JP2604877Y2 - Lifting device at the rear of van-type vehicle with parallelogram link mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device mounted on a rear portion of a van type vehicle. More specifically, the present invention relates to a lifting device that raises and lowers a gate plate between the ground and the bed by an arc movement of a link arm constituting a parallelogram link mechanism.

[0002]

2. Description of the Related Art As shown in FIGS.
A gate plate B attached to one end of the parallelogram link mechanism A moves up and down between the ground C and the bed floor D of the van-type vehicle for cargo handling. However, when the van-type vehicle travels, the gate plate B is stored facing the double door E which is hinged to the rear section of the van-type vehicle.

A double-door door E hinged to the rear of a van-type vehicle has a lock rod F for locking (FIG. 1).
Since the lock rods and the like are mounted so as to protrude further rearward from the surface of the double door E of the van type vehicle, the gate plate B is stored from the surface of the double door E. They must be fairly far apart. For this reason, at the time of cargo handling, when the double door E is opened and the gate plate B is flush with the bed floor D (that is, the gate plate B is turned 90 ° about the rotation center P in FIG. 9). A gap is created between the loading floor D and the base end of the gate plate B.
A transfer plate G is provided.

[0004] As a measure for improving this structure, there is a method utilizing a vertical trajectory of the gate plate B. That is, with the double door E open as shown in FIG. 10, the gate plate B is raised along the vertical path, and the gate plate B is flush with the floor D of the loading platform. The position where the base end of the plate B and the rear end of the bed floor D are closest to each other is set to the raised position (upper limit position), and the double door E is closed, and the raised position (upper limit position) is set.
The gate plate B is prevented from moving upward in the middle of
A restricting plate G 'for rotating the gate plate B is provided below the floor of the loading platform, and the restricting plate G' is engaged with the link arm for raising and lowering the gate plate B, whereby the gate plate B is pivoted. Is turned around by 90 °, and is stored facing the double door E (for details, see Japanese Utility Model Application Laid-Open No. 63-165 filed earlier by the present applicant.
No. 250).

In the former structure (FIG. 9), the transfer plate G must be provided near the rear end of the bed surface of the van type vehicle, and there is a problem in its installation location and operability. In the latter structure (FIG. 10), the regulating plate G 'must be disengaged each time. There is also a regulating device that can automatically operate the device, but the structure is complicated and expensive. Further, the engagement between the regulating plate G 'and the link mechanism A of the regulating device, for example, the engagement between the regulating plate G' and the tension arm, is required when the lifting device is mounted on the van-type vehicle. (The height between the ground surface and the bed surface differs depending on the size of the vehicle.) Therefore, there are various problems such as the need to adjust the site each time.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a rotation assisting device which has a simple structure, is inexpensive, and can be securely stored when the gate plate is stored. It is the purpose. That is, the base end of the gate plate B is made to be closest to the rear end of the loading floor during loading and unloading operation between the loading floor and the ground, and is attached to the door E when the double door is closed. The object of the present invention is to enable the gate plate B to be turned upward by 90 ° by the rotation restricting member H so as to be stored facing the door E.

[0007]

Means for Solving the Problems A pair of left and right double doors provided with lock rods and the like are provided at the rear part of the packing box, and a gate plate lifting / lowering device comprising a parallelogram link mechanism is provided at the lower rear part of the vehicle. Moving the gate plate up and down between the ground and the bed floor via the lifting / lowering device, and moving the gate plate up to the same level as the bed floor, and then moving the gate plate and the parallelogram link mechanism at the raised position. In a van type vehicle in which a gate plate can be rotated upward by 90 ° about a pivot axis and the gate plate can be stored facing the door outside the lock rod or the like of the double door, A regulating member protruding downward from the lower end of the door is provided at the lower outside, and when the gate plate is lifted with the double door open, the base end of the gate plate is closest to the rear end of the floor surface. Stop, and close the door When the gate plate is raised, a portion of the member constituting the parallelogram link mechanism, which faces the regulating member, abuts on the rear surface of the regulating member, and only the gate plate is pushed 90 degrees with the regulating member pressed. ° It can be turned upward, and it can be stored facing the outside of the closed door.
In the above configuration, when the top of the tension arm constituting the parallelogram link mechanism abuts on the regulating member, only the gate plate is rotatable. Further, when the top of a vertical arm pivotally mounted on the upper part of the lift arm constituting the parallelogram link mechanism comes into contact with the regulating member, only the gate plate can rotate. Further, the thickness t of the regulating member is equal to or larger than the thickness of the lock rod or the like attached to the door projecting from the outer surface of the door, and when the gate plate is retracted, it protrudes downward from the lower end of the door of the regulating member. A concave portion for preventing a portion facing the regulating member of the member constituting the parallelogram link mechanism from abutting against a rear surface of the portion, and for preventing the gasket provided at the lower end of the door from contacting the inside of the regulating member. Was provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the description of the present invention, two examples of a lifting device using a parallelogram link mechanism A will be described with reference to FIGS. In FIG. 7, a frame 2 is fixed to a lower portion of a chassis 1 of a van type vehicle.
A rotating shaft 3 is rotatably supported on the frame 2, and the rotating shaft 3 is a hydraulic cylinder 4 housed in the frame 2.
To rotate. A rotating side plate 5 is provided on both sides of the rotating shaft 3.
Is fixed. One end of a tension arm 6 is pivotally connected to the frame 2 with a pin 7, and one end of a lift arm 8 is pivotally connected to the rotating side plate 5 with a pin 9. And
The other end of the tension arm 6 is pivotally connected to the base of the gate plate B. Similarly, the upper end of the lift arm 8 is pivotally connected to the base of the gate plate B via the vertical arm 10. The upper end of the lift arm 8 is rotatably connected to the lower end of the vertical arm 10 by a pin 11.

The lifting device constructed as described above lifts and lowers the gate plate B between the rear end of the bed floor D and the ground C to perform the cargo handling work, and closes the double door E which is closed during traveling.
The gate plate B is pivoted upward by 90 ° by the hydraulic cylinder 12 to be stored so as to face and store.

Next, another drive mechanism A 'will be described with reference to FIG. In FIG. 8, a frame 21 is fixed to a lower portion of the chassis 20. A horizontal shaft 22 is supported by the frame 21, and side plates 23 are fixed to both sides of the horizontal shaft 22. The tension arm 2 is vertically arranged on the side plate 23.
4 and the base end of the compression cylinder 25 is a pin 26
And 27 respectively. The other ends of the tension arm 24 and the compression cylinder 25 are pivotally connected by pins 28 and 29 above and below the base of the gate plate B. Further, the side plate 23 and the tension arm 24
A cylinder 30 is pivotally mounted on the tip side of the cylinder. In this structure, the gate plate B is moved up and down in the horizontal state by the cylinder 30, and the gate plate B is stored by the compression cylinder 25.

Now, a regulating device for the gate plate B in such a lifting device will be described with reference to FIGS. FIG. 1 shows a state where the gate plate B has descended to the ground. Gate plate B
FIG. 2 is a rear elevational view of a van-type vehicle in a state where the vehicle is lowered to the ground and the double door F is closed. H denotes a regulating member according to the present invention, which is attached to the lower outside of the double door E and is fixed to a position (see a dashed line in FIG. 1) that matches the tension arm 6 supporting the gate plate B.

FIG. 2 shows a position where the gate plate B is raised and the rear end of the bed floor D is closest to the rear end, that is, the upper limit position, in a working state in which the double door E is opened. Since the gaps are eliminated by approaching in this way, the transfer plate G as shown in FIG. 9 is not required.

FIG. 3 shows a state in which the regulating member H contacts the upper end of the tension arm with the door E closed. The tension arm 6 to which the gate plate B is pivotally supported abuts against the rear surface of the regulating member H attached to the lower part of the door E, and only the gate plate B is moved upward by 90 degrees with the regulating member H pressed.
° It becomes possible to turn. The thickness t of the regulating member H is equal to or greater than the protrusion of the lock rod F (FIG. 1) or the like attached to the door E from the outer surface of the door to the rear when the gate plate is stored. The regulating member H hangs downward from the lower end of the door E, and the hung portion contacts the rear end surface of the cargo bed when the door is closed. The regulating member H is provided with a concave portion 31 (FIGS. 4 and 6) for protecting a gasket provided on the lower end surface of the door.

FIG. 3 shows a case in which the regulating member H comes into contact with the tension arm 6 (see the symbol X in FIG. 5A), but FIG. FIG. 5 shows a case where the upper arm 10 comes into contact with the upper end of the vertical arm 10 (see FIG. 5).
(See symbol X in (b)). As shown in FIG. 5A, the pivotal position between the distal end of the tension arm 6 and the base end of the gate plate B may be located slightly inside the base end of the gate plate B. In this case, the width w of the regulating member H must be smaller than the width W of the notch 32 at the base end of the gate plate as shown in FIG.

[0015]

[Effect] A regulating member projecting downward from the lower end of the door is provided at the outer lower part of the double door, and when the gate plate is lifted with the double door opened, the base end of the gate plate becomes the rear end of the floor surface. When the gate plate is raised at a position closest to the control member and the gate plate is lifted with the door closed, the part of the member constituting the parallelogram link mechanism facing the control member contacts the rear surface of the control member. The gate plate alone is rotatable upward by 90 ° while being in contact with and pressing the regulating member, so that it can be stored facing the outside of the closed door. With such a configuration, the clearance between the rear end of the loading platform floor and the base end of the gate plate B is minimized during loading and unloading operation by opening and closing the double door and lifting and lowering the gate plate, which may hinder loading and unloading. Absent. Since the regulating member H is attached to the lower part on the outside of the double door, the gate plate is stored in the rear part of the double door just by closing the door, and the collision between the gate plate and the door can be avoided. If the size of the rearward projecting portion of the double door is constant, the shape of the restricting member can be made constant, so that site adjustment is reduced and the component is suitable for mass production. Since the regulating member is a simple plate,
Inexpensive parts and easy to install.

[Brief description of the drawings]

FIG. 1 is a rear view of a van-type vehicle provided with a rotation restricting member.

FIG. 2 is a diagram showing a relationship between a base of a gate plate and a rear end of a floor surface during a cargo handling operation.

FIG. 3 is a diagram showing a relationship between a gate plate base and a rotation restricting member during storage.

FIG. 4 is an enlarged view of a base of a gate plate in FIG. 3;

FIG. 5 is a diagram showing an engagement portion between a rotation restricting member and a parallelogram link mechanism.

FIG. 6 is a detailed view of a rotation restricting member and a mounting portion thereof.

FIG. 7 is a view showing an example of a known parallelogram link mechanism.

FIG. 8 shows another example of the parallelogram link mechanism.

FIG. 9 shows a known gate plate and a handover plate at the rear end of the bed.

FIG. 10 shows a known regulating plate.

[Explanation of symbols]

A Parallelogram Link Mechanism A '(Other) Drive Mechanism B Gate Plate C Ground D Loading Floor E Double Door F Lock Rod G Transfer Plate G' Regulatory Plate H Regulatory Member 1 Chassis 2 Frame 3 Rotary Shaft 4 Hydraulic Cylinder 5 Rotation side plate 6 Tension arm 7 Pin 8 Lift arm 9 Pin 10 Vertical arm 11 Pin 12 Hydraulic cylinder 20 Chassis 21 Frame 22 Horizontal axis 23 Side plate 24 Tension arm 25 Compression cylinder 26, 27, 28, 29 Pin 30 Cylinder 31 Recess 32 Notch Department

Claims (4)

(57) [Scope of request for utility model registration] 1. A pair of left and right double doors provided with lock rods and the like at a rear part of a packing box, and a gate plate elevating device comprising a parallelogram link mechanism at a lower rear end of the vehicle. After raising and lowering the gate plate up and down between the ground and the bed floor via, and ascending to the level with the bed floor,
At the raised position, the gate plate is turned upward by 90 ° about the pivot axis between the gate plate and the parallelogram link mechanism so that the gate plate faces the outside of the lock rod or the like of the double-door type door. In a van type vehicle that can be stored
A regulating member that protrudes downward from the lower end of the door is provided at a lower part of the outside of the double-door, and when the gate plate is lifted with the double-door opened, the base end of the gate plate is at the rear end of the floor surface. When the gate plate is lifted with the door closed and the gate plate is raised with the door closed, the portion of the member constituting the parallelogram link mechanism, which faces the regulating member, is located on the rear surface of the regulating member. A van-type vehicle provided with a regulating member, wherein only the gate plate is rotatable upward by 90 ° in a state where the regulating member is in contact with the regulating member and is pressed against the outside of the closed door; Rear gate board lifting and lowering device. 2. When the top of a tension arm constituting the parallelogram link mechanism abuts on the regulating member, only the gate plate is rotatable.
A gate plate lifting / lowering device and a storage device at a rear portion of a van-type vehicle provided with the restricting member described in the above. 3. The method according to claim 2, wherein only the gate plate is rotatable when a top of a vertical arm pivotally mounted on an upper portion of the lift arm constituting the parallelogram link mechanism abuts on the regulating member. An ascent / descent and storage device for a gate plate at the rear of a van-type vehicle, comprising the regulating member according to claim 1. 4. The thickness (t) of the regulating member is equal to or greater than the thickness of the lock rod or the like attached to the door protruding from the outer surface of the door, and when the gate plate is stored, the lower end of the door of the regulating member. A portion of the member constituting the parallelogram link mechanism, which is opposed to the regulating member, is brought into contact with the rear surface of the portion projecting downward, and the inside of the regulating member is brought into contact with a gasket provided at the lower end of the door. 4. A device for raising and lowering a gate plate at a rear portion of a van-type vehicle provided with a restricting member according to claim 1, wherein a concave portion is provided for avoiding the problem.