JPS5914581A - Tail gate of truck - Google Patents

Abstract

PURPOSE:To ensure that a tail gate is always opened and closed smoothly and lightly and enhance operating efficiency, by providing a bite-in preventing member between an end edge of a rear body and a base end of the tail gate. CONSTITUTION:An elastic cover 35 consisting of a rubber material or the like is fixed at the rear end edge of the rear body 2 over the entire transverse length thereof except hinge parts H for a tail gate 4. The cover 35 is substantially angular in cross-sectional shape, and is provided with an eaves piece 35a extended backward so as to cross a part beneath the gate 4, and the upper surface of the eaves piece 35a is close to the base end edge of the tail gate 4 and is formed as a downwardly slanted surface along the locus of the base end edge of the tail gate 4 at the time of opening or closing the gate 4. When opening or closing the tail gate 4, the gap between the rear edge of the rear body 2 and the base end face of the tail gate 4 is closed by the cover 35, so that a loaded material such as earth can not be bitten into the gap, and the tail gate 4 can be smoothly opened or closed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding door device for a freight vehicle such as a dump truck or a cargo trunk.

For freight vehicles such as dump trucks, a top-opening type fan in which the base end of the fan door is pivoted on the edge of the cargo box with a substantially horizontal pivot shaft, and the fan door is opened and closed up and down around the pivot axis. A sliding door device is known, but in this type of sliding door device, when the sliding door is opened and closed, a gap is formed between the base end of the sliding door and the edge of the cargo box. earth and sand,
Sand and gravel may get stuck in the door, making it difficult to open and close the fan door smoothly.
There is an inconvenience that it becomes difficult to open and close.

Therefore, the present invention provides a jamming prevention member between the edge of the cargo box body and the base end of the sliding door, and this member prevents loaded objects such as earth and sand from getting caught in the gap between the cargo box and the sliding door. The main object of the present invention is to provide a sliding door device for a freight vehicle, which has a simple structure and eliminates the disadvantages of the conventional device.

First, a conventionally known swing door device for a rear dump truck will be explained with reference to FIG.

A cargo box 2 is mounted on the rear end of a body frame 1 of a rear dump truck so as to be tiltable rearward with a hinge shaft.

Further, at the rear end of the cargo box 2, a rear sliding door 4 is pivotally supported via a hinge portion H so as to be able to open and close upward. Next, the hinge part H
To explain the structure, a plurality of fixed side brackets 5 are provided on the rear end edge of the cargo box 2 at intervals in the lateral direction, and a plurality of fixed side brackets 5 are provided on the base end of the rear sliding door 4. A plurality of movable side brackets 6 are protruded at intervals in the lateral direction corresponding to the brackets 5, 6, and the hinge shaft 3 is inserted through the brackets 5.6, and the rear fan door 4 extends around the hinge shaft 3. Can be opened and closed.

Between the rear sliding door 4 and the cargo box 2, there is a device that automatically closes the rear sliding door 4 when the cargo box 2 is tipped over, and automatically opens the rear sliding door 4 when the loading box 2 is tilted. A bell crank 8 is pivotally supported 9 on one side of the main girder 7 of the cargo box 2 so as to be rotatable up and down, and a roller 10 is attached to the tip of one arm 8α of the bell crank 8. is rotatably supported on a shaft, and this roller 10 comes into contact with a stopper 11 fixed to the vehicle body frame 1 when the cargo box 2 is laid down. The front end of the transmission rod 12 is connected with a pin 13 to the tip of the arm body 8h.
2, a buffer cylinder 14 is interposed in the middle thereof, and a tension spring 15 is stretched between the transmission rod 12 and the cargo box 2, and the spring force of the tension spring 15 causes the transmission rod 12 to move into the cargo box. 2 (to the right in Figure 1). Transmission rod 1
2, the upper end of a swinging lever 16 that is pivoted 17 to the main girder 7 so as to be able to swing up and down about a horizontal axis is connected with a pin 18, and the lower end of this swinging lever 16 is connected to a transmission link 19. A pin connection 20 is provided at the front end. At the rear end of the transmission link 19, the front end of a floating link 27, which is pin-coupled 25° 26 to the lower ends of parallel links 21 and 22 that are pivoted 23 and 24 on the main girder 7, is connected with a pin 28. The lower end of the connecting link 29 is connected with a pin 30 at the rear end, and when the upper end of the connecting link 29 is fixed to the rear surface of the base end of the rear fan door 4, the roller at the rear end of the bell crank 8 is fixed. 10
is brought into contact with the stopper 11, and the transmission rod 12 is pulled forward of the cargo box 2 by the bell crank 8 against the tensile force of the tension spring 15, and the swing lever 16, transmission link 19, and floating link are 27 and the connecting link 29 to hold the rear fan door 4 in the closed position.

Next, the loading box 2 is opened by the extension operation of the dump cylinder (not shown).
is tilted backward around the hinge axis, and when the tilt angle exceeds a certain angle, the roller 10 comes to separate from the stopper 11. As a result, the transmission rod 12 has a tension N\spring 1
The loading box 2 is pulled rearward by the traction force of 5 and swings, and the floating link 27 is moved to the loading box 2 via the transmission link 19.
It is moved forward, the rear sliding door 4 is opened, and this rear sliding door 4 is rotated to the hanging position.

Further, when the cargo box 2 is brought down from the tilted state onto the vehicle body frame 1, the rear door swing door 4 is closed by an operation opposite to that described above.

By the way, when the rear sliding door 4 is opened and closed in conjunction with the raising and lowering operation of the loading box, a gap is formed between the rear end edge of the loading box 2 and the rear sliding door 4, as shown in the lost line in Figure 1. There is a possibility that loaded materials such as earth, sand, gravel, etc. may get caught between them, preventing smooth opening and closing of the rear fan door 4, and making it difficult to open and close.

The present invention is capable of reliably preventing such jamming of loaded objects, and first, a first embodiment of the present invention will be described with reference to FIGS. 2 and 3.

An elastic cover 35 made of rubber, synthetic resin, or the like is fixed to the rear edge of the cargo box 2 over its entire width, except for the hinge H with which it connects to the rear sliding door 4. This elastic cover 3
5 has an eaves piece 35α formed in a substantially angular cross section and extending rearward so as to cross directly under the rear fan door 4, and the upper surface of this eaves piece 35α is not close to the base edge of the rear fan door 4. The tip of the rear fan door 4 is formed into a downwardly sloped surface that follows the locus of movement of the base edge when the rear fan door 4 is opened and closed.

As shown in the chain line in Figure 2, when the rear fan door 4 is opened or closed, the cargo box 2
Since the gap between the rear end edge and the base end surface of the rear fan door 4 is closed by the elastic cover 35, there is no worry that loaded materials such as earth, sand, gravel, etc. will get caught between them (the rear fan door 4 can be smoothly moved). Opening and closing can be guaranteed.

FIG. 4 shows a second embodiment of the invention. In this second embodiment, a rigid plate 36 such as a rigid plate is attached to the upper surface of the elastic cover 35 of the first embodiment, so that earth and sand are resistant to dirt and sand on the elastic cover 35 made of rubber or synthetic resin. This makes it difficult for the elastic cover 35 to get attached and protects the elastic cover 35.

5 and 6 show a third embodiment of the device of the present invention. In this third embodiment, a bag-shaped elastic cover 37 made of rubber or synthetic resin is fixed to the entire width of the rear sliding door 4 except for the hinge H.

This elastic cover 37 extends directly below the rear sliding door 4 in the closed position, and its upper surface is formed into an arcuate surface that follows the arcuate locus of its base edge as the rear sliding door 4 is opened and closed. This third embodiment is also the same as the first embodiment.

As in the second embodiment, when the rear fan door 4 is opened and closed, the gap between the rear end face of the cargo box 2 and the rear fan door 4 is closed, and earth and sand are removed between them.
A load such as sand and gravel will not get caught (1 degree).A fourth embodiment of the present invention is shown in FIGS. 7 and 8.

In this fourth embodiment, a plurality of elastic bushings 38 made of an elastic material such as a rubber material or a synthetic resin material are attached to a plurality of fixed side brackets 5 which are fixed to the rear end edge of the packing box 2 at intervals in the lateral direction. The hinge shaft 3 is supported through the elastic bushing 38, and the movable bracket 6 at the lower end of the sliding door 4 is pivotally supported on the hinge shaft 3.

A cover 39 is attached to the fixed side bracket 5 excluding the hinge portion H from the upper surface to the rear surface thereof.

When the rear sliding door 4 is opened and closed, if a load such as earth and sand is caught between the rear end edge of the loading box 2 and the base end of the rear sliding door 4, the elastic bushing 38 is elastically deformed and the loading box 2 is closed. The gap between the rear end edge and the base end of the rear sliding door 4 is widened, so that the interposed earth and sand does not fall easily and get caught between them.

9 and 10 show a fifth embodiment of the device of the present invention.

In this fifth embodiment, an extension piece 42 that slopes downward is formed on the rear end edge of the deck 40 of the packing box 2 over the entire lateral direction thereof except for the hinge portion H, and the rear end edge of the packing box 2 is provided with a cover 41 that corresponds to the extension piece 42 and extends below it.

When the rear sliding door 4 is opened or closed, the extension piece 42 and the cover 41 work together to close the gap between the rear edge of the cargo box 2 and the base end of the rear sliding door 4, so that loaded materials such as earth and sand can be prevented from entering between them. Prevent biting.

Furthermore, FIGS. 11 and 12 show a sixth embodiment of the invention. In this sixth embodiment, below the rear sliding door 4 in the closed position, the rear end edge of the deck 40 of the loading box 2 is extended rearward downward in an arc shape, excluding the hinge part H of the rear sliding door 4. A piece 43 is extended, and its upper surface is formed into an arcuate surface centered on the hinge shaft 3. On the other hand, an elastic body 44 made of a rubber material, a synthetic resin material, etc. is fixed to the base end of the rear sliding door 4, and this elastic body 44 is brought into contact with the arcuate extension piece 43. As a result, the gap between the rear end edge of the rear sliding door 4 and the deck 40 of the cargo box 2 is closed, and loads such as earth and sand are not caught between them when the rear sliding door 4 is opened and closed.

Of course, it can also be applied to a dump truck or a regular cargo trunk.

As is clear from the above embodiments, according to the present invention, the base end of the sliding door is pivotally supported on the edge of the packing box by a hinge shaft, and the sliding door can be opened and closed around the hinge shaft. In a sliding door device for a rental car having a swinging door, a jamming prevention member that prevents a load such as earth and sand from getting caught between the edge of the packing box and the base end of the sliding door. Since this is provided, there is no risk of loaded materials such as dirt and gravel getting stuck in the gap between the door and the cargo box when the door is opened and closed, and the door can always be opened and closed smoothly and easily. Not only can work efficiency be greatly improved, but also damage to the sliding door and its hinge can be prevented.

[Brief explanation of the drawing]

Figure 1 is a side view of a part of a conventional rear dump truck;
3 shows the first embodiment of the device of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a view taken along the line 1.11 in FIG.
The figure shows a side view of the second embodiment of the device of the present invention, and Figures 5 and 6 show the third embodiment of the device of the present invention. 7 and 8 show a fourth embodiment of the device of the present invention, FIG. 7 is a side view thereof, and FIG. 8 is a side view thereof.
The figure is a view taken from the X-ray arrow in FIG. 9, FIGS. 9 and 10 show a fifth embodiment of the device of the present invention, and FIG. 11 and 12 show a sixth embodiment of the device of the present invention, and FIG. 11 is a side view thereof, and FIG.
FIG. 2 is an X-ray arrow view in FIG. 2... Loading box, 3... Hinge shaft, 4... Rear sliding door,
35... Elastic cover, 36... Rigid plate, 37...
Elastic cover, 38... Rubber bush, 41... Cover, 42... Extension piece, 43... Extension piece, 44...
Elastic body. Patent applicant ShinMaywa Industries Co., Ltd.

Claims (1)

[Claims] In a truck door device for a freight vehicle having an upwardly swinging door, the base end of the door is pivotally supported on the edge of the cargo box by a hinge shaft, and the door can be opened and closed around the hinge shaft. This door device for a freight vehicle is provided with a jamming prevention member disposed between the edge of a box and the base end of the door to prevent loaded objects such as earth and sand from getting caught between them.