JP4546406B2 - Folding wheelchair seat structure - Google Patents

Description

  The present invention relates to a foldable wheelchair in which a backrest seat and a seat surface seat are divided, and in particular, an outwardly facing bulge portion is formed at a central portion on the lower end side of the backrest seat, and a lower surface side of the bulge portion is disposed on an upper surface of a guide belt The present invention relates to a seat structure for a foldable wheelchair that prevents the seat back from being folded toward the seat surface when the wheelchair is folded, so that the wheelchair can be folded smoothly. .

Folding wheelchairs are divided into an integral type in which the lower end of the seat back and the rear end of the seat are continuous, and a split type in which the lower end of the seat back and the rear end of the seat are separated. is there.
The folding wheelchair is folded into a mountain shape with the center of the seat seat facing upward when folded, but the integrated type has a backrest seat and a seat seat that are more continuous than the split type. The backrest seat side is easily pulled into the seat surface side by being dragged by folding, and as a result, the wheelchair cannot be folded smoothly, and there is an inconvenience that it is necessary to start again.
JP-A-2005-118144

  The backrest seat is made of a flexible and light material for weight reduction, so even in the case of split-type folding wheelchairs, sometimes the seatback seats are swung up when the wheelchair is folded. As a result, it could not be folded smoothly and had to be retried again.

  The present invention has been devised in view of the problems as described above, and has been devised to solve the problems. The object of the present invention is a foldable wheelchair in which a backrest seat and a seat surface seat are divided. By forming an outwardly bulging part at the center of the lower end side of the body and attaching the lower surface side of the bulging part to the upper surface side of the guide belt, it is possible to prevent the backrest seat from being seated on the seat surface side when the wheelchair is folded. An object of the present invention is to provide a seat structure for a foldable wheelchair that can be folded smoothly in an outward direction on the opposite side of the seat surface and can be folded smoothly.

In order to achieve the above object, the present invention relates to a folding wheelchair in which a backrest seat and a seating surface seat are divided, and the backrest seat is a portion where the lower end side of the backrest seat and the rearward extension side of the seating seat intersect. The bulge on which the part of the buttocks seated on the seating seat gets on the lower end side of the seat, and the projection gradually decreases from the central part toward the left and right ends and projects outwardly on the side opposite to the seating seat side. The seat belt is stretched between the left and right side frames positioned behind the seat seat of the side frame extending rearward from the left and right sides of the seat seat on the lower surface side of the bulge portion, and the backrest seat It comprises means attached to the upper surface side of the guide belt, which is bent downward by its own weight when the lower surface side of the bulging portion is folded , via a hook-and-loop fastener.
Here, the backrest sheet is divided into upper and lower parts, and the protrusion gradually decreases from the central part toward the left and right end sides from the lowermost side of the lowermost divided lowermost backrest sheet, and on the side opposite to the seat surface sheet side. What formed the bulging part which protrudes outward may be sufficient.

As is clear from the above description, according to the seat structure of the folding wheelchair according to the present invention, in the folding wheelchair in which the backrest seat and the seating seat are divided, the seating seat is provided at the center side on the lower end side of the seating backrest. By forming the outwardly bulging portion opposite to the side, the backrest seat can be easily folded outward when the wheelchair is folded.
On the other hand, since the backrest seat is made of a flexible and lightweight material, it is still possible to squeeze into the seat surface when folding the wheelchair. However, the lower side of the bulge part of the backrest seat is attached to the upper side of the guide belt stretched between the left and right frames, and the guide belt usually bends downward when the wheelchair is folded, so the bulge part of the backrest seat The lower surface side of the seat is pulled downward by the guide belt that bends downward and moves downward, and the front end side of the bulge portion of the backrest seat is prevented from moving to the front seat surface seat and is inserted into the seat surface seat side. Can be prevented. Thereby, at the time of folding of a wheelchair, a backrest sheet | seat can be reliably bend | folded outward by the outward bulge part.
Also, if the guide belt bends upward rarely when folding the wheelchair, the guide belt that bends upward may be in the way, preventing the backrest seat from bending inward toward the front seat surface. it can.
In this manner, in the folding wheelchair in which the backrest seat and the seat surface seat are divided, the protrusion gradually decreases from the central portion toward the left and right ends on the lower end side of the backrest seat, and on the side opposite to the seat surface seat side. A bulging portion that protrudes outward is formed, a guide belt is stretched between the left and right frames behind the seating seat on the lower surface side of the bulging portion, and the lower surface side of the bulging portion of the backrest seat is the upper surface of the guide belt. By attaching to the side via a hook-and-loop fastener, the backrest seat is prevented from being pushed into the seat surface when the wheelchair is folded, and the wheelchair can be reliably folded outwardly from the seat surface. Can be folded smoothly.

Hereinafter, the present invention will be described more specifically based on the best mode for carrying out the invention described in the drawings.
Here, FIG. 1 is a partial perspective view of a backrest seat and a seat surface seat of a folding wheelchair, FIG. 2 is a partial perspective view of a backrest seat and a seat seat of the folding wheelchair during folding, and FIG. 3 is a top view of the folding wheelchair. 4 is a partial perspective view of the lower backrest seat and the seating seat, FIG. 4 is a partial perspective view of the lowermost backrest seat and the seating seat of the folding wheelchair at the time of folding, and FIG. 5 is the lowermost backrest seat and the backrest seat of the folding wheelchair. FIG. 6 is a partial sectional view of a bulge portion formed on the lowermost backrest seat or the backrest seat, and FIG. 7 is a side view of the folding wheelchair before attaching the lowermost backrest seat or the backrest seat. FIG.

  In the figure, the foldable wheelchair 1 is composed of a backrest seat 2 and a seat surface seat 3 that are divided. That is, the lower end of the backrest sheet 2 and the rear end of the seating sheet 3 are not connected. Main wheels 5 are rotatably supported on the outer sides of the left and right side frames 4, and auxiliary wheels 51 are attached to the front sides of the left and right side frames 4, respectively. In addition, footrests 52 for footrests are attached to the front side of the left and right side frames 4.

  On the rear side of the left and right side frames 4, back frames 6 are respectively attached upward. The back frame 6 is attached in a state of being slightly inclined toward the rear. The upper sides of the left and right back frames 6 are bent horizontally toward the rear and a handle 61 is attached. The left and right handle 61 is a place where a caregiver grasps with his / her hand when operating the folding wheelchair 1.

  Armrests 41 are respectively provided above the left and right side frames 4. The left and right armrests 41 are supported by, for example, armrest support frames 42 attached between the side frame 4 and the back frame 6.

  Between the left and right side frames 4 below the seat surface sheet 3, cross expansion / contraction frames 7 having a structure in which the folding wheelchair 1 can be folded in the left-right direction are attached to each other with a gap in the front-rear direction. The cross expansion / contraction frame 7 intersects with a pair of frames inclined in an X shape, and its intersection is pivotally connected. The cross expansion / contraction frame 7 is expanded / contracted by expanding / contracting in the left / right width direction centering on the intersection, and the cross expansion / contraction frame 7 is foldable by narrowing the interval between the left and right side frames 4 to which the upper and lower ends are pivoted. The wheelchair 1 can be folded.

  For example, the lower end of one inclined frame of the cross expansion / contraction frame 7 is rotatably pivoted to the lower end side of the left side frame 4, and the upper end is pivotally pivoted to the upper side of the right lifting frame 71. . The lower end of the other frame that intersects with this is pivotally connected to the lower end side of the right side frame 4, and the upper end is pivotally connected to the upper side of the left lifting frame 71.

  The seat sheet 3 is attached between the upper parts of the left and right lifting frames 71. That is, the left end side of the seating sheet 3 is fixedly attached to the upper part of the left lifting frame 71. Similarly, the right end side of the seat surface sheet 3 is fixedly attached to the upper portion of the right lifting frame 71.

  When the folding wheelchair 1 is folded, the seat surface sheet 3 is bent into a mountain shape with the left and right centers facing upward. This is because if the sheet is bent downward, a part of the seat surface sheet 3 is sandwiched between the lower cross expansion / contraction frames 7 and inconvenience occurs.

  The backrest seat 2 is attached between the left and right upward back frames 6 behind the seat surface seat 3. That is, the left end side of the backrest seat 2 is attached to the left back frame 6, and similarly, the right end side of the backrest seat 2 is attached to the right back frame 6.

  Since the backrest sheet 2 may be replaced as appropriate, both end sides of the backrest sheet 2 may be temporarily attached to the left and right back frame 6 with clips or the like, and may be easily removed and easily replaced. In the case of a backrest seat 2 that is not scheduled to be replaced, it is fixedly attached to the left and right back frame 6.

  The backrest sheet 2 is formed with a bulge portion 21 that gradually decreases from the center portion toward the left and right ends and protrudes outward on the opposite side of the seat surface sheet 3 on the lower end side of the backrest sheet 2. The central portion of the bulging portion 21 has the largest protrusion toward the outside, and gradually decreases toward the left and right ends.

  The backrest sheet 2 may be divided into upper and lower parts as necessary. The upper and lower divisions may be divided into two or more. In the case of division, the bulging portion 21 is formed on the lowermost backrest sheet 2a which is the lowest portion. The bulging portion 21 is not formed on the upper backrest sheet 2b on the upper side of the lowermost backrest sheet 2a.

  The bulging part 21 is a lower end side of the backrest sheet 2 or the lowermost backrest sheet 2a when the backrest sheet 2 that is not divided vertically or the lowermost backrest sheet 2a that is divided vertically is viewed from the back side, that is, the rear side. Is projected and bulged toward the outside, that is, the rear side. Conversely, when the backrest sheet 2 or the lowermost backrest sheet 2a is viewed from the front side, that is, the seat surface sheet 3 side, the bulging portion 21 is such that the lower end side of the backrest sheet 2 or the lowermost backrest sheet 2a faces the other side. It has become recessed.

  A normal backrest sheet is flat when the left and right ends are pulled, but the bulging portion 21 on the lower end side of the backrest sheet 2 or the lowermost backrest sheet 2a of the present application is a three-dimensional curved surface. That is, the bulging portion 21 on the lower end side of the backrest sheet 2 or the lowermost backrest sheet 2 a is bent in a convex shape toward the outer side opposite to the seat surface sheet 3. In other words, the bulging portion 21 on the lower end side of the backrest sheet 2 or the lowermost backrest sheet 2 a is bent concavely toward the seat surface sheet 3.

  A guide belt 8 is stretched on the lower surface side of the bulging portion 21 on the lower end side of the backrest sheet 2 not vertically divided or the lowermost backrest sheet 2a divided vertically. The guide belt 8 adheres to the bulging portion 21 to prevent the backrest seat 2 or the lowermost backrest seat 2a from being folded toward the seat surface seat 3 when the foldable wheelchair 1 is folded. It fulfills the function of guiding.

  The left and right ends of the guide belt 8 are attached to the left and right side frames 4 behind the seat surface sheet 3. The guide belt 8 is attached in a stretched state between the left and right side frames 4 when the folding wheelchair 1 is used, that is, when the folding wheelchair 1 is not folded. That is, the guide belt 8 is stretched between the left and right side frames 4.

  Further, the stretched guide belt 8 has a swelled portion 21 of the backrest seat 2 in which a part of the buttocks seated on the seat surface sheet 3 is not divided vertically, for example, or the lowermost backrest seat 2a divided vertically. When riding, the bulging portion 21 of the backrest seat 2 or the lowermost backrest seat 2a is supported and supported from below.

The guide belt 8 always adheres to the bulging portion 21 of the backrest seat 2 or the lowermost backrest seat 2a, so that the backrest seat 2 or the lowermost backrest seat 2a is not folded toward the seat surface seat 3 when the folding wheelchair 1 is folded. In addition, a hook-and-loop fastener 81 is attached between the upper bulging portion 21 and the lower guide belt 8 so that they are always attached. That is, the lower surface side of the bulging portion 21 of the backrest sheet 2 or the lowermost backrest sheet 2a is attached to the upper surface side of the guide belt 8 via the hook-and-loop fastener 81 and is not easily detached. It can be forcibly separated during replacement.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
When the folding wheelchair 1 starts to be folded, the interval between the left and right side frames 4 starts to gradually narrow, and the seat surface sheet 3 begins to bend upward from the left and right center. When the interval between the left and right side frames 4 starts to narrow, the guide belt 8 stretched between the left and right side frames 4 also starts to loosen.

  The guide belt 8 usually starts to bend downward due to its own weight. Since the upper surface side of the guide belt 8 is attached to the lower surface side of the bulging portion 21 of the backrest sheet 2 that is not divided into the upper and lower sides of the upper side of the guide belt 8 or the lowermost backrest sheet 2a that is divided up and down, When the guide belt 8 starts to bend downward, the bulging portion 21 of the backrest sheet 2 or the center of the lowermost backrest sheet 2a is attracted by the downwardly bent guide belt 8 and moves downward.

  The backrest sheet 2 or the lowermost backrest sheet 2a behind the seat surface sheet 3 is bent in the vertical direction at the center of the backrest sheet 2 or the lowermost backrest sheet 2a by the downward movement of the bulge portion 21 on the lower end side. The center line will be formed naturally. In addition, since the central front end of the bulging portion 21 that moves downward is inclined downward from the horizontal state, the bulging portion 21 is tilted downward from the front ends of the left and right ends of the bulging portion 21 and moves slightly rearward.

  That is, the imaginary folding center line connecting the folding center at the left and right center of the backrest sheet 2 or the lowermost backrest sheet 2a is slightly rearward from the left and right ends of the backrest sheet 2 or the lowermost backrest sheet 2a. As the V-shaped bending toward the head is gradually formed and expanded, the backrest sheet 2 or the lowermost backrest sheet 2a is bent toward the rear rear side, and the backrest sheet 2 or the lowermost backrest sheet 2a is It is prevented from being bent toward the front seat surface sheet 3 side.

  The guide belt 8 usually bends downward by its own weight when the folding wheelchair 1 is folded, but it may be rarely bent upward. In this case, the backrest seat 2 or the lowermost backrest seat 2a is moved forward in order to prevent the guide belt 8 bent upward from obstructing the movement of the bulging portion 21 of the backrest seat 2 or the lowermost backrest seat 2a. Cannot be bent inwardly toward the seat surface sheet 3 side, bends outward on the opposite side of the seat surface sheet 3, and the backrest seat 2 or the lowermost backrest seat 2a faces the front seat surface 3 side. To prevent it from being bent.

  Thus, since the backrest sheet 2 or the lowermost backrest sheet 2a is reliably folded outwardly on the opposite side to the seat surface sheet 3, the folding operation is again performed by folding the backrest sheet 2 to the seat surface sheet 3 side. Therefore, the folding wheelchair 1 can be smoothly folded.

Note that the present invention is not limited to the best mode for carrying out the invention, and various modifications can be made without departing from the spirit of the invention.

1 is a partial perspective view of a backrest seat and a seat surface seat of a folding wheelchair showing the best mode for carrying out the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view of a backrest seat and a seating surface seat of a folding wheelchair during folding showing the best mode for carrying out the present invention. 1 is a partial perspective view of a lowermost backrest seat and a seat surface seat of a folding wheelchair showing the best mode for carrying out the present invention. It is a fragmentary perspective view of the lowermost backrest seat of the folding type wheelchair at the time of folding which shows the best form for carrying out this invention, and a seat surface sheet. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view of a folding wheelchair showing a best mode for carrying out the present invention when a lowermost backrest seat and a backrest seat are not mounted. It is a fragmentary sectional view of the bulge part formed in the lowermost backrest sheet | seat or the backrest sheet | seat which shows the best form for implementing this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a folding wheelchair showing a best mode for carrying out the present invention before a lower backrest seat or a backrest seat is attached.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Folding type wheelchair 2 Backrest seat 2a Lowermost backrest seat 2b Upper backrest seat 21 Inflated part 3 Seat surface sheet 4 Side frame 41 Armrest 42 Armrest support frame 5 Main wheel 51 Auxiliary wheel 52 Footrest 6 Back frame 61 Handle expansion frame 71 Lifting frame 8 Guide belt 81 Hook and loop fastener

Claims (2)

In the back sheet and the seating surface sheet divided collapsible wheelchair, the lower end of the backrest seat a lower end and the seat surface rear extension side and intersect portions of the sheet of the back sheet, the left and right end side from the central portion The protrusion gradually becomes smaller and protrudes outwardly on the opposite side of the seat surface, and forms a bulge where a part of the buttocks seated on the seat lies, and a guide belt on the lower surface side of the bulge Is stretched between the left and right side frames located behind the seat on the side frame that extends rearward from the left and right sides of the seat, and the lower surface of the bulge portion of the backrest seat is lowered by its own weight when folded. A seat structure for a folding wheelchair, wherein the seat belt is attached to the upper surface side of the guide belt to bend through a hook-and-loop fastener. The backrest sheet is divided into upper and lower parts, and the protrusion gradually decreases from the central part toward the left and right end sides on the lower end side of the lowermost divided lowermost backrest sheet, and outwards on the opposite side to the seat surface sheet side. The seat structure of the folding wheelchair according to claim 1, wherein a protruding bulge portion is formed.

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