Wheelchair with adjustable seat width

Abstract

The invention relates to a wheelchair, in particular to a wheelchair with adjustable seat width. The wheelchair provided by the invention has the characteristics that the adjustment of the width of the seat of the wheelchair is discontinuous, and the width adjustment or the narrowing adjustment of each time is determined by the size of the cushion block in the left-right direction, so that a user can easily adjust the width of the seat of the wheelchair to an appropriate size according to the specifications of a back cushion and a seat cushion. The structure based on the adjusting mode of the position of the movable cushion block is simple, the manufacturing difficulty is low, and the production cost is saved.

Description

Technical Field

[0001] The invention relates to a wheelchair, in particular to a wheelchair with adjustable seat width. Background Art

[0002] The seat of a wheelchair is relatively hard, and the comfort of sitting directly on it is relatively poor, so a cushion is usually set on the seat to improve the riding comfort. Some wheelchairs also have a back cushion used in conjunction with the seat cushion, and the wheelchair occupant leans on the back cushion to further improve the riding comfort.

[0003] Because the wheelchair occupant grows taller, gains weight or wears more clothes, the originally suitable cushions and seat cushions may no longer be suitable. At this time, they need to be replaced with wider cushions and seat cushions. In order to accommodate the wider cushions and seat cushions, the seat width of the wheelchair needs to be adjusted to make the seat wider to adapt to the new cushions and seat cushions. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to make the seat width of the wheelchair adjustable so that it can accommodate wider back cushions and seat cushions.

[0005] To solve the technical problem, the present invention provides a wheelchair with adjustable seat width, comprising a seat frame, the seat frame comprising a seat plate frame and a backrest frame; the backrest frame comprises at least two backrest brackets, one left and one right, and the left and right sides of the backrest are respectively fixed to the two backrest brackets; the two backrest brackets are each connected to the seat plate frame via a connecting bracket, the seat frame also comprises at least two groups of first pads and two groups of first fasteners, the two connecting brackets are each fixed to the seat plate frame in a detachable manner together with at least one group of first pads via a group of first fasteners, and the distance between the connecting bracket and the seat plate frame is increased by one level by replacing a group of first pads from the outside of the connecting bracket to between the connecting bracket and the seat plate frame; the backrest bracket moves with the corresponding connecting bracket, and the backrest width is adjustable, or the backrest is fixedly connected to the backrest bracket in a detachable manner to make the backrest replaceable.

[0006] The wheelchair provided by the present invention is characterized in that the adjustment of the width of the wheelchair seat is discontinuous, and the amount of each adjustment is determined by the size of the pad along the left and right direction, so that the user can easily adjust the width of the wheelchair seat to a suitable size according to the specifications of the back cushion and the seat cushion. The structure based on this adjustment method of the position of the movable pad is also relatively simple and has low manufacturing difficulty, which is beneficial to saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figures 1 to 3 This is a three-dimensional view of a wheelchair according to an embodiment of the present invention. Figure 2 Compared to Figure 1 Hidden seat and back cushions. Figure 3 Compared to Figure 2 The housing that conceals the right handrail; Figures 4 to 6 They are Figure 2 Exploded diagrams of A, B, and C shown; Figure 7 for Figure 2 Exploded view at C and D shown; Figure 8 for Figure 2 Exploded view at F and F' shown; Fig. 9 and Fig.10 They are Figure 1 A three-dimensional view of the core of the wheelchair shown before adjustment and after adjustment to one level of width; Fig.11 This is a three-dimensional view of the core part of the wheelchair of the second embodiment of the present invention after being adjusted to two levels of width. DETAILED DESCRIPTION Embodiment 1

[0008] See also Figure 1 A wheelchair, on which a seat cushion 100 and a back cushion 200 are detachably mounted, after the seat cushion 100 and the back cushion 200 are removed, the wheelchair is Figure 2 shown.

[0009] See also Figure 2 and 3 In order to better adapt to the different sizes of seat cushions 100 and back cushions 200, the adjustment of the wheelchair seat width involves six positions or seven positions on each side, and the seven positions A to G on the left side of the wheelchair are Figure 2 It is marked in the figure that the seven positions from A' to G' on the right side of the wheelchair are Figure 3 It is marked in the figure that the structures of the seven positions from A to G on the left side of the wheelchair are mirror-symmetrical with the structures of the seven positions from A' to G' on the right side of the wheelchair. Figure 3 In order to better show the structure at B', a part of the shell at B' used to improve the appearance is hidden. Figures 4 to 8 The adjustment methods at A to G are explained one by one.

[0010] See also Figure 4The structure at A realizes the adjustment of the pedal position. The pedal body 300 is installed on the connecting member 4, and the connecting member 4 is inserted into the seat frame 1. The seat frame 1 and the connecting member 4 are locked and fixed by a second locking assembly consisting of a locking screw 42 and a locking insert 41. The locking insert 41 is embedded in the track 43 of the connecting member 4. The locking screw 42 is inserted into the seat frame 1 and is threadedly connected with the locking insert 41. The locking insert 41 is loosened by slightly loosening the locking screw 42, and the lock is released. The locking insert 41 and the track 43 can move relative to each other, so that the connecting member 4 can move left and right relative to the seat frame 1. In order to prevent the connecting member 4 from being pulled out of the seat frame 1, a limit block 44 for blocking the locking insert 41 is also fixed in the track 43. After the connecting member 4 is pulled out to a certain position, the limit block 44 will block the limit block 44. In other embodiments of the present invention, the footrest position can be designed to be non-adjustable, and sufficient margin is designed during the design so that the footrest will not interfere with the maximum size of the seat cushion 100.

[0011] See also Figure 5 The armrest position adjustment is realized by the structure at B. The armrest includes an armrest body 400, an adjustment component 5 and a shell 53. The adjustment component 5 is installed on the armrest body 400. The shell 53 wraps the adjustment component 5. The shell 53 is composed of two upper and lower lobes and a back cover 531. The upper and lower lobes of the shell 53 are respectively fixedly connected to the adjustment component 5 in a detachable manner. The armrest is detachably fixed to the seat frame 1 together with two sets of third pads through a set of third fasteners. A set of third pads includes two third pads 51 arranged opposite to each other, and a set of third fasteners includes four screws 52. By moving a set of third pads from the outside of the adjustment component 5 in the shell 53 into between the outer back cover 531 and the seat frame 1, the distance between the armrest and the seat frame 1 is increased by one level.

[0012] It can be seen that the third pad 51 is provided with a "U"-shaped through slot matching the screw 52, ​​and the screw 52 passes through the third pad 51 through the "U"-shaped through slot, so that the third pad 51 can be disassembled and assembled in a direction perpendicular to the axis of the screw 52. Before adjusting the position of the armrest, the screws used to fix the housing 53 on the adjustment component 5 must be removed first, and the upper and lower halves of the housing 53 must be separated to expose the adjustment component 5, the third pad 51 and the screw 52, ​​and then the screw 52 is slightly loosened to loosen the third pad 51. At this time, one or two groups of third pads can be removed, the armrest can be moved, and the relative position relationship between the armrest and the two groups of third pads can be changed (for example, one group of third pads 51 can be moved between the rear cover 531 and the seat frame 1), and the screws 52 can be re-tightened to complete the adjustment of the armrest position. In other embodiments of the present invention, the position of the armrest can be designed to be non-adjustable, and sufficient margin is designed during the design so that the armrest will not interfere with the maximum size of the seat cushion 100.

[0013] See also Figure 6, what is achieved at C is the adjustment of the position of the connecting bracket 3. The connecting bracket 3 is fixed to the seat frame 1 in a detachable manner together with two sets of first cushion blocks through a set of first fasteners, a set of first fasteners including four screws 32, and a set of first cushion blocks including two first cushion blocks 31 arranged opposite to each other. By replacing a set of first cushion blocks from the outside of the connecting bracket 3 to between the connecting bracket 3 and the seat frame 1, the distance between the connecting bracket 3 and the seat frame 1 is increased by one level.

[0014] The function of the connecting brackets 3 and 3' is to connect the seat frame 1 and the backrest frame 2. The seat frame 1 is basically a square structure, and the seat 11 is fixed on the seat frame 1. The backrest frame 2 includes at least two symmetrically arranged backrest brackets 21 and 21', and the two backrest brackets 21 and 21' are connected to the seat frame 1 through the connecting brackets 3 and 3' respectively. Since the backrest brackets 21 and 21' are to move with the connecting brackets 3 and 3' respectively, the left and right sides of the backrest 500 are respectively fixed to the two backrest brackets 21 and 21' in a detachable manner, so that the backrest 500 is replaceable, thereby adapting to the change in the distance between the two backrest brackets 21 and 21'. In other embodiments of the present invention, a backrest with adjustable width can also be used, so that the backrest does not need to be fixedly connected to the backrest bracket in a detachable manner.

[0015] In addition to the first cushion block 31 and the screw 32, the C position also involves a group of positioning pins and a group of decorative covers, wherein the group of positioning pins includes four positioning pins 33, and the group of decorative covers includes two decorative covers 34. The positioning pins 33 are mainly used to make the structure of the C position more stable, and also facilitate the installation of the connecting bracket 3 and the first cushion block 31. The decorative cover 34 is used for decoration.

[0016] See also Figure 7 The backrest frame 2 also includes an upper crossbar 22 and a lower crossbar 23. The existence of the upper crossbar 22 and the lower crossbar 23 can improve the stability of the backrest frame 2 structure and provide installation positions for the headrest, gas spring, etc. The D and E positions are respectively used to adjust the position of the backrest bracket 21 relative to the lower crossbar 23 and the upper crossbar 22 to adapt to the adjustment made at the C position.

[0017] At D, the lower cross bar 23 is fixed to the corresponding backrest bracket 21 in a detachable manner together with two sets of second pads through a set of second fasteners, a set of second fasteners includes a screw 232, a set of second pads includes a second pad 231, and the size of the second pad 231 along the left-right direction is the same as that of the first pad 31. By moving a set of second pads from the outside of the backrest bracket 21 into between the backrest bracket 21 and the lower cross bar 23, the spacing between the lower cross bar 23 and the backrest bracket 21 can be adapted to the outward movement of the backrest bracket 21 and become larger by one level. The size of the third pad 51 at B mentioned above along the left-right direction is also the same as that of the first pad 31, so that B, C and D can adapt to the size changes of the cushion 200 and the seat cushion 100 and change uniformly.

[0018] At E, the end of the upper cross bar 22 passes through the backrest bracket 21. The backrest bracket 21 is provided with a first locking assembly. After the first locking assembly is released, the backrest bracket 21 can move left and right along the upper cross bar 22 to adapt to the displacement of the backrest bracket 21 caused by the adjustment at C. The first locking assembly includes two screws 221 and two corresponding nuts. The backrest bracket 21 is mainly composed of three parts, namely a vertical rod roughly along the up and down direction and an extension frame respectively arranged at both ends of the vertical rod. The extension frame at the upper end of the vertical rod is composed of two parts. The two parts are connected together by the first locking assembly. The tightness of the clamping of the two parts on the upper cross bar 22 can be adjusted by loosening the tightening screws 221. After loosening, the backrest bracket 21 can move relative to the upper cross bar 22.

[0019] B, C, and D all use a movable pad adjustment method. The specific structures of the pads at these three locations are different. When implementing the present invention, those skilled in the art can select the same or different pad structures for these three locations as needed.

[0020] See also Figure 8 and 9 At F, the wheel position is adjusted. The seat frame 1 is mounted on the base frame 6, the base frame 6 is located below the seat frame 1, and the two wheels 600 and 600' are located on the left and right sides of the base frame 6 respectively. At F, the wheel 600 is mounted on the wheel seat 61 (see Figure 3), the wheel seat 61 is fixed to the mounting seat 62 by two fourth fasteners (screws 63), the mounting seat 62 is fixed to the base frame 6, and the coupling surface between the wheel seat 61 and the mounting seat 62 is a wavy surface running in the left-right direction to increase the resistance that needs to be overcome for the wheel seat 61 and the mounting seat 62 to have a relative displacement in the left-right direction. After the lock of the fourth fastener is released, the wheel seat 61 can move relative to the mounting seat 62, so that the distance between the wheel 600 and the base frame 6 can be adjusted to adapt to the changes in the body shape of the wheelchair occupant. A strip hole 611 is provided on the wheel seat 61 corresponding to the fourth fastener. The fourth fastener passes through the strip hole 611 and is threadedly connected to the mounting seat 62. The strip hole 611 cooperates with the fourth fastener to guide the left-right movement of the wheel seat 61 relative to the mounting seat 62.

[0021] The left and right wheel seats 61, 61' are connected by a strip-shaped connecting piece 64 to ensure the consistency of the positions of the two wheels 600, 600' in the front-rear direction.

[0022] The wheelchair further comprises two brake assemblies 65, 65', which are respectively mounted on the left and right sides of the base frame 6. The wheelchair occupant turns the handles of the brake assemblies 65, 65' to make the brake rods of the brake assemblies 65, 65' abut against the wheels 600, 600' to achieve braking. Fig. 9 and 10 , what is achieved at G is the adjustment of the position of the brake assembly. The brake assembly 65 is fixed to the base frame 6 in a detachable manner together with the fourth pads 652a and 652b by three fifth fasteners (screws 651). The fourth pad 652a is passed through two screws 651, and the fourth pad 652b is passed through one screw 651. By moving the fourth pads 652a and 652b from the outside of the brake assembly 65 into between the brake assembly 65 and the base frame 6, the distance between the brake assembly 65 and the base frame 6 is increased by one level. Although the position of the brake assembly 65 in this embodiment has only two levels and the position of the wheel seat 61 has three levels, the length of the brake rod is sufficient. Move the wheel seat 61 from Fig. 9 Move outward one notch to the position shown Fig.10 When the brake assembly 65 is in the position shown, Fig. 9 Move outward one notch to the position shown Fig.10 Position as shown. Fig.10 Move outward one notch to the position shown Fig.11 In the position shown, the position of the brake assembly 65 is not adjusted.

[0023] Fig.10 Compared to Fig. 9 The six positions A, C to G on the left side of the wheelchair and the six positions A', C' to G' on the right side of the wheelchair are all adjusted outward by one level, and the backrest 500 is replaced with a wider one accordingly. Embodiment 2

[0024] The difference between the wheelchair of this embodiment and the first embodiment is the backrest, see Fig.11 The backrest 500-1 of the wheelchair in this embodiment is adjustable in width. The backrest 500-1 is divided into two left and right pieces, each of which is provided with a buckle and a strap. The strap is inserted into the buckle and the buckle is tightened to fix the strap.

Claims

1. A wheelchair with adjustable seat width, comprising a seat frame, the seat frame comprising a seat plate frame (1) and a backrest frame (2); the backrest frame (2) comprising at least two backrest brackets (21), one on the left and one on the right, the left and right sides of the backrest (500) being fixed to the two backrest brackets (21) respectively; characterized in that: The two backrest brackets (21) are each connected to the seat frame (1) via a connecting bracket (3). The seat frame further comprises at least two groups of first cushion blocks (31) and two groups of first fasteners (32). The two connecting brackets (3) are each fixed to the seat frame (1) together with at least one group of first cushion blocks (31) in a detachable manner via a group of first fasteners (32). By replacing a group of first cushion blocks (31) from the outside of the connecting bracket (3) to between the connecting bracket (3) and the seat frame (1), the distance between the connecting bracket (3) and the seat frame (1) is increased by one level. The backrest bracket (21) moves with the corresponding connecting bracket (3), and the width of the backrest (500) is adjustable. Alternatively, the backrest (500) is fixedly connected to the backrest bracket (21) in a detachable manner, and the backrest (500) is replaceable.

2. The wheelchair according to claim 1, characterized in that: The backrest frame (2) further comprises a lower cross bar (23), at least two groups of second cushion blocks (231) and two groups of second fasteners (232); the number of groups of the second cushion blocks (231) and the size in the left-right direction are the same as those of the first cushion blocks (31); the lower cross bar (23) is arranged between the two backrest brackets (21) in the left-right direction; the left and right ends of the lower cross bar (23) are respectively fixed to the corresponding backrest bracket (21) in a detachable manner together with at least one group of second cushion blocks (231) through a group of second fasteners (232); by moving a group of second cushion blocks (231) from the outside of the backrest bracket (21) into between the backrest bracket (21) and the lower cross bar (23), the distance between the lower cross bar (23) and the backrest bracket (21) can be adapted to the outward movement of the backrest bracket (21) and become larger by one level.

3. The wheelchair according to claim 1 or 2, characterized in that: The backrest frame (2) further comprises an upper cross bar (22) which is arranged in the left-right direction, and the left and right ends of the upper cross bar (22) respectively pass through the two backrest brackets (21); a first locking assembly is provided on the backrest bracket (21); after the first locking assembly is unlocked, the backrest bracket (21) can move left and right along the upper cross bar (22).

4. The wheelchair according to claim 1 or 3, characterized in that: The wheelchair further comprises two armrests, at least two groups of third pads (51) and two groups of third fasteners (52); the two armrests are respectively located on the left and right sides of the seat frame (1), and are each fixed to the seat frame (1) in a detachable manner together with at least one group of third pads (51) via a group of third fasteners (52); and the distance between the armrest and the seat frame (1) is increased by one level by moving a group of third pads (51) from the outside of the armrest into between the armrest and the seat frame (1).

5. The wheelchair according to claim 4, characterized in that: The third fastener (52) is a screw, and the third cushion block (51) is provided with a "U"-shaped through slot matching the third fastener (52). The third fastener (52) passes through the third cushion block (51) through the "U"-shaped through slot, so that the third cushion block (51) can be disassembled and assembled in a direction perpendicular to the axis of the third fastener (52).

6. The wheelchair according to claim 1 or 4, characterized in that: The wheelchair further comprises a base frame (6), two wheels (600), two wheel seats (61) and two mounting seats (62); the seat plate frame (1) is mounted on the base frame (6), the base frame (6) is located below the seat plate frame (1), and the two wheels (600) are respectively located on the left and right sides of the base frame (6); the wheels (600) are mounted on the wheel seats (61), the wheel seats (61) are fixed to the mounting seats (62) via fourth fasteners (63), and the mounting seats (62) are fixed to the base frame (6); after the locking of the fourth fasteners (63) is released, the wheel seats (61) can move relative to the mounting seats (62), so that the distance between the wheels (600) and the base frame (6) can be adjusted; the coupling surface between the wheel seats (61) and the mounting seats (62) is a wavy surface extending in the left-right direction, so as to increase the resistance that needs to be overcome when the wheel seats (61) and the mounting seats (62) are relatively displaced in the left-right direction.

7. The wheelchair according to claim 6, characterized in that: The fourth fastener (63) is a screw. A strip hole (611) is provided on the wheel seat (61) corresponding to the fourth fastener (63). The fourth fastener (63) passes through the strip hole (611) and is threadedly connected to the mounting seat (62). The strip hole (611) and the fourth fastener (63) cooperate to guide the left-right movement of the wheel seat (61) relative to the mounting seat (62).

8. The wheelchair according to claim 6, characterized in that: The wheelchair further comprises two brake assemblies (65), two groups of fifth fasteners (651) and at least two groups of fourth pads (652a, 652b); the two brake assemblies (65) are respectively located on the left and right sides of the base frame (6), and are each fixed to the base frame (6) in a detachable manner together with at least one group of fourth pads (652a, 652b) via a group of fifth fasteners (651); and the distance between the brake assembly (65) and the base frame (6) is increased by one level by moving a group of fourth pads (652a, 652b) from the outside of the brake assembly (65) into between the brake assembly (65) and the base frame (6).

9. The wheelchair according to claim 1 or 6, characterized in that: The wheelchair further comprises two footrests, the footrests comprising a footrest body (300) and a connecting piece (4), the footrest body (300) being mounted on the connecting piece (4); the two connecting pieces (4) are respectively inserted into the seat frame (1) from the left and right sides of the seat frame (1), the seat frame (1) and the connecting pieces (4) are locked and fixed by a second locking assembly, and after the second locking assembly is unlocked, the connecting piece (4) can move left and right relative to the seat frame (1).

10. The wheelchair according to claim 9, characterized in that: The second locking assembly comprises a locking screw (42) and a locking insert (41), wherein the locking insert (41) is embedded in the connecting member (4), and the locking screw (42) is inserted into the seat plate frame (1) and is threadedly connected to the locking insert (41).

11. The wheelchair according to claim 1, characterized in that: A positioning pin (33) is provided on the seat plate frame (1) corresponding to the first cushion block (31); the positioning pin (33) passes through the connecting bracket (3) and the first cushion block (31) and has a positioning function for the installation of the first cushion block (31) and the connecting bracket (3).

Images