Foldable wheelchair

Abstract

The foldable wheelchair comprises a rear wheel framework, a seat framework, a front wheel framework, an armrest framework, an inclined connecting rod and a locking mechanism, the locking mechanism comprises two movable plates, a connecting beam and a tension spring, the movable plates are hinged to the seat framework and connected with the two ends of the connecting beam respectively, one end of the tension spring is fixed to the movable plates, and the other end of the tension spring is fixed to the front wheel framework. The other end of the tension spring is fixed to the seat framework, the side, close to the tension spring, of the movable plate abuts against the seat framework and the front wheel framework, and the top of the front wheel framework abuts against the bottom of the seat framework. Through the arrangement that the front wheel framework is hinged to the seat framework, the seat framework is hinged to the rear wheel framework, the armrest framework is hinged to the rear wheel framework and the seat framework, and the inclined connecting rods are hinged to the front wheel framework and the rear wheel framework, the whole wheelchair can be unfolded for use and folded for storage, and use is convenient and fast.

Description

Technical Field

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

[0002] The design of traditional wheelchair vehicles only considers the basic moving function and the stability of the structure. Most of them are fixed structures and cannot be folded for storage. Therefore, they occupy a large indoor space when not in use and are not convenient for storage. To solve this problem, foldable wheelchair vehicles have gradually emerged on the market. However, the existing foldable wheelchair vehicles often have problems such as complex folding structures and cumbersome operations. Moreover, the volume after folding is still relatively large, occupying more space, and the effect is not ideal. In addition, due to the lack of a reliable locking mechanism, these foldable wheelchair vehicles may lack sufficient stability and safety during the folding and unfolding processes. Not only are their load-bearing capacities and service lives poor, but they may also suddenly unlock during use, causing the wheelchair vehicle to fold and posing a safety hazard to users. Content of the Utility Model

[0003] The purpose of the utility model is to provide a foldable wheelchair vehicle to solve one or more of the technical problems existing in the above background art.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] A foldable wheelchair vehicle includes a rear-wheel frame, a seat frame, a front-wheel frame, an armrest frame, an inclined link and a locking mechanism. The front-wheel frame is hinged to the bottom of the seat frame. The rear side of the seat frame is hinged to the middle of the rear-wheel frame. The armrest frames are respectively hinged to the rear-wheel frame and the seat frame. One end of the inclined link is hinged to the front-wheel frame, and the other end of the inclined link is hinged to the rear-wheel frame. The vertical height of the hinge point of the inclined link and the front-wheel frame is higher than the vertical height of the hinge point of the inclined link and the rear-wheel frame. The locking mechanism includes two movable plates, a connecting beam and a tension spring. The movable plates are hinged to the seat frame. The movable plates are respectively connected to both ends of the connecting beam. One end of the tension spring is fixed to the movable plate, and the other end of the tension spring is fixed to the seat frame. The side of the movable plate close to the tension spring abuts against the seat frame and the front-wheel frame. The top of the front-wheel frame abuts against the bottom of the seat frame.

[0006] Preferably, the locking mechanism further includes a first locking pin and a second locking pin. The first locking pin is arranged inside the seat frame, and the second locking pin is arranged inside the front-wheel frame. The movable plate abuts against the first locking pin and the second locking pin.

[0007] Preferably, on one side of the movable plate close to the tension spring, a convex limiting part and a hook-shaped limiting part are arranged up and down, and the convex limiting part and the hook-shaped limiting part respectively abut against the first locking pin and the second locking pin.

[0008] Preferably, it further includes a first connecting piece. A first positioning groove matching the bottom of the seat frame is formed at the top of the first connecting piece. The top of the first connecting piece is connected to the seat frame. A hinge shaft is provided at the bottom of the first connecting piece. A second positioning groove matching the bottom of the seat frame is formed at the top of the front wheel frame. Both the first positioning groove and the second positioning groove are in contact with the bottom of the front wheel frame. A connecting part is provided on one side of the front wheel frame, and the connecting part is hinged to the first connecting piece through the hinge shaft.

[0009] Preferably, the locking mechanism further includes a first fixing bolt and a second fixing bolt. One end of the tension spring is fixed on the movable plate through the first fixing bolt, and the other end of the tension spring is fixed on the first connecting piece through the second fixing bolt. The second fixing bolt is coaxially arranged with the hinge shaft.

[0010] Preferably, it further includes two second connecting pieces and a reinforcing cross beam. The two second connecting pieces are arranged left and right in the middle of the rear wheel frame. Both ends of the reinforcing cross beam are respectively connected to the two second connecting pieces. One end of the second connecting piece is connected to the rear wheel frame, and the other end of the second connecting piece extends forward and is hinged to the seat frame.

[0011] Preferably, the armrest frame includes an armrest rod, a third connecting piece and a support rod. One end of the armrest rod is hinged to the rear wheel frame. One end of the support rod is hinged to the seat frame. The third connecting piece is hinged to the other end of the support rod and the bottom of the armrest rod. A third positioning groove matching the bottom of the armrest frame is formed at the top of the third connecting piece, and the third positioning groove is in contact with the bottom of the armrest frame.

[0012] Preferably, it further includes a footrest bracket. The front wheel frame is provided with a footrest support rod extending downward, and the footrest bracket is hinged to the footrest support rod.

[0013] Preferably, it further includes a front wheel assembly, a rear wheel assembly, a seat cushion, a backrest cushion and an armrest cushion. The front wheel assembly is arranged at the bottom of the front wheel frame. The rear wheel assembly is arranged at the bottom of the rear wheel frame. The backrest cushion covers the middle and upper parts of the rear wheel frame. The seat cushion covers the seat frame. The armrest cushion covers the armrest frame.

[0014] Preferably, the front wheel assembly is rotatably connected to the bottom of the front wheel frame.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: By arranging that the front wheel skeleton is hinged to the seat skeleton, the seat skeleton is hinged to the rear wheel skeleton, the armrest skeleton is hinged to the rear wheel skeleton and the seat skeleton, and the diagonal connecting rod hinged to the front wheel skeleton and the rear wheel skeleton, the overall wheelchair can be unfolded for use and folded for storage, which is convenient to use; when in use, under the elastic force of the tension spring, the movable plate is kept in contact with the seat skeleton and the front wheel skeleton, so as to lock the seat skeleton and the front wheel skeleton, avoiding the safety hazard caused by sudden unlocking during use and resulting in the folding of the wheelchair. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings further illustrate the present utility model, but the content in the drawings does not constitute any limitation to the present utility model.

[0017] Figure 1 is a schematic diagram of the overall structure of a wheelchair according to one embodiment of the present utility model;

[0018] Figure 2 is a schematic diagram of the overall structure of the wheelchair skeleton according to one embodiment of the present utility model;

[0019] Figure 3 is Figure 2 a partial enlarged schematic diagram;

[0020] Figure 4 is a schematic diagram of the structure of the locking mechanism according to one embodiment of the present utility model.

[0021] Wherein: rear wheel skeleton 1, seat skeleton 2, front wheel skeleton 3, armrest skeleton 4, diagonal connecting rod 5, locking mechanism 6, movable plate 61, connecting beam 62, tension spring 63, first locking pin 21, second locking pin 33, convex limiting part 611, hook-shaped limiting part 612, first connecting piece 7, first positioning groove 71, second positioning groove 31, connecting part 32, first fixing bolt 64, second fixing bolt 65, second connecting piece 8, strengthening cross beam 81, armrest rod 41, third connecting piece 42, support rod 43, third positioning groove 421, footrest bracket 12, footrest support rod 13, front wheel assembly 91, rear wheel assembly 92, seat cushion 93, backrest cushion 94, armrest cushion 95. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions of the present utility model will be further described below in conjunction with the drawings and through specific embodiments.

[0023] A foldable wheelchair of this embodiment, referring to the attached Figure 1 and 2, including a rear wheel frame 1, a seat frame 2, a front wheel frame 3, an armrest frame 4, an inclined link 5 and a locking mechanism 6. The front wheel frame 3 is hinged to the bottom of the seat frame 2. The rear side of the seat frame 2 is hinged to the middle of the rear wheel frame 1. The armrest frames 4 are respectively hinged to the rear wheel frame 1 and the seat frame 2. One end of the inclined link 5 is hinged to the front wheel frame 3, and the other end of the inclined link 5 is hinged to the rear wheel frame 1. The vertical height of the hinge point of the inclined link 5 and the front wheel frame 3 is higher than the vertical height of the hinge point of the inclined link 5 and the rear wheel frame 1. The locking mechanism 6 includes two movable plates 61, a connecting beam 62 and a tension spring 63. The movable plate 61 is hinged to the seat frame 2. The movable plate 61 is respectively connected to both ends of the connecting beam 62. One end of the tension spring 63 is fixed to the movable plate 61, and the other end of the tension spring 63 is fixed to the seat frame 2. The side of the movable plate 61 close to the tension spring 63 abuts against the seat frame 2 and the front wheel frame 3, and the top of the front wheel frame 3 abuts against the bottom of the seat frame 2.

[0024] By arranging that the front wheel frame 3 is hinged to the seat frame 2, the seat frame 2 is hinged to the rear wheel frame 1, the armrest frames 4 are hinged to the rear wheel frame 1 and the seat frame 2, and the inclined link 5 hinged to the front wheel frame 3 and the rear wheel frame 1, the front wheel frame 3, the seat frame 2 and the armrest frames 4 can be folded as a whole towards the rear wheel frame 1, and a stable wheelchair structure is formed during unfolding. The folding or unfolding of the wheelchair can be completed without cumbersome steps, improving the convenience of use. The movable plate 61, the tension spring 63 and the inclined link 5 not only provide a reliable locking function, but also effectively prevent the wheelchair from folding accidentally during use, greatly reducing the safety hazard to the user.

[0025] Preferably, referring to the attached Figure 3 and 4 , the locking mechanism 6 further includes a first locking pin 21 and a second locking pin 33. The first locking pin 21 is arranged inside the seat frame 2, and the second locking pin 33 is arranged inside the front wheel frame 3. The movable plate 61 abuts against the first locking pin 21 and the second locking pin 33.

[0026] By respectively arranging the first locking pin 21 on the seat frame 2 and the second locking pin 33 on the front wheel frame 3, locking points for the movable plate 61 with respect to the seat frame 2 and the front wheel frame 3 are provided. When the wheelchair is unfolded and in use, the movable plate 61 remains in contact with the first locking pin 21 and the second locking pin 33, so that the locking mechanism 6 can maintain the locking of the seat frame 2 and the front wheel frame 3, effectively preventing the wheelchair from accidentally moving or folding in the folded or unfolded state.

[0027] Furthermore, a convex limiting portion 611 and a hook-shaped limiting portion 612 are arranged up and down on the side of the movable plate 61 close to the tension spring 63. The convex limiting portion 611 and the hook-shaped limiting portion 612 respectively abut against the first locking pin 21 and the second locking pin 33.

[0028] By providing a raised limiting portion 611 and a hooked limiting portion 612 on the movable plate 61, it is ensured that the movable plate 61 can correspond to the first locking pin 21 and the second locking pin 33 at the same time; through the abutment of the raised limiting portion 611 with the first locking pin 21 and the abutment of the hooked limiting portion 612 with the second locking pin 33, when the wheelchair is unfolded and in use, the movable plate 61 is kept in abutment with the seat frame 2 and the front wheel frame 3, ensuring that the wheelchair will not accidentally fold or slide during use.

[0029] Preferably, it further includes a first connecting member 7. The top of the first connecting member 7 is provided with a first positioning groove 71 that matches the bottom of the seat frame 2. The top of the first connecting member 7 is connected to the seat frame 2. The bottom of the first connecting member 7 is provided with a hinge shaft. The top of the front wheel frame 3 is provided with a second positioning groove 31 that matches the bottom of the seat frame 2. Both the first positioning groove 71 and the second positioning groove 31 are in contact with the bottom of the front wheel frame 3. One side of the front wheel frame 3 is provided with a connecting portion 32, and the connecting portion 32 is hinged to the first connecting member 7 through the hinge shaft.

[0030] By providing the first connecting member 7, the hinge connection between the seat frame 2 and the front wheel frame 3 is realized by using the first connecting member 7. When the wheelchair is unfolded and in use, the second positioning groove 31 at the top of the front wheel frame 3 is in contact with the bottom of the seat frame 2, increasing the contact area and stability between the seat frame 2 and the front wheel frame 3, making the wheelchair more stable during use. By providing the first positioning groove 71 on the first connecting member 7, the contact area between the first connecting member 7 and the seat frame 2 is increased. When connecting the first connecting member 7 and the seat frame 2, rivets or bolts can be used to pass through the first positioning groove 71 and the seat frame 2 to achieve the connection, improving the connection stability.

[0031] Preferably, the locking mechanism 6 further includes a first fixing bolt 64 and a second fixing bolt 65. One end of the tension spring 63 is fixed on the movable plate 61 through the first fixing bolt 64, and the other end of the tension spring 63 is fixed on the first connecting member 7 through the second fixing bolt 65. The second fixing bolt 65 is coaxially arranged with the hinge shaft. By providing the first fixing bolt 64 and the second fixing bolt 65, the fixing of both ends of the tension spring 63 is realized.

[0032] Preferably, it further includes two second connecting members 8 and a reinforcing cross beam 81. The two second connecting members 8 are arranged left and right in the middle of the rear wheel frame 1. Both ends of the reinforcing cross beam 81 are connected to the two second connecting members 8 respectively. One end of the second connecting member 8 is connected to the rear wheel frame 1, and the other end of the second connecting member 8 extends forward and is hinged to the seat frame 2.

[0033] By arranging second connecting members 8 on the left and right of the rear wheel frame 1 and arranging a reinforcing cross beam 81 between the two second connecting members 8, the overall structural strength of the rear wheel frame 1 is improved, making the wheelchair more stable and durable during use. Since the second connecting member 8 extends forward, the arrangement of the second connecting member 8 also enables the seat frame 2 to fit more closely to the rear wheel frame 1 when folding, reducing the volume after folding and further optimizing the space utilization rate.

[0034] Preferably, the armrest frame 4 includes an armrest rod 41, a third connecting member 42 and a support rod 43. One end of the armrest rod 41 is hinged to the rear wheel frame 1, one end of the support rod 43 is hinged to the seat frame 2, the third connecting member 42 is hinged to the other end of the support rod 43 and the bottom of the armrest rod 41, and a third positioning groove 421 matching the bottom of the armrest frame 4 is formed at the top of the third connecting member 42, and the third positioning groove 421 fits with the bottom of the armrest frame 4.

[0035] By arranging one end of the armrest rod 41 to be hinged to the rear wheel frame 1, one end of the support rod 43 to be hinged to the seat frame 2, and arranging the third connecting member 42 to be hinged to the armrest rod 41 and the support rod 43 respectively, when the wheelchair is in the folded state, the whole armrest frame 4 can be folded backward in the direction of the rear wheel frame 1; and when in the unfolded use state, under the action of the seat frame 2, the armrest rod 41, the third connecting member 42 and the support rod 43 form a stable structure, improving the stability of the armrest frame 4. By forming a third positioning groove 421 matching the bottom of the armrest rod 41 at the top of the third connecting member 42, when in the unfolded use state, the third positioning groove 421 fits with the bottom of the armrest rod 41, increasing the contact area between the armrest rod 41 and the third connecting member 42 and further improving the structural stability.

[0036] Preferably, it further includes a footrest bracket 12. The front wheel frame 3 is provided with a footrest support rod 13 extending downward, and the footrest bracket 12 is hinged to the footrest support rod 13. By arranging the footrest bracket 12, comfortable foot support can be provided for the user; by arranging the footrest bracket 12 to be hinged to the footrest support rod 13, the footrest bracket 12 can be folded with the front wheel frame 3, further reducing the occupied space.

[0037] Preferably, it further includes a front wheel assembly 91, a rear wheel assembly 92, a seat cushion 93, a backrest 94 and an armrest cushion 95. The front wheel assembly 91 is arranged at the bottom of the front wheel frame 3, the rear wheel assembly 92 is arranged at the bottom of the rear wheel frame 1, the backrest 94 covers the upper middle part of the rear wheel frame 1 and covers the seat frame 2, and the armrest cushion 95 covers the armrest frame 4.

[0038] Preferably, the front wheel assembly 91 is rotatably connected to the bottom of the front wheel frame 3. By providing the rotational connection between the front wheel assembly 91 and the front wheel frame 3, the angle of the front wheel assembly 91 can be adjusted during folding, enabling the front wheels to fit more closely to the seat frame 2, further reducing the overall space occupied after folding.

[0039] The working principle of this embodiment is as follows: The wheelchair of this embodiment has two states: unfolded for use and folded. Specifically, when unfolded for use, each frame is opened to form the wheelchair usage structure. After being opened in place, under the elastic force of the tension spring 63, the movable plate 61 is kept in contact with the seat frame 2 and the front wheel frame 3, achieving the locking of the seat frame 2 and the front wheel frame 3. At the same time, the diagonal link 5 and the seat frame 2 and the rear wheel frame 1 form a stable structure, avoiding the safety hazard caused by sudden unlocking during use, which may lead to the folding of the wheelchair.

[0040] When folding, by pulling the connecting beam 62 to stretch the tension spring 63, the convex limiting portion 611 is separated from the first locking pin 21, and at the same time, the hook-shaped limiting portion 612 is separated from the second locking pin 33, so that the locking mechanism 6 as a whole moves away from the seat frame 2 and the front wheel frame 3, realizing the unlocking of the seat frame 2 and the front wheel frame 3. Then, the front wheel frame 3 can be folded towards the seat frame 2, the seat frame 2 can be folded towards the rear wheel frame 1, and the armrest frame 4 can be folded towards the rear wheel frame 1, thus realizing the overall folding of the wheelchair, which is convenient to operate.

[0041] The technical principle of the present invention has been described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be construed in any way as a limitation on the protection scope of the present invention. Based on the explanations herein, those skilled in the art can readily conceive of other specific embodiments of the present invention without creative efforts, and these embodiments will all fall within the protection scope of the present invention.

Claims

1. A foldable wheelchair, characterized in that, It includes a rear-wheel frame, a seat frame, a front-wheel frame, an armrest frame, an inclined link and a locking mechanism. The front-wheel frame is hinged to the bottom of the seat frame. The rear side of the seat frame is hinged to the middle of the rear-wheel frame. The armrest frames are respectively hinged to the rear-wheel frame and the seat frame. One end of the inclined link is hinged to the front-wheel frame, and the other end of the inclined link is hinged to the rear-wheel frame. The vertical height of the hinge point of the inclined link and the front-wheel frame is higher than the vertical height of the hinge point of the inclined link and the rear-wheel frame. The locking mechanism includes two movable plates, a connecting beam and a tension spring. The movable plates are hinged to the seat frame. The movable plates are respectively connected to both ends of the connecting beam. One end of the tension spring is fixed to the movable plate, and the other end of the tension spring is fixed to the seat frame. The side of the movable plate close to the tension spring abuts against the seat frame and the front-wheel frame. The top of the front-wheel frame abuts against the bottom of the seat frame.

2. The foldable wheelchair according to claim 1, characterized in that, The locking mechanism further includes a first locking pin and a second locking pin. The first locking pin is arranged inside the seat frame, and the second locking pin is arranged inside the front-wheel frame. The movable plate abuts against the first locking pin and the second locking pin.

3. The foldable wheelchair according to claim 2, wherein, On the side of the movable plate close to the tension spring, a convex limiting part and a hook-shaped limiting part are arranged up and down. The convex limiting part and the hook-shaped limiting part respectively abut against the first locking pin and the second locking pin.

4. A foldable wheelchair according to claim 1, characterized in that, It further includes a first connecting piece. A first positioning groove matching the bottom of the seat frame is formed at the top of the first connecting piece. The top of the first connecting piece is connected to the seat frame. A hinge shaft is arranged at the bottom of the first connecting piece. A second positioning groove matching the bottom of the seat frame is formed at the top of the front-wheel frame. Both the first positioning groove and the second positioning groove are in contact with the bottom of the front-wheel frame. A connecting part is arranged on one side of the front-wheel frame. The connecting part and the first connecting piece are hinged through the hinge shaft.

5. The foldable wheelchair according to claim 4, characterized in that, The locking mechanism further includes a first fixing bolt and a second fixing bolt. One end of the tension spring is fixed to the movable plate through the first fixing bolt, and the other end of the tension spring is fixed to the first connecting piece through the second fixing bolt. The second fixing bolt is coaxially arranged with the hinge shaft.

6. The foldable wheelchair according to claim 1, wherein It further includes two second connecting pieces and a strengthening cross beam. The two second connecting pieces are arranged left and right in the middle of the rear-wheel frame. Both ends of the strengthening cross beam are respectively connected to the two second connecting pieces. One end of the second connecting piece is connected to the rear-wheel frame, and the other end of the second connecting piece extends forward and is hinged to the seat frame.

7. The foldable wheelchair according to claim 1, characterized in that, The armrest frame includes an armrest rod, a third connecting piece and a support rod. One end of the armrest rod is hinged to the rear-wheel frame. One end of the support rod is hinged to the seat frame. The third connecting piece is hinged to the other end of the support rod and the bottom of the armrest rod. A third positioning groove matching the bottom of the armrest frame is formed at the top of the third connecting piece. The third positioning groove is in contact with the bottom of the armrest frame.

8. A foldable wheelchair according to claim 1, wherein, It further includes a footrest bracket. The front wheel frame is provided with a footrest support rod extending downward, and the footrest bracket is hinged to the footrest support rod.

9. A foldable wheelchair according to claim 1, wherein, It further includes a front wheel assembly, a rear wheel assembly, a seat cushion, a backrest cushion and an armrest cushion. The front wheel assembly is arranged at the bottom of the front wheel frame, the rear wheel assembly is arranged at the bottom of the rear wheel frame, the backrest cushion covers the upper middle part of the rear wheel frame, the seat cushion covers the seat frame, and the armrest cushion covers the armrest frame.

10. The foldable wheelchair according to claim 9, wherein, The front wheel assembly is rotatably connected to the bottom of the front wheel frame.

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