JPS5823257B2 - Safety device for dump direction control device in dump truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a site dump truck and a three-turn dump truck that can safely and reliably dump a cargo box in a desired direction on either side from a driver's cab located at a remote location. This invention relates to a safety device for a direction control device.

Conventionally, with the control lever installed in the operator's cab, it was possible to lock, engage and disengage the winnowing wheel and control the dumping direction. This poses a very dangerous problem in that when the dump direction control lever is operated, the hinge side, which remains engaged, also disengages.

In view of the above-mentioned problems, the present invention automatically locks the operating lever in relation to the lifting of the cargo box when the cargo box is rising. This solves the problem of the hinge coming off.

□ Hereinafter, an example in which the device of the present invention is used for side dumping will be explained with reference to the drawings.
is the vehicle frame, 2 is the cargo box mounted on the vehicle frame 1, 3, 3/,
3//, 3///A plurality of hinge units are provided respectively at the front and rear four corners between the vehicle frame 1 and the cargo box 2, and connect the vehicle frame 1 and the cargo box 2 in a detachable manner.

Reference numeral 4 denotes a hydraulic cylinder which is interposed approximately in the center between the vehicle frame 1 and the cargo box 2 and dumps the cargo box in a desired direction on one of both sides, centering on the appropriately selected hinge unit.

; Hinjunits mentioned above) 3. 3', 3",
Since the hinge unit 3 has a 3' 11 structure, one of the hinge units 3 will be explained with reference to FIGS. 2 and 3. a lower hinge 7 formed with an engagement recess 6 opening to the lower hinge 7; and an upper hinge fixed to the lower surface of the cargo box 2 opposite to the lower hinge 7 and fitted with a hinge pin 8 that can fit into the engagement recess 6. It consists of 9.

Reference numeral 10 denotes a locking pawl that is rotatably supported by a shaft 11 at the lower part of the lower hinge 7 and engages with the hinge pin 8 of the upper hinge 9. The unit 3 can be switched between a locked state and a detachable state.

Reference numeral 12 indicates a locking device that allows the locking pawl 10 to swing when the cargo box 2 is fixed on the vehicle frame 1; Piece 13 and
An engagement pin 14 is fixed to the side surface of the locking pawl 10, and the locking piece 13 engages when the upper hinge 9 rotates around the lower hinge 7 and the cargo box 2 rises. has been done.

15 indicates an arm integrally attached to the base of the locking claw 100.

Next, each hinge unit 3. 3/, 3'/, 3
1// each locking claw 10. 10', 10", 1
To explain the operation system for the 0 to oscillation operation in FIG. One end and one end of the rear bell crank 17 are connected by a transmission rod 18, and the front and rear bell cranks 16,
The number 17 is chosen as a last name so that they can rotate in unison.

The other end of the front bell crank 16 is connected to the front locking pawl 10.10 via cross rods 19, 19' extending in both side directions.
``, and the other end of the rear bell crank 17 is connected to the rear locking pawl 10''!, 10?) each arm 15'' by a cross rod 20°20'.
It is connected to 15'.

Reference numeral 21 denotes a control lever that is provided in the driver's cab 22 and can be switched to two positions A and B, respectively. It is connected to one end of the bell crank 16.

The present invention has the above configuration, and when the user wants to dump the cargo box 2 to one side, the operating lever 21 is switched to the A position.

When the operating lever 21 is switched to the A position, as shown in FIG.
are rotated inwardly by the extrusion of the cross rods 19', 20' and are separated from the hinge pins 8', 8'.

On the other hand, the locking claws 10, 10'tj provided on the other front and rear sides rotate outward as the cross rods 19, 20 are drawn inward, and engage with the hinge pins 8, 8'.

When the hydraulic cylinder 4 is extended in the above state, the cargo box 2 is side-dumped around the hinge units 3, 3'' as shown in FIG.

When the dump truck is in operation, the hinge units 3, 3
``(7) Upper hinge 9, 9''U As the cargo box 2 rises, it will rotate counterclockwise in FIG. 2, so the upper hinge 9. ff' (D hinge pin 8, 8"K fixed engagement piece 1
3 and 13' are engaged with the locking pin 14.14''K fixed to the side surface of the locking claw 10.10' to hold the locking claw 10.1σ' in a locked state, thereby locking the operating lever. 21
The movement of people is regulated, making it extremely safe.

Next, when the cargo box 2 is lowered onto the vehicle frame 1, the locking device 12 is released and the operating lever 21 can be operated.

When the operating lever 21 is switched to the B position, each locking pawl 10.
10', 1σ', and 10''' operate in the opposite manner to the above, allowing the cargo box 2 to be dumped to the side opposite to that shown in FIG. 10',
10/' is held in a locked state, whereby the operating lever 21 is also locked at the B position.

Similarly, in the above embodiment, each of the locking claws 10, 10'.

10'' and 10''' are controlled by the operating lever 21 connected to the push-pull wire 23, but a rotary solenoid may be provided in the middle of the transmission member and the control may be electrically controlled from the operator's cab 22. A cylinder may be provided in the middle of the transmission member and controlled by air pressure or oil pressure.

Furthermore, the locking pawl 10 is engaged with the hinge pin 8,
Another locking pin may be provided on the upper hinge 9, and the locking pawl may be engaged with this locking pin.

As described above, in the present invention, the upper hinge rotates around the lower hinge between the side surface of the locking pawl provided on the lower hinge and the appropriate position of the upper hinge, and when the cargo box is in an elevated state, the locking 1 By installing a locking device that holds the lever in a locked state, each locking pawl can be operated from inside the driver's cab. There is no danger that the locking pawl will swing and come out of engagement even if you try to operate it, making it extremely safe.

[Brief explanation of the drawing]

FIG. 1 is a rear view of a dump truck, FIG. 2 is a sectional view of essential parts of the present invention, FIG. 3 is a side sectional view, and FIG. 4 is a control system diagram. In the figure, 1 is a vehicle frame, 2 is a cargo box, 3 is a hinge unit, 7 is a lower hinge, 9 is an upper hinge, 10 is a locking claw,
12 is a locking device, and 21 is an operating lever.

Claims (1)

[Claims] 1. A plurality of removable hinge units are provided between the vehicle frame side and the cargo box, and a locking unit that can engage with a part of the cargo box side hinge to put the hinge unit into a locked state or a detachable state. In a dump direction control device for a dump truck, in which a locking pawl is swingably provided on a vehicle frame side hinge, and the locking pawl can be swung by operation of an operating section provided in the driver's cab, the side surface of the locking pawl is A locking device is provided between the cargo box side hinge and the cargo box side hinge at appropriate locations, and is engaged when the cargo box is raised by rotating around the cargo box side hinge and the vehicle frame side hinge to prevent the locking pawl from swinging. Safety device for dump direction control device in dump truck.