An electrically powered wheelchair

Abstract

The application relates to the technical field of travelling tools, and discloses an electric wheelchair, which comprises a seat assembly, a front wheel, a rear wheel folding assembly and a driving member, wherein the rear wheel folding assembly comprises a first connecting seat, a front connecting rod, a rear driving push rod, a main beam frame, a connecting beam frame and a rear wheel; the upper end of the front connecting rod and the upper end of the main beam frame are sequentially rotationally connected to the first connecting seat in the front-rear direction; the lower end of the front connecting rod and the front end of the connecting beam frame are respectively rotationally connected to the lower end of the main beam frame; the two ends of the rear driving push rod are respectively rotationally connected to the upper end of the main beam frame and the connecting beam frame; the rear wheel is connected to the connecting beam frame; the seat assembly is detachably connected to the first connecting seat; the lower end of the main beam frame is detachably connected to the front wheel; and the driving member is at least in transmission connection with the rear wheel. The electric wheelchair of the application can be integrally folded without disassembly, so that the loss of parts is prevented; the electric wheelchair can also be disassembled into several parts and then folded, so that the storage requirement of a smaller space is met, and the electric wheelchair is convenient to carry.

Description

Technical Field

[0001] This invention relates to the technical field of transportation tools, and in particular to an electric wheelchair. Background Technology

[0002] To facilitate transportation and storage, existing electric wheelchairs are designed as a single, foldable unit. While this reduces their overall size when folded, it results in a heavy weight, making them inconvenient to store and move. Another approach is to disassemble the wheelchair before folding it, breaking it down into several parts for easier storage and transport. However, this method involves numerous disassembled parts that are prone to loss and is not user-friendly for those with limited assembly skills, failing to meet the needs of a variety of users simultaneously. Summary of the Invention

[0003] The purpose of this invention is to provide an electric wheelchair that, when storage space is sufficient, can be folded in one piece without disassembly to prevent the loss of parts, and does not require reassembly when used again. When storage space is limited, the electric wheelchair can be disassembled into several parts and then folded to meet the storage needs of limited space and facilitate transportation.

[0004] To achieve the above objectives, the present invention provides an electric wheelchair, including a seat assembly, a front wheel, a rear wheel folding assembly, and a drive unit. The rear wheel folding assembly includes a first connecting seat, a front connecting rod, a rear drive push rod, a main beam frame, a connecting beam frame, and a rear wheel. The upper end of the front connecting rod and the upper end of the main beam frame are rotatably connected to the first connecting seat in a front-rear direction. The lower end of the front connecting rod and the front end of the connecting beam frame are rotatably connected to the lower end of the main beam frame, respectively. The two ends of the rear drive push rod are rotatably connected to the upper end of the main beam frame and the connecting beam frame, respectively. The rear wheel is connected to the connecting beam frame. The seat assembly is detachably connected to the first connecting seat. The lower end of the main beam frame is detachably connected to the front wheel. The drive unit is at least kinetically connected to the rear wheel.

[0005] As a preferred embodiment, the seat assembly includes a backrest, a seat cushion, and a seat connecting part. The backrest is connected to the rear end of the seat cushion, and the seat connecting part is connected to the end of the seat cushion facing the first connecting seat. The first connecting seat and the seat connecting part are slidably installed in the front-back direction.

[0006] As a preferred embodiment, the first connecting seat is provided with a forward-opening insertion slot, the seat connecting part is provided with an insertion block corresponding to the position of the insertion slot, the insertion block is slidably installed in the insertion slot, the front end of the seat connecting part is provided with a downwardly extending seat limiting part, the seat limiting part is connected to the front end of the insertion block, the front end of the first connecting seat is provided with a locking part, the seat limiting part is located at the front end of the insertion slot and is detachably connected to the locking part.

[0007] As a preferred embodiment, the seat limiting part is provided with a downward-facing locking slot. The locking part includes a positioning rod and an eccentric locking rod. The first end of the positioning rod is rotatably connected to the first connecting seat, and the second end of the positioning rod extends out of the front end of the first connecting seat. The eccentric locking rod is rotatably connected to the second end of the positioning rod. The positioning rod is installed in the locking slot. The peripheral side of the eccentric locking rod is provided with a locking surface. When the locking surface is in contact with the seat limiting part, the seat limiting part is limited between the locking surface and the first connecting seat.

[0008] As a preferred embodiment, the bottom of the first connecting seat is provided with a locking extension arm located below the insertion slot and extending forward. The locking part includes an operating push rod and a locking rod. The upper end of the operating push rod is rotatably connected to the locking extension arm. The locking rod extends along the width direction and is connected to the operating push rod. The seat limiting part is located between the front end of the insertion slot and the locking rod. The operating push rod rotates backward, and the outer peripheral surface of the locking rod abuts against the front end of the seat limiting part for locking.

[0009] As a preferred embodiment, when the operating push rod extends downward, a locking clearance channel is formed above the locking rod, and the seat limiting part is installed in the insertion slot through the locking clearance channel.

[0010] As a preferred embodiment, the seat connecting part is provided with a seat unlocking part located at the front end of the seat locking part. The upper end of the seat unlocking part is connected to the front end of the plug block, and the lower end of the seat unlocking part extends downward to form an unlocking end. The locking part is located between the seat locking part and the seat unlocking part in the front-back direction. The operating push rod rotates forward and pushes the unlocking end forward.

[0011] As a preferred embodiment, the insertion slot includes two oppositely arranged slot sidewalls and a slot bottom surface. The slot bottom surface is connected to the lower end of the slot sidewalls on both sides in the width direction. The rear width of the slot bottom surface is smaller than the front width of the slot bottom surface. The shape of the insertion block matches the shape of the insertion slot.

[0012] As a preferred embodiment, the groove sidewall is provided with a first limiting inclined surface, and the two opposite sides of the plug block are respectively provided with second limiting inclined surfaces, and the first limiting inclined surface and the second limiting inclined surface are in close contact.

[0013] As a preferred embodiment, the plug slot includes a slot end face, the slot end face is provided with a first terminal, and the plug block is provided with a second terminal facing the slot end face, the first terminal and the second terminal are plugged into and electrically connected.

[0014] As a preferred embodiment, the rear wheel folding assembly includes a power supply and a controller, which are electrically connected to the first terminal, and the seat assembly includes an operating handle, which is electrically connected to the second terminal.

[0015] As a preferred embodiment, the lower end of the main beam frame is provided with a first connecting rod and a latch, the front wheel includes a second connecting rod and a connecting arm extending toward the first connecting rod, the connecting arm is provided with a first connecting part, the first connecting part is detachably connected to the first connecting rod, and the latch is detachably connected to the first connecting rod.

[0016] As a preferred embodiment, the lower end of the main beam frame is provided with an assembly cavity that opens downwards, and the first connecting rod is connected to the latch in the assembly cavity.

[0017] As a preferred embodiment, the first connecting rod is connected to the rear end of the assembly cavity, and the latch is rotatably connected to the front end of the assembly cavity around the width direction. The latch is a hook structure. The lower end of the main beam frame is provided with a downward-opening limiting groove. The second connecting rod is installed in the limiting groove. When the latch locks the second connecting rod, one side wall of the limiting groove is correspondingly positioned with the latch in the front-rear direction when locked. The second connecting rod is located between the bottom surface of the limiting groove and the latch in the height direction. The first connecting part is a groove structure with the opening facing the rear end.

[0018] As a preferred embodiment, the seat assembly includes a bottom support, a first rod, a second rod, and an armrest. The backrest is detachably connected to the bottom support. One end of the bottom support is connected to the seat cushion, and the other end of the bottom support is provided with a first rotating part and a second rotating part. One end of the first rod is rotatably connected to the first rotating part to form a first axis. The other end of the first rod is rotatably connected to one end of the second rod to form a second axis. The other end of the second rod is rotatably connected to the armrest and the backrest to form a third axis. The backrest and the second rotating part are rotatably connected to form a fourth axis.

[0019] The first axis, the second axis, the third axis, and the fourth axis extend along the width direction and are arranged in parallel. The first axis, the second axis, the third axis, and the fourth axis are projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point, and a fourth projection point, respectively. The first projection point, the second projection point, the third projection point, and the fourth projection point are connected sequentially on the projection surface to form a quadrilateral.

[0020] As a preferred embodiment, at least one side of the chair back is provided with a chair back connecting portion, the chair back connecting portion including a connecting post and a first limiting block, the first limiting block being located on the outer periphery of the connecting post and having a first mating surface for the chair back; one end of the second rod is provided with a second limiting block and a rod ring, the second limiting block being located on the edge of the rod ring and having a first mating surface for the rod; one end of the armrest is provided with an armrest ring and a third limiting block, the third limiting block having a first mating surface for the armrest and a second mating surface for the armrest, the first mating surface for the armrest and the second mating surface for the armrest being mated. A rotational notch is formed between the mating surfaces in the circumferential direction. The first limiting block and the second limiting block are located in the rotational notch. The connecting column, the rod ring, and the armrest ring are coaxially rotatably connected. The second limiting block is located radially between the armrest ring and the first limiting block. The armrest includes a used state and a folded state. When the armrest is in the used state, the first mating surface of the chair back is in contact with the first mating surface of the armrest. When the armrest is in the folded state, the first mating surface of the rod ring is in contact with the first mating surface of the armrest, and the first mating surface of the chair back is separated from the first mating surface of the armrest.

[0021] As a preferred embodiment, the first limiting block is provided with a second limiting surface of the chair back, and the armrest includes a yielding state. When the armrest is in the yielding state, the second mating surface of the armrest is in contact with the second limiting surface of the chair back, and a side access channel is formed between the armrest and the side of the seat cushion.

[0022] As a preferred embodiment, when the handrail is in use, there is a gap between the first mating surface of the rod and the first mating surface of the handrail.

[0023] As a preferred embodiment, the main beam frame includes a main side rod, an upper connecting rod, and a lower connecting rod. The upper connecting rod and the lower connecting rod extend along the width direction, and the two ends of the upper connecting rod and the two ends of the lower connecting rod are connected to the main side rod to form a frame structure. The two ends of the front connecting rod are rotatably connected to the front end of the lower connecting rod and the first connecting seat, respectively. The two ends of the rear drive push rod are rotatably connected to the upper connecting rod and the connecting beam frame, respectively.

[0024] As a preferred embodiment, the connecting beam frame includes a bottom connecting rod, a middle support connecting rod, and a rear connecting plate. The bottom connecting rod extends in the front-to-back direction. The middle support connecting rod and the rear connecting plate are respectively connected to the bottom connecting rod on both sides in the width direction. The front end of the bottom connecting rod is rotatably connected to the lower end of the main beam frame, and the lower end of the rear drive push rod is rotatably connected to the middle support connecting rod.

[0025] As a preferred embodiment, the bottom connecting rod includes a first segment and a second segment. The first segment extends upward at an incline. The upper end of the first segment is rotatably connected to the lower end of the main beam frame. The lower end of the first segment is connected to the front end of the second segment. The rear end of the second segment is fixedly connected to the rear connecting plate.

[0026] As a preferred embodiment, the rear connecting plate is provided with bottom connecting plates on both sides in the width direction. The bottom connecting plates are rotatably connected to the rear connecting plate in the front-rear direction, and the side of the bottom connecting plate away from the rear connecting plate is connected to the rear wheel.

[0027] Compared with existing technologies, the electric wheelchair of this invention has the following advantages: it includes a seat assembly, front wheels, a rear wheel folding assembly, and a drive unit. The user sits on the seat assembly, which carries the user. The rear wheel folding assembly supports the seat assembly and allows for angle and height adjustments. Specifically, the rear wheel folding assembly includes a first connecting seat, a front connecting rod, a rear drive push rod, a main beam frame, a connecting beam frame, and rear wheels. The upper ends of the front connecting rod and the main beam frame are rotatably connected to the first connecting seat in the front-rear direction. The lower ends of the front connecting rod and the front end of the connecting beam frame are rotatably connected to the lower end of the main beam frame. The two ends of the rear drive push rod are rotatably connected to the upper end of the main beam frame and the connecting beam frame, respectively. When the wheelchair goes uphill, the rear drive push rod extends; when the wheelchair goes downhill, the rear drive push rod shortens, compensating for the angle of the seat assembly to adjust the center of gravity. This ensures that the seat assembly remains parallel or nearly parallel to the ground when going uphill or downhill, improving user comfort when using the wheelchair. The rear drive pushrod is shortened, allowing the rear wheel folding assembly to fold as a whole. The seat assembly and front wheels are each connected to the rear wheel folding assembly to form a folded unit, facilitating storage and transportation while preventing component loss. Reassembly is unnecessary for reuse, making it convenient to use. The bottom of the seat assembly is detachably connected to the first connecting seat, and the lower end of the main beam frame is detachably connected to the front wheel. When storage space is insufficient to accommodate the entire folded unit, the seat assembly is detached from the first connecting seat, and the main beam frame is detached from the front wheel. The seat assembly, front wheel, and folded rear wheel folding assembly form three main components, each with a smaller footprint and reduced weight to meet the needs of small-space storage and easy transport. Furthermore, there are no restrictions on the order of assembly, disassembly, and folding of the seat assembly, front wheels, and rear wheel folding assembly. They can be disassembled before folding, or folded before disassembly, or the seat assembly and rear wheel folding assembly can be assembled or disassembled first, and then the rear wheel folding assembly and front wheels can be assembled or disassembled, or the rear wheel folding assembly and front wheels can be assembled or disassembled first, and then the seat assembly and rear wheel folding assembly can be assembled or disassembled. This reduces the operational restrictions on wheelchair assembly and disassembly, and lowers the difficulty of wheelchair assembly and disassembly operations. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the folded state of an embodiment of the present invention.

[0030] Figure 3 This is a structural schematic diagram of the seat assembly according to an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the structure of the rear wheel folding assembly connected to the front wheel after folding, according to an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the rear wheel folding assembly after folding according to an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the front wheel structure in an embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the structure of the first connecting seat in an embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of the lower end of the first connecting seat in an embodiment of the present invention.

[0036] Figure 9 This is a structural schematic diagram of the seat connection part according to an embodiment of the present invention.

[0037] Figure 10 This is a structural schematic diagram of the seat connection part from another perspective in an embodiment of the present invention.

[0038] Figure 11 This is a schematic diagram of the structure of the seat connecting part and the first connecting seat according to another embodiment of the present invention.

[0039] Figure 12 This is a cross-sectional view of the seat connection portion and the first connecting seat in a locked state according to another embodiment of the present invention.

[0040] Figure 13 This is a schematic diagram of the structure of the first connecting seat according to another embodiment of the present invention.

[0041] Figure 14 This is a schematic diagram of the structure of the seat connection part according to another embodiment of the present invention.

[0042] Figure 15 This is a cross-sectional view of the seat connection portion and the first connecting seat in an unlocked state, according to another embodiment of the present invention.

[0043] Figure 16 This is a schematic diagram of the connection between the main beam frame and the front wheel in an embodiment of the present invention.

[0044] Figure 17 This is a structural schematic diagram of the main beam frame in an embodiment of the present invention.

[0045] Figure 18 This is a side view of the seat assembly according to an embodiment of the present invention.

[0046] Figure 19 This is an embodiment of the present invention. Figure 18 A magnified structural diagram of point A in the middle.

[0047] Figure 20 This is a schematic diagram of the overall structure of the seat assembly and the rear folding assembly in an embodiment of the present invention, both in a folded state.

[0048] Figure 21 This is an embodiment of the present invention. Figure 20 A magnified structural diagram of point B in the diagram.

[0049] Figure 22 This is a structural schematic diagram of the seat assembly in a folded state according to an embodiment of the present invention.

[0050] Figure 23 This is a schematic diagram of the structure of the chair back support according to an embodiment of the present invention.

[0051] Figure 24 This is a schematic diagram of the bottom support structure according to an embodiment of the present invention.

[0052] Figure 25 This is a schematic diagram of the handrail structure according to an embodiment of the present invention.

[0053] Figure 26 This is a schematic diagram of the structure of the second rod in an embodiment of the present invention.

[0054] Figure 27 This is a schematic diagram of the handrail in the yielding state according to an embodiment of the present invention.

[0055] Figure 28 This is an embodiment of the present invention. Figure 27 A magnified structural diagram at point C.

[0056] Figure 29 This is a partial structural schematic diagram of the rear wheel folding assembly according to an embodiment of the present invention.

[0057] Figure 30 This is a structural schematic diagram of the connecting beam frame according to an embodiment of the present invention.

[0058] In the picture:

[0059] 10. Seat assembly; 11. Seat back; 111. Seat back connecting part; 1111. Connecting column; 1112. First limiting block; 11121. First mating surface of the seat back; 11122. Second limiting surface of the seat back; 112. Seat back bracket; 113. Backrest; 12. Seat cushion; 121. Mounting slope; 13. Seat connecting part; 131. Insertion block; 1311. Second limiting slope; 1312. Second wiring terminal; 1313. Guide slope; 132. Seat limiting part; 1321. Locking slot; 1322. Locking guide slope; 133. Seat unlocking part; 331. Unlocking end; 1332. First unlocking part; 1333. Second unlocking part; 14. Bottom bracket; 141. First rotating part; 142. Second rotating part; 15. First rod; 16. Second rod; 161. Second limiting block; 1611. First mating surface of rod; 1612. Second mating surface of rod; 162. Rod ring; 163. Gap; 17. Handrail; 171. Handrail ring; 172. Third limiting block; 1721. First mating surface of handrail; 1722. Second mating surface of handrail; 173. Rotation notch; 18. Side access passage;

[0060] 20. Front wheel; 21. Second connecting rod; 22. Connecting arm; 23. First connecting part;

[0061] 30. Rear wheel folding assembly; 31. Front connecting rod; 32. Rear drive push rod; 33. Rear wheel; 34. First connecting seat; 341. Insertion groove; 3411. Groove sidewall; 3412. Groove bottom surface; 3413. Groove end face; 3414. First wiring terminal; 342. First limiting inclined surface; 343. Locking part; 3431. Positioning rod; 3432. Eccentric locking rod; 3433. Locking surface; 3434. Operating push rod; 3435. Locking rod; 3436. Locking avoidance 344. Locking extension arm; 35. Main beam frame; 351. First connecting rod; 352. Lock; 353. Assembly cavity; 354. Limiting groove; 355. Main side rod; 356. Upper connecting rod; 357. Lower connecting rod; 36. Connecting beam frame; 361. Bottom connecting rod; 3611. First rod segment; 3612. Second rod segment; 362. Middle support connecting rod; 363. Rear connecting plate; 364. Bottom connecting plate; 365. Wheel connecting bracket; 366. Buffer component;

[0062] 40. Driving components;

[0063] 50. Operating handle; 51. Power supply; 52. Controller;

[0064] 1. First axis; 2. Second axis; 3. Third axis; 4. Fourth axis. Detailed Implementation

[0065] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0066] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0067] In the description of this invention, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In the description of this invention, it should be understood that the vehicle's forward direction is the front-to-back direction, the direction perpendicular to the front-to-back direction is the left-to-right direction, i.e. the width direction, the width being the length extending along the width direction, and the vehicle's lifting direction is the height direction, the height being the length extending along the height direction.

[0069] like Figures 1 to 18 As shown, an electric wheelchair according to a preferred embodiment of the present invention includes a seat assembly 10, a front wheel 20, a rear wheel folding assembly 30, and a drive unit 40. The rear wheel folding assembly 30 includes a first connecting seat 34, a front connecting rod 31, a rear drive push rod 32, a main beam frame 35, a connecting beam frame 36, and a rear wheel 33. The upper end of the front connecting rod 31 and the upper end of the main beam frame 35 are rotatably connected to the first connecting seat 34 in the front-rear direction. The lower end of the front connecting rod 31 and the front end of the connecting beam frame 36 are rotatably connected to the lower end of the main beam frame 35, respectively. The two ends of the rear drive push rod 32 are rotatably connected to the upper end of the main beam frame 35 and the connecting beam frame 36, respectively. The rear wheel 33 is connected to the connecting beam frame 36. The seat assembly 10 is detachably connected to the first connecting seat 34. The lower end of the main beam frame 35 is detachably connected to the front wheel 20. The drive unit 40 is at least tractively connected to the rear wheel 33.

[0070] The electric wheelchair of the present invention includes a seat assembly 10, front wheels 20, a rear wheel folding assembly 30, and a drive unit 40. A user sits on the seat assembly 10, which carries the user. The rear wheel folding assembly 30 supports the seat assembly 10 and allows for angle and height adjustment. Specifically, the rear wheel folding assembly 30 includes a first connecting seat 34, a front connecting rod 31, a rear drive push rod 32, a main beam frame 35, a connecting beam frame 36, and a rear wheel 33. The upper ends of the front connecting rod 31 and the main beam frame 35 are rotatably connected to the first connecting seat 34 in a front-rear direction. The lower ends of the front connecting rod 31 and the front end of the connecting beam frame 36 are rotatably connected to the lower ends of the main beam frame 35. The two ends of the rear drive push rod 32 are rotatably connected to the upper ends of the main beam frame 35 and the connecting beam frame 36, respectively. When the wheelchair goes uphill, the rear drive push rod 32 extends; when the wheelchair goes downhill, the rear drive push rod 32 shortens. This provides angle compensation for the seat assembly 10 to adjust its center of gravity, ensuring that the seat assembly 10 remains parallel or nearly parallel to the ground during both uphill and downhill journeys, thus improving user comfort. When the rear drive push rod 32 shortens, the rear wheel folding assembly 30 folds completely. The seat assembly 10 and the front wheels 20 are connected to the rear wheel folding assembly 30 to form a folded unit, facilitating storage and transportation, preventing component loss, and eliminating the need for reassembly for reuse. The bottom of the seat assembly 10 is detachably connected to the first connecting seat 34, and the lower end of the main beam frame 35 is detachably connected to the front wheels 20. When the storage space is insufficient to accommodate the entire folded wheelchair, the seat assembly 10 can be disassembled from the first connecting seat 34, and the main beam frame 35 can be disassembled from the front wheel 20. The seat assembly 10, the front wheel 20, and the folded rear wheel assembly 30 form three main components. Each component occupies less space and is lighter, thus meeting the storage needs of small spaces and facilitating transportation. Furthermore, there are no restrictions on the order of assembly, disassembly, and folding of the seat assembly 10, the front wheel 20, and the rear wheel folding assembly 30. They can be disassembled before folding, or folded before disassembly, or the seat assembly 10 and the rear wheel folding assembly 30 can be assembled or disassembled first, and then the rear wheel folding assembly 30 and the front wheel 20 can be assembled or disassembled, or the rear wheel folding assembly 30 and the front wheel 20 can be assembled or disassembled first, and then the seat assembly 10 and the rear wheel folding assembly 30 can be assembled or disassembled. This reduces the operational limitations of wheelchair assembly and disassembly, and lowers the difficulty of wheelchair assembly and disassembly operations.

[0071] It should be noted that when the wheelchair is going uphill, the two ends of the front connecting rod 31 are connected to the first connecting seat 34 and the lower end of the main beam frame 35, respectively. The length of the front connecting rod 31 remains unchanged. The rear drive push rod 32 extends and drives the main beam frame 35 to rotate clockwise, which compensates for the angle of the seat assembly 10, so that the seat assembly 10 moves forward to adjust the center of gravity position, and the seat cushion 12 remains parallel or basically parallel to the ground.

[0072] When the wheelchair is going downhill, the length of the front connecting rod 31 remains unchanged, the rear drive push rod 32 shortens and drives the main beam frame 35 to rotate counterclockwise, compensating for the angle of the seat assembly 10, so that the seat assembly 10 moves backward to adjust the center of gravity position, and the seat cushion 12 remains parallel or basically parallel to the ground.

[0073] In one embodiment, the electric wheelchair includes an angle sensor and a controller 52. The angle sensor is mounted on the seat assembly 10, and the controller 52 is electrically connected to both the angle sensor and the rear drive push rod 32. The angle sensor receives angle change information from the seat assembly 10 and sends this information to the controller 52. The controller 52 controls the extension and retraction of the rear drive push rod 32 based on the angle change information to keep the seat cushion 12 parallel or substantially parallel to the ground.

[0074] In one embodiment, the electric wheelchair includes an operating handle 50, which is electrically connected to a controller 52. The controller 52 is electrically connected to the rear wheel 33 and the front wheel. The operating handle 50 controls the wheelchair's direction of travel, as well as its raising or folding.

[0075] Furthermore, such as Figures 3 to 4 As shown, the seat assembly 10 includes a backrest 11, a seat cushion 12, and a seat connecting part 13. The backrest 11 is connected to the rear end of the seat cushion 12, and the seat connecting part 13 is connected to the end of the seat cushion 12 facing the first connecting seat 34. The first connecting seat 34 and the seat connecting part 13 are slidably installed in the front-back direction to realize the assembly of the first connecting seat 34 and the seat connecting part 13. The operation is simple and convenient, and the operation efficiency is improved.

[0076] In one embodiment, the rear end of the first connecting seat 34 is inclined downwards to the rear end of the seat connecting part 13. The rear end of the first connecting seat 34 and the rear end of the seat connecting part 13 extend downwards, so that the first connecting seat 34 and the seat connecting part 13 are inclined as a whole. When the user sits on the seat cushion 12 and the first connecting seat 34 slides forward relative to the seat connecting part 13, the seat connecting part 13 generates a downward and backward resistance to the first connecting seat 34, so as to prevent the seat connecting part 13 from quickly disengaging from the first connecting seat 34, keeping the seat connecting part 13 and the first connecting seat 34 in the installed connection state, thereby improving the safety of use.

[0077] As one embodiment, such as Figure 3 As shown, the bottom surface of the seat cushion 12 is provided with an installation slope 121. The rear end of the installation slope 121 is inclined downward. The seat connecting part 13 is connected to the installation slope 121. The installation slope 121 makes the seat connecting part 13 inclined. The installation slope 121 is set on the seat to improve the ease of processing.

[0078] In one embodiment, the backrest 11 is rotatably connected to the rear end of the seat cushion 12. When stored, the backrest 11 folds towards the seat cushion 12, reducing the storage space of the seat assembly 10.

[0079] Furthermore, such as Figures 7 to 10 As shown, the first connecting seat 34 is provided with a forward-opening insertion groove 341, the seat connecting part 13 is provided with an insertion block 131 corresponding to the position of the insertion groove 341, the insertion block 131 is slidably installed in the insertion groove 341, the front end of the seat connecting part 13 is provided with a downward-extending seat limiting part 132, the seat limiting part 132 is connected to the front end of the insertion block 131, the front end of the first connecting seat 34 is provided with a locking part 343, the seat limiting part 132 is located at the front end of the insertion groove 341 and is detachably connected to the locking part 343. The first connecting seat 34 and the seat connecting part 13 are installed in the insertion slot 341 via a plug-in block 131 to achieve relative sliding installation. The seat limiting part 132 is connected to the front end of the plug-in block 131 and extends downward to limit the relative sliding position of the plug-in block 131 and the insertion slot 341. The seat limiting part 132 is installed at the front end of the insertion slot 341. After the seat limiting part 132 is connected to the locking part 343, the plug-in block 131 is kept in the insertion slot 341 to prevent the plug-in block 131 from sliding out and to ensure safety. When it is necessary to remove the seat cushion 12 from the first connecting seat 34, the connection between the seat limiting part 132 and the locking part 343 is released to separate the seat limiting part 132 and the locking part 343. The plug-in block 131 is then slid forward out of the insertion slot 341 to achieve disassembly. The operation is simple and convenient.

[0080] In one embodiment, the locking part 343 is a buckle. The locking part 343 is rotatably mounted on the first connecting seat 34 in the width direction. The snap-fit ​​end of the buckle extends upward and the front end of the snap-fit ​​end is provided with a guide slope. When the seat limiting part 132 is installed from front to back, the lower end of the seat limiting part 132 pushes the buckle along the guide slope, causing the snap-fit ​​end to rotate downward. When the seat limiting part 132 moves to the rear side of the snap-fit ​​end, the snap-fit ​​end springs back upward, and the seat limiting part 132 snaps into the inner side of the snap-fit ​​end. The operation is simple and the assembly efficiency is high.

[0081] When the seat limiting part 132 engages with the buckle, the buckle is reset by a spring. After a period of use, the spring elasticity loosens, and the seat connecting part 13 and the first connecting seat 34 can still slide relative to each other in the front-back direction after locking, causing abnormal noise. To avoid abnormal noise, further measures are taken, such as... Figures 8 to 9As shown, the seat limiting part 132 is provided with a downward-facing locking slot 1321. The locking part 343 includes a positioning rod 3431 and an eccentric locking rod 3432. The first end of the positioning rod 3431 is rotatably connected to the first connecting seat 34, and the second end of the positioning rod 3431 extends out of the front end of the first connecting seat 34. The eccentric locking rod 3432 is rotatably connected to the second end of the positioning rod 3431. The positioning rod 3431 is installed in the locking slot 1321. The peripheral side of the eccentric locking rod 3432 is provided with a locking surface 3433. When the locking surface 3433 is in contact with the seat limiting part 132, the seat limiting part 132 is limited between the locking surface 3433 and the first connecting seat 34. The pivot of the positioning rod 3431 extends along the width direction. The second end of the positioning rod 3431 rotates forward and is installed in the locking slot 1321, limiting the seat limiting part 132 in the width direction. The eccentric locking rod 3432 is rotatably installed on the second end of the positioning rod 3431, and the seat connecting part 13 is locked and disassembled through the eccentric locking rod 3432. Specifically, the pivot of the eccentric rod extends along the width direction, and the peripheral side of the eccentric locking rod 3432 is provided with a locking surface 3433. The eccentric rotation of the eccentric locking rod 3432 causes the locking surface 3433 to come into contact with the seat limiting part 132. The seat limiting part 132 is limited between the locking surface 3433 and the first connecting seat 34, preventing the insertion block 131 from sliding relative to the insertion slot 341, and realizing the position locking of the seat connecting part 13 and the first connecting seat 34. Because the eccentric locking rod 3432 is eccentrically mounted to its shaft, the pressing force on the seat limiting part 132 towards the rear is large, improving the locking effect between the seat connecting part 13 and the first connecting seat 34 in the front-rear direction and preventing the first connecting seat 34 and the seat connecting part 13 from sliding relative to each other in the front-rear direction, thus avoiding impact noise. Rotating the eccentric locking rod 3432 separates the locking surface 3433 from the seat limiting part 132, the second end of the positioning rod 3431 rotates downward and disengages from the locking slot 1321, and the insertion block 131 slides forward and disengages from the insertion groove 341, thereby realizing the disassembly of the seat connecting part 13 and the first connecting seat 34.

[0082] Furthermore, such as Figure 11-15As shown, the bottom of the first connecting seat 34 is provided with a locking extension arm 344 that is located below the insertion slot 341 and extends forward. The locking part 343 includes an operating push rod 3434 and a locking rod 3435. The upper end of the operating push rod 3434 is rotatably connected to the locking extension arm 344, and the locking rod 3435 extends along the width direction and is connected to the operating push rod 3434. The seat limiting part 132 is located between the front end of the insertion slot 341 and the locking rod 3435. When the operating push rod 3434 rotates backward, the outer peripheral surface of the locking rod 3435 abuts against the front end of the seat limiting part 132 and locks it. The locking extension arm 344 is located below the insertion slot 341 and extends forward, providing rotational operating space for the locking part 343. Specifically, the locking part 343 includes an operating push rod 3434 and a locking rod 3435. The operating push rod 3434 is used to lock and unlock the first connecting seat 34 and the seat connecting part 13. The insertion block is slidably inserted into the insertion slot 341 from the front end of the insertion slot 341 to connect the first connecting seat 34 and the seat connecting part 13. The seat limiting part 132 is located between the locking rod 3435 and the insertion slot 341 in the front-rear direction. The operating push rod 3434 is rotatably connected to the locking extension arm 344. The locking rod 3435 extends in the width direction, such as... Figure 12 As shown, rotating the operating push rod 3434 backward causes the locking rod 3435 to rotate upward. The locking rod 3435 applies a backward force to the seat limiting part 132, and the outer peripheral wall of the locking rod 3435 abuts against the seat limiting part 132, thereby locking the first connecting seat 34 and the seat connecting part 13. Figure 15 As shown, rotating the operating push rod 3434 forward causes the locking rod 3435 to rotate downward, separating the locking rod 3435 from the seat limiting part 132, thereby unlocking the first connecting seat 34 from the seat connecting part 13. Compared to the positioning rod 3435, which needs to be installed in the locking slot 1321 and requires positioning, the locking rod 3435 does not need to be positioned with the seat limiting part 132, making the operation more convenient and efficient.

[0083] Furthermore, such as Figure 12-13 As shown, when the operating push rod 3434 extends downward, the locking rod 3435 is located below the locking extension arm 344, and a locking clearance channel 3436 is formed above the locking rod 3435. The seat limiting part 132 is installed in the insertion slot 341 through the locking clearance channel 3436 to avoid interference between the seat limiting part 132 and the locking rod 3435, and to ensure the smooth installation of the insertion block 131 and the insertion slot 341.

[0084] Furthermore, such as Figure 14-15As shown, the seat connecting part 13 is provided with a seat unlocking part 133 located at the front end of the seat locking part 343. The upper end of the seat unlocking part 133 is connected to the front end of the plug block 131, and the lower end of the seat unlocking part 133 extends downward to form an unlocking end 1331. The locking part 343 is located between the seat locking part 343 and the seat unlocking part 133 in the front-rear direction. When the operating push rod 3434 is rotated forward, the operating push rod 3434 pushes the unlocking end 1331 forward. The seat unlocking part 133 makes it easier to unlock the first connecting seat 34 from the seat connecting part 13. Specifically, when the operating push rod 3434 rotates forward, the locking rod 3435 rotates downward and separates from the seat limiting part 132, but the plug block 131 is still installed in the plug groove 341. The operating push rod 3434 rotates further forward and applies a forward pushing force to the unlocking end 1331, applying an initial force to the plug block 131 to move forward away from the plug groove 341. The plug block 131 slides forward more smoothly away from the plug groove 341, realizing the disassembly of the first connecting seat 34 and the seat connecting part 13, reducing the difficulty of disassembly operation and improving operation efficiency.

[0085] As one embodiment, such as Figure 14-15 As shown, the seat unlocking part 133 includes a first unlocking part 1332 extending in the front-rear direction and a second unlocking part 1333 extending in the vertical direction. The rear end of the first unlocking part 1332 is connected to the front end of the plug-in block 131, and the front end of the first unlocking part 1332 is connected to the upper end of the second unlocking part 1333. The lower end of the second unlocking part 1333 is the unlocking end 1331. The second unlocking part 1333 is located in front of the operating push rod 3434. When the operating push rod 3434 extends in the vertical direction, the unlocking end 1331 is located between the upper and lower ends of the operating push rod 3434 in the height direction, so that the operating push rod 3434 pushes the unlocking end 1331 forward.

[0086] As one embodiment, such as Figure 14 As shown, the lower end of the seat limiting part 132 is provided with a locking guide slope 1322. The lower end of the locking guide slope 1322 extends backward relative to the upper end, making it easier for the outer peripheral surface of the locking rod 3435 to move upward along the locking guide slope 1322 and abut against the seat limiting part 132, making the locking operation smoother.

[0087] In the technical solution of sliding fit between the insertion slot 341 and the insertion block 131, such as Figures 7 to 10As shown, the width of the front end of the insertion slot 341 is equal to the width of the rear end. The shape of the insertion block 131 corresponds to the shape of the insertion slot 341. During assembly, the width of the insertion slot 341 is greater than the width of the insertion block 131, and the height of the insertion slot 341 is greater than the height of the insertion block 131, providing an assembly gap for the insertion block 131 to meet the requirements of smooth assembly. However, for this reason, the insertion slot 341 and the insertion block 131 can wobble relative to each other in the width and height directions, respectively, producing abnormal noise. Furthermore, the insertion slot 341 includes two oppositely arranged slot sidewalls 3411 and a slot bottom surface 3412. The slot bottom surface 3412 is connected to the lower end of the slot sidewalls 3411 on both sides in the width direction. The rear end width of the slot bottom surface 3412 is smaller than the front end width of the slot bottom surface 3412. The shape of the insertion block 131 matches the shape of the insertion slot 341. The rear end of the plug-in block 131 is inserted from the front end of the plug-in slot 341. Since the rear end width of the slot bottom surface 3412 is smaller than the front end width of the slot bottom surface 3412, the slot opening width of the plug-in slot 341 is larger than the rear end width of the plug-in block 131. This makes the overall width of the rear end of the plug-in slot 341 smaller than the overall width of the front end of the plug-in slot 341. During assembly, the plug-in block 131 can be easily inserted into the plug-in slot 341 from the slot opening, meeting the requirements for smooth assembly and improving assembly efficiency.

[0088] As one embodiment, such as Figures 7 to 10 As shown, the groove sidewall 3411 forms an angle α with the front and rear directions, where 3° ≤ angle α ≤ 10°. This provides a larger assembly space for the plug-in block 131 when it is assembled in the groove of the plug-in groove 341, which facilitates the assembly operation and improves the assembly efficiency.

[0089] As one embodiment, such as Figures 9 to 10 As shown, the plug-in block 131 has guide slopes 1313 on both sides of the rear end in the width direction. The rear end of the guide slopes 1313 extends inward towards the plug-in block 131, so that when the plug-in block 131 is assembled with the plug-in groove 341, the rear end of the plug-in block 131 is guided by the guide slopes 1313 to be inserted into the groove of the plug-in groove 341, thereby improving the accuracy of the assembly operation and improving the assembly efficiency.

[0090] Furthermore, such as Figures 7 to 10 As shown, the sidewall 3411 of the slot is provided with a first limiting inclined surface 342, and the opposite sides of the plug-in block 131 are respectively provided with second limiting inclined surfaces 1311. The first limiting inclined surface 342 and the second limiting inclined surface 1311 are fitted together. Through the fitted cooperation of the first limiting inclined surface 342 and the second limiting inclined surface 1311, the plug-in block 131 and the sidewall of the plug-in slot 341 are limited in the height and width directions, eliminating the gap between the first limiting inclined surface 342 and the second limiting inclined surface 1311, eliminating the abnormal noise caused by the relative sliding of the plug-in block 131 and the plug-in slot 341, and further improving the user experience.

[0091] As one embodiment, such as Figures 7 to 10 As shown, the upper end of the first limiting inclined surface 342 extends inclinedly towards the inside of the insertion groove 341, and the upper end of the second limiting inclined surface 1311 extends inclinedly towards the inside of the insertion block 131.

[0092] Furthermore, such as Figures 3 to 5 As shown, the insertion slot 341 includes a slot end face 3413, with a first terminal 3414 on the slot end face 3413. The insertion block 131 has a second terminal 1312 facing the slot end face 3413. The first terminal 3414 and the second terminal 1312 are connected by insertion. When the insertion block 131 is installed in the insertion slot 341, the assembly of the seat assembly 10 and the rear wheel folding assembly 30 is completed, and the electrical connection assembly of the seat assembly 10 and the rear wheel folding assembly 30 is also completed, further reducing the difficulty of assembling and disassembling the wheelchair and improving the assembly efficiency of the wheelchair.

[0093] In one embodiment, the groove end face 3413 is connected to the groove side wall 3411 at both ends in the width direction. The plug block 131 is inserted into the plug groove 341 facing the groove end face 3413. The second terminal 1312 in the plug block 131 is plugged into the first terminal 3414 of the groove end face 3413 to achieve electrical connection. The operation is convenient and the assembly efficiency is high.

[0094] Furthermore, such as Figures 1 to 5 As shown, the rear wheel folding assembly 30 includes a power supply 51 and a controller 52, which are electrically connected to a first terminal 3414. The seat assembly 10 includes an operating handle 50, which is electrically connected to a second terminal 1312. The second terminal 1312, electrically connected to the first terminal 3414, transmits the operating signal of the operating handle 50 to the controller 52 and provides power 51 to the operating handle 50.

[0095] In one embodiment, the seat assembly 10 is equipped with a marker light, which is electrically connected to the operating handle 50 and the second terminal 1312, respectively, and the switch of the marker light is controlled by the operating handle 50.

[0096] As one embodiment, such as Figures 1 to 5 As shown, the controller 52 is installed on the main beam frame 35. The wires connecting the rear wheel 33 to the controller 52 are arranged along the hollow structure within the frame of the connecting beam frame 36 and the main beam frame 35. The wires connecting the controller 52 to the first terminal 3414 are arranged along the hollow structure within the frame of the main beam frame 35. This allows the connecting wires of the electric wheelchair to be housed within the connecting beam frame 36 and the main beam frame 35, avoiding the risk of damage from exposed wires and improving safety. It also prevents the wires from getting tangled or interfering with other components during use, folding, or assembly, thus improving the smoothness of the folding and assembly process.

[0097] Furthermore, such as Figures 16 to 17 as well as Figure 6 As shown, the lower end of the main beam frame 35 is provided with a first connecting rod 351 and a latch 352. The front wheel 20 includes a second connecting rod 21 and a connecting arm 22 extending toward the first connecting rod 351. The connecting arm 22 is provided with a first connecting part 23, which is detachably connected to the first connecting rod 351. The latch 352 is also detachably connected to the first connecting rod 351. The detachable connection between the first connecting part 23 and the first connecting rod 351 achieves the initial positioning of the connection between the main beam frame 35 and the front wheel 20. The latch 352 and the second connecting rod 21 lock the front wheel 20. When it is necessary to remove the front wheel 20, the latch 352 is opened, allowing the second connecting rod 21 to disengage from the latch 352, and the first connecting part 23 is separated from the first connecting rod 351, thus removing the front wheel 20 from the main beam frame 35. The disassembly and assembly operations are simple, efficient, and easy to perform.

[0098] Furthermore, such as Figure 17 As shown, the lower end of the main beam frame 35 has a downward-opening assembly cavity 353, where the first connecting rod 351 and the latch 352 are connected. The downward-opening assembly cavity 353 facilitates the connection of the first connecting part 23 and the second connecting rod 21 from bottom to top with the first connecting rod 351 and the latch 352, respectively. Simultaneously, since the user's activity space is primarily located above the assembly cavity 353, this effectively prevents accidental triggering of the latch 352 during use, which could lead to the front wheel 20 separating from the main beam frame 35 and causing a safety hazard, thus improving user safety.

[0099] In one embodiment, the first connecting part 23 has a hole structure. The lower end of the main beam frame 35 is provided with a connecting hole. The first connecting rod 351 passes through the connecting hole and the first connecting part 23 in sequence to achieve a preliminary connection between the main beam frame 35 and the front wheel 20. The second connecting part is locked by a latch 352. The latch 352 is an elastic return hook structure, which is an existing structure and will not be described in detail here. However, since the first connecting part 23 is easily lost after disassembly, further improvements are needed.

[0100] Furthermore, such as Figures 16 to 17 as well as Figure 6As shown, the first connecting rod 351 is connected to the rear end of the assembly cavity 353, and the latch 352 is rotatably connected to the front end of the assembly cavity 353 around the width direction. The latch 352 is a hook structure. The lower end of the main beam frame 35 is provided with a downward-opening limiting groove 354. The second connecting rod 21 is installed in the limiting groove 354. When the latch 352 locks the second connecting rod 21, one of the groove sidewalls 3411 of the limiting groove 354 and the latch 352 are positioned correspondingly in the front-rear direction when locked. The second connecting rod 21 is located between the bottom surface 3412 of the limiting groove 354 and the latch 352 in the height direction. The first connecting part 23 is a groove structure with the opening facing the rear end. The first connecting rod 351 is fixed to the lower end of the main beam frame 35. When the main beam frame 35 is assembled with the front wheel 20, the first connecting rod 351 is installed into the groove through the opening of the first connecting part 23 to achieve initial positioning. Since the opening of the first connecting part 23 faces the rear end, it prevents the front wheel 20 from moving further backward, thus limiting the front wheel 20. After the second connecting rod 21 is installed and locked by the latch 352, since one of the groove sidewalls 3411 of the limiting groove 354 and the latch 352 are correspondingly set in the front-rear direction when locked, the groove sidewall 3411 limits the second connecting rod 21 from moving further forward, preventing the second connecting rod 21 from accidentally moving forward and opening the latch 352, thus improving the safety of use. The second connecting rod 21 is located in the height direction between the bottom surface 3412 of the limiting groove 354 and the latch 352. The bottom surface 3412 of the limiting groove 354 and the latch 352 limit the installation position and installation space of the second connecting rod 21 in the height direction, preventing the second connecting rod 21 from having too much room to move in the height direction, which could lead to collisions with other components, deformation, or abnormal noise. Since the first connecting rod 351 is fixed to the bottom of the main beam frame 35, and the first connecting part 23 is a groove structure directly installed on the first connecting rod 351, the first connecting rod 351 does not need to be disassembled, reducing the number of parts after disassembly and avoiding the loss of parts after disassembly.

[0101] As one embodiment, such as Figure 17 As shown, the latch 352 includes a hook body, an operating part, and a resilient reset part. One end of the operating part is connected to the upper end of the hook body, and the other end extends forward. The resilient reset part is connected to both the hook body and the lower end of the main beam frame 35. The hook body opening faces rearward and rotates about its width. When it is necessary to disassemble the front wheel 20 from the main beam frame 35, the operating part is pushed upward, causing the hook body to rotate counterclockwise. This compresses the resilient reset part, separating the hook body from the second connecting rod 21, releasing the push on the operating part. The resilient reset part then springs back, causing the hook body to return to the locked position. The operating part is located within the assembly cavity 353 to prevent accidental operation and improve safety. The resilient reset part is preferably a spring.

[0102] In one embodiment, the opening of the latch 352 is positioned facing the rear end so that the operating part faces forward, making disassembly easier.

[0103] As one embodiment, such as Figure 6 As shown, the front wheel 20 includes a pedal and a front wheel 20 body. The front wheel 20 body is connected to the opposite sides of the pedal. At least two connecting arms 22 extending backward are connected to the rear end of the pedal. The latch 352 is located between two adjacent connecting arms 22. The two ends of the second connecting rod 21 are connected to the connecting arms 22 and extend to both sides and are installed in the limiting groove 354. The limiting groove 354 communicates with the assembly cavity 353.

[0104] As one embodiment, such as Figure 6 As shown, the front wheel 20 includes a baffle, which is connected to the front end of the connecting arm 22 and located below the corresponding latch 352. Since the assembly cavity 353 opens downwards, the baffle can prevent ground obstacles from pushing open the latch 352 during the electric wheelchair's operation, thus preventing the main beam frame 35 from separating from the front wheel 20 and improving safety.

[0105] As one embodiment, the pedal, connecting arm 22, second connecting rod 21, and baffle are integrally formed, resulting in high processing efficiency.

[0106] Furthermore, such as Figures 18 to 23 As shown, the seat assembly 10 includes a bottom support 14, a first rod 15, a second rod 16, and an armrest 17. The backrest 11 is detachably connected to the bottom support 14. One end of the bottom support 14 is connected to the seat cushion 12, and the other end of the bottom support 14 is provided with a first rotating part 141 and a second rotating part 142. One end of the first rod 15 is rotatably connected to the first rotating part 141 to form a first axis 1. The other end of the first rod 15 is rotatably connected to one end of the second rod 16 to form a second axis 2. The other end of the second rod 16 is rotatably connected to the armrest 17 and the backrest 11 to form a third axis 3. The backrest 11 is rotatably connected to the second rotating part 142 to form a fourth axis 4.

[0107] The first axis 1, the second axis 2, the third axis 3, and the fourth axis 4 extend along the width direction and are arranged in parallel. The first axis 1, the second axis 2, the third axis 3, and the fourth axis 4 are projected onto the projection surface along the width direction to form the first projection point, the second projection point, the third projection point, and the fourth projection point. The first projection point, the second projection point, the third projection point, and the fourth projection point are connected sequentially on the projection surface to form a quadrilateral. The backrest 11 is detachably connected to the bottom support 14. The backrest 11 rotates forward around its width to fold with the seat cushion 12. One end of the bottom support 14 is fixed to the seat cushion 12, and the other end of the bottom support 14 is provided with a first rotating part 141 and a second rotating part 142. The first rotating part 141 is connected to one end of a first rod 15, and the other end of the first rod 15 is rotatably connected to one end of a second rod 16. One end of the second rod 16 and one end of the armrest 17 are rotatably connected to the backrest 11. The backrest 11 is rotatably connected to the second rotating part 142 to form a parallel four-bar linkage. During the folding process, the line connecting the first projection point, the second projection point, the third projection point, and the fourth projection point on the projection plane always remains a quadrilateral. The second rod 16 drives the armrest 17 to rotate synchronously relative to the backrest 11, so that the armrest 17 maintains or basically maintains the initial installation angle, avoiding the armrest 17 extending downward to the bottom of the seat cushion 12 after folding, which would cause additional collisions or interference and improve the safety of use.

[0108] In one embodiment, the first axis 1, the second axis 2, the third axis 3, and the fourth axis 4 extend along the width direction and are arranged in parallel. The first axis 1, the second axis 2, the third axis 3, and the fourth axis 4 are projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point, and a fourth projection point. The first projection point, the second projection point, the third projection point, and the fourth projection point are connected sequentially on the projection surface to form a parallelogram, making the folding and switching of the armrest in use more stable.

[0109] As one embodiment, the handrail 17 always remains in a horizontal or basically horizontal state.

[0110] As one embodiment, such as Figure 18 As shown, the operating handle 50 is installed at the end of the handrail 17 away from the second rod 16 in the front-back direction.

[0111] Furthermore, such as Figures 18 to 26As shown, at least one side of the chair back 11 is provided with a chair back connecting portion 111. The chair back connecting portion 111 includes a connecting post 1111 and a first limiting block 1112. The first limiting block 1112 is located on the outer periphery of the connecting post 1111 and has a first mating surface 11121. One end of the second rod 16 is provided with a second limiting block 161 and a rod ring 162. The second limiting block 161 is located on the edge of the rod ring 162 and has a first mating surface 1611. One end of the armrest 17 is provided with an armrest ring 171 and a third limiting block 172. The third limiting block 172 has a first mating surface 1721 and a second mating surface 1722. A rotation notch 173 is formed circumferentially between the second mating surface 1722 of the armrest and the first limiting block 1112 and the second limiting block 161 are located in the rotation notch 173. The connecting column 1111, the rod ring 162 and the armrest ring 171 are coaxially rotatably connected. The second limiting block 161 is located radially between the armrest ring 171 and the first limiting block 1112. The armrest 17 includes a used state and a folded state. When the armrest 17 is in the used state, the first mating surface 11121 of the chair back is in contact with the first mating surface 1721 of the armrest. When the armrest 17 is in the folded state, the first mating surface 1611 of the rod is in contact with the first mating surface 1721 of the armrest, and the first mating surface 11121 of the chair back is separated from the first mating surface 1721 of the armrest. The rod ring 162 and armrest ring 171 are respectively sleeved on the connecting post 1111. The rod ring 162 and armrest ring 171 can rotate coaxially relative to the connecting post 1111, thus fixing the rod ring 162 and armrest ring 171. The second limiting block 161 is radially located between the armrest ring 171 and the first limiting block 1112, so that the first mating surface 1721 of the armrest can be in contact with the first mating surface 11121 of the chair back or with the first mating surface 1611 of the rod, thereby realizing the conversion between different states of the armrest 17. When the armrest 17 is in use, the first mating surface 1721 of the armrest is in contact with the first mating surface 11121 of the chair back. The first mating surface 11121 of the chair back of the first limiting block 1112 limits the first mating surface 1721 of the armrest, preventing the armrest 17 from rotating further clockwise, so that the armrest 17 remains in a horizontal or basically horizontal state, providing support for the user. When the handrail 17 changes from the use state to the folded state, the first rod 15 drives the second rod 16 to rotate counterclockwise, the rod ring 162 rotates relative to the connecting post 1111, the first mating surface 1611 of the rod comes into contact with the first mating surface 1721 of the handrail and drives the handrail ring 171 to rotate relative to the connecting post 1111, and the second rod 16 drives the handrail 17 to rotate synchronously, so that the angle of the handrail 17 remains unchanged or basically unchanged in both the use state and the folded state.

[0112] Furthermore, such as Figures 27 to 28As shown, the first limiting block 1112 has a second limiting surface 11122 for the backrest, and the armrest 17 includes a yielding state. When the armrest 17 is in the yielding state, the second mating surface 1722 of the armrest is in contact with the second limiting surface 11122 of the backrest, forming a side access channel 18 between the armrest 17 and the side of the seat cushion 12. When the armrest 17 is manually lifted and rotated counterclockwise, the second limiting surface 11122 of the backrest and the second mating surface 1722 of the armrest are in contact. The second limiting surface 11122 of the backrest prevents the armrest 17 from rotating further counterclockwise, and the armrest 17 is in a vertical or basically vertical state. The armrest 17 is rotated upward counterclockwise to release the interference with the side of the seat cushion 12, so that the side access channel 18 is formed between the armrest 17 and the side of the seat cushion 12. The user can enter and exit the seat from the side access channel 18 or from the front of the seat, providing the user with more options for entering and exiting the seat.

[0113] As one embodiment, such as Figure 19 As shown, the first mating surface 11121 of the chair back, the second mating surface of the chair back 11, the first mating surface 1611 of the rod, the second mating surface 1612 of the rod, the first mating surface 1721 of the armrest, and the second mating surface 1722 of the armrest extend radially to improve the fit between the first mating surface 11121 of the chair back, the first mating surface 1611 of the rod, and the first mating surface 1721 of the armrest, and to improve the fit between the second mating surface 1722 of the chair back 11 and the second mating surface 1722 of the armrest.

[0114] Furthermore, such as Figure 19 As shown, when the handrail 17 is in use, there is a gap 163 between the first mating surface 1611 of the rod and the first mating surface 1721 of the handrail. This gap 163 prevents the transmission of force between the first mating surface 1611 of the rod and the first mating surface 1721 of the handrail during use. Consequently, the second rod 16 is not under stress during use, reducing the duration of stress on the second rod 16, preventing deformation or breakage due to prolonged stress, and extending the service life of the second rod 16.

[0115] As one embodiment, such as Figure 28 As shown, when the handrail 17 is in the yielding state, there is a gap 163 between the second mating surface 1612 of the rod and the second mating surface 1722 of the handrail. The gap 163 prevents the force transmission between the second mating surface 1612 of the rod and the second mating surface 1722 of the handrail in the yielding state. As a result, the second rod 16 is in a stress-free state in the yielding state, reducing the stress duration of the second rod 16, preventing the second rod 16 from deforming or breaking due to prolonged stress, and extending the service life of the second rod 16.

[0116] As one embodiment, such as Figure 13As shown, the chair back 11 includes a chair back support 112 and a back cushion 113. The back cushion 113 is connected to the front end of the chair back support 112. The chair back connecting part 111 is provided on opposite sides of the chair back support 112 in the width direction. The lower end of the chair back support 112 is provided with a second mating part and a buckle. The second mating part is rotatably connected to the second rotating part 142 so that the chair back support 112 rotates relative to the bottom support 14. The buckle is engaged with the bottom support 14 to realize the locking or folding of the chair back support 112.

[0117] Furthermore, such as Figure 5 and Figure 27 As shown, the main beam frame 35 includes a main side rod 355, an upper connecting rod 356, and a lower connecting rod 357. The upper connecting rod 356 and the lower connecting rod 357 extend along the width direction. The two ends of the upper connecting rod 356 and the two ends of the lower connecting rod 357 are connected to the main side rod 355 to form a frame structure. The two ends of the front connecting rod 31 are rotatably connected to the lower connecting rod 357 and the front end of the first connecting seat 34, respectively. The two ends of the rear drive push rod 32 are rotatably connected to the upper connecting rod 356 and the connecting beam frame 36, respectively. The upper connecting rod 356, the main side rod 355, and the lower connecting rod 357 are connected in sequence to form a frame structure, improving the support strength of the seat in the height direction. The lower end of the front connecting rod 31 is rotatably connected to the lower connecting rod 357, and the upper end of the front connecting rod 31 is rotatably connected to the front end of the first connecting seat 34. The upper end of the rear drive push rod 32 is rotatably connected to the upper connecting rod 356, and the lower end of the rear drive push rod 32 is rotatably connected to the connecting beam frame 36. Based on the frame structure in the height direction, the rear drive push rod 32 is rotatably connected to the upper connecting rod 356, forming a T-shaped support structure in the width direction. The front connecting rod 31 is rotatably connected to the lower connecting rod 357, forming an inverted T-shaped support structure in the width direction. The T-shaped support structure and the inverted T-shaped support structure improve the seat's support stability in the width direction. When the electric seat is going uphill or downhill, the length of the inverted T-shaped structure remains unchanged, and only the length of the T-shaped structure is adjusted. The angle adjustment strategy is simpler and helps to improve the stability of the seat angle adjustment.

[0118] As one embodiment, the total length of the front connecting rod 31 is set to a fixed value, resulting in a simpler overall structure and lower production costs.

[0119] In one embodiment, the front connecting rod 31 is a telescopic push rod. The distance between the two ends of the front connecting rod 31 connected to the first connecting seat 34 and the lower connecting rod 357 is adjustable, meaning the total length of the front connecting rod 31 can be adjusted according to actual needs. The front drive push rod 31 and the rear drive push rod 32 extend simultaneously to position the user at a height higher than when seated, facilitating access to items at higher levels and meeting more user needs. The front connecting rod 31 and the rear drive push rod 32 shorten simultaneously, allowing the rear wheel folding assembly 30 to fold as a whole. The seat assembly 10 and the front wheel 20 are respectively connected to the rear wheel folding assembly 30 to form a folded unit, facilitating storage and transportation, preventing component loss, and eliminating the need for reassembly for reuse, making it convenient to use.

[0120] In one embodiment, the controller 52 is electrically connected to the angle sensor, the front connecting rod 31, and the rear drive push rod 32. When the user needs to raise the seat cushion 12 above the sitting height, the controller 52 controls the front connecting rod 31 and the rear drive push rod 32 to extend simultaneously. At the same time, it controls the length changes of the front connecting rod 31 and the rear drive push rod 32 according to the angle change information of the angle sensor, so that the seat cushion 12 always remains in a horizontal or basically horizontal state to ensure the user's safety.

[0121] As one embodiment, such as Figure 5 As shown, the front connecting rod 31 is connected to the middle of the lower connecting rod 357 in the width direction, and the rear drive push rod 32 is connected to the middle of the upper connecting rod 356 in the width direction, resulting in better stability of seat angle adjustment.

[0122] Furthermore, such as Figure 27 and Figure 30As shown, the connecting beam frame 36 includes a bottom connecting rod 361, a middle support connecting rod 362, and a rear connecting plate 363. The bottom connecting rod 361 extends in the front-rear direction. The middle support connecting rod 362 and the rear connecting plate 363 are respectively connected to the bottom connecting rod 361 on both sides in the width direction. The front end of the bottom connecting rod 361 is rotatably connected to the lower end of the main beam frame 35, and the lower end of the rear drive push rod 32 is rotatably connected to the middle support connecting rod 362. The bottom connecting rod 361, the middle support connecting rod 362, and the rear connecting plate 363 are connected to form a bottom frame structure. The middle support connecting rod 362 is located in front of the rear connecting plate 363, so that the rear drive push rod 32 and the middle support connecting rod 362 form a rearward tilting T-shaped support structure. Under the premise of the same model of rear drive push rod 32, the range of motion of the main beam frame 35 in the front-rear direction and the height direction can be increased, that is, the angle compensation range and lifting height of the seat can be increased, which can meet the driving needs of passing through larger slopes and increase the lifting range of the seat height. Meanwhile, since the rear wheel 33 generates a force in the height direction when crossing obstacles, the connection between the rear wheel 33 and the rear connecting plate 363 can reduce the influence of the force in the height direction on the T-shaped support structure formed by the rear drive push rod 32 and the middle support link 362, thereby improving the support stability of the T-shaped support structure.

[0123] Furthermore, such as Figure 20 As shown, the bottom connecting rod 361 includes a first segment 3611 and a second segment 3612. The front end of the first segment 3611 extends upward at an incline and is rotatably connected to the lower end of the main beam frame 35. The rear end of the first segment 3611 is connected to the front end of the second segment 3612, and the rear end of the second segment 3612 is fixedly connected to the rear connecting plate 363. The front connecting rod 31 is connected to the lower end of the main beam frame 35, and the lower end of the main beam frame 35 is connected to the front wheel 20, making it easy for the lower end of the main beam frame 35 to concentrate force. The front end of the first segment 3611 extends upward at an incline and is rotatably connected to the lower end of the main beam frame 35, so that a portion of the force of the main beam frame 35 is transmitted along the first segment 3611 to the second segment 3612 to achieve force dispersion and avoid the lower end of the main beam frame 35 from concentrating force and breaking. In one embodiment, the first rod segment 3611 and the second rod segment 3612 form an angle b, which is set between 138° and 144°. The first rod segment 3611 and the main side rod 355 form an angle c, which is set between 50° and 107°.

[0124] As one embodiment, such as Figure 30 As shown, the bottom connecting rod 361 is provided with a connection point for connecting with the middle support connecting rod 362. The connection point is located at 1 / 5 to 1 / 3 of the length of the bottom connecting rod 361 in the front-rear direction, which shortens the distance between the middle support connecting rod 362 and the main beam frame 35 in the front-rear direction, increases the concentration of the bottom support force of the electric wheelchair, and improves the bottom support stability of the electric wheelchair.

[0125] Furthermore, such as Figure 29 As shown, the rear connecting plate 363 has bottom connecting plates 364 on both sides in the width direction. The bottom connecting plates 364 are rotatably connected to the rear connecting plate 363 in the front-rear direction. The side of the bottom connecting plate 364 away from the rear connecting plate 363 is connected to the rear wheel 33. The bottom connecting plate 364 is rotatably connected to the rear connecting plate 363 in the front-rear direction, which increases the range of motion of the rear wheel 33 in the height direction. It is directly connected to the rear connecting plate 363 or the bottom connecting rod 361 relative to the rear wheel 33, which avoids the rear wheel 33 being subjected to the force in the height direction when crossing obstacles, thus preventing the rear connecting plate 363 or the bottom connecting rod 361 from easily deforming, and improving the reliability of the connecting beam frame 36.

[0126] As one embodiment, such as Figure 29 As shown, a wheel connecting bracket 365 is provided at the upper end of the rear connecting plate 363. The wheel connecting bracket 365 is connected to the bottom connecting plate 364 through a buffer 366 to buffer the force of the rear wheel 33 when crossing obstacles, further reducing the direct collision between the bottom connecting plate 364 and the rear connecting plate 363, avoiding easy deformation of the rear connecting plate 363 or the bottom connecting rod 361, improving the reliability of the connecting beam frame 36, and at the same time reducing the feeling of bumps and improving the user experience.

[0127] In summary, this invention provides an electric wheelchair, including a seat assembly 10, front wheels 20, a rear wheel folding assembly 30, and a drive unit 40. A user sits on the seat assembly 10, which carries the user. The rear wheel folding assembly 30 supports the seat assembly 10 and allows for angle and height adjustments. Specifically, the rear wheel folding assembly 30 includes a first connecting seat 34, a front connecting rod 31, a rear drive push rod 32, a main beam frame 35, a connecting beam frame 36, and a rear wheel 33. The upper ends of the front connecting rod 31 and the main beam frame 35 are rotatably connected to the first connecting seat 34 in the front-rear direction. The lower ends of the front connecting rod 31 and the front end of the connecting beam frame 36 are rotatably connected to the lower ends of the main beam frame 35. The two ends of the rear drive push rod 32 are rotatably connected to the upper ends of the main beam frame 35 and the connecting beam frame 36, respectively. When the wheelchair goes uphill, the rear drive push rod 32 extends; when it goes downhill, the rear drive push rod 32 shortens, compensating for the angle of the seat assembly 10 to adjust its center of gravity. This ensures that the seat assembly 10 remains parallel or nearly parallel to the ground during both uphill and downhill journeys, improving user comfort. The front connecting rod 31 and the rear drive push rod 32 extend simultaneously, placing the user at a higher height than when seated, facilitating access to items at higher levels and meeting more user needs. The front connecting rod 31 and the rear drive push rod 32 shorten simultaneously, allowing the rear wheel folding assembly 30 to fold as a whole. The seat assembly 10 and the front wheels 20 are connected to the rear wheel folding assembly 30 to form a folded unit, facilitating storage and transportation, preventing component loss, and eliminating the need for reassembly for reuse. The bottom of the seat assembly 10 is detachably connected to the first connecting seat 34, and the lower end of the main beam frame 35 is detachably connected to the front wheels 20. When the storage space is insufficient to accommodate the entire folded wheelchair, the seat assembly 10 can be disassembled from the first connecting seat 34, and the main beam frame 35 can be disassembled from the front wheel 20. The seat assembly 10, the front wheel 20, and the folded rear wheel assembly 30 form three main components. Each component occupies less space and is lighter, thus meeting the storage needs of small spaces and facilitating transportation. Furthermore, there are no restrictions on the order of assembly, disassembly, and folding of the seat assembly 10, the front wheel 20, and the rear wheel folding assembly 30. They can be disassembled before folding, or folded before disassembly, or the seat assembly 10 and the rear wheel folding assembly 30 can be assembled or disassembled first, and then the rear wheel folding assembly 30 and the front wheel 20 can be assembled or disassembled, or the rear wheel folding assembly 30 and the front wheel 20 can be assembled or disassembled first, and then the seat assembly 10 and the rear wheel folding assembly 30 can be assembled or disassembled. This reduces the operational limitations of wheelchair assembly and disassembly, and lowers the difficulty of wheelchair assembly and disassembly operations.

[0128] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An electric wheelchair, characterized in that: The device includes a seat assembly, a front wheel, a rear wheel folding assembly, and a drive unit. The rear wheel folding assembly includes a first connecting seat, a front connecting rod, a rear drive push rod, a main beam frame, a connecting beam frame, and a rear wheel. The upper end of the front connecting rod and the upper end of the main beam frame are rotatably connected to the first connecting seat in the front-rear direction. The lower end of the front connecting rod and the front end of the connecting beam frame are rotatably connected to the lower end of the main beam frame. The two ends of the rear drive push rod are rotatably connected to the upper end of the main beam frame and the connecting beam frame, respectively. The rear wheel is connected to the connecting beam frame. The seat assembly is detachably connected to the first connecting seat. The lower end of the main beam frame is detachably connected to the front wheel. The drive unit is electrically driven connected to at least the rear wheel. The seat assembly includes a backrest, a seat cushion, and a seat connecting part. The backrest is connected to the rear end of the seat cushion, and the seat connecting part is connected to the end of the seat cushion facing the first connecting seat. The first connecting seat and the seat connecting part are slidably installed in the front-back direction. The first connecting seat is provided with a forward-opening insertion slot, the seat connecting part is provided with an insertion block corresponding to the position of the insertion slot, the insertion block is slidably installed in the insertion slot, the front end of the seat connecting part is provided with a downward-extending seat limiting part, the seat limiting part is connected to the front end of the insertion block, the front end of the first connecting seat is provided with a locking part, the seat limiting part is located at the front end of the insertion slot and is detachably connected to the locking part; The seat limiting part is provided with a downward-facing locking slot. The locking part includes a positioning rod and an eccentric locking rod. The first end of the positioning rod is rotatably connected to the first connecting seat, and the second end of the positioning rod extends out of the front end of the first connecting seat. The eccentric locking rod is rotatably connected to the second end of the positioning rod. The positioning rod is installed in the locking slot. The peripheral side of the eccentric locking rod is provided with a locking surface. When the locking surface is in contact with the seat limiting part, the seat limiting part is limited between the locking surface and the first connecting seat.

2. The electric wheelchair according to claim 1, characterized in that: The bottom of the first connecting seat is provided with a locking extension arm located below the insertion slot and extending forward. The locking part includes an operating push rod and a locking rod. The upper end of the operating push rod is rotatably connected to the locking extension arm. The locking rod extends along the width direction and is connected to the operating push rod. The seat limiting part is located between the front end of the insertion slot and the locking rod. The operating push rod rotates backward, and the outer peripheral surface of the locking rod abuts against the front end of the seat limiting part for locking.

3. The electric wheelchair according to claim 2, characterized in that: When the operating push rod extends downward, a locking clearance channel is formed above the locking rod, and the seat limiting part is installed in the insertion slot through the locking clearance channel.

4. The electric wheelchair according to claim 2, characterized in that: The seat connecting part is provided with a seat unlocking part located at the front end of the seat locking part. The upper end of the seat unlocking part is connected to the front end of the plug block, and the lower end of the seat unlocking part extends downward to form an unlocking end. The locking part is located between the seat locking part and the seat unlocking part in the front-back direction. The operating push rod rotates forward and pushes the unlocking end forward.

5. The electric wheelchair according to claim 1, characterized in that: The insertion slot includes two oppositely arranged slot sidewalls and a slot bottom surface. The slot bottom surface is connected to the lower end of the slot sidewalls on both sides in the width direction. The rear width of the slot bottom surface is smaller than the front width of the slot bottom surface. The shape of the insertion block matches the shape of the insertion slot.

6. The electric wheelchair according to claim 5, characterized in that: The groove sidewall is provided with a first limiting inclined surface, and the two opposite sides of the plug block are respectively provided with a second limiting inclined surface, and the first limiting inclined surface and the second limiting inclined surface are in contact with each other.

7. The electric wheelchair according to claim 1, characterized in that: The plug slot includes a slot end face, the slot end face is provided with a first terminal, and the plug block is provided with a second terminal facing the slot end face. The first terminal and the second terminal are plugged into and electrically connected.

8. The electric wheelchair according to claim 7, characterized in that: The rear wheel folding assembly includes a power supply and a controller, which are electrically connected to the first terminal. The seat assembly includes an operating handle, which is electrically connected to the second terminal.

9. The electric wheelchair according to claim 1, characterized in that: The lower end of the main beam frame is provided with a first connecting rod and a buckle. The front wheel includes a second connecting rod and a connecting arm extending toward the first connecting rod. The connecting arm is provided with a first connecting part, which is detachably connected to the first connecting rod. The buckle is detachably connected to the first connecting rod.

10. The electric wheelchair according to claim 9, characterized in that: The lower end of the main beam frame is provided with an assembly cavity that opens downwards, and the first connecting rod is connected to the latch in the assembly cavity.

11. The electric wheelchair according to claim 10, characterized in that: The first connecting rod is connected to the rear end of the assembly cavity, and the latch is rotatably connected to the front end of the assembly cavity around the width direction. The latch is a hook structure. The lower end of the main beam frame is provided with a downward-opening limiting groove. The second connecting rod is installed in the limiting groove. When the latch locks the second connecting rod, one side wall of the limiting groove is correspondingly positioned with the latch in the front-rear direction when locked. The second connecting rod is located between the bottom surface of the limiting groove and the latch in the height direction. The first connecting part is a groove structure with the opening facing the rear end.

12. The electric wheelchair according to claim 1, characterized in that: The seat assembly includes a bottom support, a first rod, a second rod, and an armrest. The backrest is detachably connected to the bottom support. One end of the bottom support is connected to the seat cushion, and the other end of the bottom support is provided with a first rotating part and a second rotating part. One end of the first rod is rotatably connected to the first rotating part to form a first axis. The other end of the first rod is rotatably connected to one end of the second rod to form a second axis. The other end of the second rod is rotatably connected to the armrest and the backrest to form a third axis. The backrest is rotatably connected to the second rotating part to form a fourth axis. The first axis, the second axis, the third axis, and the fourth axis extend along the width direction and are arranged in parallel. The first axis, the second axis, the third axis, and the fourth axis are projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point, and a fourth projection point, respectively. The first projection point, the second projection point, the third projection point, and the fourth projection point are connected sequentially on the projection surface to form a quadrilateral.

13. The electric wheelchair according to claim 12, characterized in that: At least one side of the chair back is provided with a chair back connecting portion, the chair back connecting portion including a connecting post and a first limiting block, the first limiting block being located on the outer periphery of the connecting post, the first limiting block having a first mating surface for the chair back; one end of the second rod is provided with a second limiting block and a rod ring, the second limiting block being located on the edge of the rod ring, the second limiting block having a first mating surface for the rod; one end of the armrest is provided with an armrest ring and a third limiting block, the third limiting block having a first mating surface for the armrest and a second mating surface for the armrest, the first mating surface for the armrest and the second mating surface for the armrest being at... A rotation gap is formed between the circumference, and the first limiting block and the second limiting block are located in the rotation gap. The connecting column, the rod ring, and the armrest ring are coaxially rotatably connected. The second limiting block is located radially between the armrest ring and the first limiting block. The armrest includes a used state and a folded state. When the armrest is in the used state, the first mating surface of the chair back is in contact with the first mating surface of the armrest. When the armrest is in the folded state, the first mating surface of the rod ring is in contact with the first mating surface of the armrest, and the first mating surface of the chair back is separated from the first mating surface of the armrest.

14. The electric wheelchair according to claim 13, characterized in that: The first limiting block is provided with a second limiting surface of the chair back. The armrest includes a yielding state. When the armrest is in the yielding state, the second mating surface of the armrest is in contact with the second limiting surface of the chair back, and a side access channel is formed between the armrest and the side of the seat cushion.

15. The electric wheelchair according to claim 13, characterized in that: When the handrail is in use, there is a gap between the first mating surface of the rod and the first mating surface of the handrail.

16. The electric wheelchair according to claim 1, characterized in that: The main beam frame includes a main side rod, an upper connecting rod, and a lower connecting rod. The upper connecting rod and the lower connecting rod extend along the width direction. The two ends of the upper connecting rod and the two ends of the lower connecting rod are connected to the main side rod to form a frame structure. The two ends of the front connecting rod are rotatably connected to the front end of the lower connecting rod and the first connecting seat. The two ends of the rear drive push rod are rotatably connected to the upper connecting rod and the connecting beam frame.

17. The electric wheelchair according to claim 1, characterized in that: The connecting beam frame includes a bottom connecting rod, a middle support connecting rod, and a rear connecting plate. The bottom connecting rod extends in the front-to-back direction. The middle support connecting rod and the rear connecting plate are respectively connected to the bottom connecting rod on both sides in the width direction. The front end of the bottom connecting rod is rotatably connected to the lower end of the main beam frame. The lower end of the rear drive push rod is rotatably connected to the middle support connecting rod.

18. The electric wheelchair according to claim 17, characterized in that: The bottom connecting rod includes a first segment and a second segment. The first segment extends upward at an incline. The upper end of the first segment is rotatably connected to the lower end of the main beam frame. The lower end of the first segment is connected to the front end of the second segment. The rear end of the second segment is fixedly connected to the rear connecting plate.

19. The electric wheelchair according to claim 17, characterized in that: The rear connecting plate has bottom connecting plates on both sides in the width direction. The bottom connecting plates are rotatably connected to the rear connecting plate in the front-rear direction. The side of the bottom connecting plate away from the rear connecting plate is connected to the rear wheel.

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