JPS5939078Y2 - lift device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an elevating device used for loading and unloading a wheelchair for a physically handicapped person, luggage, etc. from a vehicle.

As shown in Japanese Utility Model Publication No. 53-24006, a conventional lifting device of this type has a base end of a driving arm forming one side of a parallel four-way link mechanism fixed to a driving shaft, and a small One end of the arm piece is fixed, the other end of this small arm piece is connected to the piston rod tip of a fluid pressure cylinder device, and the small arm piece is rotated by the cylinder device to rotate the driving shaft. The driving arm was rotated to raise and lower the driving arm.

However, since such a conventional vehicle requires a small arm piece, this small arm piece protrudes below the floor surface of the vehicle, which poses a problem in terms of installation.

In addition, a strong bending stress acts on the small arm piece and the driving arm, which is disadvantageous in terms of design.

The present invention was developed in view of these points, and aims to simplify the structure by eliminating the need for small arm pieces, eliminate the bending stress that tends to occur in the lifting and lowering operation parts, and solve problems with the bodywork. be.

Embodiments of the present invention will be described based on the drawings.

Brackets 2 are erected on both sides of the rear opening of the floor surface 1 of a vehicle, for example, a van truck, and the base ends of the upper arm 3 and lower arm 4 are attached to the brackets 2 on both sides via support shafts 5 and 6, respectively. A stay arm 7 is rotatably attached to the shaft and is vertical between the tips of the surface arms 3 and 4.
The upper end slanted portion 8 is rotatably mounted via support shafts 9 and 11, and the bracket 2, upper arm 3, lower arm 4, and upper end slanted portion 8 form a parallel four-way feed link mechanism. form 12.

Also, the four support shafts 5 of the parallel four feed link mechanism 12.
6. 9.11, a hydraulic cylinder device 13 for hydraulic pressure, for example, an oil pressure, is interposed between the diagonal support shafts 6 and 9.

That is, the cylinder body 14 of the hydraulic cylinder device 13
The base end of the piston rod 15 of the hydraulic cylinder device 13 is rotatably attached to the support shaft 9, and the tip end of the piston rod 15 of the hydraulic cylinder device 13 is rotatably attached to the support shaft 9.

A hydraulic pressure supply circuit is connected to one end and the other end of the cylinder body 14.

Further, the inner end of a platform 17 serving as a mounting plate is rotatably attached between the lower ends of the stay arms 7 on both sides via a support shaft 16.

Further, a shaft support 18 is protruded from the middle part of the stay arm 7, and one end of an upper horizontal holding link 21 is rotatably attached to this shaft support 18 via a support shaft 19. One end of a lower horizontal holding link 23 is rotatably attached to the other end of the holding link 21 via a spindle 22, and the other end of this lower horizontal holding link 23 is attached to the platform via a spindle 24. It is rotatably attached to the side of 17.

Then, as shown by the solid line in FIG. 1, when hydraulic pressure is supplied to the lower end of the cylinder body 14 of the hydraulic cylinder device 13 to push up the piston rod 15, the gap between the support shafts 6 and 9 is increased. Spreading out, the entire parallelogram linkage 12 rises, and the platform 17 held horizontally by the horizontal holding links 21, 23 at the lower end of the stay arm 7 rises to the same height as the floor 1. be done.

Further, as shown by the chain line in FIG. 1, when the hydraulic pressure at the lower end of the cylinder body 14 of the hydraulic cylinder device 13 is released, the weight of the platform 17 acts on the piston, pushing down the piston rod 15, and the support shaft 6 As the distance between the two sides becomes narrower, the entire parallelogram link mechanism 12 moves downward, and the horizontally held platform 17 descends to the ground G.
grounded.

When storing this elevating device, as shown in FIG. Reference numeral 31, which is folded between the shaped link mechanisms 12, is a bank door of a van truck.

Further, the hydraulic cylinder device 13 is omitted in FIG. 3.

In this embodiment, the parallelogram link mechanism 12 and the hydraulic cylinder device 13 for driving this mechanism 12 are provided on both sides, but in some cases, the hydraulic cylinder body 13 on one side may be
may be omitted, and furthermore, the parallelogram link mechanism 12 on one side may be omitted and the platform 17 may be supported on a cantilever.

Further, in this embodiment, the hydraulic cylinder device 1 is provided between the support shafts 6 and 9.
However, depending on the case, the hydraulic cylinder device 13 may be interposed between the support shafts 5 and 11. In this embodiment, the side portion on the tip side of the parallelogram link mechanism 12 is formed by a part of the stay arm 7, but in some cases, the member forming the side of the distal end of the parallelogram linkage mechanism 12 and the stay arm 7 may be separate members, and the distal end side of the parallelogram link mechanism 12 may be The member forming the side portion and the stay arm 7 may be fixed to the support shaft 11 and integrated.

As described above, according to the present invention, the base end of the cylinder body and the tip of the piston rod of the fluid pressure cylinder device are rotated around two diagonally located support shafts among the four support shafts of the parallelogram link mechanism. Since it has a movably connected structure, the following effects can be obtained.

There is no longer a need for a small arm piece to drive the driving shaft as in the past.

Since this small arm piece always rotates from above to below the floor surface, it is necessary to make a notch in the floor surface corresponding to the small arm piece, but this cutout in the floor surface is strictly prohibited on monocoque vehicles. Oh, if you really need to cut out the
A strength test report is required for each unit, which is very expensive.

There is no need for a cylinder box or a dedicated support shaft to support the fluid pressure cylinder device, which was required in the past, and this cylinder box-less structure significantly reduces weight and makes it easier to check the inside of the vehicle. For example, it is easy to check the lashing status of a wheelchair from the outside.

When the driving shaft is rotated by the small arm piece as in the past, twisting and bending stress is generated in the small arm piece and the driving shirt I, and the driving arm of the parallelogram link mechanism is also bent. So,
Sufficient strength design is required, but parallel 4
When a hydraulic cylinder device is installed directly diagonally to the side link mechanism, only a vertical load of tension or compression is generated between each support shaft, and there is no risk of torsion or bending stress being generated. It can be designed using components, and weight can be reduced from this point of view as well.

Further, according to the present invention, the parallelogram link mechanism is formed into a hollow three-dimensional shape, and the fluid pressure cylinder device is housed inside the parallelogram link mechanism, so that the following effects are achieved. can get.

With the same mounting plate width as the conventional one, the total width between the right and left sides of the entire lifting device is smaller than that of the conventional one, which is advantageous in terms of mounting.

For example, in the case of the conventional parallelogram link mechanism and the cylinder box that supports the fluid pressure cylinder device, the total width between the left and right sides of the lifting device becomes larger, and the width of the cylinder box and the side of the vehicle increases accordingly. Therefore, the power unit for supplying fluid pressure to the fluid pressure cylinder device is installed on the top of the tire house, but as in this invention, the fluid pressure cylinder device is If it is built into the inside of the link mechanism, the total width between the left and right sides of this lifting device will be reduced, and the space between the parallel 4 feed link mechanism and the side of the vehicle will be increased accordingly. It becomes possible to install the above-mentioned power unit, etc., and the interior area (loadable area) can be increased.

Compared to the conventional parallel-four feed link mechanism, which is formed by sequentially pivoting one plate, the parallel-four feed link mechanism of the present invention is formed in a hollow three-dimensional shape, so the section modulus against lateral loads is lower. It is large, has high rigidity against lateral vibration, and has high stability.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the elevating device of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a side view of the elevating device in its stored state. 5, 6. 9.11...Spindle, 7...
- Stay arm, 12... Parallel four feed link mechanism, 13... Hydraulic cylinder device as a fluid pressure cylinder device, 17... Platform as a mounting plate.

Claims (1)

[Scope of utility model registration request] Parallel 4 feed link mechanisms are provided at both left and right ends of the opening of the vehicle, and in the parallel 4 feed link mechanisms on both sides, a member forming a side portion on the tip side and a vertical stay arm are integrally provided, In this lifting device in which a mounting plate is provided between the lower ends of the stay arms on both sides, the parallel 4 feed link mechanism is formed into a hollow three-dimensional shape, and a fluid pressure cylinder is installed inside the parallel 4 feed link mechanism. The device is stored, and the base end of the cylinder body and the tip of the piston rod of this fluid pressure cylinder device can be freely rotated around two diagonally located support shafts among the four support shafts of the parallel four feed link mechanism. A lifting device characterized by being connected to.