JP7544620B2 - Bumper device and loading vehicle - Google Patents

Description

The present invention relates to a bumper device that is equipped on a vehicle, and in particular to a bumper device that is mounted on a cargo handling vehicle, such as a vehicle transporter, a container transporter, a dump truck, etc., that has a function of moving a part of the cargo bed or lowering a part of the cargo bed to the ground.
The present invention also relates to a loading vehicle.

There are known cargo handling vehicles that have the function of changing the position of the cargo bed and lowering the cargo bed to the ground. For example, Patent Document 1 discloses a body loading and unloading vehicle. The body loading and unloading vehicle disclosed in Patent Document 1 is a vehicle transporter that is used when transporting vehicles such as passenger cars and civil engineering machines. The vehicle transporter described in Patent Document 1 is equipped with a lift frame and a slidable body. And in the vehicle disclosed in Patent Document 1, the lift frame can be tilted and the body (cargo bed) can be slid to lower the body to the ground.

In addition, freight vehicles are required to be equipped with rear bumpers, which must protrude rearward from the vehicle body to a certain extent to ensure safety in the event of a collision with pedestrians or other vehicles.
However, the above-mentioned vehicle transporters and the like have a function in which the loading platform can be tilted backwards or the loading platform can be lowered to the ground from the rear, and since the rear bumper is attached in a protruding state toward the rear of the vehicle, the rear bumper gets in the way when tilting the loading platform, etc.
Therefore, a structure has been proposed in which the rear bumper can be retracted when performing operations such as loading and unloading (Patent Document 2).

The bumper device 200 disclosed in Patent Document 2 has a bumper body 202 attached to the tip of a link mechanism 201, as shown in FIG. 9. A hydraulic cylinder 203 is provided to extend and retract the entire length of the link mechanism 201.

JP 2000-108768 A Patent No. 4633917

In the bumper device 200 disclosed in Patent Document 2, a hydraulic cylinder 203 is disposed along the extension/contraction direction of a bumper body 202. That is, the hydraulic cylinder 203 is disposed along the front-rear direction of the vehicle.
For this reason, the bumper device 200 disclosed in Patent Document 2 has a long overall length, and there are limitations to the vehicles to which it can be attached. For example, if the length from the rear wheels to the rear end of the vehicle body is short, the differential of the vehicle may get in the way and make it impossible to attach the bumper device 200.

The present invention solves the above-mentioned problems of the conventional technology and provides a bumper device that has a short overall length when contracted.

The aspect for solving the above-mentioned problem is a bumper device that is attached to a vehicle, and includes a bumper body and a bumper movement mechanism that moves the bumper body, the bumper movement mechanism has two front arms, two rear arms, a connecting link, and a cylinder, the front portions of the two front arms are pivotally engaged with a member belonging to the vehicle relative to the vehicle, one end of the two rear arms is pivotally engaged with the front arm, and the other end is pivotally engaged with a member belonging to the bumper body, the connecting link is pivotally engaged with the two front arms or the two rear arms, the engagement position of the connecting link with the two front arms or the two rear arms is a position that is out of engagement with the member belonging to the vehicle or the member belonging to the bumper body, the connecting link moves linearly by the cylinder, the relative angle between the two front arms or the two rear arms changes, and the bumper body moves in the fore-and-aft direction of the vehicle.

According to the bumper device of this aspect, the cylinder can be installed facing in the width direction of the vehicle.
Therefore, the bumper device of this embodiment has a short overall length when contracted.

In the above-mentioned aspect, it is desirable that the two front arms swing in different directions relative to the central axis between the two front arms as the connecting link moves linearly, and that the two rear arms swing in different directions relative to the central axis.

In each of the above aspects, it is desirable for the cylinder to be installed along the width direction of the vehicle.

In each of the above-mentioned aspects, it is preferable that the rotation center of one front arm relative to the member belonging to the vehicle is A, the rotation center of the one front arm relative to the rear arm is B, the rotation center of the one front arm relative to the front connecting link is C, and the rotation center C is offset to the outside or inside of the rotation center A, the rotation center of the other front arm relative to the member belonging to the vehicle is a, the rotation center of the other front arm relative to the rear arm is b, and the rotation center of the other front arm relative to the connecting link is c, and the rotation center c is offset from the rotation center a in the opposite direction to the rotation center C.

In each of the above-mentioned aspects, it is preferable that the rotation center of one rear arm relative to the member belonging to the bumper body is D, the rotation center of the one rear arm relative to the front arm is B, the rotation center of the one rear arm relative to the connecting link is E, the rotation center E is offset to the outside or inside of the rotation center D, the rotation center of the other rear arm relative to the member belonging to the bumper body is d, the rotation center of the other rear arm relative to the front arm is b, the rotation center of the other rear arm relative to the connecting link is e, and the rotation center e is offset in the opposite direction from the rotation center E with respect to the rotation center d.

In each of the above-mentioned aspects, it is desirable to have a front-side connecting link that rotatably engages with the two front arms and connects the two front arms together, and a rear-side connecting link that rotatably engages with the two rear arms and connects the two rear arms together, and the front-side connecting link moves linearly by the cylinder.

In each of the above-mentioned aspects, it is desirable that one of the front arms or one of the rear arms swings around a pivot point, and that the connecting link, at least in a specific posture, engages with one of the front arms or one of the rear arms at a position forward of the pivot point relative to the vehicle, and engages with the other of the front arms or the other of the rear arms at a position rearward of the pivot point relative to the vehicle.

The cargo handling vehicle is characterized in that it is equipped with a platform section that is movable relative to the vehicle body and is equipped with any of the bumper devices described above.

The bumper device of the present invention has a short overall length when contracted, and there are few installation restrictions.

1 is a plan view of a bumper device according to an embodiment of the present invention, showing a state in which the entire device is extended and the bumper body is in a driving position. 2 is a plan view in which the members of the bumper device in FIG. 1 are modeled and divided into individual members. FIG. 1 is a plan view of a bumper device according to an embodiment of the present invention, showing a state in which the entire device is contracted and the bumper body is in a stored position. 2 is a structural diagram of the bumper device of FIG. 1 , showing a state in which the entire device is extended and the bumper body is in a driving position. 2 is a structural diagram of the bumper device of FIG. 1 , showing a state in which the entire device is contracted and the bumper body is in a storage position. 1 is a side view and a partially enlarged view of a loading vehicle according to an embodiment of the present invention. 7A, 7B, and 7C are side views showing the operation of each part during unloading operation of the loading vehicle shown in FIG. 6. 7(d), (e), and (f) are side views showing the operation of each part in the unloading operation of the loading vehicle shown in FIG. 6, which is continued from FIG. FIG. 1 is a plan view of a prior art bumper device.

Further embodiments of the present invention will be described below.
The bumper device 50 of this embodiment is used as a bumper for a cargo handling vehicle 1 as shown in FIG.
In the following description, the relationship between the front and rear is based on the front and rear of the loading vehicle 1. In other words, the front side means the driver's seat 100 side, and the rear side means the opposite side.

The bumper device 50 is composed of a bumper body 10 and a bumper movement mechanism 51 that moves the bumper body 10. The bumper device 50 is capable of changing the position of the bumper body 10 by the bumper movement mechanism 51 between a driving position suitable for driving and a storage position retracted to the vehicle section 5 side.
The bumper body 10 is a bar-shaped or plate-shaped member having a length corresponding to the overall width of the vehicle, and has a connection portion 52 .

The bumper moving mechanism 51 is composed of a link mechanism part 40 and a hydraulic cylinder 41 .
The link mechanism 40 has two front arms 60 , 61 , two rear arms 65 , 66 , a front connecting link 67 , and a rear connecting link 68 .

The front arms 60, 61, the rear arms 65, 66 and the connecting links 67, 68 all have a three-dimensional cross-sectional shape and have considerable rigidity.
The front arms 60, 61 and the rear arms 65, 66 have approximately the same overall length.
The front connecting link 67 and the rear connecting link 68 have substantially the same overall length.

As shown in Figure 2, the front arm 60 has a vehicle side engagement hole 70 that is rotatably supported on the vehicle portion 5, a rear arm side engagement hole 71 that rotatably engages with the rear arm 65, and a connecting link side engagement hole 72 that rotatably engages with the front side connecting link 67.
The connecting link side engagement hole 72 is located away from the straight line 101 that connects the vehicle side engagement hole 70 and the rear arm side engagement hole 71. The connecting link side engagement hole 72 is also located outboard of the vehicle side engagement hole 70. When assembled into the link mechanism 40, the connecting link side engagement hole 72 is in a position that protrudes outward from the frame surrounded by the links.

The front arm 61 has a vehicle side engagement hole 80 that is rotatably supported on the vehicle portion 5, a rear arm side engagement hole 81 that rotatably engages with the rear arm 66, and a connecting link side engagement hole 82 that rotatably engages with the front side connecting link 67.
The connecting link side engagement hole 82 is located off of the straight line 102 connecting the vehicle side engagement hole 80 and the rear arm side engagement hole 81. The connecting link side engagement hole 82 is also located more inward than the vehicle side engagement hole 80. In other words, when assembled into the link mechanism 40, the connecting link side engagement hole 82 is located in a position that protrudes toward the inside of the frame surrounded by the links. When assembled into the link mechanism 40, the connecting link side engagement hole 72 of the front arm 60 and the connecting link side engagement hole 82 of the front arm 61 are located in positions that protrude in the same direction (upward in the drawing).
1 and 2, in the state where the link mechanism 40 is assembled, the connecting link side engagement hole 72 of the front arm 60 is located forward of the line connecting the vehicle engagement holes 70 and 80. On the other hand, the connecting link side engagement hole 82 of the front arm 61 is located rearward of the line connecting the vehicle engagement holes 70 and 80 (on the front-to-rear opposite side of the connecting link side engagement hole 72).

The mechanical lengths of the front arms 60, 61 are approximately equal. That is, the distance between the vehicle side engagement hole 70 and the rear arm side engagement hole 71 of the front arm 60 and the distance between the vehicle side engagement hole 80 and the rear arm side engagement hole 81 of the front arm 61 are approximately equal.
In addition, the distance between the vehicle side engagement hole 70 and the connecting link side engagement hole 72 of the front arm 60 is approximately equal to the distance between the vehicle side engagement hole 80 and the connecting link side engagement hole 82 of the front arm 61. Furthermore, the acute angle side of the angle formed by the straight line 101 of the front arm 60, the vehicle side engagement hole 70, and the connecting link side engagement hole 72 (hereinafter referred to as the protruding angle) is approximately equal to the protruding angle of the connecting link side engagement hole 82 of the front arm 61.

The rear arm 65 has a front arm side engagement hole 73 that rotatably engages with the front arm 60, a bumper side engagement hole 75 that is rotatably supported on the bumper main body side, and a connecting link side engagement hole 76 that rotatably engages with the rear side connecting link 68.
The connecting link side engagement hole 76 is located away from the straight line 103 that connects the bumper side engagement hole 75 and the front arm side engagement hole 73. The connecting link side engagement hole 76 is also located more inward than the bumper side engagement hole 75. When assembled into the link mechanism 40, the connecting link side engagement hole 76 is located in a position that protrudes toward the inside of the frame surrounded by the links.

The rear arm 66 has a front arm side engagement hole 83 that rotatably engages with the front arm 61, a bumper side engagement hole 85 that is rotatably supported on the bumper main body side, and a connecting link side engagement hole 86 that rotatably engages with the rear side connecting link 68.
The connecting link side engagement hole 86 is located off of the straight line 105 connecting the bumper side engagement hole 85 and the front arm side engagement hole 83. The connecting link side engagement hole 86 is also located outboard of the bumper side engagement hole 85. That is, when assembled into the link mechanism 40, the connecting link side engagement hole 86 is in a position that protrudes outward from the frame surrounded by the links. When assembled into the link mechanism 40, the connecting link side engagement hole 76 of the rear arm 65 and the connecting link side engagement hole 86 of the rear arm 65 are in positions that protrude in the same direction (downward in the drawing).

The mechanical lengths of the rear arms 65, 66 are approximately equal. That is, the distance between the bumper side engagement hole 75 and the front arm side engagement hole 73 of the rear arm 65 is approximately equal to the distance between the bumper side engagement hole 85 and the front arm side engagement hole 83 of the rear arm 66.
Further, the distance between the bumper side engagement hole 75 and the connecting link side engagement hole 76 of the rear arm 65 and the distance between the bumper side engagement hole 85 and the connecting link side engagement hole 86 of the rear arm 66 are approximately equal.
The protruding angle of the connecting link side engagement hole 76 of the rear arm 65 and the protruding angle of the connecting link side engagement hole 86 of the rear arm 66 are also substantially equal.

Furthermore, in this embodiment, the mechanical length of the rear arms 65, 66 and the mechanical length of the front arms 60, 61 are approximately equal. The protruding angles are also approximately equal.

The front connecting link 67 has an engagement hole 88 on one side that is rotatably engaged with one of the front arms 60 , and an engagement hole 90 on the other side that is rotatably engaged with the other front arm 61 .
Further, a cylinder attachment portion 93 that protrudes outward is provided on a straight portion of the front connecting link 67. The cylinder attachment portion 93 is provided with a cylinder attachment hole 95.

The rear connecting link 68 has a one-side engagement hole 91 that rotatably engages with one of the rear arms 65 , and an other-side engagement hole 92 that rotatably engages with the other rear arm 66 .
The mechanical lengths of the rear connecting link 68 and the front connecting link 67 are approximately equal. In other words, the distance between the engagement hole 88 on one side of the front connecting link 67 and the engagement hole 90 on the other side is approximately equal to the distance between the engagement hole 91 on one side of the rear connecting link 68 and the engagement hole 92 on the other side.

The link mechanism 40 includes the two front arms 60, 61, the two rear arms 65, 66, a front connecting link 67, and a rear connecting link 68, which are connected in an annular shape via pins.
That is, the front arm 60, the rear arm 65, the rear connecting link 68, the rear arm 66, the front arm 61, the front connecting link 67, and the front arm 60 are rotatably connected in this order by pins 110, 111, 112, 113, 115, and 116.

Specifically, the rear arm side engagement hole 71 provided at one end of the front arm 60 and the front arm side engagement hole 73 provided at one end of the rear arm 65 are aligned and a pin 110 is inserted through them, so that the front arm 60 and the rear arm 65 are engaged to be rotatable around the rotation center B.

The connecting link side engagement hole 76 on the rear arm 65 and the engagement hole 91 on the rear connecting link 68 are aligned and a pin 111 is inserted through them, so that the rear arm 65 and the rear connecting link 68 are engaged to be rotatable around the pivot center E.

The engagement hole 92 on the rear connecting link 68 and the connecting link side engagement hole 86 on the rear arm 66 are aligned and a pin 112 is inserted through them, so that the rear connecting link 68 and the rear arm 66 are engaged to be rotatable around the pivot center e.

The front arm side engagement hole 83 on the rear arm 66 and the rear arm side engagement hole 81 on the front arm 61 are aligned and a pin 113 is inserted through them, so that the rear arms 66 and 66 are engaged to be rotatable around the rotation center b.

The connecting link side engagement hole 82 on the front arm 61 and the engagement hole 90 on the front side connecting link 67 are overlapped and a pin 115 is inserted through them, so that the front arm 61 and the front side connecting link 67 are engaged to be rotatable around the rotation center c.

The engagement hole 88 on the front connecting link 67 and the connecting link side engagement hole 72 on the front arm 60 are overlapped and a pin 116 is inserted through them, so that the front connecting link 67 and the front arm 60 are engaged to be rotatable around the rotation center C.

Furthermore, a pin 117 is inserted through the vehicle side engagement hole 70 of the front arm 60, and the front arm 60 is rotatably supported on a part of the vehicle section 5. The front arm 60 is fixed to a part of the vehicle section 5 so as to be rotatable around a rotation center A. Similarly, a pin 118 is inserted through the vehicle side engagement hole 80 of the front arm 61, and the front arm 61 is fixed to a part of the vehicle section 5 so as to be rotatable around a rotation center a.

The rod of the hydraulic cylinder 41 is rotatably connected to a cylinder mounting hole 95 of a cylinder mounting portion 93 provided on the front connecting link 67 .
An end portion of the hydraulic cylinder 41 is rotatably supported by a member belonging to the vehicle portion 5 .

In summary, one of the front arms 60 is fixed to a member belonging to the vehicle section 5 and rotates around a rotation center A, the front arm 60 and the rear arm 65 are engaged to be rotatable around a rotation center B, and the front arm 60 is engaged to be rotatable around a rotation center C with the front connecting link 67. In addition, the rotation center C between the front arm 60 and the front connecting link 67 is located outside the rotation center A.

The other front arm 61 is fixed to a member belonging to the vehicle section 5 and rotates about a rotation center a, the front arm 61 and a rear arm 66 are engaged to be rotatable about a rotation center b, and the front arm 61 is engaged to be rotatable about a rotation center c with a front connecting link 67. The rotation center c between the front arm 61 and the front connecting link 67 is offset inward from the rotation center a.
That is, the center of rotation c is offset from the center of rotation C in the opposite direction.

One of the rear arms 65 is fixed to a member belonging to the bumper body 10 and is engaged to be rotatable around a rotation center D, and the rear arm 65 is engaged to be rotatable around a rotation center B with the front arm 60, and the rotation center E of the rear arm 65 relative to the rear side connecting link 68 is located inward from the rotation center D.
The other rear arm 66 is fixed to a member belonging to the bumper body 10 and is rotatably engaged about a pivot center d, the rear arm 66 is rotatably engaged with the front arm 61 about a pivot center b, and the pivot center e of the rear arm 66 relative to the rear connecting link 68 is positioned outward from the pivot center d.
That is, the rotation center e is offset from the rotation center D in the opposite direction.

Next, the relationship between the bumper device 50 and the vehicle portion 5 will be described.
The bumper device 50 is attached to the lower part of the bed frame 2 at the rear end side of the vehicle.
As described above, the bumper device 50 is rotatably and directly fixed to a part of the vehicle section 5 via the vehicle-side engagement holes 70, 80 provided on the front sides of the two front arms 60, 61.
Therefore, the front arms 60 , 61 of the bumper device 50 are rotatable via the vehicle-side engagement holes 70 , 80 provided on the front side, but do not move relative to the vehicle portion 5 .
In contrast, the other members are indirectly supported by the vehicle section 5 and have a degree of freedom, allowing them to change position and move.
The end portion of the hydraulic cylinder 41 is rotatably supported by a member belonging to the vehicle portion 5 .
Therefore, the hydraulic cylinder 41 can change its attitude but cannot change its position.
The hydraulic cylinder 41 is oriented approximately parallel to the bumper body 10 and is disposed in the width direction of the vehicle portion 5. Therefore, the length of the hydraulic cylinder 41 does not affect the length of the bumper device 50 in the front-rear direction.
Therefore, the bumper device 50 of this embodiment has a relatively short length in the front-rear direction.

As shown in FIG. 3, the hydraulic cylinder 41 is positioned so that it fits between the vehicle section 5 (particularly the vehicle engagement holes 70 and 80) even when extended. Therefore, the length of the hydraulic cylinder 41 does not affect the left-right (vehicle width) length of the bumper device 50.

When the bumper device 50 is in an extended state, it appears as shown in Figure 1, and the annular structural portion formed by the front arm 60, rear arm 65, rear connecting link 68, rear arm 66, front arm 61, front connecting link 67, and front arm 60 is approximately square-shaped.
That is, the front arm 60 and the rear arm 65 are in a substantially straight line, and the other front arm 61 and the rear arm 66 are also in a substantially straight line, with both straight line portions being parallel with a gap between them.
Further, the rear connecting link 68 and the front connecting link 67 are parallel to each other with a gap therebetween.
Therefore, the bumper moving mechanism 51 has a long overall length. Here, the vehicle side engagement holes 70, 80 of the front arms 60, 61 are fixed to the vehicle portion 5 and cannot move, so the bumper body 10 has moved rearward.

When the bumper device 50 is in an extended state, one front arm 60 swings around a pivot center A serving as a pivot point, and the front connecting link 67 engages with the front arm 60 at a position forward of the pivot center A, while the other front arm 61 swings around a pivot center a serving as a pivot point, and the front connecting link 67 engages with the front arm 61 at a position rearward of the pivot center a.

When the bumper device 50 is in an extended state, one rear arm 65 swings around a pivot center D serving as a pivot point, and the rear connecting link 68 engages with the rear arm 65 at a position forward of the pivot center D, while the other rear arm 66 swings around a pivot center d serving as a pivot point, and the rear connecting link 68 engages with the rear arm 66 at a position rearward of the pivot center d.

The appearance of the bumper device 50 when it is in a contracted state is as shown in Figure 3, and the annular structural portion consisting of the front arm 60, rear arm 65, rear connecting link 68, rear arm 66, front arm 61, front connecting link 67, and front arm 60 is in a folded state.
That is, the front arm 60 and the rear arm 65 are bent at the rotation center B, and the front arm 60 and the rear arm 65 are placed in a substantially parallel position. The other front arm 61 and the rear arm 66 are also placed in a substantially parallel position.
Further, the rear connecting link 68 and the front connecting link 67 are parallel to each other with a gap therebetween.
Therefore, the overall length of the bumper moving mechanism 51 is short. Here, the vehicle side engagement holes 70, 80 of the front arms 60, 61 are fixed to the vehicle portion 5 and cannot move, so the bumper body 10 moves forward.

Next, the movement of the bumper device 50 will be described with reference to FIGS.
As shown in FIG. 4, when the bumper moving mechanism 51 is in an extended state, the hydraulic cylinder 41 is in a contracted state.
From this state, when the rod of the hydraulic cylinder 41 is extended, the front connecting link 67 that engages with the rod moves linearly in the direction of the arrow in the drawing, that is, with a movement component in the axial direction.

The front connecting link 67 is connected to one of the front arms 60 at a rotation center C. Meanwhile, the front arm 60 itself rotates about a rotation center A. Here, the rotation center C, which is the point of force, is offset to the outside (front) of the rotation center A, which is the rotation fulcrum.
Therefore, when the front connecting link 67 moves linearly in the direction of the arrow in the drawing, the front arm 60 rotates counterclockwise as indicated by the arrow in the drawing about the rotation center A serving as the rotation fulcrum.

Meanwhile, the front connecting link 67 is connected to the other front arm 61 at a rotation center c. Meanwhile, the front arm 61 itself rotates about a rotation center a. Here, the rotation center c, which is the point of force, is offset inward (rearward) from the rotation center a, which is the rotation fulcrum.
Therefore, when the front connecting link 67 moves linearly in the direction of the arrow in the drawing, the front arm 61 rotates clockwise as indicated by the arrow in the drawing about the rotation center a serving as the rotation fulcrum.
That is, the front arms 60 and 61 swing in different directions, and the angle between them increases.

The distance between the rotation centers B, b, which are the connection points between the rear arms 65, 66 and the front arms 60, 61, increases as the front arms 60, 61 swing in the direction opening from each other. However, since the distance between the rotation centers E, e, which are the connection points with the bumper body 10, is constant, the angle between the rear arms 65, 66 also increases as the front arms 60, 61 swing in the opening direction, and the rear arms 65, 66 and the front arms 60, 61 change position in the direction of overlapping.
As a result, the bumper body 10 moves forward. In addition, since the mechanical lengths and protruding angles of the front arms 60, 61 and the rear arms 65, 66 are substantially equal, the bumper body 10 moves in parallel.

The bumper device 50 is attached to a cargo vehicle 1, for example, as shown in FIG. 6.

The bumper device 50 is capable of changing the position of the bumper body 10 by the bumper movement mechanism 51 between a driving position suitable for driving and a storage position retracted to the vehicle portion 5 side.
In this embodiment, the position where the hydraulic cylinder 41 is retracted and the bumper body 10 is extended rearward is the driving position, and the position where the hydraulic cylinder 41 is extended and the bumper body 10 is disposed forward is the stored position.
In the loading vehicle 1 of this embodiment, the bumper device 50 is provided with a storage detection means 55 and an extension detection means 56. The storage detection means 55 is a sensor that notifies in advance whether the bumper body 10 is in the storage position. The extension detection means 56 is a sensor that detects whether the bumper body 10 is in the traveling position.
The storage detection means 55 and the extension detection means 56 are known proximity sensors, photoelectric sensors, etc. The storage detection means 55 may be a mechanical switch such as a limit switch.

The loading vehicle 1 of this embodiment is a vehicle transporter, in which a slide body (cargo platform) is lowered onto the vehicle and onto the ground to load an automobile or the like, and in this state the slide body (cargo platform) is pulled up onto the vehicle for transport.
6, the cargo handling vehicle 1 has a vehicle section 5 and a loading device 18. The loading device 18 is roughly composed of a lift frame 30, a tilt mechanism 31, and a slide body (cargo platform section) 32.
The loading device 18 also includes a control device 6, a hydraulic device 7, and a bumper device 50. The loading device 18 also includes a remote control device (hereinafter referred to as a remote control).
The vehicle section 5 is a vehicle body of a known truck, has an engine, and rotates wheels to travel on a road.
The lift frame 30 is mounted on a subframe 33 of the vehicle section 5, and swings about a pin (not shown) provided on the rear end side of the vehicle section 5. That is, the lift frame 30 can assume an inclined position as shown in Figs.
In addition, the lift frame 30 itself moves in the front-rear direction relative to the vehicle portion 5.

The tilt mechanism 31 is composed of a cylinder 35 and a link mechanism 36, and is used to tilt the lift frame 30.

The slide body 32 is slidably attached to the lift frame 30, and is suspended by a chain or the like (not shown) so as to move linearly along the lift frame 30. A footboard 37 is provided at the rear end of the slide body 32.
The footboard 37 is located at the rear end of the slide body 32 and can be changed between an upright position and a flat position.

When the cargo handling vehicle 1 is traveling, the lift frame 30 is in a horizontal position as shown in FIG. 7( a ), and the slide body 32 is lifted up onto the lift frame 30 .
When loading and unloading a vehicle, the bumper body 10 is moved to the storage position as shown in FIG.
Then, the lift frame 30 is moved rearward as shown in FIG.
Next, the cylinder 35 is activated to operate the tilt mechanism 31, thereby tilting the lift frame 30 as shown in FIG.
Next, the slide body 32 is moved toward the rear of the vehicle, and the rear end of the slide body 32 is landed on the ground as shown in FIG. 8(e), and the slide body 32 is slid down.
8(f), the lift frame 30 is raised to the maximum angle, and the slide body 32 is then moved toward the rear of the vehicle and lowered to the ground. The footboard 37 is then brought into a horizontal position, and the vehicle is loaded or unloaded.

In the embodiment described above, the front connecting link 67 is moved linearly by the hydraulic cylinder 41, but the hydraulic cylinder 41 may be provided on the rear connecting link 68 side. In this case, by providing the hydraulic cylinder 41 substantially parallel to the bumper body 10, the hydraulic cylinder 41 can be contained within the front-to-rear length of the link mechanism 40, and the overall length of the bumper device 50 can be shortened.
Moreover, either the front connecting link 67 or the rear connecting link 68 may be omitted.
In the embodiment described above, the bumper body 10 is moved forward by swinging so that the angle between the front arms 60 and 61 becomes wider, but the bumper body 10 also moves forward when the front arms 60 and 61 are swung so that the angle between them becomes narrower.
In the embodiment described above, a vehicle transporter has been shown as an example of a loading vehicle, but the loading vehicles to which the bumper device of the present invention can be applied are not limited to vehicle transporters, and can be widely adopted in vehicles whose loading platform moves or whose posture is changed, such as container transporters and dump trucks.

REFERENCE SIGNS LIST 1 Cargo handling vehicle 5 Vehicle section 10 Bumper body 18 Loading device 30 Lift frame 31 Tilt mechanism 32 Slide body 41 Hydraulic cylinder 50 Bumper device 51 Bumper moving mechanism 60, 61 Front arms 65, 55 Rear arms 67 Front connecting link 68 Rear connecting links A, B, C, D, E Rotation centers a, b, c, d, e Rotation centers

Claims (8)

A bumper device to be attached to a vehicle, the bumper device including a bumper body and a bumper movement mechanism for moving the bumper body,
The bumper moving mechanism includes:
The vehicle pivots about a pivot point.
Two front arms and two rear arms;
Including a force point corresponding to the pivot point,
The connecting link,
A cylinder.
Both of the two front arms are
The front portion of the vehicle is rotatably engaged with a member of the vehicle at a rotation center A on one side and a rotation center a on the other side in a width direction of the vehicle perpendicular to a direction from the front side to the rear side of the vehicle, and
a rear portion of the vehicle is rotatably engaged with one end of the rear arm at a rotation center B on one side and a rotation center b on the other side in a width direction of the vehicle,
Each of the two rear arms is rotatably engaged with a member belonging to the bumper body at a rotation center D on one side and a rotation center d on the other side in the width direction of the vehicle ,
the connecting link is rotatably engaged at one end and the other end in a length direction thereof with each of the two front arms at a rotation center C on one side and a rotation center C on the other side in a width direction of the vehicle , which are also the force points, or at a rotation center E on one side and a rotation center e on the other side in a width direction of the vehicle, which are also the force points, with each of the two rear arms;
The end portion of the cylinder is rotatably supported by a member belonging to the vehicle,
The positions of the rotation centers C and c are positions that are offset from the rotation centers A and a, or the positions of the rotation centers E and e are positions that are offset from the rotation centers D and d ,
The connecting link is moved directly and linearly by the cylinder,
A bumper device characterized in that the relative angle between the two front arms or the relative angle between the two rear arms changes , causing the bumper body to move in the fore-and-aft direction of the vehicle. the two front arms swing in different directions relative to a central axis between the two front arms as the connecting link moves linearly,
2. The bumper device according to claim 1, wherein the two rear arms swing in different directions relative to the central axis. 3. The bumper device according to claim 1 , wherein the direction of linear movement of the connecting link by the cylinder is along a width direction of the vehicle. The rotation center C is offset to the outside or inside of the rotation center A,
4. The bumper device according to claim 1, wherein the rotation center c is offset from the rotation center a in a direction opposite to the rotation center C. The rotation center E is offset to the outside or inside of the rotation center D,
5. The bumper device according to claim 1, wherein the rotation center e is offset from the rotation center d in a direction opposite to the rotation center E. As the connecting link,
a front-side connecting link that is rotatably engaged with the two front arms and connects the two front arms together;
a rear side connecting link that is rotatably engaged with the two rear arms and connects the two rear arms together ;
There are two of them .
6. The bumper device according to claim 1, wherein the front connecting link is moved linearly by the cylinder. The connecting link ,
a relative positional relationship of the force point at the one end to the corresponding pivot point;
Regarding the relative positional relationship of the force point at the other end with respect to the corresponding pivot point,
7. The bumper device according to claim 1, wherein one relative positional relationship is a front side and another relative positional relationship is a rear side with respect to the vehicle . A cargo handling vehicle having a platform section that is movable relative to the vehicle body, characterized in that the cargo handling vehicle is equipped with a bumper device according to any one of claims 1 to 7.

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