JPS582857B2 - Automatic door fastening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic door fastening device for tightening a rear door of a dump vehicle while correcting its lateral deviation.

If the rear sliding door of a dump vehicle's loading platform is supported without sufficient rigidity in a direction perpendicular to its opening/closing direction, the conventional sliding door automatic fastening device will cause the sliding door to shift in that direction. Since there is no function to correct the position of the sliding door and tighten it, there are inconveniences such as the mutual positional deviation of the fastening parts making it impossible to fasten the door, or the fact that the fastening part may be fastened with the position misaligned.

The present invention was made with the aim of solving these problems, and its gist is to make the rear sliding door of a dump vehicle rotatable and detachable at its upper end to both side sliding doors. A pair of latches with shafts facing outward are provided at the lower end of the rear fan door, and a holder having a long hole facing perpendicular to the shank of the latches is fixed to the loading platform. When a locking piece having a long hole that engages with the shaft portion is fixed to the long hole in the gold, the locking piece is equipped with an actuation mechanism that operates the locking piece in conjunction with the transfer of the loading platform. This is an automatic sliding door fastening device that is characterized by being connected.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is the underframe of the dump vehicle, 2 is a loading platform provided on the underframe 1 with a dump hinge 3 so that it can be raised and lowered, 4 is a side sliding door attached to the loading platform 2 with a hinge 5, and 6 is a rear section provided at the rear end of the loading platform 2. It's a fan door.

The upper end of the rear fan door 6 is connected to the rear upper ends of the side fan doors 4 via a hinge 8 with a hinge pin 7 that can be freely attached and removed, and the lower end of the rear fan door 6 has a shaft portion 9 facing outward. A pair of latches 10 are fixedly installed, and a receiver 11 is fixedly installed at the rear of the other loading platform 2 at a position corresponding to each of the latches 10. A long hole 12 having a long diameter in the direction of One end of a connecting rod 15 of an operating mechanism is pivoted to the inner end of the piece 14.

The operating mechanism includes the connecting rod 15, the return spring 16,
It consists of an arm rod 17, a roller 18, and a guide piece 20 having a corner 19. A return spring 16 is interposed between the connecting rod 15 and the support 11, and the front end of the connecting rod 15 is connected to the arm by a pin 21. The arm rod 17 is rotatably connected to the upper end of the rod 17, and the arm rod 17 is rotatably connected to the loading platform 2 at the center of its tenon. A guide piece 20 for guiding the roller 18 is fixed to the frame 1.

In the figure, 22 is a stopper that stops the locking piece 14 provided on the receiving plate 11 at the engagement completion position when the locking piece 14 is engaged with the latch 10, 23 is a pin that is engaged with the elongated hole 12, and 24 is a connecting rod 15.
This is the pin at the rear end of the .

Since this embodiment is configured as described above, when the loading platform 2 is rolled and tilted by a push-up mechanism (for example, a cylinder mechanism, not shown), the rollers 18 are pushed away to the corner 19 when the loading platform 2 begins to tilt. The roller 18 moves forward on the guide piece 20 as the inclination angle becomes narrower.
is detached from the guide piece 20, and the arm rod 17 is completely free to rotate, so the arm rod 1 is rotated by the action of the return spring 16.
7 is rotated backwards and the connecting rod 15 is moved backwards, and the locking pieces 14 are rotated outward, respectively, and the elongated holes 13 are connected to the latch 10.
from the shaft part 9.

Therefore, the rear sliding door 6 can freely rotate around the hinge pin 7 of the hinge 8, and the rear part can be opened as the loading platform 2 is tilted, allowing cargo to be unloaded.

(That is, the cargo is allowed to fall from the cargo platform to the ground through the open lower end of the rear sliding door 6.

) At this time, it goes without saying that the released state of the shaft portion 9 of the latch 10 and the locking piece 14 is maintained by the return spring 16.

Next, when the loading platform 2 is lowered, the roller 18 first moves to the guide piece 2.
0 and rolls backward, the arm rod 17 is rotated forward against the return spring 16, the connecting rod 15 is moved forward, and the locking piece 14 is thereby rotated inward.

On the other hand, when the loading platform 2 is lowered and the rear sliding door 6 is in a non-tilting state, its lower part is in contact with the loading platform 2, so that the locking piece 1
The elongated hole 13 of 4 fits into the shaft part 9 of the latch 10, and the rear fan door 6
can be concluded.

When the rear fan door 6 is fastened as described above, if the rear fan door 6 shifts laterally, the locking piece 14 pivots from the outside to the inside.
The latch 10 in the shift direction is pushed until the rotation of the locking piece 14 is stopped by the stopper 22, and the shift is corrected, and fastening is performed simultaneously with this position correction.

In addition, since the shaft of the locking piece 14 is slidable in the long diameter direction of the long hole 12 of the holder 11, the loading platform 2 of the rear fan door 6
The connection to can be adjusted.

On the other hand, when the hinge pin 7 of the hinge 8 at the upper end of the rear fan door 6 is pulled out while the loading platform 2 is not tilted, the shaft 9 of the latch 10 can freely rotate into the elongated hole 13 of the locking piece 14 in this state. Since it is supported, the rear fan door 6 can be opened using the shaft portion 9 as a fulcrum.

As can be understood from the description of the embodiments above, the present invention not only satisfactorily achieves the intended purpose, but also makes it possible to open using the shaft 9 of the rear fan door as a fulcrum when the loading platform is not tilted. be.

[Brief explanation of the drawing]

FIG. 1 is a partial schematic plan view of a dump vehicle to which the present invention is applied, and FIG. 2 is a schematic side view of the same. 1 is the underframe, 2 is the loading platform, 4 is the side fan door, 6 is the shaft fan door, 7
is the hinge pin, 8 is the hinge, 9 is the shaft, 10 is the latch, 1
1 is a receiver, 12 and 13 are long holes, 14 is a locking piece, 15 is a connecting rod, 16 is a return spring, 17 is an arm rod, 18
is a roller, 19 is a corner, and 20 is a guide piece.

Claims (1)

[Claims] 1. A rear sliding door of a dump vehicle is provided at its upper end to be rotatable and detachable from both side sliding doors, and a pair of latches with shafts facing outward are provided at the lower end of the rear sliding door, and a pair of latches are provided at the lower end of the rear sliding door, and In this case, a receiver having a long hole facing perpendicular to the shaft of the latch is fixed, and a locking piece having a long hole that engages with the shaft is fixed to the long hole of the receiver. An automatic sliding door fastening device, characterized in that the locking piece is connected to an operating mechanism that operates the locking piece in conjunction with the transfer of the loading platform.