A foldable wheelchair

Abstract

The application discloses a foldable wheelchair, which comprises a backrest assembly, a front frame assembly, a rear frame assembly, a seat rod assembly, a seat rod connecting rod, a front frame connecting rod and a self-locking assembly; the seat rod assembly, the backrest assembly, the rear frame assembly and the seat rod connecting rod form a first quadrilateral folding structure; the front frame assembly, the rear frame assembly, the front frame connecting rod and the seat rod connecting rod form a second quadrilateral folding structure; and the self-locking assembly is installed on the rear frame assembly and used for locking the backrest assembly, the rear frame assembly and the seat rod connecting rod. The various movable assemblies in the application are combined to form two foldable quadrilateral structures, and the folding of the whole wheelchair is controlled through a self-locking assembly, so that the folding structure is greatly simplified, the folding of the whole wheelchair can be realized through the operation of one self-locking assembly, the use is more simple and labor-saving, and the height of the folded wheelchair is only half of the original height, so that the occupied space is greatly reduced.

Description

Technical Field

[0001] This invention relates to the technical field of wheelchairs, and particularly to a foldable wheelchair. Background Technology

[0002] Wheelchairs are an important tool for rehabilitation. They are not only a means of transportation for people with physical disabilities, but more importantly, they enable them to exercise and participate in social activities. A typical wheelchair consists of a frame, wheels, brakes, and a seat.

[0003] Wheelchairs are generally quite large, and are typically folded to reduce their size for easier storage. However, existing folding wheelchair frame designs are quite complex, involving multiple folding movements and requiring considerable effort to fold. Therefore, existing folding wheelchairs present some inconvenience for people with mobility impairments or the elderly. Summary of the Invention

[0004] In view of the defects or deficiencies in the existing technology, the present invention aims to provide a foldable wheelchair that is structurally stable, safe to use, and easy and convenient to fold.

[0005] The purpose of this application is achieved through the following technical solution:

[0006] A foldable wheelchair includes a backrest assembly, a front frame assembly, a rear frame assembly, a seat post assembly, a seat post link, a front frame link, and a self-locking assembly. The rear end of the seat post assembly is hinged to the middle of the backrest assembly, the upper end of the rear frame assembly is hinged to the lower end of the backrest assembly, and both ends of the seat post link are hinged to the front of the seat post assembly and the upper part of the rear frame assembly, respectively. The seat post assembly, backrest assembly, rear frame assembly, and seat post link form a first quadrilateral folding structure. The rear end of the front frame assembly is hinged to the upper part of the rear frame assembly, and both ends of the front frame link are hinged to the middle of the seat post link and the front of the front frame assembly, respectively. The front frame assembly, rear frame assembly, front frame link, and seat post link form a second quadrilateral folding structure. The self-locking assembly is mounted on the rear frame assembly to lock the backrest assembly, rear frame assembly, and seat post link.

[0007] Preferably, the backrest assembly and seat post assembly are both U-shaped tubes, and the rear frame assembly is an H-shaped tube; two first hinge parts are provided between the upper end of the rear frame assembly and the lower end of the backrest assembly, and the self-locking assembly is located between the two first hinge parts.

[0008] Preferably, the self-locking assembly includes an unlocking lever, a locking hook, a torsion spring, and a limiting pin. The two ends of the unlocking lever are rotatably connected to two first hinge parts via the locking hook. The locking hook includes a rotating part and a hook. The rotating part is rotatably connected to the first hinge part via the torsion spring. The rotating part is provided with a limiting groove. The limiting pin passes through the first hinge part from the outside and engages with the limiting groove. The hook engages with a locking boss on the seat rod connecting rod below.

[0009] Preferably, the upper part of the backrest assembly is connected to an armrest assembly, and the armrest assembly and the rear end are rotatably connected to the backrest assembly via a self-locking mechanism. The armrest assembly and the seat post assembly are arranged in parallel.

[0010] Preferably, the front wheel assembly is installed at the front end of the front frame assembly, and the rear wheel assembly is installed at the rear end of the front frame assembly.

[0011] Preferably, the front end of the front frame assembly is foldable and connected to the foot pedal assembly.

[0012] Preferably, the front frame assembly is a U-shaped tube, and a connecting rod shaft is provided between the two parallel tubes of the front frame assembly. The front frame connecting rod is fixedly connected to the connecting rod shaft, and the connecting rod shaft is rotatably connected to the two parallel tubes of the front frame assembly.

[0013] Preferably, the rear frame assembly has a second hinge portion on its inner side, and the rear end of the front frame assembly and the lower end of the seat post link are connected to the rear frame assembly through the second hinge portion.

[0014] Compared with the prior art, this application has at least the following obvious advantages and effects:

[0015] The various active components in this invention combine to form two foldable quadrilateral structures, and the folding of the entire wheelchair is controlled by a self-locking component, which greatly simplifies the folding structure. The entire wheelchair can be folded by operating a single self-locking component, making it simpler and less strenuous to use. Moreover, the height of the folded wheelchair is only half of its original height, which greatly reduces the space it occupies. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural view of the present invention;

[0017] Figure 2 This is another three-dimensional view of the present invention;

[0018] Figure 3 This is a side view of the present invention;

[0019] Figure 4 This is a schematic diagram of the folding process of the present invention;

[0020] Figure 5 This is a schematic diagram of the folded structure of the present invention;

[0021] Figure 6 This is a connection structure diagram of the self-locking component of the present invention;

[0022] Figure 7 for Figure 6 The structural sectional view in the middle;

[0023] Figure 8 This is a schematic diagram of the locking hook structure in this invention.

[0024] The following are the component lists in this application: 1. Backrest assembly; 2. Front frame assembly; 3. Rear frame assembly; 4. Seatpost assembly; 5. Seatpost link; 6. Front frame link; 7. Self-locking assembly; 8. First hinge; 9. Armrest assembly; 10. Rotating self-locking component; 11. Front wheel assembly; 12. Rear wheel assembly; 13. Foot pedal assembly; 14. Linkage pivot; 15. Second hinge; 71. Unlocking lever; 72. Locking hook; 73. Torsion spring; 74. Limit pin; 75. Locking boss; 721. Rotating component; 722. Hook; 723. Limiting groove. Detailed Implementation

[0025] Specific embodiments of this application have been described in conjunction with the accompanying drawings and the following description to teach those skilled in the art how to make and use this application. For the purpose of teaching the principles of the application, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that variations derived from these embodiments fall within the scope of this application. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of this application. Terms such as “upper,” “lower,” “left,” “right,” “middle,” and “a” used in this application are merely for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. Therefore, this application is not limited to the specific embodiments described below, but only to the claims and their equivalents.

[0026] like Figure 1 and Figure 2 As shown, this embodiment relates to a foldable wheelchair, which includes a backrest assembly 1, a front frame assembly 2, a rear frame assembly 3, a seat post assembly 4, a seat post connecting rod 5, a front frame connecting rod 6, and a self-locking assembly 7. The rear end of the seat post assembly 4 is hinged to the middle of the backrest assembly 1, the upper end of the rear frame assembly 3 is hinged to the lower end of the backrest assembly 1, and both ends of the seat post connecting rod 5 are hinged to the front of the seat post assembly 4 and the upper part of the rear frame assembly 3, respectively. The seat post assembly 5, the backrest assembly 1, the rear frame assembly 3, and the seat post connecting rod 5 form a first quadrilateral folding structure abcd (see reference). Figure 3The rear end of the front frame assembly 6 is hinged to the upper part of the rear frame assembly 3, and both ends of the front frame link 6 are hinged to the middle part of the seat post link 5 and the front part of the front frame assembly 2, respectively. The front frame assembly 2, the rear frame assembly 3, the front frame link 6, and the seat post link 5 form a second quadrilateral folding structure efgh (reference). Figure 3 The self-locking component 7 is installed on the rear frame assembly 3 to lock the backrest assembly 1, the rear frame assembly 3 and the seat post link 5.

[0027] In the embodiments of this application, the backrest assembly 1 and the seat post assembly 4 are both U-shaped tubes, and the rear frame assembly 3 is an H-shaped tube; therefore, the backrest assembly 1 is connected to the seat post assembly 4 and the rear frame assembly 3 through two points. Two first hinge parts 8 are provided between the upper end of the rear frame assembly 3 and the lower end of the backrest assembly 1, and the self-locking assembly 7 is provided between the two first hinge parts 8.

[0028] Specifically, such as Figures 6 to 8 As shown, the self-locking assembly 7 includes an unlocking lever 71, a locking hook 72, a torsion spring 73, a limiting pin 74, and a locking boss 75. The two ends of the unlocking lever 71 are rotatably connected to two first hinge parts 8 via the locking hook 72. The locking hook 72 includes a rotating part 721 and a hook 722. The rotating part 721 is rotatably connected to the first hinge part 8 via the torsion spring 73. The rotating part 721 has a limiting groove 723. The limiting pin 74 passes through the first hinge part 8 from the outside and engages with the limiting groove 723. The locking boss is located on the seat rod connecting rod. On one hand, by inserting the limiting pin 74, the first hinge part 8 cannot rotate, thus locking the backrest assembly 1 and the rear frame assembly 3, preventing them from rotating and folding. On the other hand, by hooking the locking boss 75 below with the hook 722, the seat rod connecting rod 5 is locked, allowing the four components in the first quadrilateral folding structure abcd to be supported.

[0029] like Figure 1 and Figure 2 As shown, the upper part of the backrest assembly 1 is connected to the armrest assembly 9. The armrest assembly 9 is rotatably connected to the backrest assembly 1 via a rotating self-locking member 10. The armrest assembly 9 is arranged parallel to the seat post assembly 4. The rotating self-locking member 10 is similar to the locking structure of the limiting pin 74 in the self-locking assembly 7, which can realize the folding of the armrest assembly 9. The front wheel assembly 11 is installed at the front end of the front frame assembly 2, and the rear wheel assembly 12 is installed at the rear end of the front frame assembly 2. In addition, the front end of the front frame assembly 2 is connected to the foot pedal assembly 13 by a hinge. The foot pedal assembly 13 can be flipped and folded backward, thereby reducing the space occupied by the wheelchair after folding.

[0030] In the embodiments of this application, the front frame assembly 2 is a U-shaped tube, and a connecting rod shaft 14 is provided between the two parallel tubes of the front frame assembly 2. The front frame connecting rod 6 is fixedly connected to the connecting rod shaft 14, and the connecting rod shaft 14 is rotatably connected to the two parallel tubes of the front frame assembly 2. The connecting rod shaft 14 can also improve the stability and safety of the structure. A connecting rod for stabilizing the structure is also provided between the two parallel tubes of the seat post assembly 4.

[0031] The rear frame assembly 3 has a second hinge portion 15 on its inner side, and the second hinge portion 15 has two hinge points a / e and h (e.g., Figure 3 As shown, the rear end of the front frame assembly 2 and the lower end of the seat post link 5 are connected to the rear frame assembly 3 through the second hinge part 15. The front frame assembly 2 is hinged at hinge point h, and the seat post link 5 is hinged at hinge point a / e. Hinge point h is located below hinge point a / e.

[0032] The folding principle of this invention is:

[0033] like Figure 4 and Figure 5 As shown, during folding, the limiting pin 74 is removed from the limiting slot 723, releasing the rotation restriction of the first hinge 8 of the backrest assembly 1 and the rear frame assembly 3. The backrest assembly 1 and the rear frame assembly 3 can simultaneously rotate inward and fold. Additionally, the unlocking lever 71 can be rotated, causing the locking hook 72 to disengage from the locking boss 75. The seat post link 5 is also released from rotation restriction, allowing rotational folding between the seat post link 5, the seat post assembly 4, and the frame assembly 3. The first quadrilateral folding structure abcd folds, while the second quadrilateral folding structure efgh, located below the first quadrilateral folding structure abcd, has no locking restriction and can fold itself. When the first quadrilateral folding structure abcd folds, the wheelchair loses its stable support structure, and the second quadrilateral folding structure efgh automatically folds under gravity. Furthermore, other components such as the armrest assembly 9 and the footrest assembly 13 can be folded individually.

[0034] As those skilled in the art will readily conceive, any modifications, equivalent substitutions, improvements, etc., made using the concept and principles of this application should be included within the scope of the claims of this application.

Claims

1. A foldable wheelchair, characterized in that, It includes a backrest assembly, a front frame assembly, a rear frame assembly, a seat post assembly, a seat post connecting rod, a front frame connecting rod, and a self-locking assembly; the rear end of the seat post assembly is hinged to the middle of the backrest assembly, the upper end of the rear frame assembly is hinged to the lower end of the backrest assembly, and the two ends of the seat post connecting rod are respectively hinged to the front of the seat post assembly and the upper part of the rear frame assembly. The seat post assembly, backrest assembly, rear frame assembly, and seat post connecting rod form a first quadrilateral folding structure. The rear end of the front frame assembly is hinged to the upper part of the rear frame assembly. The two ends of the front frame link are respectively hinged to the middle part of the seat post link and the front part of the front frame assembly. The front frame assembly, the rear frame assembly, the front frame link and the seat post link form a second quadrilateral folding structure. The self-locking component is installed on the rear frame assembly to lock the backrest assembly, the rear frame assembly and the seat post link. The backrest assembly and seat post assembly are both U-shaped tubes, and the rear frame assembly is an H-shaped tube; two first hinge parts are provided between the upper end of the rear frame assembly and the lower end of the backrest assembly, and the self-locking assembly is located between the two first hinge parts; The rear frame assembly has a second hinge on its inner side, and the rear end of the front frame assembly and the lower end of the seat rod are connected to the rear frame assembly through the second hinge. The self-locking assembly includes an unlocking lever, a locking hook, a torsion spring, and a limiting pin. The two ends of the unlocking lever are rotatably connected to two first hinge parts via the locking hook. The locking hook includes a rotating part and a hook. The rotating part is rotatably connected to the first hinge part via the torsion spring. The rotating part is provided with a limiting groove. The limiting pin passes through the first hinge part from the outside and engages with the limiting groove. The hook engages with a locking boss on the seat rod connecting rod below. When folding, remove the limiting pin from the limiting slot, and the backrest assembly and the rear frame assembly rotate inward and fold simultaneously. Rotate the unlocking lever to disengage the locking hook from the locking boss, and the seat post connecting rod rotates and folds between the seat post assembly and the frame assembly. The first quadrilateral folding structure folds. After the first quadrilateral folding structure is folded, the wheelchair loses its stable support structure, and the second quadrilateral folding structure automatically folds under the action of gravity.

2. The foldable wheelchair according to claim 1, characterized in that, The upper part of the backrest assembly is connected to the armrest assembly, and the armrest assembly and the rear end are rotatably connected to the backrest assembly through a rotating self-locking component. The armrest assembly and the seat rod assembly are arranged parallel to each other.

3. The foldable wheelchair according to claim 1, characterized in that, The front wheel assembly is mounted on the front end of the front frame assembly, and the rear wheel assembly is mounted on the rear end of the front frame assembly.

4. The foldable wheelchair according to claim 1, characterized in that, The front end of the aforementioned front frame assembly can be folded to connect to the foot pedal assembly.

5. The foldable wheelchair according to claim 1, characterized in that, The front frame assembly is a U-shaped tube, and a connecting rod shaft is provided between the two parallel tubes of the front frame assembly. The front frame connecting rod is fixedly connected to the connecting rod shaft, and the connecting rod shaft is rotatably connected to the two parallel tubes of the front frame assembly.

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