Adjustable pedal structure of electric wheelchair

Abstract

According to the adjustable pedal structure of the electric wheelchair, the electric wheelchair comprises a chair seat, a chair back, a walking mechanism and armrests, the chair seat comprises a chair seat front longitudinal beam, a chair seat rear longitudinal beam, a chair seat left cross beam, a chair seat right cross beam and a seat cushion, and the walking mechanism comprises a front wall plate, a rear wall plate, a first front wheel, a second front wheel, a first driving wheel and a second driving wheel. The pedal structure comprises a front footrest plate, a front footrest plate hinge arm, a front footrest plate hinge arm fixing frame, a rear footrest plate, a rear footrest plate hinge arm and a rear footrest plate hinge arm fixing frame, and is characterized in that the seat front longitudinal beam is a rectangular tube with a front longitudinal beam hollow cavity, and the seat rear longitudinal beam is a rectangular tube with a rear longitudinal beam hollow cavity; a front footrest hinge arm fixing frame adjusting rod is fixed to the right side of the front footrest hinge arm fixing frame, a rear footrest hinge arm fixing frame adjusting rod is fixed to the right end of the rear footrest hinge arm fixing frame, and the rear footrest hinge arm fixing frame adjusting rod is matched with a hollow cavity of the rear longitudinal beam and locked through a rear locking screw knob. The seat has the advantage that a passenger feels the comfort after the position is changed.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric wheelchair vehicles, and particularly relates to an adjustable footrest structure for an electric wheelchair vehicle. Background Art

[0002] The aforementioned electric wheelchair vehicle is customarily abbreviated as "electric wheelchair", which is a means of transportation for special groups such as the disabled, the elderly and infirm, and those who are affected by illness and unable to walk independently. With China entering the aging era, the total market demand for electric wheelchair vehicles is increasing continuously, and a large amount of technical information related to electric wheelchair vehicles can be found in the publicly disclosed Chinese patent literature. For example, CN2745544Y (multifunctional electric wheelchair vehicle), CN201379725Y (obstacle-avoiding electric wheelchair vehicle), CN101589979B (a multifunctional electric wheelchair vehicle), CN201684098U (electric wheelchair vehicle), CN102764185B (electric wheelchair vehicle), CN202682214U (electric wheelchair), CN103202748A (anti-tipping electric wheelchair vehicle), CN201379725Y (obstacle-avoiding electric wheelchair vehicle), CN302198767U (four-wheel electric vehicle), CN204521270U (a folding wheelchair vehicle), CN107468438A (folding electric wheelchair vehicle), CN102688124B (linkage-controlled flat-lying electric wheelchair vehicle), and CN113797033B (a lying posture adjustable electric wheelchair), and so on.

[0003] The common drawbacks not limited to the above-mentioned electric wheelchair vehicles are as follows: Since the distance between a pair of corresponding footrests (also called "footrest boards") and the seat is once assembled and sold by the manufacturer, it cannot be adjusted as needed during actual use. More specifically, taking the traveling direction of the electric wheelchair vehicle as an example, the position of a pair of footrests corresponding to the front lower part of the seat cannot be adjusted forward and backward as needed. Therefore, due to the inability to adjust the position of the footrests, the position of the wheelchair rider's buttocks on the seat cushion of the seat basically remains unchanged, thus bringing discomfort to the rider, because the angle between the rider's calf and thigh does not change for a long time, which is likely to cause poor blood flow. Especially for the elderly, the blood vessel elasticity of both lower limbs is much weaker than that of normal people, so the blood return speed slows down, and some may cause bilateral lower limb edema and / or calf edema. The ideal method is to reasonably adjust the position of the footrests every now and then. Summary of the Utility Model

[0004] The task of the utility model is to provide an adjustable footrest structure for an electric wheelchair vehicle, which helps to adjust the distance between the footrest board and the seat as needed, so that the rider can feel the comfort after the position change and avoid adverse factors such as calf edema and foot numbness caused by sitting in the same position all the time.

[0005] The task of the present utility model is completed as follows. An adjustable footrest structure for an electric wheelchair, the electric wheelchair including a seat, a backrest, a traveling mechanism, and a pair of armrests. The seat includes a front longitudinal beam of the seat, a rear longitudinal beam of the seat, a left cross beam of the seat, a right cross beam of the seat, and a seat cushion. The front and rear longitudinal beams of the seat are parallel to each other in the front-back direction in the length direction. The left cross beam of the seat is connected between the opposite sides of the left ends of the front and rear longitudinal beams of the seat. The right cross beam of the seat is connected between the opposite sides of the right ends of the front and rear longitudinal beams of the seat. The seat cushion is fixedly laid on the upper sides of the front and rear seat beams, the left cross beam of the seat, and the right cross beam of the seat. The backrest includes a backrest frame and a back pad. The shape of the backrest frame is in an inverted U shape and the lower end is hinged to the right ends of the front longitudinal beam of the seat and the rear longitudinal beam of the seat. The back pad is fixedly laid on the left side of the backrest frame. The traveling mechanism includes a front wall panel, a rear wall panel, a first front wheel, a second front wheel, a first drive wheel, and a second drive wheel. The front wall panel is fixed to the front longitudinal beam of the seat. The rear wall panel is fixed to the rear longitudinal beam of the seat. The first front wheel is rotatably arranged at the left end of the front wall panel through a first front wheel seat. The first drive wheel is rotatably arranged at the right end of the front wall panel. The second front wheel is rotatably arranged at the left end of the rear wall panel through a second front wheel seat. The second drive wheel is rotatably arranged at the right end of the rear wall panel. One of the pair of armrests located in the front is hinged between the right end of the front longitudinal beam of the seat and the front side of the backrest frame, and one of the pair of armrests located in the rear is hinged between the right end of the rear longitudinal beam of the seat and the rear side of the backrest frame. The footrest structure includes a front footrest, a front footrest hinge arm, a front footrest hinge arm fixing bracket, a rear footrest, a rear footrest hinge arm, and a rear footrest hinge arm fixing bracket. The front footrest is hinged to the lower end of the front footrest hinge arm. The front footrest hinge arm fixing bracket is fixed to the upper end of the front footrest hinge arm, and the front footrest hinge arm fixing bracket is connected to the left end of the front longitudinal beam of the seat. The rear footrest is hinged to the lower end of the rear footrest hinge arm. The rear footrest hinge arm fixing bracket is fixed to the upper end of the rear footrest hinge arm, and the rear footrest hinge arm fixing bracket is connected to the left end of the rear longitudinal beam of the seat. It is characterized in that: the front longitudinal beam of the seat is a rectangular tube with a front longitudinal beam hollow cavity formed therein. The rear longitudinal beam of the seat is a rectangular tube with a rear longitudinal beam hollow cavity formed therein. On the right side of the front footrest hinge arm fixing bracket and at a position corresponding to the front longitudinal beam hollow cavity, a front footrest hinge arm fixing bracket adjusting rod is fixed in a horizontal state. The front footrest hinge arm fixing bracket adjusting rod is slidably engaged with the front longitudinal beam hollow cavity in a left-right adjustable manner and is locked by a front locking screw knob screwed on the front side of the left end of the front longitudinal beam of the seat. On the right end of the rear footrest hinge arm fixing bracket and at a position corresponding to the rear longitudinal beam hollow cavity, a rear footrest hinge arm fixing bracket adjusting rod is fixed in a horizontal state. The rear footrest hinge arm fixing bracket adjusting rod is slidably engaged with the rear longitudinal beam hollow cavity in a left-right adjustable manner and is locked by a rear locking screw knob screwed on the rear side of the left end of the rear longitudinal beam of the seat.

[0006] In the present utility model, a left wall panel support connecting pipe is fixed between the opposite sides of the left ends of the front wall panel and the rear wall panel, and a right wall panel support connecting pipe is fixed between the opposite sides of the right ends of the front wall panel and the rear wall panel.

[0007] In the present utility model, the lower end of the chair back frame is hinged to the opposite sides of the right ends of the front longitudinal beam of the seat and the rear longitudinal beam of the seat through a chair back frame hinge seat.

[0008] In the present utility model, a battery rack is connected between the opposite sides of the front longitudinal beam of the seat and the rear longitudinal beam of the seat. A group of batteries is arranged on the battery rack. The number of batteries in this group is three and they are electrically connected to an electrical controller arranged below the right end of the seat. Each of the first driving wheel and the second driving wheel is driven by a driving wheel motor, and the driving wheel motor is electrically connected to the electrical controller.

[0009] In the present utility model, a chair back angle adjustment mechanism is arranged on the chair back frame.

[0010] In the present utility model, the seat cushion and the back cushion are sponge cushions.

[0011] In the present utility model, a manual operation controller is arranged at the left end of the rear-side armrest among the pair of armrests, and the manual operation controller is electrically connected to the electrical controller for electrical control.

[0012] Since the front and rear longitudinal beams of the seat in the technical solution provided by the present utility model respectively form front and rear longitudinal beam hollow cavities, and since an adjustment rod for the front and rear footrest hinge arm fixing frames is horizontally fixed on the right sides of the front and rear footrest hinge arm fixing frames respectively, the positions of the front and rear footrests and the seat are correspondingly changed by the sliding fit of the adjustment rod for the front and rear footrest hinge arm fixing frames with the front and rear longitudinal beam hollow cavities and the position adjustment as needed, enabling the rider to feel the comfort after the position change and avoiding problems such as calf edema and foot numbness caused by sitting in the same position for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENT

[0014] In order to more clearly understand the technical essence and beneficial effects of the present utility model, detailed descriptions will be made below in the form of embodiments. However, the descriptions of the embodiments are not limitations to the technical solution of the present utility model. Any equivalent transformation that is merely formal rather than substantial based on the concept of the present utility model should be regarded as falling within the scope of the technical solution of the present utility model.

[0015] In the following description, any concepts of directionality or orientation such as up, down, left, right, front, and back that may be involved are based on the Figure 1 position state shown, and thus cannot be understood as a special limitation on the technical solution provided by the present utility model.

[0016] Please refer to Figure 1 , which shows the seat 1, backrest 2, traveling mechanism 3, and a pair of armrests 4 of the structural system of an electric wheelchair. The seat 1 includes a front seat longitudinal beam 11, a rear seat longitudinal beam 12, a left seat cross beam 13, a right seat cross beam 14, and a seat cushion 15. The front and rear seat longitudinal beams 11 and 12 are parallel to each other in the front and rear in the length direction. The left seat cross beam 13 is connected between the opposite sides of the left ends of the front and rear seat longitudinal beams 11 and 12. The right seat cross beam 14 is connected between the opposite sides of the right ends of the front and rear seat longitudinal beams 11 and 12. The seat cushion 15 is fixedly laid on the upper sides of the front and rear seat beams 11 and 12, the left seat cross beam 13, and the right seat cross beam 14. The backrest 2 includes a backrest frame 21 and a back pad 22. The shape of the backrest frame 21 is in an inverted U shape and the lower end is hinged to the right ends of the aforementioned front seat longitudinal beam 11 and the rear seat longitudinal beam 12. The back pad 22 is fixedly laid on the left side of the backrest frame 21. The traveling mechanism 3 includes a front wall plate 31, a rear wall plate 32, a first front wheel 33, a second front wheel 34, a first drive wheel 35, and a second drive wheel 36. The front wall plate 31 is fixed to the front seat longitudinal beam 11. The rear wall plate 32 is fixed to the rear seat longitudinal beam 12. The first front wheel 33 is rotatably arranged at the left end of the front wall plate 31 through a first front wheel seat 331. The first drive wheel 35 is rotatably arranged at the right end of the front wall plate 31. The second front wheel is rotatably arranged at the left end of the rear wall plate 32 through a second front wheel seat 341. The second drive wheel 36 is rotatably arranged at the right end of the rear wall plate 32. One of the pair of armrests 4 located in the front is hinged between the right end of the aforementioned front seat longitudinal beam 11 and the front side of the backrest frame 21, and one of the pair of armrests 4 located in the rear is hinged between the right end of the aforementioned rear seat longitudinal beam 12 and the rear side of the backrest frame 21; it shows the front footrest 5a, the front footrest hinge arm 5b, the front footrest hinge arm fixing bracket 5c, the rear footrest 6a, the rear footrest hinge arm 6b, and the rear footrest hinge arm fixing bracket 6c of the footrest structure system. The front footrest 5a is hinged to the lower end of the front footrest hinge arm 5b. The front footrest hinge arm fixing bracket 5c is fixed to the upper end of the front footrest hinge arm 5b, and the front footrest hinge arm fixing bracket 5c is connected to the left end of the aforementioned front seat longitudinal beam 11. The rear footrest 6a is hinged to the lower end of the rear footrest hinge arm 6b. The rear footrest hinge arm fixing bracket 6c is fixed to the upper end of the rear footrest hinge arm 6b, and the rear footrest hinge arm fixing bracket 6c is connected to the left end of the aforementioned rear seat longitudinal beam 12.

[0017] Technical key points of the technical solution provided by the present utility model: The aforementioned front longitudinal beam 11 of the seat is a rectangular tube forming a front longitudinal beam hollow cavity 111, and the aforementioned rear longitudinal beam 12 of the seat is a rectangular tube forming a rear longitudinal beam hollow cavity 121. On the right side of the aforementioned front footrest hinge arm fixing bracket 5c and at a position corresponding to the aforementioned front longitudinal beam hollow cavity 111, a front footrest hinge arm fixing bracket adjusting rod 5d is fixed horizontally. The front footrest hinge arm fixing bracket adjusting rod 5d is slidably engaged with the aforementioned front longitudinal beam hollow cavity 111 for left and right adjustment and is locked by a front locking screw knob 112 screwed on the front side of the left end of the seat front longitudinal beam. On the right end of the aforementioned rear footrest hinge arm fixing bracket 6c and at a position corresponding to the aforementioned rear longitudinal beam hollow cavity 121, a rear footrest hinge arm fixing bracket adjusting rod 6d is fixed horizontally. The rear footrest hinge arm fixing bracket adjusting rod 6d is slidably engaged with the aforementioned rear longitudinal beam hollow cavity 121 for left and right adjustment and is locked by a rear locking screw knob 122 screwed on the rear side of the left end of the seat rear longitudinal beam 12.

[0018] When it is necessary to adjust the position of the front footrest 5a to the left to increase the distance from the seat 1, just loosen the front locking screw knob 112, pull the front footrest hinge arm fixing bracket adjusting rod 5d to the left. After reaching the desired degree, then tighten the front locking screw knob 112, and vice versa. Since the adjustment of the position of the rear footrest 6a to the left is exactly the same as the adjustment of the front footrest 5a, the applicant will not repeat it here.

[0019] In the present utility model, a wall panel left support connecting pipe 37a is fixed between the opposite sides of the left ends of the aforementioned front wall panel 31 and the rear wall panel 32, and a wall panel right support connecting pipe 37b is fixed between the opposite sides of the right ends of the front wall panel 31 and the rear wall panel 32.

[0020] In the present utility model, the lower end of the aforementioned backrest frame 21 is hinged to the opposite sides of the right ends of the aforementioned front longitudinal beam 11 of the seat and the rear longitudinal beam 12 of the seat through a backrest frame hinge seat 211.

[0021] In the present utility model, a battery rack 16 is connected between the opposite sides of the aforementioned front longitudinal beam 11 of the seat and the rear longitudinal beam 12 of the seat. A set of batteries 161 is provided on the battery rack 16. The number of the set of batteries 161 is three, but is not limited to three. And the set of batteries 161 is electrically connected to an electrical controller provided below the right end of the seat 1. The aforementioned first driving wheel 35 and the second driving wheel 36 are each driven by a driving wheel motor 38, and the driving wheel motor 38 is electrically connected to the aforementioned electrical controller.

[0022] By Figure 1As shown, a backrest angle adjustment mechanism 212 is provided on the aforementioned backrest frame 21. The backrest angle adjustment mechanism 212 is composed of a push cylinder drive motor 2121, a push cylinder drive reduction gearbox 2122, a push cylinder 2123, and a headrest hinge seat 2124. The push cylinder drive motor 2121 is electrically connected to the aforementioned electrical controller. The push cylinder drive motor 2121 is in transmission cooperation with the push cylinder drive reduction gearbox 2122, and the push cylinder drive reduction gearbox 2122 together with the push cylinder drive motor 2121 is arranged on the hinge seat connecting pipe 7. Both ends of the hinge seat connecting pipe 7 ( Figure 1 the front end and the rear end in the position state shown) are respectively fixed to the hinge seats 71. And a pair of hinge seats 71 are respectively fixed to the right ends of the front and rear longitudinal beams 11 and 12 of the seat through the hinge seat fixing plates 711. The push cylinder 2123 is in cooperation with the push cylinder drive reduction gearbox 2122. The upper end (also referred to as the "end") of the push cylinder column 21231 of the push cylinder 2123 is hinged to the headrest hinge seat 2124.

[0023] In Figure 1 it also shows a headrest 8. The headrest 8 is connected to the headrest hinge seat 2124 through a jointed connecting arm 81.

[0024] In the present utility model, the aforementioned seat cushion 15 and the aforementioned backrest cushion 22 are sponge cushions.

[0025] In the present utility model, a manual operation controller 41 is provided at the left end of one of the pair of armrests 4 located at the rear side. The manual operation controller 41 is electrically controlled and connected to the aforementioned electrical controller.

[0026] In summary, the technical solution provided by the present utility model makes up for the deficiencies in the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. An adjustable footrest structure for an electric wheelchair, the electric wheelchair comprising a seat (1), a backrest (2), a traveling mechanism (3) and a pair of armrests (4). The seat (1) includes a front longitudinal beam (11) of the seat, a rear longitudinal beam (12) of the seat, a left cross beam (13) of the seat, a right cross beam (14) of the seat and a seat cushion (15). The front and rear longitudinal beams (11, 12) of the seat are parallel to each other in the front-rear direction in the length direction. The left cross beam (13) of the seat is connected between the opposite sides of the left ends of the front and rear longitudinal beams (11, 12) of the seat. The right cross beam (14) of the seat is connected between the opposite sides of the right ends of the front and rear longitudinal beams (11, 12) of the seat. The seat cushion (15) is fixedly laid on the upper sides of the front and rear seat beams (11, 12), the left cross beam (13) of the seat and the right cross beam (14) of the seat. The backrest (2) includes a backrest frame (21) and a back cushion (22). The shape of the backrest frame (21) is in an inverted U shape and the lower end is hinged to the right ends of the front longitudinal beam (11) of the seat and the rear longitudinal beam (12) of the seat. The back cushion (22) is fixedly laid on the left side of the backrest frame (21). The traveling mechanism (3) includes a front wall panel (31), a rear wall panel (32), a first front wheel (33), a second front wheel (34), a first drive wheel (35) and a second drive wheel (36). The front wall panel (31) is fixed to the front longitudinal beam (11) of the seat. The rear wall panel (32) is fixed to the rear longitudinal beam (12) of the seat. The first front wheel (33) is rotatably arranged at the left end of the front wall panel (31) through a first front wheel seat (331). The first drive wheel (35) is rotatably arranged at the right end of the front wall panel (31). The second front wheel is rotatably arranged at the left end of the rear wall panel (32) through a second front wheel seat (341). The second drive wheel (36) is rotatably arranged at the right end of the rear wall panel (32). One of the pair of armrests (4) located in the front is hinged between the right end of the front longitudinal beam (11) of the seat and the front side of the backrest frame (21), and one of the pair of armrests (4) located in the rear is hinged between the right end of the rear longitudinal beam (12) of the seat and the rear side of the backrest frame (21). The footrest structure includes a front footrest (5a), a front footrest hinge arm (5b), a front footrest hinge arm fixing bracket (5c), a rear footrest (6a), a rear footrest hinge arm (6b) and a rear footrest hinge arm fixing bracket (6c). The front footrest (5a) is hinged to the lower end of the front footrest hinge arm (5b). The front footrest hinge arm fixing bracket (5c) is fixed to the upper end of the front footrest hinge arm (5b), and the front footrest hinge arm fixing bracket (5c) is connected to the left end of the front longitudinal beam (11) of the seat. The rear footrest (6a) is hinged to the lower end of the rear footrest hinge arm (6b). The rear footrest hinge arm fixing bracket (6c) is fixed to the upper end of the rear footrest hinge arm (6b), and the rear footrest hinge arm fixing bracket (6c) is connected to the left end of the rear longitudinal beam (12) of the seat. It is characterized in that: The front longitudinal beam (11) of the seat is a rectangular tube with a hollow cavity (111) formed therein. The rear longitudinal beam (12) of the seat is a rectangular tube with a hollow cavity (121) formed therein. On the right side of the front footrest hinge arm fixing bracket (5c) and at a position corresponding to the hollow cavity (111) of the front longitudinal beam, a front footrest hinge arm fixing bracket adjusting rod (5d) is fixed horizontally. The front footrest hinge arm fixing bracket adjusting rod (5d) is slidably engaged with the hollow cavity (111) of the front longitudinal beam for left - right adjustment and is locked by a front locking screw knob (112) screwed on the front side of the left end of the front longitudinal beam of the seat. On the right end of the rear footrest hinge arm fixing bracket (6c) and at a position corresponding to the hollow cavity (121) of the rear longitudinal beam, a rear footrest hinge arm fixing bracket adjusting rod (6d) is fixed horizontally. The rear footrest hinge arm fixing bracket adjusting rod (6d) is slidably engaged with the hollow cavity (121) of the rear longitudinal beam for left - right adjustment and is locked by a rear locking screw knob (122) screwed on the rear side of the left end of the rear longitudinal beam (12) of the seat.

2. The adjustable footrest structure of the electric wheelchair according to claim 1, wherein: A left wallboard support connecting pipe (37a) is fixed between the opposite sides of the left ends of the front wallboard (31) and the rear wallboard (32), and a right wallboard support connecting pipe (37b) is fixed between the opposite sides of the right ends of the front wallboard (31) and the rear wallboard (32).

3. The adjustable footrest structure of the electric wheelchair according to claim 1, characterized in that: The lower end of the chair back frame (21) is hinged to the opposite sides of the right ends of the front longitudinal beam (11) of the seat and the rear longitudinal beam (12) of the seat through a chair back frame hinge seat (211).

4. The adjustable footrest structure of the electric wheelchair according to claim 1, characterized in that: A battery rack (16) is connected between the opposite sides of the front longitudinal beam (11) and the rear longitudinal beam (12) of the seat. A set of batteries (161) is provided on the battery rack (16). The number of the set of batteries (161) is three and they are electrically connected to an electrical controller provided below the right end of the seat (1). The first drive wheel (35) and the second drive wheel (36) are each driven by a drive wheel motor (38), and the drive wheel motor (38) is electrically connected to the electrical controller.

5. The adjustable footrest structure of the electric wheelchair according to claim 1, wherein: A chair back angle adjusting mechanism (212) is provided on the chair back frame (21).

6. The adjustable footrest structure of the electric wheelchair according to claim 1, wherein: The seat cushion (15) and the back cushion (22) are sponge cushions.

7. The adjustable footrest structure of the electric wheelchair according to claim 4, wherein: A manual operation controller (41) is provided at the left end of one of the pair of armrests (4) located at the rear side, and the manual operation controller (41) is electrically controlled and connected to the electrical controller.

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