Manual wheelchair with foldable backrest

Abstract

The invention relates to the technical field of wheelchairs, in particular to a manual wheelchair with a foldable backrest, which comprises a wheelchair framework assembly, the wheelchair framework assembly comprises a front framework body, a middle framework body and a rear framework body, the front framework body is a two-section concave, the front framework body is fixedly connected with the middle framework body, and the rear framework body is fixedly connected with the middle framework body. A rotating shaft piece is arranged between the middle framework body and the rear framework body, and the middle framework body and the rear framework body are rotationally connected through the rotating shaft piece. Rapid folding and compact storage are achieved through cooperation of the rotating shaft piece and the locking piece, the portability is greatly improved, the two-section type inwards-concave front framework body reserves a sufficient activity space for the shanks, the convenience and comfort of getting on and off a vehicle are remarkably improved, the height-adjustable foot treading frame is suitable for different user leg lengths, and the riding experience is improved; the center of gravity of the whole wheelchair can be adjusted by transversely moving the axle frame, linkage adjustment is achieved through cooperation with the side protection plates, use stability and safety are effectively enhanced, and the wheelchair is an innovative wheelchair design integrating portability, comfort and self-adaptive adjustment.

Description

Technical Field

[0001] This invention relates to the field of wheelchair technology, specifically to a manual wheelchair with a foldable backrest. Background Technology

[0002] As an important means of transportation for people with mobility impairments, the rationality of wheelchair design directly affects the user's quality of life and autonomy. Currently, the commonly available manual wheelchairs still have many areas for improvement in terms of structure, function, and user experience.

[0003] Firstly, in terms of portability and storage, although many wheelchairs are designed with folding functions, the common folding methods often only allow for a simple folding of the frame. The folded structure is still not compact enough and takes up a lot of space. This causes great inconvenience for users with limited home space or who need to frequently put their wheelchairs in the trunk of their cars for transportation. Users urgently need a solution with higher folding efficiency and smaller storage volume.

[0004] Secondly, in terms of ergonomic design, the front frame of existing wheelchairs mostly adopts a straight or slightly curved integral tube structure. When users get on and off the wheelchair, their lower legs are prone to interference and collision with the front frame, which not only hinders their movements but also poses a risk of bumps and injuries, bringing additional trouble and insecurity to users, especially those with limited leg mobility.

[0005] Finally, in terms of safety and stability, the rear axle position of traditional wheelchairs is usually fixed. This means that the center of gravity of the entire chair cannot be adaptively adjusted according to the different weight distribution and riding habits of the user. When the user is heavy or has a habit of having their center of gravity at the back, there may be a risk of tipping backward. On the other hand, if the center of gravity is too far forward, it may affect the steering flexibility of the front wheels. This fixed center of gravity design makes it difficult for the stability and safety of the wheelchair to reach the optimal state, and it cannot flexibly adapt to diverse usage scenarios and user groups. Summary of the Invention

[0006] In order to overcome the above-mentioned technical problems, the present invention aims to provide a manual wheelchair with a foldable backrest, so as to solve the problems of poor folding effect and poor comfort of existing folding wheelchairs mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A manually operated wheelchair with a foldable backrest, comprising: A wheelchair frame assembly, comprising a front frame, a middle frame, and a rear frame. The front frame is a two-section concave structure. The front frame and the middle frame are fixedly connected. A pivot is provided between the middle frame and the rear frame, and the middle frame and the rear frame are rotatably connected via the pivot. The bottom of the front frame is equipped with a footrest, and the footrest is adjustablely connected to the front frame. The bottom of the central frame is equipped with a triangular head connector and a wheel axle bracket. The wheel axle bracket is detachably mounted with a wheel hub. The wheel axle bracket is adjustablely connected to the central frame. The wheel axle bracket can be adjusted and moved on the central frame to adjust the position of the wheel hub. The middle frame is equipped with a side protection plate assembly, and the side of the rear frame is connected to a locking member. The side protection plate assembly is provided with a folding slide groove corresponding to the locking member, and the side protection plate assembly is provided with a center of gravity adjustment member for use in adjusting the position of the wheel axle frame.

[0008] Preferably, the position of the wheel hub component of the wheel axle frame is used to adjust the overall center of gravity of the wheelchair.

[0009] Preferably, the side protection panel assembly includes two side panel pieces.

[0010] Preferably, the first side panel is fixedly connected to the central frame, and the second side panel is movably installed with the first side panel via a center of gravity adjustment component.

[0011] Preferably, the relative positions of the first side plate and the second side plate are adjusted to cooperate with the center adjustment of the wheel axle frame.

[0012] Preferably, the foot pedal and the front frame are adjustable to adjust the height of the foot pedal, and the front frame has a flat elliptical cross-section.

[0013] Preferably, a wheelchair seat cushion is installed on the central frame, and braking mechanisms for deceleration wheel hubs are installed on both sides of the central frame.

[0014] Preferably, a wheelchair backrest is installed on the side of the rear frame, and a handle is connected to the end of the rear frame away from the pivot.

[0015] Preferably, the handles connected to the rear frame are bolted together, and the height of the handles mounted on the rear frame can be adjusted by bolting.

[0016] Preferably, the center of gravity adjustment component is provided in two sets, and the two sets of center of gravity adjustment components are distributed above and to the side of the side protection plate assembly.

[0017] Compared with the prior art, the beneficial effects of the present invention are: By using the combination of pivot and locking components, the wheelchair backrest and rear frame can be quickly folded. After folding, the overall structure is compact and the volume is significantly reduced, which greatly facilitates daily storage, vehicle transportation and home storage, and solves the pain point of traditional wheelchairs taking up too much space. The front frame adopts a two-section concave structure, providing ample space for the user's lower legs to move left and right. This design effectively avoids interference between the lower legs and the front frame when getting on and off the wheelchair or adjusting the sitting posture, making the movement more free and significantly improving the comfort and convenience of use. The footrest features an adjustable height design and a diagonal locking mechanism to flexibly adapt to the leg length differences and sitting habits of different users. Users can easily adjust it to the most comfortable and health-friendly position, thereby expanding the range of people who can use the wheelchair and improving the experience of sitting for long periods of time. The wheel axle frame can be adjusted laterally along the central frame, thereby changing the position of the rear wheels to adjust the center of gravity of the entire chair. This function allows the wheelchair to adapt to the weight distribution and operating habits of different users, effectively enhancing the stability and safety of the wheelchair in different usage scenarios. At the same time, the linkage adjustment of the side guard plate assembly ensures that the lateral support always matches the changes in the center of gravity. Attached Figure Description

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall bottom structure of the present invention; Figure 3 This is a schematic diagram of the overall side view of the present invention; Figure 4 This is a schematic diagram of the overall back structure of the present invention; Figure 5 This is a schematic diagram of the overall folded two-dimensional structure of the present invention.

[0019] In the diagram: 1. Wheelchair frame assembly; 11. Front frame; 12. Middle frame; 13. Rear frame; 14. Rotary pivot; 15. Triangular head connector; 16. Wheel axle frame; 2. Wheelchair seat; 3. Wheelchair backrest; 4. Wheel hub; 5. Footrest; 6. Side guard plate assembly; 61. Locking device; 62. Folding slide; 63. Center of gravity adjustment device. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] One embodiment provided by the present invention: A manually operated wheelchair with a foldable backrest, comprising: refer to Figures 1-2 Wheelchair frame assembly 1, the wheelchair frame assembly 1 includes a front frame body 11, a middle frame body 12 and a rear frame body 13, the front frame body 11 is a two-section concave, the front frame body 11 and the middle frame body 12 are fixedly connected, a pivot 14 is provided between the middle frame body 12 and the rear frame body 13, the middle frame body 12 and the rear frame body 13 are rotatably connected through the pivot 14; refer to Figure 2 The bottom of the front frame 11 is provided with a footrest 5, and the footrest 5 is adjustablely connected to the front frame 11. The bottom of the central frame 12 is equipped with a triangular head connector 15 and a wheel axle frame 16. The wheel axle frame 16 is detachably equipped with a wheel hub 4. The wheel axle frame 16 is adjustablely connected to the central frame 12. The wheel axle frame 16 can be adjusted and moved on the central frame 12 to adjust the position of the wheel hub 4.

[0022] It should be noted that in the prior art, the bottom of the wheelchair main frame is usually connected to the front of the wheelchair through a long connector. This structure has the disadvantages of being large in size and heavy in weight, which is not conducive to practical use. In contrast, the triangular front connector 15 used in this application is a compact structure that is directly installed at the bottom of the central frame 12. It has the advantages of being small in size and light in weight, which effectively reduces the structural load and space occupation of the overall wheelchair and improves the portability and practicality of the product.

[0023] refer to Figures 3-5 The middle frame 12 is equipped with a side protection plate assembly 6, and the side of the rear frame 13 is connected with a locking member 61. The side protection plate assembly 6 is provided with a folding slide groove 62 corresponding to the locking member 61. The side protection plate assembly 6 is provided with a center of gravity adjustment member 63 for use in adjusting the position of the wheel axle frame 16.

[0024] The position of the wheel hub component 4 is adjusted by the wheel axle frame 16 to adjust the overall center of gravity of the wheelchair.

[0025] It should be noted that the wheel axle bracket 16 is locked to the central frame body 12 by bolts. When adjusting the position of the wheel axle bracket 16, the position of the wheel axle bracket 16 can be moved directly after loosening the bolts. After adjusting to the appropriate position, the position of the wheel axle bracket 16 can be locked by tightening the bolts.

[0026] The side protection plate assembly 6 includes two side plate components.

[0027] It should be noted that the position adjustment of the two side panels is mainly to adapt to the center of gravity adjustment and improve the adjustability of the wheelchair.

[0028] The first side panel is fixedly connected to the central frame 12, and the second side panel is movably installed with the first side panel via a center of gravity adjustment component 63.

[0029] The relative positions of the first and second side plates are adjusted to cooperate with the center adjustment of the wheel axle frame 16.

[0030] The footrest 5 and the front frame 11 are adjustablely connected to adjust the height of the footrest 5.

[0031] It should be noted that some of the rods on both sides of the footrest 5 are inserted into the front frame 11, and a locking mechanism is provided between the front frame 11 and the footrest 5 to lock the device. After adjusting to the appropriate position, it can be locked directly.

[0032] The front frame 11 has a flat elliptical cross-section. This design allows its two curved surfaces to fit more closely and comfortably to the outer contour of the user's legs, which is in line with ergonomic principles. This not only effectively improves comfort during use, but also helps to distribute leg pressure and enhance the user's sense of support and stability.

[0033] A wheelchair seat cushion 2 is installed on the central frame 12, and a braking mechanism for the deceleration hub 4 is installed on both sides of the central frame 12.

[0034] A wheelchair backrest 3 is installed on the side of the rear frame 13, and a handle is connected to the end of the rear frame 13 away from the pivot 14.

[0035] The handles connected to the rear frame 13 are bolted together, and the height of the handles mounted on the rear frame 13 can be adjusted by bolting.

[0036] The center of gravity adjustment component 63 is provided in two sets, and the two sets of center of gravity adjustment components 63 are distributed above and to the side of the side protection plate assembly 6.

[0037] It should be noted that the wheelchair frame assembly 1 and the main load-bearing components are preferably made of one of titanium alloy, aluminum alloy or carbon fiber composite materials. While ensuring structural strength, this material can significantly reduce the overall weight, improve portability and flexibility of use, and all of the above materials can meet the structural and functional requirements of the wheelchair described in this application.

[0038] Working principle: When the wheelchair needs to be folded, first remove the detachable rear wheels from the wheel axle frame 16 to reduce structural obstruction during folding. Then, release the locking state of the side locking piece 61 of the rear frame 13, so that the locking piece 61 is disengaged from the folding slide 62 of the side guard plate assembly 6. At this time, the rear frame 13 can rotate around the pivot 14 connected to the middle frame 12. As the rear frame 13 rotates, the overall structure of the wheelchair will gradually transition from the unfolded state to the folded state, greatly reducing the overall size of the wheelchair and making it easier to store, transport and fold. After folding, readjust the locking piece 61 so that it engages with the folding slide 62 again to lock the position of the rear frame 13 and prevent accidental unfolding during use or handling.

[0039] The wheel axle frame 16, which is movably installed at the bottom of the central frame 12, can be adjusted laterally along the central frame 12. When the wheel axle frame 16 moves, it will drive the rear wheels of the wheelchair mounted on it to change position synchronously. The change in the position of the rear wheels will directly adjust the center of gravity of the entire wheelchair, thereby adapting to the weight, sitting posture and other usage habits of different users and improving the stability of use. While the wheel axle frame 16 is adjusting its position, the relative position of the two side plates included in the side guard plate assembly 6 can be adjusted by the center of gravity adjustment component 63 on the side guard plate assembly 6. This ensures that the side guard plate assembly 6 can always adapt to the changes in the center of gravity of the wheelchair, and avoid the side guard plate from obstructing the user's activities or losing its protective effect due to the shift in the center of gravity.

[0040] Furthermore, the front frame 11 of the wheelchair features a double-recessed structure design. In actual use, this structure provides ample space for the user's lower legs, allowing for free movement and preventing obstruction when placing or removing the legs from the footrest 5. This effectively improves ease of use. The footrest 5 is locked to the front frame 11 via a diagonal pull structure. To adjust the height of the footrest 5, simply release the diagonal pull structure, allowing the footrest 5 to move along a preset trajectory on the front frame 11. As the footrest 5 moves, it changes its extension from the front frame 11, thus adjusting its height. This design adapts to user leg length differences or different sitting postures, enhancing the wheelchair's usability and user comfort. Once the desired height is achieved, the footrest 5 is locked again via the diagonal pull structure to ensure stability and prevent wobbling during use.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A manually operated wheelchair with a foldable backrest, characterized in that, include: A wheelchair frame assembly, comprising a front frame, a middle frame, and a rear frame. The front frame is a two-section concave structure. The front frame and the middle frame are fixedly connected. A pivot is provided between the middle frame and the rear frame, and the middle frame and the rear frame are rotatably connected via the pivot. The bottom of the front frame is equipped with a footrest, and the footrest is adjustablely connected to the front frame. The bottom of the central frame is equipped with a triangular head connector and a wheel axle bracket. The wheel axle bracket is detachably mounted with a wheel hub. The wheel axle bracket is adjustablely connected to the central frame. The wheel axle bracket can be adjusted and moved on the central frame to adjust the position of the wheel hub. The middle frame is equipped with a side protection plate assembly, and the side of the rear frame is connected to a locking member. The side protection plate assembly is provided with a folding slide groove corresponding to the locking member, and the side protection plate assembly is provided with a center of gravity adjustment member for use in adjusting the position of the wheel axle frame.

2. The manual wheelchair with a foldable backrest according to claim 1, characterized in that: The position of the wheel hub component on the wheel axle frame is used to adjust the overall center of gravity of the wheelchair.

3. A manually operated wheelchair with a foldable backrest according to claim 1, characterized in that: The side protection plate assembly includes two side plate components.

4. A manually operated wheelchair with a foldable backrest according to claim 3, characterized in that: The first side panel is fixedly connected to the central frame, and the second side panel is movably installed with the first side panel via a center of gravity adjustment component.

5. A manually operated wheelchair with a foldable backrest according to claim 4, characterized in that: The relative positions of the first and second side plates are adjusted to cooperate with the center adjustment of the wheel axle frame.

6. A manually operated wheelchair with a foldable backrest according to claim 1, characterized in that: The foot pedal and the front frame are adjustable to adjust the height of the foot pedal, and the front frame has a flat elliptical cross-section.

7. A manually operated wheelchair with a foldable backrest according to claim 1, characterized in that: A wheelchair seat cushion is installed on the central frame, and braking mechanisms for deceleration wheel hubs are installed on both sides of the central frame.

8. A manually operated wheelchair with a foldable backrest according to claim 1, characterized in that: A wheelchair backrest is installed on the side of the rear frame, and a handle is connected to the end of the rear frame away from the pivot.

9. A manually operated wheelchair with a foldable backrest according to claim 8, characterized in that: The handles connected to the rear frame are bolted together, and the height of the handles mounted on the rear frame can be adjusted by bolting.

10. A manually operated wheelchair with a foldable backrest according to claim 1, characterized in that: The center of gravity adjustment component is provided in two sets, and the two sets of center of gravity adjustment components are distributed above and to the side of the side protection plate assembly.

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