Foldable wheelchair frame

Abstract

The foldable wheelchair frame provided by the utility model is novel in structure, good in support, convenient to unfold and fold, and the bottom support frame is triangular in shape, the bottom support rod is rotatably connected to the front part of the bottom support frame at the lower end, the upper end of the bottom support rod is rotatably connected to the front part or the middle part of the seat rod, the lower end of the backrest rod is rotatably connected to the rear end of the bottom support frame, and the middle part of the backrest rod is rotatably connected to the rear end of the seat rod, so that the bottom support rod, the seat rod, the backrest rod and the bottom support frame form a four-link mechanism, the backrest rod, the seat rod, the bottom support rod and the bottom support frame are brought close to each other to realize folding when the backrest rod is turned forward, and a stable triangular support structure is formed on the two sides of the bottom support frame.

Description

Technical Field

[0001] This utility model belongs to the field of wheelchair technology, specifically relating to a foldable wheelchair frame. Background Technology

[0002] Wheelchairs are chairs equipped with wheels that can help replace walking. They are important mobility tools for the injured, sick, and disabled for home rehabilitation, transportation, medical treatment, and outdoor activities. Most traditional wheelchairs are not foldable and take up a lot of space. To solve this problem, foldable wheelchairs have appeared on the market. The frames of these wheelchairs mostly use cross-shaped and rotatably connected front and rear wheel supports. Folding is achieved by the front and rear wheel supports coming together. For example, Chinese patent CN120392440A discloses such a wheelchair. However, when this solution is in use, the gap between the front and rear wheels is relatively large, the support is relatively weak, the stability is generally poor, and it is difficult to meet market demand. Utility Model Content

[0003] The purpose of this invention is to overcome one or more shortcomings in the prior art and provide a foldable wheelchair frame with a novel structure, good support, and convenient operation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is a foldable wheelchair frame, comprising:

[0005] Bottom support frames located on both sides;

[0006] A horizontal bar that connects the bottom support frames on both sides into one piece;

[0007] The base support rod, backrest rod, seat rod, and locking mechanism for locking the foldable wheelchair frame in the unfolded state;

[0008] The projection of the bottom support frame in the left-right direction is triangular. The lower end of the bottom support rod is rotatably connected to the front of the bottom support frame, and the upper end of the bottom support rod is rotatably connected to the front or middle of the seat rod. The lower end of the backrest rod is rotatably connected to the rear end of the bottom support frame, and the middle of the backrest rod is rotatably connected to the rear end of the seat rod. This makes the bottom support rod, the seat rod, the backrest rod, and the bottom support frame form a four-bar linkage. When the backrest rod flips forward, the four-bar linkage can drive the backrest rod, the seat rod, the bottom support rod, and the bottom support frame to move closer together, thus achieving folding.

[0009] Preferably, the bottom support frame includes a first rod, a second rod, and a third rod connected end to end, with the first rod and the third rod being perpendicular to each other.

[0010] More preferably, a bushing for connecting the front wheel assembly is provided at the connection between the first rod and the second rod, and a bracket for connecting the rear wheel assembly is provided at the connection between the first rod and the third rod.

[0011] More preferably, the bottom support frame further includes a short support rod disposed between the first rod and the second rod, the short support rod being disposed near the connection between the first rod and the second rod, and the crossbar connecting the first rods on both sides and aligned with the short support rod.

[0012] More preferably, the lower end of the bottom support rod is rotatably connected to the middle of the short support rod, and the upper end of the bottom support rod extends obliquely upward and backward. When folded, the upper end of the bottom support rod rotates from the rear of its lower end to the front.

[0013] More preferably, the backrest rod is rotatably connected at the connection between the second rod and the third rod, and when unfolded, the backrest rod and the third rod are located on the same plane.

[0014] Preferably, the rear end of the seat rod is connected to a connector, and when unfolded, the upper and middle parts of the connector are on the same plane as the backrest rod.

[0015] More preferably, the locking mechanism includes a locking plate, a locking pin, and a locking hole. The locking plate is connected to the bottom of the connector and extends in the opposite direction. The locking pin is movably inserted through the locking plate. The locking hole is located at the lower part of the backrest rod. When unfolded, the locking pin aligns with the locking hole and is inserted into the locking hole, thereby locking the four-bar linkage.

[0016] More preferably, the locking plate is in the shape of a triangular plate that gradually narrows downwards, the locking pin is set near the bottom sharp corner of the locking plate, the inner end of the locking pin is located on the inner side of the locking plate and is connected to an unlocking pull ring, and the outer end of the locking pin is used to insert into the locking hole to lock the four-bar linkage mechanism.

[0017] More preferably, the locking mechanism further includes a limiting block connected to the inner side of the backrest rod. The limiting block has an inwardly extending baffle portion, the extension direction of which is parallel to the backrest rod. When unfolded, the baffle portion abuts against the rear sidewall of the locking plate, aligning the locking pin with the locking hole.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] The foldable wheelchair frame provided by this utility model includes bottom support frames on both sides, a crossbar connecting the bottom support frames on both sides, a bottom support rod, a backrest rod, a seat rod, and a locking mechanism for locking the foldable wheelchair frame in the unfolded state. By making the projection of the bottom support frame in the left and right directions into a triangle, the lower end of the bottom support rod is rotatably connected to the front of the bottom support frame, the upper end of the bottom support rod is rotatably connected to the front or middle of the seat rod, the lower end of the backrest rod is rotatably connected to the rear end of the bottom support frame, and the middle of the backrest rod is rotatably connected to the rear end of the seat rod. This allows the bottom support rod, seat rod, backrest rod, and bottom support frame to form a four-bar linkage mechanism. When the backrest rod is flipped forward, the four-bar linkage mechanism drives the backrest rod, seat rod, bottom support rod, and bottom support frame to come together to achieve folding. It also utilizes the bottom support frame to form a stable triangular support structure on both sides. The structure is novel, has good support, and is convenient for unfolding and folding. Attached Figure Description

[0020] Figure 1 , Figure 2 , Figure 3 This is a longitudinal sectional view of a preferred embodiment of the present invention, wherein, Figure 1 In the unfolded state, Figure 3 It is in a folded state. Figure 2 This is an intermediate state between the unfolded state and the folded state.

[0021] Figure 4 yes Figure 1 Exploded view of the locking mechanism.

[0022] The components are as follows: 10. Bottom support frame; 11. First rod; 12. Second rod; 13. Third rod; 14. Short support rod; 15. Bushing; 16. Bracket; 161. Mounting plate; 162. Bracket crossbeam; 20. Crossbar; 30. Bottom support rod; 40. Backrest rod; 41. Slide rail; 42. Backrest crossbar; 50. Seat rod; 51. Connector; 60. Locking mechanism; 61. Locking plate; 62. Locking pin; 621. Bolt; 622. Unlocking pull ring; 63. Locking hole; 64. Limiting block; 641. Edge guard. Detailed Implementation

[0023] The front-back, left-right, and up-down directions described in this utility model are the front-back, left-right, and up-down directions as observed by the user when riding the foldable wheelchair frame.

[0024] like Figures 1 to 4As shown, the foldable wheelchair frame provided by this utility model includes: a bottom support frame 10 disposed on the left and right sides, a crossbar 20 connecting the left and right bottom support frames 10 as a whole, a bottom support rod 30, a backrest rod 40, a seat rod 50, and a locking mechanism 60 for locking the foldable wheelchair frame in the unfolded state; wherein, the projection of the bottom support frame 10 in the left and right direction is triangular, specifically, the bottom support frame 10 includes a first rod 11, a second rod 12, and a third rod 13 connected end to end, the first rod 11 and the third rod 13 being perpendicular, the bottom support frame 10 also includes a short support rod 14 disposed between the first rod 11 and the second rod 12, the short support rod 14 being disposed near the connection point of the first rod 11 and the second rod 12; the crossbar 20 is connected between the first rods 11 on the left and right sides and aligned with the short support rod 14 in the left and right direction; the lower end of the bottom support rod 30 is rotatably connected to the front of the bottom support frame 10. The upper end of the bottom support rod 30 is rotatably connected to the front or middle part of the seat rod 50. Specifically, the lower end of the bottom support rod 30 is rotatably connected to the middle part of the short support rod 14. The upper end of the bottom support rod 30 extends backward and upward. When folded, the upper end of the bottom support rod 30 rotates from the rear of its lower end to the front. The lower end of the backrest rod 40 is rotatably connected to the rear end of the bottom support frame 10. Specifically, the backrest rod 40 is rotatably connected to the connection between the second rod 12 and the third rod 13. When unfolded, the backrest rod 40 and the third rod 13 on the left and right sides are located on the same plane. The middle part of the backrest rod 40 is rotatably connected to the rear end of the seat rod 50, so that the bottom support rod 30, the seat rod 50, the backrest rod 40 and the bottom support frame 10 form a four-bar linkage. When the backrest rod 40 is flipped forward, the four-bar linkage can drive the backrest rod 40, the seat rod 50, the bottom support rod 30 and the bottom support frame 10 to move closer together, so as to achieve folding.

[0025] The advantage of this design is that it allows the bottom support rod, seat rod, backrest rod, and bottom support frame to form a four-bar linkage mechanism. When the backrest rod flips forward, the four-bar linkage mechanism drives the backrest rod, seat rod, bottom support rod, and bottom support frame to come together to achieve folding, making the unfolding and folding operation more convenient. It also allows the bottom support frame to form a stable triangular support structure on the left and right sides, resulting in a novel structure with good support.

[0026] In this embodiment, a bushing 15 for connecting the front wheel assembly is provided at the connection between the first rod 11 and the second rod 12, and a bracket 16 for connecting the rear wheel assembly is provided at the connection between the first rod 11 and the third rod 13. The bracket 16 includes a mounting plate 161 and a bracket beam 162 connected between the two mounting plates 161.

[0027] For ease of connection, in this embodiment, the rear end of the seat rod 50 is connected to a connector 51. When unfolded, the upper and middle parts of the connectors 51 on the left and right sides are on the same plane as the backrest rod 40.

[0028] In this embodiment, the locking mechanism 60 includes a locking plate 61, a locking pin 62, and a locking hole 63. The locking plate 61 is connected to the bottom of the connector 51 and extends in the opposite direction. The locking pin 62 is movably mounted on the bolt 621, which is connected to and passes through the locking plate 61, allowing the locking pin 62 to move movably on the locking plate 61. The locking hole 63 is located at the lower part of the backrest rod 40. When unfolded, the locking pin 62 aligns with the locking hole 63 and is inserted into the locking hole 63, fixing the relative position of the backrest rod 40 and the seat rod 50, thereby locking the four-bar linkage so that the foldable wheelchair frame is locked in the unfolded state.

[0029] Furthermore, the locking plate 61 is a triangular plate that gradually narrows downwards. The locking pin 62 is located near the bottom corner of the locking plate 61. The inner end of the locking pin 62 is located inside the locking plate 61 and is connected to the unlocking pull ring 622. The outer end of the locking pin 62 is used to insert into the locking hole 63 to lock the four-bar linkage mechanism. When unlocking, the unlocking pull ring 622 is pulled inward to disengage the outer end of the locking pin 62 from the locking hole 63.

[0030] To facilitate alignment, the locking mechanism 60 further includes a limiting block 64, which is connected to the inner side of the backrest rod 40. The locking hole 63 corresponds to and passes through the limiting block 64. The limiting block 64 is provided with an inwardly extending baffle 641, the extension direction of which is parallel to the backrest rod 40. When unfolded, the baffle 641 abuts against the rear side wall of the locking plate 61, so that the locking pin 62 is aligned with the locking hole 63.

[0031] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A foldable wheelchair frame, comprising: Bottom support frames located on both sides; A horizontal bar that connects the bottom support frames on both sides into one piece; The base support rod, backrest rod, seat rod, and locking mechanism for locking the foldable wheelchair frame in the unfolded state; Its features are: The projection of the bottom support frame in the left-right direction is triangular. The lower end of the bottom support rod is rotatably connected to the front of the bottom support frame, and the upper end of the bottom support rod is rotatably connected to the front or middle of the seat rod. The lower end of the backrest rod is rotatably connected to the rear end of the bottom support frame, and the middle of the backrest rod is rotatably connected to the rear end of the seat rod. This makes the bottom support rod, the seat rod, the backrest rod, and the bottom support frame form a four-bar linkage. When the backrest rod flips forward, the four-bar linkage can drive the backrest rod, the seat rod, the bottom support rod, and the bottom support frame to move closer together, thus achieving folding.

2. The foldable wheelchair frame according to claim 1, characterized in that: The bottom support frame includes a first rod, a second rod, and a third rod connected end to end, with the first rod perpendicular to the third rod.

3. The foldable wheelchair frame according to claim 2, characterized in that: The connection between the first rod and the second rod is provided with a bushing for connecting the front wheel assembly, and the connection between the first rod and the third rod is provided with a bracket for connecting the rear wheel assembly.

4. The foldable wheelchair frame according to claim 2, characterized in that: The bottom support frame also includes a short support rod disposed between the first rod and the second rod. The short support rod is disposed near the connection between the first rod and the second rod. The crossbar is connected between the first rods on both sides and aligned with the short support rod.

5. The foldable wheelchair frame according to claim 4, characterized in that: The lower end of the bottom support rod is rotatably connected to the middle of the short support rod, and the upper end of the bottom support rod extends backward and upward at an angle. When folded, the upper end of the bottom support rod rotates from the rear of its lower end to the front.

6. The foldable wheelchair frame according to claim 2, characterized in that: The backrest rod is rotatably connected at the connection between the second rod and the third rod. When unfolded, the backrest rod and the third rod are located on the same plane.

7. The foldable wheelchair frame according to claim 1, characterized in that: The rear end of the seat rod is connected to a connector. When unfolded, the upper and middle parts of the connector are on the same plane as the backrest rod.

8. The foldable wheelchair frame according to claim 7, characterized in that: The locking mechanism includes a locking plate, a locking pin, and a locking hole. The locking plate is connected to the bottom of the connector and extends in the opposite direction. The locking pin is movably inserted through the locking plate. The locking hole is located at the lower part of the backrest rod. When unfolded, the locking pin aligns with the locking hole and is inserted into the locking hole, thereby locking the four-bar linkage.

9. The foldable wheelchair frame according to claim 8, characterized in that: The locking plate is a triangular plate that gradually narrows downwards. The locking pin is located near the bottom corner of the locking plate. The inner end of the locking pin is located on the inner side of the locking plate and is connected to an unlocking pull ring. The outer end of the locking pin is used to insert into the locking hole to lock the four-bar linkage.

10. The foldable wheelchair frame according to claim 8, characterized in that: The locking mechanism further includes a limiting block connected to the inner side of the backrest rod. The limiting block has an inwardly extending baffle portion, the extension direction of which is parallel to the backrest rod. When unfolded, the baffle portion abuts against the rear side wall of the locking plate, aligning the locking pin with the locking hole.

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