JPS6234842Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to quickly open the rear door of a dump truck during the dumping operation, thereby making the dumping operation faster and safer.

Generally, in a dump truck, the rear door 1
is opened and closed in conjunction with the lifting and lowering movements of the loading platform by means of a female key 2 having a lower portion thereof, and a male key 5 of an opening/closing mechanism attached to the vehicle body chassis 3 and the loading platform chassis 4. However, during dumping operations, the release of the male and female keys 2 and 5 may not be successful due to the work site environment or other reasons, or even if the connection between the female and male keys 2 and 5 is easily released, such as when the cargo is a large lump. During dumping, the cargo often collides with the rear door 1 and damages it, which has become a source of concern for dump truck owners. Therefore, in order to eliminate this drawback, the rear door 1 is also rotatably attached to the tip of a support arm 7 rotatably provided on the left and right upper edges 6 of the loading platform, and this support arm 7 is linked to the rise and fall of the loading platform. It has been proposed to raise or lower the rear door 1 itself by raising or lowering it or using another means to open it. However, in this case, the rotation of the support arm causes the rear door to open upward instead of rotating backwards, so the keychain does not release properly and becomes stuck, resulting in the rear door being unable to open. I had a problem with not doing it. In particular, since the weight of the rear door 1 is extremely heavy, it is not easy to open the key especially when the work site is a downwardly sloping ground facing the front of the dump truck.

Focusing on this point, the present invention allows the rear door 1 itself to rotate rearward in conjunction with the upward rotational movement of the support arm 7, thereby quickly opening the male and female keys 2 and 2.
5 is released so that the rear door 1 does not become a hindrance to the subsequent upward movement of the rear door 1.

Next, a detailed explanation will be given according to the drawings.

FIG. 1 is a partial side view of the dump truck of the present invention, in which the rear door 1 is rotatably connected to the tip of a support arm 7 rotatably connected to the upper edge 6 of a loading platform 8. 9 is the support arm 7, and 10
are rotational axes of the rear door 1, respectively. Each is a rotation axis of the rear door 1. The opening/closing mechanism of the rear door 1 is not fully illustrated, but 2 is a female key attached to the rear door, and 5 is a male key thereof. 11 is a rotation shaft of the loading platform 8, and 12 is a wire of a support arm rotation mechanism. A triangular extrusion plate 15 is attached to the rear end of the loading platform 8 and at an upper position so as to protrude rearward, and a slider 13 that slides on the extrusion plate 15 is attached to the side surface of the rear door 1.
It is provided at a position where it slides on the lower side 14 of 5.
The slider 13 may be a piece, a rod, a rotating wheel, or the like. This slider 13 is connected to the rotating shaft 1 of the rear door 1.
Since the extrusion plate 15 rotates while drawing a circular arc (trajectory) Y whose radius is the distance r from 0, the lower side 14 of the extrusion plate 15 is formed into a curve of the same arc as this circular arc Y. Reference numeral 11 indicates the rotation axis of the loading platform 8, H indicates the rotation arc (trajectory) of the female key 2 around the rotation axis 10, and Z indicates the rotation arc (trajectory) of the support arm 7. Since the present invention has the above-described configuration, the support arm 7 is rotated in conjunction with the movement of lifting the cargo platform 8, and the rear door 1 is rotated.
When opening the door by raising the support arm 7, the support arm 7 attempts to rotate along the locus of an arc Z around the rotation axis 9.
In this rotational trajectory Z, if the push-out plate 15 is not present, the rotation of the support arm 7 has almost no effect on releasing the connection between the female and male keys 2 and 5, so the female and male keys 2 and 5 are
The only way to release the connection is through the action of the existing opening/closing mechanism, and in this case, the support arm 7 begins to rotate before the male and female locks 2 and 5 are disconnected (this is what happens in most cases on forward slopes). Then, the rear door 1 is pulled upward and the female key 2 is caught on the male key 5, making it impossible to open the rear door 1. However, in the case of the present invention, the lower side 14 of the extrusion plate 15
Since the slider 13 and the slider 13 are in slidable contact with each other, the rear door 1 is prevented from moving upward, and at the same time as the support arm 7 rotates, the rear door 1 follows a trajectory of an arc H around the rolling axis 10. Then, the slider 13 contacts the lower side 14 of the extrusion plate 15 and rotates upward along the trajectory of the arc Y.

By this rearward rotation of the rear door 1, the female key 2 is detached from the male key 5, and the connection between them is released.Then, the slider 13 is detached from the push-out plate 15, and by the rotation of the support arm 7. Therefore, the rear door 1 rises along a trajectory Z.

As described above, in the present invention, when the support arm 7 is rotated about the rotating shaft 9 in conjunction with the rise of the loading platform 8 during dumping, the extrusion plate 15 and the slider 1
3 rotates the rear door 1 toward the rear, making it possible to quickly release the connection between the female and male locks 2 and 5. This makes it possible to quickly release the connection between the female and male locks 2 and 5. Since the rear door can be easily and completely opened and raised before the start of dumping of the cargo, damage to the rear door due to a collision between the rear door and the dumped cargo can be prevented.

[Brief explanation of the drawing]

The drawings show an embodiment, and FIG. 1 is a partial side view of the present invention, and FIG. 2 is a rear view thereof. DESCRIPTION OF SYMBOLS 1... Rear door, 2... Female keypad, 3... Vehicle chassis, 4... Loading platform chassis, 5... Male keychain, 6... Upper edge of loading platform, 7... Support arm, 8... Loading platform, 11 ...Cargo platform rotation axis, 13...
Slider, 14...lower side of extrusion plate, 15...extrusion plate.

Claims (1)

[Scope of utility model registration request] In a dump truck that has a rear door rotatably attached to the tip thereof and a support arm rotatably attached to the left and right upper edges of the dump truck, the rear door is opened and closed by rotating the support arm, and the rear door is opened and closed by rotating the support arm. A dump truck characterized in that an extrusion plate that protrudes rearward is provided at an end, and a slider that contacts a lower side of the extrusion plate is provided on a side surface of the rear door.