JP3463024B2 - Wheelchair bumper - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a level difference eliminating machine that enables a person with a lower limb disability to climb over a level difference while riding on a wheelchair. The present invention relates to a step-eliminating machine that functions as a lifter, and the step-eliminating machine itself does not have a drive source, is lightweight and compact, and can also be used as a stepladder for a wheelchair.

[0002]

2. Description of the Related Art One of the biggest obstacles for persons with lower limbs who use wheelchairs is a step existing in a passage.
Such steps exist at the entrance to the building, especially at the entrance to the house, between the entrance dirt and floor, and between the terrace and garden.
If the step is low, such as the threshold of a door or sliding door, the step can be easily eliminated by installing a slope. It is possible to move between floors of a building used by a large number of people by using an elevator. The biggest obstacle in daily movement is the step between the house and the outdoors. The step normally present in this portion does not have enough space around it to provide a slope for eliminating the step. Various structures have been proposed to provide the wheelchair itself with a function of overcoming a step, but the step at the entrance of a residence is much higher than the height that can be overcome by such a structure.
For this reason, it is necessary to use a lift-type step-eliminating machine having a structure for raising and lowering a wheelchair that has been stepped in between the upper and lower surfaces of the step.

This type of level difference eliminating machine is required to have higher safety, not to be provided with a rugged guide frame in the surroundings, and to have the lowered position as close to the installation floor surface as possible, but it is mechanical. Is not much different from lifters used in logistics systems. Therefore, various types of structures of this type of level difference eliminating machine are possible, and a level difference eliminating machine for raising and lowering a pallet by using a mechanism such as a ball screw, a pantograph, and a chain with a motor as a drive source can be realized. .

[0004]

A conventional lift type step eliminating machine uses a motor as a lifting drive source and is a sturdy and heavy apparatus on the assumption that it is installed at a fixed position. This is fine if it is used by placing it at the entrance of the house, but if you want to install it at the back door or on the edge of the garden, for example, you must install multiple level difference elimination machines.
For example, it is not realistic to install a lifter in such a part in consideration of a closet or an object in a high place of a closet.

[0005] Even when a person with a normal ability climbs up to the bed of a truck, there is a high step that hinders the movement, and an object in a high place that cannot be reached cannot be taken. In such a case, a healthy person uses a stepladder. Since the stepladder does not lift people, you have to climb on the stepladder with your own feet, but it is light and easy to carry, and the fact that it can be temporarily and easily installed anywhere brings great usefulness.

The present invention provides a step-eliminating device which can be conveniently used for multiple purposes in order to rationally eliminate the inconvenience encountered by persons with lower extremities using wheelchairs in their daily activities. Is an issue.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a parallel plate 2 for supporting a drive wheel of a wheelchair is mounted on a base plate 2 for mounting the wheelchair.
The above problem is solved by axially supporting each friction roller 13, decelerating the rotation of the friction roller with a speed reducer including a worm gear, and operating the lifting mechanism of the base plate 2 using a pantograph mechanism. There is. As the lifting mechanism, conventionally, various structures are known, but since the drive member also serves as a guide member, the device can be lightened, and it is not necessary to provide an awkward guide frame.
It uses a pantograph mechanism .

The height of the lower end of the base plate 2 should be as close as possible to the floor on which the device is installed, in order to facilitate the entry of the wheelchair onto the base plate. However, if the base plate is lowered to a low position, when the base plate is lowered in a general pantograph mounting structure, the pantograph becomes a flat shape, and a very large force is required to raise the base plate. This is necessary, and further, the frictional resistance becomes large, which causes a problem that the ascending operation cannot be performed. In order to solve this, in the present invention, the pivot points 20 and 21 connecting the pantograph mechanism and the base plate are provided at a position higher than the base plate 2 so that the X-axis of the pantograph mechanism can be achieved even when the base plate reaches the lower end. The character shape is maintained.

In a preferred embodiment, the pantograph mechanism 24 is disposed on the left and right outside of the base plate 2, and the rotation of the friction roller 13 is transmitted to the ball screw 17 in the wheelchair advancing direction by the worm wheel 18, and the ball screw causes the pantograph mechanism to move. Nut member 2 connected to the mechanism
3 is driven in the front-back direction.

In order to reduce the weight of the device, it is preferable that the device has a frame structure, preferably a frame structure using a hollow material, and that the base plate on which the wheelchair is placed is provided only on both sides of the wheel of the wheelchair.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the step eliminating device of the present invention will be described below with reference to the embodiments shown in FIGS. 1 is a side view of the embodiment, FIG. 2 is a plan view,
3 and 4 are views taken along arrows A and B in FIG. The step eliminating device of the illustrated embodiment includes a base frame 1 and an elevating frame 3 provided on both sides with a base plate 2 for supporting wheels of a wheelchair, and an X-shaped pantograph mechanism for vertically connecting the left and right sides of the base frame and the elevating frame. And its drive mechanism. The base frame 1 is formed of a hollow material, preferably an aluminum hollow material, in the shape of a lattice frame, and the lower end of the first pantograph link 4 is provided with pins 5 at the left and right rear ends thereof.
Is pivoted at. Spline shafts 6 of ball splines on both left and right sides of the base frame 1 are installed in the front-rear direction, and a lower end of a second pantograph link 8 is pivotally supported by a pin 9 on a slide block 7 fitted to the spline shaft. . The first pantograph link 4 and the second pantograph link 8 are pivotally attached at their intermediate points by a center pin 10 to form an X shape.

The elevating frame 3 has a structure in which the base plates 2 elongated in the front-rear direction, which are arranged on the left and right, are integrally connected by a connecting member 11. The same weight as the base frame is used to reduce the weight.
When a wheelchair closer to the rear than the intermediate position in the front-rear direction is placed on the base plate 2, a window 12 is provided at a position corresponding to a position directly below the drive wheel of the wheelchair. Book friction rollers 13, 13 are pivotally supported. At the outer end of one of the friction rollers 13,
The worm 14 is fixed, and the shaft 25 connects the left and right friction rollers.

A coupling 1 is provided along both sides of the lifting frame 3.
The wheel shaft 16 and the ball screw 17 connected by 5 are mounted on the same axis in the front-rear direction. The wheel shaft 16 is arranged at a rear portion of the elevating frame, and a worm wheel 18 meshing with the worm 14 is fixed. Brackets 19 are erected on the left and right rear ends of the elevating frame 3, and the upper ends of the second pantograph links 8 are pivotally attached to the upper ends thereof by pins 20. First Pantograph Link 4
A nut bracket 21 is attached to the upper end of the above in a state of being suspended downward by a pin 22, and a ball nut 23 fixed to the lower end of this nut bracket is screwed onto the ball screw 17.

In the above structure, the wheelchair is mounted on the base plate 2 and its driving wheels are two friction rollers 1.
The wheelchair is stopped at the position supported by 3 and 13. When the drive wheel of the wheelchair is rotated, the rotation is transmitted to the ball screw 17 via the friction roller 13, the worm and the wheels 14 and 18, and the rotation of the ball screw 17 causes the nut bracket 21 to move forward and backward, thereby causing the pantograph device 24 to move. Is operated, the elevating frame 3 is moved up and down, and the wheelchair mounted thereon is moved up and down. Since the upper ends of the pantograph links 4 and 8 are pivotally supported at positions above the elevating frame 3 via the bracket 19 and the nut bracket 21, even if the elevating frame 3 is lowered to near the installation floor surface, the pantograph links 4 and 8 will be described. The X-shaped shape of the mechanism is maintained and the pantograph mechanism does not malfunction. Further, since the speed reduction mechanism is interposed between the worm and the wheel in the rotation transmission mechanism of the friction roller 13, the self-locking mechanism works and the elevating frame 3 descends by its own weight even when the drive wheels of the wheelchair are freely rotated. Can be prevented.

[Brief description of drawings]

FIG. 1 shows a side view of an embodiment.

2 shows a plan view of FIG.

FIG. 3 shows a view on arrow A of FIG.

FIG. 4 shows a view on arrow B of FIG.

[Explanation of symbols]

2 base plates 13 Friction roller

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatoshi Hizu 2-11-15 Miguchi Shinmachi, Kanazawa City, Ishikawa Prefecture 306 (72) Taikanso 306 (72) Inventor Mama Maekawa 145-1, Miroku Town, Kanazawa City, Ishikawa Prefecture (72) Invention Tetsuro Takahashi 2-8-5 Jonan, Kanazawa-shi, Ishikawa Prefecture (72) Inventor Akio Nagata 86 86 Inui-cho, Matsuto-shi, Ishikawa Uchi-Nihon System Co., Ltd. (56) Reference JP 2000-344476 (JP, A) Actual Kaihei 5-40530 (JP, U) Registered utility model 3018710 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B66F 7/06 A61G 5/00

Claims (2)

(57) [Claims] 1. A base plate for mounting a wheelchair (2), and lift mechanism of this base plate <br/>, 2 pieces of the friction roller parallel to and axially supported to the base plate supporting the drive wheels of the wheelchair and (13), e Bei a drive coupling mechanism for transmitting the rotation of the friction roller to said elevating mechanism through a reduction gear, the reduction gear c
A speed reducer including a home gear, wherein the lifting mechanism is a pantograph.
A step-eliminating machine for wheelchairs, which is a graph mechanism . 2. The pantograph mechanism is higher than the base plate (2).
2. The step removing device for a wheelchair according to claim 1, wherein the step removing device is pivotally attached to the base plate at a certain position .