JPH11208355A - Cargo receiving base lift device for motor truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cargo receiving base lift device wherein a cargo is mounted in a cargo receiving base and loaded in a cargo bed of a motor truck, in the case of loading/unloading, the cargo receiving base is automatically stopped to a surface equal to a floor surface. SOLUTION: This constitution is formed such that a cargo receiving base 10, lift cylinder 24 vertically lifting this cargo receiving base to a surface almost equal to a floor surface of a cargo bed, tilt cylinder 26 turning the cargo receiving base to an almost vertical position relating to the floor surface, and a hydraulic unit of oil, tank, oil hydraulic motor, oil hydraulic pump, etc., operating these cylinders, are provided, in a part except the cargo receiving base, a magnet 15 is mounted, in the other, a magnetic sensor 13 detecting this magnet is mounted, by action of a solenoid valve receiving an electric signal from this magnetic sensor, the hydraulic unit is operated, the cargo receiving base is turned, to be stopped when it is positioned in a surface almost equal to the floor surface of a motor truck.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truck and a train.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truck loading / unloading device for facilitating cargo handling work, which is mounted on the rear part of a truck of a truck such as a car, and lifts cargo vertically.

[0002]

2. Description of the Related Art The above-described loading / unloading device is generally called a tail gate or a lift gate, and has been widely used because of the convenience of loading and unloading work. A lifting cylinder that raises and lowers the table up and down substantially on the same plane as the floor of the lorry using a link mechanism, a tilt cylinder that rotates the loading table to a position substantially perpendicular to the floor, and these cylinders. A hydraulic unit such as an oil tank, a hydraulic motor, and a hydraulic pump to be operated is provided.

[0003] In loading and unloading cargo on a truck, loading the cargo on the truck, and loading / unloading the truck, it is necessary to stop the truck on the same plane (horizontal) as the floor surface. It was necessary to visually observe the horizontal state and release the hand from the switch.

[0004]

Therefore, in the above-mentioned visual judgment by a human, the accuracy of the horizontal stop state is poor, and skill is required to perform the horizontal stop.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pallet mounted on the floor end of a truck of a lorry, and a trolley of the truck using the linkage by using a link mechanism. A lifting cylinder for raising and lowering up and down on the same plane as the floor surface, a tilt cylinder for rotating the load receiving table to a position substantially perpendicular to the floor surface, an oil tank for operating these cylinders, a hydraulic motor, A hydraulic unit such as a hydraulic pump is provided, and a magnet is attached to any one of the parts other than the loading tray, such as the loading tray or the link mechanism, a floor end of a lorry, and the like, and the other magnet senses the magnet. The hydraulic unit is actuated by the action of a solenoid valve that receives an electric signal from the magnetic sensor, and the loading pallet rotates to be substantially flush with the floor of the truck. By being configured to stop when positioned to provide a receiving platform lifting device of freight vehicles, wherein.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a magnetic sensor and a magnet on one side according to an embodiment of the present invention, and FIG. 3 shows a hydraulic circuit diagram for operating the receiving table,
FIG. 4 shows an electric wiring diagram of the horizontal stop mechanism according to the present invention,
5 and 6 show another embodiment of the present invention.

As shown in FIG. 1 and FIG. 2, the loading / unloading device of a conventional truck is composed of a loading tray 10, two pivots 12 and 14 at the rear of the loading tray 10, The pivots 16 and 1 are also located at two places above and below the floor of the car.
8, a first arm member 20 rotatably connecting the pivots 12 and 16 and a second arm member 22 rotatably connecting the pivots 14 and 18 are parallelograms. And a lifting cylinder 24 for vertically moving up and down on the same plane as the floor of the lorry using the link mechanism, and a tilt for rotating the load receiving table to a position substantially perpendicular to the floor. It is constituted by a cylinder 26.

According to the hydraulic circuit diagram of FIG. 3 for operating the loading tray of this embodiment, a balance cylinder 28 is disposed between the lifting cylinder 24 and the tilt cylinder 26. Oil tank 3 as a unit
0, a hydraulic motor 32, a hydraulic pump 34, and a pressure adjusting valve 36, and the pump 34 has a suction filter-3.
8 and the pump 34 and the three-way solenoid valve 4
0 is provided with a check valve 42, and a pipe branched from the pipe between the three-way solenoid valve 40 and the check valve 42 is provided with a descending solenoid valve 44 and a flow control valve 46. 30
And a pipe between the three-way solenoid valve 40 and the two elevating cylinders 24, 24 is provided with a flow control valve 5
0 is provided, and a pipe between this flow control valve 50 and one of the elevating cylinders 24 is provided with a fall prevention solenoid valve 52, and a pipe between the other elevating cylinder 24 is provided with a sudden fall prevention solenoid valve 54. And the three-way solenoid valve 40 and two tilt cylinders 2
6 and 26, and the three-way solenoid valve 4
0 and two pipes communicating between the two lifting cylinders 24, 24 are provided with a balance cylinder 2 according to the present invention.
8 is provided, and a pipe between the balance cylinder 28 and one tilt cylinder 26 is provided with a fall prevention solenoid valve 52, and a pipe between the balance cylinder 28 and the other tilt cylinder 26 is provided with a rapid fall prevention solenoid valve 54. Is provided.

In one embodiment of the present invention shown in FIG. 1, a magnetic sensor 13 is attached to a connecting pipe 11 connecting left and right elevating cylinders 24, 24 of a loading table 10 and a link mechanism.
The magnet 15 is attached to the lower part of the lower surface of the loading tray 10, and the distance between the magnetic sensor 13 and the magnet 15 changes with a predetermined gap L according to the rotation of the loading tray 10. An electric signal is sent from the magnetic sensor 13 to the solenoid valve so as to stop when the truck is located on substantially the same plane as the floor of the truck.

In the electric wiring diagram of the horizontal stop mechanism according to the present invention shown in FIG. 4, an electric signal is transmitted from the magnetic sensor 13 through the wiring 17 to the solenoid valve section 27 from the wiring port 19 through the relay circuits 21 and 23. Further, the electric signal is transmitted from the toggle switch 35 through the wiring 29 through the wiring 29, and the electric signal is transmitted from the grommet 25 to the tank return solenoid 33.

The present invention is not limited to the above embodiment. For example, as shown in FIG. 5, a magnet 15 is attached to the connecting pipe 11 and a magnetic sensor 13 is attached to the lower portion of the lower surface of the loading tray 10. As shown in FIG. 6, a magnetic sensor 13 may be attached to the lower surface of the rear end of the lorry, and a magnet 15 may be attached to the receiving tray 10, regardless of the mounting location and the mechanism of the lifting device of the receiving tray. Various design changes are possible without departing from the spirit.

[0012]

As described above, according to the present invention, there is no need for visual judgment by a human, and it is possible to accurately stop the loading tray horizontally, and furthermore, without contacting the loading tray by using a magnetic sensor. Since the condition of the receiving platform can be sensed, the magnetic sensors and magnets
It works even when covered with snow, etc.

[Brief description of the drawings]

FIG. 1 shows a magnetic sensor and a magnet on one side according to an embodiment of the present invention.

FIG. 2 shows a loading / unloading device of a truck.

FIG. 3 shows a hydraulic circuit diagram for operating the loading tray.

FIG. 4 shows an electrical wiring diagram of a horizontal stop mechanism according to the invention.

FIG. 5 shows another embodiment of the present invention.

FIG. 6 shows another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Receiving stand 11 Connecting pipe 12 Pivot part 13 Magnetic sensor 14 Pivot part 15 Magnet 16 Pivot part 17 Wiring 18 Pivot part 19 Wiring port 20 First arm member 21 Relay circuit 22 Second arm member 23 Relay circuit 24 Lifting cylinder 25 Grommet 26 Tilt cylinder 27 Solenoid valve part 28 Balance cylinder 29 Wiring 30 Oil tank 31 Wiring port 32 Hydraulic motor 33 Tank return solenoid 34 Hydraulic pump 35 Toggle switch 36 Pressure adjustment valve 38 Suction filter 40 Three-way solenoid valve 42 Check valve 44 Lowering solenoid valve 46 Flow control valve 50 Flow control valve 52 Fall prevention solenoid valve 54 Rapid fall prevention solenoid valve

Claims (1)

[Claims] 1. A loading platform mounted on a floor end of a truck of a lorry, a lifting cylinder for vertically moving the loading platform up and down on the same plane as the floor of the truck of the lorry using a link mechanism, A hydraulic cylinder such as a hydraulic cylinder, a hydraulic motor, or a hydraulic pump that operates the tilt cylinder for rotating the load receiving table to a position substantially perpendicular to the floor surface; and the load receiving table or the link. A magnet is attached to any one of the parts other than the receiving platform such as a mechanism, a floor end of a truck, etc., and a magnetic sensor for sensing the magnet is attached to the other, and an electric signal from the magnetic sensor is transmitted. The hydraulic unit is actuated by the action of the received solenoid valve, and the load receiving platform is turned to stop when it is positioned substantially flush with the floor of the truck. Lifting / lowering device for cargo trucks.