JP2024093609A - dump truck - Google Patents

Abstract

To improve protection and design freedom of a lock mechanism of a fan door.SOLUTION: A dump truck includes: an outer frame body that has a cargo box which is so mounted on a vehicle frame as to be tiltable and a bottom-opening type fan door which constitutes a side wall of the cargo box, and in which the fan door is rotatably attached to the cargo box so that a lower side rotates with an upper side as a fulcrum; ang a gate body which is so provided as to close an opening of the outer frame body, and is rotatably attached to the outer frame body so as to rotate in a horizontal direction when the cargo box falls over. The dump truck comprises: an outer frame body bracket provided on the outer frame body; a cargo box bracket provided on the cargo box; a fixing pin for fixing the outer frame body bracket and the cargo box bracket; a first lock member which is a fixed structure provided on the outer frame body; a second lock member which is a fixed structure provided on the cargo box; and a movable handle which is provided on the gate body, and can selectively engage with/disengage from the first lock member and the second lock member.SELECTED DRAWING: Figure 3

Description

The present invention relates to a dump truck that has a tiltable cargo box mounted on the vehicle frame.

In a dump truck with a tiltable cargo box mounted on the vehicle frame, if the cargo box has a downward-opening gate, the lower part of the gate opens naturally as the cargo box tilts, making it very convenient for dumping cargo. However, a downward-opening gate has a fulcrum on its upper side and remains above the floor of the cargo box even when open. Therefore, for example, when loading or unloading cargo from the cargo box, any items that do not fit between the floor of the cargo box and the gate must be lifted higher than the gate to be loaded or unloaded. Also, some items cannot be dumped, such as items that are too large to fit between the gate and the floor of the cargo box when open, or long items.

As described in Patent Document 1, a downward-opening shipping box has a gate door provided at the rear that is composed of a downward-opening outer frame body and a side-opening gate body that closes the opening of the outer frame body. The gate door in this document has a lever handle provided on the outer frame body that can be selectively engaged with the gate body and the shipping box. When this lever handle is engaged with the gate body, the gate body is fixed to the outer frame body and the gate door opens downward. Conversely, when the lever handle is engaged with the shipping box, the outer frame body is fixed to the shipping box, while the gate body is released and the gate door opens sideways.

Japanese Patent No. 5020959

The gate door disclosed in Patent Document 1 is equipped with a lever handle on the outer frame of the gate door. When the gate door is opened sideways and the gate body is opened, this lever handle remains at the rear exit of the cargo box. When the cargo box is dumped in this state, the cargo released from the cargo box may interfere with the lever handle. When discharging large cargo such as rocks, the gate door is often used in sideways opening mode, and if the cargo interferes in this way, the lever handle may be damaged.

In addition, because the lever handle is used to lock both the gate body in the downward-opening mode and the outer frame body in the side-opening mode, the positional relationship between the locking member for locking the gate body, which engages the lever handle, and the locking member for locking the outer frame body is restricted.

The object of the present invention is to provide a dump truck that improves the convenience of loading and unloading operations while maintaining the high level of convenience of the downward-opening gate structure, and that can increase the protection and design freedom of the gate locking mechanism.

In order to achieve the above object, the present invention provides a dump truck having a driver's seat, a vehicle frame connected to the rear of the driver's seat, a cargo box tiltably mounted on the vehicle frame, and a downward-opening gate door forming the side wall of the cargo box, the gate door being attached to an outer frame body rotatably attached to the cargo box so that the lower side of the gate door rotates around the upper side as a fulcrum, and a gate body rotatably attached to the outer frame body so as to close the opening of the outer frame body and rotate horizontally when the cargo box is collapsed, the dump truck being equipped with an outer frame body bracket attached to the outer frame body, a cargo box bracket attached to the cargo box, a fixing pin that fixes the outer frame body bracket and the cargo box bracket, a first locking member that is a fixed structure attached to the outer frame body, a second locking member that is a fixed structure attached to the cargo box, and a movable handle that is attached to the gate body and can be selectively engaged and disengaged with the first locking member and the second locking member.

The present invention improves the convenience of loading and unloading operations while maintaining the high level of convenience of the downward-opening gate structure for dump truck unloading, and also increases the protection and design freedom of the gate locking mechanism.

FIG. 1 is a side view of a dump truck according to an embodiment of the present invention; FIG. 2 is a side view of the loading box of the dump truck of FIG. A rear view of a gate provided on a dump truck according to an embodiment of the present invention. IV-IV line cross-sectional view in FIG. FIG. 4 is a right side view of the gate door of FIG. FIG. 4 is a left side view of the gate door of FIG. FIG. 1 is a rear view of an outer frame locking mechanism provided in a dump truck according to an embodiment of the present invention. FIG. 1 is a right side view of an outer frame locking mechanism provided in a dump truck according to an embodiment of the present invention. FIG. 1 is a diagram showing a state in which a gate body of a gate door provided on a dump truck according to an embodiment of the present invention is opened.

The following describes an embodiment of the present invention using the drawings.

Figure 1 is a side view of a dump truck according to one embodiment of the present invention, and Figure 2 is a side view of a cargo box of the dump truck in Figure 1. In the following description, the left and right in Figure 1 are the front and rear of the dump truck.

-dump truck-
The dump truck shown in Fig. 1 comprises a vehicle 3 having a driver's seat 1 and a chassis 2 connected to the rear of the vehicle, and a cargo box 10 mounted on the upper part of the chassis 2 so as to be able to tilt freely. The frame of the chassis 2 is formed by connecting left and right frames extending in the front-rear direction with cross members. The cargo box 10 is mounted on the upper part of the chassis 2 via a subframe 4. The cargo box 10 tilts relative to the chassis 2 around a hinge 5 provided at the rear end of the subframe 4.

The left and right cargo box frames 11 extending forward and backward are provided on the underside of the cargo box 10. The cargo box frames 11 and the subframe 4 of the vehicle frame 2 are connected by a hydraulic cylinder (not shown) that expands and contracts with hydraulic oil from a hydraulic pump (not shown) mounted on the vehicle 3. One end of this hydraulic cylinder is rotatably supported by the cargo box frame 11 via a hoist mechanism (not shown), and the other end is rotatably supported by the subframe 4 of the vehicle frame 2. When the hydraulic cylinder is extended to extend the hoist mechanism, the cargo box 10 rotates with respect to the vehicle frame 2 at the hinge 5 as a fulcrum and rises to an upright position (two-dot chain line in FIG. 1). When the hydraulic cylinder is then contracted to bend the hoist mechanism, the cargo box 10 rotates with respect to the vehicle frame 2 at the hinge 5 as a fulcrum and returns to a lying position (solid line in FIG. 1).

The cargo box 10 consists of a floor and front, rear, left and right side walls. In this embodiment, of the four side walls, the rear wall forms the tailgate 12, and the other three side walls form fixed walls. However, there are cases where the left and right side walls form the tailgate instead of the rear wall, and cases where the left and right side walls and the rear wall form the tailgate, as in the case of a three-way dump truck. In this embodiment, a dump truck with a tailgate on the rear wall is used as an example, but the present invention can also be applied to dump trucks with other side walls as tailgates, as described above.

- Windscreen door -
Fig. 3 is a rear view of the gate door 12, Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3, Fig. 5 is a right side view of the gate door 12, Fig. 6 is a left side view thereof, Fig. 7 is a rear view of the outer frame body locking mechanism (described later), and Fig. 8 is a right side view thereof.

As shown in these figures, the gate 12 comprises an outer frame 15 and a gate body 16. The outer frame 15 is configured in a horizontal U-shape with a horizontal frame 15a that forms its bottom edge and vertical frames 15b, 15c that form the left and right sides, and there is no element that forms the top edge, leaving the top open. The gate body 16 is provided so as to cover the opening of the outer frame 15 (the space between the vertical frames 15b, 15c).

The outer frame 15 is rotatably attached to another part of the packing box 10 (in this example, the upper rear ends of the left and right side walls 19, 20) via two hinges 17, 18 attached to the upper ends of the left and right vertical frames 15b, 15c, and rotates around the upper side (the pins of the hinges 17, 18) as a fulcrum, opening the lower side relative to the packing box 10 as the packing box tilts (Figure 1).

The gate body 16 is rotatably attached to the left vertical frame 15b (or the right vertical frame 15c) of the outer frame 15 via hinges 25, 26 so that it can rotate horizontally when the packing box 10 is collapsed. Each hinge 25, 26 consists of upper and lower bosses 27 and two plates 28, one connected to each boss.

One plate 28 of each hinge 25, 26 is fixed to the left side surface of the outer frame body 15 (left side surface of the vertical frame 15b) with the boss 27 protruding rearward from the rear surface of the outer frame body 15, for example, when viewed from the left side of the outer frame body 15 (Figure 6). The other plate 28 of each hinge 25, 26 is fixed to the rear surface of the gate body 16 with the boss 27 protruding leftward from the left end surface of the outer frame body 15 (left side surface of the vertical frame 15b), for example, when viewed from the rear side of the outer frame body 15 (Figure 3). In this way, two plates 28 constituting the hinges 25, 26 are provided at equal intervals above and below on the left side surface of the vertical frame 15b of the outer frame body 15 and the left end of the rear surface of the gate body 16. Then, with the boss 27 of one plate 28 fixed to the gate body 16 placed on top of the boss 27 of the other plate 28 fixed to the outer frame body 15, a single shaft 29 is inserted through these four bosses 27, connecting the four plates 28 via the shaft 29.

In addition, in Figures 3 and 6, there is a gap between the upper and lower hinges 25, 26 and the center of the shaft 29 is exposed, but the hinges 25, 26 may be configured so that there is no gap between the top and bottom and the shaft 29 is not exposed. Also, in this embodiment, an example is described in which two hinges 25, 26 (a total of four plates 28) are provided, but the number of hinges can be changed.

-Automatic release lock mechanism-
The box 10 is also provided with an automatic release type locking mechanism 30 that locks the gate door 12 from opening downward when the box 10 is collapsed, and automatically unlocks the gate door 12 when the box is tilted, allowing the gate door 12 to open downward. When the box 10 is collapsed, the automatic release type locking mechanism 30 restrains the outer frame body 15 with a hook 32 hooked on a bracket 31 provided on the lower part of the horizontal frame 15a of the outer frame body 15, and when the box 10 is tilted, the hook 32 is released from the bracket 31 by a mechanism that operates in conjunction with the tilting of the box 10, allowing the outer frame body 15 to open downward. When the box returns from the tilted state to the collapsed state, the hook 32 is automatically hooked on the bracket 31, and the outer frame body 15 is returned to the restrained state relative to the box 10. A more specific configuration of the automatic release type lock mechanism 30 is described in, for example, Japanese Patent Publication Nos. 58-49410, 59-25694, and 60-21095.

- Outer frame locking mechanism -
In addition to the automatic release type lock mechanism 30, the dump truck is equipped with a manually operated outer frame body lock mechanism 40 that prevents the outer frame body 15 from opening downward when the cargo box 10 is erected with the gate body 16 open (with the gate 12 opened to the side). The outer frame body lock mechanism 40 includes an outer frame body bracket 41 provided on the outer frame body 15, a cargo box bracket 42 provided on the cargo box 10, and a fixing pin 43 that fixes the outer frame body bracket 41 and the cargo box bracket 42.

In this embodiment, the outer frame bracket 41 protrudes downward from the underside of the horizontal frame 15a. A pair of cargo box brackets 42 are provided on the cargo box 10 so that their positions correspond to those of the outer frame bracket 41. By inserting one fixing pin 43 in the left-right direction into pin holes provided on the outer frame bracket 41 and the cargo box bracket 42, the outer frame bracket 41 and the cargo box bracket 42 are locked to each other via the fixing pin 43, and the outer frame 15 is restrained to the cargo box 10.

In addition, in this embodiment, a configuration is illustrated in which a pair of outer frame brackets 41 are provided on the side farther from the hinges 25, 26 (position toward the right) than the center of the outer frame 15 in the left-right direction of the outer frame 15. The positions (left-right positions) of the outer frame bracket 41, the packing box bracket 42, and the first locking member 52 described below correspond to each other. However, the outer frame bracket 41 can be installed at any position on the outer frame 15, and multiple pairs can also be provided. When multiple pairs of outer frame brackets 41 are provided, multiple sets of packing box brackets 42 and fixing pins 43 are also prepared accordingly as necessary.

The fixing pin 43 is connected to the outer frame 15 via a chain 44 to prevent the fixing pin 43 from being lost after it is removed from the outer frame bracket 41 and the packing box bracket 42. The fixing pin 43 removed from the outer frame bracket 41 and the packing box bracket 42 can be attached to a holding member provided on the outer frame 15. In this embodiment, a pin holding hole 45 (FIG. 5) is provided in the outer frame bracket 41 at a position that does not overlap with the packing box bracket 42 when viewed from the left and right, and the fixing pin 43 can be held by inserting it into the pin holding hole 45. In other words, in this embodiment, the outer frame bracket 41 also serves as a holding member for the fixing pin 43.

In this way, the fixing pin 43 is connected to the outer frame body 15 via the chain 44, and can be removed from the cargo box bracket 42 and inserted into the pin holding hole 45 to attach to the outer frame body 15. When the gate door 12 opens downward, the fixing pin 43 moves with the gate door 12 and moves out of the way of the cargo discharge path.

The fixing pin 43 is configured so that its tip 43a can be bent relative to the main body of the fixing pin 43 via a pin (not shown), which constitutes a fall-off prevention mechanism. As shown in FIG. 7, by inserting the fixing pin 43 into the outer frame bracket 41 and the packing box bracket 42 and bending the tip 43a, the fixing pin 43 is prevented from falling off from the outer frame bracket 41 and the packing box bracket 42. Needless to say, this fall-off prevention mechanism also functions when the fixing pin 43 is inserted into the pin holding hole 45.

- Gate body lock mechanism -
The gate body 16 is fixed to the outer frame body 15 by a gate body locking mechanism 50. The gate body locking mechanism 50 includes first locking members 51, 52 which are fixed structures provided on the outer frame body 15, a second locking member 53 (FIGS. 1 and 2) which is a fixed structure provided on the shipping box 10, and a movable handle 55 which can be selectively engaged with and disengaged from the first locking members 51, 52 and the second locking member 53.

In this embodiment, the first locking member 51 is provided on the rear surface (surface facing backward) of the vertical frame 15c on the right side of the outer frame body 15. The first locking member 52 is provided on the rear surface (same) of the horizontal frame 15a of the outer frame body 15. The second locking member 53 is provided on the outer wall surface of the side wall 19 on the left side of the packing box 10 (the side on which the hinges 25, 26 of the packing box 10 are provided). The distance from the shaft 29 of the hinges 25, 26 to the second locking member 53 corresponds to the distance from the shaft 29 to the first locking member 51. The first locking member 51 and the second locking member 53 also correspond in height position. The first locking members 51, 52 and the second locking member 53 are block-shaped or bracket-shaped members, and each has a pin hole (not shown) that opens upward. These pin holes may or may not penetrate the first locking members 51, 52 and the second locking member 53.

The movable handle 55 is held by support members 54 arranged vertically at a predetermined interval on the rear surface of the gate body 16, and is configured to be slidable vertically and rotatable horizontally relative to the gate body 16. In this embodiment, the support members 54 are provided on the side farther from the hinges 25, 26 than the center of the outer frame body 15 in the left-right direction of the outer frame body 15. The outer frame body bracket 41, the shipping box bracket 42, the first locking member 52, and the support members 54 are arranged vertically, and the left-right positions of the outer frame body bracket 41, the shipping box bracket 42, the first locking member 52, and the support members 54 correspond to each other.

The movable handle 55 is formed in a J-shape by a first locking portion 55a, a second locking portion 55b, and a handle portion 55c. The first locking portion 55a can be selectively inserted into a pin hole of the first locking member 51 or the second locking member 53 to be locked to either the first locking member 51 or the second locking member 53. The second locking portion 55b can be inserted into a pin hole of the first locking member 52 to be locked to the first locking member 52. The handle portion 55c connects the first locking portion 55a and the second locking portion 55b. The handle portion 55c extends horizontally, and the first locking portion 55a and the second locking portion 55b extend downward from the handle portion 55c. The second locking portion 55b is longer vertically than the first locking portion 55a. The second locking portion 55b is supported by the support member 54, and the movable handle 55 can slide in the axial direction (up and down) and rotate horizontally around the second locking portion 55b.

The second locking portion 55b of the movable handle 55 inserted into the support member 54 is provided with a stopper portion 55d located between the upper and lower support members 54. The second locking portion 55b is provided with a spring 57 interposed between the stopper portion 55d and the upper support member 54, and the spring 57 biases the movable handle 55 toward the first locking members 51, 52 and the second locking member 53, i.e., downward.

When the movable handle 55 is lifted up against the spring 57, the first and second locking parts 55a and 55b are released from the first locking members 51 and 52, and the gate body 16 is released from the outer frame body 15. The movable handle 55 also serves as a handle for the gate body 16, and can be used as a handle when removed from the first locking members 51 and 52. When the gate body 16 is released from the constraint, the movable handle 55 removed from the first locking members 51 and 52 can be pulled backward to open the gate body 16 around the shaft 29 and open the gate 12 to the side. In addition, the opened gate body 16 can be rotated forward 270 degrees and the first locking part 55a of the movable handle 55 can be inserted into the second locking member 53 to fix the gate body 16 in the open state.

The amount by which the movable handle 55 (second locking portion 55b) protrudes downward from the lower support member 54 is ensured to be longer than the maximum stroke of the movable handle 55, which is determined by the vertical spacing of the support member 54, the thickness of the stopper portion 55d, and the thickness of the spring 57 when contracted, so that the second locking portion 55b will not come off the support member 54 even if the movable handle 55 is lifted upward.

-Operation of the sliding door-
3 (locked position), if the movable handle 55 is lifted against the biasing force of the spring 57, the first and second locking portions 55a and 55b of the movable handle 55 are first pulled out of the first locking members 51 and 52, and the gate body 16 is unlocked. If the movable handle 55 is then pulled backward to open the gate body 16, the rear of the cargo box 10 is left wide open with no obstacles, making loading and unloading of cargo into the cargo box 10 efficient.

The opened gate body 16 can be fixed by rotating it forward and engaging the movable handle 55 with the second locking member 53. Then, as shown in FIG. 9, the movable handle 55 moves to the left side of the packing box 10 together with the gate body 16, so that the movable parts of the locking mechanism are retracted from the rear opening of the opened packing box 10. When the packing box 10 is tilted in this state, the automatic release type locking mechanism 30 is unlocked as the packing box 10 tilts, but since the outer frame body 15 is fixed to the packing box 10 by the outer frame body locking mechanism 40, the cargo in the packing box 10 can be dumped from the space of the opened gate body 16 (the space between the vertical frames 15b and 15c of the outer frame body 15). In this case, since the gate body 16 has retracted from the rear of the packing box 10, there is no obstacle, and even cargo larger than the height of the gate body 16 or long objects can be easily dumped. In addition, the movable handle 55, which is a movable part, is retracted from the discharge path of the cargo box 10, so interference between the cargo being dumped and the movable handle 55 is also reduced.

On the other hand, if the cargo box 10 is returned to the down position by reversing the above steps and the movable handle 55 is returned to the locked position, the gate body 16 is firmly fixed to the outer frame body 15 at two points by the movable handle 55. Normally, it is left in this state, and when performing the downward opening operation of the gate door, the fixing pin 43 is removed from the cargo box bracket 42 to release the constraint of the outer frame body 15 by the outer frame body locking mechanism 40, and is then inserted into the pin holding hole 45. This places the outer frame body 15 in a state where it is locked only by the automatic release type locking device 30.

If the cargo box 10 is tilted with the outer frame 15 released from the outer frame locking mechanism 40, the cargo in the cargo box 10 can be dumped in the same way as a conventional cargo box with a downward-opening gate door. Once this dumping operation is complete, the cargo box 10 is tilted down and the fixing pin 43 is inserted again into the outer frame bracket 41 and the cargo box bracket 42.

-effect-
(1) According to this embodiment, since the outer frame locking mechanism 40 and the gate locking mechanism 50 are provided, the gate door 12 can be used in a downward opening state for dumping by unlocking the outer frame locking mechanism 40, and the gate door 12 can be used in a side opening state for dumping by unlocking the gate locking mechanism 50. In addition, by unlocking the gate locking mechanism 50 and opening the gate body 16, the rear of the cargo box 10 can be opened widely and free of obstacles. This allows efficient loading and unloading of cargo into the cargo box 10.

At this time, according to this embodiment, when the gate door 12 is used in a side-opening mode, the movable handle 55 moves to the side of the cargo box 10 together with the gate body 16, and the movable handle 55, which is a movable part of the gate body locking mechanism 50, is retracted from the discharge path of the cargo box 10. Therefore, it is possible to prevent the cargo discharged from the cargo box 10 from interfering with the movable handle 55. In addition, since the outer frame body locking mechanism 40 and the gate body locking mechanism 50 are independent of each other, the layout constraints of the outer frame body locking mechanism 40 imposed by the gate body locking mechanism 50 can also be alleviated.

As described above, according to this embodiment, it is possible to improve the convenience of loading and unloading operations while maintaining the high level of convenience of the dump unloading operation due to the downward opening structure of the gate door 12, and to increase the protection and design freedom of the locking mechanism of the gate door 12.

(2) Not only is the first engaging portion 55a of the movable handle 55 fixed to the first locking member 51, but the second engaging portion 55b, which serves as the rotation axis of the movable handle 55, is fixed to the first locking member 52. Despite its simple configuration, it has the advantage that the gate body 16 can be firmly fixed with two locks, and that the two locks can be operated simultaneously.

In this embodiment, the movable handle 55 is configured to use not only the first locking portion 55a but also the second locking portion 55b to restrain the gate body 16. However, in order to ensure operability, it is not necessarily necessary to be limited to this configuration. Even without such a double lock structure, if the strength of the first locking portion 55a is sufficient, for example, it is possible to omit the locking mechanism between the second locking portion 55b and the first locking member 52 and simply lock the first locking portion 55a to the first locking member 51 to fix the gate body 16.

(3) Because there is a high degree of freedom in the layout of the outer frame body locking mechanism 40, it is possible to place the outer frame body locking mechanism 40 at a position away from the gate body locking mechanism 50 depending on the specifications of the packing box 10. On the other hand, it is also possible to place the outer frame body locking mechanism 40 depending on the position of the gate body locking mechanism 50. As shown in FIG. 3, by matching the left-right positions of the outer frame body bracket 41, the packing box bracket 42, and the first locking member 52, the worker can operate the movable handle 55 and the fixed pin 43 from the same standing position, ensuring high operability.

(4) The fixing pin 43 has a bendable anti-slip mechanism at the tip 43a, so not only can the fixing pin 43 be prevented from falling out, but no additional parts are required to prevent the fixing pin 43 from falling out. Therefore, it is possible to prevent the number of parts from increasing due to the provision of a mechanism to prevent the fixing pin 43 from falling out.

The mechanism for preventing the fixing pin 43 from falling out can be applied not only to preventing the fixing pin 43 from falling out of the outer frame bracket 41 and the cargo box bracket 42, but also to preventing the fixing pin 43 from falling out of the pin holding hole 45. Therefore, when the downward opening structure of the gate 12 is used for dumping, the fixing pin 43 is prevented from falling out of the pin holding hole 45, and the fixing pin 43 is prevented from interfering with the cargo being discharged from the cargo box 10.

(5) The fixing pin 43 can be connected to the outer frame body 15 via the chain 44 and held in the pin holding hole 45. This makes it possible to prevent the fixing pin 43 from being lost after it has been removed from the outer frame body bracket 41 and the cargo box bracket 42. In addition, by holding the fixing pin 43 removed from the outer frame body bracket 41 and the cargo box bracket 42 in the pin holding hole 45, the fixing pin 43 moves along with the gate door 12 when the gate door 12 opens downward. This makes it possible to prevent the fixing pin 43 from interfering with cargo being discharged from the cargo box 10.

(6) Because the movable handle 55 also serves as the handle for the gate body 16, there is no need to provide a separate handle for opening the gate body 16. This also helps to reduce the number of parts.

--Modifications--
In the above, an example was given of the case where the rear wall of the cargo box 10 is a gate door, but the present invention can also be applied to dump trucks and so-called three-way dump trucks in which the side walls 19, 20 are gate doors. When the side walls 19 and 20 are gate doors, it is preferable that the side-opening gate body be within half the total length of the side wall (the length in the front-rear direction of the vehicle body) or the width of the rear wall (the length in the left-right direction of the vehicle body) in order to provide the cargo box with a holding member that holds the gate in the fully open state.

1...Driver's seat, 2...Vehicle frame, 10...Cargo box, 12...Side gate, 15...Outer frame body, 16...Gate body, 41...Outer frame body bracket, 42...Cargo box bracket, 43...Fixed pin, 43a...Tip (anti-slip mechanism), 44...Chain, 45...Pin retaining hole (retaining member for fixed pin), 51, 52...First locking member, 53...Second locking member, 55...Movable handle

Claims (5)

A dump truck has a driver's seat, a vehicle frame connected to the rear of the driver's seat, a cargo box tiltably mounted on the vehicle frame, and a downward-opening gate door forming a side wall of the cargo box, the gate door being attached to an outer frame body rotatably attached to the cargo box so that the lower side of the gate door rotates around the upper side as a fulcrum, and a gate body rotatably attached to the outer frame body so as to close an opening of the outer frame body and rotate horizontally when the cargo box is collapsed,
An outer frame bracket provided on the outer frame;
A packing box bracket provided on the packing box;
A fixing pin for fixing the outer frame bracket and the packing box bracket;
A first locking member which is a fixed structure provided on the outer frame body;
A second locking member which is a fixed structure provided on the packing box;
a movable handle provided on the gate body and capable of selectively engaging and disengaging with the first locking member and the second locking member. In the dump truck of claim 1,
A dump truck, characterized in that the outer frame bracket, the cargo box bracket, and the first locking member are positioned in correspondence with each other. In the dump truck of claim 1,
The dump truck is characterized in that the fixing pin has a bendable anti-fall-out mechanism at its tip. In the dump truck of claim 1,
A dump truck characterized in that the outer frame body is connected to the fixing pin via a chain and is provided with a retaining member for the fixing pin. In the dump truck of claim 1,
A dump truck, wherein the movable handle also serves as a handle for the gate body.

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