Wheelchair

Abstract

To provide a wheelchair capable of suppressing a positional deviation between a back support and the back with a simple configuration.SOLUTION: A wheelchair 2 includes: a back support 24; and a guide 30 for supporting the back support 24 slidably in a longitudinal direction while rotating the back support by making the position of the rotation center PA of the back support 24 constant with respect to a seat surface 18A. Preferably, the guide 30 includes a support member for slidably supporting the back support 24 by making a distance from the position of the rotation center of the back support 24 to the seat surface 18A constant.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 discloses a reclining wheelchair. The reclining mechanism of this wheelchair includes a scalene four-joint link mechanism that pivotally connects a frame body, a first link, a second link, and a back support frame. The reclining mechanism further includes an operating rod having one end pivotally connected to the first link, and a link piece pivotally connected to the other end of the operating rod. The other end of the link piece is pivotally connected to the seat frame and the frame body. By setting each link of the reclining mechanism in a predetermined positional relationship, this wheelchair prevents misalignment between the backrest (hereinafter also referred to as the back support) and the user's back. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4341885 Summary of the Invention [Problem to be solved by the invention]

[0004] This wheelchair uses a reclining mechanism in which each link is in a predetermined positional relationship to prevent the backrest from shifting out of position.

[0005] The applicant's intention is to provide a wheelchair that can prevent misalignment between the back support and the back with a simple structure. [Means for solving the problem]

[0006] The wheelchair disclosed in this specification is Back support, and A guide for supporting the back support so that the back support can slide in the longitudinal direction while rotating the back support with the rotation center of the back support fixed relative to the seat surface. Equipped with. Effect of the Invention

[0007] This wheelchair has a simple structure and can prevent misalignment between the back support and the back. [Brief description of the drawings]

[0008] [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 side view of the frame of the wheelchair of FIG. [Figure 4] FIG. 4 is a partially enlarged view of FIG. [Diagram 5] FIG. 5 is a partial cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a side view showing the frame of the wheelchair in FIG. 1 in another state of use. [Figure 7] FIG. 7 is a partially enlarged view of FIG. [Figure 8] FIG. 8 is a side view showing the frame of the wheelchair of FIG. 1 in still another state of use. [Figure 9] FIG. 9 is a partially enlarged view of FIG. [Figure 10] FIG. 10 is a partial cross-sectional view taken along line XX in FIG. [Figure 11] FIG. 11 is a partial cross-sectional view taken along line XI-XI in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments will be described in detail with reference to the drawings as appropriate.

[0010] 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.

[0011] 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.

[0012] 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 the 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 longitudinal direction of the back support 24 is the direction in which the back frame 6 extends (axial direction).

[0013] 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.

[0014] Fig. 2 shows the wheelchair 2 with the seat 18, back seat 20 and 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. Note that the right arm 32 is hidden by the side frame 4 and is not shown in Fig. 2.

[0015] 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 lower part of 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 lower part of the left side frame 4. The cross frame 28 connects the pair of side frames 4.

[0016] 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.

[0017] 1, the seat 18 is suspended across a seat pipe 28A. The seat 18 is positioned on the side frame 4. The seat 18 forms a seat surface 18A.

[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.

[0019] Fig. 3 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.

[0020] As shown in FIG. 3, the wheelchair 2 further includes a gas spring 40. The gas spring 40 is disposed between the side frame 4 and the back frame 6 (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 as 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 an expandable member having, for example, an actuator and a mechanical lock may be used instead of the gas spring 40.

[0021] The wheelchair 2 further includes a pair of left and right handles 42 and a pair of left and right levers 44. 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 is able to move 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, when the lever 44 is released and in a free state, the lever 44 is away from the handle 42. When the lever 44 is released, the lock prevents the rod 40B from moving relative to the cylinder 40A.

[0022] 3, an upper end 10A of the waist frame 10 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.

[0023] Fig. 4 shows a partially enlarged view of Fig. 3. Fig. 4 also shows a part of the seat 18. As shown in Fig. 4, each guide 30 has a plate 30A, a support frame 30B, a support surface 30C, and a slide groove 30D. The two-dot chain line LB represents the axis of the back frame 6. The two-dot chain line LV represents a straight line (vertical line) extending in the vertical direction. The double-headed 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.

[0024] The support frame 30B is fixed to the plate 30A. The support surface 30C is formed on the support frame 30B. The support surface 30C is inclined from the top to the bottom of the back frame 6 in a direction away from the axis LB of the back frame 6. The two-dot chain line LF represents the extension direction of the support surface 30C. The slide groove 30D is formed on the support frame 30B. The slide groove 30D extends along the support surface 30C.

[0025] 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 are supported by a support surface 30C. The rollers 10C are movable along the support surface 30C. This allows the lower end portion 10B of the waist frame 10 to move relative to the guide 30.

[0026] The guide 30 further includes a first guide roller 31A, a second guide roller 31B, a third guide roller 31C, and a fourth guide roller 31D. The first guide roller 31A, the second guide roller 31B, the third guide roller 31C, and the fourth guide roller 31D are attached to the plate 30A. The first guide roller 31A, the second guide roller 31B, the third guide roller 31C, and the fourth guide roller 31D are each rotatable.

[0027] The first guide roller 31A and the fourth guide roller 31D abut against the back frame 6 from the front of the back frame 6. The first guide roller 31A and the fourth guide roller 31D are positioned apart from each other along the axis LB of the back frame 6. The second guide roller 31B and the third guide roller 31C abut against the back frame 6 from the rear of the back frame 6. The second guide roller 31B and the third guide roller 31C are positioned apart from each other along the axis LB of the back frame 6.

[0028] The guide 30 supports the back frame 6 with the first guide roller 31A, the second guide roller 31B, the third guide roller 31C, and the fourth guide roller 31D. The back frame 6 is movable in the axial direction LB relative to the guide 30. In other words, the back support 24 is movable in the longitudinal direction relative to the guide 30. Note that, here, four guide rollers 31, the first guide roller 31A, the second guide roller 31B, the third guide roller 31C, and the fourth guide roller 31D, are used, but the number of guide rollers 31 is not particularly limited. In addition, the support member of the back frame 6 is not limited to a rotatable one. Furthermore, for example, the support member may be a sliding bearing that slidably supports the back frame 6.

[0029] The guide 30 is axially attached to the side frame 4. The guide 30 is rotatable relative to the side frame 4. The symbol PA indicates the rotation center of the guide 30 relative to the side frame 4. The back frame 6 is rotatable together with the guide 30 relative to the side frame 4. The rotation center PA is also the rotation center of the back frame 6 (back support 24) relative to the side frame 4. The double-headed arrow DS in FIG. 4 indicates the distance from the seat surface 18A to the rotation center PA in the direction perpendicular to the seat surface 18A. The distance DS is measured when the seat 18 is tensioned tightly.

[0030] One end of the 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 PA of the guide 30. The other end of the arm 32 is axially attached to the back frame 6. Symbol PB denotes the rotation center of the back frame 6 (back support 24) relative to the arm 32.

[0031] In this wheelchair 2, as shown in Figure 4, 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.

[0032] Furthermore, as the back frame 6 is pushed down, the lower end portion 10B of the waist frame 10 is also pushed down against the guide 30. The lower end portion 10B of the waist frame 10 moves downward along the support surface 30C. As the lower end portion 10B moves downward, it moves away from the back frame 6 (axis line LB). The lower end portion 10B protrudes forward from the back frame 6.

[0033] Fig. 5 is a partial cross-sectional view taken along line VV in Fig. 4. As shown in Fig. 5, the cross-sectional shape of the back frame 6 is a hollow circle. This back frame 6 is made of a hollow pipe. Note that the back frame 6 is not limited to a hollow pipe. The back frame 6 may be a solid round bar. Also, the cross-sectional shape of the back frame 6 is not limited to a circle. This cross-sectional shape may be, for example, a polygon.

[0034] The first guide roller 31A has a support surface 31E. The support surface 31E abuts against the back frame 6. The support surface 31E follows the contour of the back frame 6. The second guide roller 31B also abuts against the back frame 6 and has a support surface 31E that follows the contour of the back frame 6. Although not shown, the third guide roller 31C and the fourth guide roller 31D also each have a support surface 31E.

[0035] The rotation center of the first guide roller 31A coincides with the pivot center PA. The first guide roller 31A and the second guide roller 31B sandwich the back frame 6 in a direction perpendicular to the axis LB of the back frame 6.

[0036] 5, double-headed arrows G1 and G2 represent the gap between the first guide roller 31A and the plate 30A. The position of the first guide roller 31A can be adjusted with respect to the plate 30A by the gaps G1 and G2. The double-headed arrows G3 and G4 represent the gap between the second guide roller 31B and the plate 30A. The position of the second guide roller 31B can be adjusted with respect to the plate 30A by the gaps G3 and G4.

[0037] Figure 6 shows another use state of the wheelchair 2. In Figure 6, the back frame 6 is tilted from the use state of Figure 3. The rotation center PB is located further forward than that in the use state of Figure 3.

[0038] Fig. 7 shows a partially enlarged view of Fig. 6. Fig. 7 also shows a part of the seat 18. The inclination angle θV of the back support 24 is larger than that of Fig. 4. The first guide roller 31A, the second guide roller 31B, the third guide roller 31C, and the fourth guide roller 31D support the upper part of the back frame 6 compared to the use state of Fig. 4. The lower end portion 10B of the waist frame 10 is supported below the support surface 30C of the guide 30 compared to the use state of Fig. 4. The lower end portion 10B protrudes forward of the back frame 6 compared to the use state of Fig. 4.

[0039] Figure 8 shows yet another use state of the wheelchair 2. In Figure 8, the back frame 6 is further tilted from the use state in Figure 6. The rotation center PB is located further forward compared to that in the use state in Figure 6.

[0040] 9 shows a partially enlarged view of FIG. 8. FIG. 9 also shows a part of the seat 18. The inclination angle θV of the back support 24 is larger than that of FIG. 7. The first guide roller 31A, the second guide roller 31B, the third guide roller 31C, and the fourth guide roller 31D support the upper part of the back frame 6 compared to the use state of FIG. 7. The lower end portion 10B of the waist frame 10 is supported further below the support surface 30C of the guide 30 compared to the use state of FIG. 7. The lower end portion 10B protrudes further forward of the back frame 6 compared to the use state of FIG. 7.

[0041] Fig. 10 shows a cross section taken along line XX in Fig. 4. As shown in Fig. 10, the side frame 4 has a shaft 4A, a nut 4B, a collar 4C, a pair of collars 4D, a pair of flange bushes 4E, and a collar 4F.

[0042] The shaft 4A is screwed into the nut 4B. The collar 4C, together with an arm support 4G of the side frame 4, is sandwiched between the nut 4B and the head of the shaft 4A. This fixes the collar 4C to the arm support 4G. The pair of collars 4D, the pair of flange bushes 4E, and the collar 4F, together with the arm 32, are attached by being sandwiched between the arm support 4G.

[0043] The pair of collars 4D are positioned between the arm support 4G and the arm 32. The flange bush 4E is positioned between the collar 4C and the arm 32 and between the collar 4F and the arm 32. The material of the pair of collars 4D and the pair of flange bushes 4E is, for example, resin.

[0044] Fig. 11 shows a cross section taken along line XI-XI in Fig. 5. As shown in Fig. 11, the arm 32 has a pair of end portions 32A, a shaft 32B, a nut 32C, a collar 32D, and a pair of flange bushes 32E.

[0045] The shaft 32B is screwed into the nut 32C. The collar 32D, together with the pair of ends 32A, is sandwiched between the nut 32C and the head of the shaft 32B and fixed to the end 32A. The pair of flange bushes 32E are fitted into and attached to the collar 32D. The back frame 6 is rotatable about the shaft 32B as a rotation axis.

[0046] The flange bushings 32E are positioned between the pair of end portions 32A and the back frame 6. The flange bushings 32E are also positioned between the collar 32D and the back frame 6. The pair of flange bushings 32E are made of a material such as resin.

[0047] 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.

[0048] In the use state shown in FIG. 1, the caregiver grips the lever 44 together with the handle 42. The lock of the gas spring 40 shown in FIG. 3 is released. This 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. From the use state shown in FIG. 1, 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 movement 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 shown in FIG. 6 or the use state shown in FIG. 8.

[0049] Next, for example, with the wheelchair 2 in the use state of FIG. 8, 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 the direction in which the back support 24 rotates as it is pulled up. The gas spring 40 assists the rotation of the back support 24. In conjunction with the back support 24 being raised, 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 raised position. In this way, for example, the wheelchair 2 is brought into the use state of FIG. 1.

[0050] In this wheelchair 2, the guide 30 tilts the back frame 6 while moving it axially relative to the seat surface 18A. The guide 30 keeps the position of the rotation center PA of the back support 24 constant relative to the seat surface 18A (seat 18). The guide 30 supports the back support 24 so that it can slide in its longitudinal direction while rotating it. The guide 30 tilts the rotation center PB between the arm 32 and the back support 24 while moving it relative to the seat surface 18A. This wheelchair 2 has a simple structure and can suppress misalignment between the user's back and the back support 24.

[0051] The guide 30 keeps the distance DS (see FIG. 4) from the rotation center PA of the back support 24 to the seat surface 18A constant. The guide 30 includes a first guide roller 31A that slidably supports the back support 24. This guide 30 prevents the distance from the seat surface 18A to the back support 24 from changing as the back support 24 slides while rotating. The first guide roller 31A is an example of a support member. The support member is not particularly limited as long as it can slidably support the back support 24 while keeping the distance DS from the rotation center PA of the back support 24 to the seat surface 18A constant.

[0052] The guide 30 includes a second guide roller 31B and a third guide roller 31C that slidably support the back support 24 from the rear of the back support 24. The second guide roller 31B and the third guide roller 31C stably support the load received by the back support 24. The second guide roller 31B and the third guide roller 31C are examples of support members, and are not limited thereto. In addition, the number of support members that support from the rear may be one, or may be three or more, and is not particularly limited.

[0053] The guide 30 includes a second guide roller 31B and a third guide roller 31C that slidably support the back support 24 at positions spaced apart from each other from the rear. The guide 30 can stably support the back support 24 from the rear in the sliding direction. The guide 30 also includes a first guide roller 31A and a fourth guide roller 31D that slidably support the back support 24 at positions spaced apart from each other from the front. The guide 30 can stably support the back support 24 from the front in the sliding direction. From the viewpoint of stably supporting in the sliding direction, the guide 30 preferably includes a support member that slidably supports the back support 24 at positions spaced apart from each other in the same direction. The number of the support members is not limited to two, and may be three or more.

[0054] In the guide 30, the first guide roller 31A supports the back support 24 from the front. When the back support 24 is raised, the first guide roller 31A supports the back frame 6. The second guide roller 31B supports the back support 24 from the rear. When the back support 24 is lowered, the second guide roller 31B supports the back frame 6. In this manner, the wheelchair 2 preferably includes two or more guide rollers 31 that support the back support 24 slidably in different directions. The two or more guide rollers 31 that support the back support 24 slidably in different directions are not limited to the first guide roller 31A and the second guide roller 31B. The two or more guide rollers 31 may be, for example, the first guide roller 31A and the third guide roller 31C, the second guide roller 31B and the fourth guide roller 31D, or the third guide roller 31C and the fourth guide roller 31D. From this viewpoint, it is preferable that the wheelchair 2 includes two or more support members that support the back support 24 so that the back support 24 can slide in different directions.

[0055] A wheelchair 2 in which the height of the rotation center PA of the back support 24 is close to the height of the seat surface 18A can reduce the change in the distance between the back support 24 and the back of the user caused by the change in the inclination angle θV of the back support 24. From this viewpoint, the distance DS from the seat surface 18A to the rotation center PA of the back support 24 is preferably 5 cm or less, more preferably 3 cm or less, and particularly preferably 1 cm or less.

[0056] In this wheelchair 2, the back frame 6 is slidably supported by the guide 30. The first guide roller 31A has a support surface 31E that follows the contour of the back frame 6, and supports the back frame 6 slidably on the support surface 31E. This allows the first guide roller 31A to slidably support the back support 24. Each of the second guide rollers 31B to 31D also has the support surface 31E, like the first guide roller 31A, and thus can slidably support the back support 24.

[0057] 5, the guide 30 includes a first guide roller 31A and a second guide roller 31B that sandwich the back frame 6 and slidably support the back frame 6 in a direction perpendicular to the axis LB of the back frame 6. The first guide roller 31A and the second guide roller 31B sandwich the back frame 6 to position the back frame 6 in the direction perpendicular to the axis LB.

[0058] On the other hand, the first guide roller 31A can move due to the gaps G1 and G2. The second guide roller 31B can move due to the gaps G3 and G4. This allows the first guide roller 31A and the second guide roller 31B to accommodate misalignment of the back frame 6. This wheelchair 2 is foldable. In a foldable wheelchair 2, the left and right back frames 6 are prone to misalignment when in the usage position. The guide 30 having gaps G1 to G4 is suitable for a wheelchair in which the distance between a pair of side frames 4 can be changed (foldable wheelchair).

[0059] As shown in Fig. 10, the pair of collars 4D are positioned between the arm support 4G and the arm 32. The material of the pair of collars 4D is, for example, resin. This prevents the generation of metal-to-metal sliding noise between the arm support 4G and the arm 32. The flange bush 4E is positioned between the collars 4C and 4F and the arm 32. The material of the pair of flange bushes 4E is, for example, resin. This prevents the generation of metal-to-metal sliding noise between the collars 4C and 4F and the arm 32.

[0060] 11, the flange bush 32E is located between the pair of ends 32A and the back frame 6 in the axial direction, and between the collar 32D and the back frame 6 in the radial direction. The pair of flange bushes 32E is made of a material such as resin. This prevents the generation of metal-to-metal sliding noise between the pair of ends 32A and the back frame 6, and between the collar 32D and the back frame 6.

[0061] 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. 4, the rollers 10C of the waist frame 10 move while being guided by the support surface 30C of the guide 30. The rollers 10C roll on the support surface 30C of the guide 30. Since the rollers 10C are made of resin, the generation of sliding noise between metals is prevented. In addition, it is preferable that the material of the rollers 10C has excellent wear resistance. From this viewpoint, the material of the rollers 10C is preferably, for example, polyacetal.

[0062] Also, from the viewpoint of preventing the generation of sliding noise between metals, it is preferable that the guide rollers 31 of this wheelchair 2 are made of resin like the rollers 10C. Furthermore, from the viewpoint of wear resistance, the material of the guide rollers 31 is preferably polyacetal.

[0063] [Disclosure form] Each of the following aspects discloses preferred embodiments.

[0064] [Aspect 1] Back support, and A guide for supporting the back support so that the back support can slide in the longitudinal direction while rotating the back support with the rotation center of the back support fixed relative to the seat surface. Equipped with a wheelchair.

[0065] [Aspect 2] A wheelchair as described in aspect 1, wherein the guide includes a support member that slidably supports the back support while keeping the distance from the rotation center of the back support to the seat surface constant.

[0066] [Aspect 3] A wheelchair as described in aspect 1 or 2, wherein the guide includes a support member that slidably supports the back support from behind the back support.

[0067] [Aspect 4] A wheelchair described in any of aspects 1 to 3, wherein the guide includes two or more support members that slidably support the back support in different orientations.

[0068] [Aspect 5] A wheelchair according to any one of aspects 1 to 4, wherein the distance from the seat surface to the position of the rotation center of the back support in a direction perpendicular to the seat surface is 5 cm or less.

[0069] [Aspect 6] The back support has a back frame slidably supported by the guide, A wheelchair described in any one of aspects 1 to 5, wherein the guide includes a support member having a support surface that follows the contour of the back frame and slidably supports the back frame on the support surface.

[0070] [Aspect 7] The back support has a back frame slidably supported by the guide, A wheelchair according to any one of aspects 1 to 6, wherein the guide includes a support member that supports the back frame so that the back frame can be slidably sandwiched in a direction perpendicular to the axis of the back frame. [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 6. Back frame 18···Seat 18A···Seat 24 Back support 30 Guide 30C...support surface 31A, 31B, 31C, 31D: Guide rollers (support members)

Claims

1. Back support, and A guide for supporting the back support so that the back support can slide in the longitudinal direction while rotating the back support with the rotation center of the back support fixed relative to the seat surface. Equipped with a wheelchair.

2. 2. The wheelchair according to claim 1, wherein the guide includes a support member that slidably supports the back support while keeping the distance from the pivot center of the back support to the seat surface constant.

3. 3. The wheelchair according to claim 1, wherein the guide includes a support member that slidably supports the back support from behind the back support.

4. The wheelchair according to claim 1 or 2, wherein the guide includes two or more support members that slidably support the back support in different directions.

5. 3. The wheelchair according to claim 1, wherein a distance from the seat surface to a position of a rotation center of the back support in a direction perpendicular to the seat surface is 5 cm or less.

6. The back support has a back frame slidably supported by the guide, 3. The wheelchair according to claim 1, wherein the guide includes a support member having a support surface that follows the contour of the back frame and slidably supports the back frame on the support surface.

7. The back support has a back frame slidably supported by the guide, 3. The wheelchair according to claim 1, wherein the guide includes a support member that supports the back frame so as to be slidable between the back frame and in a direction perpendicular to the axis of the back frame.

Images