A linkage folding wheelchair

Abstract

The application relates to the technical field of folding wheelchairs, in particular to a linkage type folding wheelchair which comprises a main frame, a sub-frame, a sitting frame, a supporting rod and a locking structure, the two ends of the supporting rod are respectively hinged to the main frame and the sitting frame; the rear part of the sitting frame is provided with a first connecting piece, the top of the sub-frame is provided with a second connecting piece, the second connecting piece is rotationally connected to the bottom of the first connecting piece through an a rotating shaft, so that the sitting frame and the sub-frame form linkage cooperation, and the sitting frame forms linkage cooperation with the main frame through the supporting rod; the main frame and the sub-frame are rotationally connected through a b rotating shaft and are matched with the locking structure, so that the main frame and the sub-frame are locked and fixed, through the linkage cooperation structure between the sitting frame and the sub-frame and between the sitting frame and the main frame, synchronous linkage folding of the main frame, the sub-frame and the sitting frame is realized, the folding structure and the operation steps are simplified, and the linkage type folding is more convenient for the old and the disabled to use.

Description

Technical Field

[0001] This invention relates to the field of folding wheelchair technology, and more specifically to a linkage folding wheelchair. Background Technology

[0002] Wheelchairs are an important means of transportation for people with mobility impairments. Folding wheelchairs are specifically designed for easy carrying and storage. Traditional wheelchairs fold with the left and right side frames folding together, but they are still relatively large and have limited storage capacity. With the development of folding wheelchairs, a front-to-back folding structure has emerged. This front-to-back folding structure is different from the left-to-right folding structure, providing users with another folding method and making it smaller when folded. However, although the existing front-to-back folding structure can achieve basic folding functions, it still has certain limitations in actual use. Its folding structure is relatively complex, with many folding actions and cumbersome operation, especially for some people with mobility impairments or the elderly, who need to expend a lot of effort to fold these wheelchairs. Summary of the Invention

[0003] The purpose of this invention is to provide a linkage folding wheelchair, which aims to solve the problems mentioned above, such as the cumbersome folding operation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a linkage folding wheelchair, comprising a main frame, a sub-frame, a seat frame, a support rod, and a locking structure, wherein the two ends of the support rod are respectively hinged to the main frame and the seat frame; a first connecting member is provided at the rear of the seat frame, and a second connecting member is provided at the top of the sub-frame, the second connecting member being rotatably connected to the first connecting member via a pivot a, thereby enabling the seat frame and the sub-frame to form a linkage engagement, and the seat frame simultaneously forming a linkage engagement with the main frame via the support rod; the main frame and the sub-frame are rotatably connected via a pivot b and engage with the locking structure to lock and fix the main frame and the sub-frame.

[0005] Optionally, the rotation axis core, a-axis, and b-axis of the support rod are parallel to each other; the top of the sub-frame is provided with a connecting hole for connecting the second connector, the axis cores of the a-axis and b-axis, and the connecting hole form an angle structure, and the connecting hole is the vertex of the angle structure. When the sub-frame rotates relative to the main frame, the seat rotates in conjunction with the rotation of the second connector and the rotation of the first connector, and the seat rotates relative to the support rod, so that the seat, support rod, main frame, and sub-frame are synchronized.

[0006] Optionally, in the wheelchair-extended state, the subframe gradually tilts downwards from front to back, and the main frame gradually tilts upwards from front to back, and is rotatably connected to the middle of the subframe via the b-axis.

[0007] Optionally, the a-axis is located below the seat frame and is hinged to a connecting rod. The end of the connecting rod away from the a-axis is hinged to the front of the seat frame. The first connecting member protrudes downward from the seat frame and forms a triangular structure with the connecting rod and the seat frame.

[0008] Optionally, the connecting rod gradually slopes downward from front to back, and cooperates with the support rod and the main frame to form a support structure.

[0009] Optionally, the locking structure includes a trigger lock and a lock hole. The lock hole is located on the sub-frame, and the lock hole, the b-axis, and the connecting hole are on the same straight line. The trigger lock is mounted on the main frame via a base, and it is telescopically provided with a pin corresponding to the lock hole.

[0010] Optionally, the main frame is provided with a limiting block, and the limiting block abuts against the sub-frame.

[0011] Optionally, an elastic auxiliary component is provided on the folding path of the main frame and the sub-frame. The elastic auxiliary component is located below the b-axis, with one end connected to the main frame and the other end connected to the sub-frame.

[0012] Optionally, the main frame includes a horizontal bar and a legs symmetrically arranged at both ends of the horizontal bar, and the sub-frame includes a horizontal bar and b legs symmetrically arranged at both ends of the horizontal bar; both the a legs and the b legs are provided with pulleys at their bottoms.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a linkage folding wheelchair in which the main frame and the sub-frame are rotatably connected and, together with a locking structure, form a stable support structure that supports the main frame and the sub-frame to maintain their unfolded state, making them more stable to use. After the locking structure is released, the main frame, the sub-frame and the seat frame can be folded synchronously through the linkage mechanism between the seat frame and the sub-frame, and between the seat frame and the main frame. This simplifies the folding structure and operation steps, and the linkage folding makes it easier for the elderly and people with mobility impairments to use. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a linkage folding wheelchair according to the present invention; Figure 2 This is a schematic diagram of the unfolded state of a linkage folding wheelchair according to the present invention; Figure 3This is a schematic diagram of the folding state of a linkage folding wheelchair according to the present invention; Figure 4 This is a perspective view of the main frame in this invention; Figure 5 This is a perspective view of the subframe in this invention; Figure 6 This is a perspective view of the seat frame from the front angle in this invention; Figure 7 This is a perspective view of the seat frame in this invention from a background angle; Figure 8 This is a schematic diagram of the overall installation of a linkage folding wheelchair according to the present invention.

[0016] In the diagram: 1. Main frame; 2. Sub-frame; 3. Seat frame; 4. Support rod; 11. First connecting piece; 12. Second connecting piece; 21. A-shaft; 22. B-shaft; 30. Connecting rod; 102. Limiting block; 200. Connecting hole; 201. Elastic auxiliary component; 400. Locking hole; 401. Trigger lock; 500. Pulley; 501. Seat plate; 502. Backrest. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0020] As shown in the figure, a linkage folding wheelchair includes a main frame 1, a sub-frame 2, a seat frame 3, a support rod 4, and a locking structure. The support rod 4 is hinged at both ends to the main frame 1 and the seat frame 3, respectively. The main frame 1 uses the support rod 4 to support the front of the seat frame 3, and the sub-frame 2 uses a first connector 11 and a second connector 12 to support the rear of the seat frame 3, forming a stable support structure for supporting the seat frame 3. Figure 8 As shown, the seat frame 3 is provided with a seat plate 501 and a backrest 502. The seat plate 501 is fixedly installed on the seat frame 3, and the backrest 502 is rotatably connected to the seat plate 501, enabling folding. A first connecting member 11 is provided at the rear of the seat frame 3, and the first connecting member 11 is fixedly installed on the seat frame 3. It can be fixedly installed by screws or bolts. A second connecting member 12 is provided at the top of the sub-frame 2. The second connecting member 12 is rotatably installed on the sub-frame 2, and the sub-frame 2 and the second connecting member 12 can be directly fixedly connected, that is, the sub-frame 2 and the second connecting member 12 rotate synchronously. The seat frame 3 and the first connecting member 11 are foldable. Connector 11 rotates synchronously, and at the same time, second connector 12 is rotatably connected to first connector 11 via a rotating shaft 21, thereby enabling seat 3 and sub-frame 2 to form a linkage. Seat 3 is also linked to main frame 1 via support rod 4. Main frame 1 and sub-frame 2 are rotatably connected via a rotating shaft 22 and cooperate with locking structure to lock and fix main frame 1 and sub-frame 2. Main frame 1 and sub-frame 2 are connected via rotating shaft 22, and locking structure is installed on main frame 1 and sub-frame 2, forming two-point fixation with rotating shaft 22, thereby fixing the unfolded state of main frame 1 and sub-frame 2.

[0021] The rotating shafts of the support rod 4, a-axis 21, and b-axis 22 are parallel to each other, ensuring that the rotation trajectories of the seat frame 3, sub-frame 2, and support rod 4 are consistent, making the folding process smoother and further improving the smoothness of wheelchair folding and unfolding, while reducing operating resistance. The top of the sub-frame 2 is provided with a connecting hole 200 for connecting the second connecting piece 12. Bolts can be inserted through the connecting hole 200 and the second connecting piece 12, and then nuts can be threaded onto the bolts to clamp the sub-frame 2 and the second connecting piece 12. This allows the second connecting piece 12 and the sub-frame 2 to swing slightly, improving the precision of the connection. The a-axis 21 and b-axis 22, along with the connecting hole 200, form an angled structure with the connecting hole 200 at its apex. This allows the subframe 2 to rotate, while the second connector 12 generates an oblique force that causes the seat frame 3 to rotate. Specifically, when the subframe 2 rotates and folds relative to the main frame 1, the second connector 12 follows suit and, in conjunction with the first connector 11, causes the seat frame 3 to rotate downwards. The seat frame 3 rotates relative to the support rod 4, thus synchronizing the seat frame 3, support rod 4, main frame 1, and subframe 2. In the unfolded state, the subframe 2 gradually tilts downwards from front to back, while the main frame 1 gradually tilts upwards from front to back. The main frame 1 is rotatably connected to the middle of the subframe 2 via the b-axis 22. The main frame 1 and subframe 2 form an angle, creating a triangular structure with the ground. Simultaneously, the locking structure restricts deformation of this angle, improving the stability of the folding wheelchair. Furthermore, the main frame 1 is connected to the middle of the sub-frame 2. The sub-frame 2 is connected to the second connector 12 at its head. The inclined sub-frame 2, in conjunction with the structure, can generate a downward pulling force when the sub-frame 2 is unfolded. It also tightens the first connector 11 through the second connector 12 at its head, providing a pulling force to the rear of the seat frame 3. At the same time, the seat frame 3 is connected to the main frame 1 through the support rod 4. This structure provides a reliable pulling force to the front of the seat frame 3, thereby ensuring that the seat frame 3 is reliably pulled and positioned when unfolded, thus ensuring the stability of the seat frame 3.

[0022] In the linkage folding wheelchair provided by this invention, the main frame 1 and the sub-frame 2 are rotatably connected and, together with a locking structure, form a stable support structure that supports the main frame 1 and the sub-frame 2 to maintain their unfolded state, making them more stable to use. After the locking structure is released, the main frame 1, the sub-frame 2, and the seat frame 3 can be synchronously folded through the linkage mechanism between the seat frame 3 and the sub-frame 2, and between the seat frame 3 and the main frame 1. This simplifies the folding structure and operation steps, and the linkage folding makes it easier for the elderly and people with mobility impairments to use.

[0023] In some embodiments, the a-axis 21 is disposed below the seat frame 3 and is hinged to a connecting rod 30. The end of the connecting rod 30 away from the a-axis 21 is hinged to the front of the seat frame 3. One end of the connecting rod 30 is connected to the a-axis 21, and the other end is connected to the front of the seat frame 3. The connecting rod 30 increases the support point of the seat frame 3. The first connecting member 11 protrudes downward from the seat frame 3 and is connected to the a-axis 21 located at the bottom of the first connecting member 11 and the connecting rod 30. One end of the connecting rod 30 is connected to the front of the seat frame 3. That is, the first connecting member 11, the connecting rod 30 and the seat frame 3 form a triangular structure, which can further improve the stability of the seat frame 3. Based on this, the connecting rod 30 gradually tilts downwards from front to back, allowing it to cooperate with the support rod 4 and the main frame 1 to form a support structure, improving the stability of the wheelchair. This support structure is triangularly distributed, with the support rod 4 and the main frame 1 serving as two sides, and the connecting rod 30 and its extension serving as the third side. It should be noted that to ensure proper folding, the connecting rod 30 is not connected to the main frame 1. Furthermore, during folding, the seat frame 3 rotates downwards, and the angle between the support rod 4 and the front of the seat frame 3 gradually decreases. Therefore, it is preferable to set the angle between the support rod 4 and the seat frame 3 at the front to be less than 90°, making folding smoother.

[0024] In some embodiments, the locking structure includes a trigger lock 401 and a lock hole 400. The lock hole 400 is disposed on the sub-frame 2, and the lock hole 400, the b-rotating shaft 22, and the connecting hole 200 are on the same straight line. The trigger lock 401 is mounted on the main frame 1 via a base, and it is telescopically provided with a pin corresponding to the lock hole 400. The trigger lock 401 can be an existing push-button pin, pull-out pin, etc. Specifically, the trigger lock 401 includes a base, a trigger, and a pin. The trigger is connected to the pin. When the user presses the trigger, the pin retracts into the base, thereby disengaging from the lock hole 400. A return spring is also provided in the base. After the trigger is released, the pin extends again under the restoring force of the return spring. Figure 5 As shown, the locking hole 400 is located between the connecting hole 200 and the b-rotating shaft 22. The trigger locking element 401 is mounted on the main frame 1 via a base, and the trigger locking element 401 corresponds to the locking hole 400. Simultaneously, the locking hole 400 can also be located on the sub-frame 2, away from the connecting hole 200. This locking structure can also be reversed, with the locking hole 400 located on the main frame 1 and the trigger locking element 401 mounted on the sub-frame 2. This also allows for two-point fixation in conjunction with the b-rotating shaft 22, preventing rotation of the main frame 1 and the sub-frame 2.

[0025] Since the main frame 1 is connected to the middle of the sub-frame 2, and the top of the sub-frame 2 is provided with a connecting hole 200 for connecting the second connecting piece 12, part of the sub-frame 2 protrudes from the main frame 1. In order to ensure the support stability of the main frame 1 and the sub-frame 2 and to protect the locking structure, a limiting block 102 is provided on the main frame 1, and the limiting block 102 abuts against the sub-frame 2. When the wheelchair is in the unfolded state, that is, the locking structure and the b-axis 22 fix the main frame 1 and the sub-frame 2 at two points to prevent them from rotating and folding. At this time, the limiting block 102 abuts against the top of the sub-frame 2, which plays the role of supporting the sub-frame 2 and preventing the locking structure from bearing the pressure of the sub-frame 2.

[0026] In some embodiments, an elastic auxiliary member 201 is provided on the folding path of the main frame 1 and the sub-frame 2. The elastic auxiliary member 201 is located below the b-axis 22, with one end connected to the main frame 1 and the other end connected to the sub-frame 2. The elastic auxiliary member 201 can be implemented using an existing tension spring. The main purpose of providing the elastic auxiliary member 201 is to facilitate smoother folding and reduce the force required by the user. In the normal unfolded state, the elastic auxiliary member 201 is in a stretched state. When folding begins, the sub-frame 2 and the main frame 1 can quickly rotate and move closer together under the action of the elastic force of the elastic auxiliary member 201.

[0027] In some embodiments, the main frame 1 and the sub-frame 2 are symmetrically distributed structures. The main frame 1 includes a crossbar and a legs symmetrically arranged at both ends of the crossbar. The sub-frame 2 includes a crossbar and b legs symmetrically arranged at both ends of the crossbar. Each leg is provided with a pulley 500 at its bottom. At least one crossbar a can be provided on the main frame 1, and at least one crossbar b can be provided on the sub-frame 2. A limiting block 102 is provided on the crossbar a and abuts against the b legs. The elastic auxiliary member 201 is connected to the crossbar a and the crossbar b at both ends, respectively. There are two first connecting members 11 and two second connecting members 12. The two second connecting members 12 are respectively provided on the top of the corresponding b legs.

[0028] In the unfolded state, the main frame 1, the secondary frame 2, and the ground form a triangular structure. Simultaneously, the main frame 1, support rod 4, and connecting rod 30 form a supporting structure. The seat frame 3, connecting rod 30, and the first connecting piece 11 also form a triangular structure, ensuring balanced force distribution at all support points of the wheelchair, especially for supporting the front of the seat frame 3. During folding, the angle between the connecting rod 30 and the seat frame 3 does not rotate, primarily improving the stability of the seat frame 3. When the wheelchair needs to be folded, the user simply operates the trigger lock 401 to disengage it from the lock hole 400, and then lifts the seat frame 3 backward and upward. Yes, the subframe 2 rotates closer to the main frame 1, and the seat frame 3 and support rod 4 will rotate, that is, the included angle between the front of the seat frame 3 and the support rod 4 gradually decreases. At the same time, the rebound force of the elastic auxiliary component 201 will pull the subframe 2 closer to the rear of the main frame 1, so that the main frame 1 and the subframe 2 move closer to each other. The pulley 500 of the subframe 2 will roll to assist in folding, without the user having to completely lift the wheelchair to fold it. While the subframe 2 rotates, the second connecting component 12 rotates forward and upward to approach the first connecting component 11. The seat frame 3 gradually approaches the subframe 2, and the support rod 4 gradually approaches the other side of the main frame 1.

[0029] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A linkage folding wheelchair, characterized in that, The device includes a main frame, a sub-frame, a seat frame, a support rod, and a locking structure. The support rod is hinged at both ends to the main frame and the seat frame, respectively. A first connecting member is provided at the rear of the seat frame, and a second connecting member is provided at the top of the sub-frame. The second connecting member is rotatably connected to the bottom of the first connecting member via a pivot a, thereby enabling the seat frame and the sub-frame to work together. The seat frame is also rotatably connected to the main frame via the support rod. The main frame and the sub-frame are rotatably connected via a pivot b and are engaged with the locking structure to lock and fix the main frame and the sub-frame.

2. The linkage folding wheelchair according to claim 1, characterized in that, The rotating shaft core, a rotating shaft, and b rotating shaft of the support rod are parallel to each other; the top of the sub-frame is provided with a connecting hole for connecting the second connecting member. The shaft cores of the a rotating shaft and b rotating shaft and the connecting hole form an angle structure, and the connecting hole is the vertex of the angle structure. When the sub-frame rotates relative to the main frame, the seat frame rotates in conjunction with the rotation of the second connecting member and the rotation of the first connecting member. The seat frame rotates relative to the support rod, so that the seat frame, support rod, main frame, and sub-frame are synchronized.

3. The linkage folding wheelchair according to claim 2, characterized in that, When the wheelchair is in the unfolded state, the subframe gradually tilts downwards from front to back, and the main frame gradually tilts upwards from front to back, and is rotatably connected to the middle of the subframe via the b-axis.

4. The linkage folding wheelchair according to claim 3, characterized in that, The pivot a is located below the seat frame and is hinged to a connecting rod. The end of the connecting rod away from the pivot a is hinged to the front of the seat frame. The first connecting member protrudes downward from the seat frame and forms a triangular structure with the connecting rod and the seat frame.

5. A linkage folding wheelchair according to claim 4, characterized in that, The connecting rod gradually slopes downwards from front to back, and works in conjunction with the support rod and the main frame to form a support structure.

6. A linkage folding wheelchair according to claim 3, characterized in that, The locking structure includes a trigger lock and a lock hole. The lock hole is located on the sub-frame, and the lock hole, the b-axis, and the connecting hole are on the same straight line. The trigger lock is mounted on the main frame via a base, and it is telescopically equipped with a pin corresponding to the lock hole.

7. A linkage folding wheelchair according to claim 6, characterized in that, The main frame is provided with a limit block, which abuts against the sub-frame.

8. A linkage folding wheelchair according to claim 3, characterized in that, Elastic auxiliary components are provided along the folding paths of the main frame and the sub-frame. The elastic auxiliary components are located below the b-axis, with one end connected to the main frame and the other end connected to the sub-frame.

9. A linkage folding wheelchair according to claim 1, characterized in that, The main frame includes a horizontal bar and a legs symmetrically arranged at both ends of the horizontal bar; the sub-frame includes a horizontal bar and b legs symmetrically arranged at both ends of the horizontal bar; pulleys are provided at the bottom of both legs a and b.

Images