Footrest assembly for electric wheelchair

Abstract

The present invention relates to an electric wheelchair, and more specifically to a footrest assembly for an electric wheelchair. A footrest assembly for an electric wheelchair comprises a footrest fixing seat fixed to the front side of a wheelchair frame seat, a foot pedal is fixed to the lower end of the footrest fixing seat, a folding connecting rod is provided between the wheelchair frame seat and the footrest fixing seat, the folding connecting rod comprises at least a first connecting rod and a second connecting rod, the upper end of the first connecting rod is rotatably fixed to the front end of the wheelchair frame seat, the lower end of the first connecting rod is rotatably fixed to the rear end of the second connecting rod, the front end of the second connecting rod is fixed to the footrest fixing seat, and under the action of a driving mechanism, the connection between the first connecting rod and the second connecting rod moves forward and upward, so that the folding connecting rod is unfolded, and the footrest fixing seat moves forward and upward synchronously. The present invention has the advantages of being more compact in structure, not needing to occupy the space below the wheelchair frame seat, and being easy to adjust the position of the footrest.

Description

Technical Field

[0001] The invention relates to an electric wheelchair, in particular to a pedal assembly for an electric wheelchair. Background Art

[0002] To facilitate the use of the wheelchair and to help users switch between sitting and lying positions, a Chinese patent with application number 202020384369.8 discloses a foot pedal adjustment auxiliary device, including a seat frame, a driving member, a connecting rod, a foot pedal and a leg rest, the leg rest being hinged to the seat frame, the first end of the driving member being hinged to the bottom of the seat frame, the second end of the driving member being hinged to the leg rest at the upper and middle part of the leg rest, the end of the leg rest being hinged to the foot pedal at the middle end of the foot pedal, the upper end of the connecting rod being hinged to the bottom of the seat frame, and the lower end of the connecting rod being hinged to the end of the foot pedal, and the position of the leg rest and the foot pedal can be adjusted by extending and retracting the driving member.

[0003] The above scheme has the following defects: in order to achieve the angle adjustment of the footrest, it is necessary to set a connecting rod and a driving part under the seat frame, which will occupy the space under the seat frame and is not convenient for setting the hub motor and the battery box under the seat frame. As a result, the hub motor and the battery box are set backward, causing the overall center of the electric wheelchair to move backward, and there is a risk of the wheelchair tipping over when going uphill or passing through uneven roads. Summary of the invention

[0004] The object of the present invention is to provide a footrest assembly for an electric wheelchair which has a more compact structure, occupies less space under a wheelchair frame seat, and is convenient for adjusting the position of the footrest.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a footrest assembly for an electric wheelchair, comprising a footrest fixing seat fixed to the front side of a wheelchair frame seat, a foot pedal extending forward is fixed to the lower end of the footrest fixing seat, and the footrest fixing seat adjusts its position through a driving mechanism, a folding connecting rod is provided between the wheelchair frame seat and the footrest fixing seat, the folding connecting rod at least comprises a first connecting rod and a second connecting rod, the upper end of the first connecting rod is rotatably fixed to the front end of the wheelchair frame seat, the lower end of the first connecting rod is rotatably fixed to the rear end of the second connecting rod, and the front end of the second connecting rod is fixed to the footrest fixing seat, the driving mechanism comprises a linear telescopic drive with adjustable length, the upper end of the linear telescopic drive is rotatably fixed under the wheelchair frame seat and close to the front end of the wheelchair frame seat, the lower end of the linear telescopic drive is rotatably connected and linked with the folding connecting rod, and under the action of the driving mechanism, the connection between the first connecting rod and the second connecting rod moves forward and upward, so that the folding connecting rod is unfolded and the footrest fixing seat moves forward and upward synchronously.

[0006] The present invention arranges a first connecting rod at the front end of the wheelchair frame seat, and the first connecting rod and the second connecting rod form an angle-adjustable two-connecting rod, so that the extension and contraction of the linear telescopic drive can drive the footrest fixing seat to swing back and forth while adjusting the upper and lower heights, and can realize the position and angle adjustment of the footrest fixing seat and the foot pedal. At the same time, the upper end of the linear telescopic drive is close to the front end of the wheelchair frame seat, which can further reduce the space occupied by the footrest assembly of the present invention and reduce the space occupied by the footrest assembly of the present invention under the wheelchair frame seat.

[0007] Preferably, the folding link also includes a third link and a fourth link, the upper ends of the first link and the third link are both rotationally fixed to the wheelchair frame, and the upper end of the first link is located in front of the upper end of the third link, the front ends of the second link and the fourth link are both rotationally fixed to the footrest fixing seat, the front end of the fourth link is located on the upper side of the front end of the second link, the rear end of the fourth link is rotationally fixed to the lower end of the third link, and the middle part of the fourth link is rotationally fixed to the middle part of the first link. By providing the third link and the fourth link, the fixing effect of the footrest fixing seat can be improved while making the assembly structure of the present invention more compact, and the shaking of the footrest fixing seat can be avoided, so as to improve the supporting effect on the calf.

[0008] Preferably, the upper end of the third connecting rod is located at the lower side of the upper end of the first connecting rod, the lower end of the linear telescopic drive is connected to the lower end of the first connecting rod, the hinge between the linear telescopic drive and the first connecting rod is lower than the hinge between the first connecting rod and the second connecting rod, and the hinge between the linear telescopic drive and the wheelchair frame is higher than the hinge between the third connecting rod and the seat of the wheelchair frame.

[0009] Through the above arrangement, the footrest assembly of the present invention can be smaller in size and more compact in structure without having to be lifted, thereby not occupying the space under the wheelchair seat, making it easier to arrange components such as a controller and a battery box under the wheelchair seat.

[0010] Preferably, a protective belt is provided between the front end of the wheelchair frame seat and the upper end of the footrest fixing seat, and the upper end of the footrest fixing seat is provided with a through groove penetrating up and down for allowing the protective belt to pass through. The folding connecting rod has a first fixing point for fixing to the end of the protective belt and a matching point for bending and folding the protective belt. The wheelchair frame seat has a second fixing point for fixing to the end of the protective belt, the first fixing point is located on the fourth connecting rod, the matching point is located on the first connecting rod, and the first fixing point is relatively located between the matching point and the second fixing point.

[0011] By providing a protective belt, the user's clothes or even limbs are prevented from entering the folding connecting rod and the linear telescopic drive, and the clothes are prevented from getting stuck in the column, thereby improving the safety of use. The present invention can guide the protective belt by providing a first fixing point, a second fixing point, a through groove and a matching point, and ensure that the protective belt can always cover between the wheelchair frame seat and the footrest fixing seat during the process of the folding connecting rod being unfolded or retracted.

[0012] Preferably, the first connecting rod and the fourth connecting rod both have a transverse section extending in the left-right direction, and the end of the protective belt away from the wheelchair frame seat is fixed to the transverse section of the fourth connecting rod, and the protective belt is surrounded by the transverse section of the first connecting rod, or the transverse plate of the first connecting rod is provided with a through-passing groove, and the protective belt is fixed to the transverse plate of the fourth connecting rod after passing through the through-passing groove.

[0013] Preferably, two folding connecting rods are arranged between the wheelchair frame seat and the footrest fixing seat, and the horizontal section is located between the two folding connecting rods. The horizontal plate not only facilitates the fixing and bending of the protection belt, but also improves the structural strength of the folding connecting rod.

[0014] Preferably, the footrest fixing seat includes a shielding plate located at the front side of the lower end of the folding connecting rod, and the footrest is arranged at the lower end of the shielding plate. The shielding plate is not only used to directly support the calf, but also to prevent the leg or leg clothing from being stuck at the folding connecting rod, further improving the safety of the footrest assembly of the present invention when in use.

[0015] The invention has the advantages of more compact structure, no need to occupy the space under the seat of the wheelchair frame, and easy adjustment of the position of the foot pedal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the folding connecting rod of the present invention when it is unfolded.

[0018] Figure 3 It is a side view of the folding connecting rod of the present invention when it is unfolded. DETAILED DESCRIPTION

[0019] The present invention will be further described below based on the accompanying drawings and specific embodiments.

[0020] Depend on Figures 1 to 3As shown, this embodiment discloses a footrest assembly for an electric wheelchair, which is connected to a mounting seat 1, and the mounting seat 1 is arranged at the lower side of the front end of the wheelchair frame seat plate. The footrest assembly includes a footrest fixing seat 2 with a footrest 21 extending forward fixed at the lower end, a folding connecting rod connecting the mounting seat 1 and the footrest fixing seat 2, and a driving mechanism for realizing the folding and unfolding of the folding connecting rod. Among them, the lower side of the mounting seat 1 is connected to two folding connecting rods arranged opposite to each other on the left and right, and the two folding connecting rods are arranged symmetrically on the left and right. Among them, the footrest fixing seat includes a shielding plate 22 located at the front side of the lower end of the folding connecting rod, and the footrest 21 is arranged at the lower end of the shielding plate 22.

[0021] The folding connecting rod includes a first connecting rod 31, a second connecting rod 32, a third connecting rod 33 and a fourth connecting rod 34. The upper ends of the first connecting rod 31 and the third connecting rod 33 are both rotatably fixed to the mounting base 1 of the wheelchair frame seat plate, and the upper end of the first connecting rod 31 is located in front of the upper end of the third connecting rod 33. The front ends of the second connecting rod 32 and the fourth connecting rod 34 are both rotatably fixed to the shielding plate 22 of the footrest fixing base 2. The front end of the second connecting rod 32 is connected to the rear side of the middle part of the shielding plate 22. The front end of the fourth connecting rod 34 is located on the upper side of the front end of the second connecting rod 32 and is connected to the rear side of the upper end of the shielding plate 22. The rear end of the fourth connecting rod 34 is rotatably fixed to the lower end of the third connecting rod 33, and the middle part of the fourth connecting rod 34 is rotatably fixed to the middle part of the first connecting rod 31.

[0022] The driving mechanism of this embodiment includes a linear telescopic actuator 10 whose length can be adjusted. The linear telescopic actuator 10 is an electric push rod. The rear end of the mounting seat 1 is provided with two downwardly extending extensions 11. The upper end of the linear telescopic actuator 10 is rotatably fixed between the two extensions 11. The upper end of the third connecting rod 33 is rotatably fixed with the extension 11. The upper end of the third connecting rod 33 is located at the lower side of the upper end of the first connecting rod 31. The hinge of the linear telescopic actuator 10 and the extension 11 is higher than the hinge of the third connecting rod 33 and the extension 11. The lower end of the linear telescopic actuator 10 is connected to the lower end of the first connecting rod 31. The hinge of the linear telescopic actuator 10 and the first connecting rod 31 is lower than the hinge of the first connecting rod 31 and the second connecting rod 32. The hinge of the linear telescopic actuator 10 and the mounting seat 1 is higher than the hinge of the third connecting rod 33 and the extension 11. When the linear telescopic driver 10 of the driving mechanism is extended, the connection between the first connecting rod 31 and the second connecting rod 32 moves forward and upward, so that the folding connecting rod is unfolded and the footrest fixing seat 2 moves forward and upward synchronously.

[0023] Depend on Figure 1 and Figure 2 As shown, the first link 31, the second link 32, the third link 33 and the fourth link 34 all have a transverse section 30 extending in the left-right direction. The transverse section 30 at the lower part of the first link 31 is provided with a strip-shaped clearance groove 311 running through the front and back. The transverse section 30 of the fourth link 34 is close to the baffle plate 22 and is cylindrical.

[0024] A protective belt 4 is provided between the front end of the mounting seat 1 of the wheelchair frame seat and the upper end of the footrest fixing seat 2. The upper end of the footrest fixing seat 2 is provided with a through groove 20 that passes through from top to bottom for the protective belt to pass through. The transverse section 30 of the fourth connecting rod 34 is provided with a first fixing point for fixing to one end of the protective belt 4. The upper end surface of the mounting seat 1 is provided with a second fixing point 12 for fixing to the other end of the protective belt 4. The transverse section of the first connecting rod 31 is provided with a matching point for bending and folding the protective belt 4. The matching point is the yield groove 311. The protective belt 4 is bent after passing through the yield groove 311. The first fixing point is relatively located between the matching point and the second fixing point.

[0025] In this embodiment, it is only necessary to set a mounting seat at the lower side of the front end of the wheelchair frame seat of the original wheelchair, and then set the footrest assembly. When the footrest assembly is not unfolded, the footrest assembly does not occupy the space under the wheelchair frame seat. The structure is compact, which is convenient for setting the battery box, controller and hub motor, and can make the overall center of the wheelchair relatively forward to reduce the possibility of the wheelchair tipping backward when climbing a slope or passing through an uneven road surface. The present invention has the advantages of a more compact structure, no need to occupy the space under the wheelchair frame seat, and easy adjustment of the footrest position.

Claims

1. A footrest assembly for an electric wheelchair, comprising a footrest fixing seat fixed to the front side of a wheelchair frame seat, a foot pedal extending forward is fixed to the lower end of the footrest fixing seat, and the footrest fixing seat adjusts its position through a driving mechanism, characterized in that: A folding link is provided between the wheelchair frame seat and the footrest fixing seat, and the folding link at least includes a first link and a second link, the upper end of the first link is rotatably fixed to the front end of the wheelchair frame seat, the lower end of the first link is rotatably fixed to the rear end of the second link, and the front end of the second link is fixed to the footrest fixing seat, and the driving mechanism includes a linear telescopic driver with adjustable length, the upper end of the linear telescopic driver is rotatably fixed under the wheelchair frame seat and close to the front end of the wheelchair frame seat, and the lower end of the linear telescopic driver is rotatably connected and linked with the folding link, and under the action of the driving mechanism, the connection between the first link and the second link moves forward and upward, so that the folding link is unfolded, and the footrest fixing seat moves forward and upward synchronously; The folding connecting rod also includes a third connecting rod and a fourth connecting rod, the upper ends of the first connecting rod and the third connecting rod are both rotatably fixed to the wheelchair frame seat plate, and the upper end of the first connecting rod is located in front of the upper end of the third connecting rod, the front end of the second connecting rod and the front end of the fourth connecting rod are both rotatably fixed to the footrest fixing seat, the front end of the fourth connecting rod is located on the upper side of the front end of the second connecting rod, the rear end of the fourth connecting rod is rotatably fixed to the lower end of the third connecting rod, and the middle part of the fourth connecting rod is rotatably fixed to the middle part of the first connecting rod; The upper end of the third connecting rod is located at the lower side of the upper end of the first connecting rod, the lower end of the linear telescopic drive is connected to the lower end of the first connecting rod, the hinged part of the linear telescopic drive and the first connecting rod is lower than the hinged part of the first connecting rod and the second connecting rod, and the hinged part of the linear telescopic drive and the seat plate of the wheelchair frame is higher than the hinged part of the third connecting rod and the seat plate of the wheelchair frame; A protective belt is provided between the front end of the wheelchair frame seat and the upper end of the footrest fixing seat, and a through groove is provided on the upper end of the footrest fixing seat which passes through the through groove up and down for the protective belt to pass through. The folding connecting rod has a first fixing point for fixing to the end of the protective belt and a matching point for bending and folding the protective belt. The wheelchair frame seat has a second fixing point for fixing to the end of the protective belt, the first fixing point is located on the fourth connecting rod, the matching point is located on the first connecting rod, and the first fixing point is relatively located between the matching point and the second fixing point.

2. The footrest assembly for an electric wheelchair according to claim 1, characterized in that: The first connecting rod and the fourth connecting rod both have a transverse section extending in the left-right direction, and the end of the protective belt away from the wheelchair frame seat is fixed to the transverse section of the fourth connecting rod, and the protective belt is surrounded by the transverse section of the first connecting rod, or the transverse plate of the first connecting rod is provided with a through-passing groove, and the protective belt is fixed to the transverse plate of the fourth connecting rod after passing through the through-passing groove.

3. The footrest assembly for an electric wheelchair according to claim 2, characterized in that: Two folding connecting rods arranged opposite to each other are arranged between the seat plate of the wheelchair frame and the footrest fixing seat, and the horizontal section is located between the two folding connecting rods.

4. The footrest assembly for an electric wheelchair according to claim 1, characterized in that: The footrest fixing seat comprises a shielding plate located at the front side of the lower end of the folding connecting rod, and the footrest is arranged at the lower end of the shielding plate.

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