Device for vessel discharge, particularly dust-bin discharging

BACKGROUND OF THE INVENTION The present invention relates to a device for emptying containers, in particular waste containers into collecting tanks, which is provided with a lifting and / or tilting device which is driven by at least one pressure medium motor and is provided with a lifting and / or tilting frame for holding the container to be emptied. at least one pressure medium motor is controlled by a pressure medium valve that is inserted into the pressure medium working circuit and which is connected to its control circuit by its control device, provided with a timing switch for temporally controlling a valve determining the course of the evacuation movement, the timing switch being connected by a switching element for its control and for actuating the control circuit.

A device of this type is known from DE-OS 27 21 059, in which a hand-operated pressure switch is provided on the side of the hopper, the pressure switch being provided as an element actuating the vessel emptying process. With this device, the container to be emptied must be placed on the tilting and / or lifting frame or at least placed in a suitable position before the automatic container emptying process is started by acting on the hand switch. In practice, it is not possible to prevent a prepared or inserted garbage container from being sometimes caught incorrectly by the tilting and / or lifting frame. Therefore, the device known from DE-OS 27 21 059 is associated with an increased risk of injury.

Furthermore, DE-PS 1 028 935 discloses a dumpster for dustbins in which the pressure control valve of the pressure medium motor is provided with a manual control element which, when the pressure valve of the pressure medium motor is in the operating position, can be inserted behind the return bracket. a shut-off device is assigned to the operating medium of the pressurized medium by sliding the control valve's manual actuator past the return bracket and releasing the control valve to return to its initial position, if adequate action of compressed air on the cut-off device has been achieved. The shut-off device is controlled by a relief valve which is actuated by the pivot shaft of the lifting and / or tilting device. If it is desired to shake the container to be emptied in the tilted position, corresponding cams for the relief valve can be provided on the pivoting shaft of the tipping and / or lifting device. This causes a multiple reciprocating tilting movement in the end tilting region of the tilting and / or lifting device if the pressure medium does not sufficiently act on the shut-off device, thereby releasing the hand control from the holding bracket so that the control valve can return to its initial position. This known device, on the one hand, assumes working circuits with a pneumatic pressure medium and, on the other hand, requires that the emptying process be initiated by manual action on the control valve and that the manual control element of the control valve be locked.

Both known devices, when operated by one person only, require that the container to be emptied be either hung on a corresponding lifting and / or tilting frame device, or that the operator simultaneously hold the container to be emptied and operate the control valve. tilting frame and / or incorrect operation of the control valve. Two persons would normally be required to safely fit the container to be emptied on the lifting and / or tilting frame and to operate the control valve reliably.

In contrast, the invention aims to greatly improve the described apparatus so as to maximize the self-control of the emptying process, allowing the operator to only bring the empty container to the lifting and / or tilting frame and during the discharge process could leave the devices, for example, to carry the emptied container and to bring another container to be emptied. In this case, it should be possible for the improved device to drive systems on a pressure medium of different types, i.e. either. hydraulic or pneumatic pressure medium with simple construction, simple operation, high operational reliability and especially economical way of working of the whole device. In addition, my device according to the invention ensures that, during the automatic emptying process, there is no danger that this device would endanger the operator or unauthorized persons.

This object is solved and the drawbacks are remedied by a device according to the invention, which is characterized in that the switch-connected switching element provided with a control device for responding to the waste container present is disposed on a lifting and / or tilting device. There are locking elements on both sides of the lifting and / or tilting device.

By arranging the switching element for initiating the control process according to the invention so that it is directly controlled by the emptying vessel, only the operation associated with the safe and correct transport of the container to the vehicle and the deployment of the container to the emptying device remains into the discharge device, the process of controlling the entire discharge process is also started. In this way, considerably greater reliability is achieved in the automatic emptying process even with single-handed operation.

The vessel-actuated switching element may be formed as a touch switch cooperating with portions of the vessel. The main advantage of such tactile switches is that they are only actuated mechanically by a container placed in the correct position.

The vessel-actuated switching element may also be formed as one or more sensors, cooperating in contact with the vessel parts. Sensors of various types, such as ultrasonic sensors, which respond to the reflection of supersonic waves striking the vessel wall, are suitable for this purpose. Magnetic switches which respond to the storage of magnetic particles associated with the container to be stored are also contemplated. In addition, any other optically or electrically operating sensors can be provided.

A further possibility of forming the device according to the invention consists in that the vessel-actuated switching element is formed by a part of the vessel cooperating with light barriers. Preferably, for safety reasons, a plurality of light curtains are provided at different locations near the lift and / or tilting frame, all of which must be covered by the container wall in order to initiate the switching process, in order not to cause the whole process to be caused by that would get into the light barrier area accidentally.

Whereas the switching element actuated by the emptied container is usually fixedly fixed and is usually provided on the hinged and / or lifting frame, and whereas in today's operation there are still often containers of considerably different construction and differences in their side wall design, It is recommended within the scope of the invention to provide a manual control switch in addition to the container-operated switching element for switching on the control operation. This is intended to enable the operator to ensure the start of the emptying process when a container is brought to the emptying device which is not suitable for automatically switching on the switching element. In this case, a manual control switch can be provided on the control valve control device for switching on the control process and a common manual control element can be provided for the manual control switch and the control valve. The electric control circuit provided for the timing of the valve can be designed to control the tilting and / or lifting mechanism by reversing to the initial position when released by an intermediate vessel of the actuated switch, preferably immediately upon release of the switch, or when the current circuit is interrupted. switch connected. This ensures that when the emptying container is incorrectly gripped by the lifting and / or tilting device, the initiated emptying process is interrupted and put back in order to repair the receptacle of the empty container.

The device according to the invention is applicable both to single hoppers and to multiple hoppers, for example double or double hoppers, triple hoppers or the like, i.e. hoppers in which at least two separate lifting and / or tilting devices are arranged side by side and are operable. either. separately or together. The invention can also be applied to so-called combined hoppers in which two or more separate lifting and / or tilting devices are arranged side by side, optionally operated separately or together. This makes it possible to use the individual lifting and / or tilting devices separately and independently of one another for smaller containers and as a whole together for emptying larger containers.

The locking elements are designed as pivot levers mounted on both side walls of the collecting well. These locking elements can be operated by hand and in their operative and resting position

OS 275 990 B6 position can be maintained by springs. However, it is also possible to operate the closure elements by means of a pressure medium motor.

The invention is explained in more detail below with reference to the drawing.

FIG. 1 is a schematic side view of a lifting and / or tilting device according to the invention with open closing elements and without emptying container. Giant. 2 is a schematic side view of the lifting and / or tilting device as in FIG. 1 with the locking elements closed and the waste container inserted. FIG. 3 schematically illustrates a hydraulic drive and control system of the apparatus of FIGS. 1 or 2 for a single hopper. In FIG. 4 is a rear view of an emptying device in the form of a combination hopper with two juxtaposed, optionally jointly or separately operable lifting and / or tilting devices. FIG. 5 is a schematic representation of a hydraulic drive and control system for a double or double hopper, and FIG. 6 is a schematic representation of a hydraulic drive and control system for the apparatus of FIG. 4.

1 and 2 it is a lifting and / or tilting device for emptying garbage containers into the collecting well 2 of a garbage vehicle with a discharge device 3. The discharge device 3 can be designed as a single or double, possibly double, in the latter case, two lifting and / or tilting devices 4 operating independently of one another. The lifting and / or tilting device 4 has a swinging arm 5 or a pair of swinging arms 5 on which a lifting and / or tilting frame 6 is provided by means of a four-articulated guide (not shown). The lifting and / or tilting frame 6 is according to the type of containers 1 to be emptied. In this example, on its upper part, it is provided with a support rail 7 extending below the edge of the garbage container 1, and on its lower part with a support element 8 resting on the wall of the garbage container 1. The working cylinder device 9 shown schematically is used to raise and lower the lifting and / or tilting frame 6. The garbage container 1 is locked by pressing its edge with the support rail 7 against the support 60 provided on the swing arms 5. The swing arms 5 are driven by means of a work roller device vytvoř designed as swing motors in the exemplary embodiment. The lifting cylinder working device 9 and the swing cylinder working cylinder device 11 of each lifting and / or tilting device 4 are connected to a common pressure medium working circuit - see Fig. 3. operation of first the working cylinder device 9 and then the working cylinder device 11 for the pivoting motor. In the embodiment of FIG. 1 and 2, the switching element 12, operated by the garbage container 6 and intended to switch on the automatic control of automatic operation, is provided below the support rail 7 on that side of the lifting and / or tilting frame 6 which faces the wall of the garbage container 7. This switching element 12 may also be at another point of the lifting and / or tilting frame 6, for example in the region of the support element 8. Instead of the touch switch element 1.2, a non-contacting sensor or photocell or the like may also be provided.

Since there are currently many garbage containers in operation with different construction shapes and deviations in the inclination of their side walls, it is advisable to provide, in addition to the switching element 12 which is controlled by the garbage container 1, a manual control switch, such as a switch 13, located on the hopper body at a location that can be easily reached by the operator. In the illustrated embodiment, this hand-operated switch 13 is combined with a control valve 36 arranged in the working medium of the pressurized medium such that both parts have a common electromagnetic actuator 36a and a common hand-operated control H. In this case, the hand-operated switch is designed as a magnetic sensor a switch which is brought from one switching position to the other when the control rod, guided axially by the electromagnetic control device 36a and the control valve 36, approaches.

To protect non-interested persons, for example passing pedestrians, two locking elements 1.5 are pivotably mounted on the side walls of the garbage truck. These locking elements 15 can be connected to one another in the form of a yoke and are mounted on a common one

CS 275 990 B6. In the embodiment of FIG. 1, the locking elements 15 are pivotable by hand to and from their locked position. When the dead position is exceeded, they are held in their upper and lower positions by a retaining spring 26, which is designed as a tension spring. In the embodiment according to FIG. 2, a pressure medium motor 17 or a pair of pressure medium motors 17 are provided for adjusting the closure elements 15. In the illustrated embodiment, the locking elements 15 actuate the auxiliary switch 16 in their locked position.

The operation of the device constructed as a simple hopper according to Fig. 1 or Fig. 2 is explained in connection with Fig. 3.

A hydraulic pressure medium system is provided for driving the lifting and / or tilting device 4, which is supplied by a pressure medium pump 33. From this pressure medium pump 33, the pressure medium supply line 34 leads through the pressure medium return valve 35 to a control valve 36, which is designed as a two-position valve. To this control valve 36 is connected a pressure medium supply 37 which leads to pressure medium motors arranged in parallel connection, i.e. to the work cylinder assembly 9 and to the work cylinder assembly. A pressure relief valve 38 with an actuator 39 is connected to the pressure medium supply 37. From this pressure relief valve 3θ, the pressure relief line 40 leads to a pressure medium return valve 41 which is inserted into the pressure medium return line 42 to improve the return flow of the pressure medium and thereby the reciprocating movement of the work roll device 9 and the work roll device. Further, from the control valve 36, the bypass pipe 43 leads to a pressure medium return valve 41. The pressure medium return line 42 extends from the pressure medium reservoir 43a from which the pressure medium pump 33 sucks the amount of pressure medium required for the entire system and leads it through the pressure medium supply line 34 to the pressure medium working circuit.

To control the working medium of the pressure medium, there is provided a control current circuit consisting of a switching element 12 provided on the lifting and / or tilting frame 6 and which is controlled by an intermediate waste container 1 and a timing relay 45 connected thereto in series. The timing relay 45 is connected to the electrical control device of the changeover valve 36 of the pressure medium working circuit. The time constant of the timer relay 45 is set to the time required by the lifting and / or tilting device 4 for lifting, tilting and emptying the waste container 1.

As soon as the switching element 12 is actuated by the inserted waste container 1, it connects the control circuit to the power source 44 and establishes an electrical contact between the power source 44 and the switch valve electrical actuator via a timing relay 45 at a time corresponding to its time constant. 36. Thus, the control device keeps the control valve 36 in the operative position against the return force of its spring during the flow of current. Here, the pressure medium flows from the pressure medium pump 33 through the pressure medium line 34 to the pressure medium supply 37 and from there to the work roll device 9 and the work roll device 11. Both of these working cylinder devices 9, 1-1 have piston diameters in such a relationship that the initial power of the working cylinder device 9 is greater than that of the working cylinder device 11. Therefore, the lifting process of the work roll device 9 is almost completed when the tilting process begins with the work roll device 11 with the result of a small pressure increase. In FIG. 3 The pressure relief valve 38 shown is such that, in the end tilting position, the oscillation limiting lever, with its adjusting screw, engages the pressure relief valve actuator 39, which lever is mounted on the pivoting shaft of the lifting and / or tilting device 4 and its swing also turns. The pressure relief valve 38, which was previously in the closed position, is brought into the partial opening position against the action of its adjusting spring so that partial relief in the pressure medium supply 37 takes place via the pressure medium relief pipe 40 towards the pressure medium return valve 41. If there is a sufficiently large gap between the control commands to control the pressure relief valve 38 and the end position of the swing limiting lever, the pressure relief valve 38 opens to such an extent that a strong pressure drop occurs in the pressure medium supply line 34. This allows the lifting and / or pivoting backward

CS 275 990 B6 of the tipping device 4 with the emptied waste container 1 is of such a value that the pressure relief valve 38 closes again. If the pressure medium switching valve is still in the working position, the incoming pressure medium causes the lifting and / or tilting device 4 to swivel again. Thereby, the adjusting screw of the lever for restraining the pressure limiter restrains the actuator 39 of the pressure relief valve 38 and causes a pressure drop of the pressure medium in the pressure medium supply 37 with the pressure relief valve 38 open and the resulting swiveling of the lifting and / or tilting device 4 1 for garbage. In this way, a shaking movement can be triggered, thereby ensuring that the container is completely emptied! for garbage.

Completely swivel and retract the container The garbage collector is started by breaking the connection between the electrical control device of the change-over valve 36 and the power source 44 after the set time has elapsed, thereby switching the change-over valve 36 to its rest position by means of its return spring. The pressure medium coming from the pressure medium pump 33 through the pressure medium supply line 34 then flows through the bypass line 43 through the return valve 4.¹ The pressure medium returns a suction effect to the pressure medium return line 42, thereby amplifying the effect on the return flow of the pressure medium flowing from the work roll device 9 and the work roll device 11 through the pressure medium supply 37 and the pressure medium return pipe 42.

As can be seen from FIG. 3, a valve 80 is inserted in the pressure medium supply 37 to the working circuit to the working cylinder assembly 11, which rhythmically interrupts or narrows the pressure medium supply. This valve 80 is energized by the timing relay 45 when the tipping process has advanced by the desired value. This brings the waste container 1 into a gentle shaking motion to ensure that the contents of the waste container are completely emptied. Switching off the valve 80 is performed by the timing relay 45 at the start of the swiveling process.

The switch 13 shown in FIG. 3, which is arranged parallel to the switching element 12 operated by the garbage container 6 mounted on the lifting and / or tilting frame 6, is a manually operated switch for switching on a control current circuit, such as 1 or 2, for example.

In the arrangement of the discharge device on the garbage vehicle, it is expedient to use the vehicle battery as a power source 44. In the case of a stationary waste collector 2, it is also possible to provide the control circuit with a mains connection.

Instead of the control valve 36, which is shown in FIG. 3 as a two-position valve, a three-position valve with a working, return and rest position can be used. In such a case, it is necessary to use more complicated components of the control current circuit, or more expensive control element for such a changeover valve, such as a second timing relay, which after opening the switching contact by the first timing relay. to the reverse position.

As can be seen from FIG. 3, a two-position shut-off valve 34a is inserted into the pressure medium supply line 34, which is connected via an auxiliary switch 16 controlled by a shut-off element 15 to an electrical control circuit via an electromagnetic actuator. With the auxiliary switch 16 closed, the two-position shut-off valve 34a is brought to the position shown in FIG. 3.₍ wherein it releases the flow of hydraulic pressure medium to the pressure medium supply line 34. When the auxiliary auxiliary switch 16 is disconnected, the two-position shut-off valve 34a is moved by its spring to a second position in which the bypass pipe 43b is connected to the pressure side of the pressure medium pump 33b and leads to the pressure medium reservoir 43a.

If the emptying device according to FIGS. 1 or 2 is designed as a double or double discharge and is provided with two lifting and / or tilting devices 4 arranged side by side, two identical control systems can be provided as in FIG. Each lifting and / or tilting device 4 can be advantageously used. The operation of FIG. 5 is advantageously described below. The operation of the double or double hopper with the steering arrangement is described below.

5, wherein the corresponding structural elements are designated by like characters in FIGS. 3 and 5, but in FIG. 4 they additionally have the letters a and b.

In the dual hopper embodiment shown in FIG. 5, both pressure medium working circuits have a common pressure medium pump behind which a pressure-independent pressure medium divider 46 is arranged so that each pressure medium working circuit has its own pressure medium source. In the embodiment of FIG. 5, a common power source 44 is provided for each of the two control current circuits.

In contrast to the simple device of FIG. 3, each of the two separate lifting and / or tilting devices does not act directly on the pressure medium working circuit control valve 36a, 36b, but controls the pneumatic pressure medium control circuit for its side. Each of the two pressure medium control circuits has a changeover valve 47a, 47b adapted for electrical control, connected to a corresponding control current circuit and connected to the supply line 48a, 48b. This pneumatic control fluid supply line 48a, 48b is connected to a return spring 49a, 49b, whose piston rod 50a, 50b serves as a control element for the control valve 36a, 36b. For both pneumatic pressure medium control circuits, a common pressure medium source 50 is provided, which is connected to pneumatic valves 47a, 47b via branch lines 51a, 54b. In refuse collection vehicles, the compressed air source available on the vehicle for braking devices may be used as the source 50 of the pressure medium.

When the emptied waste container 4 is mounted on the lifting and / or tilting frame of one of the separate hoppers and then the timing relay 45a, 45b is actuated, the pneumatic valve 47a, 47b is maintained in the switching position for the time determined by the timing relay 45a,

45b, so that the pneumatic working cylinder 49a, 49b is subjected to compressed air supplied from the pneumatic pressure medium source 50 via the pressure medium control line, thereby bringing the control valve 36a, 36b of the corresponding working medium of the pressure medium to the working position.

This releases the supply of pressure medium to the hydraulically operating working rollers 9a, 8a and 9b, 1 & apos; and the emptying process begins. The reciprocating and unsetting process of the hoisting and / or tilting frame with the container already emptied is effected such that the timing relay 45a, 45b interrupts the current circuit between the pneumatic valve 47a, 47b and the power source 44. Thereby the pneumatic valve 47a, 47b is brought back to its neutral position by the return force of its spring, thereby disconnecting the pressure medium source 50 from the pressure medium control circuit. This results in a pressure drop in the supply line 48a, 48b and the stroke piston of the pneumatic cylinder 49a, 49b is moved to the rest position by the spring return force, thereby also switching the pressure medium working circuit control valve 36a, 36b to its rest position.

The discharge device of FIG. 4 is a combined hopper, enabling both smaller bins and larger garbage containers to be emptied. For this purpose, two lifting and / or tilting devices 17a, 17b are arranged side by side on the hopper 18. The drive of each of these lifting and / or tilting devices 1.7a, 73b is effected by a separate arrangement of the working cylinder (not shown), which makes it possible to individually control the emptying of small containers. The function of the combined hopper is comparable to the operation of the described simple hoppers. The lifting device of each separate lifting and / or tilting device consists of a four-articulated system and is connected to the support plate 20a, 20b into the lifting and / or tilting frame 21a, 21b. The containers are locked by pressing the edge thereof with the support rails 24a, 22b onto the abutment plates 24a, 24b provided at the upper ends of the swing arms 23a, 23b. For the synchronous operation of the two separate hoppers when emptying large containers, a connecting and supporting beam is provided on the two support rails 22a, 22b, which is connected, for example, by a screw. In the exemplary embodiment, the connecting and support plate 25 are provided on their upper teeth-shaped side with retaining lugs 26a, 6b, which allow the garbage containers 1 to be retained with a variety of upper edge designs. In addition, a dashed insert bumper 27 arranged between the two parts of the support plates 20a, 20b can be inserted.

CS 275,990 B6

In order to empty large waste containers having hinge pins on their sides, in the embodiment according to FIG. 2, swinging support arms 28a, 28b with bearing lugs 29a, 29b for the bearing pins of these two lifting and / or tilting frames 21a, 21b are provided. containers.

Since, when emptying large garbage containers, the time required to carry out the emptying process can be very different, it is assumed that the electrical control of the automatic operation is only switched on when the two lifting and / or tilting devices 17a, 17b are separately operated. Therefore, their own control circuit is assigned to their operating circuits. Advantageously, the vessel-controlled control process switches are mounted on the lifting and / or tilting frame 21a, 21b so that they do not come into contact with the vessel walls when the connection and support plate 25 are fitted.

Due to the different designs of the garbage containers, it is desirable to provide an additional master switch for disconnecting the electrical control circuit while actuating both the lifting and / or tilting devices 17a, 17b when emptying the large garbage containers, which should be designed so as the carrier plate 25 or other connecting elements between the two lifting and / or tilting frames 2 [a, 2] was taken to a position in which the automatic steering is switched off. In such an operating case, the two pressure medium working circuits of the two lifting and / or tilting devices 17a, 17b are connected to each other by means of their changeover valves so that their pressure medium motors are connected in parallel and powered by only one pressure medium source. In order to switch on the discharge device, an operating switch 31a, 31b arranged on one side of the hopper housing must be actuated. This operating switch 3 & apos; a, 31b simultaneously serves to manually control both the lifting and / or tilting devices 17a, 1.7b in the separate operation of the two hoppers, i.e. when the two pressure medium circuits are separated, should the electrical controls for automatic operation fail. If the containers inserted into the lifting and / or tilting frames 2ha, 21b would not operate the switches 30a, 30b, they would be replaced by two latch hand operated switches 32a, 32b, which are arranged on the sump housing 18. At that time, after the container has been placed, an additional working operation must be carried out, whereby the emptying process is carried out automatically and the operator is not bound to the site of the device.

The operation of the described apparatus is explained in more detail below with reference to FIG. 6.

FIG. 6 is a schematic representation of the hydraulic drive system and the electrical control system of the combined hopper of FIG. 2. Similar to the hydraulic diagram of the double hopper of FIG. 4, this hydraulic hopper is provided with two hydraulic working media of pressure medium. optionally join or detach. Each of these pressure medium circuits has its own pressure medium source, which in the exemplary embodiment is formed by one branch 54a, 54b of a pressure-independent flow divider 54 in connection with a pressure medium pump 55 arranged in front of the flow divider 54. In each of these pressure medium operating circuits, the pressure medium supply line 56a, 56b extends from the pressure medium source 54a, 54b via a non-return valve 57a, 57b to a respective transfer valve 52a, 52b. The changeover valve 52a, 52b is connected to the bypass line 58a, 58b in the neutral position, which is connected to the pressure medium return line 60a, 60b via a pressure medium return valve 59a, 59b. In the operating position, the change-over valve 52a, 52b is connected to the pressure medium supply line 61b, which transports the hydraulic working medium to the pressure medium motors 62a, 63a and 63b, 63b, respectively, which are arranged in parallel connection.

In addition, in the embodiment shown in FIG. 6, a pressure transfer valve 61a is inserted into its pressure medium supply line 61a between its connection to the pressure medium connection line 64 of both pressure medium circuits and the control valve 52a, which is switched to the closed position only synchronous operation of both hoppers. All other components of the two pressure medium working circuits and the control current circuits are arranged in the same way. As can be seen from FIG. 5, is connected to each pressure medium supply line 61a, 61b

CS 275 990 B6 Pressure media relief valve 66a, 66b with control element 67a, 67b. From these pressure medium relief valves 66a, 66b, pressure medium relief lines 68a, 68b lead to pressure medium return valves 59a, 59b. The control of the working medium of the pressure medium is effected, as in the embodiment of FIG. 3, by direct action on the switch valve 52a, 52b adapted for electrical control.

The electric control circuits each consist of one timing relay 69a, 69b, one control switch 70a, 70b, which is arranged on the lifting and / or tilting frame of each individual hopper, and one hand control element 7a, 7b, which is connected to it in parallel. In order to ensure that, in the unsecured working area, the automatic control of the two separate hoppers is out of order, a switch 74 is inserted into the common connection line 72 of both control current circuits with the power source 73, which is closed in the locked position. An interlock switch 75 is additionally provided between this switch 74 and the power source 73.

As can be seen from FIG. 5, the change-over valve 53 inserted into the connecting line 64 of the two pressure medium circuits and the change-over valve 65 inserted into the supply line 60 and the pressure medium of only one pressure medium circuit are designed for electrical control and connected together. with control current circuits to a power source 73. The two change-over valves 53 and 65 are reversed, so that when both hoppers are operated independently, the change-over valve 53 is in the closed position and the change-over valve 65 is in the forward position. In this operating state, the switch 75 is closed, i.e. unlocked. If, on the other hand, a bolt is inserted or the connecting and supporting plate 25 is inserted, i.e. the switch 75 is opened, the switching valve 65 inserted into the supply line 60 and the pressure medium is switched to the closed position by spring force. a change-over valve 53 inserted into the connecting line.64 by means of a spring force into the forward position, thereby creating a parallel connection of all motors 62a, 62b, 63a, 63b for the pressurized medium and the discharge device is operationally ready for synchronous operation of the two individual hoppers for emptying large waste containers. In this case, to switch on the piston devices of both hoppers, the changeover valve 52b must be actuated by hand by the actuator 76b. In this case, both the pressure medium lift cylinders 63a, 63b and the two pressure medium swivel drive cylinders 62a, 62b are filled with the same amount of flowing pressure medium as in a single control, only one lift cylinder and one swivel drive cylinder.

In the embodiment of FIG. 6, with respect to the design of the switch valve 52a,

52b as a two-position valve for the common operation of the two hoppers it is necessary to provide a changeover valve in the pressure medium supply line 61a of one pressure medium circuit. It would also be possible to design the pressure medium switch valves 52a, 52b as three-position valves for the zero, lift and lower positions, thereby eliminating the additional switch valve 65, and the joint operation of the two lifting and / or tilting devices could be achieved by operating both the left and the right pressure medium switch valve 52a, 52b. Of course, it must be taken into account that a three-position pressure medium changeover valve requires more expensive electrical control devices in order to maintain automatic control of the two hoppers in a single operation.