Foldable wheelchair

Abstract

The invention belongs to the technical field of wheelchairs, and particularly relates to a foldable wheelchair which comprises a backrest frame body, a seat plate frame body, armrest frame bodies and a folding mechanism, the folding mechanism comprises a first folding arm and a second folding arm, the top end of the first folding arm is rotationally connected with the front end of the seat plate frame body, and the top end of the second folding arm is rotationally connected with the bottom end of the backrest frame body; the top of the second folding arm is fixedly connected with the bottom of the backrest frame body through bolts which are in interference fit and can be movably locked, the left bolt and the right bolt are correspondingly arranged, and a pull rope is connected between the two bolts; the overall structural design is simple and ingenious, a user does not need to conduct complex operation when needing to fold, only the pull rope needs to be pulled, and when needing to unfold, only the bolts on the two sides need to be inserted, and locking can be completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of wheelchairs, and more specifically, relates to a foldable wheelchair. Background Art

[0002] As an auxiliary medical device tool, wheelchairs have been increasingly applied to people's daily lives. For the elderly with limited mobility and patients with leg diseases, wheelchairs have become an essential tool.

[0003] However, the volume of the wheelchair itself is relatively large. Considering factors such as comfort, safety, and stability, its volume during use is usually larger than that of an ordinary chair with a backrest. This leads to the situation that when the wheelchair is not needed for storage, it often occupies a very large amount of space and cannot be stacked or placed at a high place, resulting in an entire area being occupied by the wheelchair.

[0004] Based on such problems, some foldable wheelchair structures have been developed and designed subsequently. When not in use, users can reduce the overall volume of the wheelchair by folding it, thus facilitating storage.

[0005] However, some of the currently designed and developed foldable wheelchair structures first have the problem that, in order to achieve the foldable effect, other redundant and complex structures are designed, which not only increases the price and cost of the wheelchair, but also makes the folding components more likely to be damaged and require frequent and repeated repairs. Moreover, some folding components are not very convenient for users to use and are quite cumbersome to operate. Summary of the Invention

[0006] Aiming at the above problems existing in the prior art, the purpose of the present invention is to provide a foldable wheelchair with convenient folding and unfolding operations, space-saving volume, and simple and lightweight structure. To solve the above problems, the technical solutions adopted by the present invention are as follows: A foldable wheelchair includes a backrest frame body that is independently arranged and only serves as a backrest, a seat plate frame body that only serves as a seat, and an armrest frame body that only serves as an armrest; It further includes a folding mechanism, and the folding mechanism includes a first folding arm and a second folding arm that are correspondingly arranged on both the left and right sides; The top end of the first folding arm is rotatably connected to the front end of the seat plate frame body, 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 body, and the bottom end of the second folding arm is rotatably connected to a front wheel; The first folding arm and the second folding arm on the same side are arranged in a crosswise manner and are rotatably connected to each other; The top of the second folding arm and the bottom of the backrest frame body are fixedly connected by an interference fit and a movable locking pin. There are two pins corresponding to the left and right, and a pull rope is connected between the two pins; The armrest frame body is rotatably connected to the backrest frame body; A support arm is connected between the armrest frame body and the seat plate frame body, and the support arm is rotatably connected to both the armrest frame body and the seat plate frame body.

[0007] Further, the second folding arm is located inside the backrest frame body.

[0008] Further, the top end of the second folding arm supports the seat plate frame body movably.

[0009] Further, an inner groove with an arc-shaped vertical cross-section is formed at the bottom of the rear end of the seat plate frame body. A support block is provided at the top end of the second folding arm, and a support portion matching the shape and size of the inner groove is formed on the support block.

[0010] Further, the first folding arm and the second folding arm tend to be horizontal near the bottom end.

[0011] Further, a battery box assembly is further included; The battery box assembly includes a battery and a box body that are detachably connected to each other, and the box body is fixedly connected to the first folding arm at the same time.

[0012] Further, a third folding arm is rotatably connected inside 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, and the auxiliary wheel is located behind the rear wheel; The top end of the third folding arm and the first folding arm are rotatably connected to a connecting arm at the same time. 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 plate frame body and the bottom end of the backrest frame body at the same time.

[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) The overall structure of the present invention is designed simply and ingeniously. When the user needs to fold it, no complex operation is required. Only the pull rope needs to be pulled. When it needs to be unfolded, only the pins on both sides need to be inserted to complete the locking; (2) The present invention adopts the design of an auxiliary wheel, which can play an auxiliary supporting role when climbing a slope, and after the wheelchair is folded, the auxiliary wheel can be transformed into a supporting wheel to facilitate the user to drag the folded wheelchair, improving the practical performance; (3) The present invention designs 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 plate frame body. During the folding process, the support part can also rotate flexibly without affecting the normal operation of the folding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the foldable wheelchair described in the present invention when unfolded; Figure 2 is a schematic semi-sectional view of the wheelchair when unfolded; Figure 3 is another schematic diagram of the overall structure of the wheelchair when unfolded; Figure 4 is Figure 3 a partial structural schematic diagram at position A in Figure 5 is another schematic diagram of the overall structure of the wheelchair when unfolded; Figure 6 is Figure 5 a partial structural schematic diagram at position B in Figure 7 is an internal structural schematic diagram of the bolt; Figures 8 - 11 is a schematic diagram of the change process of the wheelchair during the folding process; Figure 12 is a structural schematic diagram of the battery box assembly; Figure 13 is a structural schematic diagram of the box body; Figure 14 is a structural schematic diagram of the battery; In the figure: 1-backrest frame body; 2-seat plate frame body; 21-inner groove; 3-armrest frame body; 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-bolt; 8-pulling rope; 9-battery box assembly; 91-battery; 92-box body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present invention will be further described below in conjunction with specific embodiments.

[0016] Embodiment 1: As Figures 1 - 4As shown in the figure, the foldable wheelchair of the present invention includes a backrest frame body 1 that is independently arranged and only serves as a backrest, a seat plate frame body 2 that only serves as a seat, and an armrest frame body 3 that only serves as an armrest. In this embodiment, an important technical point is that the backrest frame body 1 only serves as a backrest, the seat plate frame body 2 only serves as a seat, and the armrest frame body 3 only serves as an armrest. Such a design fully takes into account the disadvantages existing in the prior art, that is, the folding operation is complex, the structural components are redundant, and more importantly, only on the premise of such a design, combined with the subsequent design in this embodiment, can the technical effects actually to be achieved by this solution be finally achieved.

[0017] In some other foldable wheelchair structures on the market, there are often structural intersections between the backrest, the seat, and the armrests. A part of one component is arranged inside another component, and the two overlap with each other. Such a design often overemphasizes the structural strength while ignoring the characteristics required for folding itself. During the folding process of the wheelchair, only through good coordination and cooperation among various structural components can the effect of a suitable volume and convenient and fast folding be finally achieved.

[0018] On this basis, in this embodiment, a folding mechanism 4 is further designed, 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 to the outside, they are the first folding arm 41, the second folding arm 42, and the backrest frame body 1. Among them, the tops of the two first folding arms 41 are rotatably connected to the front end of the seat plate frame body 2, and the bottoms are rotatably connected to the rear wheels 5. The tops of the two second folding arms 42 are rotatably connected to the bottom end of the backrest frame body 1, and at the same time, the bottoms are rotatably connected to the front wheels 6. In addition, the first folding arm 41 and the second folding arm 42 on the same side are arranged crosswise and rotatably connected to each other. Thus, the first folding arm 41 and the second folding arm 42 on the same side form a cross-shaped scissors folding mechanism 4, and then the seat plate frame body 2 can be folded downward, that is, towards the ground.

[0019] It should be noted that based on the consideration of the use environment and the overall volume after folding, in this embodiment, the parts of the first folding arm 41 and the second folding arm near the bottom are more horizontal, or rather, it forms a section close to the horizontal state, which can minimize the distance between the seat plate frame body 2 and the front wheels 6 and the rear wheels 5 after folding, achieving the purpose of saving volume.

[0020] In addition, in this embodiment, drive devices are respectively installed on the two rear wheels 5, and the front wheels 6 are rotatably connected to the second folding arm 42 through an adapter plate and bearings.

[0021] Finally, the armrest frame 3 is also rotatably connected to the backrest frame 1. A support arm 31 is connected between the armrest frame 3 and the seat board frame 2, and the support arm 31 is rotatably connected to both the armrest frame 3 and the seat board frame 2.

[0022] Up to this step, we can construct the basic structure of the foldable wheelchair. That is, with the seat board frame 2 as the dividing line, by pressing the backrest frame 1 forward and downward, the backrest frame 1 located above the seat board frame 2 can be tilted. Supported by the second folding arm 42, the front end of the backrest frame 1 drops and tends to be horizontal, and finally lands on the seat board frame 2. At the same time, the support arm 31 rotates in cooperation with the armrest frame 3, so that finally the support arm 31 also tends to be horizontal and lies flat on the outside of the seat board frame 2, while the armrest frame 3 follows the tilted backrest frame 1 and lands on the seat board frame 2, thus completing the folding of the components above the seat board frame 2.

[0023] Below the seat board frame 2, the top end of the first folding arm 41 folded in a scissor shape drops to reach the bottom end position of the second folding arm 42, and the top end of the second folding arm 42 also drops synchronously to reach the bottom end position of the first folding arm 41, thus completing the folding of the components below the seat board frame 2.

[0024] The above content describes the detailed folding process. It can be seen that the initiation of the folding process needs to be achieved by pushing the backrest frame 1. After pushing the backrest frame 1, it rotates with the second folding arm 42. Then, in the normal use state, a locking mechanism is necessarily required between the backrest frame 1 and the second folding arm 42 to prevent them from rotating naturally.

[0025] And for this locking mechanism, its unlocking and locking processes must be fast and convenient.

[0026] As Figure 7 shown, in this embodiment, this locking mechanism includes a bolt 7 that passes through the top end of the second folding arm 42 and the bottom end of the backrest frame 1 at the same time, and is correspondingly arranged on both sides. And a part of the tail of the bolt 7 is located outside the second folding arm 42, with a length convenient for the user to directly hold by hand.

[0027] In the second folding arm 42 and the backrest frame 1, there are corresponding slots. The bolt 7 is made of elastic material. During installation, the bolt 7 needs to pass through the second folding arm 42 first and then enter the backrest frame 1. In terms of limiting, there is a relatively protruding part in the middle of the bolt 7. This protruding part can be inserted into the second folding arm 42 and the backrest frame 1 during the installation process. The second folding arm 42 is provided with corresponding limiting parts that can block this protruding part to prevent it from disengaging from the slot of the second folding arm 42. In addition, the bolt 7 is movably lockable. That is, when the user pulls out the bolt 7 outward, it can disengage from the slot in the backrest frame 1 but cannot disengage from the slot of the second folding arm 42, thereby unlocking the lock between the second folding arm 42 and the backrest frame 1. At this time, the user can push the backrest frame 1 to rotate and fold it.

[0028] To facilitate the locking and unlocking of the user, in this embodiment, a pull rope 8 is connected between the tails of the two bolts 7. In the fully unfolded state of the wheelchair, the pull rope 8 is in a taut state, and the two bolts 7 are also stuck in the slots in an interference fit manner. When the user needs to fold the wheelchair, only need to pull the pull rope 8, so that the tails of the bolts 7 are subjected to an outward pulling force, and the bolts 7 will disengage from the slots in the backrest frame 1 and be stuck in the slots of the second folding arm 42, so that the pull rope 8 will not fall. After disengaging, the second folding arm 42 and the backrest frame 1 are in contact and locked. At this time, the user can push the backrest frame 1 to rotate and fold it. When the user needs to restore the wheelchair from the folded state to the use state, only need to rotate the backrest frame 1 into place, and then push the bolt 7 into the slot in the backrest frame 1 with the hand.

[0029] One of the major problems in the prior art is that the traditional bolt structure for foldable wheelchairs often needs to bear most of the force. After a long time of use or if it is not properly inserted during use, the risk of damage will be greatly increased, resulting in bolt damage and the wheelchair being unable to be folded for use.

[0030] Embodiment 2: As Figures 5 - 6 shown, the main part of the foldable wheelchair described in the present invention is the same as the structure in Embodiment 1. The difference is that an inner groove 21 with an arc-shaped vertical cross-section is opened at the bottom of the rear end of the seat plate frame 2. At the same time, a support block 43 is provided at the top of the second folding arm 42, and a support portion 44 matching the shape and size of the inner groove 21 is formed on the support block 43. The support portion 44 can always be stuck in the inner groove 21 during the folding process.

[0031] In the prior art, in order to achieve the effect of foldability, traditional wheelchairs often make each component as independent and detached from each other as possible. The problem caused is that the rear end of the seat part often lacks sufficient support, and the seat is prone to collapse during the user's sitting process. Based on such a problem, in combination with the structures of the independent backrest frame body 1 and seat plate frame body 2 in this application, a structure of an inner groove 21 and a support part 44 capable of realizing movable support is designed. When the wheelchair is unfolded and used, the support part 44 can support the inner groove 21, that is, the rear end of the seat plate frame body 2, improving the overall structural strength. During the folding process, as the seat plate frame body 2 moves forward with the backrest frame body 1, the support part 44 will smoothly disengage from the inner groove 21, and the two are separated to complete the folding operation of the whole vehicle, fully achieving the perfect combination of space utilization and actual performance.

[0032] Figures 8 - 11 Shows the process change state of the wheelchair structure described in this utility model from unfolding to folding.

[0033] Embodiment 3: In this embodiment, the main part can be the same as the structure in Embodiment 1 or Embodiment 2. The difference is that this foldable wheelchair further includes a battery box assembly 9. As Figures 12 - 14 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 fixedly connected to the first folding arm 41 at the same time.

[0034] In this embodiment, the design of the battery 91 is adopted for power supply, which facilitates the user to control actions such as the wheelchair moving forward, backward, turning, and stopping through the controller provided on the armrest frame body 3. The detachably connected battery 91 and box body 92 can facilitate the user to charge and replace the battery 91, improving the practical performance.

[0035] In addition, as can be seen from the figure, a locking component is also provided inside the battery and component 9 adopted in this embodiment. An opening 921 that protrudes is provided on the side of the box body 92, and a corresponding rotatable and resilient lock catch 911 is provided on the side of the battery 91, thereby realizing the detachable connection between the battery 91 and the box body 92.

[0036] Embodiment 4: In this embodiment, the main part 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 corresponding auxiliary wheels 46 and they are located behind the rear wheel 5.

[0037] Thus, through the design of the auxiliary wheel 46, when the user climbs a slope in a wheelchair, the auxiliary wheel 46 can play a role in auxiliary support and reduce the risk of tipping over. In addition, when the entire wheelchair is folded, the user can drag and move the wheelchair by holding the backrest frame 1. At this time, the auxiliary wheel 46 becomes the bottom support wheel, facilitating the user to drag the wheelchair.

[0038] In this embodiment, the top end of the third folding arm 45 and the first folding arm 41 are simultaneously rotatably connected 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 with a connecting piece 48. The connecting piece 48 is simultaneously rotatably connected to the rear end of the seat plate frame 2 and the bottom end of the backrest frame 1. Thus, through the design of the connecting piece 48, the folding action of this part of the third folding arm 45 is satisfied. The connecting piece 48 coordinates the transmission between the third folding arm 45, the seat plate frame 2, and the backrest frame 1, further ensuring the smooth and reasonable operation of the folding process on the premise of saving space.

Claims

1. A foldable wheelchair, characterized in that, It includes a backrest frame body that is independently arranged and only serves as a backrest, a seat board frame body that only serves as a seat, and an armrest frame body that only serves as an armrest; It further includes a folding mechanism, and the folding mechanism includes a first folding arm and a second folding arm that are correspondingly arranged on both the left and right sides; The top end of the first folding arm is rotatably connected to the front end of the seat board frame body, 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 body, and the bottom end of the second folding arm is rotatably connected to a front wheel; The first folding arm and the second folding arm on the same side are arranged crosswise and rotatably connected to each other; The top of the second folding arm and the bottom of the backrest frame body are fixedly connected through interference fit and a movable locking pin. There are two left and right corresponding pins, and a pull rope is connected between the two pins; The armrest frame body is rotatably connected to the backrest frame body; A support arm is connected between the armrest frame body and the seat board frame body, and the support arm is rotatably connected between the armrest frame body and the seat board frame body at the same time.

2. The foldable wheelchair according to claim 1, wherein The second folding arm is located inside the backrest frame body.

3. The foldable wheelchair according to claim 1, characterized in that, The top end of the second folding arm supports the seat board frame body movably.

4. The foldable wheelchair according to claim 3, characterized in that, An inner groove with an arc-shaped vertical cross-section is formed at the bottom of the rear end of the seat board frame body. A support block is provided at the top end of the second folding arm, and a support portion matching the shape and size of the inner groove is formed on the support block.

5. The foldable wheelchair according to claim 1, wherein, The parts of the first folding arm and the second folding arm near the bottom end tend to be horizontal.

6. The foldable wheelchair according to claim 1, wherein, It further includes a 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 fixedly connected to the first folding arm at the same time.

7. The foldable wheelchair according to any one of claims 1-6, characterized in that, A third folding arm is rotatably connected inside 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. The auxiliary wheel is located behind the rear wheel; The top end of the third folding arm and the first folding arm are rotatably connected to a connecting arm at the same time. The bottom end of the connecting arm is rotatably connected to the top end of the third folding arm, and the top end of the connecting arm is rotatably connected to a connecting piece. The connecting piece is rotatably connected to the rear end of the seat board frame body and the bottom end of the backrest frame body at the same time.

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