JP4730859B1 - wheelchair - Google Patents

Abstract

[PROBLEMS] To provide a wheelchair that can open a seating surface with a slight lift, can be used without moving or standing, and can greatly reduce the burden on the user and caregiver during excretion. Provided.
A support frame is arranged around a seating surface, a seat part is erected on the support frame, and the seat part is divided into a left seat part and a right seat part. The left seat portion 63 and the right seat portion 64 can be slid outward and upward to open the center of the two.
[Selection] Figure 1

Description

  The present invention relates to a wheelchair that can be used without getting on and off.

When a disabled person or sick person using a wheelchair adds work, he stands by holding a handrail near the toilet bowl, moves from the wheelchair to the toilet bowl, sits on the toilet seat, and then holds the handrail. It is common to sit down again in a wheelchair.
Such a transfer operation between a wheelchair and a toilet is not only a heavy burden for a handicapped person or a sick person, but also has a safety problem and often requires a caregiver.
However, there was a mental pain caused by calling a caregiver at midnight, etc., and it was hard work for a caregiver to get up and move a disabled or sick person.

Therefore, various wheelchairs that can be used while sitting on a seat have been proposed.
For example, in Non-Patent Document 1, there is a hole in the central part of the seating surface, and by making the hole in the seating surface coincide with the upper part of the toilet opening, it can be used while sitting on the seating surface. The wheelchair is listed.
Further, in Patent Document 1, a through hole is formed in the seat surface portion, and is supported rotatably on the left and right side frames, respectively, and in the state of being tilted and arranged, it is flush with the seat surface portion and closes the through hole. A wheelchair with a first closure member and a second closure member is described.

JP 2010-99158 A

TOTO Corporation, “Barrier-Free Product Catalog for Living”, April 2009, p.49

However, since the wheelchair described in Non-Patent Document 1 has a large hole for excretion formed in the seating surface, it is unstable and very uncomfortable when sitting, and is suitable for use in normal life and movement. Not.
In addition, since the wheelchair described in Patent Document 1 does not stand up from the seating surface, it cannot open and close the through hole by rotating the double-folded closing member, and thus movement between the wheelchair and the toilet is unnecessary. However, the burden of standing and sitting cannot be eliminated.
The present invention is a wheelchair that can open a seat with a slight lift, can be used without moving or standing, and can greatly reduce the burden on the user and caregiver during excretion The purpose is to provide.

The wheelchair according to the present invention includes a support frame disposed around a seating surface, and a seat portion erected on the support frame. The seat portion is divided into a left seat portion and a right seat portion, and the left The seat portion and the right seat portion are formed by connecting a plurality of plate members extending in the front-rear direction of the seat surface with a flexible sheet, and the left seat portion and the right seat portion are respectively opened to open the center of the support frame. It is possible to slide outward and upward.
The following configuration may be adopted.
A large-diameter main wheel is provided with a large-diameter main wheel and a small-diameter auxiliary wheel on both sides of the front portion of the base frame that supports the support frame, and is provided with a caster capable of changing direction on both sides of the rear portion of the base frame. A configuration with a hand rim attached to the outside.
In this case, the auxiliary wheel can be moved up and down between a position where the lower end is higher and lower than the lower end of the main wheel.
Further, the main wheel is provided on the outer side in the width direction than the auxiliary wheel and the caster, and the hand rim can be attached or detached, or can be brought into contact with or separated from the main wheel.
A configuration in which a driving device that drives the main wheel by a stepping operation is provided.

Structure in which a armrest portion freely raised or lowered on both sides of the front Symbol support frame.
A configuration in which an operation part is fixed to each of the left seat part and the outer part of the right seat part, and the operation part is attached to the armrest part so as to be movable up and down and fixed at an upper limit position and a lower limit position.
A configuration in which a backrest plate is erected on the rear side of the seat portion, and a leaf spring is provided on the support frame to support the backrest plate from behind.
The structure which enabled adjustment of the height of the said seat part.

According to the first aspect of the present invention, when excreting, the support frame is placed above the toilet seat with the wheelchair approaching the toilet, the waist is slightly lifted, and the left seat portion and the right seat portion are outwardly upward. By simply sliding, the center of the support frame opens greatly, so the user can sit directly on the toilet seat of the existing toilet bowl, and after excretion, the user can float slightly from the toilet seat and left Since the seat is closed again by pulling down the seat and the right seat, the user can sit down on the seat, so that the user does not have to stand up or move every time they excrete. And the burden on the caregiver can be greatly reduced.
Furthermore, the left seat and the right seat can be smoothly slid, and the strength of the seat is high, so that the user's body can be stably supported.

According to the second aspect of the present invention, even if a device such as a hot water jetting device is attached to the rear side surface of the toilet bowl, when the wheelchair is approached backwards, the large-diameter main wheel hits these appliances. Since there is no, proceed smoothly.
In addition, even in a narrow toilet, it can be easily aligned with the toilet bowl by a small-diameter auxiliary wheel.
According to the invention according to claim 3, when the direction change is required, the auxiliary wheel can be lowered and the wheelchair can be driven in place of the main wheel. Efficient traveling with the main wheel can be performed.

According to the invention which concerns on Claim 4, since the width | variety of the whole wheelchair can be narrowed by removing a hand rim or making it approach a main wheel, it can pass also at the entrance of a narrow toilet, etc.
According to the fifth aspect of the present invention, even a user who cannot use his / her hands can easily drive the main wheel by driving with his / her foot .

According to the invention which concerns on Claim 6 , it can move easily between a bed etc. and a wheelchair by defeating an armrest part and releasing the side of a seat surface.
According to the seventh aspect of the invention, it is possible to easily open the seat portion by operating the operation portion, and it is possible to prevent the seat portion from moving without intentional operation.
According to the invention which concerns on Claim 8 , since a leaf | plate spring receives a user's body from back via a backrest, there exists buffer property and a comfortability improves.
According to the invention which concerns on Claim 9 , the height of a seat part can be adjusted according to the height of a toilet bowl.

It is the top view which fractured | ruptured a part of wheelchair which shows Example 1 of this invention. It is the front view which fractured | ruptured a part of wheelchair which shows Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the wheelchair which shows Example 1 of this invention, (A) is the whole side view which fractured | ruptured one part, (B) is a principal part side view. BRIEF DESCRIPTION OF THE DRAWINGS It is a principal part perspective view of the wheelchair which shows Example 1 of this invention, (i) is the state which fell down one armrest part, and laid the seat part on the support frame, (b) raised the armrest part, The state which pulled up the part is shown. It is sectional drawing at the time of the auxiliary wheel raising of the auxiliary wheel raising / lowering mechanism part which concerns on Example 1. FIG. It is sectional drawing at the time of the auxiliary wheel descending of the auxiliary wheel raising / lowering mechanism part which concerns on Example 1. FIG. It is sectional drawing of a stepping drive device, a main wheel, and a hand rim. An armrest part and an operation part are shown, (a) is a partially broken side view, (b) is a bottom view of the main part, and (c) is a plan view of the main part. It is principal part sectional drawing of a front frame and a front raising / lowering frame. It is a sectional side view of the auxiliary wheel raising / lowering mechanism part which concerns on Example 2. FIG. It is a front sectional view of the auxiliary wheel lifting mechanism according to the first embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 9 show Example 1 of the present invention.
As shown in FIGS. 1 to 4, the wheelchair of the present embodiment has a base frame 1 whose upper surface is a rectangular seat surface, and a support that is supported by the base frame 1 and arranged around the seat surface. A frame 2, a seat 3 laid on the support frame 2, a large-diameter main wheel 4 and a small-diameter auxiliary wheel 5 provided on both sides of the front portion of the base frame 1, and the base frame 1 Casters 6 provided on both sides of the rear part.

The base frame 1 and the support frame 2 are constructed by assembling a high-strength material such as a metal pipe or L-shaped steel. The rear column 8 has a lower frame 9 that connects the lower ends of the front column 7 and the rear column 8.
The support frame 2 is disposed along the front edge of the seat surface, and is disposed along the rear frame 10 between the upper ends of the left and right front columns 7 and the rear edge of the seat surface. The rear frame 11 laid between the upper ends, and arranged along the side edge of the seating surface, the side frame 12 laid between the upper ends of the front column 7 and the rear column 8, and arranged in parallel with the front frame 10, A front lifting frame 13 having an inverted L-shaped cross section covering the upper surface and the front surface of the front frame 10.

As shown in FIG. 5, the front column 7 of the base frame 1 is hollow and has a lower surface opened, and a lower column 14 is slidably fitted inside the front column 7 through the lower surface. Further, a tread plate 15 is installed between the lower ends of the left and right lower columns 14, and auxiliary wheels 5 are mounted on both sides of the lower surface of the tread plate 15.
Further, one end of the first connection link 16 formed by axially attaching the ends of two short levers is axially attached to the upper end of the lower support column 14, and the other end of the first connection link 16 is the upper part of the inner surface of the front support column 7. It is attached to the shaft.
Furthermore, one end of the second connection link 17 formed by axially attaching the ends of the two long levers is axially attached to the intermediate connection portion of the first connection link 16, and the other end of the second axis attachment link 17 slides. It is pivotally attached to the plate 18.

A guide plate 19 is provided at the center of the front frame 10 downward, and a slide plate 18 is superimposed on the back surface of the guide plate 19 so as to be movable up and down.
In addition, a long hole 73 is formed in the guide plate 19 in the vertical direction, a male screw 74 penetrating the slide plate 18 is slidably inserted into the hole 73, and the operation knob 20 is screwed to the tip of the male screw 74. Yes.
Therefore, by tightening the operation knob 20, the front frame 10 can be sandwiched between the slide plate 18 and the operation knob 20 and the slide plate 18 can be fixed to the guide plate 19.
Further, between the front column 7 and the guide plate 19, the front frame 10 is provided with a weir plate 22 that hits the second connecting link 17 when the slide plate 18 descends and extends it straight.
In addition, a push spring 21 is interposed between the lower support 14 and the front support 7 to push up the lower support 14.

During normal traveling, as shown in FIG. 5, the slide plate 18 is fixed at the raised position, and the lower end of the auxiliary wheel 5 is also raised to the lower end of the main wheel 4, that is, the retracted position higher than the traveling surface L. Yes.
At this time, the operation knob 20 is tightened, the first connecting link 16 is bent so that the intermediate connecting portion faces inward, and the second connecting link 17 is also bent.
When the auxiliary wheel 5 is used, after the operation knob 20 is loosened, the tread plate 15 is lowered until the lower end of the main wheel 4 and the lower end of the auxiliary wheel 5 are at the same height. Then, the lower support column 14 attached to the tread plate 15 is lowered, the first connection link 16 connected to the lower support column 14 and the second connection link 17 connected to the first connection link 16 are gradually extended to form the second connection link. The slide plate 18 connected to 17 descends.

Further, when the operation knob 20 is pushed down with both hands, as shown in FIG. 6, the second connecting link 17 hits the barrier plate 22 and extends straight, and the first connecting link 16 pushed by the second connecting link 17 extends to assist. The wheel 5 is lowered to a position lower than the main wheel 4.
The first connecting link 16 once extends in a straight line and then slightly bends to the opposite side. However, the first connecting link 16 cannot be bent to a certain angle or more by hitting the front support 7 and is pushed upward by the push spring 21. Therefore, after extending linearly, it cannot be bent inward as before, and as a result, the auxiliary wheel 5 is locked in the lowered position.
In order to raise the auxiliary wheel 5, the operation knob 20 may be loosened and pulled up.
If there is not enough force to push down the operation knob 20, it can be pushed down easily by lifting the table A (see FIG. 3) under the main wheel 4 while lifting it.

As shown in FIGS. 3B and 7, the main wheel support arm 23 projects forward from the middle portion of the front column 7, and the shaft 24 of the main wheel 4 penetrates the upper portion of the main wheel support arm 23. The support shaft 25 passes through the lower portion of the main wheel support arm 23. The main wheel 4 is fitted to the shaft 24 so as to be rotatable and non-slidable.
A first sprocket 26 is fixed to the shaft 24, and a second sprocket 27 and a male cone coupling 29 fixed to the second sprocket 27 are rotatably and non-slidably fitted to the support shaft 25. Has been. The first sprocket 26 and the second sprocket 27 are connected by a chain 28.

Inside the male cone coupling 29, a female cone coupling 30 is rotatably fitted to the support shaft 25 so as to be able to contact with and separate from the male cone coupling 29.
A foot pedal 31 and a stopper 32 are attached to the female side corn coupling 30, and when the foot pedal 31 is depressed to the lower limit, the stopper 32 hits the foot plate 15 to stop the rotation of the female side corn coupling 30.
A cylinder 33 is provided inside the female cone coupling 30 so as to move in the axial direction in conjunction with the cylinder. The cylinder 33 is fitted to the support shaft 25 by a key 35 so as not to rotate.
Further, a torsion spring 34 is interposed between the cylinder 33 and the female cone coupling 30, and when the foot pedal 31 reaches the lower limit position and stops rotating, the torsion spring 34 is restored by the restoring force of the torsion spring 34. The pedal 31 returns to the original raised position.

A nut 36 is fixed to the inner end of the cylindrical body 33. The left and right nuts 36 are reverse screws, and screw rods 37 of right and left reverse screws are screwed onto the nuts 36 on both sides. A handle 38 for rotating operation is attached to an intermediate portion of the screw rod 37.
Accordingly, when the handle 38 is operated to rotate the screw rod 37, the left and right cylinders 33 move in the opposite axial direction, and the female cone coupling 30 that moves in the axial direction in conjunction with the cylinder 33 is the male. Engage / disengage with the side cone coupling 29.

When the female cone coupling 30 and the male cone coupling 29 are engaged, the force to depress the foot pedal 31 is transmitted to the main wheel 4 via the second sprocket 27, the chain 28, and the first sprocket 26. The main wheel 4 rotates in the forward direction.
A free wheel 39 is interposed between the shaft 24 and the first sprocket 26, and the rotational force when the foot pedal 31 is raised by the restoring force of the torsion spring 34 is not transmitted to the main wheel 4. The wheel 4 does not rotate in the backward direction.
Further, when the vehicle does not travel by stepping, the engagement between the female corn coupling 30 and the male corn coupling 29 is released, and the foot pedal 31 is lowered to be used as a footrest.

The main wheel 4 is disposed outside the auxiliary wheel 5 and the caster 6 in the width direction of the wheelchair. As shown in FIGS. 1, 2, and 7, the main wheel 4 is manually placed outside the main wheel 4. A hand rim 40 for driving is mounted.
The hand rim 40 is slightly smaller in diameter than the main wheel 4, and a plurality of protrusions 41 are formed at appropriate intervals on the inner side surface (the surface on the main wheel 4 side).
As shown in FIG. 7, a long hole 42 is formed in the protrusion 41 in the inner and outer direction (the width direction of the wheelchair), and the hand rim 40 is fixed to the inner peripheral surface of the main wheel 4 by a thumbscrew 43 inserted through the long hole 42. ing.
Therefore, when the thumbscrew 43 is loosened, the hand rim 40 can be moved toward and away from the main wheel 4, and the handrim 40 can be detached from the main wheel 4 by removing the thumbscrew 43.
Since the hand rim 40 is positioned on the outermost side of the wheelchair, the width of the entire wheelchair can be reduced by bringing the hand rim 40 close to or removed from the main wheel 4.

As shown in FIGS. 2, 3, and 4, the rear column 8 of the base frame 1 extends upward beyond the rear frame 11, and its upper end is bent rearward to form a grip portion 8 ′ for a caregiver. ing.
Further, above the rear frame 11, an upper receiving frame 44 integrated with the lower receiving frame 45 and the grip portion 8 ′ is installed between the left and right rear struts 8, and the upper receiving frame 44 and the lower receiving frame 45. A backrest plate 46 is attached to the front surface of the front panel so as to be inclined slightly so that the upper end side faces rearward.
In addition, a leaf spring 47 that supports the backrest plate 46 from behind is attached to the center portion of the rear frame 11.
It should be noted that it is more comfortable to use a back cushion on the front surface of the backrest plate 46.

As shown in FIG. 3, a caster 6 capable of changing its direction is attached to the rear end portion of the lower surface of the lower frame 9 of the base frame 1. The caster 6 can rotate 360 degrees in the horizontal direction, and a bolt 48 is erected on the upper surface thereof. The bolt 48 passes through the lower frame 9 and is screwed into a nut fixed to the upper surface of the lower frame 9.
Therefore, by rotating the bolt 48, the length from the lower frame 9 to the lower end of the caster 6 can be changed, and the height of the rear portion of the seat portion 3 can be adjusted.
A hand brake 49 is installed on the lower frame 9 so as to face the rear side of the main wheel 4. When the lever 50 of the hand brake 49 is pulled, the stopper 51 is pressed against the surface of the main wheel 4 to suppress the rotation of the main wheel 4. It is supposed to be.

As shown in FIG. 4, armrests 52 are installed on both sides of the support frame 2.
As shown in FIG. 8A, the armrest portion 52 is attached to the armrest support frame 75 laid between the end portions of the rear frame 11 and the front elevating frame 13, and the front and rear portions of the armrest support frame 75, respectively. It consists of an armrest support 53 and an armrest plate 54 installed between the upper ends of the armrest support 53.
A short pipe 55 is attached to the lower end of the armrest support 53, and the short pipe 55 is slidably and rotatably fitted to the armrest support frame 75.
The armrest support frame 75 is provided with a push spring 56 for urging the armrest strut 53 forward, and can be attached to and detached from the rear strut 8 at the rear end of the armrest plate 54 as shown in FIG. A hook 57 is provided to engage the.

When the hook 57 is engaged with the rear support column 8, the armrest support column 53 stands up and the elbow can be placed on the armrest plate 54.
On the other hand, when the push spring 56 is contracted and the hook 57 is removed from the rear column 8, the armrest column 53 and the armrest plate 54 can be tilted outward. For this reason, after the wheelchair is brought close to the bed and connected and fixed with a belt or the like, the armrest column 53 and the armrest plate 54 are tilted and bridged between the seat 3 and the bed, and the user sits between the wheelchair and the bed. It can be used as a bridge when moving while standing.

As shown in FIGS. 4 and 5, the front lifting frame 13 of the support frame 2 has an inverted L-shaped cross section, and long guide holes 58 are formed at both ends of the support frame 2.
Further, as shown in FIG. 9, at the positions corresponding to the guide holes 58 at both ends of the front frame 10, holes for fixing the nuts 59 are formed on the back side, and bolts protruding from the back surface of the fixing knob 60 are provided. It is threaded into the nut 59 through the guide hole 58.
By loosening the fixing knob 60, relatively moving the knob 60 and the guide hole 58 up and down, and tightening the fixing knob 60 again, the front lifting frame 13 can be adjusted to an appropriate height and fixed.

As shown in FIG. 1, the seat portion 3 is formed by connecting a plurality of plate members 61 extending in the front-rear direction of the seat surface with a flexible sheet 62 such as rubber, and the left seat portion 63 and the right seat portion at the center in the width direction. Divided into 64. In the present embodiment, the left seat portion 63 and the right seat portion 64 each have two plate members 61.
As shown in FIG. 4, an operation portion 65 is fixed to the outer end portions of the left seat portion 63 and the right seat portion 64, and the operation portion 65 is attached to the armrest column 53 of the armrest portion 52 so as to be movable up and down.
As shown in FIG. 8, the operation unit 65 includes a handle 66 fixed to the outer ends of the left seat 63 and the right seat 64, a pipe 67 attached along the upper edge of the handle 66, and an interior of the pipe 67. And a pin 68 disposed on the surface.

The handle 66 and the pin 68 can slide along the pipe 67, and a claw 69 is fixed to the front end portion of the pin 68. As shown in FIG. 8B, the claw 69 is slidably engaged with a slit 70 formed in the lower surface of the pipe 67 along the axial direction, and the lower end portion of the claw 69 faces the front end of the handle 66. It is out.
When the handle 66 is slid forward, the handle 66 pushes the claw 69 and the pin 68 slides forward in conjunction with the handle 66. In addition, a spring 71 that urges the handle 66 and the pin 68 toward one side in the front-rear direction (backward in the example shown in the drawing) is installed inside the pipe 67.
Both ends of the pipe 67 are fitted to the front and rear armrest columns 53 so as to be movable up and down, and the end portions of the pins 68 are inserted into the upper and lower ends of one armrest column 53 (rear in the example shown in the figure). A receiving hole 72 is formed.
When the pin 68 is inserted into the receiving hole 72, the operating portion 65 cannot be raised or lowered. However, if the handle 66 is moved to compress the spring 71 and the pin 68 is moved out of the receiving hole 72, the operating portion 65 is moved. 65 can be moved along the armrest column 53.

As shown in FIGS. 4A and 8, when the operation portion 65 is at the lower limit position and the pin 68 is inserted into the lower receiving hole 72, the left seat portion 63 and the right seat portion 64 are surfaces. They are laid on the support frame 2 side by side, and a plate material 61 is laid between the front elevating frame 13 and the rear frame 11.
As shown in FIG. 4B, when the operation portion 65 is at the upper limit position and the pin 68 is inserted into the upper receiving hole 72, the left seat portion 63 and the right seat connected to the operation portion 65 The part 64 slides outward and upward, and the center of the support frame 2 opens.

When using a wheelchair while riding in a wheelchair, the wheelchair is approached backwards in the toilet and the main wheel 4, auxiliary wheel 5 and casters 6 on both sides are arranged on both sides of the toilet, and the support frame 2 is placed on the toilet seat. Fit above
At this time, if it is difficult for the wheelchair to pass through the entrance of the toilet, the hand rim 40 is removed or the main wheel 4 is approached to reduce the width of the wheelchair.
When it is difficult to change the direction of the wheelchair in a narrow toilet, the auxiliary wheel 5 is lowered and the main wheel 4 is operated.

Next, the left and right operation portions 65 are alternately lifted while the waist is slightly floated alternately left and right, and the left seat portion 63 and the right seat portion 64 are slid outward and upward, and then the operation portion 65 is locked at the upper limit position. Then, the center of the support frame 2 opens, and the toilet seat of the toilet bowl appears. Therefore, the user can sit directly on the exposed toilet seat and add his / her work.
Further, when the user sits on the toilet seat, the weight of the user is not added to the wheelchair, so that the wheelchair can be easily moved to a position convenient for the toilet.
If the height of the seat 3 does not match the height of the toilet seat, the caster 6 is moved up and down by rotating the bolt 48 to adjust the height of the rear of the seat 3 and the front lifting frame 13 is raised and lowered. Let the height of the front part of the seat part 3 be adjusted. However, this adjustment should be set once according to the regular toilet at the time of initial use.

  After the stool, the lock by the pin 68 of the operation part 65 is released, the left seat part 63 and the right seat part 64 are alternately pulled down while the left and right hips are floated alternately, and the operation part 65 is locked at the lower limit position. Then, the left seat 63 and the right seat 64 are laid on the support frame 2 so as to form the seat 3, so that the user can sit on the seat 3 as it is. .

10 and 11 show a second embodiment of the present invention.
In this embodiment, the auxiliary wheel lifting mechanism is attached to the tread plate 15 instead of the lower support column 14.
A mounting fin 76 is erected on the upper surface side of the tread plate 15, and one end of the first connecting plate 77 is pivotally attached to the mounting fin 76, and one end of the second connecting plate 78 is connected to the other end of the first connecting plate 77. The part is pivotally attached.
The other end of the second connecting plate 78 is fixed to the lower part of the operation lever 79, and the lower part of the pipe 80 parallel to the upper end of the operation lever 79 is attached. The lower portion of the operation lever 79 is pivotally attached to the main wheel support arm 23 so as to be rotatable in the front-rear direction.

A shaft rod 82 is inserted into the pipe 80. The shaft rod 82 is urged upward by a push spring 83, and a knob 81 is attached to the upper end of the shaft rod 82.
In addition, a slider 84 is attached to the lower end of the shaft rod 82, and the tip of the slider 84 passes through the operation lever 79 and is fitted into a guide hole 85 formed in the main wheel support arm 23.
The guide hole 85 is formed along an arc centering on the pivoting portion between the operation lever 79 and the main wheel support arm 23, and notches extending upward are formed at both front and rear ends of the guide hole 85.

Normally (when traveling on the main wheel 4), the operation lever 79 and the pipe 80 are tilted forward, the second connecting plate 78 is inclined so that one end thereof is on the upper side, and the auxiliary wheel 5 is located below the lower end of the main wheel 4. Has also risen to a higher position.
At this time, since the slider 84 is engaged with the notch formed at the front end of the guide hole 85, the operation lever 79 and the pipe 80 cannot be rotated, and the auxiliary wheel 5 is locked in the raised position. Yes.

When the knob 81 is pushed to lower the shaft rod 82 and the slider 84 attached to the lower end thereof, the lock is released and the operation lever 79 and the pipe 80 can be rotated. Here, when the tread plate 15 is stepped down until the lower end of the auxiliary wheel 5 reaches the height of L (the same height as the lower end of the main wheel 4), the operation lever 79 moves to an intermediate point of the guide hole 85. Pull the operating lever 79 all the way to the front.
Then, the second connecting plate 78 is inclined so that one end thereof is downward, and the auxiliary wheel 5 is lowered below the main wheel 4. When the knob 81 is released, the slider 84 engages with the notch formed at the rear end of the guide hole 85 by the urging force of the push spring 83, and the auxiliary wheel 5 is locked at the lowered position.
In order to raise the auxiliary wheel 5 again, the knob 81 is pushed down and the operation lever 79 is tilted forward.

Further, in this embodiment, a stepping drive device for the main wheel 4 is not installed, a guide arm 86 extending forward is provided at the lower end of the main wheel support arm 23, and a footrest 87 is attached inside the guide arm 86.
The footrest 87 is attached to the guide arm 86 so as to be movable in the front-rear direction so that the position can be changed according to the length of the user's foot.
Since other configurations and methods of use are substantially the same as those of the first embodiment, common portions are denoted by the same reference numerals, and detailed description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Base frame 2 Support frame 3 Seat part 4 Main wheel 5 Auxiliary wheel 6 Caster 7 Front strut 8 Rear strut 8 'grip part 9 Lower frame 10 Front frame 11 Rear frame 12 Side frame 13 Front elevating frame 14 Lower strut 15 Stepping board 16 First connection link 17 Second connection link 18 Slide plate 19 Guide plate 20 Operation knob 21 Push spring 22 Dam plate 23 Main wheel support arm 24 Shaft 25 Support shaft 26 First sprocket 27 Second sprocket 28 Chain 29 Male side cone cup Ring 30 Female side cone coupling 31 Foot pedal 32 Stopper 33 Tubular body 34 Torsion spring 35 Key 36 Nut 37 Screw rod 38 Handle 39 Free wheel 40 Hand rim 41 Protrusion 42 Long hole 43 Butterfly screw 44 Upper receiving frame 45 Lower receiving frame 46 Back plate 47 Leaf spring 4 Bolt 49 Hand brake 50 Lever 51 Latch 52 Armrest 53 Armrest strut 54 Armrest plate 55 Short pipe 56 Push spring 57 Hook 58 Guide hole 59 Nut 60 Fixing knob 61 Plate material 62 Flexible seat 63 Left seat 64 Right seat 65 Operating portion 66 Handle 67 Pipe 68 Pin 69 Claw 70 Slit 71 Spring 72 Receiving hole 73 Hole 74 Male screw 75 Armrest support frame 76 Mounting fin 77 First connecting plate 78 Second connecting plate 79 Operation lever 80 Pipe 81 Knob 82 Shaft bar 83 Pressing spring 84 Slider 85 Guide hole 86 Guide arm 87 Footrest

Claims (9)

A support frame is arranged around the seating surface, and a seat is installed on the support frame, the seat is divided into a left seat and a right seat, and the left seat and the right seat are: A plurality of plate members extending in the front-rear direction of the seating surface are connected by a flexible sheet, and the left seat portion and the right seat portion can be slid outward and upward to open the center of the support frame. Characteristic wheelchair.   A large-diameter main wheel and a small-diameter auxiliary wheel are respectively provided on both sides of the front portion of the base frame that supports the support frame, and direction-changing casters are provided on both sides of the rear portion of the base frame, respectively. The wheelchair according to claim 1, wherein a hand rim is attached to the outside of the wheel.   The wheelchair according to claim 2, wherein the auxiliary wheel can move up and down between a position where a lower end thereof is higher than a lower end of the main wheel and a lower position.   The wheelchair according to claim 2 or 3, wherein the main wheel is provided on the outer side in the width direction than the auxiliary wheel and the caster, and the hand rim is detachably attached or detachably attached to the main wheel.   The wheelchair according to any one of claims 2 to 4, further comprising a drive device that drives the main wheel by a stepping operation. The wheelchair according to any one of claims 1 to 5, wherein armrests are provided on both side portions of the support frame so as to be freely raised and lowered. The operation part is fixed to each of the outer parts of the left seat part and the right seat part, and the operation part is attached to the armrest part so as to be movable up and down and fixed at an upper limit position and a lower limit position. Wheelchair. The wheelchair according to any one of claims 1 to 7, wherein a backrest plate is erected on the rear side of the seat portion, and a leaf spring for supporting the backrest plate from the rear side is provided on the support frame. The wheelchair in any one of Claims 1-8 which enabled adjustment of the height of the said seat part.

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