Folding electric wheelchair

Abstract

The invention provides a folding electric wheelchair which comprises a locking assembly, a cushion support and a backrest support, the cushion support and the backrest support are in transmission connection, the locking assembly comprises a locking pin, a first locking groove, a second locking groove, an operation part and a locking spring, the operation part is connected with the locking pin through a traction unit, the operation part is movably arranged on the cushion support, and the locking spring is arranged on the cushion support. The first locking groove and the second locking groove are formed in the backrest support, the locking spring is suitable for driving the locking pin to be inserted into the first locking groove or the second locking groove, the locking pin extends into the first locking groove so that the folding electric wheelchair can be kept in an unfolded state, and the locking pin extends into the first locking groove so that the folding electric wheelchair can be kept in a folded state; the operation assembly is suitable for driving the locking pin to retreat from the first locking groove or the second locking groove through the traction unit so as to unlock. According to the folding electric wheelchair, by designing the locking assembly, convenient switching and stable locking of the folding electric wheelchair between the unfolding state and the folding state are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a foldable electric wheelchair. Background Art

[0002] In the existing electric wheelchair design, users have higher and higher requirements for the portability and space occupation of the wheelchair, especially for the travel needs of disabled people or elderly people, electric wheelchairs often need to be stored in the trunk. The existing electric wheelchairs may have problems such as complicated operation and unstable locking during folding and unfolding, which not only brings inconvenience to users, but also may affect the safety and reliability of the wheelchair. Summary of the invention

[0003] In view of the above-mentioned defects of the prior art, an object of the present invention is to provide a foldable electric wheelchair, aiming to solve the problems of inconvenient folding, difficult storage and unreliable locking mechanism of traditional electric wheelchairs.

[0004] To achieve the above object, the present invention provides a foldable electric wheelchair, comprising a locking assembly and a seat cushion bracket and a backrest bracket connected in a transmission manner.

[0005] The locking assembly includes a locking pin, a first locking groove, a second locking groove, an operating component and a locking spring, wherein the operating component is connected to the locking pin through a traction unit.

[0006] The operating component is movably disposed on the seat support, and the first locking groove and the second locking groove are formed on the backrest support.

[0007] The locking spring is suitable for driving the locking pin to be inserted into the first locking groove or the second locking groove, the locking pin extends into the first locking groove so that the foldable electric wheelchair remains in an unfolded state, and the locking pin extends into the first locking groove so that the foldable electric wheelchair remains in a folded state;

[0008] The operating assembly is suitable for driving the locking pin to withdraw from the first locking groove or the second locking groove through a traction unit to release the lock.

[0009] Preferably, the locking hook mechanism comprises two locking pins symmetrically arranged opposite to each other, the operating component is arranged in the middle of the two locking pins, and the operating component can be pressed, rotated or slid relative to the seat cushion bracket.

[0010] Preferably, the backrest bracket includes a guide groove, which is arc-shaped and suitable for connecting the first locking groove and the second locking groove. When the folding electric wheelchair is switched between a folded state and an unfolded state, the locking pin slides in the guide groove.

[0011] Preferably, the locking assembly also includes a spring magazine, which is installed on the seat cushion bracket, the locking spring accommodates the locking spring, the spring magazine includes an open end and a closed end, the locking pin is suitable for connecting to one axial end of the locking spring through the open end, the other axial end of the locking spring is connected to the closed end, and the traction unit is suitable for passing through the locking spring and being connected to the locking pin.

[0012] Preferably, the operating component includes a handle, the traction unit is a linear steel rope, the seat bracket is relatively fixedly provided with a handle shell, the handle can be extended and retracted relative to the handle shell, and the handle is formed with a limiting groove for the linear steel rope to be inserted; the locking pin is made of alloy material.

[0013] Preferably, the folding electric wheelchair comprises a first frame, a second frame, a first connecting rod suitable for connecting the first frame and the second frame, and a second connecting rod suitable for connecting the first frame and the seat support, the first frame and the second frame are pivotally connected to the backrest support, respectively, the first bracket, the bracket connecting rod, the second bracket and the backrest support are suitable for constituting a first link mechanism that can be linked, the first bracket, the second connecting rod, the seat support and the backrest support are suitable for constituting a second link mechanism that can be linked, and the locking assembly keeps the folding electric wheelchair in a folded state or an unfolded state by limiting the relative movement between the seat support and the backrest support.

[0014] Preferably, the first frame includes two parallel first longitudinal beams and a first cross beam suitable for connecting the two first longitudinal beams, the second frame includes two parallel second longitudinal beams, the first longitudinal beam and the second longitudinal beam are respectively pivotally connected to the backrest bracket, the first longitudinal beam and the second longitudinal beam are connected via the first connecting rod, and the seat bracket includes two parallel third longitudinal beams, and the third longitudinal beam is connected to the first cross beam via the second connecting rod.

[0015] Preferably, the first connecting rod includes a main body section and at least one extension section extending obliquely downward from one end of the main body section, the two ends of the main body section are respectively pivoted to the first longitudinal beam and the second longitudinal beam, the extension section is equipped with auxiliary wheels, and in the folded state, the auxiliary wheels touch the ground to provide partial support for the foldable electric wheelchair.

[0016] As a preference, it comprises a drive assembly, wherein the drive assembly comprises a motor, a battery pack suitable for supplying energy to the motor, a set of front wheels and a set of rear wheels.

[0017] The rear wheel is mounted on the second longitudinal beam, the motor is suitable for driving the rear wheel to rotate to provide driving force for the foldable electric wheelchair, the battery pack is mounted between the two second longitudinal beams, and the driving device also includes an anti-tilt wheel connected to the rear wheel.

[0018] A bearing seat is formed at one end of the first longitudinal beam, and a steering shaft is installed inside the bearing seat. The front wheel is universally connected to the first longitudinal beam through a wheel fork. The wheel fork includes a fork body and a connecting piece. The front wheel is installed on the fork body. The connecting piece is pivotally connected to the upper end of the fork body. The fork body includes a first platform, and the connecting piece includes a second platform. An elastic body is abutted between the first platform and the second platform. A movable groove is formed on the first platform, and the axial shaft passes through the second platform and the thickness of the elastic body and extends into the movable groove.

[0019] In the unfolded state, the fork body is tilted, the first platform is parallel to the second platform, and the steering axis is arranged along the direction of gravity; in the folded state, the fork body is arranged along the direction of gravity, the connecting member and the first longitudinal beam are flipped downward, and the steering axis moves accordingly in the movable groove.

[0020] The front wheels are flexible in steering and can also reduce vibration during driving and improve ride comfort. The rear wheels are mainly responsible for providing power and stability, while the front wheel group is responsible for providing steering flexibility and controllability. The coordinated work of the two enables the electric wheelchair to move safely and efficiently.

[0021] Preferably, the foldable electric wheelchair comprises an integrated pivot module, wherein the pivot module comprises a first active joint adapted to extend the backrest bracket, a first driven joint adapted to extend the first longitudinal beam, and a second driven joint adapted to extend the second longitudinal beam.

[0022] The first active joint includes an inner side surface and an outer side surface perpendicular to its rotation direction, the first driven joint and the second driven joint are respectively pivoted to the outer surface, the first locking groove, the second locking groove and the guide groove are formed on its inner surface, and the seat bracket is pivoted to its inner surface.

[0023] As a preferred embodiment: the first active joint includes a first stop plane and a first stop arc surface, the second driven joint includes a second stop plane and a second stop arc surface, in the expanded state, the first stop plane is tightly against the second stop plane, and the first stop arc surface and the second stop arc surface jointly support the first driven joint.

[0024] Preferably, the foldable electric wheelchair further comprises an armrest assembly and a foot pedal, the armrest assembly comprises two armrests respectively pivoted to the first joint, one of the armrests is provided with a controller, the controller is suitable for controlling the start and stop of the motor, and the foot pedal is pivoted to the first frame.

[0025] The beneficial effects of the present invention are:

[0026] 1. By designing an easy-to-operate locking assembly, the electric wheelchair can quickly and firmly switch between the folded state and the unfolded state. The operation is simple and the locking is firm. Specifically, (1) the operating component in the locking assembly is connected to the locking pin through a traction unit. The operating component can easily drive the locking pin to withdraw from the locking groove, thereby releasing the lock, allowing the backrest bracket and the seat cushion bracket to move relative to each other to complete the folding or unfolding action. (2) The locking spring can stably drive the locking pin to insert into the first locking groove or the second locking groove, ensuring that the foldable electric wheelchair remains stable in the unfolded state or the folded state, effectively avoiding structural loosening or state changes caused by accidental collision or vibration during use, and improving the safety and reliability of the wheelchair.

[0027] Moreover, the arc-shaped guide groove provided on the backrest bracket enables the locking pin to slide smoothly in the guide groove during folding and unfolding, thereby reducing the difficulty of operation, optimizing the smoothness of operation, and improving the stability of the structure.

[0028] Second, the first link mechanism and the second link mechanism are used to form a linkage relationship between the first frame, the second frame, the backrest bracket and the seat bracket, so that each component can move in coordination when folded, effectively reducing the overall volume. At the same time, the design of the pivot module integrates multiple joints into one, which not only simplifies the structure, but also improves the stability and reliability of the connection, making it easier to store and carry the wheelchair. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention provides a structural schematic diagram of a foldable electric wheelchair.

[0030] Figure 2 A side view of a foldable electric wheelchair provided by the present invention.

[0031] Figure 3 A three-dimensional schematic diagram of a foldable electric wheelchair provided by the present invention.

[0032] Figure 4 for Figure 3 A magnified schematic diagram of area A.

[0033] Figure 5 This is a schematic diagram of the connection between the seat support and the backrest support provided by the present invention.

[0034] Figure 6This is a schematic structural diagram of the locking assembly provided by the present invention.

[0035] Figure 7 This is a schematic structural diagram of the pivot module provided by the present invention.

[0036] In the figure, a first longitudinal beam 101, a second longitudinal beam 102, a first cross beam 103, a second cross beam 104, a first connecting rod 105, a second connecting rod 106, a seat bracket 107, a backrest bracket 108, a bearing seat 109, a steering shaft 110, a seat cross beam 111, a seat longitudinal beam 112, an armrest 113, a foot pedal 114, a main section 115, an extension section 116, a first active joint 117, a first driven joint 118, a second driven joint 119, a first stop plane 120, The first stop arc surface 121, the second stop plane 122, the second stop arc surface 123, the locking pin 201, the first locking groove 202, the second locking groove 203, the guide groove 204, the spring compartment 205, the traction unit 206, the handle shell 207, the handle 208, the motor 301, the battery pack 302, the front wheel 303, the rear wheel 304, the anti-roll wheel 305, the fork body 306, the connecting piece 307, the first platform 308, the second platform 309, the elastomer 310, and the movable groove 311. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0039] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0040] like Figure 1-7A folding electric wheelchair comprises a first frame, a second frame, a seat support 107, a backrest support 108, a first connecting rod 105 suitable for connecting the first frame and the second frame, a second connecting rod 106 suitable for connecting the first frame and the seat support 107, a driving assembly, a locking assembly and a pivoting module integrated into one. The first frame comprises two first longitudinal beams 101 arranged in parallel and a first cross beam 103 suitable for connecting the two first longitudinal beams 101, and the second frame comprises two second longitudinal beams 102 arranged in parallel. The first longitudinal beam 101 and the second longitudinal beam 102 are connected by a first connecting rod 105, and the seat support 107 comprises two third longitudinal beams arranged in parallel, and the third longitudinal beam is connected to the first cross beam 103 by a second connecting rod. The pivoting module comprises a first active joint 117 suitable for extending the backrest support 108, a first driven joint 118 suitable for extending the first longitudinal beam 101, and a second driven joint 119 suitable for extending the second longitudinal beam 102. The first active joint 117 includes an inner side and an outer side perpendicular to the rotation direction thereof, the first driven joint 118 and the second driven joint 119 are respectively pivoted to the outer surface, and the seat bracket 107 is pivoted to the inner surface thereof. The first bracket, the bracket connecting rod, the second bracket and the backrest bracket 108 are suitable for constituting a first link 105 mechanism that can be linked, the first bracket, the second link 106, the seat bracket 107 and the backrest bracket 108 are suitable for constituting a second link 106 mechanism that can be linked, and the locking assembly keeps the folding electric wheelchair in a folded state or an unfolded state by limiting the relative movement between the seat bracket 107 and the backrest bracket 108.

[0041] The locking assembly includes two locking pins 201, two first locking grooves 202, two second locking grooves 203, an operating component and two locking springs, the operating component is connected to the locking pins 201 through a traction unit 206, the operating component is arranged in the middle of the two locking pins 201, the operating component is movably mounted on the cushion bracket, the first locking groove 202 and the second locking groove 203 are formed on the inner surface of the first joint, and the locking spring is suitable for driving the locking pin 201 to insert into the first locking groove 202 or the second locking groove 203. Specifically, the locking pin 201 extends into the first locking groove 202 to keep the foldable electric wheelchair in an unfolded state, and the locking pin 201 extends into the first locking groove 202 to keep the foldable electric wheelchair in a folded state. The operating assembly is suitable for driving the locking pin 201 to withdraw from the first locking groove 202 or the second locking groove 203 through the traction unit 206 to release the lock.

[0042] In this embodiment, the first active joint 117 includes a first stop plane 120 and a first stop arc surface 121, and the second driven joint 119 includes a second stop plane 122 and a second stop arc surface 123. In the expanded state, the first stop plane 120 is tightly against the second stop plane 122, and the first stop arc surface 121 and the second stop arc surface 123 jointly support the first driven joint 118.

[0043] In this embodiment, the seat support 107 includes a seat crossbeam 111 and a seat longitudinal beam 112 disposed at both ends of the seat crossbeam 111, and the seat longitudinal beam 112 is pivotally connected to the first active joint 117. The seat crossbeam 111 is provided with a handle shell 207, and the operating component includes a handle 208. The traction unit 206 is a linear steel rope, and the handle 208 is formed with a limit groove for the linear steel rope to be inserted. The handle 208 is telescopic relative to the handle shell 207 along a direction perpendicular to the extension of the traction unit 206. The locking pin 201 is made of alloy. The seat crossbeam 111 is provided with a spring chamber 205 adjacent to the seat longitudinal beam 112, and the locking spring accommodates the locking spring. The spring chamber 205 includes an open end and a closed end. The locking pin 201 is suitable for connecting one axial end of the locking spring through the open end, and the other axial end of the locking spring is connected to the closed end. The traction unit 206 is suitable for passing through the locking spring and connecting to the locking pin 201.

[0044] In this embodiment, a guide groove 204 is formed on the inner surface of the first joint, which is suitable for connecting the first locking groove 202 and the second locking groove 203. The guide groove 204 is arc-shaped. When the folding electric wheelchair switches between the folded state and the unfolded state, the locking pin 201 slides in the guide groove 204.

[0045] In this embodiment, the driving assembly includes a motor 301, a battery pack 302 suitable for supplying energy to the motor 301, a set of front wheels 303 and a set of rear wheels 304. The rear wheels 304 are mounted on the second longitudinal beams 102, the motor 301 is suitable for driving the rear wheels 304 to rotate to provide driving force for the foldable electric wheelchair, the battery pack 302 is mounted between the two second longitudinal beams 102, and the driving device further includes an anti-tilt wheel 305 connected to the rear wheels 304. A bearing seat 109 is formed at one end of the first longitudinal beam 101, and a steering shaft 110 is installed inside the bearing seat 109. The front wheel 303 is universally connected to the first longitudinal beam 101 through a wheel fork. The wheel fork includes a fork body 306 and a connecting piece 307. The front wheel 303 is installed on the fork body 306. The connecting piece 307 is pivotally connected to the upper end of the fork body 306. The fork body 306 includes a first platform 308, and the connecting piece 307 includes a second platform 309. An elastic body 310 is abutted between the first platform 308 and the second platform 309. The first platform 308 is formed with a movable groove 311. The steering shaft 110 passes through the second platform 309 and the thickness of the elastic body 310 and extends into the movable groove 311.

[0046] In the unfolded state, the fork body 306 is tilted, the first platform 308 is parallel to the second platform 309, and the steering shaft 110 is arranged along the direction of gravity; in the folded state, the fork body 306 is arranged along the direction of gravity, the connector 307 and the first longitudinal beam 101 are turned downward, and the steering shaft 110 moves in the movable groove 311. The front wheel 303 is flexible in steering and can also reduce vibration during driving and improve riding comfort. The rear wheel 304 is mainly responsible for providing power and stability, while the front wheel 303 group is responsible for providing steering flexibility and controllability. The coordinated work of the two enables the electric wheelchair to move safely and effectively.

[0047] In this embodiment, the folding electric wheelchair further includes an armrest 113 assembly and a footrest 114. The armrest 113 assembly includes two armrests 113 respectively pivoted to the first joint, and one of the armrests 113 is provided with a controller, which is suitable for controlling the start and stop of the motor 301. The first frame further includes a second crossbeam 104 suitable for connecting the two bearing seats 109, and the footrest 114 is pivoted to the second crossbeam 104.

[0048] In this embodiment, the first connecting rod 105 includes a main section 115 and an extension section 116 extending obliquely downward from one end of the main section 115. The two ends of the main section 115 are respectively pivotally connected to the first longitudinal beam 101 and the second longitudinal beam 102. The extension section 116 is equipped with auxiliary wheels. In the folded state, the auxiliary wheels touch the ground to provide partial support for the foldable electric wheelchair.

[0049] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A foldable electric wheelchair, characterized in that: It includes a locking assembly and a seat cushion bracket and a backrest bracket connected by a transmission. The locking assembly includes a locking pin, a first locking groove, a second locking groove, an operating component and a locking spring, wherein the operating component is connected to the locking pin through a traction unit. The operating component is movably disposed on the seat support, and the first locking groove and the second locking groove are formed on the backrest support. The locking spring is suitable for driving the locking pin to be inserted into the first locking groove or the second locking groove, the locking pin extends into the first locking groove so that the foldable electric wheelchair remains in an unfolded state, and the locking pin extends into the first locking groove so that the foldable electric wheelchair remains in a folded state; The operating assembly is suitable for driving the locking pin to withdraw from the first locking groove or the second locking groove through a traction unit to release the lock.

2. A foldable electric wheelchair according to claim 1, characterized in that: The locking hook mechanism comprises two locking pins which are symmetrically arranged opposite to each other, and the operating component is arranged in the middle of the two locking pins. The operating component can be pressed, rotated or slid relative to the seat cushion bracket.

3. A foldable electric wheelchair according to claim 2, characterized in that: The backrest bracket includes a guide groove, which is arc-shaped and suitable for connecting the first locking groove and the second locking groove. When the folding electric wheelchair is switched between a folded state and an unfolded state, the locking pin slides in the guide groove.

4. A foldable electric wheelchair according to claim 3, characterized in that: The locking assembly also includes a spring magazine, which is installed on the seat cushion bracket. The locking spring accommodates the locking spring. The spring magazine includes an open end and a closed end. The locking pin is suitable for connecting to one axial end of the locking spring through the open end, and the other axial end of the locking spring is connected to the closed end. The traction unit is suitable for passing through the locking spring and being connected to the locking pin.

5. A foldable electric wheelchair according to claim 4, characterized in that: The foldable electric wheelchair comprises a first frame, a second frame, a first connecting rod suitable for connecting the first frame and the second frame, and a second connecting rod suitable for connecting the first frame and the seat support, the first frame and the second frame are pivotally connected to the backrest support, respectively, the first support, the support connecting rod, the second support and the backrest support are suitable for constituting a first connecting rod mechanism that can be linked, the first support, the second connecting rod, the seat support and the backrest support are suitable for constituting a second connecting rod mechanism that can be linked, and the locking assembly keeps the foldable electric wheelchair in a folded state or an unfolded state by limiting the relative movement between the seat support and the backrest support.

6. A foldable electric wheelchair according to claim 5, characterized in that: The first frame includes two parallel first longitudinal beams and a first cross beam suitable for connecting the two first longitudinal beams, the second frame includes two parallel second longitudinal beams, the first longitudinal beam and the second longitudinal beam are respectively pivotally connected to the backrest bracket, the first longitudinal beam and the second longitudinal beam are connected by the first connecting rod, and the seat bracket includes two parallel third longitudinal beams, and the third longitudinal beam is connected to the first cross beam through the second connecting rod.

7. A foldable electric wheelchair according to claim 6, characterized in that: comprising a drive assembly, the drive assembly comprising a motor, a battery pack suitable for powering the motor, a set of front wheels and a set of rear wheels, The rear wheel is mounted on the second longitudinal beam, the motor is suitable for driving the rear wheel to rotate to provide driving force for the foldable electric wheelchair, and the battery pack is mounted between the two second longitudinal beams; A bearing seat is formed at one end of the first longitudinal beam, a steering shaft is installed inside the bearing seat, the front wheel is universally connected to the first longitudinal beam through a wheel fork, the wheel fork includes a fork body and a connector, the front wheel is installed on the fork body, the connector is pivotally connected to the upper end of the fork body, the fork body includes a first platform, the connector includes a second platform, an elastic body is abutted between the first platform and the second platform, a movable groove is formed on the first platform, the axial shaft passes through the second platform and the thickness of the elastic body and extends into the movable groove, In the unfolded state, the fork body is tilted, the first platform is parallel to the second platform, and the steering axis is arranged along the direction of gravity; in the folded state, the fork body is arranged along the direction of gravity, the connecting member and the first longitudinal beam are flipped downward, and the steering axis moves accordingly in the movable groove.

8. The foldable electric wheelchair according to claim 6, characterized in that: The invention comprises an integrated pivot module, wherein the pivot module comprises a first active joint adapted to extend the backrest bracket, a first driven joint adapted to extend the first longitudinal beam, and a second driven joint adapted to extend the second longitudinal beam. The first active joint includes an inner side surface and an outer side surface perpendicular to its rotation direction, the first driven joint and the second driven joint are respectively pivoted to the outer surface, the first locking groove, the second locking groove and the guide groove are formed on its inner surface, and the seat bracket is pivoted to its inner surface.

9. A foldable electric wheelchair according to claim 8, characterized in that: The first active joint includes a first stop plane and a first stop arc surface, and the second driven joint includes a second stop plane and a second stop arc surface. In the expanded state, the first stop plane is tightly against the second stop plane, and the first stop arc surface and the second stop arc surface jointly support the first driven joint.

10. A foldable electric wheelchair according to claim 9, characterized in that: It also includes an armrest assembly and a foot pedal. The armrest assembly includes two armrests respectively pivoted to the first joints, one of the armrests is provided with a controller, and the controller is suitable for controlling the start and stop of the motor. The foot pedal is pivoted to the first frame.

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