JPH11123976A - Rear bumper device in vehicle with load deck elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear bumper device at a vehicle with a load deck elevating device formed at a body rear part, to prevent an adverse effect on the load deck elevating device by a collision, and to prevent the rear bumper device retreated to the ground side so as not to interfere the operation of the load deck elevating device, from being deformed or damaged by interference with ground. SOLUTION: This rear bumper device 6 is provided with a rear bumper 23 at a rotatable holding arm 22. The rear bumper 23 is suspended with a chain 32 from a link mechanism 14 for elevating a load deck 15, and is allowed to turn between a protruding position and a retreating position through the folding arm 22 together with turning of the link mechanism 14, allowing the rear bumper 23 at the protruding position to abut to a receiving member 35 mounted on a body 2 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear bumper device used for a vehicle provided with a receiving stand elevating device at the rear.

[0002]

2. Description of the Related Art A conventional bumper device is disclosed in Japanese Patent Publication No. Hei 5-3318.
As disclosed in Japanese Patent Publication No. 3 (1993), an arm member for raising and lowering an elevating plate by a hydraulic cylinder and a mounting bracket for rotating a bumper extending in the vehicle width direction are connected by a link member. When it is rotated, the mounting bracket is rotated in conjunction therewith to prevent interference between the lifting plate and the bumper.

[0003]

In the above structure, when a passenger car or the like collides with a bumper from behind during traveling, the impact force is reduced by a support pin for supporting the mounting bracket and a member for supporting the tip of the link member. However, there is a problem that these support pins and the like are not only easily bent because of their low strength, but also the arm members and the hydraulic cylinders are deformed via the link members so that the loading tray lifting device does not operate.

When a heavy object is placed on the elevating plate at the lowest position, the rear of the vehicle body is pushed down by the load of the heavy object and the bumper hits the ground. Since the bumper is held, the bumper cannot be rotated to reduce the impact due to interference with the ground, and there is a problem that the bumper is deformed and damaged. Therefore, the present invention prevents the rear bumper retracted to the ground side from being interfered with the ground and being deformed and damaged by preventing the rear bumper retracted to the ground side so as not to hinder the operation of the load receiving platform elevating device in the event of a collision. And a rear bumper device.

[0005]

According to the present invention, a link mechanism is provided at a rear portion of a vehicle body so as to be vertically rotatable, a load receiving table is provided at a front portion of the link mechanism, and the link mechanism is rotated by appropriate driving means. In the vehicle with the loading / unloading device that lifts and lowers the loading tray in a substantially horizontal state, a bending arm that can be bent is rotatably provided on the rear side of the vehicle body,
A rear bumper is provided at the tip of the bending arm, and between the rear bumper or the bending arm and the link mechanism, a projecting position where the rear bumper protrudes toward or abuts the rear part on the vehicle body side at the highest position of the link mechanism. And a connecting means capable of rotating between a retracted position that does not hinder the downward rotation of the link mechanism below the vehicle body.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a vehicle for transporting luggage. The vehicle 1 has a cargo box 4 having a carrier 3 on a vehicle body 2. At the rear of the vehicle 1, there are provided a loading / unloading device 5 for loading / unloading cargo, and a rear bumper device 6 for preventing entry when a collision from behind occurs.

A description will be given of the loading tray elevating device 5. A pair of left and right mounting frames 9 are provided at the rear of the vehicle body 2 via a front support bracket 7 and a rear support bracket 8, and the rear ends of the left and right mounting frames 9 are provided. The parts are connected by a connection frame 10. As shown in FIG. 4, the center of the connecting frame 10 supports a base of an elevating cylinder 11 serving as a driving means, and a tip of the elevating cylinder 11 is rotatably supported between the mounting frames 9. Shaft 1
2 is pivotally supported at the center through a swing arm 13, and the connecting shaft 12 is rotated by the expansion and contraction operation of the lifting cylinder 11.

A link mechanism 14 is provided at both ends of the connecting shaft 12 so as to be vertically rotatable, and a loading table 15 is provided at a leading end of the link mechanism 14. The receiving table 15 moves up and down. The link mechanism 14 forms a parallelogram by a tension link 16 located above, a compression link 17 located below, and an elevating frame 18 connecting the ends of both links.

The base end of the tension link 16 is pivotally supported by the mounting frame 9, and the load support 15 is pivotally supported at the distal end. The compression link 17 has a two-stage refraction structure including a first link 19 inserted into the connection shaft 12 and a second link 20 pivotally supported by the first link 19. First link 19
And restricts downward bending by contacting the link stopper 21 fixed thereto. As a result, the parallelogram is held when the loading tray 15 is moved up and down, and the loading tray 15 is placed in a substantially horizontal state. When the loading tray 15 is grounded, the compression link 17 is bent and the parallelogram collapses, as shown in FIG. It is inclined.

Next, the rear bumper device 6 will be described. A refracting arm 22 is provided rotatably on the left and right mounting frames 9, and a rear bumper 23 extending in the width direction of the vehicle body 2 is provided at the tip of the refracting arm 22. The lower front part is fixed, and the rear bumper 23 is
It is configured to rotate between a projecting position that projects rearward of the mounting frame 9 and a retracted position that retracts below the mounting frame 9.

The refracting arm 22 is provided with a base of a first arm 24 having a rectangular cross section on a lower inner surface of the mounting frame 9.
A downwardly U-shaped second arm 26 is rotatably supported at the tip of the first arm 24, and is integrally formed on the upper surface of the base of the second arm 26 as shown in FIG. By the surface 28 abutting on the first arm 24, the upward rotation of the second arm 26 with respect to the first arm 24 is restricted.

A locking surface 29 is provided at the base of the first arm 24.
Is formed, and the locking surface 29 abuts on a lower stopper 30 provided on the mounting frame 9 so that the first arm 2
4 is prevented from rotating further downward. An upper stopper 31 is fixed to a base portion of the second arm 26 (ahead of the shaft support portion). When the rear bumper 23 is rotated to a projecting position, the stopper comes into contact with the mounting frame 9. .

A chain 32 serving as a connecting means is provided between the rear bumper 23 and the link mechanism 14, and the rear bumper 23 is rotated in conjunction with the rotation of the link mechanism 14. One end of the chain 32 is a rear bumper 23
The other end is supported by a connection bracket 34 provided at an intermediate portion of the outer surface of the tension link 16.

The connecting frame 10 is provided with a pair of left and right receiving members 35 having a rectangular cross section. The front surface of the rear bumper 23 comes into contact with the rear surface of the receiving member 35 at the projecting position of the rear bumper 23, so that the rear bumper 23 can be used in a collision. An impact can be received on the vehicle body 2 side. still,
In this embodiment, one end of the chain is supported by the rear bumper, and the other end is supported by the tension link. However, one end may be supported by the bending arm, or the other end may be supported by the compression arm.

In this embodiment, the lifting device for the receiving tray and the rear bumper are connected by a chain, but they may be connected by an arm or a rope. Further, in the present embodiment, the rear bumper at the projecting position is brought into contact with the receiving member. However, it is sufficient that the rear bumper is at least brought close to the receiving member so that the impact at the time of collision can be received on the vehicle body side.

The operation of the present invention having the above-described structure will now be described. When the vehicle 1 travels, as shown by the dashed line in FIG. 1, the loading table 15 is stored upright behind the packing box 4, and the rear bumper 23 travels while being held at the protruding position. When a passenger car or the like collides from behind during traveling, the passenger car or the like hits the vehicle body 2 or tries to enter under the vehicle body 2, but before that, the rear bumper 2 where the passenger car or the like is in the protruding position
(3) to prevent a passenger car or the like from entering.

At this time, since the impact from the rear bumper 23 acts on the front surfaces of the left and right receiving members 35 and does not act on the link mechanism 14 or the lifting / lowering cylinder 11, damage to the loading tray elevating device 5 due to a collision is reliably prevented. can do. Next, when unloading the cargo on the loading platform 3 to the ground, the loading platform 15 is rotated downward from the standing storage position (the dashed line in FIG. 1) to the overhanging extension position (the solid line in FIG. 1), and then the lifting cylinder 11 is moved. The link mechanism 14 is driven to rotate
Is rotated downward to lower the load receiving table 15.

Then, the rear bumper 23 suspended by the chain 32 starts rotating downward about the shaft fulcrum 25 of the first arm 24 by its own weight with the downward rotation of the tension link 16. At this time, the second arm 26 attempts to rotate upward around the pivot point 27 by the pulling force of the chain 32, but since the regulating surface 28 is in contact with the first arm 24, the upward rotation is restricted. It rotates downward together with the first arm 24.

The lower surface of the first arm 24 causes the locking surface 2 to rotate.
When the abutment 9 contacts the lower stopper 30 as shown in FIG. 7, the downward rotation of the first arm 24 is restricted, and the rear bumper 23 rotates downward about the shaft fulcrum 27 of the second arm 26. It hangs down under its own weight. Thereafter, the tension link 16 further rotates downward, but the chain 32 is loosened and the tensile force of the rear bumper 23 is released, so that the rear bumper 23 is held at the retracted position.

The lifting frame 18 for lowering the receiving table 15 further
Is grounded, and the link mechanism 14 by the link stopper 21 is
Is released, and the receiving tray 15 is inclined as shown in FIG. 2, so that the load on the receiving tray 15 can be lowered to the ground. Next, when loading the luggage on the ground into the packing box 4,
The luggage is placed on the receiving table 15 in the state of FIG. At this time, a downward load acts on the load receiving table 15 due to the weight of the load, but the load is supported on the ground via the lifting frame 18.
Thereafter, the lift cylinder 11 is driven to rotate the link mechanism 14 upward, and the load receiving table 15 is raised.

Then, when the lifting frame 18 moves away from the ground, the load of the load acts on the vehicle body 2. For this reason, the vehicle body 2 is pushed downward, and the rear bumper 23 at the retracted position as shown in FIG. 9 hits the ground, but the upward pushing force acting on the rear bumper 23 is applied to the front end of the first arm 24 via the second arm 26. As the first arm 24 rotates upward, the impact force can be reduced, and deformation and damage of the rear bumper 23 can be prevented.

When the loading tray 15 is further raised, the chain 3 loosened with the upward rotation of the tension link 16.
Tension is given to the rear bumper 23 by its tensile force.
Rotates upward about a pivot point 27 of the second arm 26. By the upward rotation of the second arm 26, the regulating surface 28
As described above, the first arm 24 starts to rotate upward together with the second arm 26 about the pivot 25.

When the loading platform 15 is raised to the loading platform 3, FIG.
As described above, the upper stopper 31 contacts the mounting frame 9 and the front surface of the rear bumper 23 contacts or approaches the receiving member 35, and the rear bumper 23 is held at the projecting position by the pulling force of the chain 32. After the loading tray 15 is moved up, the cargo on the loading tray 15 is loaded on the loading platform 3.

[0024]

As described above, according to the present invention, the rear bumper is provided on the rotatable bending arm, and the rear bumper is rotated between the projecting position and the retracted position together with the link mechanism by the connecting means. In addition to preventing the operation of the loading / unloading device, the rear bumper at the evacuation position can be rotated upward via the refraction arm even if it interferes with the ground, reducing the impact force due to interference with the ground. Therefore, deformation and damage of the rear bumper can be prevented.

Further, since the rear bumper at the projecting position is brought into contact with the receiving member provided on the vehicle body side, the impact force to the rear bumper can be received on the vehicle body side, and the impact on the loading / unloading device in the event of a collision is adversely affected. Can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is an overall view of a rear portion of a vehicle, showing a loading tray elevating device and a rear bumper device of the present invention.

FIG. 2 is an overall view of a rear portion of the vehicle at the time of lowering of a loading tray.

FIG. 3 is an AA diagram of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along the line CC of FIG. 3;

FIG. 6 is a sectional view taken along line DD of FIG. 5;

FIG. 7 is an overall view of a rear portion of the vehicle during ascending and descending of the loading tray.

FIG. 8 is a side view of the rear bumper device in a retracted position.

FIG. 9 is an operation state diagram of the rear bumper device.

[Explanation of symbols]

 2 Body 6 Rear bumper device 5 Receiving stand elevating device 11 Lifting cylinder (driving means) 14 Link mechanism 15 Receiving stand 22 Refracting arm 23 Rear bumper 32 Chain (Connecting means)

Claims (1)

[Claims] 1. A link mechanism is provided at the rear part of a vehicle body so as to be vertically rotatable, a load receiving table is provided at a front end of the link mechanism, and the link mechanism is rotated by a suitable driving means so as to make the load receiving table substantially horizontal. In a vehicle with a loading tray elevating device adapted to be raised and lowered in a state, a refractible refracting arm is rotatably provided on the rear side of the vehicle body, and a rear bumper is provided at a front end of the refracting arm, and the rear bumper or Between the bending arm and the link mechanism, a protruding position where the rear bumper protrudes by bringing the rear bumper close to or in contact with the rear portion of the vehicle body at the highest position of the link mechanism and does not hinder the downward rotation of the link mechanism below the vehicle body. A rear bumper device for a vehicle with a loading / unloading device that includes a connecting means capable of rotating between a retracted position and a receiving position.