Foldable wheelchair

Abstract

The utility model relates to the technical field of wheelchairs, in particular to a foldable wheelchair which comprises a seat cushion, a backrest and a wheelchair frame, front wheels and rear wheels are installed on the wheelchair frame, and the wheelchair frame comprises a left frame and a right frame which are in mirror image with each other. Each of the left frame and the right frame comprises a first L-shaped rod, a second L-shaped rod fixedly connected with the bottom of the first L-shaped rod, a third L-shaped rod fixedly connected with the corner of the second L-shaped rod, a fourth L-shaped rod fixedly connected with the top end of the third L-shaped rod and a vertical rod fixedly connected with the corner of the fourth L-shaped rod, and the end part of the fourth L-shaped rod is fixedly connected with the middle part of the first L-shaped rod; the front wheel is rotationally connected with the bottom end of the second L-shaped rod, the rear wheel is rotationally connected with the bottom end of the vertical rod, the cushion is rotationally connected with the second L-shaped rod on the left frame, the backrest is rotationally connected with the first L-shaped rod on the right frame, and a first through groove in sliding connection with the second L-shaped rod on the right frame is formed in the bottom face of the cushion.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a foldable wheelchair. Background Art

[0002] A wheelchair is a chair with wheels that can assist with walking. It is an important means of transportation for the injured, sick, and disabled for home rehabilitation, transportation, medical treatment, and outdoor activities. An ordinary wheelchair generally consists of a wheelchair frame, rear wheels, front wheels, a seat cushion, a backrest, armrests, and handles. To meet the requirement for easy portability, people have invented foldable wheelchairs. These wheelchairs typically have a seat cushion and backrest made of a flexible material. Crossbars are then installed on the two wheelchair frames, allowing the left and right front and rear wheels to fold together. To prevent the crossbars from moving under the action of gravity and causing them to fold when a person sits on the wheelchair, a separate locking structure is also designed. However, flexible seat cushions and backrests are not as user-friendly as hard ones. For this reason, people have designed seat cushions and backrests to be detachable. The other structures are the same as those of flexible folding wheelchairs. However, this detachable design also has problems. Since the seat cushions and backrests are separated from the wheelchair frame, they are sometimes easily forgotten or lost.

[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Utility Model Content

[0004] The purpose of the utility model is to design a wheelchair that adopts a hard seat cushion and backrest, can be folded, does not use the existing cross rod and locking structure, and will not be forgotten or lost, so as to solve the above-mentioned shortcomings in the technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a foldable wheelchair, comprising a seat cushion, a backrest, and a wheelchair frame, wherein the wheelchair frame is equipped with front wheels and rear wheels, the wheelchair frame comprising a left frame and a right frame which are mirror images of each other, the left frame and the right frame each comprising a first L-shaped rod, a second L-shaped rod fixedly connected to the bottom of the first L-shaped rod, a third L-shaped rod fixedly connected to the second L-shaped rod at a corner, a fourth L-shaped rod fixedly connected to the top of the third L-shaped rod, and a vertical rod fixedly connected to the corner of the fourth L-shaped rod, the end of the fourth L-shaped rod being connected to the first L-shaped rod The middle portion of the L-shaped rod is fixedly connected, the front wheel is rotatably connected to the bottom end of the second L-shaped rod, the rear wheel is rotatably connected to the bottom end of the vertical rod, the seat cushion is rotatably connected to the second L-shaped rod on the left frame, and the backrest is rotatably connected to the first L-shaped rod on the right frame. A first through-slot is provided on the bottom surface of the seat cushion for sliding connection with the second L-shaped rod on the right frame, and a second through-slot is provided on the side of the backrest away from the front wheel for sliding connection with the first L-shaped rod on the left frame. A storage space for accommodating the seat cushion and the backrest is formed between the first L-shaped rod, the second L-shaped rod, the third L-shaped rod and the fourth L-shaped rod on the left and right frames;

[0006] When the seat cushion and the backrest are rotated from the second L-shaped rod and the first L-shaped rod to the accommodation space respectively, the left frame and the right frame can make the seat cushion and the backrest fit together and fold;

[0007] The user sits on the seat cushion and uses his own weight to prevent the seat cushion from turning upward, thereby preventing the first through slot from separating from the second L-shaped rod on the right frame. After the seat cushion is fitted with the backrest, the backrest is restricted from turning toward the front wheel side.

[0008] Preferably, the cross-sections of the first L-shaped rod and the second L-shaped rod are both circular, and the diameters of the first L-shaped rod and the second L-shaped rod match the first through slot and the second through slot, respectively.

[0009] Preferably, the seat cushion includes a base and a top seat, the top seat is configured as two symmetrically distributed rectangles, and the side of the top seat away from the front wheel is in contact with the side of the backrest.

[0010] Preferably, armrests are fixedly connected to the third L-shaped rods on the left frame and the right frame, and when the seat cushion and the backrest are located in the accommodating space, the seat cushion and the backrest fit in contact with the armrests.

[0011] Preferably, the height of the backrest is greater than that of the third L-shaped rod, and two symmetrically distributed limiting grooves are opened on the backrest, and the fourth L-shaped rods on the left frame and the right frame are slidably connected to the two limiting grooves respectively.

[0012] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0013] 1. This wheelchair is easy to operate and fold by coordinating the seat cushion, backrest, left frame and right frame. By rotating the seat cushion and backrest into the accommodation space, the left frame and right frame can be moved closer to each other for disassembly and folding.

[0014] 2. This wheelchair does not use the cross rod and locking structure in the prior art, and can achieve the folding function and self-locking function of the wheelchair. It has a simple structure, reduces the use of parts and reduces production costs.

[0015] 3. This wheelchair adopts a hard seat cushion and backrest, and improves the structure of the hard seat cushion and backrest. The two are rotatably connected to the left frame and the right frame respectively, and the disassembly method in the existing technology is not adopted, avoiding the problem of forgetting or losing after separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is the first folded view of the utility model;

[0019] Figure 3 This is the folded second view of the utility model;

[0020] Figure 4 This is a three-dimensional diagram of the wheelchair frame of the present invention;

[0021] Figure 5 This is a schematic diagram of the connection between the seat cushion and the backrest of the present invention.

[0022] Description of reference numerals:

[0023] 1. Seat cushion; 1a. Base; 1b. Top seat; 2. Backrest; 3. Wheelchair frame; 3a. Left frame; 3b. Right frame; 3c. First L-shaped rod; 3d. Second L-shaped rod; 3e. Third L-shaped rod; 3f. Fourth L-shaped rod; 3g. Vertical rod; 4. Front wheel; 5. Rear wheel; 6. First through slot; 7. Second through slot; 8. Armrest; 9. Limit slot. DETAILED DESCRIPTION

[0024] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] Example:

[0027] like Figure 1-5As shown, it includes a seat cushion 1, a backrest 2, and a wheelchair frame 3. The wheelchair frame 3 is equipped with a front wheel 4 and a rear wheel 5. The wheelchair frame 3 includes a left frame 3a and a right frame 3b that are mirror images of each other. The left frame 3a and the right frame 3b each include a first L-shaped rod 3c, a second L-shaped rod 3d fixedly connected to the bottom of the first L-shaped rod 3c, a third L-shaped rod 3e fixedly connected to the second L-shaped rod 3d at a corner, a fourth L-shaped rod 3f fixedly connected to the top of the third L-shaped rod 3e, and a vertical rod 3g fixedly connected to the corner of the fourth L-shaped rod 3f. The end of the fourth L-shaped rod 3f is fixedly connected to the middle of the first L-shaped rod 3c. The front wheel 4 is rotatably connected to the bottom end of the second L-shaped rod 3d. The rear wheel 5 is rotatably connected to the bottom end of the vertical rod 3g. The seat cushion 1 is rotatably connected to the second L-shaped rod 3d on the left frame 3a. The backrest 2 is rotatably connected to the first L-shaped rod 3d on the right frame 3b. 3c is rotatably connected, and a first through groove 6 is provided on the bottom surface of the seat cushion 1, which is slidably connected to the second L-shaped rod 3d on the right frame 3b, and a second through groove 7 is provided on the side of the backrest 2 away from the front wheel 4, which is slidably connected to the first L-shaped rod 3c on the left frame 3a. An accommodating space for the seat cushion 1 and the backrest 2 is formed between the first L-shaped rod 3c, the second L-shaped rod 3d, the third L-shaped rod 3e and the fourth L-shaped rod 3f on the left frame 3a and the right frame 3b. The seat cushion 1 includes a base 1a and a top seat 1b, and the top seat 1b is set to two symmetrically distributed rectangles. The side of the top seat 1b away from the front wheel 4 is fitted with the side of the backrest 2. The height of the backrest 2 is greater than the height of the third L-shaped rod 3e. Two symmetrically distributed limiting grooves 9 are provided on the backrest 2, and the fourth L-shaped rod 3f on the left frame 3a and the right frame 3b are slidably connected to the two limiting grooves 9 respectively.

[0028] Disassembly and folding steps: the user flips the seat cushion 1 on the left frame 3a upwards, separates the first through slot 6 from the second L-shaped rod 3d on the right frame 3b, and rotates the seat cushion 1 to the left accommodation space. At this time, the top seat 1b and the base 1a are no longer in contact with the backrest 2. The right frame 3b and the backrest 2 are rotated as a whole around the first L-shaped rod 3c on the left frame 3a, so that the right frame 3b, the backrest 2 and the left frame 3a are parallel. The left frame 3a is then translated to separate the first L-shaped rod 3c on the left frame 3a from the second through slot 7. The backrest 2 is then rotated to flip into the accommodation space on the right frame 3b. Finally, the left frame 3a and the right frame 3b are moved so that the backrest 2 is in contact with the seat cushion 1 and the seat cushion 1 can be disassembled and folded.

[0029] Assembly steps: Reverse the above steps;

[0030] Usage process: When the user sits on the seat cushion 1, the user's own gravity will apply a downward force to the seat cushion 1, so that the second L-shaped rod 3d on the right frame 3b is always located in the first through groove 6. Since the first L-shaped rod 3c on the left frame 3a is located in the second through groove 7 on the backrest 2, the limit groove 9 on the backrest 2 and the fourth L-shaped rod 3f on the left frame 3a are slidably connected, thereby limiting the relative movement of the left frame 3a and the right frame 3b in the vertical direction. Since the top seat 1b on the seat cushion 1 is in contact with the side wall of the backrest 2, the relative movement of the left frame 3a and the right frame 3b in the horizontal direction is limited. Therefore, after assembly, the wheelchair does not need to separately design a locking structure to cooperate with the cross rod in the prior art to achieve the purpose of stable operation.

[0031] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

[0032] Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0033] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A foldable wheelchair comprising a seat cushion (1), a backrest (2), and a wheelchair frame (3), wherein the wheelchair frame (3) is provided with front wheels (4) and rear wheels (5), characterized in that: The wheelchair frame (3) comprises a left frame (3a) and a right frame (3b) that are mirror images of each other, and both the left frame (3a) and the right frame (3b) comprise a first L-shaped rod (3c), a second L-shaped rod (3d) fixedly connected to the bottom of the first L-shaped rod (3c), a third L-shaped rod (3e) fixedly connected to the second L-shaped rod (3d) at a folded corner, a fourth L-shaped rod (3f) fixedly connected to the top of the third L-shaped rod (3e), and a vertical rod (3g) fixedly connected to the folded corner of the fourth L-shaped rod (3f), the end of the fourth L-shaped rod (3f) is fixedly connected to the middle of the first L-shaped rod (3c), the front wheel (4) is rotatably connected to the bottom end of the second L-shaped rod (3d), and the rear wheel (5) is rotatably connected to the bottom end of the vertical rod (3g). The two ends are rotatably connected, the seat cushion (1) is rotatably connected to the second L-shaped rod (3d) on the left frame (3a), and the backrest (2) is rotatably connected to the first L-shaped rod (3c) on the right frame (3b); a first through groove (6) is provided on the bottom surface of the seat cushion (1) and is slidably connected to the second L-shaped rod (3d) on the right frame (3b); a second through groove (7) is provided on the side of the backrest (2) away from the front wheel (4) and is slidably connected to the first L-shaped rod (3c) on the left frame (3a); and an accommodating space for accommodating the seat cushion (1) and the backrest (2) is formed between the first L-shaped rod (3c), the second L-shaped rod (3d), the third L-shaped rod (3e) and the fourth L-shaped rod (3f) on the left frame (3a) and the right frame (3b); When the seat cushion (1) and the backrest (2) are rotated from the second L-shaped rod (3d) and the first L-shaped rod (3c) to the accommodation space, the left frame (3a) and the right frame (3b) can mutually fit and fold the seat cushion (1) and the backrest (2); The user sits on the seat cushion (1) and uses his own weight to prevent the seat cushion (1) from turning upward, thereby preventing the first through groove (6) from separating from the second L-shaped rod (3d) on the right frame (3b). After the seat cushion (1) is fitted with the backrest (2), the backrest (2) is restricted from turning toward the front wheel (4).

2. A foldable wheelchair according to claim 1, characterized in that: The cross sections of the first L-shaped rod (3c) and the second L-shaped rod (3d) are both circular, and the diameters of the first L-shaped rod (3c) and the second L-shaped rod (3d) match the first through slot (6) and the second through slot (7), respectively.

3. The foldable wheelchair according to claim 1, characterized in that: The seat cushion (1) comprises a base (1a) and a top seat (1b); the top seat (1b) is configured as two symmetrically distributed rectangles; a side of the top seat (1b) away from the front wheel (4) is in contact with a side surface of the backrest (2).

4. The foldable wheelchair according to claim 1, characterized in that: The third L-shaped rods (3e) on the left frame (3a) and the right frame (3b) are both fixedly connected with armrests (8); when the seat cushion (1) and the backrest (2) are located in the accommodation space, the seat cushion (1) and the backrest (2) fit in contact with the armrests (8).

5. The foldable wheelchair according to claim 1, characterized in that: The height of the backrest (2) is greater than the height of the third L-shaped rod (3e), and two symmetrically distributed limiting grooves (9) are opened on the backrest (2). The fourth L-shaped rod (3f) on the left frame (3a) and the right frame (3b) are respectively slidably connected to the two limiting grooves (9).

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