Improved piston and driver

'TITLE OF THE INVENTION' IMPROVED PUMP AND DRIVER CONSTRUCTION '

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An improved piston and guide structure comprises a synthetic piston body, a piston interlocking piece and a guide mounted within the interlocking piece through a pin and through a frictional connection of the guide to the interlocking piece of the piston when the piston is inserted into the piston. . The piston insert piece is enlarged upper to disperse operating pressures over its body. piston.

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improved.capacity.and driver's manual.

This invention relates to pistons for their use in connector devices and more particularly to composite pistons and guides for their use in connector devices.

In connector applications, such as wood clamps and studs, it is known as a sequential supply of clamps to a drive station under a piston and its associated guide, so that when the air pressure, for For example, it is applied over the plunger, it moves so as to drive the guide onto the clamp and thereby directs the clamp into and through the appropriate materials. Such a clamp applicator is disclosed, for example, in United States Patent No. 3,170, 487.

Conventional clamp applicators- Operate at pressures from 70 PSI to about 120 PSI, and larger units of large units produce a work of 45 to 50 foot, for example, for clamp application. In such devices, the piston and driver unit are subject to high forces and high voltages especially in the connection of the piston to the driver. First, the air pressure is momentarily applied to the plunger, overcoming the inertia of the stationary plunger and guide, and drives them downward into a clamp. Its customization

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- 3 clamp and the following movement exerts a tension on the driver and the driver is transferred to the piston via the driver. Also, when the piston reaches the lower part of its travel, a rubber stopper is used which abruptly stops the piston while the forward one inertia generates stresses on the piston / driver connection to the opposite direction before the piston rises for the next run. .

Occasionally, a clamping apparatus is incandescent, or when operating without moving a clamp, such as when the apparatus is being tested, or when the clamps are terminated when they are provided. In this case, the piston strikes the rubber stopper at the end of its stroke with an even higher pitch. forces, impacts the piston and the driver, strains the components and creates stresses particularly on the connection of the piston to the driver. Consequently, these normal operating stresses and actions applied to the piston and its associated driver exert operating forces which over a period of time can obviously lead to the piston or driver breaking.

In particular, it is customary to attach the driver, such as a guide blade, directly to the piston. The driver is surrounded by a navel extending from the piston, and the guide blade is attached thereto and a pin is inserted through the driver's navel. . It is the area of ​​connection of the driver blade to the plunger near the pin where common fractures occurred, as a result of these operating stresses. described above.

Accordingly, it is an object of this invention to provide a combination of improved piston and guide construction.

* An additional objective of the invention is to provide an improved piston to the connected driver which minimizes or disrupts operating forces and extends the life of the piston and driver.

* As shown above, the plunger and guide in a clamp air apparatus are accelerated to a desired speed in order to drive the clamp into the material. For. any material and clamp length a certain speed is required to ensure proper movement of the clamp at the appropriate depth. Therefore, it will be appreciated that if the piston weight and the driver can be reduced, the energy required to overcome the inertia when the piston and driver are stationary is not so great, and less energy can be used to achieve the same. or higher speeds.

Accordingly, another object of the present invention is to reduce the weight of a piston and guide assembly by the use of a. to manufacture an improved piston and driver, thereby reducing the. .

- 5 power required to operate the device for a given use.

For these purposes, a preferred embodiment of the invention contemplates the use of a synthetic piston body, a piston insert piece and a guide fixed to the piston body by means of the insert piece. The driver is mounted in a manner that disperses operating stresses to larger surfaces than to the immediate environment of the driver / piston pin.

In more detail, the body of the piston comprises a round piston having a hole that passes through the center of the piston. A lower region of the hole is threaded * while the upper region of the hole is conical open upwards and outwardly from the piston. The upper part of the piston body comprises a surface having a relief region, preferably concentric with said hole.

The piston insert piece comprises a male threaded portion at the bottom, and the upwardly extending portion is in the form of a frusto cone having a surface that is smaller than the diameter of the adjacent portion having the thread. The insertion piece comprises a curved outlet of a larger diameter than the fractured cone portion. An elongated hole extends through the threaded portion and into the portion of the fractured cone whose end terminates near the curved outward plug. * A guide, or

- 6 a flat guide blade, having the upper portion shaped similarly to the cross-section, passes through the piston insert and is secured to the piston insert by means of a pin extending through the thoracic segment a piston insert piece and the upper portion of the guide blade. The top of the blade rests on the rest of the hole in the adjacent curvature. . outwardly of the plug of the insert.

It is preferable, at a minimum, that the threaded portion of the piston body be slightly smaller than the male threaded portion of the piston insert. Therefore, when the piston insert piece is screwed into the body of the piston, the insert piece is pressed inwardly on the guide blade, and serves to guide the friction connection of the guide blade and / sec to securely hold the guide blade to its insert piece. tinnitus-_;not only by the pin passing through it, but by the frictional coupling applied to the piston assembly assembly.

A preferred embodiment of the invention provides a number of advantages. In particular, the frictional connection of the insert piece with the driver blade, for example, serves to disperse any forces acting on the driver blade or the piston or insert part of the piston, on a much larger surface than that surrounding it. the pin. While the pin serves to connect the Guide to the insert piece, it does not carry all the tension exerted by one accessory relative to another, and no excessive stress is created in the area of ​​the driver which directly surrounds the pin.

Therefore, the driver's blade is held securely inside the interlock and in the piston.

The tension on the surfaces directly surrounding the pin hole in the driver blade is spread over a larger area and is relieved to reduce blade fatigue and premature fracture.

In addition, the curved outwardly closing cap located on the upper areas of the piston body 'serves to disperse the usual (smooth) functional air forceps on a substantially flat surface of the piston body, thereby staying the forces operating throughout the construction. This dispersion of forces applied to the construction of the piston and driver throughout the unit eliminates the concentrated force in any-! never a small surface of the plunger or the insert piece.

The curved outwardly stopper is preferably mounted on the respective relief surface or socket on the upper surface of the piston.

Such compression adjustment gives the end position of the insert piece relative to the position of the piston.

The plunger sealant, such as an O-ring (O-RING) can be adjusted closer to the upper end of the plunger, thus effectively reducing the volume of the chamber before firing (air energy on the plunger) and thus performance improves.

These and other advantages will be determined by the following in detail about the preferred embodiment graph and the drawings, in which:

Figure 1 is a sectional view of a conventional clamping application showing the plunger and guide of the invention.

Figure 2 is an enlargement of the intersection of the piston and the guide of Figure 1 * and

Fig. 3 is a cross-section of the piston and guide, taken from the axial lines 3-3 of Fig. 2.

Studying now the drawings, they are shown a clamp air gun or pistol 10. Such a clamp applicator, for example, may be the device of United States Patent US No 3,170,487 which in addition to the plunger and guide such as disclosed therein, has no other component of this invention. The illustration of the clamping device 10 of Fig. 1 is provided for illustrative purposes only, to show generally how a piston and a guide are used

- 9 The clamp carrier used by device 10 is not naturally shown. *

The useful, compressed fluid, - such as air, is introduced to the surface 11 above the plunger and guide of Figure 1, where the plunger and guide are accelerated in the downward direction, as shown in Figure 1 to pin a clamp as is commonly known in the art. When the impact bumper 12 arrives, the piston and guide 12 stop and then return to the upper position as shown in the figure. 1, for the next operating cycle.

* As shown in the figures, the clamp applicator and the plunger and guide device are positioned vertically as when driving a clamp downward, It is estimated that the following, described, referred to terms as "downward direction" "" End or top "or" bottom direction "is for descriptive purposes; *, and so on. ' the drive device and the plunger and guide can be turned over or horizontally positioned or in other positions.

Now presenting a description of the combination piston and guide 12, attention is drawn to Figure 2 where the piston and guide unit is shown in detail in magnification. The piston and guide 12 each have a piston body 20, a piston insert piece 21, a guide blade 22 and, a pin 23. The piston body 20 preferably comprises a disc 26 and a downwardly extending bush; 27 "* A circumferential groove 28 is constructed around the disc 26 for mounting a sealing 0-ring 29 (shown in Figure 1). only). Such a sealant acts as a piston seal to the cylinder walls of the clamp applicator.

The piston body 20 also comprises an inner passage or inner diameter of the piston or hole. comprising a conical upstream direction 56 or 56 and a portion of the threaded bore 57 that slits downwardly against the upstream direction 56. The upper part of the piston 20 also comprises a round socket 58, which its utility will be described below.

The piston insert piece 21 comprises a curved outwardly closure 40, a conical frustum conical portion extending downwardly and conical inwardly from the curved outward closure 40, and a straight threaded piece

42. The insertion piece 21 has a slit, or fork, as shown in Fig. 2, which essentially separates the insertion piece into pieces that are one with the thread and the other conical, in two semi-cylindrical or semicircular legs . Such a slit. ', or partition is indicated by the number 43.

The guide or guide blade 22 has an end 45 which substantially conforms to the cross-sectional vehicle 21, This relation is best illustrated in Fig. 5, where it will be appreciated that the upper end 45 of the blade 22 is supported by the cap 40 of the piston insert piece 21.

While piston components can be made of any suitable material, a material that may be suitable for the piston body is a polyester elastomeric material manufactured by i? U PONT (DU PONT GORPORATiOl) with trade name '' HYTREL, Type No. 6345. This material has good overall impact resistance. The piston insert includes soft steel or hot steel No. 1020, carbon steel for surface painting (NITRITED), while the guide blade may consist of spring steel such as steel alloy No. 6150.

According to the invention, the threaded portion 37 of the navel 27 of the piston body 20 is slightly smaller in diameter than the corresponding portion with the thread 42 of the piston insert; 21. In addition, it will be appreciated that the tapered surfaces of the trunk -conical portion 41 of the piston insert 21 is substantially configured to conform to its conical shape upwardly diameter 36 of the piston body 20.

* Was the plunger and the assembly guide i

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the top or end 45 of the guide blade 22 enters the slot, 43 of the piston blade 21, so that the end 45 of the guide blade.22 is preferably supported on the curved outward closure 40. It will be appreciated that it is it is desirable to give as much material to the guide blade as possible above pin 23 to reinforce the blade in this region. Therefore, and depending on the particular size of the piston and the piston insert piece, and the position of the pin 25, the curved outlet can be opened to a desired depth for positioning the upper end 45 of the guide blade 22 This will allow a substantial portion of the driver blade material to be positioned above the pin 23, which serves to reduce the fatigue of the blade above the pin. The voltage in this area will be amplified, for example, when the piston and driver move in the downstream direction and the driver blade 22 tends to continue forward movement after the piston body 20 has stopped due to the use of a bracket or inhibitors on the clamp drive device.

As the guide blade 22 enters the piston insert piece 21, the insert piece is screwed to the piston body 20. Because the threaded hole 37 is slightly smaller than the straight portion 42 with the threaded portion of the insert size, this step of assembly serves to press the forked legs of the inserting member of the plunger 21 together and tightly to the blade 22 , thereby enhancing the frictional connection of an insert piece 21 on the guide blade 22.

The continuous movement of the piston interlock piece 21 in. In the piston body 20 from above mounts the interlock piece 21 in passage 35. The conical surfaces of the interlock piece 21 connect the conical passage or hole 36 and serve 36 pressure of the insert piece 21 on the guide blade 22.

* When the insert piece 21 is fully seated in the piston body 20, it is preferable that the curved stopper 40 enters the socket 3a of the piston body 20 rather than protruding above it. This eliminates any projections over the euiqiaviia of the piston body 20 and allows the groove 28 to be positioned as high as possible in the piston body 20, thereby effectively reducing the volume of the displacement chamber above the piston and improving drive efficiency and initial acceleration of the piston, as will be cut.

It will also be appreciated that the taper to the upstream direction of the hole 36 and the conicality of the frustoconical surfaces 41 of the insert piece 21-is about 15 ° perpendicular as shown in the drawings. Such a slope is suitable to promote the inward movement of the forked legs 21 on the guide blade 22, while at the same time reducing the amount of plastic material that must be removed for vg to form the passage for the placement of the insert piece. Using as much plastic as possible contributes to the strength of the piston body, and whichever other angles can be chosen, it is believed that a 15 ° angle is preferable. Also, this conical linkage serves to disperse forces across a large part of the piston body.

It will also be appreciated. that flange or curved stopper 40 of the insert piece 21 extends to. outside the passage 35 and holding a substantial part in the body of the piston, in the socket 3a. Therefore, when the air pressure is introduced into the piston, the air pressure acting on the curved stopper 40 is dispersed. is pumped into the curvature of both the conical part of the insert piece over an essential part of the body of the piston 20 and the downward tension due to air is applied not only to the insert piece 21 with respect to the piston, but also to, throughout the body of the plunger 20, thereby reducing any tension, .c^k example of penetrating the insert piece through the body of the plunger 20.

Concerning the assembly of the insert block 21 to the body of the plunger 20, it will be appreciated that the curved outlet closure 40 of the insert block 21 can be configured in any of the shapes to permit the application of a tool / s, a. the screwing of the insert piece 21 to the body of the piston 20. * As shown in Fig. 2, the holes 47 are provided in the curved outwardly closure 40 to use the wrench that will screw with the bolts the insert piece to the piston body 20. Other means may also be used for this purpose.

It is appreciated that in use, as the pistons Ms. If the guide is driven downward, the guide blade 22 will move a clamp and guide it through the material. As the piston moves downwards, with the driver moving a clamp, forces in the downward direction are applied upwards. . part of the insert piece 21 as well as the piston. This force finds resistance from the opposing forces produced by the movement of the clamp. These opposing forces are transmitted by means of the guide pin 22 to the piston insert 21 through the friction coupling of the insert piece 21 on the guide blade 22 and through the connection of the top end of the blade 45 to the top » end of the insertion block 21. Also such forces may at least partially be produced by attaching the blade to the pin 23 around the surfaces of the hole 48 in the blade 22. Due to the frictional connection of the guide blade 22 to the insertion piece -21, and the direct connection of the edge of the guide / pin pr? interfering piece, however, by forces "p" -&gt;&gt; pierced to a substantially larger surface than that surface directly surrounding the hole 48 in the guide blade 22. * Thus the tension on the blade is dispersed by any particular focal point, thus increasing the life and fatigue resistance of the driver blade 22. As a result, the blade region of the guide 22 directly surrounding the pin 23 is not subject to excessive stress.

* When the piston moves in its downward direction and strikes, for example, the rubber bumper 13, the piston insert piece 21 and the guide blade 22 under normal conditions are tensed by the sudden inertia of the unit. . Rather than having the entire impact force generated at the pin 23 and the blade region of the driver directly around the pin 23, the plunger of this invention tends to transfer these forces to the entire lower region of the blade 22, including of that region connected to the insert piece of the bush 21, thereby alleviating the high cumulative stresses in the hole 48 directly surrounding the pin 23.

This construction serves as an online

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,. , fatigue areas over a large area and at C *; life of the component.

It will also be appreciated that. the plunger, which is worn - at least, its body made of a binder whole, can be made into a reduced sap. Such a reduction in weight or mass translates into a reduced inertia which must be overcome to accelerate the piston to a desired speed. Therefore, when the force driving the clamp is calculated, it is worth noting that less force than air is required to produce a given speed to move a specified clamp on a specified material, as compared to higher weight pistons. This results in a faster, steeper acceleration of the piston and the driver of the invention. At the same time, the improved piston and driver as disclosed serve to disperse the fatigue forces over the entire piston structure and thus improve the life of the driver and piston parts.

These and other advantages and modifications will be readily apparent to those skilled in the art without departing from the scope of this invention, and the present author intends only to make the claims attached to this invention.