Dump automobile

Abstract

To provide a lower side opening lock mechanism which is less affected by sand and makes a pin less likely to be lost in a dump automobile having a tail gate which can be opened from the lower side to the upper side and opened from the upper side to the lower side.SOLUTION: A lower side opening lock mechanism 30 includes: a cylindrical holder 31 provided at a tail panel 8 and having a groove hole 32; a pin 33 provided in the holder 31; a pin hole forming member 34 provided at a lower part of the tail gate 9 and provided with a pin hole 34a; and a holding part 35 protruding from the pin 33 to the outer side of the holder 31 through the groove hole 32. The holding part 35 is slid along the groove hole 32 and the pin 33 is inserted into or removed from the pin hole 34a to lock the lower side opening of the tail gate 9 or unlock the lock.SELECTED DRAWING: Figure 5A

Description

[Technical field]

[0001] The present invention relates to a dump vehicle equipped with a tailgate that can be opened both upward and downward, and more particularly to a dump vehicle equipped with a mechanism for locking the downward opening of the tailgate. [Background technology]

[0002] As described in Patent Document 1, a dump truck is known that has a tailgate at the rear of the loading platform that can be opened upward or downward. Here, "opening downward" means that the tailgate rotates from the bottom to the top around the top of the tailgate. "Opening upward" means that the tailgate rotates from the top to the bottom around the bottom of the tailgate.

[0003] Such a tailgate that can be opened both upward and downward is provided with a downward-opening lock mechanism having a pin that locks the downward opening and rotatably supports the tailgate when opened upward. Patent Document 1 shows a downward-opening lock mechanism that includes a first bracket fixed to the lower end of the tailgate and a second bracket fixed to a tail panel that constitutes the rear lower end of the cargo bed. Each of the first bracket and the second bracket has pin holes that open to the left and right. In this downward-opening lock mechanism, the tailgate is locked by overlapping the first bracket and the second bracket to the left and right and inserting a pin into the pin hole formed in each bracket. When unlocking, the pin is pulled out from the pin hole. To prevent the pulled-out pin from being lost, the pin is attached to the tail panel by a chain.

[0004] When discharging soil from the bed, it is necessary to release the lock so that the bed can be opened downward. When releasing the lock, the pin is pulled out of the pin hole. If the pin is left hanging from the chain at this time, it may swing and collide with vehicle parts such as reflectors, damaging the vehicle parts. To prevent this, a holder for storing the pin is provided on the bottom of the bed, etc. When the lock is released, the pin is stored in the holder to prevent it from swinging. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-36113 A Summary of the Invention [Problem to be solved by the invention]

[0006] As shown in FIG. 12, when discharging soil 160 from the loading platform 104, the pin (not shown) is pulled out of the pin hole and stored in the holder 106. This allows the tailgate 105 to be opened downward. The chain 150 connected to the pin is in a hanging state. When the loading platform 104 is tilted, soil 160 is discharged from the loading platform 104. At this time, the discharged soil 160 may come into contact with the chain 150. Furthermore, the discharged soil 160 piles up behind the loading platform 104. Since the hanging chain 150 swings toward the rear of the vehicle as the loading platform 104 tilts, the chain 150 may become buried in the piled up soil 160. If the chain 150 comes into contact with or is buried in the soil 160, the chain 150 is likely to be damaged. This may result in deterioration of the chain 150 over time or major damage, which may cause the chain 150 to break and the pin to be lost.

[0007] The present invention has been made in consideration of the above-mentioned points, and its object is to provide a dump truck having a tailgate downward-opening lock mechanism that is less susceptible to the effects of soil and sand and does not lose its pin. [Means for solving the problem]

[0008] The dump truck according to the present invention comprises a chassis, a loading platform disposed on the upper part of the chassis and having a tail panel, a tailgate provided at the rear of the loading platform with at least a portion thereof located above the tail panel, an upper hinge provided at the upper part of the tailgate and rotatably connecting the tailgate to the loading platform, and a downward-opening lock mechanism provided at the lower part of the tailgate and the tail panel. The downward-opening lock mechanism comprises a tubular retainer fixed to the tail panel and extending left and right with a slot formed therein, a pin slidably provided inside the retainer, a gripping portion extending radially outward from the pin and protruding outward from the retainer through the slot, and a pin hole forming member connected to the lower part of the tailgate, disposed to the side of the retainer and formed with a pin hole opening toward the retainer. The tailgate is configured so that when the pin is held by the retainer and disengaged from the pin hole, it can be opened downward from below by the upper hinge, and when the pin is held by the retainer and inserted into the pin hole, it can be opened upward from above by using the pin as a pivot axis.

[0009] According to the dump vehicle, the pin can be slid toward the pin hole while being held by the holder by sliding the grip portion along the slot. The tailgate can be locked from being opened downward by inserting a part of the pin into the pin hole. At this time, the pin is inserted into the holder fixed to the tail panel and the pin hole forming member connected to the tailgate. Therefore, when the tailgate is opened upward, the pin functions as a pivot shaft that rotatably supports the tailgate. When discharging the soil loaded on the loading platform, the pin can be pulled out of the pin hole by sliding the grip portion in the opposite direction along the slot. This releases the lock from being opened downward. Even after the lock is released, the pin is held by the holder. Therefore, according to the dump vehicle, a chain for preventing the pin from being lost is not necessary. When discharging soil, the chain does not swing toward the rear of the vehicle and does not come into contact with the soil. Therefore, the pin is not lost due to the chain breaking. Furthermore, when discharging soil, the pin is stored in the holder. The retainer can reduce the impact of falling soil and sand, and because the retainer is positioned higher than the hanging chain, the downward-opening locking mechanism is less affected by soil and sand, and the pin is less likely to be lost.

[0010] The dump vehicle may include a canopy disposed below the tailgate and above at least a portion of the retainer.

[0011] This prevents soil discharged from the loading platform from accumulating on the holder. If soil accumulates on the holder, there is a concern that it may become difficult to smoothly slide the gripping portion along the groove. In other words, there is a concern that it may become difficult to smoothly insert the pin into the pin hole and pull the pin out of the pin hole. However, according to the above, soil is unlikely to accumulate on the holder, so that it is possible to smoothly insert the pin into the pin hole and pull the pin out of the pin hole.

[0012] The eaves may be inclined downward as it extends rearward from the tail panel.

[0013] This allows the soil discharged from the loading platform to easily slide down the eaves, preventing soil from accumulating on the eaves.

[0014] The dump vehicle may include a spring disposed inside the holder and biasing the pin toward the pin hole.

[0015] As a result, the pin is subjected to the restoring force of the spring in the direction in which it is inserted into the pin hole, so that when the downward-opening lock is in place, the pin can be prevented from coming out of the pin hole and the downward-opening lock being released.

[0016] The pin is held by the holder so that it can rotate around the axis of the pin, and the groove hole may have a slide hole extending left and right, a locking hole extending up and down from the slide hole and with which the gripping portion engages when the pin is inserted into the pin hole to restrict left and right movement of the pin, a non-locking hole extending up and down from the slide hole and formed at a position farther from the pin hole than the locking hole and with which the gripping portion engages when the pin is out of the pin hole to restrict left and right movement of the pin, and a latching hole extending from the tip of the non-locking hole to the left or right, whichever comes closer to the pin hole.

[0017] This prevents the pin from moving unexpectedly by engaging the grip with the lock hole or the non-lock hole. For example, when releasing the downward opening lock to unload soil from the loading platform, the pin can be prevented from jumping out of the holder unexpectedly.

[0018] The slot may be oriented downwardly at an angle of 30 degrees or more from horizontal, and the gripping portion may be curved.

[0019] This can prevent soil and sand from entering the inside of the holder.

[0020] The dump vehicle may have a tip holding portion that is fixed to the tail panel, that is disposed on the opposite side of the pin hole forming member from the holder side, and that engages with the tip of the pin.

[0021] This can prevent the intermediate pin from coming off the holder. Effect of the Invention

[0022] According to the present invention, it is possible to provide a dump truck having a tailgate downward-opening locking mechanism that is less susceptible to the effects of soil and sand and does not lose its pin. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a side view of a dump truck according to an embodiment. [Diagram 2] FIG. 4 is a rear view of the tailgate, the downward-opening lock mechanism, etc. [Figure 3A] FIG. 13 is a side view of the upper hinge. [Figure 3B] FIG. 13 is a rear view of the upper hinge. [Figure 4] FIG. 4 is a rear view of the tailgate lower metal fitting. [Figure 5A] 13 is a rear view of the downward-opening lock mechanism in a state in which the downward-opening is locked. FIG. [Figure 5B] 13 is a rear view of the downward-opening lock mechanism in an unlocked state. FIG. [Figure 6] FIG. 13 is a side view of the downward-opening lock mechanism. [Figure 7A] FIG. [Figure 7B] FIG. [Figure 8] 1A is a vertical cross-sectional view taken through a slide hole of the holder, and FIG. 1B is a vertical cross-sectional view taken through a locking hole or a non-locking hole of the holder. [Figure 9]FIG. 13 is a side view of the downward-opening lock mechanism when the retainer is attached to the tail panel so that the slot faces downward at an angle of 30° or more from the horizontal. [Figure 10] FIG. 13 is a rear view of the downward-opening lock mechanism having the tip holder. [Figure 11A] This is a rear view of the entire tailgate when two downward-opening lock mechanisms are arranged inside the lower metal fitting of the tailgate. [Figure 11B] This is a rear view of the entire tailgate when two downward-opening lock mechanisms are arranged outside the lower metal fitting of the tailgate. [Figure 12] FIG. 1 is a side view of a conventional dump truck when discharging earth and sand loaded on a loading platform. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0025] As shown in FIG. 1, the dump truck 1 includes a chassis 2, a cab 3 supported by the chassis 2, and a loading platform 4 supported by the chassis 2 and provided behind the cab 3.

[0026] The loading platform 4 has a bottom plate 5, a front plate 6 extending upward from the front end of the bottom plate 5, and side plates 7 extending upward from the left and right ends of the bottom plate 5. The loading platform 4 also has a tail panel 8 at the rear lower end. The tail panel 8 extends downward from the rear end of the bottom plate 5. The rear of the loading platform 4 is provided with a tailgate 9 that can be opened upward and downward. Here, the upward opening means that the tailgate 9 is rotated from the top to the bottom around the lower part of the tailgate 9. The downward opening means that the tailgate 9 is rotated from the bottom to the top around the lower part of the tailgate 9. Although not shown in the figures, the dump car 1 is provided with a dump mechanism that tilts the loading platform 4 backward and downward. As the dump mechanism, various dump mechanisms that have been conventionally known can be used. The configuration of the dump mechanism is well known, so its description will be omitted here. With the tailgate 9 open upward or downward to open the rear of the loading platform 4, the loading platform 4 can be tilted backward and downward to discharge the soil and sand loaded on the loading platform 4.

[0027] As shown in FIG. 2, upper hinges 10 are provided at both ends of the upper part of the tailgate 9. Upper hinge brackets 11 are provided at both ends of the upper part of the tailgate 9. As shown in FIG. 3A and FIG. 3B, the upper hinge 10 has an upper hinge shaft 12 extending in the left-right direction provided on the upper hinge bracket 11, and a fastening metal fitting 13 provided on the upper rear end of each side plate 7 and fastening the upper hinge shaft 12. The upper hinge shaft 12 is the center of rotation when the tailgate 9 is opened downward. The fastening metal fitting 13 has a receiving metal fitting 14, a fastening portion 15, and an operating handle 16. The receiving metal fitting 14 has a U-shaped receiving opening that opens toward the rear. The fastening portion 15 is formed in the same shape as the U-shaped receiving opening, and is supported by the receiving metal fitting 14 so as to be rotatable. The fastening portion 15 is provided at the tip of the operating handle 16. The operating handle 16 is configured so as to be rotatable up and down. When opening the tailgate 9 upward, the upper hinge shaft 12 is released from its fastening by using the operating handle 16. On the other hand, when opening the tailgate 9 downward, the upper hinge shaft 12 is kept in a fastened state.

[0028] As shown in FIG. 2, a tailgate lower metal fitting 20 is provided on the lower part of the tailgate 9 and the tail panel 8. A conventionally known tailgate lower metal fitting 20 can be used. The configuration of the tailgate lower metal fitting 20 may be the same as that of the gate opening / closing device shown in, for example, JP 2008-221950 A. The configuration of the tailgate lower metal fitting 20 is well known, so a detailed description thereof will be omitted here. The tailgate lower metal fitting 20 is configured to automatically open downward in conjunction with the tilting of the loading platform 4. As shown in FIG. 4, the tailgate lower metal fitting 20 includes a lower shaft 22, a guide plate 23, a hook 24, and an operating mechanism (not shown) for operating the hook 24. The lower shaft 22 is connected to a pair of left and right brackets 21 provided on the tailgate 9. The guide plate 23 is provided on the front side of the tail panel 8 to correspond to the lower shaft 22, and extends in the up-down direction and the front-rear direction. The hook 24 is disposed in a rectangular opening 8a formed in the tail panel 8, and protrudes from the back side of the tail panel 8 to the front side. The operating mechanism is configured to operate the hook 24 in accordance with the tilting of the loading platform 4. Here, the front side of the tail panel 8 refers to the rear side of the vehicle, and the back side of the tail panel 8 refers to the front side of the vehicle.

[0029] As shown in FIG. 2, the lower part of the tailgate 9 and the tail panel 8 are provided with a downward-opening lock mechanism 30 for preventing the tailgate 9 from opening downward, in addition to the tailgate lower metal fitting 20. In this embodiment, the downward-opening lock mechanism 30 is provided in the center of the vehicle in the left-right direction. FIG. 5A is a rear view of the downward-opening lock mechanism 30 in a state where the downward-opening is locked. FIG. 5B is a rear view of the downward-opening lock mechanism 30 in a state where the downward-opening is unlocked. As shown in FIG. 5A and FIG. 5B, the downward-opening lock mechanism 30 includes a cylindrical retainer 31 having a groove hole 32, a pin 33 provided inside the retainer 31, and a pin hole forming member 34 provided in the lower part of the tailgate 9 and having a pin hole 34a. In this embodiment, the retainer 31 is a cylinder, but may be a square tube or the like. The pin 33 is provided with a gripping portion 35. The gripping portion 35 extends radially outward from the pin 33. The grip portion 35 protrudes outward from the holder 31 through the slot 32 of the holder 31. When an operator grasps the grip portion 35 and slides the grip portion 35 along the slot 32, the pin 33 can be inserted into the pin hole 34a. By inserting the pin 33 into the pin hole 34a, the tailgate 9 can be locked from opening downward.

[0030] As shown in FIG. 6, the retainer 31 is connected to the tail panel 8 by the eaves 36 and the plate 37. The eaves 36 extends rearward and downward from the tail panel 8. The eaves 36 is inclined from the horizontal line so as to slope downward as it approaches the rear of the vehicle. The eaves 36 is disposed above at least a portion of the retainer 31. Here, the eaves 36 is disposed above the entire retainer 31 in the left-right direction (see FIG. 2). The front edge of the eaves 36 is connected to the tail panel 8, and the rear edge is connected to the upper part of the retainer 31. The plate 37 extends horizontally rearward from the tail panel 8 and is connected to the retainer 31. With this configuration, the eaves 36 prevents soil from accumulating on the upper part of the retainer 31 when soil is discharged.

[0031] As shown in Figures 5A and 5B, a spring 38 and a stopper 39 are provided inside the holder 31. The stopper 39 prevents the spring 38 and the pin 33 from coming off the holder 31. The spring 38 biases the pin 33 toward the pin hole 34a. When the pin 33 is slid against the biasing force of the spring 38, the spring 38 contracts and the pin 33 comes off the pin hole 34a. By attaching the spring 38 in this manner, the pin 33 receives the restoring force of the spring 38 in the direction in which it is inserted into the pin hole 34a. Therefore, the pin 33 can be prevented from coming off the pin hole 34a when the downward-opening lock is activated.

[0032] FIG. 7A is a view of the retainer 31 as viewed from the rear. FIG. 7B is a view of the retainer 31 as viewed from below. As shown in FIG. 7A, the slot 32 has a slide hole 32a, a lock hole 32b, and a non-lock hole 32c, and is formed in a U-shape. The slide hole 32a extends in the left-right direction of the vehicle and faces the rear of the vehicle. The lock hole 32b extends downward from the left side of the slide hole 32a. The non-lock hole 32c extends downward from the right side of the slide hole 32a. The non-lock hole 32c is formed in a position farther from the pin hole 34a than the lock hole 32b. Also, as shown in FIG. 7B, the slot 32 has an engagement hole 32d. The engagement hole 32d extends leftward from the tip of the non-lock hole 32c. The engagement hole 32d is formed in a U-shape. The lock hole 32b restricts the left-right movement of the pin 33 by engaging the gripping portion 35 when the pin 33 is inserted into the pin hole 34a (see FIG. 5A). That is, when the gripping portion 35 is located in the lock hole 32b, the pin 33 is inserted into the pin hole 34a, and the tailgate 9 is locked from opening downward. The non-lock hole 32c restricts the left-right movement of the pin 33 by engaging the gripping portion 35 when the pin 33 is disengaged from the pin hole 34a. That is, when the gripping portion 35 is located in the non-lock hole 32c, the pin 33 is disengaged from the pin hole 34a, and the tailgate 9 is unlocked from opening downward. Furthermore, when the gripping portion 35 is moved to the front end of the non-lock hole 32c, the gripping portion 35 is pushed leftward by the restoring force of the spring 38 provided inside the holder 31. As a result, the gripping portion 35 is locked in the U-shaped locking hole 32d. This prevents the pin 33 from unintentionally protruding from the holder 31 when the bottom-opening lock is released to discharge the soil loaded on the loading platform 4.

[0033] When opening the tailgate 9 upward, the upper hinge shaft 12 is released with the pin 33 inserted into the pin hole 34a. This allows the tailgate 9 to rotate from above to below around the pin 33 and the lower shaft 22. On the other hand, when opening the tailgate 9 downward, the pin 33 is released from the pin hole 34a with the upper hinge shaft 12 remaining fastened. This allows the tailgate 9 to rotate from below to above around the upper hinge shaft 12.

[0034] According to this embodiment, by sliding the gripping portion 35 along the groove 32, the pin 33 can be slid toward the pin hole 34a while being held by the holder 31. As shown in FIG. 5A, by inserting a part of the pin 33 into the pin hole 34a, the tailgate 9 can be locked from being opened downward. At this time, the pin 33 is inserted into the holder 31 fixed to the tail panel 8 and the pin hole forming member 34 connected to the tailgate 9. Therefore, when the tailgate 9 is opened upward, the pin 33 functions as a pivot shaft that rotatably supports the tailgate 9. When discharging the soil loaded on the loading platform 4, the gripping portion 35 can be slid in the opposite direction along the groove 32 to pull out the pin 33 from the pin hole 34a as shown in FIG. 5B. This releases the lock from being opened downward. Even after the lock is released, the pin 33 is held by the holder 31. Therefore, according to the dump truck 1 according to this embodiment, a chain for preventing the pin 33 from being lost is not required. When earth and sand is being discharged, the chain does not come into contact with the earth and sand. Therefore, the chain does not break and the pin 33 does not get lost. Also, when earth and sand is being discharged, the pin 33 is stored in the holder 31. The downward-opening lock mechanism 30 is not easily affected by earth and sand, and the pin 33 is unlikely to get lost.

[0035] According to this embodiment, the eaves 36 are disposed above at least a part of the holder 31. The eaves 36 are inclined backward and downward from the tail panel 8. This prevents soil from accumulating on the upper part of the holder 31 when the soil is discharged from the bed 4. If soil accumulates on the holder 31, it may be difficult to smoothly slide the gripping portion 35 along the groove hole 32. That is, it may be difficult to smoothly insert the pin 33 into the pin hole 34a and pull the pin 33 out of the pin hole 34a. However, according to this embodiment, soil is unlikely to accumulate on the holder 31, so that the pin 33 can be smoothly inserted into the pin hole 34a and pulled out of the pin hole 34a.

[0036] According to this embodiment, a spring 38 is provided inside the holder 31. The restoring force of the spring 38 acts on the pin 33 in the direction of inserting the pin 33 into the pin hole 34a. This makes it difficult for the pin 33 to come out of the pin hole 34a when locked in the downward opening position. This makes it possible to prevent the lock from being released unintentionally by the operator.

[0037] According to this embodiment, the holder 31 has a slot 32. The slot 32 is U-shaped and includes a slide hole 32a, a lock hole 32b, and a non-lock hole 32c. By engaging the grip 35 with the lock hole 32b or the non-lock hole 32c, the pin 33 can be prevented from moving unexpectedly. The slot 32 also has a lock hole 32d. The grip 35 is locked in the lock hole 32d by the restoring force of the spring 38. This prevents the pin 33 from jumping out of the holder 31 and being damaged when the soil loaded on the loading platform 4 is discharged.

[0038] Although one embodiment has been described above, the embodiment is merely an example, and various other embodiments are possible.

[0039] As shown in FIG. 8, the groove 32 may be oriented downward by 30° or more from the horizontal direction. For example, as shown in FIG. 8(a), the angle between the upper edge of the slide groove 32a and the horizontal line is θ1, and as shown in FIG. 8(b), the angle between the upper edges of the lock hole 32b and the non-lock hole 32c and the horizontal line is θ2. In this case, θ1 ≧ 30° and θ2 ≧ 30° may be satisfied. Also, as shown in FIG. 9, the gripping portion 35 may be configured to be bent. As a result, the groove 32 is oriented downward, so that soil is less likely to enter the groove 32 from above. Therefore, when soil loaded on the loading platform 4 is discharged, soil does not enter the inside of the holder 31. Therefore, the pin 33 is less likely to be damaged, and the pin 33 can be smoothly inserted into the pin hole 34a and pulled out of the pin hole 34a.

[0040] 10, the tip holding portion 40 with which the tip of the pin 33 engages may be attached to the tail panel 8 so as to be disposed on the side opposite the holder 31 of the pinhole forming member 34. This makes it possible to prevent the pin 33 from coming off the holder 31.

[0041] In the above embodiment, the tailgate lower metal fitting 20 is designed to be opened and closed automatically, but it may be designed to be opened and closed manually. Also, the tailgate lower metal fitting 20 is not necessarily required.

[0042] In the above embodiment, one downward-opening lock mechanism 30 is provided in the center in the left-right direction of the vehicle, but the position and the number of the downward-opening lock mechanisms 30 are not limited to this. As shown in Fig. 11A, the downward-opening lock mechanism 30 may be attached to two locations closer to the inside in the left-right direction of the vehicle than the tailgate lower metal fitting 20. Also, as shown in Fig. 11B, the downward-opening lock mechanism 30 may be attached to two locations closer to the outside in the left-right direction of the vehicle than the tailgate lower metal fitting 20. [Explanation of symbols]

[0043] 1. Dump truck 2 Chassis 4 Cargo platform 8 Tail Panel 9. Tailgate 10 Top Hinge 20 Tailgate lower bracket 30 Downward opening lock mechanism 31 Holder 32 Slot hole 32a Slide hole 32b Lock hole 32c Non-locking hole 32d locking hole 33 pin 34 Pin hole forming member 34a Pin hole 35 Gripping part 36 Eaves 38 Spring 40 Tip holding part

Claims

1. The chassis and a loading platform disposed on an upper portion of the chassis and having a tail panel; a tailgate provided at a rear portion of the cargo bed, at least a portion of which is located above the tail panel; an upper hinge provided at an upper portion of the tailgate and rotatably connecting the tailgate to the cargo bed; a downward opening lock mechanism provided on a lower portion of the tailgate and on the tail panel, The downward opening lock mechanism is a tubular retainer fixed to the tail panel and having a slot extending in the left and right direction; A pin slidably provided inside the retainer; a gripping portion extending radially outward from the pin and projecting outwardly from the retainer through the slot; a pin hole forming member connected to a lower portion of the tailgate, disposed to a side of the retainer, and having a pin hole opened toward the retainer; The tailgate of this dump truck is configured so that when the pin is held by the retainer and disengaged from the pin hole, it can be opened downward from below by the upper hinge, and when the pin is held by the retainer and inserted into the pin hole, it can be opened upward from above by using the pin as a pivot axis.

2. The dump vehicle according to claim 1 , further comprising a canopy disposed below the tailgate and above at least a portion of the retainer.

3. The dump truck according to claim 2 , wherein the eaves are inclined downward from the tail panel toward the rear.

4. 2. The dump vehicle according to claim 1, further comprising a spring disposed inside the retainer and biasing the pin toward the pin hole.

5. the pin is held by the holder so as to be rotatable about an axis of the pin; The slot is A slide hole extending to the left and right; a lock hole extending vertically from the slide hole and configured to restrict left and right movement of the pin by being engaged with the gripping portion when the pin is inserted into the pin hole; a non-locking hole that extends vertically from the slide hole, is formed at a position farther from the pin hole than the locking hole, and restricts left and right movement of the pin by being engaged with the gripping portion when the pin is disengaged from the pin hole; 5. The dump vehicle according to claim 1, further comprising: a locking hole extending from a tip of the non-locking hole toward the left or right, the locking hole being closer to the pin hole.

6. 2. The dump vehicle according to claim 1, wherein the slots are oriented downwardly at an angle of 30 degrees or more below the horizontal.

7. 2. The dump vehicle according to claim 1, further comprising a tip holding portion that is fixed to the tail panel, that is disposed on the opposite side of the pin hole forming member from the holder side, and that engages with the tip of the pin.

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