Manual folding device for a wheelchair

Abstract

The utility model relates to a wheelchair technical field especially is involved in a manual folding device of wheelchair, including wheelchair seat cushion framework and wheelchair support framework, wheelchair seat cushion framework and wheelchair support framework rotation connection, wheelchair seat cushion framework is provided with the mounting seat, is provided with the first connecting shaft on the mounting seat, is provided with the crosspiece on the wheelchair support framework, is provided with the support piece on the crosspiece, the support piece end is provided with the positioning gap of opening upwards, the first connecting axle can be connected in the positioning gap, is provided with the second connecting axle on the support piece, the second connecting axle is rotationally connected with the limiting piece, one end of the limiting piece is provided with the mounting gap of opening downwards, the first connecting axle can be connected in the mounting gap, the other end fixed connection of the limiting piece has the push -rod, the support piece and the limiting piece jointly connect the elastic part, and the elastic part is used for driving the limiting piece to have the tendency of being close to the positioning gap, the utility model solves the problem that the folding mechanism locking of traditional folding type wheelchair is not stable enough.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, and in particular to a manual folding device for a wheelchair. Background Technology

[0002] Society is paying more and more attention to special groups such as people with disabilities and the elderly, and is placing greater emphasis on their welfare. Allowing them to engage in outdoor activities and relax can significantly improve their quality of life, and wheelchairs, as a means of transportation, are also receiving more attention.

[0003] Referencing application 202321393570.2, entitled "A Folding Mechanism for a Wheelchair," this wheelchair includes a backrest frame and a base frame. The backrest frame and base frame are connected by an L-shaped connecting piece, with one end hinged to the backrest frame and the other end hinged to the base frame. An L-shaped switch piece is hinged to the lower part of the backrest frame, with a slot at the other end. This design uses a front-to-back folding mechanism instead of the existing left-to-right folding structure, preserving the overall structural design of the seat and avoiding the need for a middle-folding design. Furthermore, it avoids the problem of strain caused by wheel friction during folding. When unfolded, a spring pulls the switch piece to automatically lock it onto a crossbar. However, this wheelchair folding mechanism is not stable enough in its locked state after unfolding. In some complex usage situations, the lock may be accidentally released, causing inconvenience and affecting the user experience. The market urgently needs a wheelchair with a more stable locking mechanism after folding. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes a manual folding device for wheelchairs, which solves the problem of insufficient locking stability in the folding mechanism of traditional folding wheelchairs.

[0005] The technical solution adopted by this utility model is as follows: a manual folding device for a wheelchair, including a wheelchair seat frame and a wheelchair support frame. A wheelchair backrest frame is connected to the wheelchair seat frame. The wheelchair seat frame and the wheelchair support frame are rotatably connected. The wheelchair seat frame is provided with a mounting base. A first connecting shaft is provided on the mounting base. A crossbar is provided on the wheelchair support frame. A support plate is provided on the crossbar. A positioning notch is provided at the end of the support plate. The opening of the positioning notch is upward. The first connecting shaft can be engaged in the positioning notch. A second connecting shaft is provided on the support plate. A limiting plate is rotatably connected to the second connecting shaft. One end of the limiting plate is provided with an installation notch. The opening of the installation notch is downward. The first connecting shaft can be engaged in the installation notch. A push rod is fixedly connected to the other end of the limiting plate. An elastic element is connected to both the support plate and the limiting plate. The elastic element is used to drive the limiting plate to tend to move closer to the positioning notch.

[0006] When the wheelchair support frame is in the unfolded state relative to the wheelchair seat frame, the first connecting shaft is engaged in the positioning notch, and the mounting notch is engaged on the first connecting shaft.

[0007] With the above technical solution, the user drives the wheelchair seat frame to rotate downward relative to the wheelchair support frame, causing the mounting seat to move closer to the support plate. After the first connecting shaft and the limiting plate come into contact, the first connecting shaft can push open the limiting plate under the action of the driving force, thus continuing to move until the first connecting shaft is engaged in the positioning notch. The mounting notch is engaged on the first connecting shaft, and the wheelchair seat frame and the wheelchair support frame are in a locked state. Then, the wheelchair support frame and the wheelchair seat frame are fully unfolded, and the wheelchair can be used. The user only needs to engage the mounting notch on the first connecting shaft, and the first connecting shaft is engaged in the positioning notch to complete the unfolding of the wheelchair. Both the upward-opening positioning notch and the downward-opening mounting notch are engaged on the first connecting shaft, making the folding device structure of the wheelchair simple and the connection stable, and making the locking state between the wheelchair seat frame and the wheelchair support frame very stable.

[0008] Furthermore, the limiting piece includes a vertical portion and a curved portion connected to each other, the connection between the vertical portion and the curved portion is rotatably connected to the second connecting shaft, and the mounting notch is located inside the curved portion.

[0009] Through the above technical solution, the connection between the vertical part and the curved part and the second connecting shaft makes the limiting piece more efficient when rotating on the second connecting shaft, and the limiting piece can better overlap on the first connecting shaft; the installation notch is located on the inside of the curved part, so that the limiting piece and the first connecting shaft are very firmly connected and prevented from falling off due to shaking.

[0010] Furthermore, the curved portion is provided with an inclined surface for withstanding the compression of the first connecting shaft.

[0011] With the above technical solution, when the user drives the first connecting shaft and the limiting piece to contact, the first connecting shaft can be more smoothly engaged in the positioning notch by the squeezing of the inclined surface, making it more convenient for the user to unfold the wheelchair seat frame and the wheelchair support frame.

[0012] Furthermore, the limiting piece is provided with a limiting protrusion; when the limiting piece rotates to the limit position, the limiting protrusion and the crossbar abut against each other.

[0013] Through the above technical solution, the setting of the limiting protrusion enables the limiting piece to maintain a tendency to move closer to the positioning notch, thus ensuring the realization of the function of the limiting piece.

[0014] Furthermore, the mounting base includes a mounting plate and an extension plate, and there are two extension plates. The two extension plates are respectively connected to both sides of the mounting plate. The extension plates are provided with first connecting holes, and the first connecting shaft is fixedly connected in the two first connecting holes.

[0015] Through the above technical solution, the first connecting shaft is fixedly connected in the two first connecting holes, making the connection between the first connecting shaft and the extension piece very stable, thereby making the overall load-bearing capacity of the first connecting shaft and the mounting base stronger.

[0016] Furthermore, the support plate has a second connecting hole, and the second connecting shaft is fixedly connected in the second connecting hole.

[0017] Through the above technical solution, the second connecting shaft is fixedly connected in the second connecting hole, making the connection between the second connecting shaft and the support plate very stable, thereby making the overall load-bearing capacity of the combination of the second connecting shaft and the support plate stronger.

[0018] Furthermore, there are two mounting seats on the wheelchair seat frame, four support plates on the crossbar, the support plates are arranged in pairs, two support plates are located between two extension plates, there are two limiting plates, and the push rod is fixedly connected between the two limiting plates.

[0019] With the above technical solution, the push rod is fixedly connected between the two limiting plates, making it very convenient for the user to drive the limiting plates to rotate using the push rod. The paired support plates can effectively disperse the pressure applied by the wheelchair seat frame, making the overall structure of the wheelchair very stable.

[0020] Furthermore, the elastic element is a double-body torsion spring, and the double-body torsion spring is provided with two coils. The two coils are respectively located on both sides of the limiting plate. The ends of the coils are provided with L-shaped rods, which are engaged with the support plate. A connecting part is provided between the two coils, and the connecting part abuts against the outer side of the bending part.

[0021] Through the above technical solution, the L-shaped rod on the double-body torsion spring is snapped onto the support plate, and the connecting part abuts against the outside of the bending part, making the connection of the double-body torsion spring very stable. The two coils are located on both sides of the limiting plate, which can better distribute the pressure on the double-body torsion spring and effectively extend the service life of the double-body torsion spring. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the wheelchair of this utility model in use.

[0024] Figure 2 This is an enlarged view of point A in the schematic diagram of the wheelchair of this utility model in use.

[0025] Figure 3 This is an exploded view of part of the structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the double-body torsion spring structure of this utility model;

[0027] Figure 5 This is a partial structural schematic diagram of the present invention;

[0028] Figure 6 This is a schematic diagram of the support sheet structure of this utility model;

[0029] Figure 7 This is a schematic diagram of the limiting piece structure of this utility model;

[0030] The utility model reference information is as follows:

[0031] 1. Wheelchair seat frame; 2. Wheelchair support frame; 3. Wheelchair backrest frame; 4. Mounting base; 401. Mounting plate; 402. Extension plate; 5. First connecting shaft; 6. Crossbar; 7. Support plate; 8. Positioning notch; 9. Second connecting shaft; 10. Limiting plate; 101. Vertical part; 102. Bending part; 11. Mounting notch; 12. Push rod; 13. Inclined surface; 14. Limiting protrusion; 15. First connecting hole; 16. Second connecting hole; 17. Double torsion spring; 18. Coil; 19. L-shaped rod; 20. Connecting part;

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0036] See Figures 1 to 7As shown, a manual folding device for a wheelchair includes a wheelchair seat frame 1 and a wheelchair support frame 2. A wheelchair backrest frame 3 is connected to the wheelchair seat frame 1. The wheelchair seat frame 1 and the wheelchair support frame 2 are rotatably connected. The wheelchair seat frame 1 is provided with a mounting base 4, and a first connecting shaft 5 is provided on the mounting base 4. The wheelchair support frame 2 is provided with a crossbar 6, and a support plate 7 is provided on the crossbar 6. A positioning notch 8 is provided at the end of the support plate 7, with the opening of the positioning notch 8 facing upward. The first connecting shaft 5 can be engaged in the positioning notch 8. A second connecting shaft 9 is provided on the support plate 7. A limiting piece 10 is rotatably connected to the second connecting shaft 9. One end of the limiting piece 10 is provided with an installation notch 11, with the opening of the installation notch 11 facing downwards. The first connecting shaft 5 can be engaged in the installation notch 11. The other end of the limiting piece 10 is fixedly connected to a push rod 12. The support piece 7 and the limiting piece 10 are connected together to an elastic element. The elastic element is used to drive the limiting piece 10 to tend to move closer to the positioning notch 8. When the wheelchair support frame 2 is in the unfolded state relative to the wheelchair seat frame 1, the first connecting shaft 5 is engaged in the positioning notch 8, and the installation notch 11 is engaged on the first connecting shaft 5. The user drives the wheelchair seat frame 1 to rotate downwards relative to the wheelchair support frame 2, causing the mounting base 4 to move closer to the support plate 7. After the first connecting shaft 5 and the limiting plate 10 come into contact, the first connecting shaft 5 can push open the limiting plate 10 under the action of the driving force, thus continuing to move until the first connecting shaft 5 is engaged in the positioning notch 8 and the mounting notch 11 is engaged on the first connecting shaft 5. The wheelchair seat frame 1 and the wheelchair support frame 2 are in a locked state, and then the wheelchair support frame 2 and the wheelchair seat frame 1 are fully unfolded, and the wheelchair can be used. The user only needs to engage the mounting notch 11 on the first connecting shaft 5 and the first connecting shaft 5 in the positioning notch 8 to complete the unfolding of the wheelchair. The positioning notch 8 with the opening facing upwards and the mounting notch 11 with the opening facing downwards are both engaged on the first connecting shaft 5, making the folding device structure of the wheelchair simple and the connection stable, and making the locking state between the wheelchair seat frame 1 and the wheelchair support frame 2 very stable.

[0037] See Figure 6 As shown, the upward opening of the positioning notch 8 means establishing an X-axis parallel to the ground and a Y-axis perpendicular to the ground, and establishing a coordinate system with the X-axis and Y-axis. If the positioning notch 8 on the support piece 7 is placed in this coordinate system, then the angle range of the opening of the positioning notch 8 is located in the first quadrant and the second quadrant, and the angle of the opening of the positioning notch 8 can be 90 degrees.

[0038] See Figure 7As shown, the downward opening of the mounting notch 11 means establishing an X-axis parallel to the ground and a Y-axis perpendicular to the ground, and establishing a coordinate system with the X-axis and Y-axis. The mounting notch 11 of the limiting piece 10 is placed in this coordinate system. Then, the angle range of the opening of the mounting notch 11 is located in the third quadrant and the fourth quadrant, and the angle of the opening of the mounting notch 11 can be 270 degrees.

[0039] See Figure 5 , 7 As shown, the limiting piece 10 includes a vertical portion 101 and a curved portion 102 connected to each other. The connection between the vertical portion 101 and the curved portion 102 is rotatably connected to the second connecting shaft 9, and the mounting notch 11 is located inside the curved portion 102. The rotatable connection between the connection between the vertical portion 101 and the curved portion 102 and the second connecting shaft 9 makes the limiting piece 10 more efficient when rotating on the second connecting shaft 9, and the limiting piece 10 can better overlap on the first connecting shaft 5; the mounting notch 11 being located inside the curved portion 102 makes the limiting piece 10 and the first connecting shaft 5 very firmly engaged, preventing it from coming off due to shaking.

[0040] See Figure 5 , 7 As shown, the curved portion 102 is provided with an inclined surface 13 for bearing the pressure of the first connecting shaft 5. When the user drives the first connecting shaft 5 to contact the limiting piece 10, the first connecting shaft 5 can be more smoothly engaged into the positioning notch 8 by the pressure of the inclined surface 13, making it more convenient for the user to unfold the wheelchair seat frame 1 and the wheelchair support frame 2.

[0041] See Figure 5 , 7 As shown, a limiting protrusion 14 is provided on the limiting piece 10; when the limiting piece 10 rotates to its limit position, the limiting protrusion 14 abuts against the crossbar 6. The setting of the limiting protrusion 14 allows the limiting piece 10 to maintain a tendency to move closer to the positioning notch 8, ensuring the realization of the function of the limiting piece 10.

[0042] See Figures 1-3 As shown, the mounting base 4 includes a mounting plate 401 and two extension plates 402. The two extension plates 402 are respectively connected to both sides of the mounting plate 401. Each extension plate 402 has a first connecting hole 15, and a first connecting shaft 5 is fixedly connected within the two first connecting holes 15. The fixed connection of the first connecting shaft 5 within the two first connecting holes 15 ensures a very stable connection between the first connecting shaft 5 and the extension plates 402, thereby increasing the overall load-bearing capacity of the combined first connecting shaft 5 and mounting base 4.

[0043] See Figure 3 , 6As shown, a second connecting hole 16 is provided on the support plate 7, and a second connecting shaft 9 is fixedly connected in the second connecting hole 16. The fixed connection of the second connecting shaft 9 in the second connecting hole 16 makes the connection between the second connecting shaft 9 and the support plate 7 very stable, thereby making the overall load-bearing capacity of the combination of the second connecting shaft 9 and the support plate 7 stronger.

[0044] See Figures 1-3 As shown, there are two mounting bases 4 on the wheelchair seat frame 1, four support plates 7 on the crossbar 6, and the support plates 7 are arranged in pairs, with two support plates 7 located between two extension plates 402. There are two limiting plates 10, and a push rod 12 is fixedly connected between the two limiting plates 10. The fixed connection of the push rod 12 between the two limiting plates 10 makes it very convenient for the user to drive the limiting plates 10 to rotate using the push rod 12. The paired support plates 7 can effectively distribute the pressure applied by the wheelchair seat frame 1, making the overall structure of the wheelchair very stable.

[0045] See Figures 4-5 As shown, the elastic element is a double-body torsion spring 17, with two coils 18 on each coil. The two coils 18 are located on opposite sides of the limiting plate 10. An L-shaped rod 19 is attached to the end of each coil 18, and the L-shaped rod 19 is engaged with the support plate 7. A connecting portion 20 is provided between the two coils 18, and the connecting portion 20 abuts against the outer side of the bent portion 102. The L-shaped rod 19 on the double-body torsion spring 17 engaging with the support plate 7, and the connecting portion 20 abutting against the outer side of the bent portion 102, ensures a very stable connection for the double-body torsion spring 17. Furthermore, the two coils 18 located on opposite sides of the limiting plate 10 better distribute the pressure on the double-body torsion spring 17, effectively extending its service life.

[0046] In use, the user drives the wheelchair seat frame 1 to rotate downwards relative to the wheelchair support frame 2, causing the mounting base 4 to move closer to the support plate 7. After the first connecting shaft 5 and the limiting plate 10 come into contact, the first connecting shaft 5 can press the inclined surface 13 on the limiting plate 10 under the action of the driving force, thus continuing to move until the first connecting shaft 5 is engaged in the positioning notch 8 and the mounting notch 11 is engaged on the first connecting shaft 5. The wheelchair seat frame 1 and the wheelchair support frame 2 are in a locked state, and the wheelchair support frame 2 and the wheelchair seat frame 1 are fully unfolded, and the wheelchair can be used. When the user needs to fold and store the wheelchair, the push rod 12 is lifted upwards, causing the mounting notch 11 and the first connecting shaft 5 to disengage. Then, the user drives the wheelchair seat frame 1 to rotate upwards relative to the wheelchair support frame 2 until the first connecting shaft 5 comes out of the positioning notch 8. The lock between the wheelchair seat frame 1 and the wheelchair support frame 2 is released, and the user can fold the wheelchair.

[0047] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A manually folding device for a wheelchair, comprising a wheelchair seat frame (1) and a wheelchair support frame (2), wherein a wheelchair backrest frame (3) is connected to the wheelchair seat frame (1), and the wheelchair seat frame (1) and the wheelchair support frame (2) are rotatably connected, characterized in that: The wheelchair seat frame (1) is provided with a mounting base (4), and a first connecting shaft (5) is provided on the mounting base (4). The wheelchair support frame (2) is provided with a crossbar (6), and a support plate (7) is provided on the crossbar (6). A positioning notch (8) is provided at the end of the support plate (7), and the opening of the positioning notch (8) faces upward. The first connecting shaft (5) can be engaged in the positioning notch (8). A second connecting shaft (9) is provided on the support plate (7). 9) A limiting piece (10) is rotatably connected to the upper part. One end of the limiting piece (10) is provided with an installation notch (11). The opening of the installation notch (11) is downward. The first connecting shaft (5) can be engaged in the installation notch (11). The other end of the limiting piece (10) is fixedly connected with a push rod (12). The support piece (7) and the limiting piece (10) are connected together with an elastic element. The elastic element is used to drive the limiting piece (10) to have a tendency to move closer to the positioning notch (8). When the wheelchair support frame (2) is in the unfolded state relative to the wheelchair seat frame (1), the first connecting shaft (5) is engaged in the positioning notch (8), and the mounting notch (11) is engaged on the first connecting shaft (5).

2. The manual folding device for a wheelchair according to claim 1, characterized in that: The limiting piece (10) includes a vertical part (101) and a curved part (102) connected to each other. The connection between the vertical part (101) and the curved part (102) is rotatably connected to the second connecting shaft (9). The mounting notch (11) is located inside the curved part (102).

3. The manual folding device for a wheelchair according to claim 2, characterized in that: The curved portion (102) is provided with an inclined surface (13) for bearing the pressure of the first connecting shaft (5).

4. The manual folding device for a wheelchair according to claim 3, characterized in that: The limiting piece (10) is provided with a limiting protrusion (14); when the limiting piece (10) rotates to the limit position, the limiting protrusion (14) and the crossbar (6) abut against each other.

5. A manual folding device for a wheelchair according to claim 2, 3, or 4, characterized in that: The mounting base (4) includes a mounting plate (401) and an extension plate (402). There are two extension plates (402), which are respectively connected to both sides of the mounting plate (401). The extension plate (402) is provided with a first connecting hole (15), and the first connecting shaft (5) is fixedly connected in the two first connecting holes (15).

6. A manual folding device for a wheelchair according to claim 5, characterized in that: The support plate (7) has a second connecting hole (16), and the second connecting shaft (9) is fixedly connected in the second connecting hole (16).

7. A manual folding device for a wheelchair according to claim 6, characterized in that: There are two mounting bases (4) on the wheelchair seat frame (1), four support plates (7) on the crossbar (6), the support plates (7) are arranged in pairs, the two support plates (7) are located between the two extension plates (402), there are two limiting plates (10), and the push rod (12) is fixedly connected between the two limiting plates (10).

8. A manual folding device for a wheelchair according to claim 7, characterized in that: The elastic element is a double-body torsion spring (17), and a coil (18) is provided on the double-body torsion spring (17). There are two coils (18) on the double-body torsion spring (17). The two coils (18) are located on both sides of the limiting plate (10). An L-shaped rod (19) is provided at the end of the coil (18). The L-shaped rod (19) is engaged with the support plate (7). A connecting part (20) is provided between the two coils (18). The connecting part (20) abuts against the outer side of the bent part (102).

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