JPS6250331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear door opening/closing device for a removable body vehicle.

In conventional removable body vehicles, the rear door of the cargo box opened downward, so when dumping large objects such as iron scraps and rocks, they could become clogged in the rear door and difficult to remove. There was a problem in which the loaded object collided with the rear door, damaging the rear door and its upper hinge.

The present invention solves these problems, allows for smooth and quick ejection of loaded items without damaging the rear door and its hinges, and allows the rear door to open automatically with the dump truck, and furthermore, allows for easy removal from the chassis side. The purpose is to automatically close the rear door when the cargo box is removed.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In FIGS. 1 and 2, reference numeral 1 denotes a cargo box, at the rear of which a rear door 2 is pivotally mounted on a pivot shaft 3 so as to be able to open and close upwards. 4 is a palm, and its palm frame 5
A sub-frame 6 is fixed to the upper part, and a guide roller 7 is pivotally attached to the rear end of the sub-frame 6 by a support shaft 8. 7 and is guided and supported when loading the cargo box 1 onto the chassis 4 side and when removing it from the chassis 4 side. 10 is a first arm whose rear end is pivotally attached to the subframe 6 on a support shaft 8, 11 is a second arm, and 47 is a third arm.
The third arm 47 is shaped like a
A hook portion 13 is formed at the upper end of the cargo box 1, and is hooked onto a hook member 14 protruding from the front wall of the cargo box 1. 49
is a fluid pressure cylinder that swings the third arm 47 about the shaft 48 with respect to the second arm 11 to operate from a perpendicular state to a bent state as shown in FIG. The first and second arms 10 and 11 are connected to the shaft 1.
It is pivotally connected at 2.

15 is another fluid pressure cylinder, whose base end is pivotally connected to the front end of the subframe 6, and whose tip is connected to the second cylinder by a shaft 16.
The second arm 11 is pivotally connected to a part of the arm 11, and when the cylinder 15 expands and contracts, the second arm 11 swings around the shaft 12, and when the cylinder 49 expands and contracts, the second arm 11 swings around the shaft 12.
The arm 47 is bent with respect to the second arm 11, so that the cargo box 1 can be mounted on the chassis 4 side, or conversely detached and lowered onto the floor surface 18 side. By the way, reference numeral 17 denotes a locking/disengaging mechanism interposed between the first arm 10 and the bottom surface of the cargo box 1. When the locking/disengaging mechanism 17 is switched to the locked state as shown by the solid line in FIG.
5, the first arm 10 and the second arm 1
1 and the cargo box 1 are tilted together, and the loaded object can be discharged in a dump state.

3 to 7, one embodiment of the rear door opening/closing device of the above-mentioned removable body car cargo box 1 is shown in detail.

The rear door 2 tilts the rear edge 19 of the side wall of the cargo box 1 slightly downward, and urges the cargo box 1 around the pivot shaft 3 to open upward in the direction of arrow A in the free state. . Further, the deck plate 20 is tilted rearward and upward so that the rear end edge 20a is at the upper and lower middle height of the rear end surface of the cargo box 1, so that the pivot shaft 3
is placed near it at an intermediate height above and below. Further, a triangular protruding piece 21 is formed on the rear door 2.

Reference numeral 22 denotes a swinging arm pivotally mounted near the bottom of the cargo box 1, and in the illustrated example, it is made up of three plates 23... and a boss portion 24, and the boss portion is attached to a rotating shaft 25 horizontally suspended on the cargo box 1. 24 and the swing arm 2 together with the rotating shaft 25.
2 swing together. B is a transmission mechanism for interlockingly connecting the swinging arm 22 and the rear door 2; a spring cylinder 27 pivotally connected to the upper end of the swing arm 26; a bell crank 28 to which the other end of the spring cylinder 27 is pivotally connected;
A transmission mechanism B is constituted by a rod 30 that connects the bell crank 28 and the protruding piece 21 of the rear door 2. Of course, the bell crank 28 is swingably supported at the bottom rear end of the cargo box 1 by a support shaft 31.

Further, 32, 32 is a first roller pivotally mounted near the tip of the swinging arm 22, and specifically, it is divided between three plates 23 and is rotatably pivoted on a shaft 33. It will be worn.

Further, the first roller 32 contacts and rolls on the sub-frame 6 on the side of the chassis 4, and is guided by the first roller 32.
A guide member 34 is provided. This guide member 34
is approximately L-shaped when viewed from the side, and includes a rear end vertical side portion 34a, a rounded portion 34b, and a horizontal side portion 34c.
and a concave arc portion 34d continuously formed in front of the horizontal side portion 34c, as shown in FIG. 32 abuts, and closes the rear door 2 via the swing arm 22 and the transmission mechanism B.

When dumping, the rear door 2 is biased in the direction of opening by its own weight, so →→ in Figure 6.
→Sequentially, the first roller 32 is guided by the concave arc portion 34d of the first guide member 34, and the swinging arm 22 gradually swings. 2 opens, and the deck plate 20 and the inner surface of the rear door 2 become flush with each other as shown in FIG. In FIG. 7, the horizontal axis shows the dumping angle of the cargo box 1 from now on with the running state being 0 degrees, and the vertical axis shows the opening degree θ with respect to the rear edge 19 of the side wall. The rear door 2 is fully opened at a dump angle of about 20 degrees,
It can be seen that it is flush with the deck board 20. Of course, the shape of the arcuate portion 34d of the first guide member 34
The dimensions can be changed freely, and by changing them appropriately, the full opening time can be advanced or delayed as desired.

35 is a hook-shaped locking arm, and the locking arm 35 swingably supports a shaft 36 toward the bottom of the cargo box 1, and is fixed to one end of the shaft 36. Further, a second guide member 38 having a convex arc portion 37 is attached to the rear end of the chassis frame 5 on the side of the chassis 4, and a second roller 39 that rolls in contact with the second guide member 38 is attached. , are interlocked and connected to the locking arm 35 via a link mechanism E. This link mechanism E includes a bell crank 41 pivotally connected to the bottom of the cargo box 1 by a shaft 40, the shaft 36, and a shaft 3.
A swinging arm 42 fixed to the other end of the swinging arm 4
2 and a rod 43 connecting one end of the bell crank 41. And bell crank 41
A second roller 39 is rotatably attached to the other end by a pin 44.

Reference numeral 45 denotes a resilient member made of a coil spring, which pulls the locking arm 35 so as to swing downward elastically. 35 engages with the first roller 32 to prevent the first roller 32 from swinging around the shaft 25, thereby preventing the rear door 2 from opening. Conversely, if the cargo box 1 is loaded from the rear of the chassis 4, the second roller 39 comes into contact with the second guide member 38, swings in the direction of arrow F, and locks the locking arm 35 via the link mechanism E. The first roller 32 is disengaged from the first roller 32.

During the above operation, immediately before the second roller 39 comes into contact with the second guide member 38, the first roller 32 first touches the rounded portion 3 of the first guide member 34.
4b (spring cylinder 27 stretches a little), a slight gap is created between the locking arm 35 and the first roller 32, and then as the cargo box 1 moves forward, the second roller 39 moves as shown in FIG. The locking arm 35 is pushed up between the imaginary line and the solid line, and the locking arm 35 is pulled up via the link mechanism E, and the locking arm 35 and the first roller 3
2, and the horizontal side portion 34c of the first guide member 34 takes over the role of closing the rear door 2.
will be done.

Further, in FIG. 6, the loading box 1 is gradually tilted to a larger dumping angle.
7, there is almost no relative movement between the packing box 1 and the link mechanism E, and the locking arm 35 maintains an open state with respect to the first roller 32.

It should be noted that the present invention is free to change the design other than the illustrated embodiment, and it is possible to provide the swinging arm 22 with a roller other than the first roller 32, or to provide a pin or a protruding member on the swinging arm 22. For rollers, pins, protruding parts, etc.
It is also free to engage the locking arm 35. Alternatively, it is preferable to directly engage a part of the swinging arm 22. The transmission mechanism B is not placed below the deck plate 20,
It is also preferable to arrange them mainly along the outer sides of the left and right side walls of the packing box 1. Further, the first roller 32 is moved from the rounded portion 34b of the first guide member 34 to the linear horizontal side portion 3.
Instead of the above embodiment in which the first roller 32 is disengaged from the locking arm 35 by riding on the horizontal side portion 34c, the first roller 32 is directly mounted on the horizontal side portion 34c and disengaged from the locking arm 35 here. It is also desirable to omit the spring tube 27. Also, the second guide member 3
If a convex arc portion 37 is formed on the locking arm 35
Although it is preferable that there is no relative movement with the packing box 1, it does not necessarily have to be in an arc shape. It is also preferable that the rear edge 19 be vertical as shown in FIG. Further, as shown in FIG. 1, since the third arm 47 is bent around the shaft 48 by the expansion and contraction of the cylinder 49, the horizontal movement of the cargo box in the direction of arrow H in FIG. The rocking engagement operation is performed reliably and smoothly. Of course, in addition to this illustrated embodiment, it is also possible to omit the cylinder 49 and make the second and third arms 11 and 47 integrally L-shaped, and in this way the cargo box 1 can be lowered from the rear. , the second roller 39 is connected to the second guide member 38
Even if the locking arm 35 is brought into contact with the locking arm 35, the locking arm 35 will surely operate.

As described in detail above, the present invention provides the rear door 2 of the cargo box 1.
The swinging arm 22 pivotally mounted near the bottom of the cargo box 1 and the rear door 2 are interlocked and connected via the transmission mechanism B, and the swinging arm 22 is opened and closed at the top. A first roller 32 is pivotally attached to the rear door 2, and a first guide member 34 is provided on the chassis 4 side to which the first roller 32 is guided as it rolls against the rear door 2. Moreover, during dumping, the rear door 2 is guided to open until it is flush with the deck plate 20, and is engaged with the swinging arm 22 by the resilient force of the resilient member 45 when the cargo box is released. A locking arm 35 is swingably pivoted near the bottom of the cargo box 1, and a second guide member 38 is attached to the rear end on the chassis 4 side. If the second roller 39 is interlocked and connected to the locking arm 35 via the link mechanism E, and the cargo box 1 is loaded from the rear of the chassis 4, the second roller 39 and the second guide member 38 will be connected to each other. Since the locking arm 35 is configured to disengage from the swinging arm 22 via the link mechanism E upon contact,
The rear door 2 opens and closes automatically with the dump truck, and when opened upward, it becomes flush with the deck board 20, so that even large loads can be smoothly slid on the rear door 2 and ejected. It is possible to effectively prevent damage to the pivot shaft, and when the cargo box 1 is removed from the chassis 4 side, the rear door 2 is reliably closed, which is desirable from a safety standpoint. , the components that perform the closing action are automatically replaced from the locking arm 35 to the first guide member 34, and the rear door 2 is reliably closed even in the running state, which is preferable for safety.
Moreover, the rear door 2 can be reliably opened by the first guide member 34 together with the dump truck.

[Brief explanation of the drawing]

Figures 1 and 2 are simplified side views for explaining the operation of a removable body vehicle, Figure 3 is a side view showing an embodiment of the present invention, Figure 4 is an enlarged view of the main parts, and Figure 5 is a rear view. FIG. 6 is a simplified side view for explaining the operation, and FIG. 7 is a diagram showing the opening degree of the rear door with respect to the dumping angle. B... Transmission mechanism, E... Link mechanism, 1... Loading box, 2... Rear door, 4... Chassis, 20... Deck board, 22... Swinging arm, 32... First roller, 34
...First guide member, 35...Locking arm, 38
...Second guide member, 39...Second roller, 45
...Bullet parts.

Claims (1)

[Claims] 1 The rear door 2 of the packing box 1 can be opened and closed upwards, and the swinging arm 22 is pivoted near the bottom of the packing box 1.
and the rear door 2 are interlocked and connected via a transmission mechanism B, and a first roller 32 is pivotally mounted near the tip of the swinging arm 22. Furthermore, the first roller 3 is mounted on the chassis 4 side.
2 is guided by contacting and rolling.
is provided to guide the rear door 2 so as to close it during driving and to open it until it is flush with the deck plate 20 during dumping, and to close the rear door 2 during dumping, and to close the swing arm 22 when the cargo box is released. The locking arm 35, which is engaged by the resilient force of the resilient member 45, is swingably pivoted near the bottom of the cargo box 1, and the chassis 4
A second guide member 38 is attached to the rear end of the side, and a second roller 39 rolls in contact with the second guide member 38.
is interlocked and connected to the locking arm 35 via the link mechanism E, and when the cargo box 1 is loaded from the rear of the chassis 4, the second roller 39 and the second guide member 38
A rear door opening/closing device for a removable body vehicle, characterized in that the locking arm 35 is disengaged from the swing arm 22 via the link mechanism E upon contact with the swing arm 22.