A foldable wheelchair
By using independent backrest frame, seat frame, and armrest frame, combined with a scissor folding mechanism and a pin pull rope design, the problem of complex structure and large space occupation of existing foldable wheelchairs is solved, achieving convenient folding and improving usability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU INTCO MEDICAL PROD CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-06-12
Smart Images
Figure CN224345096U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of wheelchair technology, specifically, it relates to a foldable wheelchair. Background Technology
[0002] As an assistive medical device, wheelchairs are increasingly being used in people's daily lives. For the elderly with mobility difficulties and patients with leg ailments, wheelchairs have become an indispensable tool.
[0003] However, wheelchairs are quite large. Considering factors such as comfort, safety, and stability, their volume during use is usually larger than that of a regular chair with a backrest. This means that when wheelchairs are not needed for storage, they often occupy a lot of space and cannot be stacked or placed at a high place, resulting in an entire area being occupied by wheelchairs.
[0004] Based on these issues, subsequent research and development have resulted in the creation of foldable wheelchair structures. When not in use, users can fold the wheelchair to reduce its overall size, making it easier to store.
[0005] However, the existing foldable wheelchair structures have a primary problem: to achieve the foldable design, additional redundant and complex structures are incorporated. This not only increases the price and cost of the wheelchair but also makes the folding components more prone to damage, requiring frequent and repeated repairs. Furthermore, some folding components are not very convenient for users to operate, making them quite cumbersome. Utility Model Content
[0006] To address the aforementioned problems in the existing technology, the purpose of this utility model is to provide a foldable wheelchair that is easy to fold and unfold, saves space, and has a simple and lightweight structure.
[0007] To solve the above problems, the technical solution adopted by this utility model is as follows:
[0008] A foldable wheelchair includes a backrest frame that is independently set apart and serves only as a backrest, a seat frame that serves only as a seat, and an armrest frame that serves only as an armrest.
[0009] It also includes a folding mechanism, which includes a first folding arm and a second folding arm that are respectively arranged on the left and right sides;
[0010] The top end of the first folding arm is rotatably connected to the front end of the seat frame, and the bottom end of the first folding arm is rotatably connected to a rear wheel;
[0011] The top end of the second folding arm is rotatably connected to the bottom end of the backrest frame, and the bottom end of the second folding arm is rotatably connected to a front wheel;
[0012] The first and second folding arms, located on the same side, are arranged to cross each other and are rotatably connected to each other;
[0013] The top of the second folding arm is fixedly connected to the bottom of the backrest frame by an interference fit and a movable locking pin. There are two pins on the left and right sides respectively, and a pull rope is connected between the two pins.
[0014] The armrest frame and the backrest frame are rotatably connected;
[0015] A support arm is connected between the handrail frame and the seat frame, and the support arm is rotatably connected to both the handrail frame and the seat frame.
[0016] Furthermore, the second folding arm is located on the inner side of the backrest frame.
[0017] Furthermore, the top of the second folding arm provides movable support for the seat frame.
[0018] Furthermore, the bottom rear end of the seat frame is provided with an inner groove with a vertical cross-section in the shape of an arc, and the top end of the second folding arm is provided with a support block, on which a support part is formed that matches the shape and size of the inner groove.
[0019] Furthermore, the first and second folding arms tend to be horizontal near their bottom ends.
[0020] Furthermore, it also includes a battery box assembly;
[0021] The battery box assembly includes a battery and a box body that are detachably connected to each other, and the box body is also fixedly connected to the first folding arm.
[0022] Furthermore, a third folding arm is rotatably connected to the inner side of the first folding arm. The top end of the third folding arm is rotatably connected to the first folding arm, and the bottom end is rotatably connected to an auxiliary wheel, which is located behind the rear wheel.
[0023] The top end of the third folding arm is rotatably connected to the first folding arm, the bottom end of the connecting arm is rotatably connected to the top end of the third folding arm, the top end of the connecting arm is rotatably connected to a connecting piece, and the connecting piece is rotatably connected to the rear end of the seat frame and the bottom end of the backrest frame.
[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0025] (1) The overall structure of this utility model is simple and ingenious. When users need to fold it, they do not need to perform complicated operations. They only need to pull the pull rope. When they need to unfold it, they only need to insert the pins on both sides to lock it.
[0026] (2) The present invention adopts the design of auxiliary wheels, which can play an auxiliary support role when climbing slopes. After the wheelchair is folded up, the auxiliary wheels can be transformed into support wheels to facilitate the user to drag the folded wheelchair, thus improving the practical performance.
[0027] (3) The present invention is designed with a support part that can play an auxiliary support role. When the wheelchair is unfolded, it can play an auxiliary support role for the rear end of the seat frame. During the folding process, the support part can also rotate flexibly without affecting the normal operation of the folding process. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall structure of the foldable wheelchair described in this utility model when unfolded;
[0029] Figure 2 This is a schematic diagram of a half-section of the wheelchair when it is unfolded.
[0030] Figure 3 This is another schematic diagram of the overall structure of the wheelchair when it is unfolded;
[0031] Figure 4 for Figure 3 A schematic diagram of the local structure at point A in the middle;
[0032] Figure 5 This is another schematic diagram of the overall structure of the wheelchair when it is unfolded;
[0033] Figure 6 for Figure 5 A schematic diagram of the local structure at point B;
[0034] Figure 7 This is a schematic diagram of the internal structure of the latch.
[0035] Figures 8-11 A schematic diagram illustrating the changes in a wheelchair during the folding process;
[0036] Figure 12 This is a structural schematic diagram of the battery box assembly;
[0037] Figure 13 This is a structural diagram of the box.
[0038] Figure 14 This is a schematic diagram of the battery structure;
[0039] In the diagram: 1-Backrest frame; 2-Seat frame; 21-Inner groove; 3-Armrest frame; 31-Support arm; 4-Folding mechanism; 41-First folding arm; 42-Second folding arm; 43-Support block; 44-Support part; 45-Third folding arm; 46-Auxiliary wheel; 47-Connecting arm; 48-Connecting piece; 5-Rear wheel; 6-Front wheel; 7-Pin; 8-Pull cord; 9-Battery box assembly; 91-Battery; 92-Box body. Detailed Implementation
[0040] The present invention will be further described below with reference to specific embodiments.
[0041] Example 1:
[0042] like Figures 1-4 As shown, the foldable wheelchair of this utility model includes a backrest frame 1, which is independently configured and serves only as a backrest; a seat frame 2, which serves only as a seat; and an armrest frame 3, which serves only as an armrest. A key technical point in this embodiment is that the backrest frame 1 is used only as a backrest, the seat frame 2 as a seat, and the armrest frame 3 as an armrest. This design fully addresses the shortcomings of existing technologies, namely, complex folding operations and redundant structural components. More importantly, only by combining this design with the subsequent design in this embodiment can the intended technical effect of this solution be achieved.
[0043] In some other foldable wheelchairs on the market, the backrest, seat, and armrests often have interlocking structures, with parts of one component embedded inside another, creating an overlapping effect. Such designs often prioritize structural strength over the essential folding characteristic. Only through proper coordination and cooperation between the various structural components can a wheelchair achieve a suitable size and convenient, quick folding.
[0044] Based on this, this embodiment further designs a folding mechanism 4, which mainly includes two first folding arms 41 and two second folding arms 42 respectively arranged on the left and right sides. From the inside out, the components are the first folding arms 41, the second folding arms 42, and the backrest frame 1. The top ends of the two first folding arms 41 are rotatably connected to the front end of the seat frame 2, and the bottom ends are rotatably connected to rear wheels 5. The top ends of the two second folding arms 42 are rotatably connected to the bottom end of the backrest frame 1, and the bottom ends are rotatably connected to front wheels 6. Furthermore, the first folding arms 41 and second folding arms 42 on the same side are arranged crosswise and rotatably connected to each other. Thus, the first folding arms 41 and second folding arms 42 on the same side constitute a crosswise scissor-type folding mechanism 4, thereby enabling the seat frame 2 to fold downwards, i.e., towards the ground.
[0045] It should be noted that, based on the usage environment and the overall size after folding, in this embodiment, the first folding arm 41 and the second folding arm are more horizontal near the bottom, or in other words, they form a section that is close to horizontal. This can minimize the distance between the folded seat frame 2 and the front wheel 6 and the rear wheel 5, thereby saving space.
[0046] In addition, in this embodiment, each of the two rear wheels 5 is equipped with a drive device, while the front wheel 6 is rotatably connected to the second folding arm 42 via an adapter plate and a bearing.
[0047] Finally, the armrest frame 3 and the backrest frame 1 are also rotatably connected, and a support arm 31 is connected between the armrest frame 3 and the seat frame 2. The support arm 31 is rotatably connected to both the armrest frame 3 and the seat frame 2.
[0048] At this point, we can construct the basic structure of the foldable wheelchair. Using the seat frame 2 as a dividing line, pressing down on the backrest frame 1 causes it to tilt. Supported by the second folding arm 42, the front end of the backrest frame 1 falls and becomes horizontal, eventually resting on the seat frame 2. Simultaneously, the support arm 31 rotates in conjunction with the armrest frame 3, causing it to also become horizontal and lie flat on the outside of the seat frame 2. The armrest frame 3 then follows the tilted backrest frame 1, resting on the seat frame 2, thus completing the folding of the components above the seat frame 2.
[0049] Below the seat frame 2, the top of the first folding arm 41, which is folded in a scissor-like manner, falls down to the bottom of the second folding arm 42, while the top of the second folding arm 42 also falls down simultaneously to the bottom of the first folding arm 41, thus completing the folding of the components below the seat frame 2.
[0050] The above describes the folding process in detail. It is evident that initiating the folding process requires pushing the backrest frame 1. After pushing the backrest frame 1, it rotates relative to the second folding arm 42. Therefore, under normal use, a locking mechanism is necessary between the backrest frame 1 and the second folding arm 42 to prevent them from rotating naturally.
[0051] The locking mechanism must be quick and convenient in its unlocking and locking processes.
[0052] like Figure 7 As shown, in this embodiment, the locking mechanism includes a pin 7 that passes through both the top end of the second folding arm 42 and the bottom end of the backrest frame 1, and is respectively provided on both sides. The pin 7 has a portion at its tail located outside the second folding arm 42, which is a length that allows the user to hold it directly.
[0053] Slots are provided in the second folding arm 42 and the backrest frame 1. The pin 7 is made of elastic material. During installation, the pin 7 needs to pass through the second folding arm 42 first, and then enter the backrest frame 1. For limiting its movement, the pin 7 has a relatively protruding part in the middle. This protruding part can be inserted into the second folding arm 42 and the backrest frame 1 during installation. The second folding arm 42 has a corresponding limiting part that can block the protruding part, preventing it from coming out of the slot. Furthermore, the pin 7 is movable and lockable. That is, when the user pulls the pin 7 outward, it can disengage from the slot in the backrest frame 1, but cannot disengage from the slot in the second folding arm 42. This releases the lock between the second folding arm 42 and the backrest frame 1, allowing the user to push the backrest frame 1 to rotate and fold.
[0054] To facilitate locking and unlocking for the user, a pull rope 8 is connected between the ends of the two pins 7 in this embodiment. When the wheelchair is fully extended, the pull rope 8 is taut, and the two pins 7 are locked in their slots with an interference fit. When the user needs to fold the wheelchair, simply pull the pull rope 8, causing the ends of the pins 7 to be pulled outwards. The pins 7 then disengage from the slots in the backrest frame 1 and are locked into the slots in the second folding arm 42, preventing the pull rope 8 from falling out. After disengagement, the second folding arm 42 locks into contact with the backrest frame 1, allowing the user to rotate and fold the backrest frame 1. When the user needs to return the wheelchair to its usable state, simply rotate the backrest frame 1 into place and then manually push the pins 7 into their slots.
[0055] One major problem with existing technologies is that the traditional latch structure used in foldable wheelchairs often has to bear most of the load. After prolonged use or if it is not properly engaged during use, the risk of damage increases significantly, leading to latch failure and rendering the wheelchair unusable.
[0056] Example 2:
[0057] like Figures 5-6 As shown, the foldable wheelchair of this utility model has the same structure as that in Embodiment 1. The difference is that a vertically shaped arc-shaped inner groove 21 is provided at the bottom of the rear end of the seat frame 2. At the same time, a support block 43 is provided at the top of the second folding arm 42. A support part 44 matching the shape and size of the inner groove 21 is formed on the support block 43. The support part 44 can always be locked in the inner groove 21 during the folding process.
[0058] In existing technologies, traditional wheelchairs, in order to achieve a foldable design, often make each component as independent and detachable as possible. This results in insufficient support at the rear end of the seat, making it prone to collapse during use. To address this issue, this application combines the independent backrest frame 1 and seat frame 2 structures, designing a movable support groove 21 and support part 44. When the wheelchair is unfolded, the support part 44 supports the rear end of the seat frame 2 (the groove 21), improving overall structural strength. During folding, as the seat frame 2 moves forward along with the backrest frame 1, the support part 44 smoothly disengages from the groove 21, completing the folding process and achieving a perfect balance between space utilization and performance.
[0059] Figures 8-11 This demonstrates the process of the wheelchair structure described in this utility model changing from unfolding to folding.
[0060] Example 3:
[0061] In this embodiment, the main body can be the same as the structure in Embodiment 1 or Embodiment 2, except that the foldable wheelchair also includes a battery box assembly 9, such as... Figure 12-14 As shown, the battery box assembly 9 includes a battery 91 and a box body 92 that are detachably connected to each other, and the box body 92 is also fixedly connected to the first folding arm 41.
[0062] In this embodiment, a battery 91 is used for power supply, which allows users to control the wheelchair's forward, backward, turning, and stopping actions through the controller set on the armrest frame 3. The detachable connection between the battery 91 and the housing 92 makes it convenient for users to charge and replace the battery 91, thus improving its practicality.
[0063] Furthermore, as can be seen from the figure, a locking component is also provided inside the battery and component 9 used in this embodiment. A push-out opening 921 is provided on the side of the housing 92, and a corresponding rotatable and spring-loaded latch 911 is provided on the side of the battery 91, thereby realizing a detachable connection between the battery 91 and the housing 92.
[0064] Example 4:
[0065] In this embodiment, the main body can be the same as the structure in Embodiment 1, Embodiment 2 or Embodiment 3. The difference is that a third folding arm 45 is rotatably connected to the inner side of the first folding arm 41. The top end of the third folding arm 45 is rotatably connected to the first folding arm 41, and the bottom end is rotatably connected to an auxiliary wheel 46. There are two auxiliary wheels 46, which are located behind the rear wheel 5.
[0066] Therefore, the design of the auxiliary wheels 46 allows them to provide support when the user is climbing hills in a wheelchair, reducing the risk of tipping over. Furthermore, when the wheelchair is fully folded, the user can carry the backrest frame 1 by hand and drag it; in this case, the auxiliary wheels 46 become the bottom support wheels, facilitating the movement of the wheelchair.
[0067] In this embodiment, the top end of the third folding arm 45 is rotatably connected to the first folding arm 41 with a connecting arm 47. The bottom end of the connecting arm 47 is rotatably connected to the top end of the third folding arm 45. The top end of the connecting arm 47 is rotatably connected to a connecting member 48. The connecting member 48 is rotatably connected to the rear end of the seat frame 2 and the bottom end of the backrest frame 1. Thus, the design of the connecting member 48 satisfies the folding action of the third folding arm 45. The connecting member 48 coordinates the transmission between the third folding arm 45, the seat frame 2, and the backrest frame 1, further ensuring the smooth and reasonable operation of the folding process while saving space.
Claims
1. A foldable wheelchair, characterized in that, This includes backrest frames that are independently set up and only serve as backrests, seat frames that only serve as seats, and armrest frames that only serve as armrests; It also includes a folding mechanism, which includes a first folding arm and a second folding arm that are respectively arranged on the left and right sides; The top end of the first folding arm is rotatably connected to the front end of the seat frame, and the bottom end of the first folding arm is rotatably connected to a rear wheel; The top end of the second folding arm is rotatably connected to the bottom end of the backrest frame, and the bottom end of the second folding arm is rotatably connected to a front wheel; The first and second folding arms, located on the same side, are arranged to cross each other and are rotatably connected to each other; The top of the second folding arm is fixedly connected to the bottom of the backrest frame by an interference fit and a movable locking pin. There are two pins on the left and right sides respectively, and a pull rope is connected between the two pins. The armrest frame and the backrest frame are rotatably connected; A support arm is connected between the handrail frame and the seat frame, and the support arm is rotatably connected to both the handrail frame and the seat frame.
2. The foldable wheelchair according to claim 1, characterized in that, The second folding arm is located on the inside of the backrest frame.
3. The foldable wheelchair according to claim 1, characterized in that, The top of the second folding arm provides movable support for the seat frame.
4. The foldable wheelchair according to claim 3, characterized in that, The bottom rear end of the seat frame is provided with an inner groove with a vertical cross-section in the shape of an arc. The top end of the second folding arm is provided with a support block, and a support part is formed on the support block that matches the shape and size of the inner groove.
5. The foldable wheelchair according to claim 1, characterized in that, The first and second folding arms tend to be horizontal near their bottom ends.
6. The foldable wheelchair according to claim 1, characterized in that, It also includes the battery box assembly; The battery box assembly includes a battery and a box body that are detachably connected to each other, and the box body is also fixedly connected to the first folding arm.
7. The foldable wheelchair according to any one of claims 1-6, characterized in that, A third folding arm is rotatably connected to the inside of the first folding arm. The top end of the third folding arm is rotatably connected to the first folding arm, and the bottom end is rotatably connected to an auxiliary wheel, which is located behind the rear wheel. The top end of the third folding arm is rotatably connected to the first folding arm, the bottom end of the connecting arm is rotatably connected to the top end of the third folding arm, the top end of the connecting arm is rotatably connected to a connecting piece, and the connecting piece is rotatably connected to the rear end of the seat frame and the bottom end of the backrest frame.