JP2000042043A - Wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheelchair by which a helper can care the back part of a person to be cared in the state where the person keeps a comfortable and stable sitting position. SOLUTION: In this wheelchair provided with a seat plate, a pair of upper frames 1 respectively provided from both sides of the seat plate projectingly upwards and a backrest part 2 provided between the pair of the upper frames 1 whose one surface is abutted to the back part of the person to be cared and moved in front and back directions, for the backrest part 2, a lower end part 23 abutted to the back lower part of the back part is supported by the pair of the upper frames 1 and an upper end part 24 is freely movable backwards.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheelchair that is used by a cared person in need of nursing care and moves in the front-rear direction.

[0002]

2. Description of the Related Art As a conventional example of this kind of wheelchair, there is one having a configuration shown in FIG. 11 disclosed in, for example, JP-A-7-308345. This is provided with a pair of upper frames A, A provided with a seat plate A1 and protruding upward from both sides of the seat plate A1, and a pair of upper frames A, A provided between the pair of upper frames A, A, and one face B1 is provided. And a backrest portion B in contact with the back portion.

[0003] More specifically, the backrest portion B has a lower end portion B2 and an upper end portion B3 which contact the lower portion of the back portion, and the lower end portion B2 and the upper end portion B3 are fixed to the pair of upper frames A, A. , The pair of upper frames A, A is a fulcrum A2.
Is rotated about the rotation axis, and the whole is movable rearward.

[0004]

In the above-mentioned conventional wheelchair, the cared person can move in the front-rear direction with a comfortable posture by contacting the back with the backrest.

[0005] However, for example, when a caregiver is washing his / her back, the pair of upper frames A, A
The work space for washing the back part behind the back part of the cared person is formed by turning the work part 2 about the rotation axis. At this time, the entire backrest portion B including the lower end portion B2 and the upper end portion B3 rotates about the fulcrum A2 as a rotation axis and can move rearward, so that the care receiver loses body support and is supported forward. A part is appropriately provided, and the back part is washed while the body is supported by the support part or while being supported by the caregiver. That is, the cared person has to be in a distressed and unstable sitting position, or the caregiver has to work in an unstable position supporting the cared person.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a structure in which a caregiver holds a caregiver's back while maintaining a comfortable and stable sitting position. An object of the present invention is to provide a wheelchair that can be easily cared for.

[0007]

In order to solve the above-mentioned problems, the present invention is characterized in that a seat plate 11 is provided and a pair of upper frames 1 projecting upward from both sides of the seat plate 11 respectively. , 1 and a backrest 2 provided between the pair of upper frames 1 and 1 and having one surface 21 in contact with the back 31 of the care receiver 3. In a wheelchair moving at least in the front-rear direction, the backrest 2 is provided. The lower end portion 23 of the back portion 31 abutting on the lower back portion 31a is supported by the pair of upper frames 1 and 1, and the upper end portion 24 can be movably moved rearward.

According to a second aspect of the present invention, in the first aspect, the backrest portion 2 is provided with two extension belts 4, 4 extending to both sides of the upper end portion 24. Is straddling the upper frame 1 and the other end 22
It is configured to be removably attached to.

According to a third aspect, in the second aspect, a belt insertion portion 25 having an insertion hole 25a is provided on the other surface 22 side of the backrest portion 2;
Each of the extension belts 4 inserted through the insertion hole 25a has a configuration in which a locking stopper 41 that locks on the belt insertion portion 25 is provided at one end portion 42 that is separated from the belt insertion portion 25 by a predetermined distance δ. .

According to a fourth aspect, in the first aspect, the backrest portion 2 is provided with one extension belt 4a and the other extension belt 4b extending to both sides of the upper end portion 24, respectively. One extension belt 4a is fixed to one of the upper frames 1a, and the other extension belt 4b extends over the other upper frame 1b.
Is detachably attached to the other surface 22.

According to a fifth aspect, in the fourth aspect, a belt insertion portion 25 having an insertion hole 25a is provided on the other surface 22 side of the backrest portion 2;
The other extension belt 4b inserted into the insertion hole 25a is
A locking stopper 41 for locking to the belt insertion portion 25 is provided at one end portion 42 separated from the belt insertion portion 25 by a predetermined distance δ.

According to a sixth aspect of the present invention, in the first aspect, the backrest portion 2 is provided with one extension belt 4a and the other extension belt 4b extending to both sides of the upper end portion 24, respectively. The extension belt 4a, which straddles one of the upper frames 1a, is formed in a ring shape and has a piece 7 of a ring portion 7 having one piece 71 and another piece 72 opposed to each other.
1 and the other extension belt 4b straddling the other upper frame 1b, and detachably attaches and detaches each of the overlapping portions 43 formed by folding over the other piece 72 of the ring portion 7. A configuration 44 is provided at a position corresponding to the overlapping section 43.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the other extension belt 4b is configured such that a locking stopper 41 for locking the ring portion 7 is fixed from another piece 72 of the ring portion 7. It is configured to be provided at one end 42 separated by a distance δ.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes an upper frame, which is provided with a seat plate 11 at the lower end by a long metal tube, and is provided so as to protrude upward from both sides of the seat plate 11 in the front-rear direction. Then, the handrail frame 12 is installed between the pair of upper frames 1 and 1.

Reference numeral 2 denotes a backrest, which is formed in a substantially rectangular shape by a cloth, has one surface 21, another surface 22, a lower end 23, and an upper end 24, and is provided between the pair of upper frames 1, 1. One side 21 is on the back 31 of the care receiver 3 and the lower end 2
3 come into contact with the lower back 31a of the back 31 respectively.
Here, the supporting portions 23 a are provided to protrude from both sides from the lower end 23 and are fixed to the respective upper frames 1, and the lower end 23 is supported by the pair of upper frames 1. Further, two belt insertion portions 25 each having an insertion hole 25a are fixed to the upper end portion 24 on the other surface 22 side at positions near the pair of upper frames 1 and 1. Here, the upper end 24 is movably moved rearward. This will be described later in detail.

Reference numeral 4 denotes an extension belt, which is formed in an elongated shape with a cloth, is extended to both sides of the upper end portion 24 of the backrest portion 2 and is formed integrally with the backrest portion 2.
1 is provided at one end 42 separated from the belt insertion portion 25 by a predetermined distance δ. Each extension belt 4 is folded over the upper frame 1, inserted into the insertion hole 25 a of the belt insertion portion 25, and one end 42 is detachably attached to the other surface 22 of the backrest 2 with a velcro tape or the like. .

The lower frame 5 is formed as a pair by projecting downward from both sides along the front-rear direction of the seat plate 11 with a long metal tube. A seat plate tube 51 fixed to the seat plate 11, an intermediate tube 52 bent downward and a projecting tube 53 projecting forward and backward from the intermediate tube are formed. Then, the four wheels 54 are attached to the protruding tube 53 and move at least in the front-back direction.

The handling operation of this will be described. First, as shown in FIG. 1, in a state where the care receiver 3 is on board,
Each extension belt 4 is inserted into the insertion hole 25 a of the belt insertion portion 25, and one end 42 is attached to the other surface 22 of the backrest 2, and the care receiver 3 has the back 31 on the one surface 21 of the backrest 2. , The lower back 31 a is the lower end 23 of the backrest 2.
Contact each other.

Next, as shown in FIG. 4 to FIG. 6, the backrest portion 2 is configured such that each of the extension belts 4 has one end 42 at the backrest portion 2.
When the stoppers 41 are removed from the other surface 22 and each of the locking stoppers 41 is locked to the belt insertion portion 25, the lower end portion 23 is supported by the pair of upper frames 1, 1 and the upper end portion 24 is separated by a predetermined distance δ.
Is moved rearward in a state of being curved by a dimension corresponding to the above, and a working space 2 a is formed between the pair of upper frames 1 and 1 and the backrest 2. And the caregiver is the cared person 3
The lower back 31a is brought into contact with the lower end 23 of the backrest 2 to wash and care for the back 31 of the cared person 3 using the formed work space 2a while maintaining a stable sitting position. .

Next, the backrest portion 2 is moved so that each extension belt 4 pulls each locking stopper 41 toward the center portion by a predetermined distance δ, and one end portion 42 is attached to the other surface 22 of the backrest portion 2 again. To return to the original state without the work space 2a.

In the wheelchair of the first embodiment,
As described above, the backrest 2 has the lower end 23 and the upper end 24 that contact the lower back 31a of the back 31.
The lower end 23 is supported by the pair of upper frames 1, 1,
When the upper end 24 of the backrest 2 is moved rearward because the upper end 24 is movably moved rearward, for example, a work space 2a for washing the back 31 of the care receiver 3 is provided between the pair of upper frames 1 and 1. The care receiver 3 is formed between the backrest 2 and the lower back 31 a of the lower end 23 of the backrest 2.
The caregiver can easily care for the back 31 of the care receiver 3 in a stable posture using the work space 2a formed by the caregiver while maintaining a stable sitting position by contacting the caregiver.

The backrest 2 is provided with two extension belts 4 and 4 extending to both sides of the upper end 24, and each extension belt 4 straddles the upper frame 1 and connects one end 42 to the other surface of the backrest 2. 22, the one end 42 of each extension belt 4 is detached from the other surface 22 of the backrest 2, and the upper end 24 of the backrest 2 is moved rearward to easily work space 2 a. Can be formed.

Further, a belt insertion portion 25 having an insertion hole 25a is provided on the other surface 22 side of the backrest 2, and a locking stopper 41 is provided at each of the extension belts 4 separated from the belt insertion portion 25 by a predetermined distance δ. The extension belt 4 inserted into the insertion hole 25 a of the belt insertion portion 25 is provided at the one end 42 of the backrest 2.
And the locking stoppers 41 are removed from the belt insertion portions 2.
5, the upper end 24 of the backrest 2 moves rearward by a dimension corresponding to the predetermined distance δ, and
a can be formed with high dimensional accuracy, and each locking stopper 41 can be pulled toward the center by a predetermined distance δ to easily return the backrest 2 to its original state.

In the first embodiment, the backrest 2 is formed of cloth, and the upper end 24 of the backrest 2 is movably moved by the extending belts 4 and 4 extending to both sides of the upper end 24. Although it was movable, the backrest 2 is formed of a plate, and the lower end 23 of the backrest 2 is rotatably supported by the pair of upper frames 1, and the upper end 24 is rotated to be movable rearward. It is good also as what is movable, and it is not limited.

A second embodiment of the present invention will be described below with reference to FIGS. In the second embodiment, functions different from those in the first embodiment will be described, and members having substantially the same functions as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted. In the second embodiment, the pair of upper frames 1 and 1 are formed by one upper frame 1a and the other upper frame 1b, and the backrest 2 has the insertion portion 25 at a position near the other upper frame 1b. One is fixed.

The extension belt 4 is connected to the upper end 2 of the backrest 2.
4 comprises one extension belt 4a and the other extension belt 4b respectively extended to both sides, and is formed integrally with the backrest 2 so that the one extension belt 4a is connected to the one upper frame 1a.
Fixed to On the other hand, the extension belt 4b is connected to the one end 4 where the locking stopper 41 is separated from the insertion portion 25 by a predetermined distance δ.
2 and is folded over the other upper frame 1b, inserted into the insertion hole 25a of the belt insertion portion 25, and one end 42 is detachably attached to the other surface 22 of the backrest 2 with the magic tape 6 or the like. It is attached.

The handling operation of this will be described. First, as shown in FIG. 7, the other extension belt 4b is inserted into the insertion hole 25a of the belt insertion portion 25, one end 42 is attached to the other surface 22 of the backrest 2, and the care receiver 3 is moved to the back. 31 is provided on one surface 21 of the backrest 2 and a lower back 31a.
Contact the lower end 23 of the backrest 2 respectively.

Next, as shown in FIG.
The other end of the extension belt 4b is removed with one hand from the other surface 22 of the backrest 2 with the one end 42, and the locking stopper 4b is removed.
1 is locked to the belt insertion portion 25, the lower end portion 23 is supported by the pair of upper frames 1a and 1b, and the upper end portion 24 is moved rearward in a state of being curved by a dimension corresponding to the predetermined distance δ, and the work space 2a is a pair of upper frames 1a, 1
b and between the backrest 2.

Next, the other extension belt 4b is pulled with one hand to pull the locking stopper 41 toward the one upper frame 1a by a predetermined distance δ, and the one end 42 is attached to the other surface 22 of the backrest 2 again. The backrest 2 moves forward and returns to the original state without the work space 2a.

In the wheelchair of the second embodiment,
As described above, the backrest portion 2 is provided with the one extension belt 4a and the other extension belt 4b which are respectively extended on both sides of the upper end portion 24, and the one extension belt 4a is fixed to the one upper frame 1a, The other extension belt 4b straddles the other upper frame 1b and has one end 42 at the backrest 2
The other end 22 of the extension belt 4b is detached from the other surface 22 of the backrest 2 with one hand, and the upper end 24 of the backrest 2 is moved rearward. The working space 2a can be easily formed with one hand, and the one end 42 can be mounted on the other surface 22 and similarly returned to the original state with one hand.

Further, the belt insertion portion 25 is provided on the other surface 22 side of the backrest portion 2, and the locking stopper 41 is provided on one end 42 of the other extension belt 4b separated from the belt insertion portion 25 by a predetermined distance δ. When the extension belt 4b is detached from the other surface 22 of the backrest 2 at one end 42 and the locking stopper 41 is locked to the belt insertion portion 25, the upper end 24 of the backrest 2 is moved to the predetermined distance δ. The working space 2a can be formed with high dimensional accuracy by moving backward by a corresponding dimension, and the locking stopper 41 is pulled toward the one upper frame 1a by a predetermined distance δ to easily return the backrest 2 to the original state. Can be restored.

A third embodiment of the present invention will be described below with reference to FIGS. Note that in the third embodiment, the first
Functions different from those of the first embodiment will be described, and members having substantially the same functions as those of the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

The extension belt 4 is connected to the upper end 2 of the backrest 2.
4 includes one extension belt 4a and the other extension belt 4b extending to both sides, respectively, and is formed integrally with the backrest 2. Reference numeral 7 denotes a ring portion, which is formed of metal or resin into a square ring shape, and has one piece 71 and another piece 7 opposed to each other.
2 is provided, and one piece 71 is fixed to one end 42 of the extension belt 4a while straddling one upper frame 1a.

Then, the other extension belt 4b is folded over the other upper frame 1b, and then over the other piece 72 of the ring portion 7 to form the overlapping portion 43 overlapping the other surface 22 of the backrest portion 2. Form. An attaching / detaching portion 44 made of a magic tape or the like is provided at a position corresponding to the overlapping portion 43, that is, at two places on one surface, and each of the overlapping portions 43 overlapping each other is detachably attached and detached. It is provided at one end 42 which is separated from the other piece 72 of the part 7 by a predetermined distance δ.

The handling operation of this will be described. First, as shown in FIG. 9, the other extension belt 4b is inserted into the insertion hole 25a of the belt insertion portion 25, is folded over the other piece 72 of the ring portion 7, and the detachable portion 44 is operated with one hand. Each of the overlapping portions 43 is fixed.

Next, as shown in FIG. 10, when the attaching / detaching portion 44 is operated to separate the overlapping portions 43 from each other and the locking stopper 41 is locked to the ring portion 7 on the other extension belt 4b,
The backrest 2 has a lower end 23 having a pair of upper frames 1a,
1b, the upper end portion 24 moves rearward while being curved by a dimension corresponding to the predetermined distance δ, and
a is formed between the pair of upper frames 1 a and 1 b and between the backrest 2.

Then, the other extension belt 4b is pulled by one hand to the locking stopper 41 by the predetermined distance δ toward the other upper frame 1b, and the attachment / detachment section 44 is operated to fix each of the overlapping sections 43. The backrest 2 moves forward and returns to the original state without the work space 2a.

In the wheelchair of the third embodiment,
As described above, the backrest portion 2 is provided with the one extension belt 4a and the other extension belt 4b extending to both sides of the upper end portion 24, respectively.
1 and the detachable portion 44 is
b is provided at a position corresponding to the overlapping portion 43, and each of the overlapping portions 43 overlapping each other is detachably attached and detached. Therefore, the attaching and detaching portion 44 is operated with one hand to separate the overlapping portions 43 from each other, and the backrest portion 2 By moving the upper end portion 24 backward, the working space 2a can be easily formed with one hand, and similarly, it can be returned to the original state with one hand.

Further, since the locking stopper 41 is provided at one end 42 of the other extension belt 4b separated from the other piece 72 of the ring portion 7 by a predetermined distance δ, the attaching / detaching portion 44 is operated to connect the overlapping portion 43 to each other. When the locking part 41 is separated and the locking stopper 41 is locked to the ring part 7, the upper end part 24 of the backrest part 2 moves rearward by a dimension corresponding to the predetermined distance δ, and the working space 2
a can be formed with high dimensional accuracy and the locking stopper 4
By pulling the backrest 1 toward the other upper frame 1b by a predetermined distance δ, the backrest 2 can be easily returned to the original state.

[0041]

According to the first aspect of the present invention, the backrest portion has a lower end portion and an upper end portion in contact with the lower portion of the back portion, the lower end portion is supported by the pair of upper frames, and the upper end portion is rearward. When the upper end of the backrest is moved rearward, a work space for washing the back of the care receiver is formed between the pair of upper frames and the backrest. The caregiver should easily care for the cared person's back in a stable posture using the formed work space while keeping the lower back in contact with the lower end of the backrest and maintaining a stable sitting position. Can be.

According to a second aspect of the present invention, in addition to the effects of the first aspect, both extension belts having a backrest extending to both sides of an upper end portion are provided, and each extension belt straddles the upper frame. One end was detachably attached to the other side of the backrest, so one end of each extended belt was removed from the other side of the backrest, and the upper end of the backrest was moved rearward, making it easier to work. Can be formed.

According to the third aspect, in addition to the effect of the second aspect, a belt insertion portion having an insertion hole is provided on the other surface side of the backrest portion, and the locking stopper is provided from the belt insertion portion. Since each extension belt is provided at one end of each extension belt separated by a predetermined distance, each extension belt inserted into the insertion hole of the belt insertion portion has one end removed from the other surface of the backrest portion, and each locking stopper is removed. When locked to the belt insertion section, the upper end of the backrest moves rearward by a dimension corresponding to the predetermined distance, allowing the working space to be formed with high dimensional accuracy and pulling each locking stopper toward the center by a predetermined distance. Thus, the backrest can be easily returned to the original state.

According to a fourth aspect of the present invention, in addition to the effect of the first aspect, a one extension belt and a second extension belt having a backrest extending to both sides of the upper end portion are provided.
One extension belt is fixed to one upper frame, and the other extension belt straddles the other upper frame and has one end detachably attached to the other surface of the backrest. Remove the backrest with one hand from the other side, move the upper end of the backrest backwards, easily form a work space with one hand, and attach one end to the other side and use the same backrest with one hand The part can be returned to its original state.

According to the fifth aspect, in addition to the effects of the fourth aspect, the belt insertion portion is provided on the other surface side of the backrest portion, and the locking stopper is separated from the belt insertion portion by a predetermined distance. Since the other extension belt is provided at one end of the extension belt, the other extension belt is detached at one end from the other surface of the backrest portion and the locking stopper is engaged with the belt insertion portion, so that the upper end portion of the backrest portion is at a predetermined distance. The working space can be formed with high dimensional accuracy by moving backward by the corresponding dimension, and the locking stopper can be pulled back to one upper frame side by a predetermined distance to easily return the backrest to the original state. .

According to a sixth aspect of the present invention, in addition to the effects of the first aspect, a one-sided belt and a second-sided belt are provided, the backrests of which extend to both sides of the upper end, respectively.
On the other hand, while the extension belt is connected to one piece of the ring part,
Since the detachable portion is provided at the position corresponding to the overlapping portion of the other extension belt, and each of the overlapping portions overlapping each other is detachably attached and detached, the detachable portion is operated with one hand to separate the overlapping portions from each other and the backrest portion is removed. By moving the upper end part backward, the working space can be easily formed with one hand, and similarly, it can be returned to the original state with one hand.

According to the seventh aspect, in addition to the effect of the sixth aspect, the locking stopper is provided at one end of the other extending belt at a predetermined distance from the other end of the ring portion. When the overlapping portion is separated from each other by operating the portion and the locking stopper is locked to the ring portion, the upper end portion of the backrest portion can move backward by a dimension corresponding to a predetermined distance, so that a working space can be formed with dimensional accuracy. At the same time, the locking stopper is pulled toward the other upper frame by a predetermined distance,
The backrest can be easily returned to the original state.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a conceptual diagram in a use state of the above.

FIG. 5 is a perspective view from the back in the use state of the above.

FIG. 6 is a perspective view from the side in the use state of the above.

FIG. 7 is a rear perspective view showing a second embodiment of the present invention.

FIG. 8 is a perspective view from the back in the use state of the above.

FIG. 9 is a perspective view from the back showing a third embodiment of the present invention.

FIG. 10 is a perspective view from the back in the use state of the above.

FIG. 11 is a side view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper frame 1a One upper frame 1b The other upper frame 11 Seat plate 2 Backrest part 21 One surface 22 Other surface 23 Lower end part 24 Upper end part 25 Belt insertion part 25a Insertion hole 3 Care receiver 31 Back part 31a Lower back part 4 Extension Belt 4a One extension belt 4b The other extension belt 41 Locking stopper δ Predetermined distance 42 One end 43 Overlapping part 44 Detachable part 7 Ring part 71 One piece 72 Other piece

Continuing from the front page (72) Inventor Sayumi Yoshida 1048 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. Inventor Teruhiko Egawa 1048 Kadoma Kadoma, Kadoma City, Osaka Pref. (72) Inventor Asako Ogawa 1048 Kadoma Kadoma, Kadoma City, Osaka Pref.

Claims (7)

[Claims] 1. A pair of upper frames provided with a seat plate and projecting upward from both sides of the seat plate, and a backrest provided between the pair of upper frames and one surface of which comes into contact with the back of the care receiver. In a wheelchair moving at least in the front-back direction, a lower end of the backrest abutting on a lower back of the back is supported by the pair of upper frames, and an upper end can be movably moved rearward. A wheelchair characterized by being formed as follows. 2. The backrest portion includes two extending belts extending to both sides of the upper end portion, and each of the extending belts is detachably attached at one end to the other surface across the upper frame. The wheelchair according to claim 1, characterized in that: 3. A belt insertion portion having an insertion hole is provided on the other surface side of the backrest portion, and each of the extension belts inserted through the insertion hole has a locking stopper which locks the belt insertion portion. 3. The wheelchair according to claim 2, wherein the wheelchair is provided at one end portion which is separated from the belt insertion portion by a predetermined distance. 4. The backrest portion includes one extension belt and the other extension belt extending to both sides of the upper end portion, wherein one extension belt is fixed to one upper frame and the other extension belt is fixed to the other upper frame. The wheelchair according to claim 1, wherein one end of the installation belt is detachably attached to the other surface across the other upper frame. 5. A belt insertion portion having an insertion hole is provided on the other surface side of the backrest portion, and the other extension belt inserted into the insertion hole has a locking stopper which locks the belt insertion portion. 5. The wheelchair according to claim 4, wherein the wheelchair is provided at one end portion separated from the belt insertion portion by a predetermined distance. 6. The backrest portion is provided with one extension belt and another extension belt extending to both sides of the upper end portion, and the one extension belt straddling one of the upper frames is formed in a ring shape. And the other extended belt straddling the upper frame of the other while being fixed to one piece of the ring portion having the one piece and the other piece opposing each other. The wheelchair according to claim 1, wherein a detachable portion for detachably attaching each of the detachable portions is provided at a position corresponding to the overlapping portion. 7. The other extension belt according to claim 6, wherein a locking stopper for locking to the ring portion is provided at one end portion separated from the other end of the ring portion by a predetermined distance. Wheelchair.