JPH08216769A - Gate supporting device for load-carrying platform of dump truck - Google Patents

Abstract

PURPOSE: To support the lower part of a gate to a load-carrying platform. CONSTITUTION: The load-carrying platform 2 disposed at the upper part of a frame is provided with a gate 3. A cutout part 6 is formed at a plate 5 provided at the lower part of the load carrying platform 2. A pin 9 is provided between supporting plates at the lower part of the gate 3. A recessed part 11 is formed at a holder 10 provided at the side part of the supporting plate 9. An engaging part 13 is formed at a supporting shaft 12 provided at the side of the plate 5. At the upward opening time of the gate 3 of the load-carrying platform 2, the load-carrying platform 2 is placed in the inclined dumping state to the frame. The pin 9 between the supporting plates 7, 8 is thereby going to come off outward of the load-carrying platform 2 from the cutout part 6 of the plate 5 by the own weight of the gate 3. The holder 10 moves downward in relation to the engaging part 13 of a supporting shaft 12, along with the supporting plate 8, and the inner surface of the cutout recessed part 11 of the holder 10 comes in contact with the engaging part 13 of the supporting shaft 12. The engaging part 13 of the supporting shaft 12 supports the gate 3 in the state of hanging downward of the load-carrying platform 2, together with the supporting plate 8 through the holder 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load carrier gate support device for a dump truck that supports a lower portion of the gate against the load carrier.

[0002]

2. Description of the Related Art Conventionally, a loading platform is tiltably disposed on an upper portion of a chassis frame, a gate is provided on the loading platform so as to be openable and closable, an engaging plate is provided on a lower portion of the loading platform, and the engaging plate faces outward of the loading platform. A fitting part that opens is formed, a support is disposed below the gate, and a locking pin that fits horizontally into the fitting part of the engagement plate is provided on the support, and a locking pin is provided on the side of the engagement plate. A support shaft is provided in the same direction, a bearing body that engages with and disengages from the support shaft is provided on a side portion of the support body, and a notch groove that opens in a direction opposite to the opening direction of the fitting portion of the engagement plate is formed in the bearing body. A gate support device for a loading platform of a dump truck in which both ends of the upper portion of the gate are detachably connected to an upper portion of the loading platform via hinges has been proposed as Japanese Utility Model Laid-Open No. 5-32108.

[0003]

[Problems to be Solved by the Invention]
No. 32108 discloses that, when the cargo bed gate is opened upwardly and opened, when the cargo bed is in a dumped state in which it is inclined with respect to the chassis frame, the locking pin of the support body moves from the fitting portion of the engagement plate to the cargo bed due to the weight of the gate. At the same time, the bearing body moves together with the support body toward the lower part of the carrier with respect to the support shaft, the inner surface of the bearing body contacts the support shaft, and the gate is inserted through the bearing body. Is supported by the support shaft in a state of being hung below the loading platform, and only the fitting portion of the engaging plate is opened toward the outside of the loading platform.
Since the dimensional accuracy of the engaging part of the engaging plate cannot be made rough, the shape of the engaging part of the engaging plate is not simple, the engaging part of the engaging plate cannot be easily processed, and the bearing body has a cylindrical shape. However, there was a risk that foreign matter such as earth and sand would be clogged inside the bearing body.

SUMMARY OF THE INVENTION It is an object of the present invention to address the above mentioned problems and to release the hinged connection of the upper ends of the gate to the upper part of the bed so that the gate is locked between the first and second supports. The first and second support bodies rotate together with the gate with respect to the cutout portion of the locking body, and the lock pin moves to the cutout portion of the locking body only by rotating the pin around the pin as a fulcrum. While engaging, it rotates together with the first and second supports, and the locking body supports the gate together with the first and second supports through the lock pin in a state in which the gate is hung below the bed, Of the gate is opened upward, and the gate holding body rotates together with the second support body around the engaging portion of the support shaft so that the engaging portion of the support shaft remains in the notch recess of the gate holding body. State, and when opening and opening the gate of the loading platform, place the loading platform against the chassis frame. Even in the inclined dump state, the lock pin between the first and second supports tries to come off from the notch of the locking body toward the outside of the loading platform due to the weight of the gate, and the gate holding body moves to the second position. Together with the support of the support shaft, it moves downward of the carrier with respect to the support shaft engaging portion, the inner surface of the notch recess of the gate holding body contacts the support shaft engaging portion, and the gate is supported via the gate holding body. The shaft is supported by the engaging portion of the shaft in a state of being hung below the luggage carrier, and when the gate of the luggage carrier is opened upward, the opening direction of the notch concave portion of the gate holder faces the outside of the luggage carrier, and the support shaft is engaged. The joint does not slip out of the notch in the gate retainer to prevent the gate from falling from the locking body, and even if the load loaded on the loading platform is large, the gate should not interfere with the discharge of the loading from the loading platform. First, slide a large load off the carrier and remove the notch Opening upward and outward of the table, the dimensional accuracy of the notch part of the locking body can be made rougher than before, the shape of the notch part of the locking body is simple, and the processing of the notch part of the locking body is easy Another object of the present invention is to provide a gate support device for a loading platform of a dump truck, which can make the gate holder plate-shaped and can prevent foreign matters such as earth and sand from being clogged in the notched concave portion of the gate holder.

[0005]

A gate support device for a cargo bed of a dump truck according to the present invention has a luggage frame tiltably disposed on an upper portion of a chassis frame, and a gate is provided on the cargo platform so as to be openable and closable.
In a gate support device for a loading platform of a dump truck, wherein upper ends of the gate are detachably connected to an upper portion of the loading platform via hinges, a locking body is provided at a lower portion of the loading platform, and the locking body is provided above the loading platform. And a notch that opens outward, and at the bottom of the gate, first and second support bodies that are parallel to each other and face both sides of the locking body are provided, and the first and second support bodies are provided. Lock pins that engage with the cutouts of the locking body along the horizontal direction are provided between the support members, and a plate-shaped gate holding member is provided on a side portion of the second support member. A notch concave portion that opens toward the inside of the luggage carrier is formed on the lock body, and a support shaft that projects outward of the luggage carrier is provided on the side of the locking body, and the support shaft is coaxial with the lock pin. An engaging portion that engages and disengages with the notched concave portion of the gate holder is formed. And it has a structure in which the symptoms.

[0006]

Operation: First, after releasing the connection between the upper ends of the gate to the upper part of the cargo bed by the hinges, the gate is moved to the first and second positions.
When the lock pins between the support members are rotated toward the lower side of the loading platform as the fulcrum, the first and second support members are rotated together with the gate with respect to the cutout portions of the lock members, and the lock pins are locked. A state in which the gate rotates together with the first and second support bodies while engaging with the cutout portion of the body, and the locking body hangs the gate together with the first and second support bodies via the lock pin below the luggage carrier. And the gate of the loading platform is opened upward, the gate holder rotates with the second support around the engaging portion of the support shaft, and the engaging portion of the support shaft causes the notch recess of the gate holding body. It will be in a state where it has entered.

When the gate of the loading platform is opened and opened, and the loading platform is in a dump state in which the loading frame is inclined with respect to the chassis frame, the lock pin between the first and second supports is locked by the weight of the gate. Attempting to come off from the notch toward the outside of the luggage carrier, the gate holder moves together with the second support member toward the lower portion of the luggage carrier with respect to the engaging portion of the support shaft, and at the same time, the notch recess of the gate holder. The inner surface of the shaft contacts the engaging portion of the support shaft, and the engaging portion of the support shaft supports the gate together with the second support through the gate holding body in a state of being suspended under the luggage carrier.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 is a chassis frame, and a cargo bed 2 is tiltably arranged on the chassis frame 1, and a tailgate 3 is opened and closed on the cargo bed 2 as shown in FIG. Both ends of the upper portion of the tailgate 3 are detachably connected to the upper portion of the rear end of the loading platform 2 via hinges 4.

As shown in FIGS. 1 and 2, a lock plate 5 serving as a locking body is provided at the lower portion of the luggage carrier 2, and the lock plate 5 is provided above the luggage carrier 2 as shown in FIG. A notch 6 that opens outward is formed.

As shown in FIG. 3, under the tailgate 3, support plates 7 and 8 serving as first and second supports, which face both sides of the lock plate 5 and are parallel to each other, are provided. As shown in FIG. 4, a lock pin 9 that engages with the notch 6 of the lock plate 5 is provided between the support plates 7 and 8 along the horizontal direction.

As shown in FIGS. 3 and 4, a gate holder 10 serving as a plate-shaped gate holder is provided on a side portion of the support plate 8. The gate holder 10 has a gate holder 10 as shown in FIG.
A cutout recess 11 is formed which opens inwardly of the loading platform 2.

On the side of the lock plate 5, as shown in FIGS. 3 and 4, the support shaft 1 protruding toward the outside of the luggage carrier 2 is provided.
2 is provided, and the support shaft 12 is formed with an engagement portion 13 that engages with and disengages from the cutout recess 11 of the gate holder 10 in the direction coaxial with the lock pin 9, as shown in FIGS.

As shown in FIG. 1, a subframe 14 is disposed on the chassis frame 1, and the subframe 1 is provided.
At the rear end of the vertical member 15 of 4, the lower part of the rear end of the loading platform 2 is hinged 1.
It is rotatably connected via 6.

On the upper portion of the vertical member 15 of the sub-frame 14,
As shown in FIG. 1, a loading platform 2 is arranged and a floorboard 1 of the loading platform 2 is arranged.
A vertical member 18 is provided in the lower portion of the member 7 along the longitudinal direction of the vertical member 15 of the sub-frame 14, and a bracket 19 of a hinge 16 is provided outside the rear end of the vertical member 18.

As shown in FIG. 1, a support pin 20 projecting outward is provided near the front edge between the upper end and the center of the bracket 19, and the front end of the bracket 19 near the front edge is provided. Is provided with a receiving plate 21 protruding outward, and a locking hole 22 is formed in the receiving plate 21.

At the rear end of the vertical member 15 of the sub-frame 14, as shown in FIG. 1, the hinge 1 protruding outwardly.
6 pivots 23 are provided on which the bracket 19
The lower end of the bracket 19 is rotatably supported, a washer 24 is fitted near the tip of the pivot 23, and the lower end of the bracket 19 is locked to the pivot 23 by a retaining pin (not shown).

As shown in FIG. 1, the hinge 16 is composed of a bracket 19 and a pivot 23.

A lock arm 25 is provided outside the bracket 19 as shown in FIG.
A locking claw 26 bent downward is formed at one end of the lock arm 25, and a receiving plate 27 protruding upward is provided between one end and the center of the lock arm 25, and the locking plate 25 is locked to the receiving plate 27. A hole 28 is provided.

As shown in FIG. 1, an arm holder 29 is provided near the center of the lock arm 25, and side walls 30 and 30 are formed on both sides of the lock arm 25 in the arm holder 29. Side walls 30, 30
A supporting hole (not shown) is formed in each of the side walls 30 of the arm holder 29, and a bracket 19 is formed in the supporting hole.
Support pin 20 of the bracket 19 is inserted, a washer 31 is fitted near the tip of the support pin 20 of the bracket 19, and the side walls 30, 30 of the arm holder 29 are attached to the support pin 20 of the bracket 19 by retaining pins (not shown). ), The lock arm 25 is rotatably supported by the support pin 20 of the bracket 19 via the arm holder 29.

A tension coil spring 32 is arranged between the receiving plate 21 of the bracket 19 and the receiving plate 27 of the lock arm 25, as shown in FIG.
One end of a tension coil spring 32 is hooked and locked to the tension coil spring 32, and the tension coil spring 32 is locked in the locking hole 28 of the receiving plate 27.
The other end of the lock arm 25 is hooked and locked, and one end of the lock arm 25 is always pulled upward toward the loading platform 2 by the pulling force of the tension coil spring 32.

Outside the vertical member 15 of the sub-frame 14,
As shown in FIG. 1, a vertical plate 33 is arranged at a position corresponding to a lower portion near the other end of the lock arm 25, and a protruding piece bent outward at a right angle is provided at an upper edge of the vertical plate 33. 34 is formed, a screw hole 35 is provided in the center of the protruding piece 34 of the vertical plate 33 along the vertical direction, and a bolt 36 that serves as a stopper is provided in the screw hole 35 of the protruding piece 34 of the vertical plate 33 from above. The bolt 36 is fixed to the screw hole 35 of the protruding piece 34 of the vertical plate 33 by the nut 37.

As shown in FIG. 1, the lower surface of the lock arm 25 near the other end of the bolt 36 is pressed against the head 36a of the bolt 36 by the tensile force of the tension coil spring 32, and the bolt 36 is fixed to the tension coil spring 32 of the lock arm 25. Rotation of the bracket 19 with respect to the support pin 20 due to a pulling force is prevented.

As shown in FIGS. 1 and 2, a tailgate 3 is arranged at the rear end of the loading platform 2, and a tailgate 3 is provided below the tailgate 3 as shown in FIG. Parallel support plates 7 and 8 are provided respectively,
As shown in FIG. 4, a lock pin 9 is provided between the lower ends of the lock pins 9.
Is suspended.

As shown in FIG. 2, fixed brackets 38 of the hinge 4 rising upward are provided on both upper sides of the rear end of the luggage carrier 2, and the fixed brackets 38 are provided near the upper edge thereof. Has a through hole 39.

As shown in FIG. 2, movable tail brackets 40 of hinges 4 which rise obliquely upward are provided at both ends of the upper portion of the tail gate 3, and fixed to the upper end of the movable bracket 40. A through hole 41 communicating with the through hole 39 of the side bracket 38 is formed.

A through hole 39 in the fixed bracket 38 of the loading platform 2
And the through hole 4 of the movable side bracket 40 of the tailgate 3
As shown in FIG. 2, the connecting pin 42 of the hinge 4 is inserted into the movable bracket 1 of the tailgate 3 and the fixed bracket 38 of the luggage carrier 2 is rotatably connected to the fixed bracket 38 of the luggage carrier 2 through the connecting pin 42. ing.

As shown in FIG. 2, the hinge 4 includes a fixed side bracket 38, a movable side bracket 40 and a connecting pin 42.
It consists of

As shown in FIGS. 1 and 2, a rear plate 43 is provided below the rear end of the loading platform 2, and an opening 44 is formed in the rear plate 43 as shown in FIGS. 3 and 4. And the rear plate 43
In the opening 44 of the lock arm 2 as shown in FIG.
One end of 5 is projected toward the rear of the loading platform 2.

As shown in FIGS. 3 and 4, on one side of the opening 44 of the rear plate 43, there is provided a lock plate 5 projecting toward the rear of the luggage carrier 2, and the lock plate 5 has a structure as shown in FIG. As shown in FIG. 2, a notch 6 that opens upward and rearward of the luggage carrier 2 is formed, and an arc surface 45 is formed in the notch 6 of the lock plate 5, so that the notch of the lock plate 5 is formed. The outer peripheral surface of the lock pin 9 between the supporting plates 7 and 8 below the tailgate 3 is engaged with the circular arc surface 45 of the reference numeral 6.

As shown in FIGS. 3 and 4, the locking claw 26 of the lock arm 25 is hooked and locked to the lock pin 9 between the support plates 7 and 8 below the tailgate 3, As shown in FIG. 1, the lock pin 9 under the tailgate 3
Is fastened to the rear plate 43 at the lower rear end of the loading platform 2 by the notch 6 of the lock plate 5 and the locking claws 26 of the lock arm 25. As shown in FIG. The tailgate 3 is closed by a lock arm 25 via a lock pin 9.

As shown in FIG. 3, a gate holder 10 is provided on the side of the support plate 8 opposite to the lock plate 5, and the end of the horizontal portion 46 of the gate holder 10 is shown in FIG. Thus, a hanging piece 47 parallel to the support plate 8 bent downward is formed, and the hanging piece 47 of the gate holder 10 is opened toward the front of the loading platform 2 as shown in FIG. A notched recess 11 is formed.

On the side of the lock plate 5 of the rear plate 43,
As shown in FIGS. 3 and 4, a support shaft 12 protruding rearward of the luggage carrier 2 is provided, and one end of the support shaft 12 has the same center as the lock pin 9 as shown in FIGS. 5 and 6. An engaging portion 13 that is bent at a right angle toward the support plate 8 is formed on the axis, and a mounting portion 48 that is bent at a right angle in the opposite direction to the engaging portion 13 is formed at the other end of the support shaft 12. Is formed and the support shaft 12 is formed.
The mounting portion 48 is fixed to the rear plate 43 by welding.

As shown in FIGS. 3 and 4, the engaging portion 13 of the support shaft 12 is fitted into the cutout recess 11 of the hanging piece 47 of the gate holder 10, and the cutout recess 11 of the hanging piece 47 of the gate holder 10 is inserted. As shown in FIG. 5, a gap is formed between the inner surface of the support shaft 12 and the outer peripheral surface of the engaging portion 13 of the support shaft 12, and as shown in FIG. Support plate 7,
It is in a state of being coincident with the central axis of the lock pin 9 between the positions 8 and 8.

A hydraulic cylinder 49 (see FIG. 8) as a platform tilting means is arranged between the chassis frame 1 and the platform 2, and the base end of the cylinder tube 50 of the hydraulic cylinder 49 rotates on the chassis frame 1. Freely supported, the tip end of a piston rod 51 of a hydraulic cylinder 49 is rotatably connected to a vertical member 18 at the bottom of the loading platform 2, and a hydraulic supply for supplying pressurized oil to a cylinder tube 50 of the hydraulic cylinder 49. A hydraulic pump (not shown) is connected as a means.

Next, the operation of this embodiment will be described. First, from the position where the loading platform 2 is placed on the vertical member 15 of the sub-frame 14 parallel to the chassis frame 1 shown in FIG.
When the vertical member 18 is extended, the vertical member 18 rotates in the clockwise direction in FIG. 1 with the pivot 19 of the hinge 16 together with the bracket 19 as the piston rod 51 of the hydraulic cylinder 49 extends. With the rotation of 18, the vertical frame 15 of the sub-frame 14 rises upward, and as shown in FIG. 8, the platform 2 is in a rear dump state in which it is inclined forward with respect to the chassis frame 1.

By rotating the hinge 16 with respect to the pivot 23 along with the extension of the piston rod 51 of the hydraulic cylinder 49 of the vertical member 18, the lower surface of the lock arm 25 near the other end is moved to the vertical member 1.
With the rotation of 8, the bolt 36 is detached upward from the head portion 36a of the bolt 36, and the lock arm 25 causes the tension coil spring 3 to move.
Bracket 1 together with arm holder 29 by the pulling force of 2
9 is rotated counterclockwise about the support pin 20 as a fulcrum, and as shown in FIG. 9, the upper surface near one end of the lock arm 25 comes into contact with the upper edge of the opening 44 of the rear plate 43. Board 43
The upper edge of the opening 44 prevents the bracket 19 from rotating with respect to the support pin 20 by the pulling force of the tension coil spring 32 of the lock arm 25.

By rotating the bracket 19 with respect to the support pin 20 by the tensile force of the tension coil spring 32 of the lock arm 25, as shown in FIG. 9, the locking claw 26 of the lock arm 25 causes the support plate 7 under the tailgate 3 to move. , The lock pin 9 between the lock gates 9 and 8 is released, and the rear portion of the lower rear end of the loading platform 2 is formed by the notch 6 of the lock plate 5 of the lock pin 9 below the tailgate 3 and the locking claw 26 of the lock arm 25. Board 4
Release the lock on 3.

As the vertical member 18 at the front end of the loading platform 2 is rotated, the sub-frame 14 is lifted up to raise the vertical member 15, so that the tailgate 3 moves together with the movable bracket 40 and the connecting pin 42 of the hinge 4 by its own weight. As the fulcrum rotates counterclockwise in FIG. 2, at the same time, the support plates 7 and 8 are attached to the tailgate 3.
9 is moved toward the rear of the loading platform 2 from the vicinity of the rear plate 43 with the rotation of the lock plate 9, and as shown in FIG. From the rear side of the loading platform 2 and the outer peripheral surface of the lock pin 9 is released from the circular arc surface 45 of the notch 6 of the lock plate 5, and the tailgate 3 at the rear end of the loading platform 2 is removed as shown in FIG. Open to the bottom.

When the support plates 7 and 8 are moved from the vicinity of the rear plate 43 to the rear of the loading platform 2 in accordance with the rotation of the tailgate 3, the hanging pieces 47 of the gate holder 10 together with the support plate 8 support the spindle 12.
9 and 10, the engaging portion 13 of the support shaft 12 slips out of the notch recess 11 of the hanging piece 47 of the gate holder 10, as shown in FIGS. 9 and 10. It becomes a state.

When the piston rod 51 of the hydraulic cylinder 49 is retracted by the weight of the platform 2 from the position of the rear dump state in which the platform 2 is inclined forward and upward with respect to the chassis frame 1 shown in FIG. As the piston rod 51 of the cylinder 49 contracts, the bracket 19
At the same time, the hinge 23 pivots counterclockwise in FIG. 9 around the pivot 23 as a fulcrum, and at the same time, the front end of the loading platform 2 descends toward the upper portion of the vertical member 15 of the sub-frame 14 as the vertical member 18 rotates. As shown in FIG. 7, the loading platform 2 returns to the original state in which it is placed on the vertical member 15 of the sub-frame 14 parallel to the chassis frame 1.

When the vertical member 18 at the front end of the loading platform 2 is rotated, the sub-frame 14 is lowered to the upper part of the vertical member 15, so that the tailgate 3 moves together with the movable bracket 40 and the connecting pin 42 of the hinge 4 by its own weight. As the fulcrum rotates in the clockwise direction in FIG. 10, the support plates 7 and 8 are simultaneously moved to the tailgate 3
1 moves toward the vicinity of the rear plate 43 from the rear of the loading platform 2 while rotating, and as shown in FIG. 1, the lock pin 9 moves from the rear of the loading platform 2 while the supporting plates 7 and 8 move. 5, the outer peripheral surface of the lock pin 9 engages with the circular arc surface 45 of the cutout portion 6 of the lock plate 5,
As shown in FIG. 2, the rear end of the loading platform 2 is closed by the tailgate 3.

When the support plates 7 and 8 are moved from the rear of the luggage carrier 2 to the vicinity of the rear plate 43 as the tailgate 3 is rotated, the hanging piece 47 of the gate holder 10 is supported together with the support plate 8 from the rear of the luggage carrier 2. The shaft 12 moves toward the engaging portion 13 of the shaft 12, and as shown in FIG.
In this state, the hanging piece 47 has entered the notched concave portion 11.

The lower surface of the lock arm 25 near the other end of the vertical member 1 is rotated by the rotation of the hinge 16 with respect to the pivot shaft 23 due to the contraction of the piston rod 51 of the hydraulic cylinder 49 of the vertical member 18.
9, the lock arm 25 comes into contact with the head 36a of the bolt 36 while the lock arm 25 resists the tensile force of the tension coil spring 32, and the support pin 20 of the bracket 19 is used as a fulcrum together with the arm holder 29 in the clockwise direction of FIG. Rotate, Figure 1
As shown in FIG. 5, the bolt 36 blocks the rotation of the bracket 19 with respect to the support pin 20 by the tensile force of the tension coil spring 32 of the lock arm 25.

By rotating the bracket 19 with respect to the support pin 20 against the tensile force of the tension coil spring 32 of the lock arm 25, the locking claw 26 of the lock arm 25 supports the lower portion of the tailgate 3 as shown in FIG. The lock pin 9 between the plates 7 and 8 is hooked and locked, and the lock pin 9 at the lower portion of the tailgate 3 is locked by the notch 6 of the lock plate 5 and the locking claw 26 of the lock arm 25 at the rear end of the loading platform 2. The lower rear plate 43 is secured, and the lower portion of the tailgate 3 at the rear end of the loading platform 2 is closed by the lock arm 25 via the lock pin 9, as shown in FIG.

Further, in the state where the loading platform 2 is placed on the vertical member 15 of the sub-frame 14 parallel to the chassis frame 1 shown in FIG.
From the through hole 39 of the fixed side bracket 38 of the loading platform 2 and the through hole 41 of the movable side bracket 40 of the tailgate 3 to remove the loading platform 2 of the movable side bracket 40 of the tailgate 3.
Connecting pin 4 of hinge 4 to fixed side bracket 38 of
Release the connection by 2.

After that, when the tailgate 3 is rotated in the clockwise direction of FIG. 2 with the lock pin 9 between the supporting plates 7 and 8 as a fulcrum by hand while resisting its own weight, the supporting plates 7 and 8 are moved to the tailgate 3 At the same time, the lock pin 9 is rotated clockwise with respect to the cutout portion 6 of the lock plate 5, and at the same time, the lock pin 9 is engaged with the arcuate surface 45 of the cutout portion 6 of the lock plate 5 and the locking claw 26 of the lock arm 25. While rotating in the clockwise direction in FIG. 1 together with the support plates 7 and 8, as shown in FIG. 11, the locking claw 26 of the lock arm 25 causes the lock pin 9 between the support plates 7 and 8 above the tailgate 3. And locks the lock pin 9 on the upper part of the tailgate 3 to the rear plate 43 at the lower rear end of the loading platform 2 by the notch 6 of the lock plate 5 and the locking claw 26 of the lock arm 25. Then, as shown in FIG. 12, rock play 5 of notch 6 and the lock arm 25
The locking claw 26 supports the tailgate 3 with the support plates 7 and 8 via the lock pin 9 in a state of being hung below the luggage carrier 2, and opens the tailgate 3 at the rear end of the luggage carrier 2 to open upward. .

By rotating the support plates 7 and 8 with respect to the cutout portion 6 of the lock plate 5, the hanging piece 47 of the gate holder 10 is provided.
Rotates around the engaging portion 13 of the support shaft 8 in the counterclockwise direction of FIG. 5 together with the support plate 8, and as shown in FIG. 13, the opening direction of the notch concave portion 11 of the hanging piece 47 of the gate holder 10 is the loading platform. Two
Facing toward the rear of the gate holder 1 with the engaging portion 13 of the support shaft 12
It remains in the notched concave portion 11 of the hanging piece 47 of 0.

When the piston rod 51 of the hydraulic cylinder 49 is extended from the position where the loading platform 2 is placed on the vertical member 15 of the sub-frame 14 parallel to the chassis frame 1 shown in FIG. While the piston rod 51 of the hydraulic cylinder 49 is extended, the bracket 19 is rotated in the clockwise direction in FIG. 11 with the pivot 23 of the hinge 16 as a fulcrum, and at the same time, the front end of the luggage carrier 2 is rotated as the vertical member 18 is rotated. Ascending upwards of the vertical member 15 of the frame 14, as shown in FIG. 15, the loading platform 2 is in a rear dump state in which it is inclined forward with respect to the chassis frame 1.

By rotating the hinge 16 with respect to the pivot shaft 23 as the piston rod 51 of the hydraulic cylinder 49 of the vertical member 18 extends, the lower surface of the lock arm 25 near the other end of the vertical member 1 extends.
With the rotation of 8, the bolt 36 is detached upward from the head portion 36a of the bolt 36, and the lock arm 25 causes the tension coil spring 3 to move.
Bracket 1 together with arm holder 29 by the pulling force of 2
The support pin 20 of 9 is rotated counterclockwise in FIG. 11, and as shown in FIG. 16, the upper surface near one end of the lock arm 25 abuts the upper edge of the opening 44 of the rear plate 43. The upper edge of the opening 44 of the plate 43 is the support pin 2 of the bracket 19 by the tensile force of the tension coil spring 32 of the lock arm 25.
Prevent rotation from zero.

By rotating the bracket 19 with respect to the support pin 20 by the tensile force of the tension coil spring 32 of the lock arm 25, as shown in FIG. 16, the locking claw 26 of the lock arm 25 causes the support plate 7 on the upper portion of the tailgate 3. , The lock pin 9 between the lock gates 8 and 8 is released, and the rear end lower part of the rear end of the loading platform 2 is formed by the notch 6 of the lock plate 5 of the lock pin 9 above the tailgate 3 and the locking claw 26 of the lock arm 25. The securing to the plate 43 is released.

As the vertical member 18 at the front end of the loading platform 2 is rotated, the sub-frame 14 is lifted up to raise the vertical member 15, so that the lock pin 9 between the support plates 7 and 8 is locked by the weight of the tailgate 3. The plate 5 slightly moves from the notch 6 toward the rear of the loading platform 2, and the outer peripheral surface of the lock pin 9 is separated from the arc surface 45 of the notch 6 of the lock plate 5 as shown in FIGS. 16 and 17. , The hanging piece 47 of the gate holder 10 moves together with the support plate 8 toward the lower part of the loading platform 2 with respect to the engaging portion 13 of the support shaft 12, and the central axis of the lock pin 9 moves to the support shaft 12.
18 is slightly displaced below the central axis of the engaging portion 13, and as shown in FIG. 18, the notch recess 1 of the hanging piece 47 of the gate holder 10
The inner surface of 1 comes into contact with the outer peripheral surface of the engaging portion 13 of the support shaft 12, and the engaging portion 13 of the support shaft 12 suspends the tailgate 3 together with the support plate 8 below the luggage carrier 2 via the gate holder 10. Support the state.

Further, the piston rod 51 of the hydraulic cylinder 49 is moved from the position in the rear dump state where the loading platform 2 is inclined forward and upward with respect to the chassis frame 1 shown in FIG.
If the vertical member 18 contracts due to its own weight,
Bracket 1 as the piston rod 51 of the
16 together with the pivot shaft 23 of the hinge 16 as a fulcrum, the front end portion of the luggage carrier 2 is rotated in the counterclockwise direction in FIG.
With the rotation of 8, the vertical members 15 of the sub-frame 14 descend toward the upper part of the vertical member 15, and as shown in FIG.
Return to the original state of the top of 5.

As the vertical member 18 at the front end of the loading platform 2 rotates, the sub-frame 14 descends to the upper part of the vertical member 15, so that the lock pin 9 between the support plates 7 and 8 resists the weight of the tailgate 3. While moving slightly from the rear of the loading platform 2 toward the notch 6 of the lock plate 5, the outer peripheral surface of the lock pin 9 is an arc surface 45 of the notch 6 of the lock plate 5 as shown in FIGS. 11 and 12. And the hanging piece 4 of the gate holder 10
7 moves upward with respect to the engaging portion 13 of the support shaft 12 together with the support plate 8, and the central axis of the lock pin 9 coincides with the central axis of the engaging portion 13 of the support shaft 12, as shown in FIG. As described above, the inner surface of the cutout recess 11 of the hanging piece 47 of the gate holder 10 is not in contact with the outer peripheral surface of the engaging portion 13 of the support shaft 12.

By rotating the hinge 16 with respect to the pivot shaft 23 as the hydraulic cylinder 49 of the vertical member 18 retracts, the lower surface of the lock arm 25 near the other end of the vertical member 1 is moved.
16, the lock arm 25 abuts against the head portion 36a of the bolt 36, and the lock arm 25 resists the tensile force of the tension coil spring 32, and the support pin 20 of the bracket 19 together with the arm holder 29 serves as a fulcrum in the clockwise direction of FIG. As shown in FIG. 11, the bolt 36 blocks the rotation of the bracket 19 with respect to the support pin 20 by the tensile force of the tension coil spring 32 of the lock arm 25.

By rotating the bracket 19 with respect to the support pin 20 against the tensile force of the tension coil spring 32 of the lock arm 25, as shown in FIG. 11, the locking claw 26 of the lock arm 25 supports the upper portion of the tailgate 3. The lock pin 9 between the plates 7 and 8 is hooked and locked, and the lock pin 9 on the upper part of the tailgate 3 is locked by the notch 6 of the lock plate 5 and the locking claw 26 of the lock arm 25 at the rear end of the loading platform 2. The lower plate 43 is fixed to the rear plate 43, and as shown in FIG. 12, the notch 6 of the lock plate 5 and the locking claw 2 of the lock arm 25.
6 supports the tailgate 3 with the support plates 7 and 8 via the lock pin 9 in a state of being hung below the platform 2.

Next, when the tailgate 3 is rotated counterclockwise in FIG. 12 with the lock pin 9 between the supporting plates 7 and 8 as a fulcrum by hand while resisting its own weight, the supporting plates 7 and 8 are moved to the tailgate. 11, the lock pin 9 engages with the arcuate surface 45 of the notch 6 of the lock plate 5 and the locking claw 26 of the lock arm 25 at the same time as the lock pin 5 rotates counterclockwise with respect to the notch 6 of the lock plate 5. Support plates 7, 8 while fitting
At the same time, it rotates counterclockwise in FIG. 11, and as shown in FIG. 1, the locking claw 26 of the lock arm 25 hooks the lock pin 9 between the support plates 7 and 8 at the lower part of the tailgate 3 and engages. Then, the lock pin 9 at the lower portion of the tailgate 3 is fixed to the rear plate 43 at the lower rear end of the loading platform 2 by the notch portion 6 of the lock plate 5 and the locking claw 26 of the lock arm 25.
As shown in, the rear end of the cargo bed 2 is closed by the tailgate 3.

By rotating the support plates 7 and 8 with respect to the cutout portion 6 of the lock plate 5, the hanging piece 47 of the gate holder 10 is provided.
13 around the engaging portion 13 of the support shaft 12 together with the support plate 8.
5 in the counterclockwise direction, and as shown in FIG.
Facing forward, the engaging portion 13 of the support shaft 12 has the gate holder 1
It remains in the notched concave portion 11 of the hanging piece 47 of 0.

After that, the connecting pin 42 of the hinge 4 is attached to the loading platform 2
39 and the tailgate 3 of the fixed bracket 38 of the
Through the through hole 41 of the movable side bracket 40, the movable side bracket 40 of the tailgate 3 is connected to the fixed side bracket 38 of the loading platform 2 by the connecting pin 42 of the hinge 4, and as shown in FIG. Tailgate 3 at the rear end of 2
Is closed by the connecting pin 42 of the hinge 4.

In the above-described embodiment, the rear dump truck in which the platform is tilted rearward with respect to the chassis frame has been described. However, the gate support device for the platform of the dump truck according to the present invention has tails at the rear end and both sides of the platform. It is also possible to provide a gate and a side gate that can be opened and closed, respectively, and to use the loading platform in a three-wheeled dump truck in which the platform is tilted in either the rearward or leftward or rightward direction with respect to the chassis frame.

[0061]

As described above, according to the gate supporting device for the bed of the dump truck of the present invention, the first and second gates are released by releasing the connection between the upper ends of the gate to the upper part of the bed. The lock pin between the second supports is only used as a fulcrum to rotate downwards toward the bottom of the luggage carrier.
And the second support body rotates together with the gate with respect to the cutout portion of the locking body, so that the lock pin rotates with the first and second support bodies while engaging the cutout portion of the locking body. The lock body supports the gate together with the first and second support bodies via the lock pin in a state of being hung below the luggage carrier, so that the gate of the luggage carrier can be opened upward.
Since the gate holding body rotates around the engaging portion of the support shaft together with the second supporting body, the engaging portion of the support shaft can be kept in the notched concave portion of the gate holding body.

Further, when the gate of the loading platform is opened and opened, even if the loading platform is in a dump state in which it is inclined with respect to the chassis frame, the lock pin between the first and second supports is locked by the weight of the gate. Since it tries to come off from the cutout portion toward the outside of the luggage carrier, the gate holder can be moved together with the second support member toward the lower side of the luggage carrier with respect to the engaging portion of the support shaft, and the gate holder can be held. Since the inner surface of the cutout concave portion of the body contacts the engaging portion of the support shaft, the gate can be supported by the engaging portion of the support shaft in a state of being suspended below the luggage carrier through the gate holding body. When the gate is opened upward, the opening of the cutout recess of the gate holder faces the outside of the luggage carrier, so that the engaging portion of the support shaft does not come off from the cutout recess of the gate holder, and the engagement of the gate is prevented. It is possible to prevent falling from the stopper, Even if the cargo has been loaded on the platform is great, not obstruct the discharge of the cargo gate from loading platform, you can drop sliding large cargo from the loading platform.

Further, since the notch portion of the locking body is opened upward and outward of the loading platform, the dimensional accuracy of the notch portion of the locking body can be made coarser than in the past, and the notch portion of the locking body can be made. Since the shape of is simple, the notch of the locking body can be easily processed, and the gate holder is plate-shaped so that foreign matter such as earth and sand does not get stuck in the notch recess of the gate holder. can do.

[Brief description of drawings]

FIG. 1 is an enlarged side sectional view of an essential part of a gate support device for a bed of a dump truck according to an embodiment of the present invention.

FIG. 2 is a side sectional view of an essential part showing a closed state by a tailgate at the rear end of the loading platform.

FIG. 3 is a perspective view of a main part of FIG.

FIG. 4 is a front view of a main part of FIG.

5 is a side sectional view of the main part of FIG.

6 is a cross-sectional view of the main part of FIG.

FIG. 7 is a schematic side view of a dump truck equipped with a gate support device for a cargo bed of the present invention.

FIG. 8 is a schematic side view of the dump truck showing a rear dump state with respect to the chassis frame of the loading platform.

FIG. 9 is an enlarged side sectional view of an essential part showing a state where the tailgate is opened downwardly at the time of rear dumping with respect to the chassis frame of the loading platform.

FIG. 10 is a side sectional view of an essential part showing a state where the tailgate at the rear end of the loading platform is opened downward.

FIG. 11 is an enlarged side sectional view of an essential part showing a state in which the tailgate at the rear end of the loading platform is opened upward.

FIG. 12 is a side sectional view of an essential part showing a state in which a tailgate lock plate and a lock arm are suspended from a luggage carrier.

13 is a front sectional view of a main part of FIG.

FIG. 14 is a schematic side view of the dump truck when the tailgate at the rear end of the loading platform is opened upward.

FIG. 15 is a schematic side view of the dump truck showing a rear dump state with respect to the chassis frame of the loading platform.

FIG. 16 is an enlarged side cross-sectional view of an essential part showing the upper opening state of the tailgate at the time of rear dumping with respect to the chassis frame of the loading platform.

FIG. 17 is a side sectional view of an essential part showing the released state of the lock of the lock pin on the upper part of the tailgate by the lock arm.

FIG. 18 is a side cross-sectional view of a main portion showing a state in which the tailgate support shaft is suspended from the luggage carrier by an engaging portion.

[Explanation of symbols]

 1 Chassis Frame 2 Loading Platform 3 Tailgate 4 Hinge 5 Lock Plate 6 Notch 7 Support Plate 8 Support Plate 9 Lock Pin 10 Gate Holder 11 Notch Recess 12 Spindle 13 Engagement Part 14 Subframe 15 Vertical Member 16 Hinge 17 Floorboard 18 Vertical Material 19 Bracket 20 Support pin 21 Receiving plate 22 Locking hole 23 Axis 24 Washer 25 Lock arm 26 Locking claw 27 Receiving plate 28 Locking hole 29 Arm holder 30 Side wall 31 Washer 32 Tension coil spring 33 Vertical plate 34 Overhanging piece 35 Screw Hole 36 Bolt 36a Head 37 Nut 38 Fixed bracket 39 Through hole 40 Movable bracket 41 Through hole 42 Connecting pin 43 Rear plate 44 Opening 45 Arc surface 46 Horizontal part 47 Hanging part 48 Mounting part 49 Hydraulic cylinder 50 Cylinder tube 51 Piston lock Do

Claims (1)

[Claims] 1. A dump truck in which a loading platform is tiltably disposed on an upper portion of a chassis frame, a gate is provided on the loading platform so as to be openable and closable, and upper and lower ends of the gate are detachably connected to an upper portion of the loading platform via a hinge. In a gate support device for a car bed, a locking body is provided at a lower portion of the cargo bed, and the locking body is formed with notches that open upward and outward of the cargo bed.
First and second supports, which are parallel to each other, are provided in the lower portion of the gate so as to face both sides of the lock, and the lock is horizontally provided between the first and second supports. A lock pin that engages with a cutout portion of the body is provided, a plate-shaped gate holding body is provided on a side portion of the second support body, and a notch concave portion that opens toward the inside of the cargo bed is provided in the gate holding body. An engaging portion formed on a side of the locking body and protruding outward of the luggage carrier, and engaging and disengaging with the notch recess of the gate holding body on the supporting shaft in a direction coaxial with the lock pin. A support device for a gate of a dump truck.