Wheelchair

Abstract

The utility model belongs to the technical field of wheelchairs, and particularly relates to a wheelchair which comprises two sets of side frames, supporting wheels are arranged on the two sets of side frames respectively, a connecting rod device is arranged between the two sets of side frames, the two sets of side frames draw close relatively to drive the connecting rod device to be folded, and the connecting rod device comprises two rod bodies hinged to form an X shape. Connecting seats are detachably arranged at the two ends of the rod body respectively, the connecting seat at one end of the rod body is rotationally connected with the side frame, a supporting cross rod used for supporting a cushion is detachably arranged on the connecting seat at the other end of the rod body, the connecting seats, the rod body and the supporting cross rod are connected through fasteners to form an L-shaped or T-shaped structure, and a transmission connecting rod is rotationally arranged on the rod body. The side frame, the transmission connecting rod and the two rod bodies are sequentially and rotationally connected to form a four-rod mechanism, the side frame can support the supporting cross rod and enable the connecting rod device to be kept in an unfolded state, and the wheelchair is convenient to produce and machine and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of wheelchair, especially relates to a wheelchair. BACKGROUND

[0002] Wheelchair is a chair with wheels that can help replace walking, and is an important mobile tool for the sick, the sick, the disabled, home rehabilitation, turnover transportation, medical treatment and outdoor activities.

[0003] In order to facilitate the storage and carrying of wheelchair, most of the wheelchair can be folded, and the traditional wheelchair mainly comprises side frames arranged on the left and right sides, wheels arranged outside the side frames, a foldable support seat arranged between the side frames, and a seat cushion arranged on the support seat, such as a novel folding electric wheelchair disclosed in Chinese utility model patent CN202322827644.5, which comprises a left wheelchair support, a right wheelchair support and a battery with a circuit board control system, the left and right wheelchair supports are connected to the support plates at the rear lower part through the rotating shafts, the two inverted U-shaped clamping plates inside the battery are respectively clamped with the ends of the two support plates, the support bracket bears the bottom surface of the battery, so that the battery supports the two support plates horizontally to keep the left and right wheelchair supports unfolded, and the two support plates support the stability of the user when the left and right wheelchair supports are used, or by removing the battery, the support plates lose the support force of the battery, and the left and right wheelchair supports move inward, the support rods between the left and right wheelchair supports rotate through the pin shafts, the left and right wheelchair supports are attached, and the purpose of quickly disassembling and folding the wheelchair is achieved.

[0004] The inclined support rod and the seat rod in the above structure are welded together during production, but the workpiece is not uniformly heated during welding, which can easily cause changes in the shape and size of the workpiece, affecting the appearance of the wheelchair, and affecting the cooperation of the seat rod and the buckle, and even if there is a problem during welding, the welding position is also prone to deformation or rust after long-term use, affecting the service life of the wheelchair. SUMMARY

[0005] In order to overcome the defects in the prior art, the utility model aims at providing a wheelchair which is convenient to produce and process and has a long service life.

[0006] The utility model aims at realizing the following:

[0007] A wheelchair comprises two groups of side frames, each of which is provided with a support wheel. A connecting rod device is provided between the two groups of side frames. The two groups of side frames are brought closer together to drive the connecting rod device to fold. The connecting rod device comprises two rod bodies hinged in an X shape, each end of the rod body is detachably provided with a connecting seat, the connecting seat at one end of the rod body is rotatably connected to the side frame, and a supporting cross bar for supporting a seat cushion is detachably provided on the connecting seat at the other end of the rod body. Fasteners connect the connecting seat, the rod body and the supporting cross bar to form an L-shaped or T-shaped structure, and a transmission connecting rod is rotatably provided on the rod body. The side frames, the transmission connecting rod and the two rod bodies are rotatably connected in sequence to form a four-bar mechanism. The side frames can support the supporting cross bar and keep the connecting rod device in an expanded state.

[0008] The utility model is further configured as follows: a support seat is detachably provided on the upper side of the side frame, the side frame supports the support cross bar through the support seat, and an elastic card slot is provided on the support seat, and the support cross bar cooperates with the elastic card slot to relatively fix the support cross bar and the side frame.

[0009] The utility model is further configured as follows: the rod body is tubular, the connecting seat is provided with an inserting portion inserted in the rod body and a tightening portion for abutting against the side wall of the rod body, the fastener penetrates the rod body and is connected to the inserting portion, thereby fixing the connecting seat and the rod body relatively.

[0010] The utility model is further configured as follows: a mounting hole is provided on the connecting seat, the supporting cross bar is passed through the mounting hole, and a first fixing groove for installing a nut is provided on one side of the mounting hole, and the first fixing groove can limit the relative rotation of the nut; the bolt passes through the mounting hole and the supporting cross bar and cooperates with the nut in the first fixing groove, so that the connecting seat and the supporting cross bar are relatively fixed.

[0011] The utility model is further configured as follows: the side frame is detachably provided with a first hinge seat and a second hinge seat through fasteners, the connecting seat and the transmission connecting rod are rotatably connected to the side frame through the first hinge seat and the second hinge seat respectively, and the first hinge seat and the second hinge seat are both provided with a second fixing groove for installing a nut, and the second fixing groove can limit the relative rotation of the nut; the bolt passes through the side frame and cooperates with the nut in the fixing groove, so that the first hinge seat or the second hinge seat is relatively fixed to the side frame.

[0012] The utility model is further configured as follows: two groups of first articulated seats are provided on the side frame, a rotating shaft is provided between the two groups of first articulated seats, the rotating shaft is fixedly connected to the connecting seat, the rotating shaft and the supporting cross bar on the two rod bodies are assembled in reverse, and at least two groups of fixing holes for installing the second articulated seats are provided on the side frame, and the second articulated seats connected to the transmission connecting rods on the two rod bodies are respectively installed on the side frame through different groups of fixing holes.

[0013] The utility model is further configured as follows: a foot pedal is provided between the two groups of side frames, and a rotating seat and a fixed slot are respectively provided on the foot pedal; the rotating seat is rotatably connected to one group of side frames, and the fixed slot is detachably connected to the other group of side frames; the fixed slot is connected to the side frame to limit the relative approach of the two groups of side frames and prevent the connecting rod device from folding relative to each other.

[0014] The utility model is further configured as follows: the side frame extends forward to form a mounting rod, an extension rod is slidably provided on the mounting rod, the two groups of side frame upper end extension rods are respectively connected to the rotating seat and the fixed slot, the extension rod has multiple fixed positions, and when the mounting rod is installed in different fixed positions, the vertical distance between the foot pedal and the supporting cross bar is different.

[0015] The utility model is further configured as follows: the support wheel includes a main wheel arranged at the rear of the side frame and a universal wheel arranged at the front of the side frame; the side frame extends forward to form a fixed rod; a mounting seat is fixedly provided on the fixed rod; the universal wheel is rotatably provided on the mounting seat; and an auxiliary connecting rod is fixedly provided between the mounting seat and the mounting rod.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. In the present invention, the connecting seat, the rod body and the supporting cross bar are connected to form an L-shaped or T-shaped structure by fasteners, and the rod body and the supporting cross bar are not fixed by welding, thereby avoiding deformation or corrosion of the rod body and the supporting cross bar during production and processing. The rod body and the supporting cross bar are mostly made of tubes. The structure of the connecting seat is conducive to improving the connection strength between the rod body and the supporting cross bar, which is conducive to extending the service life of the wheelchair. The setting of the connecting seat is also conducive to the positioning and installation of the rod body and the supporting cross bar, avoiding the deviation and misalignment of the rod body and the supporting cross bar, and making it convenient for manufacturers to flexibly assemble rod bodies and supporting cross bars of different specifications according to needs, thereby facilitating the production and processing of wheelchairs.

[0018] 2. The arrangement of the support seat and the elastic card slot in the present invention facilitates the positioning connection of the support cross bar and the side frame, avoids the support cross bar and the side frame from being skewed and misaligned during use, is beneficial to the stable deployment of the wheelchair, and can avoid accidental folding of the wheelchair during use, making it convenient for the user to use; the arrangement of the plug-in part and the tightening part is beneficial to the stable connection between the connecting seat and the rod body, reduces or even avoids the relative shaking of the connecting seat and the rod body, and this structure is beneficial to improving the connection strength between the connecting seat and the rod body, avoiding damage to the connection position between the connecting seat and the rod body.

[0019] 3. The setting of the mounting hole in the present invention is conducive to increasing the contact area between the connecting seat and the supporting cross bar, avoiding stress concentration that may cause deformation or damage to the connecting seat and the supporting cross bar. The setting of the first fixing groove facilitates the positioning and installation of the nut, and is convenient for the user to fix the supporting cross bar and the connecting seat relatively through fasteners.

[0020] 4、The first hinged seat and the second hinged seat detachably arranged through the fastener are favorable for the positioning installation of the first hinged seat and the second hinged seat, avoid the position deflection of the first hinged seat and the second hinged seat on the side frame caused by the welding position deflection or the rod body deformation in the production process, are favorable for the assembly production of the wheelchair, and the structure is convenient for the producer to flexibly adjust the first hinged seat and the second hinged seat according to needs, and the flexible production and assembly of the wheelchair are convenient.

[0021] 5、The foot pedal is rotatably connected and clamped with the two groups of side frames, the two groups of side frames are prevented from approaching each other in use, and the stable unfolding of the wheelchair is favorable; the installation rod and the extension rod are arranged, the vertical distance between the foot pedal and the supporting horizontal rod can be adjusted according to needs, and the comfort of the wheelchair is favorable; the universal wheel is arranged, the flexible steering of the wheelchair is favorable, and the auxiliary connecting rod is arranged, and the installation strength of the mounting seat is favorable, and the side frame deformation caused by the excessive load of the wheelchair is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the utility model;

[0023] Figure 2 is an explosion schematic view of the utility model;

[0024] Figure 3 is a structural schematic view of the side frame in the utility model;

[0025] Figure 4 is a partial sectional view of the installation structure of the first hinged seat on the side frame in the utility model;

[0026] Figure 5 is a structural schematic view of the extension rod in the utility model;

[0027] Figure 6 is a connection structure schematic view of the rod body, the supporting horizontal rod, the connecting seat and the rotating shaft in the utility model;

[0028] Figure 7 is a sectional view of the connecting structure of the rod body, the supporting horizontal rod and the connecting seat in the utility model;

[0029] Figure 8 is a structural schematic view of the supporting horizontal rod in the utility model;

[0030] Figure 9 is a structural schematic view of the foot pedal in the utility model.

[0031] Meaning of the numbers in the figure: 1-side frame; 11-mounting rod; 12-fixing rod; 13-auxiliary connecting rod; 14-mounting seat; 15-extension rod; 16-support seat; 17-second hinge seat; 18-first hinge seat; 19-insertion hole; 111-fixing hole; 112-bolt; 113-nut; 114-washer; 151-fixing position; 161-elastic slot; 171-second fixing slot; 172-positioning slot; 2-support wheel; 21-main wheel; 22-universal wheel;

[0032] 23- auxiliary wheel assembly; 3- connecting rod device; 31- rod body; 32- connecting seat; 33- rotating shaft; 321- plug-in portion; 322- tightening portion; 323- mounting hole; 324- first fixing slot; 4- supporting cross bar; 41- bolt hole; 5- transmission connecting rod; 6- foot pedal; 61- rotating seat; 62- fixing slot. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific embodiments of the present invention:

[0034] See also Figures 1 to 9 As shown, a wheelchair comprises two groups of side frames 1, each of which is provided with a support wheel 2, and a connecting rod device 3 is provided between the two groups of side frames 1. The two groups of side frames 1 are relatively close to each other to drive the connecting rod device 3 to fold, and the connecting rod device 3 comprises two hinged rod bodies 31 in an X shape, and each end of the rod body 31 is detachably provided with a connecting seat 32, and the connecting seat 32 at one end of the rod body 31 is rotatably connected to the side frame 1, and a supporting cross bar 4 for supporting a seat cushion is detachably provided on the connecting seat 32 at the other end of the rod body 31, and a fastener connects the connecting seat 32, the rod body 31 and the supporting cross bar 4 to form an L-shaped or T-shaped structure, and a transmission connecting rod 5 is rotatably provided on the rod body 31, and the side frame 1, the transmission connecting rod 5 and the two rod bodies 31 are rotatably connected in sequence to form a four-bar mechanism, and the side frame 1 can be rotated. The support cross bar 4 supports and keeps the connecting rod device 3 in an expanded state. In this structure, the connecting seat 32, the rod body 31 and the support cross bar 4 are connected by fasteners to form an L-shaped or T-shaped structure. The rod body 31 and the support cross bar 4 are not fixed by welding, so as to avoid deformation or corrosion of the rod body 31 and the support cross bar 4 during the production and processing. The rod body 31 and the support cross bar 4 are mostly made of tubes. The structure of the connecting seat 32 is conducive to improving the connection strength between the rod body 31 and the support cross bar 4, which is conducive to extending the service life of the wheelchair. The setting of the connecting seat 32 is also conducive to the positioning and installation of the rod body 31 and the support cross bar 4, avoiding the deviation and misalignment of the rod body 31 and the support cross bar 4, and making it convenient for manufacturers to flexibly assemble rod bodies 31 and support cross bars 4 of different specifications according to needs, which is convenient for the production and processing of wheelchairs.

[0035] In the present invention, multiple groups of connecting rod devices 3 can be provided between the two groups of side frames 1, but it is not possible to provide only one group of connecting rod devices 3 between the two groups of side frames 1 in the drawings of the utility model specification.

[0036] The upper side of the side frame 1 is detachably provided with a support seat 16, the side frame 1 supports the support cross rod 4 through the support seat 16, and the support seat 16 is provided with an elastic clamping groove 161, the support cross rod 4 is matched with the elastic clamping groove 161 to fix the support cross rod 4 relative to the side frame 1, the arrangement of the support seat 16 and the elastic clamping groove 161 facilitates the positioning connection of the support cross rod 4 and the side frame 1, avoids the inclination and misplacement of the support cross rod 4 and the side frame 1 during use, is beneficial to the stable unfolding of the wheelchair, and can avoid the accidental folding of the wheelchair during use, facilitates the use of users, and the support seat 16 is provided with a U-shaped connecting part in the embodiment.

[0037] The rod body 31 is tubular, the connecting seat 32 is provided with a plug-in part 321 inserted in the rod body 31 and an abutting part 322 abutting against the side wall of the rod body 31, the fastener penetrates the rod body 31 and is connected with the plug-in part 321, so that the connecting seat 32 is relatively fixed with the rod body 31, the arrangement of the plug-in part 321 and the abutting part 322 is beneficial to the stable connection of the connecting seat 32 and the rod body 31, reduces or even avoids the relative shaking of the connecting seat 32 and the rod body 31, and the structure is beneficial to improving the connecting strength of the connecting seat 32 and the rod body 31, and avoiding damage of the connecting position of the connecting seat 32 and the rod body 31.

[0038] Preferably, the connecting seat 32 is provided with a mounting hole 323, the support cross rod 4 is arranged in the mounting hole 323, and one side of the mounting hole 323 is provided with a first fixing groove 324 for mounting a nut 113, and the first fixing groove 324 can limit the relative rotation of the nut 113; the bolt 112 penetrates the mounting hole 323 and the support cross rod 4 and is matched with the nut 113 in the first fixing groove 324, so that the connecting seat 32 is relatively fixed with the support cross rod 4, the arrangement of the mounting hole 323 is beneficial to increasing the contact area of the connecting seat 32 and the support cross rod 4, avoiding deformation or damage of the connecting seat 32 and the support cross rod 4 caused by stress concentration, and the arrangement of the first fixing groove 324 facilitates the positioning and installation of the nut 113, and facilitates the user to relatively fix the support cross rod 4 and the connecting seat 32 through the fastener.

[0039] The first hinged seat 18 and the second hinged seat 17 are detachably arranged on the side frame 1 through fasteners, the connecting seat 32 and the transmission connecting rod 5 are rotatably connected with the side frame 1 through the first hinged seat 18 and the second hinged seat 17, the first hinged seat 18 and the second hinged seat 17 are both provided with the second fixing groove 171 for mounting the nut 113, the second fixing groove 171 can limit the relative rotation of the nut 113, the bolt 112 penetrates the side frame 1 and is matched with the nut 113 in the fixing groove, so that the first hinged seat 18 or the second hinged seat 17 is relatively fixed with the side frame 1, the first hinged seat 18 and the second hinged seat 17 are beneficial to positioning installation through the detachable first hinged seat 18 and the second hinged seat 17 in the structure, welding position deviation or welding deformation of the rod body 31 in the production process is avoided, the position deviation of the first hinged seat 18 and the second hinged seat 17 on the side frame 1 is avoided, the assembly and production of the wheelchair are facilitated, the first hinged seat 18 and the second hinged seat 17 can be flexibly adjusted according to the needs of the producer, and the flexible production and assembly of the wheelchair are facilitated.

[0040] The two groups of first hinged seats 18 are arranged on the side frame 1, the rotating shaft 33 is arranged between the two groups of first hinged seats 18, the rotating shaft 33 is fixedly connected with the connecting seat 32, the rotating shaft 33 and the supporting cross rod 4 on the two rod bodies 31 are reversely assembled, at least two groups of fixing holes 111 for mounting the second hinged seat 17 are arranged on the side frame 1, the second hinged seat 17 connected with the transmission connecting rod 5 on the two rod bodies 31 is mounted on the side frame 1 through different groups of fixing holes 111, and the rotating shaft 33 and the two groups of first hinged seats 18 are arranged, so that the stress of the first hinged seat 18 is dispersed, the side frame 1 is prevented from being deformed due to stress, the rotating shaft 33 is reversely installed, and a plurality of fixing holes 111 are arranged, so that the two side frames 1 share part of components, the types of wheelchair parts are reduced, and the production cost is reduced.

[0041] The reverse assembly is that the two ends of the rotating shaft 33 or the supporting cross rod 4 are transposed, the connecting seat 32 is connected to one side of the middle of the rotating shaft 33 in the embodiment, when the rotating shaft 33 on the two rod bodies 31 is reversely assembled, the two rod bodies 31 are staggered, mutual interference in the relative rotation of the two rod bodies 31 is avoided, preferably, two bolt holes 41 are arranged on the supporting cross rod 4 at intervals, when the supporting cross rod 4 on the two rod bodies 31 is reversely assembled, the bolt 112 penetrates the two bolt holes 41 and is connected with the connecting seat 32, so that the end parts of the supporting cross rods 4 on the two rod bodies 31 can be avoided from being dislocated, and the installation of the seat cushion is facilitated.

[0042] The mounting structure of the first hinged seat 18 and the second hinged seat 17 on the side frame 1 is the same, the first hinged seat 18 and the second hinged seat 17 are provided with positioning grooves 172 matched with the side frame 1, the bolt 112 penetrates the side frame 1 and is matched with the nut 113 in the second fixing groove 171, preferably, the bolt head of the bolt 112 is provided with a gasket 114 matched with the side frame 1 between the bolt head of the bolt 112 and the side frame 1, so that the local stress of the side frame 1 is avoided from being too large to deform.

[0043] The two groups of side frames 1 are provided with footboards 6, the footboards 6 are respectively provided with rotating seats 61 and fixed clamping grooves 62, the rotating seat 61 is rotatably connected with one group of side frames 1, and the fixed clamping groove 62 is detachably connected with the other group of side frames 1, the fixed clamping groove 62 is connected with the side frame 1 to limit the relative approach of the two groups of side frames 1 and avoid the relative folding of the connecting rod device 3, and the footboard 6 is rotatably connected with and clamped with the two groups of side frames 1, so that the two groups of side frames 1 are prevented from approaching each other during use, and the stability of the unfolded wheelchair is facilitated.

[0044] The fixed clamping groove 62 can be clamped with the side frame 1 in the embodiment, the fixed clamping groove 62 can also be arranged below the footboard 6, and the fixed clamping groove 62 is matched with the side frame 1 through the gravity of the footboard 6 and the pressure of the user on the footboard 6; when the wheelchair needs to be folded, the fixed clamping groove 62 is controlled to be separated from the side frame 1, and the supporting cross rod 4 is controlled to be separated from the elastic clamping groove 161, so that the two groups of side frames 1 can approach each other.

[0045] The side frame 1 extends forwardly to form a mounting rod 11 in the utility model, an extension rod 15 is slidably arranged on the mounting rod 11, the upper end extension rods 15 of the two groups of side frames 1 are connected with the rotating seat 61 and the fixed clamping groove 62 respectively, the extension rod 15 has a plurality of fixing positions 151, the vertical distance between the footboard 6 and the supporting cross rod 4 is different when the mounting rod 11 is installed at different fixing positions 151, the mounting rod 11 and the extension rod 15 are arranged to facilitate the user to adjust the vertical distance between the footboard 6 and the supporting cross rod 4 according to the needs, and the comfort of the wheelchair is improved.

[0046] The supporting wheel 2 comprises a main wheel 21 arranged at the rear part of the side frame 1 and a universal wheel 22 arranged at the front part of the side frame 1 in the utility model, the side frame 1 extends forwardly to form a fixing rod 12, a mounting seat 14 is fixedly arranged on the fixing rod 12, the universal wheel 22 is rotatably arranged on the mounting seat 14, and an auxiliary connecting rod 13 is fixedly arranged between the mounting seat 14 and the mounting rod 11, the arrangement of the universal wheel 22 facilitates the flexible turning of the wheelchair, and the arrangement of the auxiliary connecting rod 13 is beneficial to improving the mounting strength of the mounting seat 14 and avoiding the deformation of the side frame 1 caused by the excessive load of the wheelchair.

[0047] Preferably, the supporting wheel 2 further comprises an auxiliary wheel group 23, the rear side of the side frame is provided with a plug-in hole 19, the auxiliary wheel group 23 is fixed in the plug-in hole 19 and extends rearwardly to the side frame 1.

[0048] The above embodiments are only preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A wheelchair comprising two sets of side frames (1), each of the two sets of side frames (1) being provided with a support wheel (2) on the upper portion thereof, a connecting rod device (3) being provided between the two sets of side frames (1), and the two sets of side frames (1) being brought closer together to drive the connecting rod device (3) to fold, characterized in that: The connecting rod device (3) comprises two rod bodies (31) hinged in an X shape, and connecting seats (32) are detachably provided at both ends of the rod bodies (31). The connecting seat (32) at one end of the rod body (31) is rotatably connected to the side frame (1), and a supporting cross bar (4) for supporting a seat cushion is detachably provided on the connecting seat (32) at the other end of the rod body (31). Fasteners connect the connecting seat (32), the rod body (31) and the supporting cross bar (4) to form an L-shaped or T-shaped structure, and a transmission connecting rod (5) is rotatably provided on the rod body (31). The side frame (1), the transmission connecting rod (5) and the two rod bodies (31) are rotatably connected in sequence to form a four-bar mechanism. The side frame (1) can support the supporting cross bar (4) and keep the connecting rod device (3) in an expanded state.

2. A wheelchair according to claim 1, characterized in that: A support seat (16) is detachably provided on the upper side of the side frame (1), and the side frame (1) supports the support cross bar (4) via the support seat (16). An elastic clamping groove (161) is provided on the support seat (16), and the support cross bar (4) cooperates with the elastic clamping groove (161) to relatively fix the support cross bar (4) and the side frame (1).

3. The wheelchair according to claim 1, characterized in that: The rod body (31) is tubular, and the connecting seat (32) is provided with an inserting portion (321) inserted into the rod body (31) and a pressing portion (322) for pressing against the side wall of the rod body (31). The fastener penetrates the rod body (31) and is connected to the inserting portion (321), thereby fixing the connecting seat (32) and the rod body (31) relative to each other.

4. The wheelchair according to claim 1, characterized in that: The connecting seat (32) is provided with a mounting hole (323), the supporting cross bar (4) is passed through the mounting hole (323), and a first fixing groove (324) for installing a nut (113) is provided on one side of the mounting hole (323), and the first fixing groove (324) can limit the relative rotation of the nut (113); the bolt (112) passes through the mounting hole (323) and the supporting cross bar (4) and cooperates with the nut (113) in the first fixing groove (324), so that the connecting seat (32) and the supporting cross bar (4) are relatively fixed.

5. The wheelchair according to claim 1, characterized in that: The side frame (1) is detachably provided with a first hinge seat (18) and a second hinge seat (17) via fasteners. The connecting seat (32) and the transmission connecting rod (5) are rotatably connected to the side frame (1) via the first hinge seat (18) and the second hinge seat (17). The first hinge seat (18) and the second hinge seat (17) are both provided with a second fixing groove (171) for installing a nut (113). The second fixing groove (171) can limit the relative rotation of the nut (113). The bolt (112) passes through the side frame (1) and cooperates with the nut (113) in the fixing groove, thereby fixing the first hinge seat (18) or the second hinge seat (17) relative to the side frame (1).

6. The wheelchair according to claim 5, characterized in that: The side frame (1) is provided with two groups of first hinged seats (18), a rotating shaft (33) is provided between the two groups of first hinged seats (18), the rotating shaft (33) is fixedly connected to the connecting seat (32), the rotating shaft (33) and the supporting cross bar (4) on the two rod bodies (31) are assembled in reverse, and at least two groups of fixing holes (111) for installing the second hinged seats (17) are provided on the side frame (1), and the second hinged seats (17) connected to the transmission connecting rods (5) on the two rod bodies (31) are respectively installed on the side frame (1) through different groups of fixing holes (111).

7. The wheelchair according to claim 1, characterized in that: A footrest (6) is provided between the two groups of side frames (1), and a rotating seat (61) and a fixed slot (62) are respectively provided on the footrest (6); the rotating seat (61) is rotatably connected to one group of side frames (1), and the fixed slot (62) is detachably connected to the other group of side frames (1); the fixed slot (62) is connected to the side frames (1) to limit the relative approach of the two groups of side frames (1) and prevent the connecting rod device (3) from being relatively folded.

8. The wheelchair according to claim 7, characterized in that: The side frame (1) extends forward to form a mounting rod (11), and an extension rod (15) is slidably provided on the mounting rod (11). The extension rods (15) at the upper ends of the two groups of side frames (1) are respectively connected to the rotating seat (61) and the fixed slot (62). The extension rod (15) has a plurality of fixed positions (151). When the mounting rod (11) is installed at different fixed positions (151), the vertical distance between the footrest (6) and the supporting crossbar (4) is different.

9. The wheelchair according to claim 8, characterized in that: The support wheel (2) comprises a main wheel (21) arranged at the rear of the side frame (1) and a universal wheel (22) arranged at the front of the side frame (1); the side frame (1) extends forward to form a fixed rod (12); a mounting seat (14) is fixedly arranged on the fixed rod (12); the universal wheel (22) is rotatably arranged on the mounting seat (14); and an auxiliary connecting rod (13) is fixedly arranged between the mounting seat (14) and the mounting rod (11).

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