JPS5851487B2 - Automatic door fastening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic door tightening device for opening and closing a rear door of a dump vehicle in conjunction with the transfer of a loading platform.

When the rear sliding door of a dump vehicle's loading platform is supported without sufficient rigidity in the direction perpendicular to its opening/closing direction, the conventional sliding door fastening device can cause misalignment of both fastening parts. However, since there is no function to correct the position of the sliding door in that direction and then tighten the door, there are inconveniences such as the door being unable to be fastened or the door being fastened in the wrong position.

The present invention has been made to solve the above-mentioned problems, and its gist is to connect the rear sliding door of a dump vehicle to both side sliding doors at its upper end in a detachable and rotatable manner. , latches each having a shaft portion facing the side are provided on both sides of the lower end of the rear sliding door, and metal holders are provided on the loading platform at positions corresponding to the latches, and the holders are attached to the metal shank portions of the latches. A locking piece that can be attached and detached is rotatably provided, and a connecting rod that connects to a rotatable double-arm frame provided on the loading platform is connected to each locking piece, and a connecting rod that connects to a rotatable double-arm frame provided on the loading platform is attached to the double-arm frame. This automatic sliding door fastening device is characterized by a combination of operating mechanisms that operate in conjunction with each other.

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

1 is the underframe of a 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 door provided on the loading platform 2 with a hinge 5 so that it can be opened and closed freely, and 6 is installed at the rear of the loading platform 2. It is a rear fan door.

The rear fan door 6 is provided with a hinge 8 on both sides of its upper end, through which a hinge pin T can be freely inserted and removed, and through this hinge 8, both sides of the upper end are connected to the rear upper ends of the side fan doors 4, and the lower end of the rear fan door 6 is connected. A cantilever-like latch 10 having a shaft portion 9 facing the side is fixed on both sides, and a metal catch 11 is fixed on the loading platform 2 at a position corresponding to both the latch 10. 11 plus 10
A locking piece 12 having a retaining hole that can be fitted into and removed from the shaft part 9 is rotatably attached with a pin 22, and the locking piece 12 has a compound rotatably provided at the bottom of the loading platform 2. The other end of the connecting rod 14 is pivotally connected to the arm rod 13, and an operating mechanism that operates in conjunction with the tilting movement of the loading platform 2 is connected to the double arm rod 13.

Here, the shaft hole of the gold 11 receiver (the shaft hole for rotatably mounting the locking piece 12) is a long hole inclined at an appropriate angle with respect to the rear fan door 6, and this long hole is The locking piece 12 is attached to the hole-shaped shaft hole with a slidable shaft.

In addition, as shown in FIG. 1, the double-arm rod 13 is made up of a second arm rod located in a straight line around a shaft 15 that rotatably supports the double-arm rod 13 on the loading platform 2, and an arm portion perpendicular to this arm portion. Become,
The other ends of the connecting rods 14, which are pivoted to both the locking pieces 12, are pivoted to arm portions of the multi-arm rod 13 located on a straight line, respectively.

One end of the connecting rod 16 of the operating mechanism is pivoted to the remaining arm.

The operating mechanism consists of a return spring 11 interposed between the middle of the connecting rod 14 and the support 11, the connecting rod 16, an arm rod 1B rotatably attached to the loading platform 2, and a lower end of the arm rod 1B. Guide piece 2 having movable rollers 19 and corners 20
1, the other end of the connecting rod 16 is pivoted to the double arm lever 13, and the other end of the connecting rod 16 is pivoted to the upper end of the arm lever 18, and the guide piece 21 is engaged with the roller 19 of the arm lever 18 when the loading platform 2 is not tilted. It is positioned so as to be fixed to the side of the underframe 1.

Since this embodiment is configured as described above, when the loading platform 2 is pushed up and tilted by a pushing up device (such as a cylinder device, etc.) not shown, the rollers 19 first touch the corners 20 of the guide piece 21.
The arm rod 18 rotates backward (in the clockwise direction in FIG. movement), the connecting rod 16 is moved backward, and the double arm rod 13 is rotated counterclockwise in FIG. .

Therefore, the shaft portion 9 of the latch 10 is automatically released from the fastening by the locking piece 12 due to the inclination of the loading platform 2, and the rear fan door 6 rotates around the hinge pin T as the loading platform 2 inclines to the open state. This means that the cargo on the loading platform 2 can be dropped to the ground and unloaded.

Needless to say, the open state of the locking piece 12 is maintained by the tensile force of the return spring 1γ while the loading platform 2 is tilting.

Next, when returning the loading platform 2 from the above-mentioned tilted state to the non-tilting state, first the roller 1
9 makes contact with the guide piece 21 provided on the side of the underframe 1, and as the loading platform 2 descends, the guide piece 21 is moved rearward and the arm rod 18 is rotated forward (counterclockwise rotation in Fig. 2). ), and as a result, the connecting rods 16 and 14 and the multi-arm rod 13 operate in the opposite direction to the case of the transfer tilt of the loading platform 2 described above, and the locking piece 12 closes (from the side to the inside). rotate).

On the other hand, when the loading platform 2 is lowered, the rear fan door 6 rotates closed around the hinge pin T, and its lower end comes into contact with the rear end of the loading platform 2, so that the locking piece 12 closes and the shaft of the latch 10 is closed. The rear fan door 6 can be fastened by engaging the portion 9 with the locking piece 12.

At this time, if the rear sliding door 6 is displaced laterally due to the deflection of the side sliding door 4, the locking piece 12 rotates inward from the row side force until it abuts the side of the loading platform 2, and the latch is engaged. Since it is fitted onto the shaft portion 9 of No. 10 and pressed, the lateral deviation is corrected and the screw is fastened in that state.

In addition, the shaft hole for the shaft of the locking piece 12 of the metal 11 is a long hole at an appropriate angle, so when the locking piece 12 is fitted with the shaft part 9 of the latch 10, the rear fan door 6 is tightened. The attachment can be adjusted automatically.

Further, when the loading platform 2 is not tilted, when the hinge pin 1 is removed from the hinge 8 at the upper end of the rear fan door 6, the shaft portion 9 of the latch 10 at the lower end of the rear fan door 6 is rotatably fitted into the locking piece 12. Since the rear fan door 6 can be opened by rotating around the shaft part 9, large cargo can be easily loaded and unloaded.

Therefore, as can be understood from the description of this embodiment, according to the present invention, not only the intended purpose can be achieved, but also large cargo can be loaded by rotating the rear sliding door downward about the shaft. This has the effect of making wholesale sales possible.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and 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 sectional view taken along line A-A of the same. 1 is the underframe, 2 is the loading platform, 4 is the side fan door, 6 is the rear fan door, γ
is the hinge pin, 8 is the hinge, 9 is the shaft, 10 is the latch, 1
1 is a gold receiver, 12 is a locking piece, 13 is a double arm rod, 14.16
is the connecting rod, 1γ is the return spring, 18 is the arm rod, 1
9 is a roller, 20 is a corner, and 21 is a guide piece.

Claims (1)

[Claims] 1. A rear sliding door of a dump vehicle is removably and rotatably connected to both side sliding doors at its upper end, and latches each having a shaft portion facing the side are provided on both sides of the lower end of the rear sliding door. A metal receiver is provided at the position corresponding to each latch, and this receiver is attached to the metal,
A locking piece that can be attached to and removed from the shaft of the latch is rotatably provided, a connecting rod that connects to a rotatable double-arm rod provided on the loading platform is connected to this locking piece, and the loading platform is attached to the double-arm lever. An automatic sliding door fastening device, characterized in that an operating mechanism that operates in conjunction with the tilting movement of the door is connected.