Wheelchair

Abstract

To provide a wheelchair capable of suppressing a positional deviation of a waist support by changing the inclination of a back support.SOLUTION: A wheelchair 2 includes: a back support 24 that can change its inclination; and a waist support 26 whose position with respect to the back support 24 changes in conjunction with the inclination of the back support 24. Preferably, the back support 24 inclines while moving in a longitudinal direction with respect to a seat 18. Preferably, the waist support 26 changes its position with respect to the back support 24 according to the inclination angle of the back support 24.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present specification discloses a wheelchair. [Background technology]

[0002] Patent Document 1 discloses a wheelchair equipped with a backrest (hereinafter also referred to as a back support). This wheelchair has a first pillow that is placed against the user's waist. This first pillow is attached to the backrest. This first pillow fills the gap between the user's waist and the backrest. This first pillow functions as a waist support. This first pillow allows the user's upper body to be stably supported by the backrest. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3214839 Summary of the Invention [Problem to be solved by the invention]

[0004] By the way, there are wheelchairs whose back support can be adjusted to change its inclination angle. In these wheelchairs, the back support supports the upper body of the user whether the upper body is in an upright or reclined position.

[0005] In this wheelchair, changing the inclination of the back support causes a misalignment between the user's waist and the waist support. This misalignment causes discomfort to the user. To eliminate this discomfort, it is necessary to adjust the position of the waist support.

[0006] The applicant's intention is to provide a wheelchair that can prevent the lumbar support from shifting in position due to changing the inclination of the back support. [Means for solving the problem]

[0007] The wheelchair disclosed in this specification is Adjustable back support, and A lumbar support whose position relative to the back support changes in conjunction with the inclination of the back support. Equipped with. Effect of the Invention

[0008] This wheelchair can prevent the lumbar support from shifting out of position by changing the inclination of the back support. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a wheelchair according to an embodiment in use. [Diagram 2] FIG. 2 is a perspective view showing the frame of the wheelchair of FIG. [Diagram 3] FIG. 3 is a perspective view showing the frame of the wheelchair of FIG. 1 in another state of use. [Figure 4] FIG. 4 is a side view of the frame of the wheelchair of FIG. [Diagram 5] FIG. 5 is a partially enlarged view of FIG. [Figure 6] FIG. 6 is a side view showing the frame of the wheelchair of FIG. 1 in still another state of use. [Figure 7] FIG. 7 is a side view of the frame of the wheelchair of FIG. [Figure 8] FIG. 8 is a partial cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] FIG. 9 is a partial side view of a wheelchair according to another embodiment in use. [Figure 10] FIG. 10 is a partial side view of the wheelchair of FIG. 9 in another state of use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0011] Fig. 1 shows a wheelchair 2. Arrow X in Fig. 1 indicates the forward, front-rear direction of wheelchair 2, arrow Y indicates the leftward, left-right direction, and arrow Z indicates the upward, up-down direction.

[0012] The wheelchair 2 comprises 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 foot 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 back seat 20 and a waist seat 22.

[0013] The back sheet 20 has a plurality of belts 20A. Each of the belts 20A is stretched across a pair of back frames 6. The back sheet 20 is not limited to a plurality of belts 20A. The back sheet 20 may be, for example, a single sheet. The material of the belts 20A is not particularly limited. This material may be, for example, a stretchable fabric. The 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 sheet 20 constitute a back support 24 that supports the back of the user. The back sheet 20 constitutes a front surface 24A of the back support 24.

[0014] The waist sheet 22 has a plurality of belts 22A. Each of the belts 22A is stretched across a pair of waist frames 10. The waist sheet 22 is not limited to a plurality of belts 22A, and may be, for example, a single sheet. The material of the belts 22A is not particularly limited. This material may be, for example, a stretchable fabric. The pair of waist frames 10 and the waist sheet 22 form a lumbar support 26 that supports the waist of the user. The lumbar support 26 has a lumbar support portion 26A that comes into contact with the waist of the user.

[0015] 2 shows the wheelchair 2 with the seat 18, the back seat 20 and the waist seat 22 removed. As shown in FIG. 2, the wheelchair 2 further includes a cross frame 28, a pair of guides 30 and a pair of arms 32.

[0016] The cross frame 28 includes a pair of seat pipes 28A and a cross member pair 28B. The pair of seat pipes 28A extend in the front-rear direction along the side frames 4. The seat pipes 28A are supported by the side frames 4. The seat pipes 28A are detachable from the side frames 4. The cross member pair 28B includes a cross member 28C and a cross member 28D. The center of the cross member 28C and the center of the cross member 28D are pivotally attached. The upper end of the cross member 28C is fixed to the left seat pipe 28A. The lower end of the cross member 28C is pivotally attached to the right side frame 4. The upper end of the cross member 28D is fixed to the right seat pipe 28A. The lower end of the cross member 28D is pivotally attached to the left side frame 4. The cross frame 28 connects the pair of side frames 4.

[0017] The cross member pair 28B is rotatable. The width of the wheelchair 2 can be changed by removing the head frame 8 and rotating the cross member pair 28B. This wheelchair 2 can be changed between a usage position in which the left and right side frames 4 are separated from each other, and a folded position in which the left and right side frames 4 are close to each other. This wheelchair 2 is a so-called folding wheelchair. The wheelchair 2 in Figures 1 and 2 is in a usage position.

[0018] The front wheels 14 are attached to the front of the side frames 4. The rear wheels 16 are attached to the rear of the side frames 4. As shown in Fig. 1, the seat 18 is suspended across the seat pipes 28A. The seat 18 is located on the side frames 4.

[0019] 3, like Fig. 2, shows the wheelchair 2 with the seat 18, back seat 20 and waist seat 22 removed. Fig. 3 shows the back support 24 (back frame 6) inclined relative to the side frames 4. In this wheelchair 2, the inclination of the back support 24 can be changed between the usage state in Fig. 2 and the usage state in Fig. 3.

[0020] Fig. 4 shows a side view of the wheelchair 2 of Fig. 2. The back frame 6 is located behind the side frames 4. The back frame 6 extends upward from the side frames 4. The waist frame 10 is located behind the side frames 4. The waist frame 10 is located in front of the back frame 6. The waist frame 10 is located above the side frames 4.

[0021] As shown in FIG. 4, the wheelchair 2 further includes a gas spring 40. The gas spring 40 is disposed between the side frame 4 and the back support 24. The gas spring 40 includes a cylinder 40A and a rod 40B. The cylinder 40A is pivotally attached to the back frame 6. The rod 40B is pivotally attached to the side frame 4. The gas spring 40 can expand and contract when the rod 40B moves relative to the cylinder 40A. Although not shown, the gas spring 40 includes a lock. The lock prevents the rod 40B from moving relative to the cylinder 40A. In this gas spring 40, the cylinder 40A may be pivotally attached to the side frame 4, and the rod 40B may be pivotally attached to the back frame 6. The gas spring 40 is merely an example, and may be any other type of gas spring as long as it is expandable and contractible and capable of generating a biasing force. For example, an actuator and a mechanical lock may be used instead of the gas spring 40.

[0022] The wheelchair 2 further includes a pair of left and right handles 42 and a pair of left and right levers 44 (see FIG. 1). As shown in FIG. 4, each handle 42 protrudes rearward from the back frame 6. The lever 44 is attached to the handle 42. The lever 44 is rotatable. When the lever 44 rotates toward the handle 42, the gas spring 40 is unlocked. When the lock is released, the rod 40B becomes movable relative to the cylinder 40A. The lever 44 is biased by an elastic body (not shown) in a rotational direction away from the handle 42. Due to this bias, the lever 44 is away from the handle 42 when the lever 44 is free. The lock prevents the rod 40B from moving relative to the cylinder 40A.

[0023] 4, the waist frame 10 has an upper end 10A that is inclined from the bottom to the top end toward the back frame 6. The upper end 10A is axially attached to the back frame 6. The waist frame 10 is rotatable relative to the back frame 6. A lower end 10B of the waist frame 10 is supported by a guide 30.

[0024] Fig. 5 shows a partially enlarged view of Fig. 4. Fig. 5 also shows a part of the seat 18. As shown in Fig. 5, each guide 30 has a plate 30A, four guide rollers 30B, a support frame 30C, and a slide groove 30D. The two-dot chain line LB in Fig. 5 represents the axis of the back frame 6. The two-dot chain line LV represents a straight line extending in the vertical direction (vertical line).

[0025] The four guide rollers 30B are attached to the plate 30A. Each guide roller 30B abuts against the back frame 6. The guide 30 supports the back frame 6 with the four guide rollers 30B. The back frame 6 is movable in the direction of the axis LB relative to the guide 30. In other words, the back support 24 is movable in the longitudinal direction relative to the guide 30. The number of guide rollers 30B is not particularly limited. Furthermore, the support member for the back frame 6 is not limited to the guide rollers 30B. For example, the support member may slidably support the back frame 6.

[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 at an incline with respect to the back frame 6. The support surface 30E is inclined from above to below the back frame 6, in a direction away from the back frame 6. The two-dot chain line LF in FIG. 5 represents the extension direction of the support surface 30E. The double-dot chain arrow θF represents the angle between the two-dot chain line LF (extension direction of the support surface 30E) and the axis LB of the back frame 6. The double-dot chain arrow θV represents the angle between the vertical line LV and the axis LB of the back frame 6, i.e., 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. The two-dot chain line LS in Fig. 5 represents the center line of the slide groove 30D. This center line LS is parallel to the two-dot chain line LF.

[0028] 5, the waist frame 10 has rollers 10C. The rollers 10C are attached to the lower end portion 10B. The rollers 10C are prevented from coming off by slide grooves 30D. The rollers 10C abut against a support surface 30E. The rollers 10C are movable along the support surface 30E. This allows the lower end portion 10B of the waist frame 10 to move relative to the guide 30.

[0029] The guide 30 is axially attached to the side frame 4. The guide 30 is rotatable relative to the side frame 4. One end of an arm 32 is axially attached 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 30. The other end of the arm 32 is axially attached to the back frame 6. The symbol PB represents the rotation center between the other end of the arm 32 and the lower end of the back frame 6.

[0030] In this wheelchair 2, when the back frame 6 is pushed down, the back frame 6 slides relative to the guide 30. Furthermore, when the back frame 6 is pushed down, the arm 32 rotates relative to the side frame 4. The rotation of the arm 32 causes the guide 30 to rotate relative to the side frame 4. As a result, the back frame 6 rotates together with the guide 30 relative to the side frame 4 while sliding relative to the guide 30.

[0031] Furthermore, as the back frame 6 is pushed down, the lower end 10B of the waist frame 10 is also pushed down against the guide 30. The rollers 10C of the waist frame 10 are supported on the support surface 30E. The lower end 10B of the waist frame 10 moves downward along the support surface 30E. As the lower end 10B moves downward, it moves away from the back frame 6 (axis LB). The lower end 10B protrudes forward from the back frame 6.

[0032] Figure 6 shows the wheelchair 2 in a usage state in which the back frame 6 is tilted from the usage state in Figure 4. The rotation center PB of the back frame 6 is located further forward than in the usage state in Figure 4. In the usage state in Figure 6, the lower end portion 10B of the waist frame 10 protrudes forward of the back frame 6 compared to the usage state in Figure 4.

[0033] Figure 7 shows the wheelchair 2 in a usage state in which the back frame 6 is further tilted from the usage state in Figure 6. The rotation center PB of the back frame 6 has moved further forward compared to that in the usage state in Figure 6. In the usage state in Figure 7, the lower end portion 10B of the waist frame 10 protrudes further forward of the back frame 6 compared to the usage state in Figure 6.

[0034] Fig. 8 shows a cross section taken along line VIII-VIII in Fig. 5. As shown in Fig. 8, 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 bushes 10J.

[0035] The shaft 10D is screwed into the nut 10E. The collar 10F, the pair of flange collars 10G, and the pair of collars 10H are sandwiched between the nut 10E and the head of the shaft 10D and fixed to the shaft 10D. The collar 10F and the flange collar 10G sandwich the lower end portion 10B of the waist frame 10. In this way, the shaft 10D, the nut 10E, the collar 10F, the pair of flange collars 10G, and the pair of collars 10H are attached to the lower end portion 10B.

[0036] The roller 10C is attached to the radially outer side of the collar 10F. The roller 10C is rotatable. The roller 10C is made of a material such as resin.

[0037] A collar 10H is fitted to each of the flange bushes 10J. The flange bushes 10J are attached to the collars 10H. The flange bushes 10J are made of a material such as resin.

[0038] The reclining operation of the wheelchair 2 will be described with reference to Figures 1 to 8. Here, the description will be given assuming that a user is seated in the wheelchair 2 of Figure 1.

[0039] The caregiver grips the lever 44 together with the handle 42. The gas spring 40 is unlocked. The gas spring 40 generates a biasing force in a direction in which the rod 40B protrudes from the cylinder 40A. The caregiver presses down the handle 42 against this biasing force. The back support 24 rotates while being pressed down. 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 inclination of the back support 24, the lower end 26B of the lumbar support 26 protrudes forward from the back support 24. The caregiver releases the lever 44. The gas spring 40 is locked. As a result, the back support 24 is held in an inclined state. This inclined state of the back support 24 may be the use state of FIG. 7 or the use state of FIG. 6.

[0040] Next, for example, with the wheelchair 2 in the use state of FIG. 7, the attendant grips the lever 44 together with the handle 42. The gas spring 40 is unlocked. The attendant pulls up the handle 42. The back support 24 rotates as it is pulled up. The gas spring 40 biases the back support 24 in a direction in which it rotates as it is pulled up. The gas spring 40 assists the rotation of the back support 24. In conjunction with the inclination of the back support 24, the lower end 26B of the lumbar support 26 approaches the back support 24. The attendant releases the lever 44. The gas spring 40 is locked. This holds the back support 24 in the upright position. In this way, for example, the wheelchair 2 is brought into the use state of FIG. 1.

[0041] The wheelchair 2 is equipped with a lumbar support 26 whose position relative to the back support 24 changes in conjunction with the inclination of the back support 24. This makes it possible for the wheelchair 2 to prevent misalignment between the user's waist and the lumbar support 26 even when the inclination of the back support 24 is changed. This reduces the effort required to adjust the position of the lumbar support 26.

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

[0043] The position of the lumbar support 26 relative to the back support 24 changes depending on the inclination angle θV (see FIG. 5) of the back support 24. In this wheelchair 2, the lumbar support 26 can be positioned at an appropriate position according to the inclination angle θV of the back support 24.

[0044] The lumbar support 26A of the lumbar support 26 protrudes from the back support 24 to the front of the back support 24 as the inclination angle θV of the back support 24 increases. The lumbar support 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] Guide 30 has a support surface 30E that supports lumbar support 26 so that it can move relatively. In this wheelchair 2, lower end 26B of lumbar support 26 (lower end 10B of waist frame 10) is supported by support surface 30E. Being supported by support surface 30E allows lower end 26B of lumbar support 26 to move smoothly. In addition, lumbar support 26 can receive the force it receives by supporting the user on support surface 30E.

[0046] The guide 30 regulates the direction of movement of the lumbar support 26. The slide groove 30D prevents the rollers 10C of the waist frame 10 from slipping out. The guide 30 can guide the lumbar support 26 to an appropriate position.

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

[0048] The waist support portion 26A, which protrudes a large amount from the back support 24, is likely to come into contact with the waist of the user. This waist support portion 26A is likely to fill the gap between the waist of the user and the back support 24. From this viewpoint, the angle θF between the axis LB of the back frame 6 and the extension direction LF of the support surface 30E (movement direction of the waist support 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 support 26A that protrudes too far from the back support 24 is pressed locally against the waist of the user. Such a waist support 26A is likely to cause discomfort to the user. From the viewpoint of not causing discomfort to the user, the angle θF is preferably 16° or less, more preferably 14° or less, and particularly preferably 12° or less.

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

[0051] The waist frame 10 is rotatably attached to the back frame 6. The lumbar support 26 is rotatably attached to the back support 24. The position of the lumbar support 26 can be easily changed by tilting the back support 24. This allows the wheelchair 2 to easily change the position of the lumbar support 26 in conjunction with the tilt of the back support 24.

[0052] In particular, the wheelchair 2 tilts while the back support 24 moves the rotation center PB relative to the seat 18. This prevents misalignment between the user's back and the back support 24. The lumbar support 26 is rotatably attached to the back support 24. This prevents misalignment between the user's waist and the lumbar support 26 as the back support 24 moves.

[0053] As shown in Fig. 4, waist frame 10 has upper end 10A that is inclined from the bottom to the top in a direction approaching back frame 6. As a result, as shown in Fig. 1, lumbar support 26 has upper end 26C that is inclined from the bottom to the top in a direction approaching back support 24. This upper end 26C prevents the difference in level with back support 24 from becoming large even if the position of lumbar support 26 changes with respect to back support 24. Because this difference in level does not become large, it is possible to prevent upper end 26C of lumbar support 26 from being pressed strongly against the back of the user.

[0054] In addition, in the wheelchair 2, when the back frame 6 is pushed down, the waist frame 10 is also pushed down. As shown in FIG. 8, the rollers 10C of the waist frame 10 move while being guided by the support surface 30E of the guide 30. These rollers 10C roll on the support surface 30E of the guide 30. Since these rollers 10C are made of resin, the generation of sliding noise between metals is prevented. Furthermore, the lower end portion 10B of the waist frame 10 moves relative to the guide 30. The flange bush 10J is located between this lower end portion 10B and the guide 30. Since the material of the flange bush 10J is made of resin, the generation of sliding noise between metals is prevented.

[0055] 9 shows another wheelchair 52. Here, the configuration different from the wheelchair 2 will be described.

[0056] Wheelchair 52 is equipped with a guide 54 instead of guide 30. Wheelchair 52 is equipped with a waist frame 56 instead of waist frame 10. The other configurations of wheelchair 52 are similar to those of wheelchair 2. Here, the description of the configurations similar to those of wheelchair 2 will be omitted. Furthermore, the same reference numerals will be used to describe the configurations similar to those of 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 is axially slidable relative to the bearing 58. The bearing 58 is attached to the side frame 4. The bearing 58 is rotatable. The back frame 6 is rotatable together with the bearing 58 relative to the side frame 4. One end 60A of the rotating arm 60 is rotatably attached to the side frame 4. The other end 60B of the rotating arm 60 is pivotally attached to the lower end 56B of the waist frame 56. The lower end 56B of the waist frame 56 is pivotally attached to the rotating arm 60, and does not include a roller 10C. The other configuration of the waist frame 56 is similar to that of the waist frame 10.

[0058] Figure 10 shows another use state of the wheelchair 52 of Figure 9. In Figure 10, the back frame 6 is pushed down from the use state of Figure 9. The arm 32 is rotating. The rotation center PB is located forward of that in Figure 9. The bearing 58 is rotating relative to the side frame 4. The back frame 6 is rotating together with the bearing 58. The waist frame 56 is pushed down together with the back frame 6. The lower end 56B is lowered, causing the rotating arm 60 to rotate. As a result, the lower end 56B protrudes forward of the back frame 6.

[0059] In this wheelchair 52, the position of the lumbar support 26 relative to the back support 24 changes in conjunction with the inclination of the back support 24 due to the guide 54. The above-mentioned guide 30 and this guide 54 are merely examples, and the guide referred to here may be any guide that changes 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 referred to here preferably rotates the back support 24 while moving it in the longitudinal direction.

[0060] [Disclosure form] Each of the following aspects discloses preferred embodiments.

[0061] [Aspect 1] Adjustable back support, and A lumbar support whose position relative to the back support changes in conjunction with the inclination of the back support. Equipped with a wheelchair.

[0062] [Aspect 2] 2. The wheelchair of claim 1, wherein the back support tilts while moving longitudinally relative to the seat.

[0063] [Aspect 3] 3. The wheelchair of claim 1, wherein the position of the lumbar support relative to the back support changes depending on the inclination angle of the back support.

[0064] [Aspect 4] The lumbar support has a lumbar support portion that contacts the user's lumbar region, A wheelchair as described in aspect 3, wherein the lumbar support portion protrudes from the back support as the inclination angle increases.

[0065] [Aspect 5] The wheelchair according to any one of aspects 1 to 4, further comprising a guide having a support surface that supports the lower back support so as to be relatively movable.

[0066] [Aspect 6] A wheelchair according to any one of aspects 1 to 5, further comprising a guide that regulates the direction of movement of the lumbar support.

[0067] [Aspect 7] 7. A wheelchair as described in any one of aspects 6, wherein the guide moves the lumbar support in a direction inclined relative to the front surface of the back support.

[0068] [Aspect 8] A wheelchair described in any one of aspects 5 to 7, wherein the guide supports a lower end of the lumbar support.

[0069] [Aspect 9] A wheelchair as described in any one of aspects 1 to 8, wherein the lumbar support is rotatably attached to the back support.

[0070] [Aspect 10] A wheelchair as described in any one of aspects 1 to 9, wherein the lumbar support has an upper end that slopes from the bottom toward the upper end toward the back support. [Industrial Applicability]

[0071] The wheelchair described above can be widely applied to wheelchairs in which the back support is tiltable. [Explanation of symbols]

[0072] 2. Wheelchair 18···Seat 24 Back support 24A...Front 26 Lumbar support 26A...Waist rest 26B...Lower end 26C...Top end 30 Guide 30E...Support surface

Claims

1. Adjustable back support, and A lumbar support whose position relative to the back support changes in conjunction with the inclination of the back support. Equipped with a wheelchair.

2. 2. The wheelchair according to claim 1, wherein the back support tilts while moving in a longitudinal direction relative to the seat.

3. 3. The wheelchair according to claim 1, wherein the position of the lumbar support relative to the back support changes depending on the inclination angle of the back support.

4. The lumbar support has a lumbar support portion that contacts the user's lumbar region, The wheelchair according to claim 3, wherein the lumbar support portion protrudes from the back support as the inclination angle increases.

5. 3. The wheelchair according to claim 1, further comprising a guide having a support surface for supporting the lower back support so as to be relatively movable.

6. 3. The wheelchair according to claim 1, further comprising a guide for regulating a direction of movement of the lower back support.

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

8. The wheelchair of claim 6, wherein the guide supports a lower end of the lumbar support.

9. 3. The wheelchair of claim 1 or 2, wherein the lumbar support is pivotally attached to the back support.

10. 3. The wheelchair of claim 1, wherein the lumbar support has an upper end that is inclined from the bottom toward the upper end so as to approach the back support.

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