JPH11268600A - Vehicular rear bumper having cargo receiving base-elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular rear bumper having a cargo receiving base- elevating device to prevent the occurrence of interference with a rear bumper even when the elevating device is elevated and besides suppress the occurrence of an influence exercised on the elevating device by an impact. SOLUTION: A cargo receiving base 12 is elevatably arranged at a car frame 1 rear end part through a link mechanism and a rear bumper 20 is arranged at the car frame 1 rear end part. In a vehicle having a so formed cargo receiving base elevating device 10, a rear bumper 20 is vertically oscillatorily arranged at the rear end part of the car frame 1 through a rear bumper support member 20a. When the cargo receiving base 12 reaches a topmost position interlocking with elevation operation of the cargo receiving base 12 coupled between the rear bumper support member 20a and a link mechanism, the rear bumper 20 is arranged in a protrusion position protruded to the rear of the car frame 1. Further, during operation in which the cargo receiving base 12 reaches a ground, the rear bumper 20 is arranged in a containing position where it is contained below the rear end part of the car frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear bumper of a vehicle provided with a loading tray raising / lowering device for lifting a loading tray via a link mechanism.

[0002]

2. Description of the Related Art Conventionally, when a rear bumper is provided in a vehicle in which a loading tray elevating device is provided at a rear end portion of a loading tray via a link mechanism so as to be able to move up and down, a vertical link mechanism and a rear bumper are required. In order to avoid interference, the rear bumper is mounted on the vehicle in a state of being divided into a plurality of parts (for example, three parts).

[0003]

However, when the rear bumper is divided as in the prior art, each of the divided members must be separately attached to the vehicle via a stay or the like, thereby increasing the number of parts. As a result, the mounting work becomes complicated and there is a problem in terms of strength.

[0004] As disclosed in Japanese Patent Application Laid-Open No. 1-301423, there is a link mechanism in which a rear bumper is directly connected to a link mechanism via a bracket, but when a rear bumper receives an external impact. However, this impact is directly received by the link mechanism, and there is a problem that the lifting / lowering device itself is damaged and a problem that it is difficult to secure a clearance from the ground when the rear bumper rotates.

[0005]

According to a first aspect of the present invention, there is provided a rear bumper of a vehicle equipped with a loading / unloading device, wherein the loading / unloading platform can be moved up and down via a link mechanism at a rear end of a vehicle frame on which the loading platform is mounted. In a vehicle provided with a loading stand elevating device in which a rear bumper is disposed at the rear end of the vehicle frame, the rear bumper swings vertically to the rear end of the vehicle frame via a rear bumper support member. A movable connecting rod is connected between the rear bumper supporting member and the link mechanism, and the connecting rod is moved up and down by the connecting rod to reach the highest position. The rear bumper is disposed at a protruding position protruding rearward of the vehicle frame, and the rear bumper is disposed at a storage position where the rear bumper is stored below the rear end of the vehicle frame during operation for reaching the ground. Those that are configured to be.

According to a second aspect of the present invention, there is provided a rear bumper of a vehicle provided with the loading / unloading device, wherein the loading / unloading platform is provided at a rear end of a vehicle frame of the vehicle having the loading platform via a link mechanism so as to be able to move up and down. In a vehicle equipped with a loading tray lifting device in which a rear bumper is disposed at a rear end portion of a vehicle frame, the link mechanism is disposed above or below the rotary link that is rotated up and down by a driving unit. Driven link is connected to the rear end of the vehicle frame and the receiving tray, and the upper end of the connecting rod is rotatable near the upper end of the rotating link or driven link disposed below the link mechanism. While being supported, the lower end of this connecting rod is connected to a rear bumper support member that supports the rear bumper, while the rear bumper support member and the rear end of the vehicle frame have:
Both ends of an operating arm composed of two front and rear arms, one end of which is rotatably supported, are rotatably supported, and the front arm is biased upward by a biasing member. During the lowering operation of the load receiving table accompanying the downward rotation of the link mechanism, the downward rotation of the rear arm until the rotation link or the driven link disposed below contacts the rear bumper. Guides the rear bumper downward from a projecting position protruding rearward of the rear end of the vehicle frame, and after the turning link or the driven link abuts the rear bumper, the front arm receives the urging force of the urging member. The rear bumper rotates downward to guide the rear bumper to a storage position stored below the rear end of the vehicle frame.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a rear bumper of a vehicle equipped with the lifting / lowering device according to the first aspect of the present invention.

The loading tray lifting device 10 is disposed at the rear end of a loading platform (packing box in the illustrated example) 2 placed on the vehicle frame 1 of the vehicle, and is fixed below the rear end of the vehicle frame 1. Link mechanism provided symmetrically on the frame 11 and a driving device (not shown) for driving the parallel link mechanism
Is provided, and the loading platform 12 pivotally supported by the parallel link mechanism moves up and down between the loading platform 2 and the ground.
Is configured to tilt when it reaches the ground.

A drive shaft 13 is horizontally supported by the frame 11, and rotating plates 14 are fixed to both ends of the drive shaft 13, respectively.

The frame 11 has an upper link 1
The base end of the lower link 17 is rotatably supported by a pin 16 on the base end of the lower link 17.

The distal end of the upper link 15 is rotatably supported on the upper end of the mounting arm 19.

The distal end of the lower link 17 is rotatably supported by the lower end of the mounting arm 19.

That is, the lower link 17 and the upper link 1
5. The parallel link mechanism described above is constituted by the mounting arm 19 and the like.

As the driving device, an elevating cylinder (not shown) is provided on a frame 11, and a rod end of the elevating cylinder is connected to the driving shaft 13 via a rotating arm (not shown).

The base end of the loading tray 12 is rotatably supported by the mounting arm 19, and is held in a horizontal position by appropriate means when the loading tray 12 is opened.

The turning plate 14 is provided with a contact bolt (not shown) which contacts the lower surface of the lower link 17 and transmits the turning motion of the turning plate 14 to the lower link 17.

The above-described rotating plate 14, lower link 17, upper link 15, and mounting arm 19 are disposed on the frame 11 in a pair on the left and right.

The loading table lifting device 10 thus configured
By rotating the drive shaft 13 by the expansion and contraction operation of the lifting cylinder, the above-described parallel link mechanism operates up and down,
By the operation of the parallel link mechanism, the lifting and lowering operation of the loading tray 12 is performed.

During the elevating operation, the load receiving table 12 is moved up and down while keeping the horizontal state from just before the ground to the height of the load placing surface of the load table 2. Then, when the loading tray 12 reaches the ground, the tip of the loading tray 12 is tilted by a tilting mechanism (not shown) so as to contact the ground.

A rear bumper 20 is provided at the rear of the vehicle frame 1 below the rear end of the loading platform 2 so as to be vertically swingable via a rear bumper support member 20a.

More specifically, the base ends of a pair of left and right connecting arms 21 are pivotally supported on the left and right sides of the frame 11, respectively, and a rear bumper support member 20a is connected to the distal ends of the connecting arms 21.

A pair of left and right connecting rods 22 are connected between the distal end of each connecting arm 21 and the distal ends of the left and right upper links 15 respectively. When the load receiving platform 12 reaches the highest position where the load receiving platform 12 is substantially flush with the load-carrying surface of the loading platform 2 as shown by a dashed line in FIG. 1, these connecting rods 22 and the rear bumper supporting member 20
a is provided at a protruding position protruding rearward from the rear end of the vehicle frame 1.

Therefore, the upper link 15 and the lower link 1
7 rotates downward, and the load receiving platform 12 descends from the highest position to the ground. When the upper link 15 rotates downward, the connecting rod 22 acts to move the rear bumper 20 to the base end of the connecting arm 21. When the load receiving platform 12 reaches the ground, it is placed in a storage position below the vehicle frame 1 indicated by a two-dot chain line in FIG. Therefore,
The rear bumper 20 swings between the protruding position and the storage position as the loading tray 12 moves up and down.

By providing the rear bumper 20 in this manner, even if the loading tray 12 moves up and down, the loading tray 12 and the upper link 1
5 and the lower link 17 do not interfere with the rear bumper 20.

When the work between the loading platform 2 and the ground is completed, the loading platform 12 is raised and stored with the loading platform 12 positioned at the highest position as shown in FIG. As a result, the rear bumper 20 keeps the state where it is disposed at the protruding position, and the vehicle travels in this state, and the rear bumper 20 receives an external impact to protect the vehicle. Moreover, the rear bumper 20 is pivotally supported by the frame 11 on the side of the vehicle frame 1 via the connecting arm 21 and is only supported by the upper link 15 by the connecting rod 22. Most of the impact is received on the vehicle frame 1 side. Therefore, the horizontal shock absorbing function required for the rear bumper 20 is as follows.
Since most of them act directly on the frame 11, it is easy to secure necessary strength.

In the above embodiment, the lower link 1
Although the mechanism for transmitting the driving of the driving device to the upper link 15 and transmitting the driving of the driving device to the upper link 15 has been described above, a mechanism for transmitting the driving of the driving device to the upper link 15 may be employed.

FIG. 2 shows the structure of a rear bumper of a vehicle equipped with the lifting / lowering device according to the second aspect of the present invention. Note that the configuration of the loading tray elevating device 10 is the same as the configuration of the above-described loading tray elevating device, and the same reference numerals are given to the same members, and description thereof is omitted.

The rear bumper support member 30a for supporting the rear bumper 30 is connected to the left and right lower links (rotating links) 17 via a pair of left and right connecting rods 31, respectively, and via a pair of left and right operating arms 32. To the left and right sides of the frame 11 respectively.

More specifically, the upper end of each connecting rod 31 is rotatably supported on the lower surface of the lower link 17 near the upper end thereof via a bracket 31a, and the lower end of the connecting rod 31 is a rear bumper support member 30a. It is connected to. Therefore, the rear bumper support member 30a and the rear bumper 30
Is swung in the front-rear direction while being supported by the connecting rods 32 in a state in which the rearward movement is restricted by the operating arms 32 described in detail later.

Each of the operating arms 32 includes a front arm 33 and a rear arm 34 each having one end rotatably connected to each other.
It consists of a book arm.

Both ends of the front arm 33 and the rear arm 34
It is rotatably supported by the frame 11 and the rear bumper support member 30a. That is, the other end of the front arm 33 is supported by the frame 11, and the other end of the rear arm 34 is supported by the rear bumper support member 30a.

Each support shaft 33a for rotatably supporting the front arm 33 has a spring 35 as an urging member.
Are interposed respectively. One end of the spring 35 is fixed to the front arm 33 side so as to urge the front arm 33 upward around the support shaft 33a by the urging force, and the other end is provided in the middle of the support shaft 33a. It is fixed.

Next, the operation of the rear bumper 30 associated with the lifting / lowering operation of the loading / unloading device will be described.

First, when running the vehicle, the loading platform 1
2 is arranged at the highest position as shown in FIG. 2, and at this position, the receiving table 12 is placed in a stored state in which it is raised along the rear surface of the loading table 2. At this time, the rear bumper 30 is disposed at a protruding position protruding rearward from the rear end of the vehicle frame 1, and when the vehicle runs in this state, the rear bumper 30 receives an external impact to protect the vehicle. I do.

Next, when the loading tray 12 is raised and lowered, and the loading and unloading work of the luggage and the like is performed between the loading tray 2 and the ground using the loading tray 12, first, the loaded loading tray 12 is stored. After being placed in the horizontal position, the lower link 17 is turned up and down via the turning plate 14 by driving of the driving device. As a result, the loading tray 12 is moved up and down between the floor surface of the packing box 2 and the ground while maintaining the horizontal position.

Here, as described above, when the loading tray 12 is moved up and down, the rear bumper 30 is connected to the lower link 17.
1 moves downward from the state shown in FIG. 1 and moves downward by the action of the connecting arm 31 and the rear arm 34 connected to the rear bumper support member 30a. That is, since the front arm 33 is urged upward by the spring 35, first, the rear arm 34 rotates downward, and the rotation of the rear arm 34 causes the rear bumper 30 via the rear bumper support member 30a. Move downward and forward.

Then, when the lower link 17 rotates further downward, as shown by a dashed line in FIG.
The rear bumper 30 is in contact with the lower surface of the rear panel. When the lower link 17 rotates further downward with the rear bumper 30 abutting on the lower surface of the lower link 17, the forearm 33 rotates downward against the urging force of the spring 35. The rotation of the front arm 33 causes the rear bumper 3
Move 0 further down and forward. Therefore, in a state where the lower link 17 is pivoted to the lowest position and the loading tray 12 reaches the ground, the rear bumper 30 is in contact with the lower surface of the lower link 17 as shown in FIG. It is located in the lower storage position.

When the lower link 17 is rotated upward from the state where the lower link 17 is disposed at the lowest position to raise the load receiving table 12, the rear bumper 30 is operated in a reverse manner to the above-described operation.
Are arranged at the projecting position from the storage position. That is, first,
The front arm 33 is moved upward and rearward via the rear bumper support member 30a while being rotated upward by the urging force of the spring 35, and subsequently, the rear arm 34 is rotated upward so that the rear bumper 30 is rotated. 30 is arranged at the protruding position.

As described above, the rear bumper 30 is connected to the connecting rod 31, the front arm 33 and the rear arm 34 which rotate sequentially.
And is connected via the rear bumper support member 30a,
The rear bumper 3 can be moved to the protruding position and the storage position in accordance with the lifting / lowering operation of the receiving tray 12 even when the receiving tray 12 moves up and down.
0 just touches the lower link 17, and the rear bumper 30 moves the load receiving stand 12 and the upper link (follower link) 15.
There is no interference with.

The front arm 33 and the rear arm 34 constitute an operating arm 32. The front arm 33 and the rear arm 34 are rotated to move the rear bumper 30 to the projecting position. By appropriately setting the respective lengths and the like of the rear arm 34 and the connecting rod 31, the movement trajectory of the rear bumper 30 can be set more flexibly than when the operating arm 32 is constituted by a single arm. This makes it possible to arrange the rear bumper 30 above the rear end of the vehicle frame 1 as much as possible, so that a suitable rear bumper 30 corresponding to the size of the vehicle and the size of the receiving stand can be mounted, and the versatility is excellent. Can be provided.

Further, the rear bumper 30 is pivotally supported by the frame 11 on the side of the vehicle frame 1 via the operating arm 32. When the vehicle is in a running posture, the rear bumper 30 is arranged in contact with the rear of the frame 11. In addition, since the lower link 17 is only supported by the connecting rod 31, most of the horizontal impact on the rear bumper 30 is dispersed on the vehicle frame 1 side and via the left and right operating arms 32. Will receive it. Therefore, the damage to the connecting rod 31 is minimal, and the required strength can be efficiently configured.

In this embodiment, the lower link 17 has been described as an example of the rotating link rotated by the driving means, but the rotating link may be the upper link 15. That is, a mechanism for rotating the upper link by the driving means can be employed.

[0044]

As described above, according to the first aspect of the present invention, the rear bumper is disposed at the rear end of the vehicle frame via the rear bumper support member so as to be swingable in the vertical direction. A connecting rod is connected between the bumper support member and the link mechanism, and when the load receiving platform reaches the highest position, the connecting rod moves the rear bumper and the rear bumper supporting member in conjunction with the lifting / lowering operation of the load receiving platform. And the rear bumper is arranged in the storage position when the receiving platform reaches the ground, so that the rear receiving device may interfere with the rear bumper even if the loading / lowering device moves up and down. There is no. In addition, the rear bumper is located at the protruding position when the loading cradle elevating device that arranges the loading cradle at the highest position is stored, so that the rear bumper can protect the vehicle by receiving an external impact. Moreover,
Since the rear bumper is pivotally supported on the vehicle frame side, most of the impact on the rear bumper is received on the vehicle frame side, so that the impact on the loading / unloading device can be minimized.

According to the second aspect of the present invention, the same effect as that of the first aspect of the present invention can be obtained, and the front arm and the rear arm constitute an operating arm. By rotating the rear bumper to the protruding position via the rear bumper support member, the movement trajectory of the rear bumper can be set more flexibly than when the operating arm is formed of a single arm. This makes it possible to arrange the rear bumper as high as possible behind the rear end of the vehicle frame.
A suitable rear bumper corresponding to the size of the vehicle or the size of the loading tray can be mounted, and a product excellent in versatility can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a rear bumper of a vehicle including a loading tray lifting device according to the first embodiment of the present invention.

FIG. 2 is a side view showing a configuration of a rear bumper of a vehicle provided with the loading / unloading device of the invention according to claim 2;

FIG. 3 is a side view for explaining the operation of a rear bumper of a vehicle equipped with a loading tray elevating device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vehicle frame 2 loading platform 10 loading platform lifting device 12 loading platform 15 upper link 17 lower link 20 rear bumper 20a rear bumper support member 22 connecting rod 30 rear bumper 30a rear bumper support member 31 connecting rod 32 operating arm 33 front arm 34 rear arm 35 Spring (biasing member)

Claims (2)

[Claims] 1. A load receiving platform is provided at a rear end portion of a vehicle frame of a vehicle having a load platform via a link mechanism so as to be able to move up and down, and a load receiving stage elevating device having a rear bumper arranged at the rear end portion of the vehicle frame is provided. In the vehicle, the rear bumper is disposed at the rear end of the vehicle frame via a rear bumper support member so as to be vertically swingable, and a connecting rod is provided between the rear bumper support member and the link mechanism. The rear bumper is disposed at a protruding position where the rear bumper protrudes rearward of the vehicle frame when the loading cradle reaches the highest position in conjunction with the lifting / lowering operation of the loading cradle by the connecting rod, and the loading cradle reaches the ground. A rear bumper equipped with a loading tray raising / lowering device, wherein the rear bumper is arranged in a storage position stored below a rear end of the vehicle frame during operation. . 2. A load receiving platform is provided at a rear end portion of a vehicle frame of a vehicle having a loading platform via a link mechanism so as to be able to move up and down, and a load receiving stage elevating device in which a rear bumper is arranged at the rear end portion of the vehicle frame is provided. In the vehicle, the link mechanism is configured such that a rotating link that rotates up and down by driving means and a driven link that is disposed above or below the rotating link are connected to the rear end portion of the vehicle frame and a loading tray. The upper end of the connecting rod is rotatably supported near the upper end of the rotating link or driven link disposed below the link mechanism, and the lower end of the connecting rod supports the rear bumper. One end is rotatably supported between the rear bumper support member and the rear end of the vehicle frame while being connected to the rear bumper support member.
Both ends of an operating arm consisting of a front arm and a rear arm of the book are rotatably supported, and the front arm is urged upward by an urging member, so that the link mechanism rotates downward. At the time of the lowering operation of the receiving table, the rear arm is rotated downward to protrude the rear bumper to the rear of the rear end of the vehicle frame until the rotation link or the driven link disposed below contacts the rear bumper. After the lower link is guided from the projecting position and the rotating link or the driven link comes into contact with the rear bumper, the front arm rotates downward against the urging force of the urging member, and the rear bumper is moved to the vehicle frame. A rear bumper for a vehicle including a loading tray elevating device, wherein the rear bumper is configured to be guided to a storage position stored below a rear end.