JP2006000278A - Wheelchair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheelchair capable of assisting the standup motion of a user with a simple mechanism. <P>SOLUTION: A seat frame 11 is arranged between two body frames 10 of a seat 2. The seat frame 11 is rotatable around a pivot 12. One end section of a crank member 30 is connected to a pivot 21 of a backrest frame 20 of a backrest section 3, and the other end section of the crank member 30 is connected to a bracket 33 arranged below the seat frame 11 via a seat connecting arm 31. The bracket 33 is rotatable around a pivot 35. A roller 36 for supporting the seat frame 11 is mounted on the bracket 33. When the backrest frame 20 stands up, a tip section 20a pushes the crank member 30 backward to move the seat connecting arm 31, the crank member 33 is rotated, and the roller 36 pushes up the rear side of the seat frame 11. As a result, the seat 2 inclines simultaneously with an inclining movement of the backrest section 3 to assist the standup motion of the user. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wheelchair that assists a user in standing up.

  For example, a wheelchair used by a care recipient such as an elderly person is usually provided with a seat portion on which a user sits and a backrest portion on which the user leans, so that the user can move in a relaxed state.

  By the way, when a user of a wheelchair performs rehabilitation or moves from a wheelchair to a bed or the like, the user needs to get up from the wheelchair. In such cases, it is often difficult for the user to stand up on their own, and caregiver assistance is required. From this point of view, it is convenient that the wheelchair has a function to assist the user in standing up in order to help the user to stand up by himself and to reduce the burden on the caregiver.

  As a wheelchair having a function of assisting the standing up motion, for example, an airbag provided under the seating portion, and the seating portion is inclined by inflating and contracting the airbag to assist the rising motion of the user is proposed. (For example, see Patent Documents 1 and 2.)

  However, in such a case, in addition to the usual parts such as the seat and backrest of the wheelchair, the wheelchair includes an air supply / exhaust system for inflating and contracting an air bag such as an air bag, an air pump, and an air pipe, and its air supply / exhaust system. It is necessary to provide a control unit. For this reason, the wheelchair became larger and heavier, and the mobility and convenience of the wheelchair were reduced. In addition, the structure of the entire wheelchair has become complicated, the production cost of the wheelchair has increased, and the wheelchair has become relatively expensive.

JP 2002-78742 A JP 2002-65749 A

  The present invention has been made in view of such points, and an object of the present invention is to provide a wheelchair that can assist a user in standing up with a simpler mechanism.

  In order to achieve the above object, according to the present invention, a seat, a backrest that tilts between a standing posture and a rearward tilting posture, and a tilting operation from the rearward tilting posture to the standing posture of the backrest portion are linked. Thus, a wheelchair is provided, comprising: a seat tilting mechanism that tilts the seat so that the rear side of the seat rises from a horizontal state.

  According to the present invention, the seat portion is tilted in conjunction with the tilting motion of the backrest portion, so that it is not necessary to attach many members such as an air pump to the wheelchair as in the prior art. It can assist the user to stand up.

  The seat portion tilting mechanism may tilt the seat portion when the backrest portion stands more than a predetermined angle. In such a case, although the user's back is pushed by the standing backrest part, the seat part is inclined forward and downward, so that the user can be more suitably assisted.

  The seat tilt mechanism includes a seat connecting arm that is movable in the front-rear direction of the vehicle body in conjunction with a tilting operation of the backrest, and a pivot that is moved by the movement of the seat connecting arm to move the rear side of the seat. And a rotating member to be pushed up.

  A rotatable roller may be attached to a contact portion between the rotating member and the seat portion. In this case, the seat can be pushed up smoothly by the rotating member.

  The backrest portion may include a backrest frame that swings about a support shaft during a tilting operation, and the seat connecting arm may be movable in the front-rear direction by swinging the backrest frame. The wheelchair further includes a crank member rotatably attached to a support shaft of the back frame, and the crank member is supported by the back frame when the back frame swings more than a specific angle. The seat connecting arm may be connected to the crank member and moved in the front-rear direction by rotation of the crank member by the back frame.

  The wheelchair is connected to the front side of the leg resting portion in conjunction with a leg resting portion formed from the seat portion toward a forward depression direction and a tilting operation of the backrest portion from a standing posture to a rearward tilting posture. And a leg rest part pushing-up mechanism for pushing up the leg. In such a case, when the backrest part moves to the backward tilted position, the front side of the leg rest part is pushed up, and the wheelchair becomes a bed, so that the user can lie on the wheelchair. Therefore, the wheelchair can be used as a bed. Further, for example, the user can smoothly move from the bed to the wheelchair and from the wheelchair to the bed.

  The leg rest part push-up mechanism includes a leg rest part connecting arm that moves in the front-rear direction in conjunction with a tilting operation of the backrest part, and a pivot that is moved by the movement of the leg rest part connecting arm to move the leg rest part from below. And a push-up member that pushes up.

  The wheelchair may further include an armrest portion attached to the backrest portion and a horizontal maintenance mechanism that maintains the armrest portion horizontally regardless of an inclination angle of the backrest portion. In such a case, the armrest can be kept horizontal even if the inclination angle of the backrest is changed, so that the user can put the elbow on the armrest at any position and use the wheelchair in a relaxed state. .

  The horizontal maintaining mechanism may maintain the armrest portion horizontally using a parallel crank mechanism.

  The backrest portion has a backrest frame that swings with respect to a base of a vehicle body, and the horizontal maintenance mechanism supports the armrest portion, and a horizontal shaft that penetrates the backrest frame rotatably from the side; A crank arm swingably attached to the base so as to swing in parallel with a back frame, and a connecting member connecting the horizontal shaft and the crank arm, the connecting member comprising: The backrest frame and the crank arm may be kept horizontal regardless of the swing angle of the crank arm.

  The horizontal axis is connected to the connecting member so as to be rotatable about the axis, and the armrest portion is rotatable to the connecting member together with the horizontal axis, and the horizontal axis is rotated together with the horizontal axis. A rotating member that attaches to the horizontal shaft so that the armrest comes into contact with the connecting member and stops rotating when the armrest is lowered from a standing posture to a horizontal posture. It may be. In such a case, the armrest portion can be moved to a standing posture as necessary, and when in a horizontal posture, the armrest portion can be maintained in a horizontal state regardless of the inclination angle of the backrest portion.

  The wheelchair includes a first connection arm that connects the front wheel disposed on the front side of the vehicle body and the seat portion, and a second connection that connects the rear wheel disposed on the rear side of the vehicle body and the seat portion. An arm, and one end of the first connecting arm and the second connecting arm is rotatably attached to the seat, and the front and rear wheels rotate with respect to the seat. The position of the seat portion may be lowered by increasing the interval between the wheels, and the position of the seat portion may be increased by reducing the interval between the wheels. In such a case, the user can sit at a desired height by adjusting the height of the seat.

  ADVANTAGE OF THE INVENTION According to this invention, a user's standup can be assisted while ensuring the mobility and convenience of a wheelchair. Moreover, the production cost of such a wheelchair can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 is a perspective view of a wheelchair 1 according to the present embodiment.

  The wheelchair 1 according to the present invention is mainly composed of a seat portion 2, a backrest portion 3, a leg rest portion 4, an armrest portion 5, and a moving mechanism 6. The wheelchair 1 includes a normal function as a wheelchair such as a traveling function, a stand-up assist function in which the rear side of the seat 2 moves up and down in conjunction with the tilting motion of the backrest 3, and a tilting motion of the backrest 3. In conjunction with this, a bet function in which the front side of the leg rest portion 4 moves up and down and an armrest horizontal maintaining function for maintaining the armrest portion 5 horizontally are provided. Hereinafter, the structure of the wheelchair 1 for implement | achieving these functions is demonstrated.

  First, the stand-up assist function of the wheelchair 1 will be described. FIG. 2 is a perspective view showing an outline of the skeleton of the wheelchair 1 for realizing the function of assisting to stand up.

  On both the left and right sides of the seat portion 2, a body frame 10 is provided as a substantially rectangular parallelepiped plate-like base. Between these body frames 10, for example, a substantially U-shaped seat frame 11 is arranged. The seat frame 11 is arranged substantially horizontally so that the U-shaped opening side is in front of the vehicle body. Both end portions on the opening side of the seat frame 11 are rotatably attached to the inside of each body frame 10 by, for example, a support shaft 12.

  A substantially U-shaped backrest frame 20 is disposed on the backrest 3. Both ends of the backrest frame 20 on the opening side are connected to the vehicle body frame 10 by pivots 21 so as to be swingable. Thereby, the backrest part 3 can tilt with respect to the vehicle body frame 10. The tip portions 20a at both ends of the backrest frame 20 are refracted at a predetermined acute angle toward the rear side of the vehicle body, and the support shaft 21 is provided in the vicinity of the refracting portion.

  One end of a crank member 30 is rotatably connected to the support shaft 21. As shown in FIG. 3, the crank member 30 is formed with a pressing plate 30a that comes into contact with and presses the distal end portion 20a when the distal end portion 20a of the backrest frame 20 rotates rearward. One end of a seat connecting arm 31 that is long in the front-rear direction of the vehicle body is rotatably connected to the other end of the crank member 30 by a support shaft 32. The other end of the seat connecting arm 31 is rotatably connected by a support shaft 34 to a bracket 33 as a substantially triangular rotating member. The bracket 33 is rotatably attached to the body frame 10 by a support shaft 35 disposed above the support shaft 34. When the crank member 30 is pushed by the front end portion 20a of the back frame 20 and rotates rearward, and the seat connecting arm 31 moves rearward, the bracket 33 can rotate about the support shaft 35.

  The bracket 33 is provided with a roller 36 that supports the lower surface on the rear side of the seat frame 11. The roller 36 is rotatable with respect to the bracket 33 by a support shaft 37. The roller 36 rises when the bracket 33 rotates, and can push up the rear side of the seat frame 11 while rotating.

  For example, the length of the seat connecting arm 31 is such that when the inclination angle (backward inclination angle with respect to the vertical direction) of the backrest frame 20 becomes a predetermined angle θ (shown in FIG. 4), for example, 20 ° or less, It is set to push the pressing plate 30a of the crank member 30 and rotate the crank member 30 rearward. With this configuration, when the backrest 3 tilts from the rearward tilting posture to the standing posture and rises by a predetermined angle θ or more, the distal end portion 20a pushes the crank member 30 rearward, and the seat connecting arm 31 moves rearward. As shown in FIG. 4, the bracket 33 rotates and the rear side of the seat portion 2 is pushed up by the roller 36. Thereby, the seat part 2 inclines so that a back side may become high, and can assist a user's standing-up action. The backrest frame 20 can be swung at a desired angle by an electric drive unit (not shown), for example. In the present embodiment, for example, the crank member 30, the seat connecting arm 31, the blanket 33, and the roller 36 constitute a seat tilting mechanism.

  Next, the betting function of the wheelchair 1 will be described. FIG. 5 is a perspective view showing an outline of the skeleton of the wheelchair 1 for realizing this betting function.

  A substantially U-shaped leg mounting frame 50 formed from the seat portion 2 toward the front depression direction is disposed on the leg mounting portion 4. Both ends of the leg mounting frame 50 are rotatably connected to the vehicle body frame 10 by a support shaft 51.

  For example, one end portion of a leg resting portion connecting arm 53 is rotatably connected to the support shaft 52 provided at the distal end portion 20a of the backrest frame 20. The leg resting portion connecting arm 53 has an elongated shape that is long in the front-rear direction. The other end of the leg rest portion connecting arm 53 is rotatably connected to a bracket 54 as a push-up member provided on the front side of the vehicle body frame 10 by a support shaft 55. The bracket 54 is rotatably attached to the vehicle body frame 10 by a support shaft 51 coaxial with the legrest frame 50. The bracket 54 rotates around the support shaft 51 when the leg resting portion connecting arm 53 moves back and forth.

  As shown in FIG. 6, the bracket 54 is formed with a support plate 54a for supporting the leg mounting frame 50 from below. When the bracket 54 rotates about the support shaft 51, the support plate 54a moves up and down, and the front side of the legrest frame 50 can be raised and lowered.

  With this configuration, as shown in FIG. 7, when the backrest frame 20 swings rearward and the tip 20a moves forward, the legrest connecting arm 53 moves forward and the bracket 54 rotates, The support plate 54 a pushes up the front side of the legrest frame 50. As a result, the wheelchair 1 is deformed into a bed shape. It should be noted that the length of the legrest connecting arm 53 may be set so that the angle of the legrest frame 50 is substantially horizontal when the backrest frame 20 is tilted backward to a substantially horizontal posture. In the present embodiment, for example, the leg rest part connecting arm 53 and the bracket 54 constitute a leg rest part push-up mechanism.

  Next, the horizontal maintenance function of the armrest portion 5 will be described. FIG. 8 is a perspective view showing an outline of the skeleton of the wheelchair 1 for realizing the horizontal maintenance function.

  In the armrest portion 5, an elongated, substantially rectangular parallelepiped armrest frame 60 is disposed. The armrest frame 60 is fixed to one end portion of an armrest shaft 61 that penetrates the backrest frame 20 horizontally from the side. The armrest shaft 61 penetrates the backrest frame 20 in a freely rotatable manner. By this armrest shaft 61, the armrest frame 60 swings integrally with the backrest frame 20.

  The other end of the armrest shaft 61 penetrates through a connecting member 62 disposed inside the backrest frame 20 so as to be freely rotatable. For example, the connecting member 62 is formed in a plate shape with a flat bottom surface and is arranged in an upright state. The armrest shaft 61 passes through the front portion of the connecting member 62. One end of a crank arm 64 is rotatably connected to the support shaft 63 fixed to the rear portion of the connecting member 62. The support shaft 63 is provided at the same height as the armrest shaft 61. The other end of the crank arm 64 is rotatably connected to one end of a fixed shaft 65 fixed to the vehicle body frame 10. The fixed shaft 65 is disposed in parallel to the armrest shaft 61, and the other end portion of the fixed shaft 65 is fixed to the vehicle body frame 10 by a fixing member 66, for example. For example, as shown in FIG. 9, the fixed shaft 65 is arranged at the same height as the support shaft 21 on the rear side of the support shaft 21 of the backrest frame 20.

  The crank arm 64 is mounted so that the distance between the support shaft 63 and the fixed shaft 65 of the crank arm 64 and the distance between the support shaft 21 of the back frame 20 and the armrest shaft 61 are equal to each other in parallel with the back frame 20. . A parallel crank mechanism is formed by a link made up of the body frame 10, the backrest frame 20, the connecting member 62 and the crank arm 64, and a pair of the armrest shaft 61, the support shaft 21, the support shaft 63 and the fixed shaft 65. The connecting member 62 is always kept in a horizontal position even if the oscillates.

  As shown in FIG. 8, a bracket 67 as a rotating member that rotates together with the armrest shaft 61 is attached between the backrest frame 20 of the armrest shaft 61 and the connecting member 62. In the bracket 67, for example, a contact plate 67a having the same posture as the armrest frame 60 is formed symmetrically with respect to the armrest shaft 61. The abutting plate 67a is formed in a long rectangular shape on the side of the connecting member 62, and comes into contact with the lower surface of the connecting member 62 when the armrest frame 60 is lowered from the standing posture and assumes a horizontal posture as shown in FIG. The rotation of the armrest shaft 61 can be stopped. Thereby, when the armrest frame 20 is being lowered, the armrest frame 20 is maintained in the same horizontal posture as the connecting member 62. Further, if necessary, the armrest frame 20 can be rotated upward. In the present embodiment, for example, an armrest shaft 61, a connecting member 62, a crank arm 64, and a fixed shaft 65 constitute a horizontal maintaining mechanism.

  Next, the moving mechanism 6 of the wheelchair 1 will be described. As shown in FIG. 11, the moving mechanism 6 includes, for example, two front wheels 70 and two rear wheels 71 arranged on the front and rear sides of the vehicle body, first and second drive shafts 72 and 73, and first and second wheels. It is mainly composed of connecting arms 74 and 75. The first and second drive shafts 72 and 73 are provided, for example, side by side at the center of the outer surface of each body frame 10. The upper end of the first connecting arm 74 is connected to the first drive shaft 72 on the front side of the vehicle body, and the front wheel 70 is attached to the lower end of the first connecting arm 74. An upper end portion of the second connecting arm 75 is connected to the second drive shaft 73 on the rear side of the vehicle body, and a rear wheel 71 is attached to the lower end portion of the second connecting arm 75. The first connection arm 74 and the second connection arm 75 are rotated around the axis by first and second drive shafts 72 and 73 each having an electric drive unit such as an actuator (not shown). The distance between the front wheel 70 and the rear wheel 71 can be changed by adjusting the inner angle between 74 and the second connecting arm 75. As the angle between the first connecting arm 74 and the second connecting arm 75 increases and the distance between the front wheel 70 and the rear wheel 71 increases, the position of the seat portion 2 decreases, and the first connecting arm 74 and the second connecting arm 75 decrease. The angle between the connecting arm 75 is narrowed and the distance between the front wheel 70 and the rear wheel 71 is narrowed, so that the position of the seat portion 2 is raised. In addition, the seat part 2 can be adjusted to a user's desired height by the electric drive part which is not shown in figure.

  The wheelchair 1 according to the present embodiment is configured as described above. For example, when the user stands up from the wheelchair 1, the backrest 3 is raised from the rearward tilting posture to the standing posture by a predetermined angle θ or more, so that the rear side of the seating portion 2 rises and the seating portion 2 tilts. At this time, the back of the user is pushed by the backrest 3, and the center of gravity of the body is moved forward by the inclination of the seat 2, thereby assisting the user to stand up. Further, when the user lies on the wheelchair 1, the backrest portion 3 is tilted backward to push up the front side of the legrest portion 4, and the backrest portion 3, the seat portion 2, and the legrest portion 4 approach horizontal. The wheelchair 1 is deformed into a bed shape.

  When the user sits on the wheelchair 1, the armrest portion 5 is kept horizontal by lowering the armrest portion 5 to a horizontal posture regardless of the inclination angle of the backrest portion 3. The armrest portion 5 can be raised to a standing state as necessary. Further, the first and second drive shafts 72 and 73 of the moving mechanism 6 are rotated, and the angle between the first connecting arm 74 and the second connecting arm 75 is changed, so that the height of the seat portion 2 is increased. Is adjusted.

  According to the above embodiment, the wheelchair 1 is provided with the mechanism for tilting the seat portion 2 in conjunction with the tilting of the backrest portion 3, so that the user can stand up with a simpler mechanism than before. It can be performed. As a result, the wheelchair 1 can be reduced in weight, size, and cost as compared with the prior art.

  Since the seat portion 2 is inclined when the backrest portion 3 stands up by a predetermined angle θ or more, the backrest portion 3 pushes the user's back, and the user stands up at both the backrest portion 3 and the seat portion 2. Can assist.

  Since the roller 36 is provided at the contact portion between the bracket 33 and the seat portion 2 that pushes up the seat portion 2, the seat portion 2 is pushed up while the roller 36 rotates, and the seat portion 2 is pushed up smoothly with little friction. .

  Since the wheelchair 1 is equipped with a mechanism for pushing up the front side of the leg rest portion 4 in conjunction with the tilting of the backrest portion 3, for example, the wheelchair 1 can be used as a bed. Further, for example, the user can be suitably moved from the bed to the wheelchair 1 and from the wheelchair 1 to the bed. Furthermore, the above-described deformation to the bet state can be performed with a simpler mechanism.

  Since the wheelchair 1 is provided with a mechanism for maintaining the armrest 5 horizontally, the user can always sit on the wheelchair 1 in a relaxed state. Since the armrest portion 5 is kept horizontal using a parallel crank mechanism attached to the backrest portion 3, the horizontal maintenance function of the armrest portion 5 can be realized with a simple mechanism that does not use a motor or the like.

  The distance between the front wheel 70 and the rear wheel 71 is adjusted by rotating the first connecting arm 74 that connects the seat 2 and the front wheel 70 and the second connecting arm 75 that connects the seat 2 and the rear wheel 71. Since the height of the seat 2 can be adjusted, the height of the seat 2 can be adjusted with a simple mechanism.

  The example of the embodiment of the present invention has been described above, but the present invention is not limited to this example and can take various forms.

  INDUSTRIAL APPLICABILITY The present invention is useful when assisting a user's standing motion in a wheelchair with a simpler mechanism.

It is a perspective view of the wheelchair concerning this embodiment. It is a perspective view which shows the structure of the skeleton of the wheelchair for implement | achieving a stand-up assistance function. It is a perspective view of a blank member. It is a schematic diagram which shows the outline of a structure of a wheelchair when a seat part frame inclines. It is a perspective view which shows the structure of the wheelchair for implement | achieving the push-up function of a leg mounting part. It is a perspective view of a bracket periphery. It is a schematic diagram which shows the outline of a structure of a wheelchair when the front side of a leg mounting frame is pushed up. It is a perspective view which shows the structure of the wheelchair for implement | achieving the horizontal maintenance mechanism of an armrest part. It is a side view which shows the outline of a structure of the wheelchair provided with the parallel crank mechanism. It is a perspective view which shows the structure of a wheelchair when an armrest part is maintained horizontally. It is a schematic diagram of the wheelchair for showing the structure of a moving mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheelchair 2 Seat part 3 Backrest part 4 Leg rest part 5 Armrest part 10 Body frame 11 Seat part frame 12 Support shaft 20 Backrest frame 20a Tip part 21 Support shaft 30 Crank member 31 Seat part connection arm 33 Bracket 35 Support shaft 37 Roller

Claims (13)

A seat,
A backrest that tilts between a standing posture and a tilted posture;
A seat tilt mechanism that tilts the seat from a horizontal state so that the rear side of the seat rises in conjunction with a tilting operation from the back tilt position to the standing position of the backrest section; Characteristic wheelchair. The wheelchair according to claim 1, wherein the seat tilt mechanism tilts the seat when the backrest stands more than a predetermined angle. The seat tilt mechanism is
A seat connecting arm that is movable in the front-rear direction of the vehicle body in conjunction with the tilting motion of the backrest;
The wheelchair according to claim 2, further comprising a rotating member that rotates by moving the seat connecting arm and pushes up the rear side of the seat. The wheelchair according to claim 3, wherein a rotatable roller is attached to a contact portion between the rotating member and the seat portion. The backrest portion includes a backrest frame that swings around a support shaft during tilting motion;
5. The wheelchair according to claim 3, wherein the seat connecting arm can be moved in the front-rear direction by swinging the back frame. A crank member rotatably attached to a support shaft of the backrest frame;
The crank member can be pushed and rotated by the back frame when the back frame swings more than a specific angle;
The wheelchair according to claim 5, wherein the seat connecting arm is connected to the crank member and is movable in the front-rear direction by rotation of the crank member by the backrest frame. A leg rest part formed from the seat part toward the depression direction on the front side;
2. A leg rest part push-up mechanism that pushes up the front side of the leg rest part in conjunction with a tilting operation of the backrest part from a standing posture to a rearward tilting posture. , 3, 4, 5 or 6. The leg rest part push-up mechanism is
A legrest connecting arm that moves in the front-rear direction in conjunction with the tilting motion of the backrest;
The wheelchair according to claim 7, further comprising: a push-up member that is rotated by the movement of the leg mounting portion connecting arm to push up the leg mounting portion from below. An armrest attached to the backrest;
A horizontal maintaining mechanism that maintains the armrest portion horizontally regardless of the inclination angle of the backrest portion, further comprising: 1, 2, 3, 4, 5, 6, 7, or 8 The wheelchair described in any one. The wheelchair according to claim 9, wherein the horizontal maintenance mechanism maintains the armrest portion horizontally using a parallel crank mechanism. The backrest portion has a backrest frame that swings relative to the base of the vehicle body,
The horizontal maintenance mechanism is:
A horizontal axis that supports the armrest portion and rotatably penetrates the backrest frame from the side;
A crank arm swingably attached to the base so as to swing in parallel with the back frame;
A connecting member for connecting the horizontal shaft and the crank arm;
The wheelchair according to claim 10, wherein the connecting member is maintained horizontally regardless of a swing angle of the backrest frame and the crank arm. The horizontal axis is connected to the connecting member so as to be rotatable around the axis, and the armrest portion is rotatable with respect to the connecting member together with the horizontal axis,
A rotating member that rotates together with the horizontal axis is attached to the horizontal axis.
The rotating member is attached to the horizontal shaft so as to abut against the connecting member and stop the rotation of the horizontal shaft when the armrest portion is lowered from a standing posture to a horizontal posture. The wheelchair according to claim 11. A first connecting arm that connects the front wheel disposed on the front side of the vehicle body and the seat;
A second connecting arm for connecting the rear wheel disposed on the rear side of the vehicle body and the seat portion;
The first connecting arm and the second connecting arm have one end rotatably attached to the seat, and rotate relative to the seat to widen the distance between the front wheel and the rear wheel. The position of the seat can be increased by lowering the position of the seat and reducing the distance between the wheels. The wheelchair according to any one of 10, 11 and 12.

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