Wheelchair

Abstract

The wheelchair (2) is provided with a back support (24) and a guide (30) which enables the position of the rotation center (PA) of the back support (24) to be fixed relative to a seat surface (18A) and enables the back support (24) to rotate and support the back support (24) in a sliding mode in the length direction. Preferably, the guide (30) includes a support member that slidably supports the back support (24) with a constant distance from the position of the center of rotation of the back support (24) to the seat surface (18A).

Description

[0001] This application claims priority based on Japanese patent application No. 2023-144567 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 Patent Gazette No. 4341885 discloses a reclining wheelchair. The reclining mechanism of the wheelchair includes a frame body, a first link, a second link, and an unequal-side four-section link mechanism pivotally connected to a back support frame. In addition, the reclining mechanism includes an action rod pivotally connected to the first link at one end and a link plate pivotally connected to the other end of the action rod. The other end of the link plate is pivotally connected to the seat frame and the frame body. Moreover, by making the links of the reclining mechanism have a predetermined positional relationship, the wheelchair prevents the backrest (hereinafter also referred to as back support) and the user's back from being offset.

[0004] The wheelchair prevents the positional deviation of the backrest and the backrest by means of a tilt mechanism in which the links are in a predetermined positional relationship.

[0005] The present applicant intends to provide a wheelchair capable of suppressing the positional deviation of the back support and the back with a simple structure. Summary of the invention

[0006] Means of solving the problem: The wheelchair disclosed in this specification has: back support, and The guide member keeps the position of the rotation center of the back support constant relative to the seat surface and supports the back support slidably in the longitudinal direction while rotating the back support.

[0007] The wheelchair can suppress the positional deviation of the back support and the back with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] 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 yes Figure 2 A side view of a frame of a wheelchair; Figure 4 yes Figure 3 A partial enlarged view of Figure 5 is along Figure 4 A partial cross-sectional view of line segment VV; Figure 6 It is shown Figure 1 Side view of the frame of the wheelchair in other usage states; Figure 7 yes Figure 6 A partial enlarged view of Figure 8 It is shown Figure 1 A side view of the frame of the wheelchair in another usage state; Fig. 9 yes Figure 8 A partial enlarged view of Fig.10 is along Figure 4 A partial cross-sectional view of line segment XX; then, Fig.11 is along Figure 4 A partial cross-sectional view of line segment XI-XI. DETAILED DESCRIPTION

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

[0010] 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.

[0011] 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.

[0012] 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. In addition, the length direction of the back support 24 is the extension direction (axial direction) of the back frame 6.

[0013] 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 waist of the user.

[0014] Figure 2FIG. 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. Figure 2 In the figure, the right arm 32 is hidden by the side frame 4 and is not shown.

[0015] 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 lower portion of 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 lower portion of the side frame 4 on the left side. The transverse frame 28 is connected to the pair of side frames 4.

[0016] 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.

[0017] like Figure 1 As shown, the seat 18 is mounted on the seat tube 28A. The seat 18 is located on the side frame 4. The seat 18 forms a seat surface 18A.

[0018] The front wheel 14 is installed in front of the side frame 4. The rear wheel 16 is installed in the rear of the side frame 4.

[0019] Figure 3 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.

[0020] like Figure 3As shown, the wheelchair 2 also has a gas spring 40. The gas spring 40 is arranged between the side frame 4 and the back frame 6 (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, and for example, a telescopic component with an actuator and a mechanical lock may be used instead of the gas spring 40.

[0021] The wheelchair 2 also includes a pair of left and right handles 42 and a pair of left and right levers 44. The handles 42 protrude rearward from the back frame 6, respectively. The levers 44 are mounted on the handles 42. The levers 44 are rotatable. The levers 44 are rotated toward the handles 42, thereby releasing the lock of the gas spring 40. As the lock is released, the lever 40B is movable relative to the cylinder 40A. The lever 44 is urged in a rotation direction away from the handles 42 by an elastic body (not shown). Due to this urging, the lever 44 is separated from the handles 42 in a free state where the hand is separated from the lever 44. As the lever 44 is separated, the lock prevents the movement of the lever 40B relative to the cylinder 40A.

[0022] like Figure 3 As shown, the upper end portion 10A of the waist frame 10 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.

[0023] Figure 4 Show Figure 3 A partial enlarged view of . Figure 4 A portion of the seat 18 is also shown. Figure 4 As shown in FIG. 1 , the guide member 30 includes 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 arrow θV represents the angle formed by the vertical line LV and the axis LB of the back frame 6, that is, 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 upper side of the back frame 6 to the lower side, and is away from the axis LB of the back frame 6. The two-dot chain line LF indicates 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 a roller 10C. The roller 10C is attached to the lower end 10B. The roller 10C is prevented from falling off by the slide groove 30D. The roller 10C is supported by the support surface 30C. The roller 10C can move along the support surface 30C. Thus, the lower end 10B of the waist frame 10 can move relative to the guide 30.

[0026] The guide member 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 mounted on 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 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 located at positions separated from each other in the direction of 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 located at positions separated from each other in the direction of the axis LB of the back frame 6.

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

[0029] The guide member 30 is hinged to the side frame 4. The guide member 30 is rotatable relative to the side frame 4. Symbol PA represents the rotation center of the guide member 30 relative to the side frame 4. The back frame 6 is rotatable relative to the side frame 4 together with the guide member 30. The rotation center PA is also the rotation center of the back frame 6 (back support 24) relative to the side frame 4. Figure 4 The double-headed arrow DS 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 not loose but in a tensioned state.

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

[0031] In the wheelchair 2, Figure 4 As shown, when the back frame 6 is pressed down, the back frame 6 slides relative to the guide 30. Also, 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 together with the guide 30 relative to the side frame 4.

[0032] 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 lower end 10B of the waist frame 10 moves downward along the support surface 30C. 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.

[0033] Figure 5 is along Figure 4 A partial cross-sectional view of the line segment VV. Figure 5 As shown, the cross-sectional shape of the back frame 6 is a hollow circle. The back frame 6 is composed of a hollow tube. In addition, the back frame 6 is not limited to a hollow tube. The back frame 6 can also be a solid round rod. In addition, the cross-sectional shape of the back frame 6 is not limited to a circle. The cross-sectional shape can be, for example, a polygon.

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

[0035] The rotation center of the first guide roller 31A coincides with the rotation 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 direction of the back frame 6 .

[0036] Figure 5 The double arrows G1 and G2 indicate the gap between the first guide roller 31A and the plate 30A. The first guide roller 31A can be adjusted relative to the plate 30A through the gaps G1 and G2. The double arrows G3 and G4 indicate the gap between the second guide roller 31B and the plate 30A. The second guide roller 31B can be adjusted relative to the plate 30A through the gaps G3 and G4.

[0037] Figure 6 Other usage states of the wheelchair 2 are shown. Figure 6 In the middle, the back frame 6 is Figure 3 The use state is tilted. The rotation center PB and Figure 3 Compared with the usage state, it is located in the front.

[0038] Figure 7 Show Figure 6 A partial enlarged view of . Figure 7 A portion of the seat 18 is also shown. The angle of inclination θV of the back support 24 is Figure 4 The first guide roller 31A, the second guide roller 31B, the third guide roller 31C and the fourth guide roller 31D are Figure 4 Compared with the use state of the back frame 6, the upper part of the back frame 6 is supported. The lower end 10B of the waist frame 10 is Figure 4 Compared with the use state, the lower end portion 10B is supported by the lower support surface 30C of the guide member 30. Figure 4 Compared with the use state, it protrudes forward of the back frame 6.

[0039] Figure 8 Still another usage state of the wheelchair 2 is shown. Figure 8 In the middle, the back frame 6 is Figure 6 The use state is further tilted. The rotation center PB and Figure 6 Compared with the usage state, it is further located in the front.

[0040] Fig. 9 Show Figure 8 A partial enlarged view of . Fig. 9 A portion of the seat 18 is also shown. The angle of inclination θV of the back support 24 is Figure 7 The first guide roller 31A, the second guide roller 31B, the third guide roller 31C and the fourth guide roller 31D are Figure 7 Compared with the use state of the back frame 6, the upper part of the back frame 6 is supported. The lower end 10B of the waist frame 10 is Figure 7 Compared with the use state of the guide member 30, the lower end portion 10B is supported by the support surface 30C of the guide member 30. Figure 7 Compared with the use state of the back frame 6, it protrudes further forward.

[0041] Fig.10 is shown along Figure 4 The cross section of the line segment XX. Fig.10 As shown, the side frame 4 has a shaft 4A, a nut 4B, a collar 4C, a pair of collars 4D, a pair of flange bushings 4E, and a collar 4F.

[0042] The shaft 4A is screwed into the nut 4B. The collar 4C is clamped by the nut 4B and the head of the shaft 4A together with the arm support 4G of the side frame 4. Thus, the collar 4C is fixed to the arm support 4G. A pair of collars 4D, a pair of flange bushings 4E, and the collar 4F are mounted together with the arm 32 by being clamped by the arm support 4G.

[0043] The pair of collars 4D is located between the arm support 4G and the arm 32. The flange bushing 4E is located between the collars 4C and 4F and the arm 32. The material of the pair of collars 4D and the pair of flange bushings 4E is, for example, resin.

[0044] Fig.11 Shown along Figure 5 The section of the line segment XI-XI. Fig.11 As shown, the arm 32 has a pair of ends 32A, a shaft 32B, a nut 32C, a collar 32D and a pair of flange bushings 32E.

[0045] The shaft 32B is screwed into the nut 32C. The collar 32D is clamped by the nut 32C and the head of the shaft 32B together with the pair of end portions 32A, and is fixed to the end portions 32A. A pair of flange bushings 32E are embedded in the collar 32D and mounted on the collar 32D. The back frame 6 can rotate with the shaft 32B as a rotation axis.

[0046] The flange bushing 32E is located between the pair of end portions 32A and the back frame 6. Furthermore, the flange bushing 32E is located between the collar 32D and the back frame 6. The material of the pair of flange bushings 32E is, for example, resin.

[0047] Reference Figures 1 to 8 , the reclining action of the wheelchair 2 is described. Here, the user is seated on Figure 1 The usage status of the wheelchair 2 is described below.

[0048] exist Figure 1 In the illustrated position of use, the assistant holds the handle 42 and the rod 44 together. Figure 3 The gas spring 40 shown is unlocked. The gas spring 40 generates a force in the direction that the rod 40B protrudes from the cylinder 40A. The assistant resists this force and presses down the handle 42. The back support 24 is Figure 1 The back support 24 is thereby moved in the longitudinal direction relative to the guide 30 and simultaneously rotated 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 assistant releases the lever 44. The gas spring 40 is locked. As a result, the back support 24 is maintained in an inclined state. The inclined state of the back support 24 can be Figure 6 The usage status can also be Figure 8 usage status.

[0049] Then, for example, in Figure 8On 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 to the back support 24 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 lifting 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 in the lifted state. In this way, for example, the wheelchair 2 becomes Figure 1 usage status.

[0050] In the wheelchair 2, the guide 30 moves and tilts the back frame 6 in the axial direction 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 rotates the back support 24 and supports it slidably along its length direction. The guide 30 moves and tilts the rotation center PB of the arm 32 and the back support 24 relative to the seat surface 18A. The wheelchair 2 can suppress the positional deviation of the user's back and the back support 24 with a simple structure.

[0051] The guide member 30 makes the distance DS (see Figure 4 ) is constant. The guide member 30 includes a first guide roller 31A that slidably supports the back support 24. The guide member 30 can suppress the change in the distance from the seat surface 18A to the back support 24 by the rotation and sliding of the back support 24. In addition, the first guide roller 31A is an example of a supporting member. The supporting member is not particularly limited as long as it can keep the distance DS from the rotation center PA of the back support 24 to the seat surface 18A constant and slidably support the back support 24.

[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 side of the back support 24. The second guide roller 31B and the third guide roller 31C stably support the load on the back support 24. The second guide roller 31B and the third guide roller 31C are examples of supporting members, and are not limited thereto. In addition, the number of supporting members supporting from the rear side may be one or more than three, 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 from the rear at positions separated from each other. The guide 30 can stably support the back support 24 from the rear along the sliding direction. Furthermore, the guide 30 includes a first guide roller 31A and a fourth guide roller 31D that slidably support the back support 24 from the front at positions separated from each other. The guide 30 can stably support the back support 24 from the front along the sliding direction. From the viewpoint of stable support in the sliding direction, it is preferred that the guide 30 includes a supporting member that slidably supports the back support 24 in the same direction at positions separated from each other. In addition, the number of the supporting members is not limited to two, and may be three or more.

[0054] In the guide member 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 laid down, the second guide roller 31B supports the back frame 6. In this way, the wheelchair 2 preferably includes two or more guide rollers 31 that support the back support 24 slidably in different directions. In addition, 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, the wheelchair 2 preferably includes two or more support members that support the back support 24 slidably in different directions.

[0055] The 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 user's back 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 the wheelchair 2, the back frame 6 is slidably supported by the guide 30. The first guide roller 31A has a support surface 31E along the contour of the back frame 6, and the back frame 6 is slidably supported by the support surface 31E. Thus, the first guide roller 31A can slidably support the back support 24 stably. The second guide roller 31B to the fourth guide roller 31D also have the support surface 31E as the first guide roller 31A, and can slidably support the back support 24 stably.

[0057] like Figure 5As shown, the guide member 30 includes a first guide roller 31A and a second guide roller 31B, which clamp the back frame 6 in a direction perpendicular to the axis LB of the back frame 6 and slidably support it. The first guide roller 31A and the second guide roller 31B clamp 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 through the gaps G1 and G2. The second guide roller 31B can move through the gaps G3 and G4. Thus, the first guide roller 31A and the second guide roller 31B can cope with the positional deviation of the back frame 6. The wheelchair 2 is foldable. In the foldable wheelchair 2, positional deviation is likely to occur on the left and right back frames 6 in the use posture. The guide member 30 having the gaps G1 to G4 is suitable for a wheelchair (folding wheelchair) in which the interval between the pair of side frames 4 is variable.

[0059] like Fig.10 As shown, a pair of collars 4D are located between the arm support 4G and the arm 32. The material of the pair of collars 4D is, for example, resin. Thus, between the arm support 4G and the arm 32, the generation of sliding noise between metals is prevented. The flange bushing 4E is located between the collars 4C and 4F and the arm 32. The material of the pair of flange bushings 4E is, for example, resin. Thus, between the collars 4C and 4F and the arm 32, the generation of sliding noise between metals is prevented.

[0060] Again, if Fig.11 As shown, the flange bushing 32E is located between the pair of end portions 32A and the back frame 6 in the axial direction, and between the shaft collar 32D and the back frame 6 in the radial direction. The material of the pair of flange bushings 32E is, for example, resin. Thus, the generation of sliding noise between the metals is prevented between the pair of end portions 32A and the back frame 6, and also between the shaft collar 32D and the back frame 6.

[0061] Furthermore, in the wheelchair 2, by pressing down the back frame 6, the waist frame 10 is also pressed down. Figure 4 As shown, the roller 10C of the waist frame 10 is guided by the support surface 30C of the guide 30 and moves. The roller 10C rolls on the support surface 30C of the guide 30. The roller 10C is made of resin, so the generation of sliding sound between metals is prevented. In addition, the material of the roller 10C is preferably excellent in wear resistance. From this point of view, the material of the roller 10C is preferably polyacetal, for example.

[0062] In addition, from the viewpoint of preventing the occurrence of sliding noise between metals, the guide roller 31 of the wheelchair 2 is preferably made of resin like the roller 10C. In addition, from the viewpoint of wear resistance, the material of the guide roller 31 is preferably polyacetal.

[0063] [Public form] The following aspects disclose preferred embodiments, respectively.

[0064] [Form 1] A wheelchair having: back support, and The guide member keeps the position of the rotation center of the back support constant relative to the seat surface and supports the back support slidably in the longitudinal direction while rotating the back support.

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

[0066] [Form 3] According to the wheelchair described in aspect 1 or 2, the guide includes a support member that slidably supports the back support from behind the back support.

[0067] [Form 4] According to the wheelchair described in any one of aspects 1 to 3, the guide includes two or more supporting members, and the two or more supporting members support the back support slidably in different directions.

[0068] [Form 5] According to the wheelchair described in any one of aspects 1 to 4, 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] [Form 6] According to the wheelchair described in any one of aspects 1 to 5, the back support has a back frame slidably supported by the guide member, The guide includes a support member having a support surface along the contour of the back frame and slidably supporting the back frame through the support surface.

[0070] [Form 7] According to the wheelchair described in any one of aspects 1 to 6, the back support has a back frame slidably supported by the guide member, The guide includes a support member that slidably supports the back frame by sandwiching the back frame in a direction orthogonal to the axis of the back frame.

[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: back support, and The guide member keeps the position of the rotation center of the back support constant relative to the seat surface and supports the back support slidably in the longitudinal direction while rotating the back support.

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

3. The wheelchair according to claim 1 or 2, characterized in that: The guide includes a supporting member that slidably supports the back support from behind the back support.

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

5. The wheelchair according to claim 1 or 2, characterized in that: 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 wheelchair according to claim 1 or 2, characterized in that: The back support has a back frame slidably supported by the guide, The guide includes a support member having a support surface along the contour of the back frame and slidably supporting the back frame through the support surface.

7. The wheelchair according to claim 1 or 2, characterized in that: The back support has a back frame slidably supported by the guide, The guide includes a support member that slidably supports the back frame by sandwiching the back frame in a direction orthogonal to the axis of the back frame.

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