A chassis folding type foldable wheelchair frame

Abstract

The chassis folding type foldable wheelchair frame provided by the utility model can form three four-link mechanisms, and can drive two chassis frames to stagger and shorten the length of the chassis when folding.

Description

Technical Field

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

[0002] A wheelchair is a chair equipped with wheels that helps replace walking. The wheelchair frame is the main component of a wheelchair. To reduce the space occupied when not in use, most existing wheelchair frames are foldable. These folding wheelchair frames are broadly divided into two categories based on their structure: those with a base and those without a base. The former folds by bringing the front and rear wheel supports together. When in use, the gap between the front and rear wheels is relatively large, resulting in relatively weak support and average stability. The latter folds by bringing the backrest, seat, and various support rods together towards the base. Due to the presence of the base, the support and stability during use are better. However, the size of the folded wheelchair frame depends entirely on the size of the base. The length of the base cannot be too short. A base that is too short provides weak support to the wheelchair frame in the front-to-back direction, making it easy to tip over due to inertia during use. At the same time, a base that is too short does not provide space for placing items or setting up other auxiliary equipment, resulting in poor usability and expandability. While a base that is too long can provide additional usable space, it affects the space occupied after folding and makes storage inconvenient. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a foldable wheelchair frame with a foldable chassis.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is a chassis-foldable foldable wheelchair frame, including a chassis and a seat bar disposed above the chassis, as well as a support rod assembly that supports the seat bar on the chassis.

[0005] The chassis includes an upper chassis frame and a lower chassis frame stacked on top of each other, as well as a connecting plate. The front end of the connecting plate is rotatably connected to the rear end of the lower chassis frame, and the rear end of the connecting plate is rotatably connected to the middle of the upper chassis frame.

[0006] The strut assembly includes a first strut and a second strut that are X-shaped and cross-hinged. The first strut includes a first segment and a first rod body. The second strut includes a second segment and a second rod body. The upper end of the first segment is rotatably connected to the bottom front part of the seat rod. The lower end of the first segment is rotatably connected to the upper end of the first rod body. The middle part of the first rod body is rotatably connected to the middle part of the second rod body. The lower end of the first rod body is rotatably connected to the middle part of the upper chassis frame. The lower end of the second segment is rotatably connected to the rear part of the lower chassis frame. The middle part of the second segment is rotatably connected to the front part of the upper chassis frame. The upper end of the second segment is rotatably connected to the lower end of the second rod body. The upper end of the second rod body is rotatably connected to the bottom rear part of the seat rod.

[0007] The first segment, the first rod, the seat rod, and the second rod form the first four-bar linkage; the second segment, the second rod, the first rod, and the upper chassis frame form the second four-bar linkage; and the second segment, the upper chassis frame, the connecting plate, and the lower chassis frame form the third four-bar linkage. When the foldable wheelchair frame is folded up, these three four-bar linkages work together to lift the upper chassis frame and flip it forward until it comes close to the lower chassis frame for folding up, thus achieving chassis folding.

[0008] Preferably, when the foldable wheelchair frame is unfolded, the first segment and the first rod are aligned in a straight line.

[0009] Preferably, the front end of the second segment is bent forward horizontally, and when the foldable wheelchair frame is unfolded, the front end of the second segment is flush with the lower chassis frame, and the middle and upper ends of the second segment are aligned with the second rod.

[0010] Preferably, the rear end of the connecting plate is bent vertically upwards, and when the foldable wheelchair frame is unfolded, the middle and front ends of the connecting plate are flush with the lower chassis frame.

[0011] Preferably, the foldable wheelchair frame further includes a locking mechanism for locking it in the unfolded state. The locking mechanism includes a hook and a locking plate. The hook is disposed on either the upper chassis frame or the lower chassis frame, and the locking plate is disposed on the other. When the hook engages the locking plate, the relative positions of the upper chassis frame and the lower chassis frame are locked, thereby locking the three four-bar linkages.

[0012] Preferably, the foldable wheelchair frame also includes a backrest rod, the lower part of which is rotatably connected to the rear end of the seat rod. The lower end of the backrest rod is connected to the support rod assembly via a transmission rod assembly. When the backrest rod flips forward, the transmission rod assembly can drive the support rod assembly to move, thereby driving the three four-bar linkages to achieve the folding of the foldable wheelchair frame.

[0013] More preferably, the transmission rod assembly includes a first transmission rod and a second transmission rod. The lower end of the first transmission rod is fixedly connected to the upper end of the second rod, the upper end of the first transmission rod is rotatably connected to the upper end of the second transmission rod, and the lower end of the second transmission rod is rotatably connected to the lower end of the backrest rod, so that the first transmission rod, the second transmission rod, the backrest rod, and the seat rod constitute a fourth four-bar linkage.

[0014] Preferably, both the lower chassis frame and the upper chassis frame are U-shaped, and the outer side wall of the lower chassis frame is connected to an upwardly extending anti-misalignment plate. The anti-misalignment plate is used to abut against the outer side wall of the upper chassis frame to prevent the upper chassis frame and the lower chassis frame from misaligning in the left-right direction.

[0015] More preferably, the first rod and the first segment are located on the outside of the lower chassis frame, and the connecting plate is located on the inside of the upper chassis frame.

[0016] Preferably, the seat rod includes a U-shaped rod with a rear opening and a seat crossbar connected to the rear opening of the U-shaped rod. A transverse support rod is connected to the middle of the first rod located on both sides, and a connecting plate crossbar is connected to the middle of the connecting plate located on both sides.

[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0018] 1. By comprising a chassis including stacked upper and lower chassis frames, and a connecting plate whose front end is rotatably connected to the rear end of the lower chassis frame and whose rear end is rotatably connected to the middle of the upper chassis frame; and a support rod assembly including a first support rod having a first segment and a first rod body, and a second support rod having a second segment and a second rod body, wherein the upper end of the first segment is rotatably connected to the front of the bottom of the seat rod, and the lower end is rotatably connected to the upper end of the first rod body; the middle of the first rod body is rotatably connected to the middle of the second rod body, and the lower end is rotatably connected to the middle of the upper chassis frame; the lower end of the second segment is rotatably connected to the rear of the lower chassis frame, the middle part is rotatably connected to the front of the upper chassis frame, and the upper end is rotatably connected to the lower end of the second rod body; and the upper end of the second rod body is rotatably connected to the rear of the bottom of the seat rod, three four-bar linkages can be formed. During folding, these three four-bar linkages work together, enabling the seat rod and support rod assembly to lower their height and move closer to the chassis for folding, and also enabling the upper chassis frame to rise, flip forward, and move closer to the lower chassis frame for folding, thus achieving chassis folding.

[0019] 2. When unfolded, the total length of the chassis can be increased by reducing the degree of overlap between the upper and lower chassis frames in the front-to-back direction, thereby improving support and optimizing ease of use and expandability; when folded, the total length of the chassis can be shortened by increasing the degree of overlap between the upper and lower chassis frames in the front-to-back direction, thereby reducing the space occupied after folding and facilitating storage. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a preferred embodiment of the present invention.

[0021] Figure 2 yes Figure 1 A left-side view diagram.

[0022] Figure 3 , Figure 4 yes Figure 2 A schematic diagram of the folding process of the foldable wheelchair frame.

[0023] Figure 5 yes Figure 2 The diagram shows the folded wheelchair frame.

[0024] The components are as follows: 10. Chassis; 11. Upper chassis frame; 12. Lower chassis frame; 13. Connecting plate; 131. Connecting plate crossbar; 14. Anti-misalignment plate; 20. Seat rod; 21. U-shaped rod; 22. Seat crossbar; 30. Support rod assembly; 31. First support rod; 311. First segment; 312. First rod body; 313. Lateral support rod; 32. Second support rod; 321. Second segment; 322. Second rod body; 41. Hook; 42. Locking plate; 50. Backrest rod; 60. Transmission rod assembly; 61. First transmission rod; 62. Second transmission rod. Detailed Implementation

[0025] 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.

[0026] like Figures 1 to 5 As shown, the foldable wheelchair frame with a foldable chassis provided by this utility model includes a chassis 10, a seat post 20, and a support rod assembly 30. The chassis 10 includes an upper chassis frame 11 and a lower chassis frame 12 stacked vertically, and a connecting plate 13. The front end of the connecting plate 13 is rotatably connected to the rear end of the lower chassis frame 12, and the rear end of the connecting plate 13 is bent vertically upwards and rotatably connected to the middle of the upper chassis frame 11. The seat post 20 is located above the chassis 10. The support rod assembly 30 is used to hold the seat post folded down. The rod 20 is supported on the chassis 10. The strut assembly 30 includes a first strut 31 and a second strut 32 that are X-shaped and hinged together. The first strut 31 includes a first segment 311 and a first rod body 312. The second strut 32 includes a second segment 321 and a second rod body 322. The upper end of the first segment 311 is rotatably connected to the bottom front part of the seat rod 20, and the lower end of the first segment 311 is rotatably connected to the upper end of the first rod body 312. The middle part of the first rod body 312 is connected to the second rod body 322. The middle part of segment 2 is rotatably connected, the lower end of the first rod 312 is rotatably connected to the middle part of the upper chassis frame 11, the lower end of the second segment 321 is rotatably connected to the rear part of the lower chassis frame 12, the middle part of the second segment 321 is rotatably connected to the front part of the upper chassis frame 11, the upper end of the second segment 321 is rotatably connected to the lower end of the second rod 322, and the upper end of the second rod 322 is rotatably connected to the bottom rear part of the seat rod 20; thus, the first segment 311, the first rod 312, and the seat rod 20 are rotatably connected. 0. The second rod 322 constitutes the first four-bar linkage, and the second segment 321, the second rod 322, the first rod 312, and the upper chassis frame 11 constitute the second four-bar linkage, and the second segment 321, the upper chassis frame 11, the connecting plate 13, and the lower chassis frame 12 constitute the third four-bar linkage. When the foldable wheelchair frame is folded, these three four-bar linkages work together to lift the upper chassis frame 11 and flip it forward until it is close to the lower chassis frame 12 and folded, so as to shorten the chassis length.

[0027] The advantage of this setting is that:

[0028] 1. During folding, the seat rod and support rod assembly can be lowered and brought closer to the chassis for folding through the linkage of three four-bar linkages, and the upper chassis frame can be raised, flipped forward and brought closer to the lower chassis frame for folding, thus realizing chassis folding.

[0029] 2. When unfolded, the total length of the chassis can be increased by reducing the degree of overlap between the upper and lower chassis frames in the front-to-back direction, thereby improving support and optimizing ease of use and expandability; when folded, the total length of the chassis can be shortened by increasing the degree of overlap between the upper and lower chassis frames in the front-to-back direction, thereby reducing the space occupied after folding and facilitating storage.

[0030] In this embodiment, the front end of the second segment 321 is bent forward horizontally. When the foldable wheelchair frame is unfolded, the front end of the second segment 321 is flush with the lower chassis frame 12, and the middle and upper ends of the second segment 321 are in the same straight line as the second rod 322. At the same time, the first segment 311 and the first rod 312 are in the same straight line, and the middle and front ends of the connecting plate 13 are flush with the lower chassis frame 12, so as to improve the aesthetics and high-end feel of the foldable wheelchair frame.

[0031] In this embodiment, the foldable wheelchair frame also includes a locking mechanism for locking it in the unfolded state. The locking mechanism includes a hook 41 and a locking plate 42. The hook 41 is disposed on the lower chassis frame 12, and the locking plate 42 is disposed on the upper chassis frame 11. When the hook 41 hooks the locking plate 42, the relative positions of the upper chassis frame 11 and the lower chassis frame 12 are locked, thereby locking the three four-bar linkages and keeping the foldable wheelchair frame in the unfolded state. The specific structure and position of the hook 41 and the locking plate 42 can be referred to the prior art, and will not be described in detail here.

[0032] To further enhance ease of use, in this embodiment, the foldable wheelchair frame also includes a backrest rod 50. The lower part of the backrest rod 50 is rotatably connected to the rear end of the seat rod 20. The lower end of the backrest rod 50 is connected to the support rod assembly 30 through a transmission rod group 60. When the backrest rod 50 flips forward, it can drive the support rod assembly 30 to move through the transmission rod group 60, thereby driving the three four-bar linkages to work together to realize the folding of the foldable wheelchair frame.

[0033] Specifically, the transmission rod assembly 60 includes a first transmission rod 61 and a second transmission rod 62. The lower end of the first transmission rod 61 is fixedly connected to the upper end of the second rod body 322, the upper end of the first transmission rod 61 is rotatably connected to the upper end of the second transmission rod 62, and the lower end of the second transmission rod 62 is rotatably connected to the lower end of the backrest rod, so that the first transmission rod 61, the second transmission rod 62, the backrest rod 50 and the seat rod 20 constitute a fourth four-bar linkage. When the foldable wheelchair frame is in the unfolded state, the first transmission rod 61, the second transmission rod 62 and the backrest rod 50 are arranged in a Z-shape.

[0034] To enhance the strength of the chassis 10, in this embodiment, both the lower chassis frame 12 and the upper chassis frame 11 are U-shaped. The lower chassis frame 12 and the upper chassis frame 11 are rotatably connected to the connecting plate 13 and the strut assembly 30 via longitudinal beams extending in the front-rear direction. Furthermore, the seat rod 20 includes a U-shaped rod 21 with a rear opening and a seat crossbar 22 connected to the rear opening of the U-shaped rod 21. A transverse support rod 313 is connected to the middle of the first rod 312 on both sides, and a connecting plate crossbar 131 is connected to the middle of the connecting plate 13 on both sides.

[0035] To prevent misalignment, in this embodiment, an upwardly extending anti-misalignment plate 14 is connected to the outer side wall of the lower chassis frame 12. The anti-misalignment plate 14 is used to press against the outer side wall of the upper chassis frame 11 to prevent misalignment between the upper chassis frame 11 and the lower chassis frame 12 in the left and right directions when unfolding and folding.

[0036] To avoid interference, the first rod 312 and the first segment 311 are located on the outside of the lower chassis frame 12, and the connecting plate 13 is located on the inside of the upper chassis frame 11.

[0037] 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 with a foldable chassis, comprising a chassis and a seat post disposed above the chassis, and a support rod assembly supporting the seat post on the chassis; characterized in that: The chassis includes an upper chassis frame and a lower chassis frame stacked on top of each other, as well as a connecting plate. The front end of the connecting plate is rotatably connected to the rear end of the lower chassis frame, and the rear end of the connecting plate is rotatably connected to the middle of the upper chassis frame. The strut assembly includes a first strut and a second strut that are X-shaped and cross-hinged. The first strut includes a first segment and a first rod body. The second strut includes a second segment and a second rod body. The upper end of the first segment is rotatably connected to the bottom front of the seat rod. The lower end of the first segment is rotatably connected to the upper end of the first rod body. The middle part of the first rod body is rotatably connected to the middle part of the second rod body. The lower end of the first rod body is rotatably connected to the middle part of the upper chassis frame. The lower end of the second segment is rotatably connected to the rear of the lower chassis frame. The middle part of the second segment is rotatably connected to the front of the upper chassis frame. The upper end of the second segment is rotatably connected to the lower end of the second rod body. The upper end of the second rod body is rotatably connected to the bottom rear of the seat rod.

2. The foldable wheelchair frame with a foldable chassis according to claim 1, characterized in that: When the foldable wheelchair frame is unfolded, the first segment and the first rod are aligned in a straight line.

3. The foldable wheelchair frame with a foldable chassis according to claim 1, characterized in that: The front end of the second segment bends forward horizontally. When the foldable wheelchair frame is unfolded, the front end of the second segment is flush with the lower chassis frame, and the middle and upper ends of the second segment are aligned with the second rod.

4. The foldable wheelchair frame with a foldable chassis according to claim 1, characterized in that: The rear end of the connecting plate is bent vertically upwards, and when the foldable wheelchair frame is unfolded, the middle and front ends of the connecting plate are flush with the lower chassis frame.

5. The foldable wheelchair frame with a foldable chassis according to claim 1, characterized in that: The foldable wheelchair frame also includes a locking mechanism for locking it in the unfolded state. The locking mechanism includes a hook and a locking plate. The hook is located on either the upper chassis frame or the lower chassis frame, and the locking plate is located on the other. When the hook engages the locking plate, the relative positions of the upper chassis frame and the lower chassis frame are locked, thereby locking the three four-bar linkages.

6. The foldable wheelchair frame with a foldable chassis according to claim 1, characterized in that: The foldable wheelchair frame also includes a backrest rod, the lower part of which is rotatably connected to the rear end of the seat rod. The lower end of the backrest rod is connected to the support rod assembly via a transmission rod assembly. When the backrest rod flips forward, the transmission rod assembly can drive the support rod assembly to move, thereby driving three four-bar linkages to achieve the folding of the foldable wheelchair frame.

7. The foldable wheelchair frame with a foldable chassis according to claim 6, characterized in that: The transmission rod assembly includes a first transmission rod and a second transmission rod. The lower end of the first transmission rod is fixedly connected to the upper end of the second rod, the upper end of the first transmission rod is rotatably connected to the upper end of the second transmission rod, and the lower end of the second transmission rod is rotatably connected to the lower end of the backrest rod, so that the first transmission rod, the second transmission rod, the backrest rod, and the seat rod constitute a fourth four-bar linkage.

8. The foldable wheelchair frame with a foldable chassis according to claim 1, characterized in that: Both the lower chassis frame and the upper chassis frame are U-shaped. The outer side wall of the lower chassis frame is connected to an upwardly extending anti-misalignment plate. The anti-misalignment plate is used to abut against the outer side wall of the upper chassis frame to prevent the upper chassis frame and the lower chassis frame from misaligning in the left-right direction.

9. The foldable wheelchair frame with a foldable chassis according to claim 8, characterized in that: The first rod and the first segment are located on the outside of the lower chassis frame, and the connecting plate is located on the inside of the upper chassis frame.

10. The foldable wheelchair frame with a foldable chassis according to claim 1, characterized in that: The seat rod includes a U-shaped rod with a rear opening and a seat crossbar connected to the rear opening of the U-shaped rod. A transverse support rod is connected to the middle of the first rod located on both sides, and a connecting plate crossbar is connected to the middle of the connecting plate located on both sides.

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