JPS5839086B2 - Safety device for dump direction control device in dump truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a side dump truck and a three-turn dump truck which are capable of dumping a cargo box in a desired direction on one of both sides from a remote location in a driver's cabin in a safe and secure manner. This invention relates to a safety device for a dump direction control device.

Conventionally, with the control lever f installed in the driver's cab, the dumping direction could be controlled by engaging and disengaging the hinge. When the control lever is actuated, the hinge side that maintains the secured state also becomes disengaged, which is extremely dangerous.

In view of the above-mentioned problems, the present invention automatically locks the locking pawl communicating with the operating lever in relation to the lifting of the cargo box when the cargo box is rising, thereby preventing the operating lever from being accidentally activated. This solves the problem of the hinge in the locked state coming off when you try to move it, making it possible to safely control the dumping direction.

Hereinafter, an embodiment in which the device of the present invention is used in a side dump truck will be explained with reference to the drawings. In Fig. 1, 1 is a car frame, 2 is a cargo box mounted on the car frame 1, and 3.3
', γ 3M indicates a plurality of hinge units that are respectively provided 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.

Since the hinge units 3, 3', 3'', and 3' have a low structure, one of the hinge units 3 will be explained with reference to FIG. A lower hinge 7 is formed with an engaging recess 6 that protrudes from the upper part and opens upward;
The hinge 9 is provided with a hinge pin 8 that can be fitted with the hinge 9.

10 is a shaft f that can be freely swung by a shaft 11 at the base within the lower hinge 7.
This shows a locking pawl that is pivoted and engages with the hinge pin 8 of the hinge 9 described above, and by engaging and disengaging the locking pawl 10, the hinge unit 3 can be switched to a locked state or a detachable state. An integral arm 15 is attached to the base of the locking pawl 10.

Next, the operation system for swinging the locking claws 1o, io', iσ', 10'' of each hinge unit 3, 3', 3', 3'' will be explained with reference to FIG. The pair of bell cranks 16 and 17, which are rotatable in a horizontal plane, are provided at the front and rear central portions of the front bell crank 16.
One arm 16' of the rear bell crank 17 is connected to one arm 1γ of the rear bell crank 17 by a transmission rod 18, so that the front and rear bell cranks 16 and 17 can rotate in synchronization.

The other arm 16'' of the front bell crank 16 is connected to the arms 15, 15' of the front locking pawl 10, 10' via cross rods 19, 19' extending in the direction of both sides, and is connected to the arms 15, 15' of the front locking pawl 10, 10'. The other arm 1T of 1γ is connected to the mouth-like rear locking claw 1σ by means of cross rods 20 and 20'.
Each arm 15', 15' of 10'' is connected.

Reference numeral 21 denotes an operating lever that is provided in the driver's cab 22 and can be switched to two positions A and B. This operating lever 21 is connected to a push-pull wire 2 that is provided along the vehicle frame 1.
The arm 16 of the front bell crank 16 mentioned above through 3
′.

Reference numeral 24 designates a locking device that locks the locking claws 10, 10', 1σ', and 10'' when the cargo box is raised in FIGS. 4 and 5, and this locking device 24 is connected to the bell crank. It consists of a locking pin 25 hanging down from the surface of the arm 1g' of 16, and a locking piece 27 pivotably supported at the front part of the inside center of the vehicle frame 1 so as to be able to swing vertically. is formed with an abutting portion 28 that abuts against the lower surface of the cargo box 2, and the base is formed with the locking pin 2.
5 is formed, and this engaging part has a central locking groove 29 in which the locking pin 25 engages and a locking surface 29 on both outer sides.
and 29', and when the locking pin 25 engages with the central locking groove 29, the operating lever 21 is at the neutral position in the center between A and B, and the locking claws 10, 10'.

1σ', 10F is each hinge pin 8, 8', 8'',
8', and the locking pin 25 is engaged with one of the locking surfaces 2 on both outer sides.
9' or 29'', the operating lever 21 is located at A or B, and the pair of locking pawls on one side engages with the hinge pin, and the pair of locking pawls on the other side engage with the hinge pin. break away.

In addition, 30 is a spring energized to move the base of the locking piece 27 downward, and 31, 31' and 32° 32' are spring cylinders inserted in the cross rods 19, 1g and 20, 20'. shows.

With the above configuration, when the cargo box 2 is lowered onto the vehicle frame 1, the locking piece 27 and the locking pin 25 are disengaged as shown in FIGS. 3 and 5. Therefore, the operating lever 21 can be moved freely, and when the operating lever 21 is switched to the A position to dump the cargo box 2 to one side, it will move forward and backward as shown in Fig. 3. A locking pawl 10' is provided.

10' is extruded by cross rods 19' and 20',
Both rotate inward (this way, they separate from the hinge pins 8', 8').

On the other hand, the locking claws 10 and 1σ' provided on the front and rear sides pull the hinge pin 8 by pulling the cross rods 19 and 20 inward.
．． 8X'' is maintained, and in this case, the springs in the spring tubes 31 and 32 are compressed, and the distance between the cross rods 19 and 20 becomes slightly longer.

When the hydraulic cylinder 4 is extended in the above state, the cargo box 2 is moved to the hinge 3 as shown in FIG. Side dump centered on γ.

By the way, when the cargo box 2 rises, the abutting portion 28 of the locking piece 27
As the packing box 2 that was pressing the box 2 is released, the locking piece 27 rotates clockwise as shown by the two-dot chain line in FIG. 5 due to the force of the spring 30, and the outer locking surface of the locking piece 27 29, thereby restricting the movement of the operating system, and even if an attempt is made to move the operating lever 21, the operating lever 21 will not move when the cargo box is raised, making the emergency E safe.

Next, when the cargo box 2 is lowered onto the vehicle frame 1 and the abutting portion 28 of the locking piece 27 is pressed downward, the locking device 24 is released and the operating lever 21 can be operated.

Then, when the operating lever 21 is switched to the B position, each of the locking claws 10, 1σ, 1(y/, 10'' operates in the opposite manner to the above, and the cargo box 2 is dumped to the side opposite to that shown in FIG. 1. Furthermore, when the cargo box 2 is raised, the control lever 21 is held in a locked position at the B position.

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

1σII and lQ# are controlled by an operating lever 21 to which a push-pull wire 23 is connected.
A rotary linoid may be provided in the middle of the transmission member, which is the operation system, and electrically controlled by the driver's cab 22, or a cylinder may be provided in the middle of the transmission member and controlled by air pressure or hydraulic pressure. .

Furthermore (in the above embodiment, we explained the side dump in two directions, but in the case of a three-turn dump in three directions,
At the neutral position of the operating lever 21, the pair of locking pawls at the rear engage with the hinge pin, and the pair of locking pawls at the front disengage from the hinge pin (rubbing).

As described above, the present invention provides a removable locking piece in a part of the operation system that swings in relation to the lifting and lowering of the cargo box and can operate the locking pawl. In this case, the movement of the operating system is restricted in a lock-like manner, and when the cargo box is lowered onto the vehicle frame, the operating system can be moved freely. If the dumping direction can be controlled by operating the pawl, there is no danger that the engaged pawl will come off when the box is raised, making it extremely safe.

In particular, the locking piece is installed inside the car frame, so when the car runs onto rough ground and the cargo box is dumped, even if the car frame twists left and right, the distance between the locking piece and the bottom surface of the cargo box does not change, so the locking piece operates reliably in conjunction with the lifting and lowering of cargo boxes.

Or, all the locking claws can be held in a locked state by the locking pieces provided at the - points, and all the locking claws can be held in a locked state no matter which direction the cargo box is dumped.

[Brief explanation of the drawing]

Fig. 1 is a rear view of the dump truck, Fig. 2 is a sectional view showing the hinge unit, Fig. 3 is an operation system diagram of the locking pawl, and Fig. 4 is a diagram of the operation system of the locking pawl.
The figure is a plan view of the main part of the present invention, and FIG. 5 is a side sectional view of FIG. 4. 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,
21 is an operating lever and 27 is a locking piece.

Claims (1)

[Claims] 1 A plurality of removable hinge units with locking claws at the front and rear four corners between the vehicle frame side and the cargo box side are installed (each locking claw is provided on the front and rear sides of the vehicle frame, and each of these locking claws is In a dump direction control device for a dump truck, which can be oscillated through an appropriate operation system attached to the vehicle frame by operating an operation unit provided in the driver's cab, there is a device for lifting and lowering a cargo box at an appropriate position inside the vehicle frame. A locking piece that operates in conjunction with the locking piece is provided, and the locking piece has a neutral position where the pair of rear hinge units are at least locked, and a neutral position where the pair of rear hinge units on the negative side are locked and the other side. An engaging portion that can be engaged with a part of the operating system is formed at each position between the side dump position and the side dump position where the pair of hinge units are disengaged, and when the locking piece is engaged with a part of the operating system, A safety device for a dump direction control device in a dump truck, characterized in that the operating portion side and all of the locking claws can be locked.