Wheelchair folding frame and electric wheelchair

Abstract

The application discloses a wheelchair folding frame and an electric wheelchair, and belongs to the technical field of wheelchair walking and rehabilitation equipment; the folding frame comprises a front wheel frame, a rear wheel frame, a cushion frame, a backrest frame and a linkage mechanism; the upper end of the front wheel frame is fixed with the front end of the cushion frame, the upper end of the rear wheel frame is pivotally connected with the two sides of the cushion frame, the lower end of the backrest frame is pivotally connected with the rear end of the cushion frame, and the rear end of the cushion frame is internally provided with a locking portion. The linkage mechanism comprises a linkage frame and a control frame, the two ends of the linkage frame are respectively pivotally connected with the middle part of the backrest frame and the middle part of the rear wheel frame; the control frame is rotationally installed on the side surface of the rear wheel frame, the upper end of the control frame is provided with a locking hook portion capable of being clamped into the locking portion, and the control frame is connected with a control pull wire; the application can realize synchronous unlocking and linkage folding through single-time pressing control of a control pedal, is convenient to operate and is suitable for people with inconvenient movements; after unfolding, multiple limiting locking is achieved, the structure is stable and does not horizontally shake; after folding, the volume is compact, and the folding frame is convenient to store and transport on a vehicle.

Description

Technical Field

[0001] This invention relates to the field of wheelchair technology, specifically to a folding wheelchair frame and an electric wheelchair. Background Technology

[0002] Wheelchairs are important mobility and rehabilitation devices for people with mobility impairments. Foldable wheelchairs have become mainstream in the market for ease of storage, transportation, and vehicle transport. However, existing folding wheelchairs still have significant shortcomings in terms of ease of folding / unfolding operation, locking stability, and folded size, mainly in the following aspects:

[0003] (1) Traditional X-type cross-folding bicycle frames require both hands to lift the seat and pull multiple latches such as backrest, armrest, and foot pedal when unfolding and folding. The operation usually involves more than 4 steps, which is difficult for a single person to complete with one hand. It is especially difficult for elderly users and those with weak muscles to operate.

[0004] (2) Although some first-line folding products have introduced folding cables, their locking relies on the movable pins and springs in the seat cushion slide, and the backrest still needs to be driven separately. Moreover, the gap in the slide causes a large lateral sway after unfolding, resulting in poor riding comfort and safety.

[0005] (3) The linkage folding scheme of folding arm and switch lock is adopted. The seat cushion relies on the scissor bracket to lift and lower on the chassis. The chassis needs to participate in the folding as well, resulting in a large overall thickness after folding. Moreover, the multi-point locking makes the structure complex and the failure rate high.

[0006] Therefore, there is an urgent need for a wheelchair frame and wheelchair that can simultaneously fold the frame and backrest in a single operation, lock stably and reliably, and have a compact size after folding. Summary of the Invention

[0007] In view of the shortcomings of existing folding wheelchairs, such as multiple operation steps, unstable locking, and large folding volume, this invention provides a folding wheelchair frame that coordinates the release of the control frame lock hook and the synchronous folding of the linkage frame through a single control cable, achieving rapid linkage folding with one pull and two actions, and automatically locking after unfolding, ensuring structural stability.

[0008] The technical solution adopted in this invention is as follows: a folding wheelchair frame, including a front wheel frame, a rear wheel frame, a seat cushion frame, and a linkage mechanism; the front wheel frame and the rear wheel frame are located below the seat cushion frame, with the upper sides of the front wheel frame fixed to the sides of the seat cushion frame, and the upper sides of the rear wheel frame pivotally connected to the sides of the seat cushion frame; a backrest frame is provided at the rear end of the seat cushion frame, with the lower sides of the backrest frame pivotally connected to the seat cushion frame, and locking parts are also provided on the two inner sides of the rear end of the seat cushion frame; the linkage mechanism includes a linkage frame and a control frame, with the upper and lower sides of the linkage frame pivotally connected to the sides of the backrest frame and the rear wheel frame, respectively; the control frame is located on both sides of the rear wheel frame, rotatably mounted on the side of the rear wheel frame, with a locking hook at the upper end of the control frame that can engage with the locking parts; the control frame is also connected to a control cable, and pulling the control cable can separate the locking hook from the locking parts, allowing the rear wheel frame to rotate towards the front wheel frame, and causing the linkage frame to pull the backrest frame towards the seat cushion frame for synchronous folding.

[0009] In this technical solution, the wheelchair folding frame adopts a linkage folding structure. By rotating the control frame, the locking hook part is separated from the locking part, which can quickly unlock the frame. After unlocking, the rear wheel frame can rotate to the side of the front wheel frame to fold the rear wheel frame. At the same time, the rear wheel frame can drive the linkage frame to rotate during the rotation and folding process. The linkage frame can pull the backrest frame to rotate to the side of the seat cushion frame, so that the backrest can be folded synchronously. When the rear wheel frame rotates to the rear end of the frame to unfold, the linkage frame can simultaneously drive the backrest to unfold upward. After unfolding, the locking hook part at the upper end of the control frame re-engages with the locking part to form an unfolded and fixed frame. The unfolding and folding operations are quick and convenient.

[0010] Preferably, the bottom of both sides of the rear end of the seat frame is provided with abutment parts, and the two sides of the linkage frame are provided with abutment platforms corresponding to the abutment parts. When the rear wheel frame rotates and unfolds to the side away from the front wheel frame, the abutment parts abut against the abutment platforms.

[0011] Preferably, the rear wheel frame is provided with a return spring connected to the control frame, so that the control frame can automatically return to its original position under the elastic force of the return spring after being pulled by the control cable.

[0012] Preferably, the rear ends of the seat cushion frame are provided with upwardly extending connecting parts on both sides, and the upper end of the connecting part is provided with a locking groove. The lower end of the backrest frame is provided with a locking head supported by an elastic element. The locking head can be inserted into the locking groove under the support of the elastic element. The locking head is also connected to the control frame through a linkage line. Pulling the control cable can make the control frame rotate, and at the same time the linkage line pulls the locking head to make the locking head disengage from the locking groove.

[0013] Preferably, the rear wheel frame is provided with a rotatable control pedal, which is connected to the end of a control cable away from the control frame. When the control pedal is pressed and rotated, the control cable can pull the control frame to rotate.

[0014] Preferably, the inner side of the linkage frame is provided with a limiting post, which is movably engaged with a limiting groove provided on the control frame. The limiting groove is arranged along the movement path of the limiting post as it rotates with the linkage frame. The bottom of the limiting groove is provided with a locking groove for the limiting post to be engaged. When the locking hook is separated from the locking part, the limiting post simultaneously exits the locking groove.

[0015] Preferably, armrests are pivotally connected to both sides of the backrest frame, and support frames are pivotally connected to both sides of the seat cushion frame below the armrests. The upper end of the support frame is rotatably engaged with the armrest through a support block, so that the armrest and the support frame can be folded or unfolded synchronously with the rotation of the backrest frame.

[0016] The present invention also provides an electric wheelchair, including the aforementioned wheelchair folding frame. Specifically, front wheel sets are installed on the bottom sides of the front wheel frame, and electric drive assemblies are installed on the bottom sides of the rear wheel frame. The output end of the electric drive assembly is equipped with the rear wheel sets. The electric drive assembly is electrically connected to a controller and a power module. The controller is signal-connected to a control operation terminal located at the front end of one of the armrests.

[0017] Preferably, the lower end of the front wheel frame is provided with a foot pedal between the two front wheel sets, the bottom of the foot pedal is provided with a foot pedal wheel set, the rear end of the foot pedal is provided with a connecting section, and the connecting section is pivotally connected to the foot pedal frame located between the two sides of the front wheel frame; the two ends of the rear wheel frame are provided with anti-tilt parts located between the two rear wheel sets, and the bottom of the anti-tilt parts is provided with anti-tilt wheel sets.

[0018] Preferably, a protective shell for mounting the controller and power module is provided below the seat cushion frame, a protective frame is provided at the bottom of the protective shell, the protective frame is fixedly connected to the seat cushion frame, and a rear light assembly connected to the controller signal is provided on the end face of the protective shell corresponding to the rear of the wheelchair.

[0019] The beneficial effects of this invention are:

[0020] This invention allows for simultaneous unlocking of both the rear wheel frame and backrest frame using a single control cable. When the rear wheel frame folds forward, the backrest frame flips forward simultaneously via the linkage mechanism, and the armrests automatically fold with the linkage mechanism. The entire vehicle can be folded in a single operation, eliminating the need to manually operate multiple latches or lift hands and cushions. Combined with a foot-operated unlocking structure, the user can unlock the wheel with a single foot pedal, overcoming the drawbacks of traditional folding wheelchairs such as multiple operation steps.

[0021] This invention employs a four-fold limiting and locking system: a main locking hook, a backrest locking head, a limiting slot, and a rigid support. The locking hook and locking part constitute the main locking of the frame; the locking head and locking groove ensure the upright stability of the backrest; the limiting post engages with the locking slot to form an auxiliary limiting; and the abutment part and abutment platform tightly abut against each other to eliminate assembly gaps. The combined effect of these multiple structures completely avoids the lateral swaying problem of traditional sliding folding frames, significantly improving ride support stiffness and ride smoothness, and enhancing safety. Simultaneously, the return spring automatically locks the frame after unfolding, eliminating the need for manual locking. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the unfolded folding wheelchair frame provided in Embodiment 1 of the present invention.

[0024] Figure 2 For the present invention Figure 1 A magnified view of a portion of the image.

[0025] Figure 3 This is a folding diagram of a wheelchair folding frame provided in Embodiment 1 of the present invention.

[0026] Figure 4 For the present invention Figure 3 A magnified view of a portion of the image.

[0027] Figure 5 This is a schematic diagram of the structure of the electric wheelchair provided in Embodiment 2 of the present invention.

[0028] Reference numerals: Front wheel frame 100, footrest frame 110, rear wheel frame 200, anti-rollover part 210, anti-rollover wheel assembly 211, seat frame 300, locking part 310, abutment part 320, connecting part 330, locking groove 331, backrest frame 400, linkage frame 500, abutment platform 510, limit post 520, control frame 600, locking hook part 610, limit groove 620, locking groove 621, control cable 700, return spring 800, Locking head 900, Linkage line 910, Control pedal 1000, Handrail 1100, Support frame 1200, Support block 1300, Front wheel assembly 1400, Electric drive assembly 1500, Rear wheel assembly 1510, Control operation terminal 1600, Power module 1700, Foot pedal 1800, Pedal wheel assembly 1810, Connecting section 1820, Protective shell 1900, Protective frame 2000, Side light assembly 2100. Detailed Implementation

[0029] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0030] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by those skilled in the art to which this invention pertains.

[0031] Example 1

[0032] like Figure 1 As shown, a specific embodiment of the present invention provides a folding wheelchair frame, suitable for the frame body of manual or electric wheelchairs, which can realize synchronous linkage folding of the frame and backrest, convenient operation and reliable locking; specifically, it includes a front wheel frame 100, a rear wheel frame 200, a seat cushion frame 300 and a linkage mechanism; the front wheel frame 100 and the rear wheel frame 200 are located below the seat cushion frame 300, the upper two sides of the front wheel frame 100 are fixed to the two sides of the seat cushion frame 300, and the upper two sides of the rear wheel frame 200 are pivotally connected to the two sides of the seat cushion frame 300; the rear end of the seat cushion frame 300 is provided with a backrest frame 400, and the lower two sides of the backrest frame 400 are pivotally connected to the seat cushion frame 300.

[0033] like Figure 1 and Figure 2 As shown, the two inner sides of the rear end of the seat cushion frame 300 are also provided with locking parts 310 for locking and positioning after the frame is unfolded; the linkage mechanism includes a linkage frame 500 and a control frame 600. The upper and lower ends of the linkage frame 500 are pivotally connected to the two sides of the backrest frame and the two sides of the rear wheel frame 200, respectively. The control frame 600 is provided with two sets, which are rotatably installed on the inner walls of the two sides of the rear wheel frame 200. The upper end of the control frame 600 is provided with a locking hook part 610 that can be engaged with the locking part 310. The locking hook part 610 can be engaged with the locking part 310 of the seat cushion frame 300 as the control frame 600 rotates, forming a lock in the unfolded state. The control frame 600 is also connected to a control cable 700. Pulling the control cable 700 can separate the locking hook part 610 from the locking part 310, allowing the rear wheel frame 200 to rotate to the side of the front wheel frame 100, and causing the linkage frame 500 to pull the backrest frame 400 to rotate to the side of the seat cushion frame 300 for synchronous folding.

[0034] With the above configuration, the wheelchair folding frame in this embodiment adopts a linkage folding structure. By rotating the control frame 600, the locking hook 610 is separated from the locking part 310, achieving quick unlocking. After unlocking, the rear wheel frame 200 can rotate to the side of the front wheel frame 100 to fold the rear wheel frame 200. At the same time, during the rotation and folding process, the rear wheel frame 200 can drive the linkage frame 500 to rotate. The linkage frame 500 can pull the backrest frame 400 to rotate to the side of the seat cushion frame 300, so that the backrest can be folded simultaneously. When the rear wheel frame 200 rotates to the rear end of the frame to unfold, the linkage frame 500 can simultaneously drive the backrest to unfold upward. After unfolding, the locking hook 610 at the upper end of the control frame 600 re-engages with the locking part 310 to form an unfolding and fixing of the frame. The unfolding and folding operations are quick and convenient. Here, the control cable 700 uses a sleeved cable harness, which includes an outer protective sleeve and an inner cable core. The outer sleeve is fixed to the rear wheel frame 200, and the inner cable core is connected to the control frame 600, which can prevent the cable from getting stuck and improve the smoothness of operation.

[0035] like Figure 3 and Figure 4 As shown, in order to ensure the stability of the frame after it is unfolded, this embodiment provides abutment parts 320 at the bottom of both sides of the rear end of the seat frame 300, and abutment platforms 510 arranged on both sides of the linkage frame 500 corresponding to the abutment parts 320. In this way, when the rear wheel frame 200 rotates and unfolds away from the front wheel frame 100 until the entire frame is fully unfolded, the abutment parts 320 and the abutment platforms 510 abut against each other. The abutment parts 320 and the abutment platforms 510 can eliminate the gap in the frame and prevent the frame from shaking. At the same time, the abutment platforms 510 and the abutment parts 320 abut against each other to ensure the support stability and reliability of the seat frame 300.

[0036] In another embodiment, an elastic rubber pad (not shown in the figure) is added to the mating surface between the abutment part 320 and the abutment platform 510 to further absorb driving vibrations and reduce abnormal noises, which is suitable for electric wheelchairs.

[0037] like Figure 2 As shown, in this embodiment, a return spring 800 connected to the control frame 600 is provided on the rear wheel frame 200, so that the control frame 600 can automatically return to its original position under the elastic force of the return spring 800 after being pulled by the control cable 700. In this way, when the frame needs to be unfolded again after being folded, the control frame 600 returns to the locked position under the elastic force of the return spring 800. After the folded frame is unfolded, the locking part 310 can re-fit with the locking hook part 610 to form a quick lock on the frame.

[0038] To improve the stability of the backrest frame 400 in its unfolded state, the rear of the seat cushion frame 300 has upwardly extending connecting portions 330 on both sides, with locking grooves 331 at the upper end of the connecting portions 330. Locking heads 900 are correspondingly provided on both sides of the lower end of the backrest frame 400. The locking heads 900 are supported and installed within the backrest frame 400 by elastic elements, which can be compression springs. Under normal conditions, the locking heads 900 are pushed outwards and engaged in the locking grooves 331, thus locking the backrest frame 400 in its unfolded state. The locking heads 900 are also connected to a linkage line 910, the other end of which is connected to the control frame 600. When the control cable 700 is pulled to drive the control frame 600 to rotate and unlock, the locking heads 900 are simultaneously pulled via the linkage line 910 to compress the elastic elements, causing the locking heads 900 to disengage from the locking grooves 331, thus unlocking the backrest frame 400. This achieves simultaneous unlocking of the rear wheel frame and the backrest, further simplifying the folding operation.

[0039] like Figure 1As shown, to facilitate user operation and unlocking, a control pedal 1000 is rotatably mounted on the lower part of the rear wheel frame 200, and the end of the control cable 700 away from the control frame 600 is connected to the control pedal 1000. By stepping on the control pedal 1000, the user can drive the control cable 700 to pull the control frame 600 to rotate, thus unlocking the entire vehicle. This eliminates the need for manual operation by bending over, making it suitable for elderly users with limited mobility or weak muscles.

[0040] like Figure 2 As shown, to ensure the stability of the linkage frame 500 and control frame 600 during rotation, this embodiment provides a limiting post 520 inside the linkage frame 500. The limiting post 520 is movably engaged with a limiting groove 620 on the control frame 600. The limiting groove 620 is arranged along the movement path of the limiting post 520 as the linkage frame 500 rotates. The bottom of the limiting groove 620 is provided with a locking groove 621 for the limiting post 520 to engage. When the locking hook separates from the locking part 310, the limiting post 520 simultaneously exits the locking groove 621. In this way, after the locking hook part 610 of the control frame 600 is released, the linkage frame 500 can slide stably along the limiting groove 620, thereby controlling the folding of the backrest frame 400. Furthermore, when the frame is unfolded, the limiting post 520 can slide into the locking groove 621 at the bottom of the limiting position, ensuring the stability of the linkage frame 500 and preventing the linkage frame 500 from shaking.

[0041] like Figure 1 As shown, armrests 1100 are pivotally connected to both sides of the backrest frame 400, and support frames 1200 are pivotally connected to both sides of the seat cushion frame 300 below the armrests 1100. The upper end of the support frame 1200 is rotatably engaged with the armrests 1100 through a support block 1300. In this way, since both the armrests 1100 and the support frames 1200 are movable, the armrests 1100 and the support frames 1200 can be folded or unfolded synchronously with the rotation of the backrest frame 400, so that the armrests 1100 do not need to be folded or unfolded separately.

[0042] The folding process in this embodiment is as follows:

[0043] When folding, the user steps on the control pedal 1000, which pulls the control frame 600 to rotate via the control cable 700. This causes the locking hook 610 to disengage from the locking part 310, unlocking the rear wheel frame 200. Simultaneously, the locking head 900 is pulled out of the locking groove 331 via the linkage cable 910, unlocking the backrest frame 400. At the same time, the limiting post 520 disengages from the locking groove 621, releasing the limiting position of the linkage frame 500. The rear wheel frame 200 is then pushed forward, causing it to rotate around the upper pivot point towards the front wheel frame 100. During this rotation, the backrest frame 400 is pulled forward and flipped synchronously via the linkage frame 500. The armrest 1100 folds down synchronously with the linkage structure, ultimately completing the folding of the entire vehicle.

[0044] When unfolded, pull the rear wheel frame 200 backward to make it rotate in the opposite direction and unfold. The linkage frame 500 simultaneously pushes the backrest frame 400 to stand up. When the frame is fully unfolded, the control frame 600 rotates under the action of the return spring 800. The locking hook part 610 automatically engages with the locking part 310. The locking head 900 engages with the locking groove 331 under the action of the elastic element. The limit post 520 engages with the locking groove 621. The whole vehicle automatically completes multiple locking and can be used normally.

[0045] Example 2

[0046] like Figure 5 As shown, the present invention also provides an electric wheelchair, which adopts the wheelchair folding frame described in Embodiment 1, and further includes a walking drive system, a foot pedal assembly, an electronic control system, and a protective structure.

[0047] Front wheel assemblies 1400 are mounted on the bottom of both sides of the front wheel frame 100, and electric drive assemblies 1500 are mounted on the bottom of both sides of the rear wheel frame 200. Rear wheel assemblies 1510 are mounted on the output end of the electric drive assemblies 1500. The electric drive assemblies 1500 are electrically connected to a controller and a power module 1700. A control terminal 1600 is mounted on the front end of one armrest 1100 and is signal-connected to the controller. By operating the control terminal 1600, the user can send commands to the controller to control the speed and steering of the two electric drive assemblies 1500, thus enabling the wheelchair to move forward, backward, and turn.

[0048] A foot pedal 1800 is located at the lower end of the front wheel frame 100, between the two front wheel sets 1400. A connecting section 1820 is provided at the rear end of the foot pedal 1800. The connecting section 1820 is pivotally connected to the footrest frame 110 located between the two sides of the front wheel frame 100, allowing the foot pedal 1800 to be flipped upwards and folded. A foot pedal wheel set 1810 is provided at the bottom of the foot pedal 1800, which can form rolling support when the foot pedal is unfolded, improving load-bearing capacity and riding smoothness.

[0049] At both ends of the rear wheel frame 200 and between the two sets of rear wheel sets 1510, there are rearward-extending anti-tilt sections 210, and anti-tilt wheel sets 211 are installed at the bottom of the anti-tilt sections 210. When the wheelchair is traveling on a ramp or leaning back, the anti-tilt wheel sets 211 can contact the ground to form a tail support, preventing the wheelchair from tipping backward and improving the safety of use.

[0050] A protective shell 1900 is located below the seat frame 300. The controller and power module 1700 are both installed inside the protective shell 1900. A protective frame 2000 is located at the bottom of the protective shell 1900, with its upper end fixedly connected to the bottom of the seat frame 300, forming a protective enclosure for the electronic components to prevent damage from impacts or water ingress during use. A rear light assembly connected to the controller is located on the end face of the protective shell 1900 corresponding to the rear of the wheelchair. This light assembly can be used as a brake light and parking light, further improving driving safety at night or in low-light environments. In other embodiments, strip-shaped light slots are also provided on the left and right outer sides of the seat frame 300. Side lights 2100 are installed in these slots and are connected to the controller. They can be controlled via an operating control terminal. When the side lights 2100 are turned on, they serve as an indicator, reducing the risk of the electric wheelchair being harmed by other pedestrians or vehicles, thereby further improving driving safety in low-light environments.

[0051] The electric wheelchair in this embodiment retains all the linkage folding functions of Embodiment 1. When folding, the electronic control components fold synchronously with the vehicle structure. After folding, the overall volume is compact, making it easy to put into the trunk of a car for vehicle transportation. At the same time, it has the convenience of electric driving and high safety, making it suitable for various usage scenarios such as outdoor travel and daily commuting.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A folding wheelchair frame, comprising a front wheel frame (100), a rear wheel frame (200), a seat cushion frame (300), and a linkage mechanism; wherein the front wheel frame (100) and the rear wheel frame (200) are located below the seat cushion frame (300), the upper ends of the front wheel frame (100) are fixed to the sides of the seat cushion frame (300), and the upper ends of the rear wheel frame (200) are pivotally connected to the sides of the seat cushion frame (300); a backrest frame (400) is provided at the rear end of the seat cushion frame (300), and the lower ends of the backrest frame (400) are pivotally connected to the sides of the seat cushion frame (300); characterized in that, The seat cushion frame (300) is also provided with locking parts (310) on the two inner sides of its rear end; The linkage mechanism includes a linkage frame (500) and a control frame (600). The upper and lower ends of the linkage frame (500) are pivotally connected to the two sides of the backrest frame (400) and the two sides of the rear wheel frame (200), respectively. The control frame (600) is located on both sides of the rear wheel frame (200) and is rotatably mounted on the side of the rear wheel frame (200). The upper end of the control frame (600) is provided with a locking hook (610) that can engage with the locking part (310). The control frame (600) is also connected to a control cable (700). Pulling the control cable (700) can separate the locking hook (610) from the locking part (310), allowing the rear wheel frame (200) to rotate towards the front wheel frame (100) and the linkage frame (500) to pull the backrest frame (400) towards the seat cushion frame (300) for synchronous folding.

2. The wheelchair folding frame according to claim 1, characterized in that, The seat cushion frame (300) has abutment parts (320) at the bottom of both sides of the rear end, and abutment platforms (510) are arranged on both sides of the linkage frame (500) corresponding to the abutment parts (320). When the rear wheel frame (200) rotates and unfolds to the side away from the front wheel frame (100), the abutment parts (320) abut against the abutment platforms (510).

3. The wheelchair folding frame according to claim 1, characterized in that, The rear wheel frame (200) is provided with a return spring (800) connected to the control frame (600), so that the control frame (600) can automatically reset under the elastic force of the return spring (800) after being pulled by the control cable (700).

4. The wheelchair folding frame according to claim 1, characterized in that, The seat cushion frame (300) has connecting parts (330) extending upward on both sides of its rear end. The upper end of the connecting part (330) is provided with a locking groove (331). The lower end of the backrest frame (400) is provided with a locking head (900) supported by an elastic element. The locking head (900) can be inserted into the locking groove (331) under the support of the elastic element. The locking head (900) is also connected to the control frame (600) through a linkage line (910). Pulling the control pull line (700) can make the control frame (600) rotate. At the same time, the linkage line (910) pulls the locking head (900) to make the locking head (900) exit the locking groove (331).

5. The wheelchair folding frame according to claim 1, characterized in that, The rear wheel frame (200) is provided with a rotatable control pedal (1000). The control pedal (1000) is connected to the end of the control cable (700) away from the control frame (600). When the control pedal (1000) is pressed and rotated, the control cable (700) can pull the control frame (600) to rotate.

6. The wheelchair folding frame according to claim 1, characterized in that, The inner side of the linkage frame (500) is provided with a limiting post (520), which is movably engaged with the limiting groove (620) provided on the control frame (600). The limiting groove (620) is arranged along the movement path of the limiting post (520) as the linkage frame (500) rotates. The bottom of the limiting groove (620) is provided with a locking groove (621) for the limiting post (520) to be engaged. When the locking hook is separated from the locking part (310), the limiting post (520) simultaneously exits the locking groove (621).

7. The wheelchair folding frame according to claim 1, characterized in that, An armrest (1100) is pivotally connected to each side of the backrest frame (400), and a support frame (1200) is pivotally connected to each side of the seat cushion frame (300) below the armrest (1100). The upper end of the support frame (1200) and the armrest (1100) are rotatably engaged by a support block (1300), so that the armrest (1100) and the support frame (1200) can be folded or unfolded synchronously with the rotation of the backrest frame (400).

8. An electric wheelchair, characterized in that, The wheelchair folding frame includes the one described in any one of claims 1-7, wherein front wheel assemblies (1400) are mounted on the bottom sides of the front wheel frame (100), and electric drive assemblies (1500) are mounted on the bottom sides of the rear wheel frame (200). The output end of the electric drive assembly (1500) is equipped with a rear wheel assembly (1510). The electric drive assembly (1500) is electrically connected to a controller and a power module (1700). The controller is signal-connected to a control operation terminal (1600) located at the front end of one of the armrests (1100).

9. The electric wheelchair according to claim 8, characterized in that, The lower end of the front wheel frame (100) is provided with a foot pedal (1800) between the two front wheel sets (1400), the bottom of the foot pedal (1800) is provided with a foot pedal wheel set (1810), the rear end of the foot pedal is provided with a connecting section (1820), the connecting section (1820) is pivotally connected to the foot pedal frame (110) located between the two sides of the front wheel frame (100); the two ends of the rear wheel frame (200) are provided with anti-rolling parts (210) located between the two rear wheel sets (1510), and the bottom of the anti-rolling part (210) is provided with an anti-rolling wheel set (211).

10. The electric wheelchair according to claim 8, characterized in that, The seat cushion frame (300) is provided with a protective shell (1900) for installing the controller and power module (1700) below it. The protective shell (1900) is provided with a protective frame (2000) at the bottom. The protective frame (2000) is fixedly connected to the seat cushion frame (300). The protective shell (1900) is provided with a rear light assembly connected to the controller signal on the end face of the wheelchair corresponding to the rear of the wheelchair.

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