Foldable wheelchair frame and wheelchair

Abstract

The utility model discloses a foldable wheelchair frame and a wheelchair. The foldable wheelchair frame comprises two main beam sets arranged on the two sides and two auxiliary supporting sets arranged in the middle, each auxiliary supporting set is connected with the main beam sets on the two sides, the two auxiliary supporting sets are connected with each other, and each auxiliary supporting set comprises a first support, a second support, a third support and a connecting plate assembly. The first support is fixed to one main beam set, one ends of the second supports and the third supports are arranged on the first support, the other ends of the second supports and the third supports are arranged on the main beam set on the opposite side, the second supports are parallel to the third supports, the two second supports are connected in a crossed mode, and the two third supports are connected in a crossed mode. One end of the connecting plate assembly is arranged on the second support or the third support, and the other end of the connecting plate assembly is arranged on the main beam set for fixing the first support. When the bicycle frame is folded, the splayed bending phenomenon can be effectively prevented through the connecting plate assembly, and therefore the stability of the whole structure is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wheelchair technical field especially relates to a foldable wheelchair frame and wheelchair. BACKGROUND

[0002] The wheelchair frame is a kind of activity support equipment specially designed for patient with inconvenient legs, it has been widely used in hospital, and great convenience is provided for those patients with inconvenient action. With the continuous progress of science and technology and the increasing improvement of manufacturing technology, the types of wheelchair frame also become more and more rich and varied. There are not only manual operation wheelchair on the market, but also wheelchair equipped with advanced automatic driving system, these automatic wheelchairs can be controlled by electronic equipment, greatly improve the self-activity ability of patients. With the improvement of people's quality of life requirements, the structure requirements of wheelchair frame are also continuously improved to ensure the safety, comfort and durability of wheelchair, meet the needs of different patients.

[0003] The existing wheelchair frame has certain drawbacks when in use. First, the frame is prone to deformation. This is because during long-term use, the metal material of the frame may be deformed due to the action of various external forces, thereby affecting the overall performance of the bicycle and the comfort of riding. The frame usually adopts a round tube structure, but excessive hole design will significantly reduce its structural strength, thereby increasing the fragility of the frame. This is because the round tube structure and the hole design weaken the structural integrity of the frame, making the frame more prone to deformation or even breakage when subjected to pressure, thereby increasing the vulnerability of the frame. SUMMARY

[0004] The main purpose of the utility model is to provide a foldable wheelchair frame and wheelchair, so as to overcome the shortcomings in the prior art. In order to achieve the foregoing utility model purpose, the utility model adopts the technical scheme including:

[0005] The first aspect of the utility model provides a foldable wheelchair frame, which comprises two main beam groups arranged on both sides, two auxiliary support groups arranged in the middle, each auxiliary support group is connected with the main beam group on both sides, and the two auxiliary support groups are connected with each other, wherein each auxiliary support group comprises a first support, a second support, a third support and a connecting plate assembly, the first support is fixed on a main beam group, one end of the second support and the third support is arranged on the first support, and the other end is arranged on the main beam group on the opposite side, and the second support and the third support are parallel, the two second supports are cross-connected, and the two third supports are cross-connected, one end of the connecting plate assembly is arranged on the second support and / or the third support, and the other end is arranged on the main beam group fixing the first support.

[0006] In a more specific embodiment, the main beam group comprises a one-piece frame, a backrest, the one-piece frame comprising a first rod, a second rod, a third rod, one end of the first rod and one end of the third rod being fixed on the backrest, one end of the second rod being connected with the first rod and the other end being connected with the third rod, the first rod being provided with an armrest, the second rod being provided with a foot-hanging fixing seat, and the third rod being provided with a front wheel fixing seat, one end of the backrest being provided with a handle and the other end being provided with a rear wheel fixing seat.

[0007] In a more specific embodiment, the connecting plate assembly comprises a first connecting plate and a second connecting plate, one end of the first connecting plate being fixed on the one-piece frame and the other end being fixed on the second support, one end of the second connecting plate being fixed on the backrest and the other end being fixed on the third support.

[0008] In a more specific embodiment, the one-piece frame is a flat tube, the cross section of the flat tube comprising a first plane, a first arc surface, a second plane and a second arc surface connected in sequence, the first plane and the second plane being in opposite positions, and the first arc surface and the second arc surface being in opposite positions.

[0009] Preferably, the first rod and the third rod are parallel, and the second rod and the third rod are cross-connected.

[0010] In a more specific embodiment, the main beam group further comprises a vertical support, one end of the vertical support being fixed on the first rod and the other end being fixed on the third rod, one end of the first connecting plate being fixed on the vertical support and the other end being fixed on the second support.

[0011] Preferably, the vertical support is in the same plane as the two second supports.

[0012] In a more specific embodiment, the foldable wheelchair frame further comprises a first connecting assembly, the foot-hanging fixing seat being provided with a first assembly groove and a second assembly groove, the first assembly groove being used for partially embedding the second rod, the first connecting assembly being used for fixedly connecting the foot-hanging fixing seat and the second rod, and the second assembly groove being used for arranging a footrest support rod.

[0013] In a more specific embodiment, the rear wheel fixing seat comprises a first fixing part and a second fixing part in the vertical direction, the first fixing part being provided with a first through hole, and the second fixing part being provided with a second through hole, the first through hole or the second through hole being used for mounting a rear wheel.

[0014] In a more specific embodiment, the foldable wheelchair frame further comprises an anti-tilt device, the anti-tilt device being arranged on the rear wheel fixing seat, and preferably, the anti-tilt device is an anti-tilt rod, the anti-tilt rod being perpendicular to the backrest.

[0015] In a more specific embodiment, the first rod body is provided with a battery mounting seat.

[0016] In a more specific embodiment, the hanging foot fixing seat comprises a base and first, second, third and fourth assembling plates, the base has a first face and a second face arranged oppositely, the first and second assembling plates are fixedly arranged on the first face of the base and enclose the first assembling groove with the first face, the third and fourth assembling plates are fixedly arranged on the second face of the base and enclose the second assembling groove with the second face,

[0017] The third and fourth assembling plates are each provided with at least one third assembling hole and at least one fourth assembling hole, the third and fourth assembling holes are located at different height levels in the longitudinal direction of the second assembling groove, all the third assembling holes are located at the same height level, all the fourth assembling holes are located at the same height level, the third assembling holes on the third and fourth assembling plates are arranged as at least one third assembling hole group, two third assembling holes in each third assembling hole group are coaxially arranged, the fourth assembling holes on the third and fourth assembling plates are arranged as at least one fourth assembling hole group, two fourth assembling holes in each fourth assembling hole group are coaxially arranged.

[0018] Preferably, the bottom of the second assembling groove is further provided with an avoiding groove, the width of the avoiding groove is smaller than the width of the second assembling groove, and the width of the first end of the foot pedal supporting rod is smaller than the width of the second assembling groove.

[0019] Preferably, the first end face of the foot pedal supporting rod is a rounded structure, and the avoiding groove is an arc-shaped groove or a semi-cylindrical groove.

[0020] Preferably, the length extension directions of the first and second assembling grooves are parallel.

[0021] Preferably, the first, second, third and fourth assembling plates are arranged in parallel.

[0022] The second aspect of the utility model provides a wheelchair, including wheel group, seat and foldable wheelchair frame, wheel group, seat set in the frame.

[0023] In a more specific embodiment, the wheelchair further comprises a driving motor and a brake device, and the driving motor and the brake device are arranged on the frame.

[0024] Compared with the prior art, the utility model has at least the following advantages:

[0025] First, the folding wheelchair frame provided by the utility model adopts an integral flat pipe structure, which can provide sufficient strength and stability, and will not cause the pipe body to break or be unstable when holes are opened in the pipe body to fix other structures, thereby avoiding the problems of easy deformation and breakage.

[0026] Second, the folding wheelchair frame provided by the utility model is characterized in that one end of the vertical support frame is connected with the first rod body, and the other end is connected with the third rod body, thereby forming a firm support network. In addition, one end of the first connecting plate is fixed on the vertical support frame, and the other end is tightly connected with the second support. One end of the second connecting plate is connected with the backrest frame, and the other end is fixedly connected with the third support, so that the main beam group and the auxiliary support group can efficiently cooperate to jointly bear the weight and pressure, and the frame can be very smoothly folded when the frame is folded, so that the eight-shaped bending phenomenon during use of the wheelchair frame can be effectively prevented, thereby significantly improving the stability of the whole structure.

[0027] Third, the folding wheelchair frame provided by the utility model is characterized in that the rear wheel fixing seat comprises a first fixing part and a second fixing part in the vertical direction, the first fixing part comprises a first through hole for installing the rear wheel of the electric wheelchair, and the second fixing part comprises a second through hole for installing the rear wheel of the manual wheelchair, so that different types of wheelchairs can be flexibly adapted, and good support and fixation can be obtained for both electric wheelchairs and manual wheelchairs, thereby greatly improving the universality of the wheelchair and the convenience of the user.

[0028] Fourth, the folding wheelchair frame provided by the utility model further comprises an anti-roll bar arranged on the rear wheel fixing seat and perpendicular to the backrest frame, so that unnecessary inclination of the vehicle during driving is prevented, and the overall structure is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structure schematic view of a folding wheelchair frame provided by an embodiment of the utility model;

[0030] Figure 2 is a structure schematic view of a manual wheelchair provided by an embodiment of the utility model;

[0031] Figure 3 is a structure schematic view of an electric wheelchair provided by an embodiment of the utility model;

[0032] Figure 4 is a structure schematic view of a foot-up hanging foot seat of a folding wheelchair provided by an embodiment of the utility model;

[0033] Figure 5 is a structure schematic view of a side frame of a folding wheelchair provided by an embodiment of the utility model;

[0034] Figure 6 It is the structural schematic view of the foldable wheelchair side frame provided by the embodiment of the utility model.

[0035] Mark explanation:

[0036] 11, first rod body; 12, second rod body; 13, third rod body; 14, vertical support frame; 2, backrest frame; 3, armrest frame; 41, first support; 42, second support; 43, third support; 51, first connecting plate; 52, second connecting plate; 6, rear wheel fixing seat; 61, first through hole; 62, second through hole; 63, anti-tilt rod; 7, motor fixing plate; 210, foot fixing seat; 211, first assembly groove; 212, second assembly groove; 220, footstep support rod; 240, first connecting assembly; 250, second connecting assembly; 280, adjusting piece; 281, guide hole; 290, limiting column. Specific implementation

[0037] In view of the deficiencies in the prior art, the present application has been proposed after long-term research and a large number of practices. The technical solution, its implementation process and principles will be further explained as follows.

[0038] Please refer to Figure 1 A frame includes two main beam groups arranged on both sides and two auxiliary support groups arranged in the middle. The two auxiliary support groups are connected with the main beam groups on both sides respectively, and the two auxiliary support groups are also connected with each other, forming a stable support structure. The main beam group includes an integrated frame and a backrest frame 2. The integrated frame is composed of a first rod body 11, a second rod body 12 and a third rod body 13. One end of the first rod body 11 and one end of the third rod body 13 are fixed on the backrest frame 2, and one end of the second rod body 12 is connected with the first rod body 11 and the other end is connected with the third rod body 13, forming a firm frame structure. In order to improve the comfort and safety during use, the first rod body 11 is provided with an armrest frame 3, the second rod body 12 is provided with a foot fixing seat, and the third rod body 13 is provided with a front wheel fixing seat. In addition, one end of the backrest frame 2 is provided with a handle for facilitating the user to push the frame, and the other end is provided with a rear wheel fixing seat 6 for installing the rear wheel, ensuring the stability and mobility of the frame.

[0039] In this embodiment, the cross section of the integrated frame is a flat tube, i.e. the first rod body 11, the second rod body 12 and the third rod body 13 are flat tubes. The second rod body 12 is inclined between the first rod body 11 and the third rod body 13, so that the second rod body 12 is convenient to install the foot.

[0040] Specifically, the cross-section design of the integrated frame is a flat tubular structure, that is, the first rod body 11, the second rod body 12, and the third rod body 13 all adopt flat tubes. The use of an integrated flat tube structure not only provides sufficient strength and stability, but also does not cause the tube to break or be unstable when holes are opened on it to fix other structures, thereby avoiding the problems of easy deformation and breakage. In addition, since such an integrated frame simplifies the assembly, disassembly, and folding process, the use and maintenance of the entire frame become more convenient and fast. In addition, the second rod body 12 presents a certain inclination angle relative to the first rod body 11 and the third rod body 13. Such a design makes it more convenient and fast to install the hanging feet when the second rod body 12 is installed. The connection mode of the inclined second rod body 12 with the first rod body 11 and the third rod body 13 not only improves the convenience of installation, but also can bring a more comfortable and ergonomic use experience to the user.

[0041] Further, in the present embodiment, the auxiliary support group is composed of three main supports, namely the first support 41, the second support 42, and the third support 43. The first support 41 is fixed on the first rod body 11 and maintains a parallel relationship with the first rod body 11. For the second support 42 and the third support 43, one end is arranged on the first rod body 11, and the other end is arranged on the third rod body 13 of the opposite main beam group. In addition, the second support 42 and the third support 43 also maintain a parallel layout. It is particularly worth noting that the two second supports 42 are fixed together in a cross manner, and similarly, the two third supports 43 are also fixed together in a cross manner, which can enhance the stability and support force of the entire structure.

[0042] In the present embodiment, the first rod body 11 is provided with a battery mounting seat, and the first rod body 11 is provided with a brake device. The main beam group is further provided with a vertical support frame 14. One end of the vertical support frame 14 is connected with the first rod body 11, and the other end is connected with the third rod body 13, forming a firm support network. In addition, the auxiliary support group further includes a first connecting plate 51 and a second connecting plate 52. Specifically, one end of the first connecting plate 51 is fixed on the vertical support frame 14, and the other end is closely connected with the second support 42. One end of the second connecting plate 52 is connected with the backrest frame 2, and the other end is fixedly connected with the third support 43. Through such a structure, it can ensure that the main beam group and the auxiliary support group can work efficiently and cooperatively to jointly bear the weight and pressure, thereby further enhancing the overall performance and safety of the wheelchair. Such a design not only improves the carrying capacity of the wheelchair, but also ensures that the wheelchair can maintain good stability and reliability in various use environments.

[0043] In this embodiment, the vertical support frame 14 is located on the plane formed by the intersection of two second supports 42. When the frame is folded, it can be folded very smoothly, and the phenomenon of "splay" when using the wheelchair frame can be effectively prevented, thereby significantly improving the stability of the entire structure.

[0044] In this embodiment, the rear wheel fixing seat 6 includes a first fixing part and a second fixing part in the vertical direction. Specifically, the first fixing part includes a first through hole 61 for installing the rear wheels of the electric wheelchair, ensuring the stability and safety of the electric wheelchair during use. At the same time, the second fixing part includes a second through hole 62 for installing the rear wheels of the manual wheelchair. The rear wheel fixing seat 6 can flexibly adapt to different types of wheelchairs, whether electric or manual, and can be well supported and fixed, thereby greatly improving the versatility of the wheelchair and the convenience of the user.

[0045] In this embodiment, the frame also includes an anti-roll bar 63, which is arranged on the rear wheel fixing seat 6 and perpendicular to the backrest frame 2. Specifically, the anti-roll bar 63 prevents unnecessary tilting of the vehicle during driving. The anti-roll bar 63 maintains a perpendicular relationship with the backrest frame 2, which helps to provide additional support when the wheelchair turns or encounters uneven road surfaces, thereby ensuring the handling performance of the vehicle and the comfort of the occupant. Through the anti-roll bar 63, the overall structure of the frame is more stable.

[0046] Please refer to Figure 2 , Figure 4 , Figure 5 , the application also provides an electric active wheelchair, including the frame in the above embodiments, and a front wheel group, a rear wheel group, a seat, a driving motor and other components. Specifically, the front wheel group is installed on the front wheel fixing seat. The rear wheel group is installed on the second fixing part of the rear wheel fixing seat 6 through the second through hole 62. The seat is installed on the first support 41 of the auxiliary support group, which not only provides a comfortable sitting position, but also ensures the stability of the user during use. The foot fixing seat is arranged on the second rod body 12, which can conveniently fix the feet of the user when needed to maintain comfort and safety. In addition, a motor fixing plate 7 is additionally provided on the first rod body 11 and the third rod body 13, which provides a stable mounting position for the driving motor and ensures the safe and stable operation of the motor.

[0047] In a more typical embodiment, the foot hanging fixing base 210 is fixedly assembled on the second rod body 12 through the first connecting assembly 240, and the foot supporting rod 220 is assembled on the foot hanging fixing base 210 through the second connecting assembly 250. The foot supporting rod 220 and the foot hanging fixing base 210 can be fixedly connected or rotatably connected. When the foot supporting rod 220 and the foot hanging fixing base 210 are rotatably connected, the foot supporting rod 220 can rotate around the first axis.

[0048] Specifically, referring to Figures 4-5 , the foot hanging fixing base 210 includes a base and first, second, third and fourth assembling plates. The base has a first face and a second face arranged oppositely. The first and second assembling plates are fixedly arranged on the first face of the base and enclose the first face to form a first assembling groove 211. The third and fourth assembling plates are fixedly arranged on the second face of the base and enclose the second face to form a second assembling groove 212. The second rod body 12 is arranged in the first assembling groove 211 between the first and second assembling plates and is fixed through the first connecting assembly 240. Part of the foot supporting rod 220 is arranged in the second assembling groove 212 between the third and fourth assembling plates and is connected to the foot hanging fixing base 210 through the second connecting assembly 250.

[0049] More specifically, the first, second, third and fourth assembling plates are arranged in parallel. The first, second, third and fourth assembling plates and the base can be fixedly combined into one body by a known fixing method such as welding. Of course, the first, second, third and fourth assembling plates and the base can be integral. For example, the foot hanging fixing base 210 can be made of a hard material such as metal.

[0050] More specifically, the first connecting assembly 240 includes at least two bolt connecting pairs. Each bolt connecting pair includes a bolt and a nut. The shank of the bolt passes through the first assembling plate, the second rod body 12, the second assembling plate and is connected to the nut. More specifically, two or more bolt connecting pairs are arranged in the length direction of the first assembling plate. In order to improve the stability of the connection structure between the foot hanging fixing base 210 and the second rod body 12 without complicating the structure, the part of the second rod body 12 in the first assembling groove 211 and in contact with the fixing base 210 is a flat columnar structure. That is, the side surface of the second rod body in contact with the first and second assembling plates is a plane, and the rest of the surface of the part in the first assembling groove 211 is a circular arc surface. Through such a design, the first and second assembling plates of the fixing base 210 have a larger contact area with the second rod body 12, which can improve the stability and reliability of the fixing structure of the two without increasing the number of bolt connecting pairs.

[0051] More specifically, the second connecting assembly 250 is a set of bolted pairs, the shanks of the bolts in the second connecting assembly 250 pass through the third assembly plate, the first end of the pedal support rod 220, the fourth assembly plate in sequence and are bolted, thereby realizing the connection of the pedal support rod 220 and the foot hanging fixing seat 210, and the first axis is parallel to the axis of the shank of the bolt in the second connecting assembly 250.

[0052] The foot hanging fixing seat 210, the pedal support rod 220 and the second connecting assembly 250 are specifically configured as follows and realize the fixed or rotating connection of the pedal support rod 220 and the foot hanging fixing seat 210.

[0053] Specifically, the third assembly plate and the fourth assembly plate are provided with two or more assembly hole groups, each assembly hole group includes two assembly holes (i.e., the third assembly hole and the fourth assembly hole) disposed on the same axis and at the same height plane on the third assembly plate and the fourth assembly plate, respectively, and the structures and sizes of all the assembly holes are the same, wherein the height plane is taken as the reference of the longitudinal direction of the second assembly groove 212. Taking two assembly hole groups as an example, the two assembly hole groups are defined as the third assembly hole group and the fourth assembly hole group, the third assembly hole group and the fourth assembly hole group are located at different height planes, and the pedal support rod 220 can be connected with the foot hanging fixing seat 210 through the second connecting assembly 250, the third assembly hole group or the fourth assembly hole group.

[0054] When the shank of the bolt in the second connecting assembly 250 passes through the through hole on the first end of the pedal support rod 220 to connect the pedal support rod 220 and the foot hanging fixing seat 210, the first end of the pedal support rod 220 and the groove bottom of the second assembly groove 212 have a first height difference, the first height difference is smaller than the vertical distance between the through hole and the first end surface, the pedal support rod 220 and the foot hanging fixing seat 210 are connected through the second connecting assembly 250 and are limited to keep the fixed posture; when the shank of the bolt in the second connecting assembly 250 passes through the through hole on the first end of the pedal support rod 220 to connect the pedal support rod 220 and the foot hanging fixing seat 210, the first end of the pedal support rod 220 and the groove bottom of the second assembly groove 212 have a second height difference, the second height difference is greater than or equal to the vertical distance between the through hole and the first end surface, the pedal support rod 220 and the foot hanging fixing seat 210 are connected through the second connecting assembly 250 and the pedal support rod 220 can rotate around the second connecting assembly 250.

[0055] It can be understood that when the screw rod of the second connecting assembly 250 passes through the third assembly hole group and the through hole on the first end of the foot support rod 220 to connect the foot support rod 220 with the foot fixing seat 210, although the foot support rod 220 is movable relative to the second connecting assembly 250, the rotation of the foot support rod 220 is limited and blocked by the foot fixing seat 210, so that the rotation of the foot support rod 220 is limited and maintains a relatively fixed posture with the foot fixing seat 210, and when the screw rod of the second connecting assembly 250 passes through the fourth assembly hole group and the through hole on the first end of the foot support rod 220 to connect the foot support rod 220 with the foot fixing seat 210, the foot support rod 220 is not limited in the direction away from the foot fixing seat 210, so it can rotate within a certain angle, that is, the foot support rod 220 can be lifted upward relative to the second rod body 12. Through such design, without changing the structure of the foot support rod 220, only changing the assembly position of the foot support rod 220 on the foot fixing seat 210 can make the foot support rod 220 present a fixed posture or a rotatable adjustable adjusting posture.

[0056] Specifically, in order to further improve the adjustment smoothness of the foot support rod 220 in the rotatable adjusting state, the bottom of the second assembly groove 212 is further provided with an avoiding groove, the width of the avoiding groove is smaller than the width of the second assembly groove 212, the width of the first end of the foot support rod 220 is smaller than the width of the second assembly groove 212, the width of the first end of the foot support rod 220 is greater than the width of the avoiding groove and smaller than the width of the second assembly groove 212, the first end surface of the foot support rod 220 is a rounded structure, and the avoiding groove is an arc-shaped groove or a semi-cylindrical groove. It should be noted that the width of the avoiding groove is smaller than the width of the first end of the foot support rod 220, and when the screw rod of the second connecting assembly 250 passes through the third assembly hole group and the through hole on the first end of the foot support rod 220 to connect the foot support rod 220 with the foot fixing seat 210, the foot support rod 220 cannot rotate out of the limitation of the foot fixing seat 210.

[0057] Please refer to Figure 3 、 Figure 4 、 Figure 6 , the application also provides a manual orthopedic wheelchair, which comprises the frame in the above-mentioned embodiments, and a front wheel group, a rear wheel group, a seat and the like. Specifically, the front wheel group is installed on the front wheel fixing seat. The rear wheel group is installed on the first fixing part of the rear wheel fixing seat 6 through the first through hole 61. The seat is installed on the first support 41 of the auxiliary support group. Such structure not only can provide a comfortable sitting posture, but also can ensure the stability of the user during use. The foot fixing seat is arranged on the second rod body 12, which can fix the feet of the user when needed to maintain comfort and safety.

[0058] While keeping the angle adjustable between the footrest support rod 220 and the fixed seat 210, the angle between the footrest support rod 220 and the fixed seat 210 is fixed, and the angle adjusting assembly is further included, the angle adjusting assembly includes an adjusting piece 280 and a limiting column 290, the adjusting piece 280 is rotationally connected with the footrest support rod 220, the adjusting piece 280 is provided with a guide hole 281, the guide hole 281 is an arc-shaped hole extending along the rotation direction of the footrest support rod 220 around the first axis (the adjusting piece 280 is an arc-shaped member as a whole, and the arc length direction of the adjusting piece 280 is the rotation direction of the footrest support rod 220 around the first axis), the first side wall of the guide hole 281 is provided with a plurality of limiting protrusions, the plurality of limiting protrusions are arranged at intervals along the arc length direction of the guide hole 281, the adjacent two limiting protrusions and the limiting protrusion at the outermost position and the hole wall of the guide hole 281 form a clamping groove, the gap between the limiting protrusion and the second side wall of the guide hole 281 can pass the limiting column, and the first side wall and the second side wall are oppositely arranged along the width direction of the guide hole 281; the limiting column 290 is fixed on the fixed seat 210, part of the limiting column 290 is arranged in the guide hole 281, and the limiting column 290 can move relative to the adjusting piece 280 along the arc length direction of the guide hole 281, and under the action of the gravity of the adjusting piece 280, the limiting column 290 is arranged in the clamping groove correspondingly, and the limiting column 290 is kept relatively fixed with the adjusting piece 280, so that the footrest support rod 220 and the fixed seat 210 keep a fixed angle, and by making the adjusting piece 280 and the limiting column move relative to each other along the arc length direction of the guide hole 281, the limiting column 290 can be clamped in different clamping grooves, so that the footrest support rod 220 and the fixed seat 210 present different angles. Specifically, the limiting column 290 is fixed on the third assembly plate or the fourth assembly plate, and the limiting column 290 can be a bolt, and the limiting column 290 can be threadedly connected with the third assembly plate or the fourth assembly plate.

[0059] It should be understood that the above embodiments are only to illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A foldable wheelchair frame, characterized in that, The main beam group comprises an integrated frame and a backrest frame, the integrated frame comprises a first rod body, a second rod body and a third rod body, one end of the first rod body and one end of the third rod body are fixed on the backrest frame, one end of the second rod body is connected with the first rod body and the other end is connected with the third rod body, a handrail frame is arranged on the first rod body, a foot fixing seat is arranged on the second rod body, and a front wheel fixing seat is arranged on the third rod body, one end of the backrest frame is provided with a handle and the other end is provided with a rear wheel fixing seat.

2. The foldable wheelchair frame of claim 1, wherein, The connection plate assembly comprises a first connection plate and a second connection plate, one end of the first connection plate is fixed to the integrated frame and the other end is fixed to the second support, one end of the second connection plate is fixed to the backrest frame and the other end is fixed to the third support.

3. The foldable wheelchair frame of claim 2, wherein, The integrated frame is a flat pipe, the cross section of the flat pipe comprises a first plane, a first arc surface, a second plane and a second arc surface connected in sequence, the first plane and the second plane are in opposite positions, and the first arc surface and the second arc surface are in opposite positions.

4. The foldable wheelchair frame of claim 2, wherein, The first rod body and the third rod body are parallel, and the second rod body and the third rod body are cross arranged. The main beam group further comprises a vertical support frame, one end of the vertical support frame is fixed to the first rod body and the other end is fixed to the third rod body, one end of the first connection plate is fixed to the vertical support frame and the other end is fixed to the second support, 5. The foldable wheelchair frame of claim 3, wherein, The vertical support frame is in the same plane with the two second supports. The foot fixing seat has a first assembly groove and a second assembly groove arranged oppositely, the first assembly groove is used for embedding a part of the second rod body, the first connection assembly is used for fixedly connecting the foot fixing seat and the second rod body, and the second assembly groove is used for arranging a foot support rod.

6. The foldable wheelchair frame of claim 2, wherein, The foot fixing seat comprises a base and a first assembly plate, a second assembly plate, a third assembly plate and a fourth assembly plate, the base has a first surface and a second surface arranged oppositely, the first assembly plate and the second assembly plate are fixedly arranged on the first surface of the base and form a first assembly groove together with the first surface, the third assembly plate and the fourth assembly plate are fixedly arranged on the second surface of the base and form a second assembly groove together with the second surface, 7. The foldable wheelchair frame of claim 6, wherein, ​ The third assembly plate and the fourth assembly plate are provided with at least one third assembly hole and at least one fourth assembly hole, the third assembly hole and the fourth assembly hole are located at different height planes in the longitudinal direction of the second assembly groove, all the third assembly holes are located at the same height plane, all the fourth assembly holes are located at the same height plane, the third assembly holes on the third assembly plate and the fourth assembly plate are arranged as at least one third assembly hole group, two third assembly holes included in each third assembly hole group are coaxially arranged, the fourth assembly holes on the third assembly plate and the fourth assembly plate are arranged as at least one fourth assembly hole group, two fourth assembly holes included in each fourth assembly hole group are coaxially arranged; And / or, the groove bottom of the second assembly groove is further provided with a avoiding groove, the width of the avoiding groove is less than the width of the second assembly groove, the width of the first end of the pedal support rod is less than the width of the second assembly groove; And / or, the first end face of the pedal support rod is a rounded structure, the avoiding groove is an arc-shaped groove or a semi-cylindrical groove; And / or, the length extension directions of the first assembly groove and the second assembly groove are parallel; And / or, the first assembly plate, the second assembly plate, the third assembly plate and the fourth assembly plate are arranged in parallel; And / or, the rear wheel fixing seat includes a first fixing part and a second fixing part in the vertical direction, the first fixing part is provided with a first through hole, and the second fixing part is provided with a second through hole, the first through hole or the second through hole is used for mounting a rear wheel.

8. The foldable wheelchair frame of claim 2, wherein, Further comprising an anti-tilt device, the anti-tilt device is arranged on the rear wheel fixing seat, and / or the anti-tilt device is an anti-tilt rod, the anti-tilt rod is perpendicular to the backrest frame; And / or, the first rod body is provided with a battery mounting seat.

9. A wheelchair characterized by Further comprising a wheel set, a seat and the foldable wheelchair frame according to any one of claims 1-8, the wheel set and the seat are arranged on the frame.

10. The wheelchair of claim 9, wherein, Further comprising a driving motor and a brake device, the driving motor and the brake device are arranged on the frame.

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