose en la velocidad de aparato de carro de horquilla estimada.
- 2324. - El vehículo de manejo de materiales de acuerdo con la reivindicación 22, en donde dicho motor de sistema hidráulico recibe energía de una batería para accionar dicho sistema hidráulico de la
- 2425 bomba. 25.- El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicho motor de sistema hidráulico recibe energía de una batería para accionar dicho sistema hidráulico de la bomba. 5
- 2526.- El vehículo de manejo de materiales de acuerdo con la reivindicación 18, en donde dicho motor de sistema hidráulico recibe energía de una batería para accionar dicho sistema hidráulico de la bomba.
- 2627, - El vehículo de manejo de materiales de acuerdo con la ío reivindicación 9, en donde dichas funciones del controlador para desenergizar dichas válvulas primera y segunda causando que se muevan de su estado abierto energizado a un estado cerrado parcialmente en el caso que dicho ensamble móvil se mueva hacia abajo en el ensamble móvil determinado a una velocidad en exceso 15 de una de la primera y segunda velocidad de umbral.
- 2728, - El vehículo de manejo de materiales de acuerdo con la reivindicación 1, en donde dicha estructura de control desenergiza dicha al menos una válvula causando que se mueva de un estado abierto energizado a un estado cerrado parcialmente en el caso que 20 dicho ensamble móvil se mueva hacia abajo en una velocidad de descenso no deseado.
- 2829, - El vehículo de manejo de materiales de acuerdo con la reivindicación 28, en donde dicho ensamble móvil se mueve hacia abajo en una velocidad de descenso no deseado cuando la velocidad 25 del ensamble móvil determinado es en exceso de una primera velocidad de umbral basado en la velocidad del ensamble móvil ,i, ^1»·— ι·ιι·ιι _ i - i i —i—τ-τηττ rrr- -'· estimada. j 75 ~í /' inst:. líí ' . ;
Independent claims28
360 paragraphs in 24 sections, as filed
(54) Title: MATERIALS HANDLING VEHICLE THAT ESTIMATES A SPEED OF A MOBILE ASSEMBLY FROM A SPEED OF ELEVATOR MOTOR.
(54) Title: MATERIALS HANDLING VEHICLE ESTIMATING A SPEED OF A MOVABLE ASSEMBLY FROM A LIFT MOTOR SPEED.
(57) Summary
A material handling vehicle (100) is provided comprising: a support structure including a fixed member (200); a movable assembly coupled to the support structure (300); a hydraulic system (401); and a control system (1500). The support structure further comprises a lifting apparatus (400) for effecting movement of the movable assembly relative to the fixed support structure member. The lifting apparatus includes at least one piston / cylinder assembly. The hydraulic system includes an engine (301), a pump (302) coupled to the engine to supply a pressurized fluid for at least one piston / cylinder assembly, and at least one electronically controlled valve (420) associated with at least one piston / cylinder. The control structure can estimate a speed of the moving assembly from an engine speed and control the operation of at least one valve using the estimated speed of the moving assembly.
(57) Abstract
A materials handling vehicle (100) is provided comprising: a support structure including a fixed member (200); a movable assembly coupled to the support structure (300); a hydraulic system (401); and a control system (1500). The support structure further comprises lift apparatus (400) to effect movement of the movable assembly relative to the support structure fixed member. The lift apparatus ineludes at least one ram / cylinder assembly. The hydraulic system ineludes a motor (301), a pump (302) coupled to the motor to supply a pressurized fluid to the at least one ram / cylinder assembly, and at least one electronically controlled valve (420) associated with the at least one ram / cylinder assembly. The control structure may estimate a speed of the movable assembly from a speed of the motor and control the operation of the at least one valve using the estimated movable assembly speed.
_I KNOW_
SECRfWKU M ICWOMÍA
Headlines):
Home:
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Inventor (s):
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«I-« '-
Institute
Mexican Property
Industrial
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PATENT TITLE NO. 337622
CROWN EQUIPMENT CORPORATION
A Corporation of the State of Ohio, 40 South Washington Street, New Bremen, Ohio, 45869, USA
MATERIALS HANDLING VEHICLE ESTIMATING A SPEED OF A MOBILE ASSEMBLY FROM A LIFT MOTOR SPEED.
lnt.CI.8: B66F17 / 00: B66F9 / 22
KARL L. DAMMEYER; ERIC D HOLBRÓOK; DARRIN R. IHLE; MARC A. MCCLAIN; LUCAS B. WALTZ
REQUEST
<td>Numbers.</td><td>i</td><td colspan="2">International filing date:</td>
<td>MX / a / 2013/008523 to</td><td></td><td colspan="2">February 13, 2012</td>
<td>I I</td><td> 0</td><td>PRIORITY</td><td> £ £</td>
<td>llllllllBBOi</td><td>s</td><td>Date:</td><td>t * Number:</td>
<td>US</td><td></td><td>February 16, 2011</td><td> 61/443,302</td>
<td>US</td><td></td><td>November 16, 2011</td><td> 61/560,480</td>
<td>Validity: Twenty years</td><td></td><td></td><td></td>
Expiration Date ^ »: 13
The reference patent is granted cc · funda mentí
In accordance with article 23 d * Law of the counted from the date of presentation of the sole rights.
out of 2032
one*. 2 * fraction v 6th fraction III, and 59 of the Property Law
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idustrial.
This patent is valid for twenty years and it is subject to the payment of the fee to keep it creditable, before the
The person who subscribes to this title lace it based on the provisions of articles 6 sections III and 7 bis 2 of the Law of / 05/1999, traction V subsection a), 4 and 12 sections I and III of the Regulation of the Mexican Institute of Industrial Property (DOF 12/14/1999, amended on 07/01/2002, 07/15/2004, 07/28/2004 and 09/07/2007); Articles 1, 3, 4, 5, section V, Section a), 16 sections I and III and 30 of the Organic Statute of the Mexican Institute of Industrial Property (DOF) 12/27/1999, amended on 10/10/2002, 07/29/2004, 08/04/2004 and 09/13/2007); 1, 3 and 5 paragraph a) of the Agreement that delegates powers to the Deputy Directors General Coordinator, Divisional Directors, Holders of Regional Offices, Divisional Deputy Directors, Departmental Coordinators and other subordinates of the Mexican Institute of Industrial Property. (DOF 12/15/1999, amended on 02/04/2000, 07/29/2004, 08/04/2004 and 09/13/2007).
/01/2006,
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Issue Date: March 11, 2016
THE DIVISIONAL DIRECTOR OF PATENTS
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NAHANNY CANAL REYES
Sand! No. 550, Floor 1,; oi. Puebio Santa María Tepspsn,
Xochímiico, CP 16020,
Mexico City
Tea!. (55) 53 34 07 00 www impi gob.mx
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MX / 2016/21354
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MATERIALS HANDLING VEHICLE QU
SPEED OF A MOBILE ASSEMBLY A
ELEVATOR MOTOR SPEED
PREVIOUS TECHNIQUE
US Patent No. 7,344,000 B2 describes a material handling vehicle comprising a base, such as a power unit, and a cart assembly, such as a platform assembly, where the cart assembly can be moved with relation to the base. The vehicle further comprises a cylinder coupled to the base to effect movement of the carriage assembly relative to the base and a hydraulic system to supply a pressurized fluid to the cylinder. The hydraulic system includes an electronically controlled valve attached to the cylinder. The vehicle further comprises a control structure for controlling valve operation such that the valve closes in the event of an accidental lowering of the car assembly in excess of an ordered speed.
DESCRIPTION OF THE INVENTION
In accordance with a first aspect of the present invention, a material handling vehicle is provided comprising: a support structure including a fixed member; an assembly
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MEXICAN INSTITUTE OE THE PROPERTY
INDUSTRIAL
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mobile coupled to the support structure; a hydraulic system; and a control system. The support structure further comprises a lifting apparatus for effecting movement of the movable assembly relative to the fixed member of the support structure. The lifting apparatus includes at least one piston / cylinder assembly. The hydraulic system includes a motor, a pump coupled to the motor to supply a pressurized fluid to at least one piston / cylinder assembly, and at least one electronically controlled valve associated with at least one piston / cylinder assembly. The control structure can estimate a moving assembly speed from an engine speed and control the operation of at least one valve using the estimated moving assembly speed.
The control structure is capable of energizing at least one valve to open at least one valve to allow the movable assembly to descend in a controlled manner to a desired position relative to the fixed member of the support structure.
The control structure may de-energize at least one valve in response to at least one operator-generated command to stop further lowering of the movable assembly relative to the fixed support structure member.
At least one valve can function as a check valve when de-energized so as to block pressurized fluid from flowing out of at least one piston / cylinder assembly, and allowing pressurized fluid to flow in at
<img file="MX337622B_D0013.tif" />
<img file="MX337622B_D0014.tif" />
minus one piston / cylinder assembly for ^ -a<sup>1</sup> Moving assembly lifting operation.
The at least one valve may comprise a proportional, normally closed, solenoid operated valve.
At least one valve can be placed in a base of at least one piston / cylinder assembly.
The support structure may further comprise a power unit and the fixed support structure member may comprise a first mast weld fixedly coupled to the power unit. The lifting apparatus may comprise: a second mast weld that can move relative to the first mast weld and a third mast weld that can move relative to the first and second mast welds. The at least one piston / cylinder assembly may comprise: at least a first piston / cylinder assembly coupled between the first and second mast welds to effect movement of the second and third mast welds relative to the first weld mast and a second piston / cylinder assembly coupled between the third mast weld and the movable assembly to effect movement of the movable assembly relative to the third mast weld. At least one electronically controlled valve may comprise: at least a first proportional, normally closed, solenoid operated valve associated with at least a first piston / cylinder assembly, and a second solenoid operated valve,
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normally closed, proportionally associated with the piston / cylinder assembly.
The control structure may comprise: an encoder apparatus associated with the moving assembly to generate encoder pulses as the moving assembly moves relative to the first mast weld, and a controller coupled to the encoder apparatus and the first and second valves to receive the encoder pulses generated by the encoding apparatus and determine a determined moving assembly rate based on the encoder pulses.
The control structure can control the operation of at least a first valve and the second valve by comparing the determined moving assembly speed with at least one of the first threshold speed based on the estimated first moving assembly speed and a second speed of fixed threshold.
The controller may operate to de-link the first and second valves by causing them to move from their energized open state to their closed state in the event that the moving assembly moves downward at the determined moving assembly speed exceeding one of the first and second speeds. threshold.
The controller can slowly close the first and second valves in the event the moving assembly moves downward at a speed in excess of the first or second threshold speed.
The controller may cause the first and second
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Valves move from their open and necked position to a closed clone over a period of time from about 0.3 seconds to about 1.0 seconds.
The control structure can estimate the speed of the moving assembly from the motor speed by: converting the motor speed to a pump fluid flow rate, converting the pump fluid flow rate to a piston speed, and convert piston velocity to estimated moving assembly velocity.
The control structure can use an estimated moving assembly speed and a determined moving assembly speed to generate updated pump volumetric efficiency and use the updated pump volumetric efficiency when calculating a subsequent estimated mobile assembly speed.
The control structure can be configured to measure an electric current flow in and out of the hydraulic system motor and to reduce an operating speed of the hydraulic system motor if the electric current flow in and out of the hydraulic system motor is greater than or equal to a predetermined threshold value.
The control structure can be configured to verify a pressure of the pressurized fluid and to implement a response routine that comprises controlling at least one valve to control the descent of the support structure if the pressure
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Verified falls below a pressure of unibi aI: ——---- The threshold pressure may depend on at least one of a maximum lifting height of the moving assembly and a weight of a load supported by the support structure.
In accordance with a second aspect of the present invention, a material handling vehicle is provided comprising: a fixed mast weld; at least one movable mast weld coupled to the fixed mast weld; a fork carriage carriage apparatus movably coupled to at least one movable mast weld; at least a first piston / cylinder assembly coupled to the fixed mast weld and at least one movable mast weld to effect movement of at least one mobile mast weld relative to the fixed mast weld; a second piston / cylinder assembly coupled to the fork carriage apparatus and at least one movable mast weld to effect movement of the fork carriage apparatus relative to at least one movable mast weld; a hydraulic system; and a control structure. The hydraulic system may include a motor, a pump coupled to the motor to supply a pressurized fluid to the first and second piston / cylinder assemblies, and at least a first electronically controlled valve and a second electronically controlled valve associated with at least a first piston / cylinder and the second piston / cylinder assembly. The control structure can estimate a fork carriage assembly speed relative to the fixed mast weld of
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an engine speed and control the operation of the first and second valves using the estimated fork carriage assembly speed.
The control structure can control the operation of the valves by comparing a determined fork carriage apparatus speed and a threshold speed based on the estimated fork carriage apparatus speed.
In accordance with a third aspect of the present invention, there is provided a material handling vehicle comprising: a support structure including a fixed member; a movable assembly coupled to the support structure; a hydraulic system and a control structure. The support structure may further comprise a lifting apparatus for effecting movement of the movable assembly relative to the fixed support structure member. The lifting apparatus may include at least one piston / cylinder assembly. The hydraulic system may include a motor, a pump coupled to the motor to supply a pressurized fluid to at least one piston / cylinder assembly, and an electronically controlled valve associated with at least one piston / cylinder assembly. The control structure can estimate a moving assembly speed from an engine speed and calculate an updated volumetric pump efficiency using the estimated moving assembly speed and a given moving assembly speed.
The control structure can determine the efficiency
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Volumetric updated using the following equation:
updated volumetric efficiency = (determined mobile assembly speed * current volumetric efficiency) / estimated mobile assembly speed.
The actual volumetric efficiency can be derived based on one or more of a material handling vehicle speed, a direction of rotation of the pump, and a pressure, temperature, and / or viscosity of the pressurized fluid.
The fixed member may comprise a first fixed mast weld coupled to a power unit.
The lifting apparatus may further comprise at least one movable mast weld and the movable assembly may comprise a fork carriage assembly that moves relative to the fixed support structure member.
In accordance with a fourth aspect of the present invention, a material handling vehicle is provided comprising: a support structure including a fixed member; a movable assembly coupled to the support structure; a hydraulic system and a control structure. The support structure may further comprise a lifting apparatus for effecting movement of the movable assembly relative to the fixed support structure member. The lifting apparatus may include at least one piston / cylinder assembly. The hydraulic system may include a motor and a pump coupled to the motor to supply a pressurized fluid to at least one piston / cylinder assembly. The control structure
<img file="MX337622B_D0020.tif" />
It can measure an electric current flow inside or outside the system. motor and reduce an operating speed of the hydraulic system motor if the electric current flow into or out of the hydraulic system motor is greater than or equal to a predetermined threshold value.
In accordance with a fifth aspect of the present invention, a material handling vehicle is provided comprising: a support structure including a fixed member; a movable assembly coupled to the support structure; and a control structure. The support structure further comprises a lifting apparatus for effecting movement of the movable assembly relative to the fixed support structure member. The lifting apparatus includes hydraulic structure comprising at least one piston / cylinder assembly, at least one hydraulic fluid line in communication with at least one piston / cylinder assembly, and a hydraulic system supplying a pressurized fluid to at least one Piston / cylinder assembly through at least one line of hydraulic fluid. The control structure verifies a hydraulic fluid pressure within a hydraulic structure and implements a response routine if the verified hydraulic fluid pressure within the hydraulic structure falls below a threshold pressure.
The threshold pressure can depend on at least a maximum lifting height of the moving assembly and a weight of a load supported by the support structure.
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The threshold pressure can be calculated, by .... Ja__following equation:
T<sub>p</sub> (kg / cm<sup>2</sup>) = [A (kg / cm<sup>2</sup>/ kg) * Load (kg)] / 100 (without unit) + [(Height (centimeters) * 100 (without unit)] / B (centimeters / kg / cm<sup>2</sup>) where T<sub>p</sub> is the threshold pressure, A is a constant, Load is the weight of a load supported on the support structure, 100 is a scale factor without unit, Height is the maximum lifting height of the moving assembly, 100 is a factor of scale without unity, and B is a constant.
The control structure can only implement the response routine if it is determined that the support structure is descending at a speed equal to or above a predetermined speed.
The response routine may comprise the controller that controls the operation of the at least one valve to control the descent of the support structure.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a top view of a material handling vehicle in which a mono-mast built in accordance with the present invention is incorporated;
Figure 2 is a front view of the vehicle illustrated in Figure 1 with a raised fork carriage apparatus;
Figure 3 is an enlarged top view of the mono-mast
<img file="MX337622B_D0022.tif" />
illustrated in Figure 1;
Figure 4 is a side view, partially in cross section, of an upper portion of the mono-mast;
Figure 5 is a perspective side view, partially in cross section, of the upper portion of the mono-mast;
Figure 6 is a side view, partially in cross section, of the mono-mast;
Figure 7 is a perspective side view illustrating the mono-mast and a portion of the fork carriage apparatus;
Figure 8 is a perspective side view illustrating the fork carriage apparatus coupled to the mono-mast illustrated in Figure 1;
Figure 9 is a schematic diagram illustrating the motor, pump, controller, electronic normally closed ON / OFF solenoid operated valve, electronic first normally closed proportional first and second solenoid operated valves, mast weld lifting structure and fork carriage apparatus lifting;
Figures 10A and 10B provide a flow chart illustrating procedural steps implemented by a controller in accordance with the present invention;
Figure 11 is test data of a vehicle built in accordance with the present invention;
Figure 12 is an exploded view of an assembly of
<img file="MX337622B_D0023.tif" />
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INÍ mast, a mast-weld-lifting structure and fork lift apparatus lifting structure of a vehicle of a second embodiment of the present invention;
Figure 13 is a schematic diagram illustrating the motor, pump, controller, electronic normally closed ON / OFF solenoid operated valve, first, second and third electronic normally closed proportional solenoid operated valves, mast weld lifting structure and fork carriage apparatus lifting structure of the vehicle of the second embodiment of the present invention; and
Figure 14 provides a flow chart illustrating procedural steps implemented in accordance with the present invention.
METHODS FOR CARRYING OUT THE INVENTION
FIG. 1 illustrates a top view of a material handling vehicle 100 comprising a driver reach truck 100. A mono-mast 200, a mast weld lifting frame 220, a fork carriage apparatus 300, and a frame fork carriage apparatus lifting weights 400, constructed in accordance with a first embodiment of the present invention, are incorporated into the driver's reach truck 100, see also Figures 3 and 9.
<img file="MX337622B_D0024.tif" />
<img file="MX337622B_D0025.tif" />
<img file="MX337622B_D0026.tif" />
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Truck 100 further includes a vehicle unit 102, see Figures 1 and 2. Power unit 102 houses a battery (not shown) to supply power to a traction motor coupled to a steerable wheel (not shown) mounted near a first Corner at rear 102A of power unit 102. Mounted to the second corner at rear 102A of power unit 102 is a caster wheel (not shown). A pair of legs 202 and 204 is mounted to a single-mast frame 210, see Figure 2. Legs 202 and 204 are provided with support wheels 202A and 204A. The battery also supplies power to a lift motor 301, which drives a hydraulic lift pump 302, see Figure 9. As will be discussed in further detail below, the lift pump 302 supplies pressurized hydraulic fluid to the fork carriage apparatus lift structure 400 and the mast weld lift structure 220. Although not illustrated, the additional motor and pump may further be provided to supply pressurized hydraulic fluid to attachment mechanisms, such as a side shift mechanism, a tilt mechanism and / or a reach mechanism.
Vehicle power unit 102 includes an operator compartment 110. An operator remaining in compartment 110 can control the direction of travel of the truck 100 through a rudder bar 120. The operator can also control the travel speed of the
<img file="MX337622B_D0027.tif" />
truck 100, and height, extension, tilt and lateral displacement of first and second forks 402 and 404 through a multi-function control 130, see Figure 1. The first and second forks 402 and 404 are part of the trolley apparatus of fork 300.
The mono-mast 200 can be constructed as described in US Patent Application Publication No. 2010/0065377 A1, entitled "Mono-Mast for a Material Handling Vehicle", filed on September 10, 2009, the disclosure of which Full is incorporated here for reference. Briefly, the mono-mast 200 comprises a first fixed-stage mast weld 230 (also referred to herein as a fixed member), a second stage-mast weld 240 positioned to fold over the first 230-stage weld and a third weld of Stage 250 mast positioned to fold over first and second stage welds 230 and 240, see Figures 1 and 3-5. The mast weld lifting structure 220 performs the lifting motion of the second and third stage welds 240 and 250 relative to the first fixed stage weld 230, see Figure 9.
The support structure is defined herein as comprising the power unit 102, the first fixed mast weld 230 and the lifting apparatus. The lifting apparatus is defined herein as comprising the second and third mast welds 240 and 250, the mast welding lifting structure 220 and the fork carriage apparatus lifting structure 400.
<img file="MX337622B_D0028.tif" />
<img file="MX337622B_D0029.tif" />
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The mast ura___ weld lifting structure 220 comprises a hydraulic piston / cylinder assembly 222 comprising a cylinder 222A and a piston 222B, see Figures 4-6. Cylinder 222A is fixedly coupled to a base 1239 that is part of the first stage weld 230, see Figure 6. Therefore, cylinder 222A does not move vertically relative to vehicle power unit 102.
A coupling plate 1300 of a pulley assembly 302 is coupled to an end portion 1222B of piston 222B, see Figure 4. Pulley assembly 302 further comprises first and second vertical plates 1310 and 1312, which are attached to the 1300 coupling through welds. A pulley or roller 314 is received between and rotatably coupled to the first and second vertical plates 1310 and 1312. The pulley assembly 302 is fixedly coupled to the second stage weld 240 by coupling the frame (not shown). First and second chains 500 and 502 are coupled to first ends (only the first end 500A of the first chain 500 is clearly illustrated in Figure 6) to chain anchors (not shown) which, in turn, are bolted to a clamp 510 fixedly welded to cylinder 222A of piston / hydraulic cylinder assembly 222, see Figure 6. The opposite second ends of the first and second chains 500 and 502 (only the second end 500B of the first chain 500 is clearly illustrated in Figure 6) are coupled to a lower section of the stage welding machine and <sup>and</sup>· / Γ Τ '>. -i É; Ζ ''<sup>1</sup> ·.“-' *>
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250 through coupling anchors 504 and 506, see Figures 2 and 6. The first and second chains 500 and 502 extend over the pulley or roller 314 of the pulley assembly 302, see Figure 4. When the piston 222B extends, it causes pulley assembly 302 to move vertically upward so that pulley 314 pushes up against first and second chains 500 and 502. As pulley 314 applies upward forces on chains 500 and 502, the second stage weld 240 moves vertically relative to the first stage weld 230 and the third stage weld 250 moves vertically relative to the first and second stage welds 230 and 240. For each unit of vertical movement of the second stage weld 240 relative to the first stage weld 230, the third stage weld 250 moves two units vertically relative to the first stage weld 230.
The fork carriage apparatus 300, also referred to herein as a movable assembly, is coupled to the third stage weld 250 in order to move vertically relative to the third stage weld 250, see Figure 7. The carriage apparatus of yoke 300 also moves vertically with the third stage weld 250 relative to the first and second stage welds 230 and 240. The fork carriage apparatus 300 comprises a fork carriage mechanism 310 to which the first and second forks 402 and 404 are mounted, see Figure 8. The fork carriage mechanism 310 is mounted to a
<img file="MX337622B_D0030.tif" />
extension bar mechanism 320 which, in turn, is mounted to a mast carriage assembly 330, see Figures 7 and 8. Mast carriage assembly 330 comprises a main unit 332 having a plurality of rollers 334 which are they receive on rails 350 formed on opposite outer side surfaces 250B and 250C of the third stage weld 250, see Figures 3 and 7. As noted above, attachment mechanisms, such as a side shift mechanism, a tilt mechanism, and / or an extension bar mechanism can be provided to laterally tilt, and / or extend the forks 402 and
404.
The fork carriage apparatus lifting structure 400 comprises a hydraulic cylinder / piston assembly 410 including a cylinder 412 and a piston 414, see Figure 7. Cylinder 412 is fixedly coupled to a side section 257D of the third weld of step 250. First and second pulleys 420 and 422 are coupled to an upper end of piston 414, see Figure 7. A lift chain 440 extends over the first pulley 420 and is coupled at a first end 440A to cylinder 412 through chain anchors and a bracket 441 welded to cylinder 412 and at its second end 440B to mast 330 carriage assembly , See Figure 7. The vertical movement of the piston 414 effects the vertical movement of the complete fork carriage apparatus 300 relative to the third stage weld 250. For each vertical movement unit of piston 414 and the first pulley 420 relative to the
<img file="MX337622B_D0031.tif" />
third stage weld 250, the fork carriage apparatus 300 moves two units vertically relative to the third stage weld 250.
Material handling vehicle 100 comprises a hydraulic system 401 comprising elevator motor 301, which drives hydraulic lift pump 302 as noted above. The elevator motor 301 comprises a speed sensor (RPM). Pump 302 supplies pressurized hydraulic fluid to hydraulic cylinder piston / assembly 222 of mast weld lifting frame 220 and hydraulic cylinder piston / cylinder assembly 410 of fork carriage apparatus 400.
Hydraulic system 401 further comprises a hydraulic fluid reservoir 402, see Figure 9, which is housed in power unit 102, and fluid hoses / lines 411A-411C coupled between pump 302 and the hydraulic cylinder / piston assembly. mast weld lifting structure 222 and the hydraulic cylinder piston / cylinder assembly of the fork carriage apparatus 410 lifting structure. Fluid lines / hoses 411A and 411B are series coupled and function as supply / return lines between pump 302 and piston / hydraulic cylinder assembly 222 of the mast weld frame. Fluid hoses / lines 411A and 411C are mated and function as supply / return lines between pump 302 and frame 410 hydraulic cylinder / piston assembly
<img file="MX337622B_D0032.tif" />
Fork Truck Appliance Lifting System .. Because the 411A fluid / line hose is directly coupled to both 411B and 411C fluid lines / hoses, all three 411A411C lines are always at substantially the same fluid pressure.
Hydraulic system 401 also comprises an electronic normally closed ON / OFF solenoid valve 420 and first and second electronic normally closed proportional solenoid valves 430 and 440. Valves 420, 430 and 440 are coupled to an electronic controller 1500 for control its operation, see Figure 9. The electronic controller 1500 is part of a "control structure". The normally closed ON / OFF solenoid valve 420 is energized by controller 1500 only when one or both of pistons 222B and 414 are to be lowered. When de-energized, solenoid valve 420 functions as a check valve to block pressurized fluid from flowing from line 411A, through pump 302, and back into tank 402, that is, it operates to prevent downward displacement of the fork carriage apparatus 300, even allows pressurized fluid to flow to cylinders 222A and 412 through lines 411A-411C during a lift operation.
The first electronic normally closed proportional solenoid operated valve 430 is located inside and directly coupled to a base 1222A of cylinder 222A of the
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Hydraulic 222 Mast Welding Lifting Structure Piston / Cylinder Assembly, see Figure 9. The second electronic normally closed proportional solenoid operated valve 440 is located inside and directly coupled to a 412A base of cylinder 412 of the piston / cylinder assembly fork carriage apparatus hydraulic lifting structure 410. The first normally closed proportional solenoid operated valve 430 is energized, ie open, by controller 1500 when piston 222B is to be lowered. The second normally closed proportional solenoid operated valve 440 is energized, ie open, by controller 1500 when piston 414 is to be lowered. When de-energized, the first and second normally closed proportional solenoid operated valves 430 and 440 function as check valves to block pressurized fluid from flowing out of cylinders 222A and 412. Valves 430 and 440, when operating as check valves They also allow pressurized hydraulic fluid to flow into cylinders 222A and 412 during a lift operation.
When an lift command is generated by an operator through the multi-function controller 130, both cylinder 412 of the fork apparatus lifting structure 400 and cylinder 222A of the mast welding lifting structure 220 are exposed to hydraulic fluid at the same pressure through lines 411A-411C. Because the piston 414 of the fork carriage apparatus lifting structure 400 and the piston 222B of the
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base ends having substantially the same cross-sectional areas and for all load conditions, the fork carriage apparatus lifting structure 400 requires less pressure to drive than the mast welding lifting structure 220, the piston 414 of the fork carriage apparatus lifting structure 400 will first move until the fork carriage apparatus 300 has reached its maximum height relative to the third stage weld 250. Thereafter, the second and third Stage welds 240 and 250 will begin to move vertically relative to the first stage weld 230.
When a descent command is generated by an operator through the multi-function controller 130, the electronic controller 1500 causes the solenoid operated valve to
ON / OFF normally closed electronic 420 open. Assuming that pistons 222B and 414 are fully extended when a lower command is generated, the first proportional valve 430 is energized by controller 1500, causing it to fully open in the illustrated mode to allow fluid to exit cylinder 222A of the structure. mast weld lifting height 220, consequently allowing the second and third stage welds 240 and 250 to descend. Once the second and third stage welds 240 and 250 are close to their lower positions, controller 1500 causes the second proportional valve 440 to
<img file="MX337622B_D0035.tif" />
open substantially completely and the first proportional valve 430 partially closes. Partially closing the first valve 430 causes the fluid pressure in lines 411A-411C to drop. Upon opening second valve 440 and partially closing first valve 430, piston 440 begins to descend, while piston 222B continues to descend. After piston 222B reaches its lowest position, piston 414 continues to descend until fork carriage apparatus 300 reaches its lower position. Except for partial closure of the first proportional valve 430 when the second and third stage welds 240 and 250 near their lower positions, the rate at which fluid is measured from cylinder 222A of the mast weld lifting structure 220 and cylinder 412 of fork carriage apparatus lifting structure 400 are generally controlled by pump 302.
First and second encoder units 600 and 602 are provided, respectively, also forming part of the "control structure", and may comprise conventional friction wheel encoder assemblies or conventional wire / cable encoder assemblies, see Figure 9. In the illustrated embodiment, the first encoder unit 600 comprises a first friction wheel encoder assembly mounted to the third stage weld 250 such that a first friction wheel engages and moves along the second weld of step 240. Therefore, as the third stage weld íU β. You '?> 7Γ! Ί
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250 moves relative to the second stage weld 240, the first friction wheel encoder generates pulses to the controller 1500 indicative of the third stage weld movement relative to the second stage weld 240.
Also in the illustrated embodiment, the second encoder unit 602 comprises a second friction wheel assembly mounted to the fork carriage apparatus 300 such that a second friction wheel engages and moves along the third stage weld 250 mast. Therefore, as the fork carriage apparatus 300 moves relative to the third stage weld 250, the second friction wheel encoder generates pulses to the controller 1500 indicative of the movement of the fork carriage apparatus 300 relative to to the third stage weld 250.
As noted above, the first and second encoder units 600 and 602 generate pulses corresponding to controller 1500. The pulses generated by first encoder unit 600 are used by controller 1500 to determine the position of the third stage weld 250 with relative to the second stage weld 250 as well as the movement speed of the third stage weld 250 relative to the second stage weld 240. Controller 1500 also determines the speed and position of the third stage weld 250 relative to the first fixed stage weld 230, where the speed of the third stage weld 250 relative to the
<img file="MX337622B_D0036.tif" />
first stage weld 230 equals twice the speed cT'He 'the third stage weld 250 relative to<sup>w</sup>Ta * ^ s "egTTnd ^ T '240 stage solder. Furthermore, the distance from a reference point on the third stage weld 250 to a reference point on the first stage weld 230 is twice the distance from the reference point on the third stage weld 240 to a point of reference on the second stage weld 230, wherein the reference point on the second stage weld 240 is at a location corresponding to the reference point location on the first stage weld 230. The pulses generated by the second encoder unit 602 are used by controller 1500 to determine the position of the fork carriage apparatus 300 relative to the third mast stage weld 250 as well as the movement speed of the fork carriage apparatus. 300 relative to third mast stage weld 250. By knowing the speed and position of the third stage weld 250 relative to the first stage weld 230 and the speed and position of the fork carriage apparatus 300 relative to the third stage weld 250, controller 1500 can easily determine the speed and position of the fork carriage apparatus 300 relative to the first stage weld 230.
In accordance with the present invention, during a descent command, controller 1500 compares a determined or detected speed of fork carriage apparatus 300 relative to the
<img file="MX337622B_D0037.tif" />
first stage weld 230 with pr? hreTay --— at threshold speeds. This involves controller 1500 determining a first speed comprising a determined or detected speed of the first stage weld 250 relative to the first stage weld 230, determining a second speed comprising a determined or detected speed of the carriage apparatus. yoke 300 relative to the third stage weld 250 and add the determined first and second speeds together to calculate a given third speed. The third determined speed is equal to the determined or detected speed of the fork carriage apparatus 300 relative to the first stage weld 230.
As noted above, for each vertical movement unit of the second stage weld 240 relative to the first stage weld 230, the third stage weld 250 moves two units vertically relative to the first stage weld 230. In order to determine the first speed, controller 1500 determines the speed of the third stage weld 250 relative to the second stage weld 240 using the pulses from the first encoder unit 600, as noted above, and multiplies the determined movement speed of the third stage weld 250 relative to the second stage weld 240 by "2". Therefore, this provides the first speed, i.e. the determined speed of the third stage weld 250 relative to the
<img file="MX337622B_D0038.tif" />
<img file="MX337622B_D0039.tif" />
first stage weld 230.
The second speed is equal to the determined speed of movement of the fork carriage apparatus 300 relative to the third mast stage weld and is found using the pulses generated by the second encoder unit 602 as noted above.
During a descent command, controller 1500 can compare the third determined speed, i.e., the determined speed of the fork carriage apparatus 300 relative to the first stage weld 230, to the first and second threshold speeds. In the illustrated embodiment, the comparison of the determined third speed with the first and second threshold speeds can be done by the controller 1500 once every predefined period of time, for example, every 5 milliseconds. Comparison of the determined third speed with the first and second threshold speeds is referred to herein as a "comparison event". If the determined third rate is greater than the first threshold rate during a predefined number of sequential comparison events, for example, between 1-50 comparison events, or greater than the second threshold rate during an individual comparison event, then the electronic controller 1500 implements a response routine, where the controller de-energizes the first and second electronic normally closed proportional solenoid valves 430 and 440 to prevent
<img file="MX337622B_D0040.tif" />
IMPI additional downward movement of pistons 222B and 414. Controller 1500 may cause the first and second valves 430 and 440 to move from their energized open positions to their closed positions immediately or for an extended period of time, such as about 0.3 seconds to about 1.0 seconds. By causing the first and second valves 430 and 440 to close for an extended period of time, the magnitude of pressure peaks within cylinders 222A and 412, which occurs when pistons 222B and 414 stop their downward movement within cylinders. 222A and 412, is reduced. Furthermore, the closing of the first and second valves 430 and 440 by the controller 1500 may comprise partially closing the first and second valves 430 and 440, that is, not completely closing the first and second valves 430 and 440, in order to allow the fork carriage apparatus 300 and the second and third stage welds 240, 250 slowly descend to the ground. It is assumed that when the third determined speed is greater than one of the first and second threshold speeds, the fork carriage apparatus 300 is moving too fast relative to the first stage weld 230, i.e. at a descending speed accidental, the condition of which can occur when there is a loss of hydraulic pressure in the fluid that is measured from one or both cylinders 222A and 412. Loss of hydraulic pressure can be caused by a rupture in one of the 411A-411C fluid lines.
<img file="MX337622B_D0041.tif" />
In an additional mode, the controller'r '' '' T5OO<sup>,</sup>'COm [ra'rcr | and third determined speed, that is, the determined speed of the fork carriage apparatus 300 relative to the first stage weld 230, only for the first threshold speed. The comparison of the third speed determined to the first threshold speed is made by the controller 1500 once every predefined period of time, for example, every 5 milliseconds. Comparison of the determined third speed with the first threshold speed is also referred to herein as a "comparison event". If the determined third speed is greater than the first threshold speed, during a predefined number of sequential comparison events, for example between 1-50 comparison events, then the electronic controller 1500 implements a response routine, wherein controller 1500 de-energizes the first and second electronic normally closed proportional solenoid valves 430 and 440 to prevent further downward movement of pistons 222B and 414.
The first threshold speed can be determined by the electronic controller 1500 as follows. First, controller 1500 can estimate the magnitude of a combined lowering speed of piston 222B of mast weld lifting structure 220 and piston 414 of lifting structure of fork carriage apparatus 400 from a speed of elevator motor 301. As discussed above regarding
<img file="MX337622B_D0042.tif" />
At a lowering operation, with the fork carriage apparatus 300 and the second and third stage welds 240 and 250 fully extended, the piston 222B begins to descend first, then the pistons 222B and 414 descend simultaneously during a stage part of lowering operation until piston 222B reaches its lowest position. After that, piston 414 continues its downward motion until it reaches its lowest position.
First, controller 1500 converts the lift motor speed to a lift pump fluid flow rate using the following equation:
pump fluid flow rate (llters / minute) = [(lift motor speed (RPM)) * (lift pump displacement (cc (revolution)) * (volumetric efficiency of lift motor)] / (3786 cc / gal)
Controller 1500 can then determine an estimated downward linear velocity (magnitude) of fork carriage apparatus 300 relative to the first stage weld 230 using the following equation, the equation is believed to be applicable during all phases of an operation of descent, including stage splitting when both pistons 222B and 414 are descending simultaneously:
estimated linear velocity of the fork carriage apparatus 300 relative to the first weld 230 (meters / seconds) = [(pump fluid flow velocity (lltros / second)) * (3.78
<img file="MX337622B_D0043.tif" />
V, * <sub>t</sub>. ϊ \ ·>
& V ¡NfTíT · 'cm<sup>3</sup>/4.54 liters) * (speed ratio)] / [area irt-teH «ox ~ deJ cylinder (cm<sup>2</sup>)) * (60 seconds / minute)] where, “cylinder interior area” = cylinder cross-sectional area 222B, which equals the cross-sectional area of cylinder 412 (only the cross-sectional area of a single cylinder is used in the equation);
"Speed ratio" = (the third welding speed / first welding speed) = (fork carriage apparatus speed / third welding speed) = 2/1 in the illustrated mode.
In the illustrated embodiment, the first threshold velocity is equal to an estimated velocity of the fork carriage apparatus 300 relative to the first weld 230 times either a first tolerance factor, eg 1.6, or a second tolerance factor for example 1.2. Once an operator provides a command through multi-function controller 130 to lower fork carriage apparatus 300, controller 1500 executes a ramp function within its software to increase the magnitude of the downward descent rate of the fork carriage apparatus 300 in a controlled manner at a predetermined speed, for example, a change in speed from approximately 1.22 meters / minute to approximately 4.88 meters / minute every 16 milliseconds, based on the position of the multi-function controller 130, until the ordered descending speed is reached. The first tolerance factor is
<img file="MX337622B_D0044.tif" />
used when the lowering speed of the fork carriage aoaratQ is in the process of rising to the commanded speed, i.e. the 1500 controller is still running the ramp function, and the second tolerance factor is used when the 1500 controller is already the speed of the elevator motor 301 is not increased, that is, the controller 1500 has completed the ramp function. The first tolerance factor is greater than the second tolerance factor to represent the physical delay time that occurs between when an operator orders a speed change and the speed of the fork carriage apparatus that actually occurs. This is also contemplated that in an alternative embodiment, the first threshold speed may be equal to the estimated speed of the fork apparatus 300 relative to the first weld 230.
Controller 1500 can use the determined downward velocity of the fork carriage apparatus relative to the first stage weld, the estimated downward velocity of the fork carriage apparatus relative to the first weld, and the volumetric efficiency of the current pump to generate an updated volumetric pump efficiency, whose updated pump volumetric efficiency can be used by controller 1500 the next time it converts the lift motor speed to a lift pump fluid flow rate. Controller 1500 can determine the updated pump volumetric efficiency using the following equation:
updated pump volumetric efficiency =
<img file="MX337622B_D0045.tif" />
<img file="MX337622B_D0046.tif" />
(fork carriage apparatus speed détéÜTrrnaHT ^^ éTTcTe ^ Tra 'volumetric current) / (fork carriage apparatus speed estimated).
An initial volumetric pump efficiency, that is, one used when controller 1500 is first activated and one applied in the equation above as “current volumetric efficiency” at the time an updated volumetric pump efficiency is calculated, for example, the first time after a decline operation is started, it can equal 95% or any other appropriate value. The initial pump volumetric efficiency can be stored in the memory associated with the 1500 controller. In accordance with another aspect of the invention, instead of using a single initial pump volumetric efficiency, multiple volumetric efficiency points corresponding to, for example, the speed of the truck 100, although other vehicle conditions, such as a hydraulic fluid pressure, hydraulic fluid temperature, hydraulic fluid viscosity, direction of rotation of the hydraulic lift pump 302, etc., they can be stored in a data or query table. The correct volumetric efficiency point based on one or more corresponding one or more of the vehicle condition (s) can be found in the data table and applied as the initial pump volumetric efficiency to calculate an updated pump volumetric efficiency. Ser observes that the use of the initial pump volumetric efficiency is not intended to be limited to use
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Λ?, F, ·<sup>!</sup>! '.j<sup>, N5T</sup>// 7 «'p -'. W V bL ι, Α I r '' · / *, fj · '* ·' CST / í.'AL only by descent operation. It is ... decjr, the initial pump volumetric efficiency can be used by generating an updated pump volumetric efficiency for various implementations of the above equation. For example, the initial pump volumetric efficiency can be used by generating an updated pump volumetric efficiency for a predefined period of time, such as, for example, the first 0.5 seconds after the start of a lowering operation.
The second threshold speed may comprise a fixed speed, such as 91.5 meters / minute. When the fork carriage apparatus 300 is moving at a speed equal to or greater than 91.5 meters / minute, it is assumed that it is moving at an unintended, excessive speed.
Referring to Figures 1 OA and 10B, a flow chart illustrates a procedure 700 implemented by controller 1500 to control the operation of the first and second electronic normally closed proportional solenoid operated valves 430 and 440 during a descent command. In step 701, when valve 100 is turned on, controller 1500 reads the nonvolatile memory (not shown) associated with controller 1500 to determine a value stored within a first "close" memory location. If, during the prior operation of vehicle 100, controller 1500 determines that a "subject count", discussed below, exceeded a "maximum subject count," eg, 40, controller 1500 will need to set
<img file="MX337622B_D0047.tif" />
<img file="MX337622B_D0048.tif" />
the value in the first memory location of cTé7ré<sup>, J</sup>T<sup>r</sup>T7 3i rre or »thus, the value in the first closing memory location will remain set to 0.
If controller 1500 determines during step 701 that the value in the first close memory location is 0, controller 1500 then determines, during step 702, whether the magnitude of the third speed determined is greater than a lower threshold speed sets, for example, 18.3 meters / minute, and yes the direction of movement of the elevator motor 301, as indicated by the speed sensor (noted above) associated with the motor 301, indicates that the fork carriage apparatus 300 is being lowered. If the answer to any of these questions is NO, then the value of “reference count is set equal to 0, see step 703, and controller 1500 returns to step 702. Step 702 can be repeated continuously once every time period. Default, for example, every 5 milliseconds. If the answer to both questions is YES, then controller 1500 determines, in step 704, whether an operator commanded a descent rate for the fork carriage apparatus 300 that is to be raised, i.e. the ramp function is running yet. If the answer is YES, then the first tolerance factor is used and the first threshold speed is equal to the estimated speed of the fork carriage apparatus 300 relative to the first weld 230 times the first tolerance factor, see step 705 If the answer is NO, then the second
<img file="MX337622B_D0049.tif" />
tolerance factor is used and the first speed of umC is equal to the estimated speed of the fork carriage apparatus 300 relative to the first weld 230 times the second tolerance factor, see step 706.
After the first threshold speed has been calculated, controller 1500 determines, during step 707, whether the third determined speed is greater than the first threshold speed. If NO, controller 1500 sets the "reference count" value to 0 and returns to step 704. If YES, then controller 1500 determines that the third speed determined exceeds the first threshold speed, controller 1500 increases the "Reference count" by "1", see step 709. In step 711, controller 1500 determines whether the "reference count" is greater than the "maximum reference count" or whether the third determined speed is greater than the second threshold speed. IF the answer to both questions is NO, then controller 1500 returns to step 704. Steps 704 and 707 can be repeated continuously once every predetermined period of time, for example, every 5 milliseconds. If the answer to one or both questions is YES, then controller 1500 implements an answer routine, where controller 1500 de-energizes the first and second electronic normally closed proportional solenoid valves 430 and 440, see step 713. How to previously noted, valves 430 and 440 can be closed for an extended period of time, for example,
<img file="MX337622B_D0050.tif" />
approximately 0.3 seconds to approximately. IJlseconds.
Once valves 430 and 440 have been closed, controller 1500 determines, based on pulses generated by encoder units 600 and 602, the height of fork carriage apparatus 300 relative to the first stage weld 430 and defines that height in nonvolatile memory as a first "reference height, see step 714. Controller 1500 also sets the value in the first close memory location to "1", see step 716, as an accidental lowering failure has occurred. As long as the value in the first close memory location is set to 1, controller 1500 will not allow valves 430 and 440 to be energized to operate to allow fork carriage apparatus 300 to descend. However, controller 1500 will allow, in response to an operator generated lift command, that a pressurized fluid be provided to cylinders 222A and 412, the fluid passing through valves 430 and
440.
If, after an unintended lowering failure occurred and in response to an operator generated command to raise fork carriage apparatus 300, one or both pistons 222A and 414 are unable to lift fork carriage apparatus 300, then the value in the first close memory location remains set to 1. On the other hand, if, in response to an operator-generated command to raise the fork carriage apparatus 300, one or both of the pistons 222A and 414 are capable of
INSTITUTE ΤΤΥτΛΤΟ VA '.' TO·-.;
Le LA Αϊ ', ΓΛ * Ε;? ΑΪΪ k. .'7 ..7 raising the fork carriage apparatus 300 above the first ^ altqrq c | e reference plus a first reset height, as indicated by the signals generated by encoder units 600 and 602, controller 1500 resets the value in first close memory location to 0, see steps 718 and 720. Thereafter, controller 1500 returns to step 702 and thus will allow valves 430 and 440 to energize so that they can be opened to allow controlled lowering of fork carriage apparatus 300. Movement of the carriage apparatus fork 300 over the first reference height plus a first reset height indicates that the hydraulic system 401 is functional. The first reset height can have a value of 0.63 cm to approximately 10.16 cm.
If the controller 1500 determines during step 701 that the value in the first close memory location is 1, the controller 1500 continuously checks the height of the fork carriage apparatus 300, via signals generated by the encoder units 600 and 602, to see if the fork carriage apparatus 300 moves over the first reference height, which was previously stored in memory, plus the first reset height, see step 718.
Figure 11 illustrates data collected during the operation of a vehicle built in accordance with the present invention. The data comprises an operator-ordered rate (as ordered through the multi-function controller 130), a
V / 7 ΊΟ ΊΓ ζΟΧ Jl ΧΌ .O k (oo •> O>
MRXICAN LNSTIPjT OF MOOD
INDUSTRIAL
OO determined third speed, i.e., a detected speed of the fork carriage apparatus 300 relative to the first stage weld 230, and a threshold speed. An estimated speed of the fork carriage apparatus 300 was determined relative to the first stage 230 weld, where the estimated speed was calculated using the lift motor speed, as discussed above. The third speed determined was compared to the operator-ordered speed every 5 milliseconds. Also, the third speed determined was compared to the threshold speed every 5 milliseconds. The threshold velocity was calculated by multiplying the estimated velocity by 1.2. During each comparison event, when the third determined speed was greater than the operator-ordered speed, an "old reference count" was increased. Also during each comparison event, when the determined third speed was greater than the threshold speed, a "new reference count" increased. When the new reference count or old reference count exceeded 50 counts, controller 1500 implements a response routine, where controller 1500 de-energizes the first and second 430 and 440 electronic normally closed proportional solenoid operated valves. As is evident from Figure 11, the comparison between the determined third speed and the threshold speed resulted in zero events where valves 430 and 440 were de-energized. However, the comparison between the third determined speed
INSTITUTO .VZXÍCANO.-ÍA
FROM THE ΡΓίΟΡίΕ.'λ * íD and the speed ordered by operator gave as rgSüttadu drrscventoe - = - where the number of old reference counts exceeded 50; therefore, controller 1500 de-energized the first and second valves 430 and 440. It is believed that the comparison of the determined third speed with the operator ordered speed was less accurate than the comparison between the determined third speed with the threshold speed. This is believed due to inherent delays that occur in the vehicle from when an operator orders a fork carriage apparatus speed change through the multi-function controller 130 and the pressurized fluid enters or exits cylinders 222A and 412.
In the illustrated embodiment, during a descent command, controller 1500 compares a given speed of fork carriage apparatus 300 relative to the first stage weld 230 at first and second threshold speeds. It is also contemplated that, during a descent command, controller 1500 can separately compare the first speed, i.e., the determined speed of the third stage weld 250 relative to the first stage weld 230, with first and second threshold speeds and separately comparing the second speed, i.e. the determined speed of the fork carriage apparatus 300 relative to the third stage weld 250, with the first and second threshold speeds. During staging, it is contemplated that reduction of the first and second threshold speeds may be required. If the first
<img file="MX337622B_D0051.tif" />
JL jLVA _íi INSTITUTO Mt.'IICAN'i) V 'DE LA ΡΚΟΡΠ-Ρ / Ό V · industrial determined speed is greater than the first νβΙοοίΉ ^ 3 ~ 9Γβ ”ΰ ?? ΤΒΤ3Τ'-“ during a predefined number of events of sequential comparisons, for example, between 1-50 of comparison events, or greater than the second threshold rate during an individual comparison event, The electronic controller 1500 can then de-energize the first and second electronic normally closed proportional solenoid valves 430 and 440. If the determined second rate is greater than the first threshold rate during a predefined number of sequential comparison events, for example between 1-50 comparison events, or greater than the second threshold rate during an individual comparison event, then The electronic controller 1500 can de-energize the first and second electronic normally closed proportional solenoid valves 430 and 440.
The first threshold speed as calculated above can be used by controller 1500 when comparing the first speed with the first threshold speed and the second speed with the first threshold speed.
Additionally, a consumed electrical current generated by elevator motor 301, i.e., an electric current flow into or out of elevator motor 301, can be verified in accordance with one aspect of the invention. The verified electrical current flow into or out of elevator motor 301 can be used to change one or more operating parameters of the
<img file="MX337622B_D0052.tif" />
'/ ñ> r «NSTITOTC MENICAS
Uc THE INDUSTRIAL PROPERTY truck 100. For example, in some conditions ^^ - Trarr4-Hwj.a, mixed with cold hydraulic fluid, there may be too much pressure drop in hydraulic system 401 to allow the elevator motor 301 drives the hydraulic lift pump 302 at a rate at which the fork carriage apparatus 300 descends at a predetermined, desired descent rate, for example, 73.2 meters / minute. Specifically, the 302 hydraulic lift pump requires minimal operating pressure to ensure that the 302 hydraulic lift pump is completely filled with hydraulic fluid, and is not rotating faster than it can be filled with hydraulic fluid, which can result in Cavitation of the hydraulic fluid resulted.
It has been determined that if the verified electric current flow into or out of the elevator motor 301 is raised above a predetermined threshold value, the minimum operating pressure of the hydraulic lift pump 302 cannot be satisfied, which may be indicative that hydraulic lift pump 302 is rotating faster than can be filled with hydraulic fluid and thus leads to cavitation of hydraulic fluid, as noted above. When this condition is detected, i.e. when the verified electric current flow into or out of the elevator motor 301 is raised above the predetermined threshold value, the speed of the elevator motor 301 is reduced until the electric current flow within and outside the elevator motor 301 it is again below the threshold value. Once
<img file="MX337622B_D0053.tif" />
As the verified electric current flow of elevator 301 drops below the threshold value, elevator motor 301 can be adjusted back to its normal operating speed. By verifying the flow of electrical current into or out of elevator motor 301 and adjusting the operating speed of elevator motor 301, cavitation of hydraulic fluid in hydraulic lift pump 302 can be prevented.
Figure 14 illustrates a flow chart for verifying the flow of electrical current into or out of elevator motor 301 and adjusting an operating parameter of truck 10 in accordance with one aspect of the invention. The steps can be carried out or implemented by controller 1500, controller 1500 can receive signals representative of the flow of electrical current into or out of elevator motor 301.
In step 800, the flow of electrical current into or out of the elevator motor 301 is verified. This step 800 can be implemented, for example, every 5 milliseconds, and can be continuously implemented during a lowering operation as described herein.
In step 802, it is determined whether the flow of electric current into or out of the elevator motor 301 is at or above a predetermined upper threshold value. In an illustrative embodiment in which the method is being used in a regenerative lowering operation, the threshold value may be 0 amps, but it may be other suitable values, or it may be a percentage of a
<img file="MX337622B_D0054.tif" />
<img file="MX337622B_D0055.tif" />
- · „U '~ - / Λ.
MEXICAN INSTITUTE OF PROPERTY
INDUSTRIAL maximum or minimum current flow d ^ ntrn n filara dal elevator motor 301.
If the flow of electric current into or out of the elevator motor 301 is determined in step 802 to be below the predetermined upper threshold value, the elevation value 301 is maintained at a normal operating speed in step 804. This cycle of Steps 800-804 are repeated during a lowering operation until the flow of electrical current into or out of the elevator motor 301 is determined to be at or above the predetermined upper threshold value.
If the flow of electric current into or out of elevator motor 301 is determined in step 802 which is at or above the value of a predetermined upper threshold, the speed of elevator motor 301 is reduced in step 806 to an operating speed reduced. Reducing the speed of the elevator motor 301 to the reduced operating speed causes a corresponding reduction in the rotational speed of the hydraulic lift pump 302. Step 806 is implemented to reduce or prevent cavitation of the hydraulic fluid in the hydraulic lift pump 302, as discussed above.
The elevator motor 301 is maintained at the reduced operating speed in step 808 until the flow of electric current into or out of the elevator motor 301 is determined to be below a predetermined lower threshold value.
After the electric current flow in or out
<img file="MX337622B_D0056.tif" />
of the elevator motor 301 falls below the predetermined lower threshold value, the speed of the elevator motor 301 increases in step 810 back to normal operating speed.
Furthermore, a pressure of the hydraulic fluid in the truck 100 can be verified and compared with a threshold pressure T<sub>P</sub> in accordance with another aspect of the invention during the implementation of lift and / or descent commands, or during other operating procedures. The verified pressure can be measured through a T transducer<sub>D</sub> (see Figure 9) or other detection structure located on the hydraulic structure inside the truck
100, that is, within a component of the hydraulic system 401 or within the cylinder 222A of the mast welding lifting structure 220 or the cylinder 412 of the lifting structure of the fork carriage apparatus 400. The transducer T<sub>D</sub> it sends a signal to controller 1500 representing the pressure measured within the hydraulic structure.
Threshold pressure T<sub>P</sub> it may comprise a variable depending on one or more parameters, such as the height of a portion of the truck 10, for example, a maximum lifting height of the moving assembly, for example, the maximum height of the upper parts of the forks 402 , 404 relative to the ground, or a maximum height of the top of the third stage mast weld 250 relative to the ground, and the height of a load 250A being carried on the forks 402, 404. In accordance with an illustrative aspect of the invention, these values, i.e. the height
<img file="MX337622B_D0057.tif" />
of the truck portion and the height of the load ^^ uT being carried on the forks 402, 404, can be used to determine the threshold pressure T<sub>P</sub> according to the following equation:
T<sub>P</sub> (kg / cm<sup>2</sup>) = [A (kg / cm<sup>2</sup>/ kg) * Load (kilograms)] / 100 (without unit) + [(Height (centimeters) * 100 (without unit)] / B (cm / kg / cm<sup>2</sup>) where T<sub>P</sub> is the threshold pressure (kg / cm<sup>2</sup>), A is a system gain defined by a numerical constant equal to 10 (kg / cm<sup>2</sup>/ kg) in the illustrated mode, Load is the weight of the load transported on the forks 402, 404 (kg), 100 is a scale factor without unit, Height is the maximum lifting height of the mobile assembly (centimeters), 100 is a unitless scale factor, and B is a system offset defined by a numerical constant equal to 600 (cm / kg / cm<sup>2</sup>) in the illustrated mode.
According to one aspect of the invention, the comparison of the verified pressure of the hydraulic fluid in the hydraulic structure with the threshold pressure T<sub>P</sub> it can be done by controller 1500, for example, when truck 10 is implementing a lowering command or a lifting command, once every predefined period of time, for example, every 5 milliseconds. If the verified pressure of the hydraulic fluid in the hydraulic structure falls below the threshold pressure T<sub>P</sub>, it may be an Indication that the hydraulic structure has lost its load retention capacity, for example, as a result of a rupture in one of the fluid lines 411A, 411C. If the verified hydraulic fluid pressure in the hydraulic frame drops below the threshold pressure, controller 1500 implements a response routine by al-deserrergi'Z'aT '·' 'the first and second normally closed proportional solenoid operated valves Electronic 430 and 444 to prevent further downward movement of pistons 222B and 414. Controller 1500 can cause the first and second valves 430 and 440 to move from their energized open positions to their closed positions immediately or for an extended period of time, such as from about 0.3 seconds to about 1.0 seconds. By causing the first and second valves 430 and 440 to close for an extended period of time, the magnitude of pressure peaks within cylinders 222A and 412, which occur when pistons 222B and
414 stop their downward movement within the cylinders
222A and 412, is reduced. Furthermore, the closing of the first and second valves 430 and 440 by the controller 1500 may comprise partially closing the first and second valves 430 and 440, i.e. not completely closing the first and second valves 430 and 440, to allow the apparatus fork carriage 300 and the second and third stage welds 240, 250 slowly descend to the ground.
In an embodiment of the invention, to avoid false displacements when the verified pressure is compared with the threshold pressure T<sub>P</sub>, the response routine is implemented only by the electronic controller 1500 if it is also determined that the fork carriage apparatus 300 is moving at a higher speed
<img file="MX337622B_D0058.tif" />
than a predetermined speed relative to the first stage weld 230, wherein the speed of the fork carriage apparatus 300 relative to the first stage weld can be determined as described herein in detail. The default speed can be greater than or equal to approximately
27.45 meters / minute.
It was observed that the comparison of the verified pressure of the hydraulic fluid in the hydraulic structure with the threshold pressure T<sub>P</sub> may be performed by controller 1500 to implement a response routine in addition to or in place of one or more of the other comparisons described herein, such as comparing the determined or detected speed of the fork carriage apparatus
300 relative to the first stage weld 230 at the first and / or second threshold speeds and / or the comparison of verified electric current flow inside or outside the elevator motor
301 with the default threshold value (current).
Furthermore, the response routines alternate to the response routines previously described here can be implemented by controller 1500 if a comparison event, for example, the comparison of the determined or detected speed of the fork carriage apparatus 300 relative to the first 230 stage welding with the first and / or second threshold speeds, comparing the verified electrical current flow into or out of the elevator motor 301 at the predetermined threshold value (current), and / or comparing the verified fluid pressure
Τ 7 ........
J.
The hydraulic system in the hydraulic structure under pressure umiira.l.XR „. would give a result that requires a response routine to be implemented. For example, controller 1500 could initially implement a step decrease in electrical current in the first and second electronic normally closed proportional solenoid valves 430 and 440 at a level at or slightly above a trip current. The shutdown current is 250 milliamps in one embodiment of the invention and is the minimum current that will effect hydraulic fluid through the valve. Controller 1500 can then increase the current to the first and second electronic normally closed proportional solenoid valves 430 and 440 in a manner similar to steps one level below a maximum ordered current. The maximum rated current is 600 milliamps in one embodiment of the invention and is the current that fully opens valves 430 and 440. Controller 1500 can then raise the current to the first and second normally proportional closed solenoid operated valves 430 and 440. down to the disconnect cover for a period of time of, for example, approximately 400 milliseconds. By causing the first and second valves 430 and 440 to close for an extended period of time, the magnitude of pressure peaks between cylinders 222A and 412, which occurs when the first and second valves 430 and 440 are closed abruptly, is reduced. . In addition, by controlling the first and second valves 430 and 440 of
<img file="MX337622B_D0059.tif" />
this way, for example, without completely closing the first - and second valves 430 and 440 abruptly, improves the response time and reduces oscillations in the fork carriage apparatus 300 that may otherwise occur as a result of a speed melt event, while allowing the fork carriage apparatus 300 and the second and third stage welds 240, 250 to decrease their descent to the ground in a controlled manner.
In accordance with a second embodiment of the present invention, there is provided a material handling vehicle comprising, for example, a vertical counter balance truck or similar vehicle, including a power unit (not shown), a mast assembly 1000 , a mast welding lifting structure 1100, a fork carriage apparatus (not shown) and a fork carriage apparatus lifting structure 1200, see Figure 12. Assembly 1100 further comprises, in the illustrated embodiment, first, second and third mast welds 1002, 1004 and 1006, see Figure 12, where the second weld 1004 is nested within the first weld 1002 and the third weld 1006 is nested within the second weld 1004. The first weld 1002 is attached to the vehicle power unit. The second or intermediate weld 1004 is capable of vertical movement relative to the first weld 1002. The third weld or interior 1006 is capable of vertical movement relative to the first and second welds 1002 and 1004.
The 1100 mast weld lifting structure comprises first and second da.-piston / ci-lift assemblies 1102 and 1104, which are attached in their cylinders 1102B and 1104B to the first weld 1002, see Figure 12. Pistons 1102A and 1104A extending from cylinders 1102B and 1104B are attached to an upper clamp 1004A of the second weld 1 004.
A first chain 1211 is attached to cylinder 1102B of the first piston / cylinder assembly 1102 and a second chain 1213 is attached to cylinder 1104B of the second piston / cylinder assembly
1104. The first chain 1211 extends on a first pulley
1004B coupled to an upper end of the second mast weld 1004 and coupled to a lower portion 1006A of the third weld 1006, see Figure 12. Second chain 1213 extends over a second pulley 1004C coupled to an upper end of the second 1004 mast weld and is also coupled to the third lower weld portion 1006A. When the pistons 1102A and 1104A of the assemblies and 1102 and 1104 are extended, the pistons 1102A and 1104A lift the second weld 1004 vertically relative to the first fixed weld 1002.
Furthermore, the first and second pulleys 1004B and 1004C attached to an upper end of the second weld 1004 apply upward forces on the chains 1211 and 1213 causing the third weld 1006 to move vertically relative to the first and second welds 1002 and 1004. For each vertical movement unit of the second weld 1004, the third weld 1006
<img file="MX337622B_D0060.tif" />
INSTITUTE
DELAF'O ΙΝ'λ.5, ______, - | ___. ~ T ~ vertically moves two units.
The fork carriage apparatus comprises a pair of forks (not shown) and a fork carriage mechanism on which the forks are mounted. The fork carriage mechanism can be reciprocally mounted directly to the third mast weld 1006. Alternatively, the fork carriage mechanism may be mounted to a reach mechanism (not shown), which is mounted to a mast carriage assembly (not shown), which is mounted for reciprocating motion to the third mast weld 1006.
The fork carriage apparatus lifting structure 1200 is coupled to the third weld 1006 and the fork carriage apparatus to effect the vertical movement of the fork carriage apparatus relative to the third weld 1006. The lifting structure 1200 includes a piston / cylinder assembly 1210 comprising a cylinder 1212 attached to the third mast weld 1006 to move vertically with the third weld 1006. A piston 1211, see Figure 13, is associated with cylinder 1212 and is capable of extending from cylinder 1212 when pressurized hydraulic fluid is provided to cylinder 1212. Third and fourth pulleys 1216 and 1218 are coupled to an upper end of piston 1211, see Figure 12. A pair of lift chains (not shown) are attached at one end to cylinder 1212, extend over third pulley 1216, and are coupled to a lower portion (not shown) of the fork carriage apparatus.
<img file="MX337622B_D0061.tif" />
When pressurized fluid is supplied to cylinder 1212, its piston 1211 extends causing pulley 1216 to move vertically relative to third weld 1006. Vertical movement of pulley 1216 causes lift chains to lift fork carriage assembly. relative to the third weld 1006.
The material handling vehicle of the second embodiment includes a hydraulic system 1300 as illustrated in Figure 13, where the elements that are the same as those illustrated in Figure 9 are denoted by the same reference numbers. Hydraulic system 1300 comprises a lift motor 301, which drives a hydraulic lift pump 302. Pump 302 supplies pressurized hydraulic fluid to the 1100 mast weld lifting frame comprising the first and second lifting gear assemblies 1102 and 1104 and the fork carriage apparatus lifting frame 1200 comprising the piston / cylinder assembly 1210.
Hydraulic system 1300 further comprises a hydraulic fluid reservoir 402, which is housed in the power unit, and fluid hoses / lines 411A-411D coupled between pump 302 and the 1100 mast weld lifting structure comprising the former and second lift piston / cylinder assemblies 1102 and 1104 and the fork carriage apparatus lift structure 1200 comprising the piston / cylinder assembly 1210. The 411A and 411B fluid lines / hoses are series coupled and operate as
INi'f<sup>1</sup> :
supply / return between pump 302 and the first 1102 mast weld frame hydraulic cylinder / plunger assembly. Hoses / fluid lines 411A and 411C are series-coupled and function as supply / return lines between pump 302 and the 1210 hydraulic cylinder / piston assembly of the fork carriage apparatus lifting structure. Fluid lines / hoses 411A and 411B are mated and function as supply / return lines between pump 302 and second hydraulic cylinder / piston assembly 1104 of the mast weld frame. Because the 411A fluid lines / hose is directly coupled to the 411B411D fluid lines / hoses, the four 411A-411C lines are always at substantially the same fluid pressure.
Hydraulic system 401 also comprises an electronic normally closed ON / OFF ON / OFF solenoid valve 420 and electronic first, second, and third proportional solenoid valves 1430, 1435, and 1440. Valves 1420, 1430, 1435, and 1440 are coupled to an electronic controller 1 500 to control its operation, see Figure 13. Electronic controller 1500 is part of a "control structure". The normally closed ON / OFF solenoid valve 420 is energized by controller 1500 only when one or more of pistons 1211, 1102A and 1104A are to be lowered. When de-energized, the 420 solenoid valve functions as a valve
<img file="MX337622B_D0062.tif" />
valve to block pressurized fluid déTTLnT ~ déStí'e-ta'fí-nea · - ·· '· 411 A, through pump 402 and back into tank 402, that is, it works to prevent downward displacement of the fork carriage apparatus even allows pressurized fluid to flow to cylinders 1212, 1102B, and 1104B through lines 411A-411D during a lift operation.
The first electronic normally closed proportional solenoid operated valve 1430 is located within and directly coupled to a base 1102C of cylinder 1102B of the first piston / hydraulic cylinder assembly 1102 of the mast weld lifting structure, see Figure 13. The second electronic normally closed proportional solenoid operated valve 1435 is located within and directly coupled to a base 1104C of cylinder 1104B of the second piston / hydraulic cylinder assembly 1104 of the mast weld lifting structure. The third electronic normally closed proportional solenoid operated valve 1140 is located within and directly coupled to a base 1212A of cylinder 1212 of piston / hydraulic cylinder assembly 1200 of carriage apparatus lifting structure. The first and second normally closed proportional solenoid operated valves 1430 and 1435 are energized, i.e. opened, by controller 1500 when pistons 1102A and 1104A are lowered. The third normally closed proportional solenoid valve 1440 is energized, i.e. open, by controller 1500 when the
<img file="MX337622B_D0063.tif" />
INSTITUTO 'DE l · * piston 1211 is going to descend. When de-energized, the first normally closed, second, third and third proportional solenoid valves 1430, 1435, and 1440 function as check valves to block pressurized fluid from flowing out of cylinders 1102B, 1104B, and 1212. Valves 1430, 1435, and 1440, when operating as check valves, also allow pressurized hydraulic fluid to flow into cylinders 1102B, 1104B, and 1212 during a lift operation.
When a lift command is generated by an operator through a multi-function controller, cylinder 1212 of fork carriage apparatus lift frame 1200 and cylinders 1102B and 1104B of mast weld lift frame 1110 they are exposed to the hydraulic fluid at the same pressure through lines 411A-411D. The piston 1211 of the fork carriage apparatus lifting structure 1200 has a base end with a cross-sectional area and each of the pistons 1102A and
1104A of the mast weld lifting structure 1100 includes a base end having a cross sectional area equal to about 1/2 of the cross sectional area of the piston 1211 of the lifting frame of the fork carriage apparatus 1200. Therefore the combined cross-sectional areas of pistons 1102A and 1104A equals the cross-sectional area of piston 1211. As a result, for all load conditions, the fork carriage apparatus lifting structure 1200 requires less pressure to drive than the welding weld lifting structure of
<img file="MX337622B_D0064.tif" />
mast 1100. As a result, the piston 1211 of the fork carriage apparatus lifting structure 1200 will first move until the fork carriage apparatus has reached its maximum height relative to the third stage weld 1006. After That, the second and third stage welds 1004 and 1006 will start to move vertically relative to the first stage weld 1002.
When a descent command is generated by an operator through the multi-function controller 130, the electronic controller 1500 causes the solenoid operated valve to
ON / OFF normally closed electronic 420 open. Assuming that pistons 1211, 1102A, and 1104A fully extend when a lower command is generated, the first and second proportional valves 1430 and 1435 are energized by controller 1500 causing them to fully open in the illustrated mode to allow fluid to flow out. of the cylinders 1102B and 1104B of the 1100 mast weld lifting structure, consequently allowing the second and third stage welds 1004 and 1006 to descend. Once the second and third stage welds 1004 and 1006 are close to their lower positions, controller 1500 causes the third proportional valve 1404 to open substantially completely and the first and second proportional valves 1430 and 1435 to partially close. Partial closure of the first and second valves 1430 and 1435 causes the
IN5TITU Γ-λ -<sup>1</sup> .
D2 L · ·.
fluid pressure on lines 411A-411D decTerid "a ™ ÁT 'áB" nrIT third valve 1440 and as the first and second valves 1430 and 1435 partially close, piston 1211 begins to descend, while pistons 1102A and 1104A continue to descend. After each of the pins 1102A and 1104A reaches their lowest position, piston 1211 continues to descend until the fork carriage apparatus reaches its lowest position.
First and second encoder units 600 and 602 are provided, respectfully, also being part of the "control structure", and may comprise conventional friction wheel encoder assemblies or conventional wire / cable encoder assemblies, see Figure 13. In the illustrated embodiment, the first encoder unit 600 comprises a first friction wheel encoder assembly mounted to the third stage weld 1600 such that the first friction wheel engages and moves along the second weld of step 1004. Therefore, as the third stage weld 1006 moves relative to the second stage weld 1004, the first friction wheel encoder generates pulses for the controller 1500 indicative of the third stage weld move relative to the second stage weld.
Also in the illustrated embodiment, the second encoder unit 602 comprises a second friction wheel assembly mounted to the fork carriage apparatus such that a
<img file="MX337622B_D0065.tif" />
second friction wheel engages and moves9 - ^ "í &" teígs --- 4e-U ~ third mast stage weld 1006. Therefore, as the fork carriage apparatus moves relative to the third Stage weld 1006, the second friction wheel encoder generates pulses to controller 1500 indicative of fork carriage apparatus movement relative to the third stage weld 1 006.
As noted above, the first and second encoder units 600 and 602 generate pulses corresponding to controller 1500. The pulses generated by first encoder unit 600 are used by controller 1500 to determine the position of the third stage weld 1600 with relative to the second stage weld 1004 as well as the movement speed of the third stage weld 1006 relative to the second stage weld 1004. Using this information, controller 1500 determines the speed and position of the third stage weld 1006 relative to the first fixed stage weld 1002. The pulses generated by the second encoder unit 602 are used by controller 1,500 to determine the position of the fork carriage apparatus relative to the third mast stage weld 1006 as well as the movement speed of the fork carriage apparatus. relative to third mast stage weld 1006. Knowing the speed and position of the third stage weld 1006 relative to the first stage weld 1002 and the speed and position of the
Η fork carriage apparatus relative to I stage 1006, controller 1500 can easily determine the speed and position of the fork carriage apparatus relative to the first stage weld 1002.
In accordance with the present invention, during a descent command, controller 1500 compares a determined or sensed speed of the fork carriage apparatus relative to the first stage weld 230 with first and second threshold speeds. This involves controller 1500 determining a first speed comprising a determined or detected speed of the third stage weld 1006 relative to the first stage weld 1002, determining a second speed comprising a determined or detected speed of the carriage apparatus of yoke relative to the third stage weld 1006 and add the determined first and second speeds together to calculate a given third speed. The third determined speed is equal to the determined or detected speed of the fork carriage apparatus relative to the first stage weld 1002.
As noted above, for each vertical movement unit of the second stage weld 1004 relative to the first stage weld 1002, the third stage weld 1006 moves two units vertically relative to the first stage weld 1002. With the In order to determine the first speed, the controller 1500 determines the speed of the third
I ITT insv; ·; . . · L · ·.
stage weld 1006 relative to the s ^ gun-da-'S-oidad-ura-uie ^^ stage 1004 using the pulses of the first encoder unit 600, as noted above, and multiplies the determined movement speed of the third stage weld 1006 relative to the second stage weld 1004 by "2". Therefore, this provides the first speed, that is, the speed of the third stage weld 1006 relative to the first stage weld 1002.
The second speed is equal to the determined movement speed of the fork carriage apparatus relative to the third mast stage weld found using the pulses generated by the second encoder unit 602 as noted above.
During a descent command, controller 1500 can compare the determined third speed, i.e., the determined speed of the fork carriage apparatus relative to the first stage weld 1002, with the first and second threshold speeds. In the illustrated embodiment, the comparison of the determined third speed with the first and second threshold speeds can be done by the controller 1500 once every predefined period of time, for example, every 5 milliseconds. Comparison of the determined third speed with the first and second threshold speeds is referred to herein as a "comparison event". If the determined third speed is greater than the first threshold speed during a
ϊ.
τ
<img file="MX337622B_D0066.tif" />
<img file="MX337622B_D0067.tif" />
predefined number of sequential comparison events, for example between 1-50 comparison events, or greater than the second threshold rate during an Individual comparison event, then the electronic controller 1500 implements a response routine, where the controller 1500 de-energizes the first, second and third 1430 electronic normally closed proportional solenoid operated valves, 1435 and 1440 to prevent further downward movement of pistons 1102A, 1104A, and 1211. Controller 1500 may cause the first, second, and third valves 1430, 1435, and 1440 to move from their energized open positions to their closed positions immediately or during an extended period of time, such as from about 0.3 seconds to about 1.0 seconds. Furthermore, as discussed above, valves 1430, 1435, and 1440 could only be partially closed to allow the fork carriage apparatus and second and third stage welds 1004, 1006 to drop slowly to the ground. It is assumed that when the third determined speed is greater than one of the first and second threshold speeds, the fork carriage apparatus is moving too fast relative to the first stage weld 1002, i.e., a lowering speed is not Intended, the condition may occur when there is a loss of hydraulic pressure in the fluid that is measured from one of the cylinders 1102B, 1104B, and 1212. The loss of hydraulic pressure can be caused by a rupture in one of the lines of
<img file="MX337622B_D0068.tif" />
; ν3τιπ '; ··
PE LA Ι ί:,. Fluid 41 1A-411D.
The first threshold speed can be determined by the electronic controller 1500 as follows. First, controller 1500 can estimate a combined speed of pistons 1102A, 1104A of the mast weld lifting structure 1100 and piston 1211 of the lifting structure of the fork carriage apparatus 1200 from a motor speed of elevator 301. As discussed above, regarding a lowering operation with the fork carriage apparatus and the second and third stage welds 1004 and 1006 fully extended, the pistons 1102A and 1104A begin to descend first, then the pistons 1102A, 1104A and 1211 descend simultaneously during a staged part of the descent operation until the pistons 1102A and 1104A reach their lowest position. After that, piston 1211 continues its downward motion until it reaches its lowest position.
First, controller 1500 converts the lift motor speed to a lift pump fluid flow rate using the following equation:
pump fluid flow rate (liters / minute) = [(lift motor speed (RPM)) * (lift pump displacement (cc / revolution)) * (volumetric lift motor efficiency)] / 3786 cc /4.54 liters).
Controller 1500 can then determine a speed
<img file="MX337622B_D0069.tif" />
: ν; λ, υ · ..... s estimated linear of the fork carriage apparatus — Ge ^ -relaG + ÓH-the first stage weld 1002 using the following equation, the equation is believed to be applicable during all phases of a lowering operation, including staging when pistons 1102A and 1104A and piston 1211 are simultaneously descending:
estimated linear speed of the fork carriage apparatus relative to the first weld 1002 (meters / seconds) = [pump fluid flow rate (liters / minute)) * (3.78 liters / 4.54 liters) * (speed ratio) ] [(inner area of cylinder (cm<sup>2</sup>)) * (60 seconds / minute)] where, “cylinder interior area” = sum of cylinder cross areas 1102B and 1104B = cylinder cross area 1212 (only the sum of cylinder cross areas 1102B and
1104B or only the cross-sectional area of cylinder 1212 is used in the equation);
"Speed ratio" = (the third welding speed / first welding speed) = (fork carriage apparatus speed / third welding speed) = 2/1 in the illustrated mode.
In the illustrated embodiment, the first threshold velocity is equal to the estimated velocity of the fork carriage apparatus relative to the first weld 1002 times either a first tolerance factor, for example 1.6, or a second tolerance factor,
<img file="MX337622B_D0070.tif" />
: ns7.;:: Zz I. · for example, 1.2. As previously observed with re_sjB¡ectg „jL.lSL mode illustrated in Figure 9, the first tolerance factor is used when the fork lowering speed is in the process of raising to the commanded speed, i.e. the 1500 controller is still is running a ramp function, and the second tolerance factor is used when controller 1500 is no longer increasing the speed of elevator motor 301, i.e. Controller 1500 has completed the ramp function.
As noted above, controller 1500 can use the determined downward velocity of the fork carriage apparatus relative to the first stage weld, the estimated downward velocity of the fork carriage apparatus relative to the first weld, and the volumetric efficiency of current pump to generate an updated pump volumetric efficiency, the updated volumetric pump efficiency can be used by the 1500 controller the next time you convert the lift motor speed to a lift pump fluid flow rate. Or, as noted above, the controller 1500 may use the initial pump volumetric efficiency, i.e., a predefined stored initial pump volumetric efficiency or an appropriate volumetric efficiency point corresponding to one or more vehicle conditions, for example, speed, hydraulic fluid pressure, temperature, and / or viscosity, direction of rotation of the hydraulic lift pump 302, etc., i.e. stored in a data or query table,
<img file="MX337622B_D0071.tif" />
the next time you convert the de-motor speed di? Novice in a lift pump fluid flow rate.
The second threshold speed may comprise a fixed speed, such as 91.5 meters / minute.
Procedure 700 described in Figures 10A and 10B may use controller 1500 to control the operation of electronic first normally closed proportional first, second, and third valves 1430, 1435, and 1440 during a descent command, with the following modifications that are made to the procedure.
In step 711, controller 1500 determines whether the "reference count" is greater than the "maximum reference count" or whether the third determined speed is greater than the second threshold speed. If the answer to one or both questions is YES, then controller 1500 implements an answer routine, where controller 1500 de-energizes the first, second, and third electronic normally closed proportional solenoid valves 1430, 1435, and 1440.
Once valves 1430, 1435, and 1440 have been closed, controller 1500 determines, based on pulses generated by encoder units 600 and 602, the height of the fork carriage apparatus relative to the first stage weld 1002 and defines that height in a nonvolatile memory as a first "reference height", see step 714. Controller 1500 also sets the value in the first close memory location to "1", see step
T, &
INSTITUTE OF THE
716, as an accicLenAai descent failure occurred .. As long as the value in the first close memory location is set to 1, controller 1500 will not allow valves 1430, 1435, and 1440 to energize so that open to allow lowering of the fork carriage apparatus. However, controller 1500 will allow, in response to an operator generated lift command, that the pressurized fluid be provided to cylinders 1102B, 1104B, and 1112, where fluid passes behind valves 1430, 1435, and 1440.
If, after an accidental lowering failure has occurred and a response to an operator-generated command to raise the fork carriage apparatus has occurred, one or more of the pistons 1102A, 1104A and 1211 are unable to lift the fork carriage apparatus, then the value in the first close memory location remains set to 1. On the other hand, if, in response to an operator-generated command to raise the fork carriage apparatus, one or more of the pistons 1102A, 1104A, and 1211 are capable of raising the fork carriage apparatus over the first reference height plus a first reset height, as indicated by the signals generated by encoder units 600 and 602, controller 1500 resets the value in the first close memory location to 0, see steps 718 and 720. After that, controller 1500 returns to step 702 and will therefore allow valves 1430, 1435, and 1440 to energize so that they can be opened to allow for controlled lowering of the
<img file="MX337622B_D0072.tif" />
fork carriage. Movement of the ap ^ a4e-d ^ o «^ e ~ d« ““ fork over the first reference height plus a first reset height indicates that the 1300 hydraulic system is functional.
If controller 1500 determines during step 701 that the value in the first close memory location is 1, controller 1500 continuously checks the height of the fork carriage apparatus, via signals generated by encoder units 600 and 602 , to see if the fork carriage apparatus moves over the first reference height plus the first reset height, see step 718.
It is further contemplated that the mono-mast 200 illustrated in Figure 1 may comprise only a first fixed-mast weld and a second movable-mast weld, and the mast assembly 1000 illustrated in Figure 12 may include only a first mast weld fixed and a second mobile mast weld.
Although particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. Therefore it is intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
<img file="MX337622B_D0073.tif" />
Contents24
88 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14 Sheet 15 Sheet 16 Sheet 17 Sheet 18 Sheet 19 Sheet 20 Sheet 21 Sheet 22 Sheet 23 Sheet 24 Sheet 25 Sheet 26 Sheet 27 Sheet 28 Sheet 29 Sheet 30 Sheet 31 Sheet 32 Sheet 33 Sheet 34 Sheet 35 Sheet 36 Sheet 37 Sheet 38 Sheet 39 Sheet 40 Sheet 41 Sheet 42 Sheet 43 Sheet 44 Sheet 45 Sheet 46 Sheet 47 Sheet 48 Sheet 49 Sheet 50 Sheet 51 Sheet 52 Sheet 53 Sheet 54 Sheet 55 Sheet 56 Sheet 57 Sheet 58 Sheet 59 Sheet 60 Sheet 61 Sheet 62 Sheet 63 Sheet 64 Sheet 65 Sheet 66 Sheet 67 Sheet 68 Sheet 69 Sheet 70 Sheet 71 Sheet 72 Sheet 73 Sheet 74 Sheet 75 Sheet 76 Sheet 77 Sheet 78 Sheet 79 Sheet 80 Sheet 81 Sheet 82 Sheet 83 Sheet 84 Sheet 85 Sheet 86 Sheet 87 Sheet 88
51 members in 10 offices
Priority claims14
| Document | Office | Kind | Date |
|---|---|---|---|
| 201161443302 | United States of America | P | |
| 201161443302 | United States of America | P | |
| 61443302 | United States of America | – | |
| 201161560480 | United States of America | P | |
| 201161560480 | United States of America | P | |
| 61560480 | United States of America | – | |
| 2012024838 | United States of America | W | |
| 2012024838 | United States of America | W | |
| 61443302 | – | – | – |
| 61560480 | – | – | – |
| US1224838 | – | – | – |
| US201161443302P | – | – | – |
| US201161560480P | – | – | – |
| WO2012US24838 | – | – | – |
Members51
| Document | Office | Kind | |
|---|---|---|---|
| US2012209478A1 | United States of America | A1 | |
| CA2826440A1 | Canada | A1 | |
| CA3001155A1 | Canada | A1 | |
| CA3001159A1 | Canada | A1 | |
| CA3001203A1 | Canada | A1 | |
| WO2012112431A1 | World Intellectual Property Organization (WIPO) | A1 | |
| AU2012217996A1 | Australia | A1 | |
| WO2012112431A8 | World Intellectual Property Organization (WIPO) | A8 | |
| AU2012217996A8 | Australia | A8 | |
| CN103380074A | China | A | |
| MX2013009523A | Mexico | A | |
| EP2675745A1 | European Patent Office (EPO) | A1 | |
| KR20140005285A | Republic of Korea | A | |
| US2014326541A1 | United States of America | A1 | |
| US2014326542A1 | United States of America | A1 | |
| US2014330488A1 | United States of America | A1 | |
| US8924103B2 | United States of America | B2 | |
| US8935058B2 | United States of America | B2 | |
| RU2013137976A | Russian Federation | A | |
| EP2865635A2 | European Patent Office (EPO) | A2 | |
| EP2865635A3 | European Patent Office (EPO) | A3 | |
| EP2894122A1 | European Patent Office (EPO) | A1 | |
| EP2894123A1 | European Patent Office (EPO) | A1 | |
| US2015344278A1 | United States of America | A1 | |
| MX337622BThis record | Mexico | B | |
| US9296598B2 | United States of America | B2 | |
| EP2675745B1 | European Patent Office (EPO) | B1 | |
| US9394151B2 | United States of America | B2 | |
| AU2012217996B2 | Australia | B2 | |
| AU2016225901A1 | Australia | A1 | |
| AU2016225902A1 | Australia | A1 | |
| AU2016225907A1 | Australia | A1 | |
| BR112013020758A2 | Brazil | A2 | |
| CN103380074B | China | B | |
| EP2865635B1 | European Patent Office (EPO) | B1 | |
| RU2615838C2 | Russian Federation | C2 | |
| US9751740B2 | United States of America | B2 | |
| AU2016225901B2 | Australia | B2 | |
| AU2016225902B2 | Australia | B2 | |
| AU2016225907B2 | Australia | B2 | |
| MX353719B | Mexico | B | |
| KR101914467B1 | Republic of Korea | B1 | |
| EP2894123B1 | European Patent Office (EPO) | B1 | |
| RU2016136704A | Russian Federation | A | |
| RU2016136705A | Russian Federation | A | |
| RU2016136706A | Russian Federation | A | |
| EP2894122B1 | European Patent Office (EPO) | B1 | |
| CA2826440C | Canada | C | |
| CA3001155C | Canada | C | |
| CA3001159C | Canada | C | |
| CA3001203C | Canada | C |
1 legal event, as the office reported them to INPADOC
Events
| Event | Code | |
|---|---|---|
| Grant or registrationFG | FG |
Numbers
- Publication
- 337622
- Publication, DOCDB
- 337622
- Publication, EPODOC
- MX337622
- Application
- 2013009523
- Application, DOCDB
- 2013009523
- Application, EPODOC
- MX20130009523
Titles
- Spanish
- VEHICULO DE MANEJO DE MATERIALES QUE ESTIMA UNA VELOCIDAD DE UN ENSAMBLE MOVIL A PARTIR DE UNA VELOCIDAD DE MOTOR DE ASCENSOR.
Classification
- CPC, 9
- B66F9/22
- B66F9/24
- B66F17/003
- B66F17/00
- B66F9/07
- B66F9/08
- B66F9/087
- B66F9/20
- B66F9/205
- IPC, 2
- B66F9 22
- B66F17 00