JPS6014854A - Wheelchair for disabled person - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wheelchair for disabled persons having a chassis and a complete wheel with front and rear wheels.

BACKGROUND OF THE INVENTION Conventional wheelchairs for disabled persons have two wheels at the front and two at the rear, spaced apart and parallel to each other, the wheel located in the entire area usually having a larger diameter. It is configured. Furthermore, wheelchairs for disabled persons are known in which guide wheels, usually of large diameter, are arranged between power wheels of small diameter located at the front in the direction of travel. These guide wheels usually do not come into contact with the floor or the ground, but are intended for riding over curbs, etc. on sidewalks.

A drawback of such wheelchairs for disabled persons belonging to the prior art is that the position of the entire center of gravity does not always change. Since such a disabled wheelchair is used by the user, usually a paralyzed person, both at home and on the street, such a disabled wheelchair can on the one hand be used by the patient in his or her residence. It must have impeccable steering performance and comfortable street drivability in many respects. Therefore, such a wheelchair ladder for the physically disabled also has a drive device by a motor. Based on the required steering performance, the chassis usually cannot be configured very long. This means that the vehicle pressure is relatively low considering the satisfactory steering performance required for residential use. However, this relatively short pressure is a disadvantage if the wheelchair is used on the street by the user, for example by one person. In other words, when climbing over an obstacle, such as a sidewalk curb, the wheelchair will overturn due to the unfavorable position of the center of gravity.

The object of the invention is to improve a wheelchair for disabled persons so that it can be used with self-propulsion equally satisfactorily in the house and on the street, and which can also be used at the curb of a sidewalk. The purpose is to eliminate the risk of falling that occurs when climbing over normal obstacles such as.

Means for Solving the Problem This problem is solved according to the invention by making the entire front and rear wheels adjustable in movement.

According to the configuration of the present invention, all of the wheels are disposed so as to be movable and adjustable between the front wheels and the rear wheels, so that the center of gravity position of all of them can be adjusted. This construction of the wheelchair for the physically disabled allows the user to use the wheelchair both at home and on the street. For example, if it is desired to overcome an obstacle such as a sidewalk curb, everything is advantageously moved further forward, thereby increasing the stability of the wheelchair to prevent it from tipping over.

Particularly advantageous embodiments are described in claim 2. According to this embodiment, the vehicle pressure can be varied by adjusting the chassis longitudinally. The user can therefore adjust his wheelchair to a shorter length in the house than in the street, so that the requirements for perfect steering performance in the house can be met. On the other hand, by increasing the length of this wheelchair, the stability to prevent falls is increased and, moreover, the straightness of the wheelchair is improved.

On the street, disabled people therefore usually use an enlarged/palm length that directs the entire center of gravity towards the front wheels.

According to claim 6, the length of the collar can be adjusted steplessly. A fine adaptation to the particular requirements, such as the weight of the disabled person, the obstacles to be overcome, the available space, etc., is thus obtained.

This length adjustment of the chassis can be achieved by a motor according to claim A4.

For this purpose, advantageous embodiments are described in patent claims 5 to 7.

Such a near motor can be electrically driven, for example, by a battery. It is optional whether the linear motor is driven by the main drive motor of the wheelchair for physically disabled persons or by a separate drive device using a motor.

According to an embodiment of the invention, a piston-cylinder unit is used which can be actuated alternately on both sides by pressurized medium pressure, for example oil. In this case, a motor drives a pump which applies pressurized medium pressure to one or the other side of the piston in the direction of the desired adjustment of the displacement, thereby effecting the adjustment of the displacement. Its fixation can take place via a column of pressurized medium or via additional fixing elements, for example clamping eccentrics, bottles or the like.

Claim 6 describes an extremely durable and damage-resistant structure using a spindle drive. For example, the spindle can be configured to rotate driven by a motor, while the spindle nut is non-rotatably coupled to the adjustable length portion of the shaft. Both chassis parts engage telescopically, length-adjustably, internally and externally and can be arranged with respect to each other for the same +IQ purpose. Advantageously, the spindle nut and the spindle are also arranged coaxially with respect to these two/palm parts, so that a compact construction is obtained which requires little space.

In the embodiments 1 and 2, wheels with a large diameter are shown at the rear in the direction of travel, and in numbers 3 and 4, wheels with a significantly smaller diameter are shown at the front in the direction of travel. A central guide wheel 5 is arranged rotatably about a horizontal axis 6 between the front wheels 3.4. This guide wheel 5 serves primarily for overcoming obstacles, for example sidewalk curbs, and the position of the horizontal axis 6 is above the position of the horizontal axis 7 of the front wheel 3.4. Therefore, it is not normally in contact with the floor or ground. The axes of the rear wheels 1, 2 are designated by 8.

The chassis of this disabled wheelchair is generally designated by the reference numeral 9.

As shown in FIG. 1, this chassis 9 has frame parts io, ii that engage in a telescopic manner. The frame parts io, 1i are arranged coaxially with respect to each other.

The frame part 10 is integrally connected to the transverse beam 12 by welding. A wheel 3.4 having an axis 1 is also connected to this frame frame section 10 and to the transverse beam 12.

A frame part 11 is arranged radially spaced apart from the inner wall of the frame part 10 , the end face 14 of which always ends at a distance from the transverse beam 12 .

The frame part 11 is integrally connected by welding to a rear transverse beam 15, which has an axis 8.
The rear wheel 1.2 with . In this frame part 11, a spindle 16 coaxial with the frame part 10.11 is rotatably mounted on a bearing member 17. This spindle 16 can be driven in both rotational directions by means of a motor drive, which is not shown.

A nand 18 is engaged with this spindle 16,
This nut 18 is connected non-rotatably and non-movably to the tube 21 via a pin 19,20. This tube 21 is connected to the transverse beam 12. The sliding guide pieces 22, 23, which are arranged at a distance from one another, are connected to the frame part 10 in a non-rotatable and non-movable manner. As can be seen in FIG. 1, the sliding guide piece 23 is arranged in the free end region of the frame part 10.

Connected to this frame part 10 is a live part 24 for the user, which is shown only schematically between the axes 6 and 8.

By rotating the spindle 16, the frame parts 10.11 are moved relative to each other in the direction X or Y. As a result, the mutual spacing of the axes 6.8 and thus also the position of the center of gravity of the green part 24 with respect to the axes 6, 8 can be changed.

In FIG. 2, the shortest position of the chassis is shown by a solid line. In this position, the frame part 11 is moved in and out in the direction X, ie to the shortest wheelbase, so that the green part 24 is located close to the rear wheels 1, 2. The spindle 16 is moved by a motor to the frame part 1.
1 is driven to move in direction Y, axis 8
The interval between the raw portions 24 from the center is expanded.

This means that the center of gravity is moved towards the front wheels 3.4. By shifting the center of gravity forward in this way, it is possible to increase the stability of the disabled wheelchair to prevent it from tipping over when overcoming obstacles, for example curbs on sidewalks.

The spindle 16 is jointly driven by a motor which also drives the wheels. However, the features shown in the description and claims as well as in the drawings for adjusting the movement of the frame part 10.11 individually and in any combination are essential for the implementation of the invention. be.

Effects of the Invention As described above, by making it possible to adjust the movement between the front wheels and the rear wheels according to the structure of the present invention, the length of the wheelchair can be reduced (and the steering performance is excellent). By increasing the length of the wheelchair, it has become possible to obtain high stability that prevents it from tipping over, as well as perfect straightness.

[Brief explanation of the drawing]

FIG. 1 is a side view of a wheelchair for physically disabled persons according to the present invention, partially shown in longitudinal section, and FIG. 2 is a schematic plan view of the wheelchair for physically disabled persons shown in FIG. The indicated position indicates the position adjusted to the shortest vehicle pressure,
The chassis indicated by a dash-dotted line indicates its maximum extended position. 1.2.3.4...Wheel, 5...Guide wheel, 6゜7
．． 8... Axis Mfi, 9... Chassis, 10.11°
° Frame part, 12... Horizontal beam, 13... Intermediate piece, 14... End face, 15... Horizontal beam, 16...
Spindle, 17...Supporting member, 18...Nan),
19゜20...bottle, 21...tube, 22.23...
・Sliding guide piece, 24... raw part. (haka) name

Claims (1)

[Scope of Claims] 1. A wheelchair for physically disabled persons having a chassis with wheels disposed at the front and the rear and a living area, wherein the living area (24) is connected to the front wheels (3, 4) and the rear wheels (3, 4). A wheelchair for physically disabled persons, characterized in that movement can be adjusted between 1 and 2). 2. The wheelchair for physically disabled persons according to claim 1, wherein the movement of the living area (24) is adjusted by adjusting the length of the chassis (9). 2. The wheelchair for physically disabled persons according to claim 1 or 2, wherein the length of the chair (9) is steplessly adjustable. 4. Any one of claims 1 to 3, in which the rod (9) is length-adjustable in both directions (X or Y) by at least one linear motor.
Wheelchairs for disabled persons as described in Section 1. 5. The length adjustment of the chassis (9) is carried out by means of a piston-cylinder unit which can be loaded alternately on both sides by pressurized medium pressure. Wheelchairs for physically disabled persons as described in . 6. Body according to any one of claims 1 or 2 to 4, wherein the length adjustment of the chassis (9) takes place by means of a spindle drive (1ti, 18). Wheelchair for the disabled. Z The frame portions (10° 11) of the palm (9) are fixed inside and outside, and the wheels (3° 4) of one frame portion (10) are connected to the other frame portion (10). Wheelchair for disabled persons according to any one of claims 1 to 6, in which the rear wheels (1, 2) are connected to 11). 8. Wheelchair for disabled persons according to claim 7, wherein the frame part (10, 11) and the spindle drive (16, 18) are arranged coaxially with respect to each other.