Wheelchair

Abstract

The wheelchair (2) is provided with a back support (24) whose inclination can be changed, and a lumbar support (26) whose position with respect to the back support (24) is changed in conjunction with the inclination of the back support (24). Preferably, the back support (24) moves and tilts in the longitudinal direction relative to the seat (18). Preferably, the position of the waist support (26) relative to the back support (24) is changed according to the inclination angle of the back support (24).

Description

[0001] This application claims priority based on Japanese patent application No. 2023-144568 filed on September 6, 2023. The entire contents of these Japanese applications are incorporated herein by reference. Technical Field

[0002] These instructions relate to wheelchairs. Background Art

[0003] Japanese Utility Model Registration No. 3214839 discloses a wheelchair with a backrest (hereinafter also referred to as a back support). The wheelchair has a first pillow that contacts the waist of a user. The first pillow is mounted on the backrest. The first pillow fills the gap between the waist of the user and the backrest. The first pillow functions as a waist support. Through the first pillow, the upper body of the user can be supported by the backrest in a stable state.

[0004] However, there is a wheelchair whose inclination angle of the back support can be changed. In this wheelchair, the back support can support the upper body of the user regardless of whether the upper body is raised or laid down.

[0005] In this wheelchair, due to the change in the inclination of the back support, the user's waist and the waist support are offset. This positional offset causes discomfort to the user. In order to eliminate this discomfort, the position of the waist support needs to be adjusted.

[0006] The present applicant intends to provide a wheelchair capable of suppressing the positional deviation of the lumbar support caused by changing the inclination of the back support. Summary of the invention

[0007] Means of solving the problem: The wheelchair disclosed in this specification has: A back support that can change its inclination, and A lumbar support that changes its position relative to the back support in conjunction with the tilt of the back support.

[0008] The wheelchair can suppress the positional deviation of the lumbar support caused by changing the inclination of the back support. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a perspective view showing a wheelchair in use according to one embodiment; Figure 2 It is shown Figure 1 A perspective view of a frame of a wheelchair; Figure 3 It is shown Figure 1 A three-dimensional view of the frame of the wheelchair in other usage states; Figure 4 yes Figure 2 A side view of a frame of a wheelchair; Figure 5 yes Figure 4 A partial enlarged view of Figure 6 It is shown Figure 1 A side view of the frame of the wheelchair in another usage state; Figure 7 yes Figure 3 A side view of a frame of a wheelchair; Figure 8 is along Figure 5 A partial cross-sectional view of line segment VIII-VIII; Fig. 9 is a partial side view of a wheelchair in use according to another embodiment; then, Fig.10 yes Fig. 9 Partial side view of the wheelchair in other usage states. DETAILED DESCRIPTION

[0010] Hereinafter, preferred embodiments will be described in detail with reference to the drawings as appropriate.

[0011] Figure 1 A wheelchair 2 is shown. Figure 1 The arrow X indicates that the front-to-back direction of the wheelchair 2 is facing forward, the arrow Y indicates that the left-to-right direction is facing left, and the arrow Z indicates that the up-down direction is facing upward.

[0012] The wheelchair 2 includes a pair of left and right side frames 4, a pair of left and right back frames 6, a head frame 8, a pair of left and right waist frames 10, a pair of left and right leg supports 12, a pair of left and right front wheels 14, a pair of left and right rear wheels 16, a seat 18, a backrest 20 and a waistrest 22.

[0013] The back chair 20 has a plurality of belts 20A. The belts 20A are respectively mounted on a pair of back frames 6. The back chair 20 is not limited to a plurality of belts 20A. The back chair 20 may be, for example, a sheet. In addition, the material of the belt 20A is not particularly limited. The material may be, for example, stretchable fabric. A pair of back frames 6 are connected via a head frame 8. The pair of back frames 6, the head frame 8 and the back chair 20 constitute a back support 24 that supports the back of the user. The back chair 20 constitutes a front surface 24A of the back support 24.

[0014] The waist chair 22 has a plurality of belts 22A. The belts 22A are respectively mounted on a pair of waist frames 10. The waist chair 22 is not limited to a plurality of belts 22A, and may be, for example, a thin plate. In addition, the material of the belt 22A is not particularly limited. The material may be, for example, a stretchable fabric. A pair of waist frames 10 and the waist chair 22 constitute a waist support 26 that supports the user's waist. The waist support 26 has a waist contact portion 26A that contacts the user's waist.

[0015] Figure 2 FIG. 2 shows a state where the seat 18, the backrest 20 and the waistrest 22 are removed from the wheelchair 2. Figure 2 As shown, the wheelchair 2 further includes a transverse frame 28 , a pair of guides 30 , and a pair of arms 32 .

[0016] The transverse frame 28 includes a pair of seat tubes 28A and a pair of cross beams 28B. The pair of seat tubes 28A extends in the front-rear direction along the side frame 4. The seat tubes 28A are supported by the side frame 4. The seat tubes 28A can be loaded and unloaded on the side frame 4. The pair of cross beams 28B includes a cross beam 28C and a cross beam 28D. The central portion of the cross beam 28C is hinged to the central portion of the cross beam 28D. The upper end portion of the cross beam 28C is fixed to the seat tube 28A on the left side. The lower end portion of the cross beam 28C is hinged to the side frame 4 on the right side. The upper end portion of the cross beam 28D is fixed to the seat tube 28A on the right side. The lower end portion of the cross beam 28D is hinged to the side frame 4 on the left side. The transverse frame 28 is connected to the pair of side frames 4.

[0017] The beam pair 28B is rotatable. The head frame 8 is removed and the beam pair 28B is rotated, thereby changing the width of the wheelchair 2. The wheelchair 2 can change its posture between a use posture in which the left and right side frames 4 are separated from each other and a folded posture in which the left and right side frames 4 are close to each other. The wheelchair 2 is a so-called folding wheelchair. In addition, Figure 1 and Figure 2 The wheelchair 2 is in a use posture.

[0018] The front wheel 14 is installed in front of the side frame 4. The rear wheel 16 is installed at the rear of the side frame 4. Figure 1 As shown, the seat 18 is mounted on the seat tube 28A. The seat 18 is located on the side frame 4.

[0019] Figure 3 and Figure 2 Similarly, the figure shows a state where the seat 18 , the backrest 20 , and the waistrest 22 are removed from the wheelchair 2 . Figure 3 FIG. 2 shows a state where the back support 24 (back frame 6) is tilted relative to the side frame 4. Figure 2 The usage status and Figure 3 The inclination of the back support 24 can be changed between the use states.

[0020] Figure 4 Show Figure 2 The back frame 6 is located at the rear of the side frame 4. The back frame 6 extends upward from the side frame 4. The waist frame 10 is located at the rear of the side frame 4. The waist frame 10 is located in front of the back frame 6. The waist frame 10 is located above the side frame 4.

[0021] like Figure 4As shown, the wheelchair 2 also has a gas spring 40. The gas spring 40 is arranged between the side frame 4 and the back support 24. The gas spring 40 has a cylinder 40A and a rod 40B. The cylinder 40A is hinged to the back frame 6. The rod 40B is hinged to the side frame 4. The rod 40B moves relative to the cylinder 40A, so that the gas spring 40 can be extended and retracted. Although not shown in the figure, the gas spring 40 has a lock. The lock prevents the rod 40B from moving relative to the cylinder 40A. In addition, in the gas spring 40, the cylinder 40A may be hinged to the side frame 4, and the rod 40B may be hinged to the back frame 6. In addition, the gas spring 40 is an example, as long as it is retractable and can generate an applied force. For example, an actuator and a mechanical lock may be used instead of the gas spring 40.

[0022] The wheelchair 2 also includes a pair of left and right handles 42 and a pair of left and right levers 44 (see Figure 1 ).like Figure 4 As shown, the handle 42 protrudes backward from the back frame 6. The rod 44 is mounted on the handle 42. The rod 44 is rotatable. The rod 44 is rotated in a direction close to the handle 42, thereby releasing the lock of the gas spring 40. Due to the unlocking, the rod 40B becomes movable relative to the cylinder 40A. The rod 44 is urged in a rotation direction away from the handle 42 by an elastic body not shown. Due to this urging, the rod 44 is separated from the handle 42 in a free state. The lock prevents the rod 40B from moving relative to the cylinder 40A.

[0023] like Figure 4 As shown, the waist frame 10 has an upper end portion 10A which is inclined from the bottom to the upper end toward the direction close to the back frame 6. The upper end portion 10A is hinged to the back frame 6. The waist frame 10 is rotatable relative to the back frame 6. The lower end portion 10B of the waist frame 10 is supported by a guide member 30.

[0024] Figure 5 Show Figure 4 A partial enlarged view of . Figure 5 A portion of the seat 18 is also shown. Figure 5 As shown, the guide member 30 includes a plate 30A, four guide rollers 30B, a support frame 30C and a slide groove 30D. Figure 5 The two-dot chain line LB represents the axis line of the back frame 6. The two-dot chain line LV represents a straight line (vertical line) extending in the vertical direction.

[0025] Four guide rollers 30B are mounted on the plate 30A. The guide rollers 30B are in contact with the back frame 6, respectively. The guide member 30 supports the back frame 6 via the four guide rollers 30B. The back frame 6 is movable in the direction of the axis LB relative to the guide member 30. In other words, the back support 24 is movable in the length direction relative to the guide member 30. In addition, the number of guide rollers 30B is not particularly limited. Furthermore, the supporting member of the back frame 6 is not limited to the guide rollers 30B. For example, the supporting member may also support the back frame 6 slidably.

[0026] The support frame 30C is fixed to the plate 30A. The support frame 30C has a support surface 30E. The support surface 30E extends obliquely with respect to the back frame 6. The support surface 30E extends from the upper side of the back frame 6 to the lower side, and is inclined in a direction away from the back frame 6. Figure 5 The two-dot chain line LF indicates the extension direction of the support surface 30E. The double arrow θF indicates the angle between the two-dot chain line LF (the extension direction of the support surface 30E) and the axis LB of the back frame 6. The double arrow θV indicates the angle between the vertical line LV and the axis LB of the back frame 6, that is, the inclination angle of the back support 24.

[0027] The slide groove 30D is formed in the support frame 30C. The slide groove 30D extends along the support surface 30E. Figure 5 The two-dot chain line LS indicates the center line of the slide groove 30D. The center line LS is parallel to the two-dot chain line LF.

[0028] like Figure 5 and Figure 8 As shown, the waist frame 10 has a roller 10C. The roller 10C is mounted on the lower end 10B. The roller 10C is prevented from coming off from the support frame 30C by the shaft 10D and the slide groove 30D described later. The roller 10C is in contact with the support surface 30E. The roller 10C can move along the support surface 30E. As a result, the lower end 10B of the waist frame 10 can move relative to the guide 30.

[0029] The guide member 30 is hinged to the side frame 4. The guide member 30 is rotatable relative to the side frame 4. One end of the arm 32 is hinged to the side frame 4. The arm 32 is rotatable relative to the side frame 4. The rotation center of the arm 32 is located forward of the rotation center of the guide member 30. The other end of the arm 32 is hinged to the back frame 6. Symbol PB represents the rotation center of the other end of the arm 32 and the lower end of the back frame 6.

[0030] In the wheelchair 2, when the back frame 6 is pressed down, the back frame 6 slides relative to the guide 30. Furthermore, when the back frame 6 is pressed down, the arm 32 rotates relative to the side frame 4. The guide 30 rotates relative to the side frame 4 by the rotation of the arm 32. Thus, the back frame 6 slides relative to the guide 30 and rotates relative to the side frame 4 together with the guide 30.

[0031] Furthermore, by pressing down the back frame 6, the lower end 10B of the waist frame 10 is also pressed down relative to the guide 30. The roller 10C of the waist frame 10 is supported by the support surface 30E. The lower end 10B of the waist frame 10 moves downward along the support surface 30E. While the lower end 10B moves downward, it moves away from the back frame 6 (axis LB). The lower end 10B protrudes from the back frame 6 to the front thereof.

[0032] Figure 6 Shown from Figure 4 The wheelchair 2 is used in a state where the back frame 6 is tilted. The rotation center PB of the back frame 6 is Figure 4 Compared with the usage status, it is located in the front. Figure 6 In the use state, Figure 4 The lower end portion 10B of the waist frame 10 protrudes forward of the back frame 6 compared to the use state of the back frame 6.

[0033] Figure 7 Shown from Figure 6 The wheelchair 2 is used in a state where the back frame 6 is further tilted. The rotation center PB of the back frame 6 is Figure 6 Compared with the usage state, it moves further forward. Figure 7 In the use state, Figure 6 The lower end portion 10B of the waist frame 10 further protrudes forward of the back frame 6 compared to the usage state of the back frame 6.

[0034] Figure 8 Shown along Figure 5 The section of line segment VIII-VIII. Figure 8 As shown, the waist frame 10 has a shaft 10D, a nut 10E, a collar 10F, a pair of flange collars 10G, a pair of collars 10H and a pair of flange bushings 10J.

[0035] The shaft 10D is screwed into the nut 10E. The collar 10F, a pair of flange collars 10G, and a pair of collars 10H are clamped by the nut 10E and the head of the shaft 10D and fixed to the shaft 10D. The collar 10F and the flange collar 10G clamp the lower end 10B of the waist frame 10. Thus, the shaft 10D, the nut 10E, the collar 10F, a pair of flange collars 10G, and a pair of collars 10H are mounted on the lower end 10B.

[0036] A roller 10C is mounted on the radially outer side of the collar 10F. The roller 10C is rotatable and is made of, for example, resin.

[0037] Each flange bushing 10J is fitted into the collar 10H. The flange bushing 10J is attached to the collar 10H. The material of the flange bushing 10J is, for example, resin.

[0038] Reference Figures 1 to 8The reclining action of the wheelchair 2 is described below. Figure 1 The usage status of the wheelchair 2 is described below.

[0039] The assistant holds the handle 42 and the rod 44 together. The lock of the gas spring 40 is released. The gas spring 40 generates an applied force in the direction in which the rod 40B protrudes from the cylinder 40A. The assistant resists this applied force and presses down the handle 42. The back support 24 is pressed down and rotated. As a result, the back support 24 moves in the longitudinal direction relative to the guide 30 and rotates relative to the side frame 4. In conjunction with the tilting of the back support 24, the lower end 26B of the lumbar support 26 protrudes from the back support 24 to the front thereof. The assistant lets go of the rod 44. The gas spring 40 is locked. As a result, the back support 24 maintains the tilted state. The tilted state of the back support 24 can be Figure 7 The usage status can also be Figure 6 usage status.

[0040] Then, for example, in Figure 7 On the wheelchair 2 in the use state, the assistant holds the handle 42 and the rod 44 together. The lock of the gas spring 40 is released. The assistant lifts the handle 42. The back support 24 is lifted and rotated. The gas spring 40 applies force in the direction in which the back support 24 is lifted and rotated. The gas spring 40 assists the rotation of the back support 24. In conjunction with the tilting of the back support 24, the lower end 26B of the lumbar support 26 approaches the back support 24. The assistant lets go of the rod 44. The gas spring 40 is locked. As a result, the back support 24 remains lifted. In this way, for example, the wheelchair 2 becomes Figure 1 usage status.

[0041] The wheelchair 2 includes a lumbar support 26 whose position relative to the back support 24 changes in conjunction with the inclination of the back support 24. Thus, even if the inclination of the back support 24 is changed, the wheelchair 2 can suppress the positional deviation between the user's waist and the lumbar support 26. The effort and time required to adjust the position of the lumbar support 26 can be reduced.

[0042] The back support 24 moves and tilts the rotation center PB relative to the seat 18. In other words, the back support 24 moves and tilts in the longitudinal direction. The wheelchair 2 can suppress the positional deviation between the user's back and the back support 24. Furthermore, in the wheelchair 2, the positional deviation of the lumbar support 26 relative to the user's waist can be suppressed.

[0043] The position of the lumbar support 26 relative to the back support 24 is determined by the inclination angle θV of the back support 24 (see Figure 5 The wheelchair 2 can make the lumbar support 26 and the back support 24 match the inclination angle θV and be located at an appropriate position.

[0044] The waist contact portion 26A of the waist support 26 protrudes from the back support 24 toward the front of the back support 24 as the inclination angle θV of the back support 24 increases. The waist contact portion 26A can fill the gap between the user's waist and the back support 24 in accordance with the increase in the inclination angle θV of the back support 24.

[0045] The guide 30 has a support surface 30E that supports the lumbar support 26 so as to be relatively movable. In the wheelchair 2, the lower end 26B of the lumbar support 26 (the lower end 10B of the lumbar frame 10) is supported by the support surface 30E. The lower end 26B of the lumbar support 26 can move smoothly by being supported by the support surface 30E. In addition, the lumbar support 26 can receive the force received by supporting the user through the support surface 30E.

[0046] The guide member 30 restricts the moving direction of the lumbar support 26. The shaft 10D and the slide groove 30D prevent the roller 10C of the lumbar frame 10 from coming off from the support frame 30C. The guide member 30 can guide the lumbar support 26 to an appropriate position.

[0047] The guide member 30 moves the lumbar support 26 in a direction inclined with respect to the front surface 24A of the back support 24. The guide member 30 can guide the lumbar support 26 in a direction that properly fills the gap between the waist of the user and the back support 24.

[0048] The waist contact portion 26A that protrudes greatly from the back support 24 easily abuts against the waist of the user. The waist contact portion 26A easily fills the gap between the waist of the user and the back support 24. From this viewpoint, the angle θF formed by the axis LB of the back frame 6 and the extension direction LF of the support surface 30E (movement direction of the waist contact portion 26A) is preferably 4° or more, more preferably 6° or more, and particularly preferably 8° or more.

[0049] On the other hand, the waist contact portion 26A that protrudes too much from the back support 24 partially presses against the waist of the user. Such a waist contact portion 26A is likely to give the user a sense of discomfort. From the viewpoint of giving the user a sense of discomfort, the angle θF is preferably 16° or less, more preferably 14° or less, and particularly preferably 12° or less.

[0050] The guide 30 supports the lower end portion 10B of the waist frame 10. In other words, the guide 30 supports the lower end portion 26B of the waist support 26. The guide 30 can accurately guide the position of the waist contact portion 26A of the waist support 26.

[0051] The waist frame 10 is rotatably mounted on the back frame 6. The waist support 26 is rotatably mounted on the back support 24. The position of the waist support 26 is easily changed according to the inclination of the back support 24. Thus, the wheelchair 2 is linked to the inclination of the back support 24, and the position of the waist support 26 is easily changed.

[0052] In particular, in the wheelchair 2, the back support 24 moves and tilts with respect to the seat 18 while the rotation center PB is moved. This suppresses the positional deviation between the user's back and the back support 24. The lumbar support 26 is rotatably mounted on the back support 24. This suppresses the positional deviation between the user's waist and the lumbar support 26 as the back support 24 moves.

[0053] like Figure 4 As shown in FIG. 1 , the waist frame 10 has an upper end portion 10A which is inclined from the bottom to the upper end toward the direction close to the back frame 6. Figure 1 As shown in FIG. 1 , the lumbar support 26 has an upper end portion 26C that is inclined from the bottom to the upper end in a direction close to the back support 24. This upper end portion 26C can prevent the step difference from the back support 24 from increasing even if the position of the lumbar support 26 changes relative to the back support 24. Since the step difference does not increase, the upper end portion 26C of the lumbar support 26 can be prevented from strongly pressing the back of the user.

[0054] Furthermore, in the wheelchair 2, by pressing down the back frame 6, the waist frame 10 is also pressed down. Figure 8 As shown, the roller 10C of the waist frame 10 is guided by the support surface 30E of the guide 30 and moves. The roller 10C rolls on the support surface 30E of the guide 30. The roller 10C is made of resin, so it can prevent the occurrence of sliding sound between metals. In addition, the lower end 10B of the waist frame 10 moves relative to the guide 30. The flange bushing 10J is located between the lower end 10B and the guide 30. The material of the flange bushing 10J is made of resin, so it can prevent the occurrence of sliding sound between metals.

[0055] Fig. 9 Another wheelchair 52 is shown. Here, a structure different from the wheelchair 2 will be described.

[0056] The wheelchair 52 includes a guide 54 instead of the guide 30. The wheelchair 52 includes a waist frame 56 instead of the waist frame 10. The other structures of the wheelchair 52 are the same as those of the wheelchair 2. Here, the description of the same structure as the wheelchair 2 is omitted. In addition, the same reference numerals are used for the same structure as the wheelchair 2.

[0057] The guide 54 has a bearing 58 and a rotating arm 60. The bearing 58 supports the back frame 6. The back frame 6 can slide in the axial direction relative to the bearing 58. The bearing 58 is mounted on the side frame 4. The bearing 58 is rotatable. The back frame 6 can rotate relative to the side frame 4 together with the bearing 58. One end 60A of the rotating arm 60 is rotatably mounted on the side frame 4. The other end 60B of the rotating arm 60 is hinged to the lower end 56B of the waist frame 56. The lower end 56B of the waist frame 56 is hinged to the rotating arm 60 and does not have the roller 10C. The other structures of the waist frame 56 are the same as those of the waist frame 10.

[0058] Fig.10 Show Fig. 9 Other usage states of the wheelchair 52. Fig.10 In the middle, the back frame 6 is Fig. 9 The arm 32 rotates. The rotation center PB is Fig. 9 The bearing 58 rotates relative to the side frame 4. The back frame 6 rotates together with the bearing 58. The waist frame 56 is pressed down together with the back frame 6. As the lower end 56B descends, the rotating arm 60 rotates. As a result, the lower end 56B protrudes to the front of the back frame 6.

[0059] In the wheelchair 52, the position of the lumbar support 26 relative to the back support 24 is changed in conjunction with the inclination of the back support 24 by the guide 54. The guide 30 and the guide 54 described above are examples, and the guide mentioned here can be any guide as long as it can change the position of the lumbar support 26 relative to the back support 24 in conjunction with the inclination of the back support 24. The guide mentioned here preferably moves and rotates the back support 24 in the longitudinal direction.

[0060] [Public form] The following aspects respectively disclose preferred embodiments.

[0061] [Form 1] A wheelchair having: A back support that can change its inclination, and A lumbar support that changes its position relative to the back support in conjunction with the tilt of the back support.

[0062] [Form 2] According to the wheelchair described in aspect 1, the back support is movable and tilted relative to the seat in the longitudinal direction.

[0063] [Form 3] According to the wheelchair described in aspect 1 or 2, the lumbar support changes its position relative to the back support according to the inclination angle of the back support.

[0064] [Form 4] The wheelchair according to aspect 3, wherein the lumbar support has a lumbar contact portion that contacts the waist of the user; The waist contact portion protrudes from the back support as the inclination angle increases.

[0065] [Form 5] The wheelchair according to any one of aspects 1 to 4 includes a guide having a support surface that supports the lumbar support so as to be relatively movably supported.

[0066] [Form 6] The wheelchair according to any one of aspects 1 to 5 includes a guide that restricts the moving direction of the lumbar support.

[0067] [Form 7] According to the wheelchair of aspect 6, the guide moves the lumbar support in a direction inclined with respect to the front surface of the back support.

[0068] [Form 8] According to the wheelchair described in any one of aspects 5 to 7, the guide member supports the lower end portion of the lumbar support.

[0069] [Form 9] According to the wheelchair described in any one of aspects 1 to 8, the lumbar support is rotatably mounted on the back support.

[0070] [Form 10] According to the wheelchair described in any one of aspects 1 to 9, the lumbar support has an upper end portion that is inclined from the bottom to the top in a direction approaching the back support.

[0071] The wheelchair described above can be widely used in wheelchairs with a tiltable back support.

[0072] The above description is merely an example, and various modifications may be made without departing from the essence of the present invention.

Claims

1. A wheelchair, characterized in that: have: A back support that can change its inclination, and A lumbar support that changes its position relative to the back support in conjunction with the tilt of the back support.

2. The wheelchair according to claim 1, characterized in that: The back support is movable and tiltable in a lengthwise direction relative to the seat.

3. The wheelchair according to claim 1 or 2, characterized in that: The lumbar support changes its position relative to the back support according to the inclination angle of the back support.

4. The wheelchair according to claim 3, characterized in that: The lumbar support has a lumbar contact portion that contacts the waist of the user; The waist contact portion protrudes from the back support as the inclination angle increases.

5. The wheelchair according to claim 1 or 2, characterized in that: A guide member is provided, and the guide member has a support surface for supporting the lumbar support so as to be relatively movably supported.

6. The wheelchair according to claim 1 or 2, characterized in that: A guide is provided to restrict the moving direction of the lumbar support.

7. The wheelchair according to claim 6, characterized in that: The guide moves the lumbar support in a direction inclined relative to a front surface of the back support.

8. The wheelchair according to claim 6, characterized in that: The guide supports a lower end portion of the lumbar support.

9. The wheelchair according to claim 1 or 2, characterized in that: The lumbar support is rotatably mounted to the back support.

10. The wheelchair according to claim 1 or 2, characterized in that: The lumbar support has an upper end portion which is inclined from the bottom toward the upper end in a direction close to the back support.

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