A linkage mechanism for an electric folding wheelchair and an electric folding wheelchair

Abstract

The utility model provides a kind of electric folding wheelchair anti-tilt wheel linkage mechanism and electric folding wheelchair, it includes: including main frame, rear frame, first support, wheel hub motor, second support and anti-tilt wheel. Rear frame is rotatably connected by locking screw with main frame, rear frame end is equipped with connecting shaft, connecting shaft sleeve has rotatable shaft sleeve and is equipped with first threaded section;First support one end has recess and through-hole, through-hole sleeve connects shaft, recess sleeve shaft sleeve, and first support is connected by first fastener with first threaded section and realizes axial fixation. Wheel hub motor is installed in main frame end, and it is equipped with step shaft with second threaded section thereon;Second support one end has connecting hole sleeve step shaft, and axial fixation is realized by being connected with second threaded section through second fastener. Anti-tilt wheel rotation axis connects the other end of first and second support. The mechanism structure is simple, convenient to operate, and folds smoothly.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to an anti-tilt wheel linkage mechanism for an electric folding wheelchair and an electric folding wheelchair. Background Technology

[0002] Wheelchairs are a means of transportation for special groups such as the disabled, the elderly and frail, and patients undergoing clinical rehabilitation. In particular, for patients who are unable to walk independently, wheelchairs are often used as a substitute for walking, which enables patients to receive better treatment and rehabilitation and facilitates their daily lives.

[0003] In the field of electric wheelchairs, anti-tilt wheel assemblies are key components ensuring driving stability, while folding functionality affects product convenience and space utilization; therefore, compatibility between the two is crucial. Currently, most electric wheelchair anti-tilt wheel assemblies have a fixed installation structure, which easily creates spatial obstruction when folded, resulting in a large and inconvenient size after folding. Some foldable anti-tilt wheel assemblies require independent manual operation, which is cumbersome, and as the wheelchair is used for a long time, problems such as rotation jamming and structural loosening are prone to occur, making it difficult to achieve smooth and synchronized storage, which urgently needs improvement. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the aforementioned technologies. Therefore, one objective of this utility model is to provide an anti-tilt wheel linkage mechanism for an electric folding wheelchair, which has a simple structure, is easy to operate, and folds smoothly.

[0005] To achieve the above objectives, this utility model proposes an anti-tilt wheel linkage mechanism for an electric folding wheelchair, comprising: Main frame; The rear frame is rotatably connected to the main frame via a locking screw. The rear frame has a connecting shaft at its end, and a rotatable bushing is fitted on the connecting shaft. The free end of the connecting shaft extends out of the bushing, and the connecting shaft has a first threaded section. The first bracket has a groove and a through hole communicating with the groove at one end. The through hole is rotatably sleeved on the connecting shaft, and the groove is sleeved on the bushing. The free end of the connecting shaft extends out of the through hole. The first bracket is axially fixed to the connecting shaft by a first fastener threaded to the first threaded section. A hub motor is mounted at the end of the main frame. The hub motor has a stepped shaft with a second threaded section. The second bracket has a connecting hole at one end, which is rotatably fitted onto the stepped shaft. The free end of the stepped shaft extends out of the connecting hole. The second bracket is axially fixed to the stepped shaft by a second fastener threadedly connected to the second threaded section. An anti-roll wheel, the shaft of which is connected to the other end of the first bracket and the second bracket.

[0006] According to the present invention, an anti-tilt wheel linkage mechanism for an electric folding wheelchair is proposed. The main frame and rear frame are rotatably connected via a locking screw. The rear frame and the first support are relative to each other via a stepped engagement of a connecting shaft and a bushing. The first support and the connecting shaft are axially fixed via a threaded connection. The second support and the hub motor are relative to each other via a stepped shaft, and the second support and the stepped shaft are axially fixed via a threaded connection. The first and second supports are relative to each other via the anti-tilt wheel's rotating shaft. This anti-tilt wheel linkage mechanism for an electric folding wheelchair has a simple structure, is easy to operate, and folds smoothly.

[0007] In addition, the anti-tilt wheel linkage mechanism for an electric folding wheelchair according to the above embodiments of this utility model may also have the following additional technical features: Optionally, the connecting shaft is provided with a first axial hole, and the first threaded section is provided in the first axial hole.

[0008] Optionally, the stepped shaft is provided with a second axial hole, and the second threaded section is provided in the second axial hole.

[0009] Optionally, the connecting shaft of the rear frame is a fixed shaft that is pre-embedded in the carbon fiber rear frame and integrally formed, or it is fixedly connected to the rear frame by gluing.

[0010] Optionally, the stepped shaft is disposed on one side of the top of the hub motor.

[0011] Furthermore, the first support is S-shaped and the second support is arc-shaped. When the wheelchair is in use, the portions of the first and second supports extending out of the rear wheels overlap left and right, and the portions of the first and second supports extending out of the rear wheels are both bent upwards.

[0012] Optionally, the end of the main frame is provided with a first mounting surface, and the hub motor is provided with a second mounting surface. The first mounting surface and the second mounting surface are locked together by screws.

[0013] Another objective of this invention is to provide an electric folding wheelchair, which includes any of the aforementioned electric folding wheelchair anti-tilt wheel linkage mechanisms. Attached Figure Description

[0014] Figure 1 This is a structural diagram illustrating the use state of the electric folding wheelchair according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of point A; Figure 3 This is a schematic diagram illustrating the connection between the first bracket and the rear frame according to an embodiment of the present invention. Figure 4 This is a schematic diagram showing the connection between the second bracket and the hub motor according to an embodiment of the present invention. Figure 5 This is a structural schematic diagram of the electric folding wheelchair in its folded state according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: Main frame 1, rear frame 2, connecting shaft 21, first axial hole 211, bushing 22, locking screw 3, first bracket 4, groove 41, through hole 42, first fastener 5, hub motor 6, stepped shaft 61, second axial hole 611, second bracket 7, connecting hole 71, second fastener 8, anti-roll wheel 9, pan head gasket 10, backrest 20, armrest 30, control handle 301, seat cushion 40, front frame 50, support plate 501, battery 60. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0016] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0018] The following is for reference. Figure 1-5 The implementation of the anti-tilt wheel linkage mechanism for the electric folding wheelchair according to the embodiments of the present invention will be described in detail.

[0019] According to an embodiment of the present utility model, the anti-tilt wheelchair linkage mechanism includes: Main frame 1; The rear frame 2 is rotatably connected to the main frame 1 via a locking screw 3. The end of the rear frame 2 is provided with a connecting shaft 21, and a rotatable bushing 22 is fitted on the connecting shaft 21. The free end of the connecting shaft 21 extends out of the bushing 22, and the connecting shaft 21 is provided with a first threaded section. The first bracket 4 has a groove 41 and a through hole 42 communicating with the groove 41 at one end. The through hole 42 is rotatably sleeved on the connecting shaft 21, and the groove 41 is sleeved on the bushing 22. The free end of the connecting shaft 21 extends out of the through hole 42. The first bracket 4 is axially fixed to the connecting shaft 21 by threaded connection with the first threaded section through the first fastener 5. Hub motor 6 is mounted at the end of the main frame 1. Hub motor 6 is provided with a stepped shaft 61, and stepped shaft 61 is provided with a second threaded section. The second bracket 7 has a connecting hole 71 at one end, which is rotatably sleeved on the stepped shaft 61. The free end of the stepped shaft 61 extends out of the connecting hole 71. The second bracket 7 is axially fixed to the stepped shaft 61 by threaded connection between the second fastener 8 and the second threaded section. Anti-roll wheel 9, the shaft of anti-roll wheel 9 is connected to the other end of the first bracket 4 and the second bracket 7.

[0020] In other words, both the main frame 1 and the rear frame 2 are provided with horizontally arranged mounting holes. The locking screw 3 passes through two mounting holes and achieves a rotatable connection between the two, making assembly more convenient. The rear frame 2 has a connecting shaft 21 at its end, and a rotatable bushing 22 is fitted onto the connecting shaft 21. The bushing 22 forms a relatively fixed connection with the groove 41 of the first bracket 4, so that when the first bracket 4 and the rear frame 2 rotate relative to each other, relative rotational friction occurs between the bushing 22 and the connecting shaft 21, avoiding direct rotational friction between the first bracket 4 and the connecting shaft 21. The bushing 22 also increases the contact area with the connecting shaft 21, improving service life. At the same time, the bushing 22 can be directly replaced when it is damaged, as it is a wear part. The free end of the connecting shaft 21 extends out of the bushing 22, facilitating the first tightening. The fastener 5 is threadedly connected to the first threaded section, thereby restricting the first bracket 4 to the connecting shaft 21; the hub motor 6 is installed at the end of the main frame 1, and its stepped shaft 61 has a second threaded section. The connecting hole 71 of the second bracket 7 is rotatably fitted onto the stepped shaft 61. It is threadedly connected to the second threaded section through the second fastener 8, so as to achieve axial fixation while maintaining rotational flexibility; when the wheelchair needs to be folded, through the relative rotation of the main frame 1 and the rear frame 2, the end of the rear frame 2 swings towards the front wheel with the locking screw 3 as the pivot. The connecting shaft 21 on the rear frame 2 pulls the first bracket 4. The first bracket 4 pulls the second bracket 7 through the anti-roll wheel 9. The second bracket 7 swings with the stepped shaft 61 as the pivot. The anti-roll wheel 9 swings from bottom to top towards the front wheel with the stepped shaft 61 as the pivot to form a folding.

[0021] Among them, the locking screw 3 can be connected to the main frame 1 and the rear frame 2 at the end near the main frame 1 and the rear frame 2. The first threaded section and the second threaded section can be external threads or internal threads. When connecting, a nut or screw thread connection can be used, as long as the outer diameter of the nut or screw head is larger than the through hole 42 and the connecting hole 71. The groove 41 and the bushing 22 can be tightly fitted to facilitate the bushing 22 to rotate synchronously with the first bracket 4. Both the bushing 22 and the stepped shaft 61 can be made of materials with self-lubricating function, such as polytetrafluoroethylene and its composite materials, to improve the smoothness of rotation. The stepped shaft 61 can be threaded to the mounting hole of the hub motor 6.

[0022] Thus, the main frame 1 and the rear frame 2 are rotatably connected by the locking screw 3. The rear frame 2 and the first bracket 4 can rotate relative to each other through the stepped engagement of the connecting shaft 21 and the bushing 22. The first bracket 4 and the connecting shaft 21 are axially fixed by the threaded connection. The second bracket 7 and the hub motor 6 can rotate relative to each other through the stepped shaft 61. The second bracket 7 and the stepped shaft 61 are axially fixed by the threaded connection. The first bracket 4 and the second bracket 7 can rotate relative to each other through the rotating shaft of the anti-tilt wheel 9. This electric folding wheelchair anti-tilt wheel linkage mechanism has a simple structure, is easy to operate, and folds smoothly.

[0023] Optionally, the connecting shaft 21 is provided with a first axial hole 211, and a first threaded section is provided within the first axial hole 211. Understandably, by providing a thread within the first axial hole 211, the length of the connecting shaft 21 can be shortened, ensuring connection reliability while reducing the space occupied by the connecting shaft 21, resulting in a simpler overall appearance. A combination of screws and washers can be used for threaded connection with the first axial hole 211; the screws serve a locking function, and the washers serve a blocking and limiting function.

[0024] Optionally, the stepped shaft 61 is provided with a second axial hole 611, and a second threaded section is provided within the second axial hole 611. Understandably, by providing a thread within the second axial hole 611, the length of the stepped shaft 61 can be shortened, ensuring connection reliability while reducing the space occupied by the stepped shaft 61, resulting in a simpler overall appearance. A combination of screws and washers can be used for threaded connection with the second axial hole 611; the screws serve a locking function, and the washers serve a blocking and limiting function.

[0025] Optionally, the connecting shaft 21 of the rear frame 2 is a fixed shaft pre-embedded in the carbon fiber rear frame 2 and integrally formed, or it is fixedly connected to the rear frame 2 by gluing. Understandably, the carbon fiber rear frame 2 itself has the characteristics of lightweight and high strength. When the connecting shaft 21 is pre-embedded and integrally formed, it can form a stable whole with the rear frame 2, avoiding loosening caused by assembly gaps. When the gluing method is used, there is no need to drill holes in the frame and damage the structure. Both methods can ensure the connection strength while meeting the lightweight requirements of the wheelchair, ensuring that the connecting shaft 21 does not shift or fall off when folding.

[0026] Optionally, the stepped shaft 61 is located on one side of the top of the hub motor 6. Understandably, this position avoids the power output components of the hub motor 6 and the rear wheels of the wheelchair, preventing the stepped shaft 61 and the second bracket 7 from interfering with surrounding components when rotating; at the same time, after the second bracket 7 is connected to the anti-roll wheel 9, a reasonable force transmission path is formed, so that it can rotate smoothly with the relative movement of the main frame 1 and the hub motor 6 when folded, without jamming.

[0027] Furthermore, the first support 4 is S-shaped, and the second support 7 is an arc-shaped strip. When the wheelchair is in use, the portions of the first support 4 and the second support 7 extending beyond the rear wheels overlap left and right, and both portions of the first support 4 and the second support 7 curve upwards. Understandably, the S-shaped and arc-shaped designs improve aesthetics and enhance the support strength of the first support 4, making it less prone to deformation; the left-right overlap strengthens anti-tipping support and appears more visually concise; the upward curve allows the portion protruding from the rear wheels to transition more smoothly to the anti-tipping wheel 9, giving the curved portion a certain degree of anti-tipping effect, while also improving aesthetics. The middle portion of the first support 4 can be configured to match the contour of the hub motor 6 and overlap left and right, with the first support 4 angled downwards towards the rear of the rear wheels.

[0028] Optionally, the main frame 1 has a first mounting surface at its end, and the hub motor 6 has a second mounting surface. The first mounting surface and the second mounting surface are fastened together with screws. Understandably, this planar fit increases the contact area between the main frame 1 and the hub motor 6, improving connection stability; the screw fastening method is simple and reliable, facilitating assembly and subsequent maintenance. The second mounting surface faces the upper front of the wheelchair.

[0029] In addition, this utility model also proposes an electric folding wheelchair, which includes an anti-tilt wheel linkage mechanism. Understandably, by incorporating this anti-tilt wheel linkage mechanism into the electric folding wheelchair, the wheelchair and anti-tilt wheels can be folded and stored synchronously. The electric folding wheelchair includes a backrest, armrests, a seat cushion, a main frame, a front frame, a rear frame, and a battery. The armrests are rotatably connected to the backrest and seat cushion, the seat cushion is rotatably connected to the backrest, the bottom end of the backrest is rotatably connected to the rear frame, the front end of the main frame is rotatably connected to the seat cushion and the front frame, the front frame has front wheels and a foot support plate, the armrests have control handles, and the battery is located between the rear frame and the front frame.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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 utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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 an electrical 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mechanism for the anti-tilt wheel linkage of an electric folding wheelchair, characterized in that, include: Main frame; The rear frame is rotatably connected to the main frame via a locking screw. The rear frame has a connecting shaft at its end, and a rotatable bushing is fitted on the connecting shaft. The free end of the connecting shaft extends out of the bushing, and the connecting shaft has a first threaded section. The first bracket has a groove and a through hole communicating with the groove at one end. The through hole is rotatably sleeved on the connecting shaft, and the groove is sleeved on the bushing. The free end of the connecting shaft extends out of the through hole. The first bracket is axially fixed to the connecting shaft by a first fastener threaded to the first threaded section. A hub motor is mounted at the end of the main frame. The hub motor has a stepped shaft with a second threaded section. The second bracket has a connecting hole at one end, which is rotatably fitted onto the stepped shaft. The free end of the stepped shaft extends out of the connecting hole. The second bracket is axially fixed to the stepped shaft by a second fastener threadedly connected to the second threaded section. An anti-roll wheel, the shaft of which is connected to the other end of the first bracket and the second bracket.

2. The anti-tilt wheel linkage mechanism for an electric folding wheelchair as described in claim 1, characterized in that, The connecting shaft is provided with a first axial hole, and the first threaded section is provided in the first axial hole.

3. The anti-tilt wheel linkage mechanism for an electric folding wheelchair as described in claim 1, characterized in that, The stepped shaft is provided with a second axial hole, and the second threaded section is provided in the second axial hole.

4. The anti-tilt wheel linkage mechanism for an electric folding wheelchair as described in claim 1, characterized in that, The connecting shaft of the rear frame is a fixed shaft that is pre-embedded in the carbon fiber rear frame and integrally formed, or it is fixedly connected to the rear frame by gluing.

5. The anti-tilt wheel linkage mechanism for an electric folding wheelchair as described in claim 1, characterized in that, The stepped shaft is located on one side of the top of the hub motor.

6. The anti-tilt wheel linkage mechanism for an electric folding wheelchair as described in claim 5, characterized in that, The first support is S-shaped, and the second support is arc-shaped. When the wheelchair is in use, the portions of the first and second supports extending out of the rear wheels overlap left and right, and the portions of the first and second supports extending out of the rear wheels are both bent upwards.

7. The anti-tilt wheel linkage mechanism for an electric folding wheelchair as described in claim 1, characterized in that, The main frame has a first mounting surface at its end, and the hub motor has a second mounting surface. The first mounting surface and the second mounting surface are fastened together by screws.

8. An electric folding wheelchair, characterized in that, Includes the anti-tilt wheel linkage mechanism for electric folding wheelchairs as described in any one of claims 1-7.

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