Folding structure of a wheelchair

Abstract

This utility model belongs to the field of wheelchair technology, and specifically relates to a folding structure for a wheelchair, including a seat plate, a backrest frame rotatably mounted on the rear side of the seat plate, and a front wheel frame rotatably mounted below the seat plate. A transmission link is provided between the front wheel frame and the backrest frame, and the transmission link is rotatably connected to both the front wheel frame and the backrest frame. The backrest frame, seat plate, front wheel frame, and transmission link are combined to form a four-bar linkage. A support surface is provided on the front wheel frame, and when the wheelchair is unfolded, the support surface abuts against the seat plate. A limiting member is movably mounted on the seat plate, and a limiting block adapted to the limiting member is provided on the front wheel frame. The limiting member and the limiting block cooperate to restrict the relative rotation of the seat plate and the front wheel frame, and keep the wheelchair in the unfolded state. The purpose of this utility model is to provide a simple and stable folding structure for a wheelchair.

Description

Technical Field

[0001] This utility model belongs to the field of wheelchair technology, and specifically relates to a folding structure for a wheelchair. Background Technology

[0002] A wheelchair is a chair equipped with wheels that can help replace walking. It is an important mobility tool for the injured, sick, and disabled to use at home for rehabilitation, transportation, medical treatment, and outdoor activities. Wheelchairs not only meet the mobility needs of people with limb disabilities and limited mobility, but more importantly, they facilitate the movement and care of family members, and enable patients to exercise and participate in social activities with the help of wheelchairs.

[0003] To facilitate the transportation and carrying of wheelchairs, most wheelchairs on the market are foldable. For example, Chinese Utility Model Patent CN 202410341197.9 discloses a foldable wheelchair, which includes a wheelchair frame having an unfolded state and a folded state, a wheel assembly disposed at the bottom of the wheelchair frame, and a locking mechanism for locking the wheelchair frame in the unfolded state. The wheelchair frame includes a front wheel bracket, a rear wheel bracket, a seat post, and a backrest post. The front wheel bracket extends obliquely from the lower front to the upper rear, and the rear end of the front wheel bracket is rotatably connected to the lower end of the backrest post. The rear wheel bracket extends obliquely from the lower rear to the upper front, and the front end of the rear wheel bracket is rotatably connected to the front end of the seat post. The rear end of the seat post is rotatably connected to the middle of the backrest post. The wheelchair frame also includes a front link and a rear link. The upper end of the front link is rotatably connected to the front end of the seat post. The lower end of the seat rod is rotatably connected to the front end of the front wheel bracket, the upper end of the rear link is rotatably connected to the lower end of the backrest rod, and the lower end of the rear link is rotatably connected to the lower end of the rear wheel bracket; the seat rod, the backrest rod, the rear link, and the rear wheel bracket form a first four-bar linkage mechanism, and the seat rod, the backrest rod, the front wheel bracket, and the front link form a second four-bar linkage mechanism. When the locking mechanism is unlocked, the backrest rod is rotated forward to bring it closer to the seat rod, which in turn drives the upper end of the front link to flip forward and the upper end of the rear link to flip backward through the first and second four-bar linkage mechanisms, thereby pulling the seat rod, the front wheel bracket, and the rear wheel bracket closer together, thus realizing the folding of the wheelchair frame.

[0004] While the above structure is easy to operate and its mobility remains basically unchanged before and after folding, making it convenient for daily carrying and container transport, it has many parts and a relatively complex structure, making it inconvenient to manufacture and assemble. Furthermore, the locking mechanism is subjected to significant force during use, making it prone to damage and even causing the wheelchair to fold unexpectedly. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a folding structure for a wheelchair that is simple and stable.

[0006] The purpose of this utility model is achieved as follows:

[0007] A folding structure for a wheelchair includes a seat plate, a backrest frame rotatably mounted on the rear side of the seat plate, a front wheel frame rotatably mounted below the seat plate, a transmission link between the front wheel frame and the backrest frame, the transmission link being rotatably connected to the front wheel frame and the backrest frame respectively, the backrest frame, seat plate, front wheel frame and transmission link forming a four-bar linkage, and a support surface is provided on the front wheel frame, the support surface pressing against the seat plate when the wheelchair is unfolded;

[0008] The seat plate is movably provided with a limiting component, and the front wheel frame is provided with a limiting block adapted to the limiting component. The limiting component and the limiting block cooperate to restrict the relative rotation between the seat plate and the front wheel frame and keep the wheelchair in the unfolded state.

[0009] The present invention is further configured such that: the limiting member is rotatably mounted on the base plate, and the base plate is provided with an elastic member, which can drive the limiting member to reset and maintain cooperation with the limiting block.

[0010] The present invention is further configured such that: the front wheel frame includes a connecting rod and two mounting rods, the connecting rod is connected to the two mounting rods respectively to form a U-shaped structure, the two mounting rods are rotatably connected to the seat plate respectively, the backrest frame includes two uprights, a transmission connecting rod is provided between the uprights and the opposite mounting rods, and a limit block is provided on each mounting rod, and a limit member is provided on the seat plate respectively adapted to the upper limit block of the two mounting rods.

[0011] The present invention is further configured such that a control rod is provided between the limiting members on the two mounting rods, and the control rod can control the two limiting members to rotate synchronously.

[0012] The present invention is further configured such that: a support groove is provided on the front wheel frame, a protruding edge extends below the seat plate, a support surface is provided at the bottom of the support groove, and the protruding edge passes into the support groove and abuts against the support surface.

[0013] The present invention is further configured such that: the supporting surface is an arc-shaped surface set at the bottom of the supporting groove, the arc-shaped surface can abut against both sides of the convex edge and prevent the seat plate from swaying to both sides of the front wheel frame.

[0014] The present invention is further configured such that: a positioning hole is provided on the front wheel frame, a positioning part adapted to the positioning hole is provided on the limiting block, and the fastener is connected to the limiting block and the positioning hole is fixedly connected to the positioning part.

[0015] The present invention is further configured such that: the limiting block has an arc-shaped or cylindrical side wall, and the limiting member is guided by the side wall and cooperates with the limiting block.

[0016] The present invention is further configured such that: a first hinge rod and a second hinge rod are provided on the seat plate; the front wheel frame and the limiting member are rotatably connected to the seat plate through the first hinge rod and the second hinge rod respectively; the first hinge rod, the second hinge rod and the limiting block are arranged in a triangle; the limiting member is provided with a slot adapted to the limiting block; and a guide surface with the second hinge rod as the center is provided at the opening of the slot.

[0017] The advantages of this utility model compared to the prior art are:

[0018] 1. In this utility model, the backrest frame, seat plate, front wheel frame, and transmission linkage are combined to form a four-bar linkage, which has a simple structure and facilitates the assembly and production of wheelchairs. When the wheelchair is unfolded, the support surface is pressed against the seat plate. When the user sits on the seat plate, the support surface will abut against the front wheel frame, making the seat plate and the front wheel frame relatively fixed. The wheelchair will not fold accidentally, which helps to improve the stability of the wheelchair. In addition, the limiting parts and limiting blocks will not be subjected to additional forces during use, and the limiting parts and limiting blocks are not easily damaged, which helps to extend the service life of the wheelchair.

[0019] 2. The elastic element in this utility model helps to maintain the connection and cooperation between the limiting element and the limiting block, preventing the limiting element from accidentally disengaging from the limiting block during use and causing the wheelchair to fold unexpectedly, thus facilitating the movement and transportation of the wheelchair; the U-shaped front wheel frame helps to reduce the number of wheelchair parts, facilitating the assembly and production of the wheelchair, and both mounting rods can form a four-bar linkage with the transmission linkage, backrest frame and seat plate, which helps to improve the load-bearing capacity of the wheelchair and make it convenient for users of different weights to use; the control rod facilitates the synchronous movement of the two limiting elements, making it convenient for users to control the unfolding and folding of the wheelchair.

[0020] 3. The protruding edge and support groove in this utility model facilitate the stable installation of the front wheel frame and seat plate, avoid the front wheel frame and seat plate from being misaligned, and improve the stability of the wheelchair; the arc-shaped surface not only facilitates the stable installation of the front wheel frame and seat plate, but also facilitates the disassembly and installation of the protruding edge and support groove, reduces friction during the disassembly and installation process of the protruding edge and support groove, and facilitates the unfolding and folding of the wheelchair.

[0021] 4. The positioning holes, positioning parts and fasteners in this utility model facilitate the production and processing of the limiting block. After long-term use, when the limiting block is worn and deformed, the user can replace the limiting block, which helps to reduce the maintenance cost of the wheelchair and extend the service life of the wheelchair. The arc-shaped or cylindrical side wall facilitates the connection and cooperation between the limiting component and the limiting block, making it convenient for the wheelchair to unfold quickly.

[0022] 5. The first hinge rod, the second hinge rod, and the limiting block, which are arranged in a triangular pattern in this utility model, are conducive to the stable unfolding of the wheelchair. The guide surface with the second hinge rod as the center can prevent the limiting block from accidentally disengaging from the slot, and prevent the seat plate and front wheel frame from being subjected to force, which would cause the wheelchair to fold accidentally, thus facilitating the use of the wheelchair. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the wheelchair of this utility model when it is unfolded;

[0024] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0025] Figure 3 This is a schematic diagram of the structure of the wheelchair of this utility model when folded;

[0026] Figure 4 This is an exploded view of the present invention;

[0027] Figure 5 This is a sectional view of the installation structure of the wheelchair limiting component when it is unfolded according to this utility model;

[0028] Figure 6 This is a sectional view of the installation structure of the wheelchair folding front limiting component of this utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the middle seat plate of this utility model;

[0030] Figure 8 This is a schematic diagram of the front wheel frame in this utility model;

[0031] Figure 9 This is a cross-sectional view of the connection structure between the seat and wheel frame when the wheelchair of this utility model is unfolded;

[0032] Figure 10 This is a schematic diagram of the limiting component in this utility model.

[0033] The labels in the diagram have the following meanings: 1-Backrest frame; 11-Upright pole; 12-Push rod; 13-Fixed crossbar; 2-Seat plate; 21-Protruding edge; 22-First hinge rod; 23-Second hinge rod; 24-First fixed rod; 3-Front wheel frame; 31-Mounting rod; 32-Connecting rod; 33-Hinge part; 34-Limiting block; 35-Support groove; 36-Fastener; 311-Positioning hole; 341-Positioning part; 4-Transmission link; 5-Limiting component; 51-Slot; 52-Guide surface; 53-Second fixed rod; 54-Control rod; 55-Hinge hole; 6-Elastic component; 7-Armrest; 8-Support rod; 9-Pedal. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0035] See Figures 1 to 10 As shown, a folding structure for a wheelchair includes a seat plate 2, a backrest frame 1 rotatably mounted on the rear side of the seat plate 2, and a front wheel frame 3 rotatably mounted below the seat plate 2. A transmission link 4 is provided between the front wheel frame 3 and the backrest frame 1, and the transmission link 4 is rotatably connected to both the front wheel frame 3 and the backrest frame 1. The backrest frame 1, seat plate 2, front wheel frame 3, and transmission link 4 combine to form a four-bar linkage. The front wheel frame 3 is provided with a support surface, which abuts against the seat plate 2 when the wheelchair is unfolded. A limiting member 5 is movably mounted on the seat plate 2, and a limiting block 34 adapted to the limiting member 5 is provided on the front wheel frame 3. The limiting member 5 and the limiting block 34 cooperate to restrict the relative rotation of the seat plate 2 and the front wheel frame 3, and keep the wheelchair in the unfolded state.

[0036] In the above structure, the backrest frame 1, seat plate 2, front wheel frame 3, and transmission linkage 4 are combined to form a four-bar linkage. The structure is simple and convenient for the assembly and production of wheelchairs. When the wheelchair is unfolded, the support surface is pressed against the seat plate 2. When the user sits on the seat plate 2, the support surface will press against the front wheel frame 3, making the seat plate 2 and the front wheel frame 3 relatively fixed. The wheelchair will not fold accidentally, which helps to improve the stability of the wheelchair. In addition, the limiting parts 5 and 34 will not be subjected to additional forces during use. The limiting parts 5 and 34 are not easily damaged and help to extend the service life of the wheelchair.

[0037] The seat plate 2 is provided with a first hinge rod 22 and a second hinge rod 23. The front wheel frame 3 and the limiting member 5 are rotatably connected to the seat plate 2 through the first hinge rod 22 and the second hinge rod 23, respectively. The first hinge rod 22, the second hinge rod 23 and the limiting block 34 are arranged in a triangle. The limiting member 5 is provided with a slot 51 that matches the limiting block 34. The opening of the slot 51 is provided with a guide surface 52 centered on the second hinge rod 23. The triangular arrangement of the first hinge rod 22, the second hinge rod 23 and the limiting block 34 is conducive to the stable unfolding of the wheelchair. The guide surface 52 centered on the second hinge rod 23 can prevent the limiting block 34 from accidentally disengaging from the slot 51, and prevent the seat plate 2 and the front wheel frame 3 from being subjected to force, which would cause the wheelchair to fold accidentally, making the wheelchair convenient to use. In this embodiment, the limiting block 34 is provided with a hinge hole 55 that is rotatably connected to the second hinge rod 23.

[0038] In this embodiment, the backrest frame 1 is also rotatably provided with an armrest 7, which is located on the upper side of the seat plate 2. A support rod 8 is provided between the armrest 7 and the seat plate 2. The armrest 7, the support rod 8, the seat plate 2 and the backrest frame 1 form a linkage mechanism. When the wheelchair is folded, the seat plate 2 and the backrest frame 1 move relative to each other and drive the armrest 7 and the support rod 8 to fold relative to each other.

[0039] In this utility model, the limiting member 5 is rotatably mounted on the seat plate 2, and the seat plate 2 is provided with an elastic member 6. The elastic member 6 can drive the limiting member 5 to reset and maintain cooperation with the limiting block 34. The setting of the elastic member 6 is conducive to maintaining the connection and cooperation between the limiting member 5 and the limiting block 34, avoiding the limit member 5 from accidentally disengaging from the limiting block 34 during use, which would cause the wheelchair to fold accidentally, and facilitating the movement and transportation of the wheelchair. In this embodiment, the elastic member 6 is a compression spring. The seat plate 2 and the limiting member 5 are respectively provided with a first fixing rod 24 and a second fixing rod 53, and the two ends of the compression spring are respectively connected to the first fixing rod 24 and the second fixing rod 53.

[0040] The front wheel frame 3 includes a connecting rod 32 and two mounting rods 31. The connecting rod 32 is connected to the two mounting rods 31 to form a U-shaped structure. The two mounting rods 31 are rotatably connected to the seat plate 2. The backrest frame 1 includes two uprights 11. A transmission link 4 is provided between the uprights 11 and the opposite mounting rods 31. Each mounting rod 31 is provided with a limit block 34. The seat plate 2 is provided with a limit member 5 that is adapted to the upper limit block 34 of the two mounting rods 31. The U-shaped front wheel frame 3 helps to reduce the number of wheelchair parts and facilitates the assembly and production of the wheelchair. Both mounting rods 31 can form a four-bar linkage with the transmission link 4, the backrest frame 1 and the seat plate 2, which helps to improve the load-bearing capacity of the wheelchair and makes it convenient for users of different weights to use.

[0041] A pedal 9 is rotatably mounted on the connecting rod 32. The pedal 9 can be flipped and folded to the front wheel frame 3. When the wheelchair is unfolded, the pedal 9 abuts against the connecting rod 32 under the action of gravity, and the pedal 9 unfolds relative to the front wheel frame 3.

[0042] In this utility model, a control rod 54 is provided between the limiting members 5 on the two mounting rods 31. The control rod 54 can control the two limiting members 5 to rotate synchronously. The setting of the control rod 54 facilitates the synchronous movement of the two limiting members 5, making it convenient for the user to control the unfolding and folding of the wheelchair.

[0043] In this embodiment, the upper ends of the two uprights 11 are connected by a push rod 12, and several fixed crossbars 13 are also provided between the two uprights 11. The rear wheels of the wheelchair are installed at the lower ends of the uprights 11, and the front wheels of the wheelchair are installed at the lower ends of the front wheel frame 3.

[0044] The front wheel frame 3 is provided with a support groove 35. The side of the support groove 35 extends to form a hinge part 33 that is rotatably connected to the seat plate 2. A protruding edge 21 extends from the bottom of the seat plate 2. The support surface is set at the bottom of the support groove 35. The protruding edge 21 passes into the support groove 35 and abuts against the support surface. The arrangement of the protruding edge 21 and the support groove 35 facilitates the stable installation of the front wheel frame 3 and the seat plate 2, avoids the front wheel frame 3 and the seat plate 2 from being misaligned, and helps to improve the stability of the wheelchair.

[0045] Preferably, the support surface is an arc-shaped surface set at the bottom of the support groove 35. The arc-shaped surface can abut against both sides of the convex edge 21 and prevent the seat plate 2 from wobbling to both sides of the front wheel frame 3. The arc-shaped surface not only facilitates the stable installation of the front wheel frame 3 and the seat plate 2, but also facilitates the disassembly and installation of the convex edge 21 and the support groove 35, reducing friction during the disassembly and installation process of the convex edge 21 and the support groove 35, and making it convenient for the wheelchair to unfold and fold.

[0046] The front wheel frame 3 is provided with a positioning hole 311, and the limiting block 34 is provided with a positioning part 341 that is adapted to the positioning hole 311. The fastener 36 is connected to the limiting block 34 and fixes the positioning hole 311 and the positioning part 341. The positioning hole 311, the positioning part 341 and the fastener 36 are provided to facilitate the production and processing of the limiting block 34. After long-term use, when the limiting block 34 is worn and deformed, the user can replace the limiting block 34, which helps to reduce the maintenance cost of the wheelchair and extend the service life of the wheelchair.

[0047] The limiting block 34 described in this utility model has an arc-shaped or cylindrical side wall. The limiting member 5 is guided by the side wall and cooperates with the limiting block 34. The arc-shaped or cylindrical side wall facilitates the connection and cooperation between the limiting member 5 and the limiting block 34, making it convenient for the wheelchair to unfold quickly.

[0048] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A folding structure for a wheelchair, comprising a seat plate (2), wherein a backrest frame (1) is rotatably mounted on the rear side of the seat plate (2), characterized in that: A front wheel frame (3) is rotatably mounted below the seat plate (2). A transmission link (4) is provided between the front wheel frame (3) and the backrest frame (1). The transmission link (4) is rotatably connected to the front wheel frame (3) and the backrest frame (1). The backrest frame (1), seat plate (2), front wheel frame (3) and transmission link (4) are combined to form a four-bar linkage. A support surface is provided on the front wheel frame (3). When the wheelchair is unfolded, the support surface is pressed against the seat plate (2). A limiting member (5) is movably provided on the seat plate (2), and a limiting block (34) adapted to the limiting member (5) is provided on the front wheel frame (3). The limiting member (5) and the limiting block (34) cooperate to restrict the relative rotation between the seat plate (2) and the front wheel frame (3) and keep the wheelchair in an unfolded state.

2. The folding structure of a wheelchair according to claim 1, characterized in that: The limiting member (5) is rotatably mounted on the seat plate (2), and the seat plate (2) is provided with an elastic member (6). The elastic member (6) can drive the limiting member (5) to reset and maintain cooperation with the limiting block (34).

3. The folding structure of a wheelchair according to claim 1 or 2, characterized in that: The front wheel frame (3) includes a connecting rod (32) and two mounting rods (31). The connecting rod (32) is connected to the two mounting rods (31) respectively to form a U-shaped structure. The two mounting rods (31) are rotatably connected to the seat plate (2). The backrest frame (1) includes two uprights (11). A transmission connecting rod (4) is provided between the uprights (11) and the opposite mounting rods (31). A limit block (34) is provided on each mounting rod (31). A limit member (5) is provided on the seat plate (2) to be adapted to the upper limit block (34) of the two mounting rods (31).

4. The folding structure of a wheelchair according to claim 3, characterized in that: A control rod (54) is provided between the limiting members (5) on the two mounting rods (31), and the control rod (54) can control the two limiting members (5) to rotate synchronously.

5. A folding structure for a wheelchair according to claim 1, 2, or 4, characterized in that: The front wheel frame (3) is provided with a support groove (35), and a protruding edge (21) extends below the seat plate (2). The support surface is set at the bottom of the support groove (35), and the protruding edge (21) passes into the support groove (35) and abuts against the support surface.

6. The folding structure of a wheelchair according to claim 5, characterized in that: The support surface is an arc-shaped surface set at the bottom of the support groove (35). The arc-shaped surface can abut against both sides of the convex edge (21) and prevent the seat plate (2) from swaying to both sides of the front wheel frame (3).

7. A folding structure for a wheelchair according to claim 1, 2, 4, or 6, characterized in that: The front wheel frame (3) is provided with a positioning hole (311), and the limiting block (34) is provided with a positioning part (341) that is adapted to the positioning hole (311). The fastener (36) is connected to the limiting block (34) and the positioning hole (311) is fixedly connected to the positioning part (341).

8. The folding structure of a wheelchair according to claim 7, characterized in that: The limiting block (34) has an arc-shaped or cylindrical sidewall, and the limiting member (5) is guided by the sidewall and cooperates with the limiting block (34).

9. A folding structure for a wheelchair according to claim 1, 2, 4, 6, or 8, characterized in that: The seat plate (2) is provided with a first hinge rod (22) and a second hinge rod (23). The front wheel frame (3) and the limiting member (5) are rotatably connected to the seat plate (2) through the first hinge rod (22) and the second hinge rod (23), respectively. The first hinge rod (22), the second hinge rod (23) and the limiting block (34) are arranged in a triangle. The limiting member (5) is provided with a slot (51) that matches the limiting block (34). The opening of the slot (51) is provided with a guide surface (52) with the second hinge rod (23) as the center.

Images