Dump truck gate handle, and dump truck

Abstract

To provide a handle for a flap door of a dump truck which reduces a weight load of the flap door with respect to an automatic door opening and closing mechanism upon unlocking of an unlocking device, reduces a load upon release operation of the flap door and prevents accident due to urgent fall-down of the flap door.SOLUTION: A handle 22 for a flap door of a dump truck, in the flap door 5 provided so as to be openable upward, which is provided on the rear surface of the flap door, has: an automatic opening and closing mechanism which connects a loading space 4 with the flap door while supporting the weight of the flap door, and opens and closes the flap door in conjunction with a tilting operation of the loading space; and an unlocking device which can manually release the flap door by unlocking the conjunction function with the loading space by releasing the support of the weight of the flap door on the automatic opening and closing mechanism.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a gate handle provided on a gate of a dump truck, and to a dump truck. [Background technology]

[0002] A dump truck is a truck that has a cargo box mounted on a body frame that can hold cargo such as gravel, and the cargo can be discharged from the cargo box all at once by tilting the cargo box backward and opening the gate door that constitutes the rear wall of the cargo box. If the dump truck is equipped with a linkage mechanism that automatically opens the gate door in conjunction with the tilting of the cargo box, there is no need to separately open the gate door immediately before and after the movement of the cargo box during the cargo discharge work, which reduces the number of workers and increases safety during the cargo discharge work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-294074 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, even in a dump truck equipped with the above-mentioned gate door interlocking mechanism, there are cases where the gate door needs to be opened when the cargo box is horizontally placed on the vehicle frame and the truck is ready to travel. In such cases, the gate door must be opened and closed manually after first releasing the interlocking mechanism with the cargo box. However, because the gate door of a dump truck is heavy, there is a problem that opening the door while releasing the interlocking mechanism is dangerous. [Means for solving the problem]

[0005] Therefore, as a means for solving the above-mentioned problems, the handle for a gate of a dump truck (hereinafter sometimes referred to as a handle) of the present invention is mounted on the body frame of the dump truck so as to be tiltable, and is provided at the opening of a cargo box having an opening at its rear end so as to be able to open upwards, and is characterized in that the handle is provided at the rear surface of the gate, which has an automatic opening / closing mechanism that connects the cargo box and the gate while supporting the weight of the gate, and opens and closes the gate door in conjunction with the tilting action of the cargo box, and a release device that releases the support of the weight of the gate door in the automatic opening / closing mechanism, thereby releasing the linking function with the cargo box and allowing the gate door to be manually opened, and has a substantially horizontal underside when the gate door is inclined rearward and in a closed state.

[0006] It is also preferable that the handle is provided so as to extend rearward from the rear surface of the gate.

[0007] Furthermore, it is also preferable that the handle is a long rod along the side of the gate. By forming the handle as a long rod along the side of the gate, even if the worker's attention is directed downward to release the automatic opening and closing mechanism, which is a mechanism for linking the gate and the packing box and is usually provided below the gate, the worker can reliably grab the handle by stretching one hand upward along the gate without directly seeing the handle. Furthermore, by providing the handle with a length that spans both the left and right ends of the gate, the worker will not miss the handle if he or she stretches his or her hand upward while touching the gate.

[0008] Furthermore, it is preferable to have a gap between the handle and the rear surface of the gate door, because by inserting a finger into the gap, the weight of the gate door can be securely received by the palm of the hand, preventing the gate door from suddenly coming off from the worker's hand.

[0009] It is also preferable that the handle has a tip that protrudes outward from the side end of the gate door, and that the tip can abut against the rear end surface of the side wall of the packing box when the gate door is in the closed position. The tip can be engaged with the rear end of the side wall of the packing box when the open gate door is closed, preventing the gate door from falling into the packing box. It is preferable that the tip forms a small gap between the rear end surface of the side wall of the packing box when the gate door is in the closed position. When the gap is formed between the tip and the rear end surface of the side wall of the packing box, the gate door can be slightly lifted by gripping the handle just before manually opening it, and the load on the release device of the automatic opening and closing mechanism can be easily reduced.

[0010] Furthermore, the automatic opening and closing mechanism comprises an arm having a tip end rotatably supported against the bottom of the packing box and having a joint at a middle portion which can be bent or extended; a support member fixed to the rear surface of the gate and rotatably connected to the tip end of the arm; a long hole formed in the support member along the rear surface of the gate; a pin provided at the other end of the arm and inserted into the long hole so as to be rotatable around the axis; and a fixed arm having a base end rotatably attached to the support member in the vertical direction and supporting the weight of the gate by fitting the protruding portion of the pin from the long hole into a notch formed at the tip end, and it is also preferable that the release device is a handle provided on the fixed arm and capable of rotating the fixed arm in a direction to release the notch from the pin.

[0011] The dump truck according to the present invention is characterized in that it is provided with the gate door handle. Effect of the Invention

[0012] According to the present invention, by pressing the palm of the hand against the handle and pushing the gate door in a closed state diagonally from the rear downward toward the front, the weight load of the gate door on the automatic opening and closing mechanism when the release device is released is reduced, the burden during the gate door release operation is reduced, and an accident caused by the gate door suddenly falling over is prevented.

[0013] In addition, since the handle extends from the rear surface of the gate and is a long rod, the gate can be pressed reliably from diagonally below and behind, making it easier for the weight of the gate to be supported by hand.

[0014] Furthermore, since the end of the handle is formed as a tip that protrudes outward from the side end of the gate door, it is possible to prevent the gate door from accidentally falling into the shipping box when the handle is lifted to close the gate door.

[0015] Furthermore, due to the gap formed between the tip and the rear end face of the side wall of the packing box, when trying to open the gate door, the gate door can be slightly lifted while holding the handle, reducing the load on the release device that releases the automatic opening and closing mechanism and improving the reliability of the operation of the release device. By improving the reliability of the operation of the release device, it becomes easier to move on to the gate door opening operation after operating the release device, and it is possible to prevent accidents caused by the gate door opening unexpectedly.

[0016] In addition, since the weight support structure of the gate door is a fit of a notch and a pin, it is possible to avoid malfunctions such as fine sand or the like becoming caught in the weight support structure of the gate door, causing the release device to suddenly become unable to be released. [Brief description of the drawings]

[0017] [Figure 1] 1 is a side view showing the entire dump truck 1, and a partially enlarged view showing the surrounding area of ​​a gate door handle 22, which is shown surrounded by a two-dot chain line. [Diagram 2] 2 is a partially enlarged cross-sectional view seen from the side, showing an overview of the cargo box 4 and the gate door 5 while the vehicle is moving. [Diagram 3]This is an enlarged partial cross-sectional view taken from the side, showing an overview of the gate door 5 when the packing box 4 has tilted and been released by the automatic opening / closing mechanism 8. [Figure 4] 1 is a partially enlarged cross-sectional view seen from the side, showing an overview of the gate door 5 in a state in which the interlocking function of the automatic opening / closing mechanism 8 has been released, in a cargo box 4 in a traveling state. [Diagram 5] 2 is a partially enlarged view of the rear surface of the dump truck 1, showing an example of a gate door handle 22. FIG. [Figure 6] 13 is a partially enlarged view of the rear surface of the dump truck 1, showing another example of the gate door handle 22. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In this specification and the drawings, components having substantially the same functional configurations are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0019] As shown in the side view of the entire dump truck 1 in Figure 1, the dump truck 1 is tiltably mounted on a body frame 2, and is provided with a gate 5 that is arranged to be able to open upward at the opening 3 of a cargo box 4 having an opening 3 at its rear end.

[0020] When closed, the gate door 5 is installed in a state inclined toward the rear as shown in Fig. 2. The lower end of the gate door 5 can be opened while inclining toward the rear as shown in Figs. 1 and 2 via a base shaft 7 that can change the inclination angle of the gate door 5 while the inner surface 5a of the gate door 5 is almost continuous with the bottom surface 6 of the packing box 4.

[0021] Furthermore, an automatic opening / closing mechanism 8 is provided, which passes from the lower half of the rear surface of the gate door 5 under the packing box 4 and is connected to the underside of the packing box 4. The automatic opening / closing mechanism 8 connects the packing box 4 and the gate door 5 while supporting the weight of the gate door 5, and can automatically open and close the gate door 5 in conjunction with the tilting movement of the packing box 4, as shown in FIG.

[0022] The automatic opening / closing mechanism 8 is composed of an arm 10 connected to a fixed base 9 on the underside of the packing box 4, extending backward and capable of being bent up and down, and a support member 12 that is supported rotatably by being inserted into a pin 11 protruding laterally from the tip of the arm 10. The arm 10 is composed of an arm 10a connected to the fixed base 9, and a connecting rod 10c that is connected to the arm 10a via a joint 10b so that the arm 10a can be bent up and down, and the pin 11 used for connecting to the support member 12 is protruding from the side of the tip of the connecting rod 10c. The support member 12 is fixed to the rear surface of the lower half of the gate 5, and the pin 11 is inserted into a long hole 13 that opens to the side and is formed along the rear surface of the gate 5. The arm 10a and the underside of the packing box 4 are connected to each other so that they can be rotated up and down in conjunction with the tilting of the packing box 4, as shown in Figures 2 and 3. In addition, an abutment plate 14 is provided to extend rearward from the rear end of the packing box 4, slightly below the gate door 5. The abutment plate 14 abuts and supports the open gate door 5 from below, thereby preventing the gate door 5 from excessively falling down.

[0023] The support member 12 is composed of a base 15 fixed to the rear surface of the gate 5, and a support rod 17 connected to the upper end of the base 15 via a pivot pin 16 and hooked onto a pin 11 extending downward and protruding from the lower end of the base 15. In this embodiment, the tip of the support rod 17 is bifurcated toward the front to form a gripping portion 18 formed in a notched shape, and the pin 11 is fitted into the gripping portion 18 to hook it.

[0024] Furthermore, a lock lever 19 that can rotate up and down is provided on the side of the tip of the support rod 17 at the outer edge of the gripping portion 18. When the lock lever 19 is pushed in while rotating it forward, a bifurcated notch 20, similar to the gripping portion 18, fits into the pin 11, and the support rod 17 can be locked so as not to come off the pin 11. A handle 21 is provided at the tip of the lock lever 19, which protrudes further toward the tip than the support rod 17 in the locked state, and the lock lever 19 and the handle 21 together constitute a release device. When the handle 21 is gripped and the lock lever 19 is pulled toward the user, the lock is released, and when the handle 21 is pulled further, the support rod 17 can be released from the pin 11 as shown in FIG. 4.

[0025] When the support rod 17 is released from the pin 11, the automatic opening / closing mechanism 8 is released from supporting the weight of the gate door 5, thereby releasing the interlocking function with the packing box 4 and activating the release device, which allows the gate door 5 to be manually released. The gate door 5, which has been released from interlocking with the automatic opening / closing mechanism 8 by the activation of the release device, can be manually released regardless of the state of the packing box 4, as shown in Figure 4. At this time, as the support rod 17 is released from the pin 11, the pin 11 slides backward along the hinge 13, and the support member 12 operates independently of the connecting rod body 10c, allowing the gate door 5 to open while falling backward.

[0026] Here, a gate door handle 22 is provided at the upper end of the rear surface of the gate door 5, extending rearward from the rear surface of the gate door 5. The gate door handle 22 is formed as a long rod along the side of the gate door 5, as shown in FIG. 5. The gate door handle 22 is welded to the gate door 5 at both left and right ends 22b, and the central portion 22a is bent rearward to form a gap 23 between the gate door handle 22 and the rear surface of the gate door 5. In this embodiment, the gate door handle 22 is formed as a rod, and the central portion 22a is formed to extend rearward from the rear surface of the gate door 5, so that it has a substantially horizontal lower surface 24 that an operator can securely place his / her hand on while supporting the weight of the gate door 5 whose linkage with the automatic opening / closing mechanism 8 has been released. Furthermore, by forming the gate door handle 22 into a round bar body, even if the gate door 5 is manually released and falls while changing its angle, the peripheral surface of the gate door handle 22 can form a substantially horizontal lower surface 24 in accordance with the angle of the gate door 5.

[0027] Furthermore, since the gate door handle 22 is formed as a long rod along the side of the gate door 5, even if the worker's attention is directed downward to release the automatic opening / closing mechanism 8 that is usually provided below the gate door, the worker can reliably grab the gate door handle 22 by extending one hand upward along the gate door 5 without directly seeing the gate door handle 22. As another form of the gate door handle 22, as shown in Fig. 6, the gate door handle 22 may be provided with a length that spans both the left and right ends of the gate door 5. If the gate door handle 22 is formed with a length that spans both the left and right ends of the gate door 5 in this way, the worker will not miss the gate door handle 22 if he or she extends his or her hand upward while touching the gate door 5.

[0028] Furthermore, a gap 23 is formed between the gate door handle 22 and the rear surface of the gate door 5, so that the worker can insert his / her fingers into the gap 23 and receive the weight of the gate door 5 securely with the palm of his / her hand, thereby preventing the gate door 5 from accidentally coming off from the worker's hand.

[0029] The central portion 22a can be fixed to the gate door handle 22 by supports 22c provided at predetermined intervals, while forming a gap 23 between the gate door 5 and the central portion 22a. In addition, by providing the supports 22c, deformation of the central portion 22a can be prevented.

[0030] 4 and 5, the gate door handle 22 has a tip 25 that protrudes outward from the side end of the gate door 5, and is configured so that the tip 25 can come into contact with the rear end surface 27 of the side wall 26 of the packing box 4 when the gate door 5 is in the closed position. The tip 25 can be engaged with the rear end surface 27 of the side wall 26 of the packing box 4 when the open gate door 5 is closed, thereby preventing the gate door 5 from falling inward into the packing box 4.

[0031] In this embodiment, the tip 25 is formed integrally by extending the ends of both the left and right ends 22b. This allows the tip 25 to be fixed at the same time as the gate door handle 22 is welded to the gate door 5. By forming the tip 25 integrally with both the left and right ends 22b of the gate door handle 22, the number of steps for attaching the gate door handle 22 and the tip 25 to the gate door 5 can be reduced, and the cost of manufacturing the dump truck 1 equipped with the gate door handle 22 and the tip 25 can be reduced.

[0032] In this embodiment, as shown in the enlarged view of the portion surrounded by the two-dot chain line in Fig. 1, the tip 25 forms a small gap 28 with the rear end surface 27 of the side wall 26 of the packing box 4 when the gate door 5 is in the closed position. When the gap 28 is formed, the gate door handle 22 can be grasped and the gate door 5 can be lifted slightly just before manually opening the gate door 5, and the load on the release device of the automatic opening / closing mechanism 8 can be easily reduced. [Explanation of symbols]

[0033] 1. Dump truck 4 packing boxes 5 Sakido 8 Automatic opening and closing mechanism 10 Arm 11-pin 12 Support member 13 long hole 14 Contact plate 15 base 16 Support pin 17 Support rod 18 Grip part 19 Lock lever 20 Notch 21 Handle 22 Door handle 23 gap 24 Bottom side 25 Tip 28 Gap

Claims

1. A gate door is provided at an opening of a cargo box which is tiltably mounted on a vehicle body frame of a dump truck and has an opening at a rear end thereof so as to be able to open upward, an automatic opening / closing mechanism that connects the packing box and the gate door while supporting the weight of the gate door and opens and closes the gate door in conjunction with the tilting movement of the packing box; a release device that releases the support of the weight of the gate door in the automatic opening / closing mechanism to release the interlocking function with the packing box, thereby enabling the gate door to be manually opened; The gate door is inclined backward and in a closed state, and has a substantially horizontal lower surface, The gate door is provided with a protruding end protruding outward from a side end thereof, and the protruding end is capable of abutting against a rear end surface of a side wall of the packing box when the gate door is in a closed position. A handle for a gate door of a dump truck.

2. The door is provided so as to extend rearward from the rear surface of the gate.

2. The handle for a gate door of a dump truck according to claim 1.

3. A long rod that runs along the side of the gate 3. The handle for a gate door of a dump truck according to claim 2.

4. A gap is provided between the rear surface of the gate 4. The handle for a gate door of a dump truck according to claim 2 or 3.

5. The length of the gate is provided to extend to both the left and right ends of the gate. The handle for a gate door of a dump truck according to any one of claims 1 to 4.

6. The tip forms a small gap between the tip and the rear end surface of the side wall of the packing box when the gate is in the closed position.

2. The handle for a gate door of a dump truck according to claim 1.

7. The automatic opening and closing mechanism includes: An arm portion having a tip portion rotatably supported on the bottom of the packing box and having a joint that can be bent or extended at a middle portion; A support member fixed to the rear surface of the gate and rotatably connected to the tip end of the arm; A long hole formed along the rear surface of the gate in the support member; a pin provided at the other end of the arm portion and inserted into the long hole so as to be rotatable around the axis; The base end is attached to the support member so as to be rotatable in the vertical direction, and the protruding portion of the pin from the long hole is fitted into a notch formed in the tip end. and a fixed arm that supports the weight of the gate. The release device is a handle provided on the fixed arm and capable of rotating the fixed arm in a direction to release the notch from the pin; The handle for a gate door of a dump truck according to any one of claims 1 to 6.

8. The handle for a gate door according to any one of claims 1 to 7 is provided. A dump truck characterized by:

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