Wheelchair frame and electric wheelchair
By introducing a bent structure and articulated connection into the wheelchair frame, combined with the pin locking assembly and unlocking mechanism, the convenient folding and space optimization of the wheelchair is achieved, solving the structural defects and space occupation problems of the existing wheelchair or electric wheelchair folding design.
Patent Information
- Application Number
- CN202420695422.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-07
AI Technical Summary
The folding design of existing wheelchairs or electric wheelchairs has structural defects, which makes it difficult to manually fold.
A wheelchair frame including a seat cushion frame, front wheel frame, rear wheel frame and back bracket is designed. Through a bending structure and articulated connection, combined with a latch locking assembly and unlocking mechanism, a more convenient folding method is achieved, allowing single Hands in hand and reduces the space occupied after folding.
This design makes the folding process of the wheelchair more convenient, reduces the difficulty of manual operation, avoids the risk of users bearing self-weight during the folding process, and effectively reduces the space occupied after folding, solving the existing wheelchair or electric wheelchair folding design The shortcomings.
Smart Images
Figure CN222265563U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, in particular to a wheelchair frame and an electric wheelchair. Background Art
[0002] With the continuous increase in the number of elderly people in China and the increasing demand for diversified travel by special disabled groups, electric wheelchairs have gradually become an indispensable means of transportation in the market. Electric wheelchairs are a type of mechanical equipment equipped with an electric drive device based on a traditional hand-cranked wheelchair. Most electric wheelchairs are mainly composed of a wheelchair frame, a drive motor, a controller, and a battery. Unlike traditional wheelchairs, electric wheelchairs have a special interactive structure that allows the wheelchair to move through manual or other forms of instructions, and can complete the action alone without relying on other external assistance.
[0003] The wheelchair frame usually consists of a side frame, a bottom bracket, a seat bracket, a wheel bracket and other parts. The specific bracket distribution structure varies depending on the technical requirements of the wheelchair in terms of load-bearing requirements, folding and storage requirements, etc.
[0004] At present, there are some disadvantages in the folding and storage methods of foldable wheelchairs, which are mainly reflected in the following aspects:
[0005] Although the common folding wheelchair designs on the market can effectively reduce the storage volume of the wheelchair, they still occupy a relatively large space after folding, especially for electric wheelchairs, which have limited effect on reducing the storage volume by folding;
[0006] Secondly, the folding operation of the wheelchair is often not easy to perform manually, and often requires multiple folding and storage steps, as well as the operator's two-handed operation. This shows that in fact, this folding and storage design is not user-friendly enough for the actual user of the wheelchair, and it is difficult for the actual user to perform the folding and storage operation by himself.
[0007] In summary, the folding design of existing wheelchairs or electric wheelchairs has structural defects, resulting in technical problems such as occupying a large storage space and being difficult to fold manually. Utility Model Content
[0008] The technical problem to be solved by the utility model is that the folding design of the existing wheelchair or electric wheelchair has structural defects, resulting in a large storage space being occupied and being difficult to perform manual folding operations.
[0009] In order to solve the above problems, the utility model provides a wheelchair frame, including a seat cushion frame for supporting a wheelchair seat cushion, a front wheel frame for installing and fixing the front wheel, a rear wheel frame for installing and fixing the rear wheel, and a backrest bracket for fixing the backrest cushion, the end position of the front wheel frame is provided with a bending structure in a direction away from the ground, the end position of the backrest bracket is provided with a bending structure in a direction toward the ground, the end of the bending structure of the front wheel frame is rotatably connected to the base of the bending structure of the backrest bracket through a pin shaft, the end of the bending structure of the backrest bracket is rotatably connected to the end of the rear wheel frame through a pin shaft, the end position of the rear wheel frame is located between the end of the front wheel frame and the end of the backrest bracket, and the front wheel frame is located between the end of the front wheel frame and the end of the backrest bracket. the wheelchair frame also includes a latch locking assembly, which includes a movable lock head, a front wheel frame is provided with a lock hole between its respective connection positions with the rear wheel frame and the seat back bracket, and the seat back bracket is provided with a through hole at a position corresponding to the lock hole, for the movable lock head to pass through and enter the lock hole to lock the angle between the seat back bracket and the front wheel frame, the movable lock head is connected to an unlocking mechanism for driving the movable lock head to exit the lock hole to achieve unlocking, and a limited position structure is provided near the end position of the rear wheel frame for limiting the relative rotation angle range of the rear wheel frame and the front wheel frame when the wheelchair is in the unfolded state; the seat cushion frame is located between the front wheel frame and the seat back bracket, and is rotatably connected to the seat back bracket through a pin shaft.
[0010] The novel wheelchair frame design provided by the utility model improves the traditional wheelchair frame design and further folds the wheelchair frame. The wheelchair frame is mainly composed of four parts: a front wheel frame, a rear wheel frame, a seat cushion frame and a seat back support. The end of the seat back support is provided with a downwardly bent structure to cooperate with the upward bending structure of the end of the front wheel frame. The seat back support is hinged to the front wheel frame, the rear wheel frame and the seat cushion frame through three different hinge positions. The position where it is hinged to the rear wheel frame and the seat cushion frame is a general pin hinge structure, and the position where it is hinged to the front wheel frame is a hinge structure through an active lock. The active lock can be withdrawn from the lock hole on the front wheel frame by an unlocking mechanism, thereby releasing the hinge at this position. At this time, the seat back support and the rear wheel frame can be rotated in the direction of the front wheel to realize the folding of the frame. When folding, this frame design only needs to release the lock of the active lock, and then lift the area near the active lock position of the frame upward and in an oblique upward direction away from the front wheel. In this process The rear wheel frame moves closer to the front wheel under the action of its own weight. Similarly, the seat back bracket can also rotate relatively freely after losing the hard angle limit of the two hinge points at the preset intervals. During the lifting and folding process, the seat back bracket will move closer to the seat cushion frame and the front wheel frame, thereby rotating each rotatable bracket structure of the wheelchair frame to the same side to optimize the folding scheme. This design makes the folding method of the wheelchair more convenient to operate. The process of lifting and folding the wheelchair frame only requires one hand. During the folding process, the seat back moves closer to the seat cushion and the rear wheel moves closer to the front wheel, and there is always a stable support between the ground, which can prevent the user from bearing the weight of the wheelchair during the folding operation to avoid danger. In addition, this folding method can fully reduce the space occupied by the frame after folding through the curvature design of the seat back bracket and the front wheel frame itself, effectively solving the structural defects in the folding design of existing wheelchairs or electric wheelchairs, resulting in a large storage space and difficulty in manual folding operations.
[0011] As a preferred solution, the end connection position of the rear wheel frame is provided with a lower notch structure in the thickness direction on the side adjacent to the front wheel frame, and the edge shape of the lower notch structure is concave-convex matched with the outer edge shape of the bending structure of the front wheel frame. The end of the seat back bracket is provided with an upper notch structure in the thickness direction on the side adjacent to the rear wheel frame, and the upper notch structure is concave-convex matched with the upper edge shape of the end of the rear wheel frame to limit the relative rotation angle range between the front wheel frame, the rear wheel frame and the seat back bracket when the wheelchair is in the unfolded state.
[0012] The design optimizes the mutual limiting structure design between the three main support structures in the wheelchair frame, so that the angle of the support of the wheelchair frame can be locked and fixed when the wheelchair frame is in the unfolded state, thereby ensuring the stability of the wheelchair support. The positions where the front wheel frame, the rear wheel frame and the backrest support are overlapped and hinged with each other have a special limiting structure design, and the notch structure at the end of the backrest support and the inner wall of the front wheel frame form a slot-like structure, and the side wall on the other side of the notch at the end of the rear wheel frame can be just inserted into the slot structure, and the notch structure of the backrest support and the rear wheel support are respectively matched with the corresponding outer edge structure of the support end, so as to achieve the angle limiting support for the three support components of the wheelchair frame. This structure firstly provides stable support for the frame when in use and enhances the bearing capacity of the wheelchair. Secondly, the limiting structure is simple, and there is no need to set other additional supporting structures between the various support components, so that the frame needs fewer structures to be released from the limit when folded, and has a smaller dead weight.
[0013] As a preferred solution, one end of the seat cushion frame is rotatably connected to the seat back bracket via a pin, and a supporting connection structure for supporting the height of the seat cushion is provided between the seat cushion frame and the front wheel frame.
[0014] This design optimizes the matching structure between the seat cushion frame, the seat back bracket and the front wheel frame. The front wheel frame and the seat cushion frame are connected by a supporting connection structure, and the two connection points are both pin-rotation connections. In this way, when the frame is folded and stored, the seat cushion frames can move closer to each other in the direction of the front wheel frame, further reducing the thickness of the space occupied after folding.
[0015] As a preferred solution, the wheelchair frame also includes two groups of armrest frames arranged symmetrically, the ends of the armrest frames are rotatably connected to the ends of the front wheel frame on the corresponding sides through pins, and the ends of the armrest frames are connected to the front wheel frame and the backrest frame respectively through the same pin; the armrest frames are also connected to a limit frame to fix the use angle of the armrest frames.
[0016] This design further optimizes the rotating folding design of the frame. The armrest frame is also hinged to the front wheel frame and the seat back bracket through a pin shaft, which makes it convenient to rotate the armrest frame to reduce the thickness of the wheelchair when folding and storing. A limit frame is provided to ensure that the angle of the armrest frame can be well fixed when the armrest frame is in the open state, thereby ensuring the use effect of the wheelchair.
[0017] As a preferred solution, two symmetrically arranged arc-shaped connecting rods are connected between the front wheel frame and the rear wheel frame, each arc-shaped connecting rod is connected to the same side of the front wheel frame and the rear wheel frame, and both ends of the arc-shaped connecting rods are rotatably connected by a pin shaft. This design provides an additional arc-shaped connecting rod on the left and right sides of the front wheel frame and the rear wheel frame, respectively. Since it is connected to the two wheel frames by a rotating shaft, it can not only provide support and fixation between the front wheel frame and the rear wheel frame when the wheelchair frame is unfolded, but also can not affect the mutual approach between the front wheel frame and the rear wheel frame when the frame is stored and folded.
[0018] As a preferred solution, the latch locking assembly includes two groups of symmetrically arranged movable locks, which are used to lock the corresponding sides of the seat back bracket and the front wheel frame at a preset relative angle; the seat back bracket is provided with a lock shell at a position corresponding to the lock hole on its inner side surface, and the lock shell has a lock cavity for accommodating the movable lock along its axial movement, and the lock cavity is provided with a compression spring for pushing the movable lock toward the lock hole to achieve locking.
[0019] This design further optimizes the structural design of the above-mentioned latch locking assembly. The compression spring can make the movable lock head naturally pop out to the side of the outermost front wheel frame, ensuring that the frame can be well fixed after being opened into place, and the structure of the lock shell is set to realize the installation of the compression spring and the direction limitation of the movable lock head.
[0020] As a preferred solution, the unlocking mechanism includes a pull rope structure, the two ends of which are respectively connected to the tail ends of the two movable locks, and the movable locks are pulled out in the direction away from the lock hole by pulling the pull rope structure to achieve unlocking. This design optimizes the structural design of the unlocking mechanism, and cooperates with the lock shell and movable lock design provided above. Since the two movable locks are respectively arranged on the left and right wheel sides of the frame, and each reaches a locked state when it moves toward the lock hole on the outer front wheel frame, unlocking can be achieved when the two movable locks move toward each other. Therefore, by connecting the pull rope structure to the tail ends of the two movable locks, the movable locks can be driven to move and unlock when the pull rope structure is pulled.
[0021] As a preferred solution, the unlocking mechanism also includes an arc-shaped lifting rod, the two ends of which are respectively connected to the two lock shells on both sides of the seat back support, and are used to assist in pulling the pull rope structure by hand, and to lift and fold the wheelchair. This design optimizes the auxiliary structure design for unlocking in conjunction with the wheelchair frame structure, wherein the two ends of the arc-shaped lifting rod are respectively connected to the two lock shells on both sides, and the position of the pull rope structure can be calibrated through this structure, making it convenient for users to pull the pull rope for operation, and when folding the wheelchair frame, it can be achieved by lifting the arc-shaped lifting rod, which is convenient for gripping operation.
[0022] As a preferred solution, both ends of the pull rope structure are provided with rigid limiting ball heads, the tail end of the movable lock is provided with a spherical cavity for accommodating the limiting ball head, the outer edge of the movable lock is provided with a mounting groove connected to the spherical cavity, and the pull rope structure passes through the mounting groove to install the limiting ball head in the spherical cavity. This design optimizes the connection between the pull rope structure and the movable lock head, which is achieved by providing limiting ball head structures at both ends of the pull rope structure. The ball head structure has a larger radial size and can be clamped with the spherical cavity in the movable lock head to ensure that it does not fall out, and the mounting groove connected to the spherical cavity can conveniently install the limiting ball head from one side into the spherical cavity, which is easy to install.
[0023] The utility model also provides an electric wheelchair, comprising a wheelchair frame, a power device and a wheel set device, wherein the wheelchair frame is any of the wheelchair frames described above. Since the wheelchair frame described above has the above beneficial effects, an electric wheelchair having the wheelchair frame should also have corresponding beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 A schematic diagram of the overall structure of a wheelchair frame provided by the utility model;
[0025] Figure 2 for Figure 1 Schematic diagram of the partial support structure of the wheelchair frame;
[0026] Figure 3 for Figure 1 A schematic diagram of the structure of the middle wheelchair frame at the connection between the front wheel frame, the rear wheel frame and the backrest support;
[0027] Figure 4 for Figure 3 A schematic diagram of the outer structure of the middle bracket connection part;
[0028] Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure of the connection part of the middle bracket;
[0029] Figure 6 for Figure 1 A schematic diagram of the end structure of the middle seat back support;
[0030] Figure 7 for Figure 1 A schematic diagram of the end structure of the middle and rear wheel frame;
[0031] Figure 8 for Figure 1 Schematic diagram of the structure of the wheelchair frame in the folded state.
[0032] in, Figure 1-Figure 8 middle:
[0033] 1. Chair back support; 1-1. Upper notch structure; 2. Seat cushion frame; 3. Front wheel frame; 3-1. Lock hole; 4. Rear wheel frame; 4-1. Lower notch structure; 5. Armrest frame; 6. Limit frame; 7. Arc connecting rod; 8. Pull rope structure; 8-1. Limit ball head; 9. Arc lifting rod; 10. Support connection structure; 11. Lock shell; 12. Movable lock head; 12-1. Compression spring; 12-2. Spherical cavity. DETAILED DESCRIPTION
[0034] The technical solution of the utility model will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0035] refer to Figure 1 , Figure 2 and Figure 8 The following embodiments are described, Figure 1 A schematic diagram of the overall structure of a wheelchair frame provided by the utility model; Figure 2 for Figure 1 Schematic diagram of the partial support structure of the wheelchair frame; Figure 8 for Figure 1 Schematic diagram of the structure of the wheelchair frame in the folded state.
[0036] The present embodiment provides a wheelchair frame, comprising a cushion frame 2 for supporting a wheelchair seat cushion, a front wheel frame 3 for installing and fixing a front wheel, a rear wheel frame 4 for installing and fixing a rear wheel, and a backrest bracket 1 for fixing a backrest cushion, the end of the front wheel frame 3 is provided with a bending structure in a direction away from the ground, the end of the backrest bracket 1 is provided with a bending structure in a direction toward the ground, the end of the bending structure of the front wheel frame 3 is rotatably connected to the base of the bending structure of the backrest bracket 1 through a pin shaft, the end of the bending structure of the backrest bracket 1 is rotatably connected to the end of the rear wheel frame 4 through a pin shaft, the end position of the rear wheel frame 4 is located between the end of the front wheel frame 3 and the end of the backrest bracket 1, and the front wheel frame 3 is located on the outside of the wheelchair; the wheelchair frame also includes a latch locking The latch locking assembly comprises a movable lock head 12, a lock hole 3-1 is provided between the front wheel frame 3 and the respective connection positions of the rear wheel frame 4 and the seat back support 1, a through hole is provided at the position corresponding to the lock hole 3-1, for the movable lock head 12 to pass through and enter the lock hole 3-1 to lock the angle between the seat back support 1 and the front wheel frame 3, the movable lock head 12 is connected with an unlocking mechanism for driving the movable lock head 12 to exit the lock hole 3-1 to achieve unlocking, and a limiting structure is provided near the end position of the rear wheel frame 4 for limiting the relative rotation angle range of the rear wheel frame 4 and the front wheel frame 3 when the wheelchair is in the unfolded state; the seat cushion frame 2 is located between the front wheel frame 3 and the seat back support 1, and is rotatably connected to the seat back support 1 through a pin shaft.
[0037] The novel wheelchair frame design provided by the utility model improves the traditional wheelchair frame design and further folding mode. The wheelchair frame is mainly composed of four parts: a front wheel frame 3, a rear wheel frame 4, a seat cushion frame 2 and a seat back frame 1. The end of the seat back frame 1 is provided with a downwardly bent structure to match the upward end bending structure of the front wheel frame 3. The seat back frame 1 is respectively hinged to the front wheel frame 3, the rear wheel frame 4 and the seat cushion frame 2 through three different hinge positions;
[0038] The hinged position with the rear wheel frame 4 and the seat cushion frame 2 is a general pin hinge structure, and the hinged position with the front wheel frame 3 is a hinge structure through a movable lock 12. The movable lock 12 can be withdrawn from the lock hole 3-1 on the front wheel frame 3 through an unlocking mechanism, thereby releasing the hinge at this position. At this time, the seat back bracket 1 and the rear wheel frame 4 can be rotated toward the front wheel, thereby realizing the folding of the frame. When folding, this frame design only needs to release the lock of the movable lock 12, and then lift the area near the position of the movable lock 12 of the frame upward and in an oblique upward direction away from the front wheel. In this process, the rear wheel frame 4 approaches the front wheel under the action of its own weight. Similarly, the seat back bracket 1 can also rotate relatively freely after losing the hard angle limit of the two hinge points separated by a preset spacing. In the process of lifting and folding, the seat back bracket 1 will approach the seat cushion frame 2 and the front wheel frame 3, thereby rotating each rotatable bracket structure of the wheelchair frame to the same side to achieve the optimization of the folding scheme;
[0039] This design makes the wheelchair folding more convenient to operate. The process of lifting and folding the wheelchair frame only requires one hand. During the folding process, the backrest moves closer to the seat cushion and the rear wheels move closer to the front wheels, so that there is always stable support between the backrest and the ground, which can prevent the user from bearing the weight of the wheelchair during the folding operation to avoid danger. In addition, this folding method can fully reduce the space occupied by the frame after folding through the curvature design of the backrest bracket 1 and the front wheel frame 3, effectively solving the technical problems of structural defects in the folding design of existing wheelchairs or electric wheelchairs, resulting in a large storage space and difficulty in manual folding operations.
[0040] refer to Figure 3-Figure 7 The following embodiments are described, Figure 3 for Figure 1 A schematic diagram of the structure of the middle wheelchair frame at the connection between the front wheel frame, the rear wheel frame and the backrest support; Figure 4 for Figure 3 A schematic diagram of the outer structure of the middle bracket connection part; Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure of the connection part of the middle bracket; Figure 6 for Figure 1 A schematic diagram of the end structure of the middle seat back support; Figure 7 for Figure 1 Schematic diagram of the end structure of the middle and rear wheel frame.
[0041] In the technical solution provided in this embodiment, a lower notch structure 4-1 in the thickness direction is provided at the end connection position of the rear wheel frame 4 on the side adjacent to the front wheel frame 3, and the edge shape of the lower notch structure 4-1 is concave-convex matched with the outer edge shape of the bending structure of the front wheel frame 3. The end of the seat back bracket 1 is provided with an upper notch structure 1-1 in the thickness direction on the side adjacent to the rear wheel frame 4, and the upper notch structure 1-1 is concave-convex matched with the upper edge shape of the end of the rear wheel frame 4 to limit the relative rotation angle range between the front wheel frame 3, the rear wheel frame 4 and the seat back bracket 1 when the wheelchair is unfolded.
[0042] The design optimizes the mutual limiting structure design between the three main support structures in the wheelchair frame, so that the angle of the support of the wheelchair frame can be locked and fixed when the wheelchair frame is unfolded, thereby ensuring the stability of the wheelchair support. The positions where the front wheel frame 3, the rear wheel frame 4 and the backrest support 1 overlap and are hinged to each other have a special limiting structure design. The notch structure at the end of the backrest support 1 and the inner wall of the front wheel frame 3 form a slot-like structure, and the side wall on the other side of the end notch of the rear wheel frame 4 can be just inserted into the slot structure, and the notch structure of the backrest support 1 and the rear wheel support is matched with the corresponding outer edge structure of the support end, so as to achieve the angle limiting support for the three support components of the wheelchair frame. This structure firstly provides stable support for the frame when it is in use and enhances the bearing capacity of the wheelchair. Secondly, the limiting structure is simple and there is no need to set other additional supporting structures between the various support components, so that the frame needs fewer structures to be released from the limit when folded, and has a smaller dead weight.
[0043] In the technical solution provided in this embodiment, one end of the seat cushion frame 2 is rotatably connected to the seat back bracket 1 through a pin shaft, and a supporting connection structure 10 for supporting the height of the seat cushion is provided between the seat cushion frame 2 and the front wheel frame 3.
[0044] This design optimizes the matching structure between the seat cushion frame 2, the seat back bracket 1 and the front wheel frame 3. The front wheel frame 3 is connected to the seat cushion frame 2 through a supporting connection structure 10, and the two connection points are both pin-rotatable connections. In this way, when the frame is folded and stored, the seat cushion frame 2 can move closer to each other in the direction of the front wheel frame 3, further reducing the thickness of the space occupied after folding.
[0045] In the technical solution provided in this embodiment, the wheelchair frame also includes two groups of armrest frames 5 arranged symmetrically, and the ends of the armrest frames 5 are rotatably connected to the ends of the front wheel frame 3 on the corresponding sides through pins, and the ends of the armrest frames 5 and the front wheel frame 3 and the backrest frame 1 are connected to each other through the same pin; the armrest frames 5 are also connected to the limiting frame 6 to fix the use angle of the armrest frames 5.
[0046] This design further optimizes the rotating folding design of the frame. The armrest frame 5 is also hinged to the front wheel frame 3 and the seat back support 1 through a pin shaft, which facilitates rotating the armrest frame 5 to reduce the thickness of the wheelchair when folding and storing. A limit frame 6 is provided to ensure that the angle of the armrest frame 5 can be well fixed when the armrest frame 5 is in the open state, thereby ensuring the use effect of the wheelchair.
[0047] In the technical solution provided in this embodiment, two symmetrically arranged arc-shaped connecting rods 7 are connected between the front wheel frame 3 and the rear wheel frame 4, each arc-shaped connecting rod 7 is connected to the same side of the front wheel frame 3 and the rear wheel frame 4, and both ends of the arc-shaped connecting rod 7 are rotatably connected through a pin shaft. This design is to set an additional arc-shaped connecting rod 7 on the left and right sides of each of the front wheel frame 3 and the rear wheel frame 4. Since it is connected to the rotating shaft of both wheel frames, it can not only provide support and fixation between the front wheel frame 3 and the rear wheel frame 4 when the wheelchair frame is unfolded, but also can not affect the mutual approach between the front wheel frame 3 and the rear wheel frame 4 when the frame is stored and folded.
[0048] In the technical solution provided in this embodiment, the latch locking assembly includes two groups of symmetrically arranged movable locks 12, which are used to lock the corresponding sides of the seat back bracket 1 and the front wheel frame 3 at a preset relative angle; the seat back bracket 1 is provided with a lock shell 11 at a position corresponding to the lock hole 3-1 on its inner side surface, and the lock shell 11 has a lock cavity for accommodating the movable lock 12 to move along its axial direction, and the lock cavity is provided with a compression spring 12-1, which is used to push the movable lock 12 out in the direction of the lock hole 3-1 to achieve locking.
[0049] This design further optimizes the structural design of the above-mentioned latch locking assembly. The compression spring 12-1 can make the movable lock head 12 naturally pop out to the side of the outermost front wheel frame 3, ensuring that the frame can be well fixed after being opened into place, and the structure of the lock shell 11 is set to realize the installation of the compression spring 12-1 and the direction limitation of the movable lock head 12.
[0050] In the technical solution provided in this embodiment, the unlocking mechanism includes a pull rope structure 8, and the two ends of the pull rope structure 8 are respectively connected to the tail ends of the two movable locks 12. The movable locks 12 are pulled out in the direction away from the lock hole 3-1 by pulling the pull rope structure 8 to achieve unlocking. This design optimizes the structural design of the unlocking mechanism, and cooperates with the lock shell 11 and the movable lock 12 design provided above. Since the two movable locks 12 are respectively arranged on the left and right wheel sides of the frame, and each reaches a locked state when moving toward the lock hole 3-1 on the outer front wheel frame 3, unlocking can be achieved when the two movable locks move toward each other. Therefore, by connecting the pull rope structure 8 with the tail ends of the two movable locks 12, the movable locks 12 can be driven to move and unlock when the pull rope structure 8 is pulled.
[0051] In the technical solution provided in this embodiment, the unlocking mechanism also includes an arc-shaped lifting rod 9, the two ends of which are respectively connected to the two lock shells 11 on both sides of the seat back support 1, and are used to assist in hand-pulling the pull rope structure 8, and to lift and fold the wheelchair. This design optimizes the auxiliary structure design for unlocking in conjunction with the wheelchair frame structure, wherein the two ends of the arc-shaped lifting rod 9 are respectively connected to the two lock shells 11 on both sides, and the position of the pull rope structure 8 can be calibrated through this structure, which is convenient for the user to pull the pull rope for operation, and when the wheelchair frame is folded, it can be achieved by lifting the arc-shaped lifting rod 9, which is convenient for grasping operation.
[0052] In the technical solution provided in this embodiment, both ends of the pull rope structure 8 are provided with rigid limiting ball heads 8-1, the tail end of the movable lock head 12 is provided with a spherical cavity 12-2 for accommodating the limiting ball head 8-1, and the outer edge of the movable lock head 12 is provided with a mounting groove connected to the spherical cavity 12-2, and the pull rope structure 8 passes through the mounting groove to install the limiting ball head 8-1 in the spherical cavity 12-2. This design optimizes the connection between the pull rope structure 8 and the movable lock head 12, which is achieved by providing the limiting ball head 8-1 structure at both ends of the pull rope structure 8. The structure of the ball head is larger in radial size and can be clamped with the spherical cavity 12-2 in the movable lock head 12 to ensure that it does not fall out, and the mounting groove connected to the spherical cavity 12-2 can conveniently install the limiting ball head 8-1 from one side into the spherical cavity 12-2, which is convenient for installation.
[0053] This embodiment also provides an electric wheelchair, including a wheelchair frame power device and a wheel set device, wherein the wheelchair frame is a wheelchair frame as described in any of the above embodiments. Since the above wheelchair frame has the above beneficial effects, an electric wheelchair having the wheelchair frame should also have corresponding beneficial effects.
[0054] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.
Claims
1. A wheelchair frame, comprising a seat cushion frame (2) for supporting a wheelchair seat cushion, a front wheel frame (3) for mounting and fixing a front wheel, a rear wheel frame (4) for mounting and fixing a rear wheel, and a backrest bracket (1) for fixing a backrest cushion, characterized in that: The end of the front wheel frame (3) is provided with a bending structure facing away from the ground, and the end of the backrest bracket (1) is provided with a bending structure facing the ground. The end of the bending structure of the front wheel frame (3) is rotatably connected to the base of the bending structure of the backrest bracket (1) via a pin shaft. The end of the bending structure of the backrest bracket (1) is rotatably connected to the end of the rear wheel frame (4) via a pin shaft. The end of the rear wheel frame (4) is located between the end of the front wheel frame (3) and the end of the backrest bracket (1). The front wheel frame (3) is located outside the wheelchair. The wheelchair frame also includes a latch locking assembly, which includes a movable lock head (12). The front wheel frame (3) is connected to the rear wheel frame (4) and the backrest bracket (1) at a position between the front wheel frame (3) and the backrest bracket (1). ) are provided with a locking hole (3-1) between their respective connection positions; the seat back bracket (1) is provided with a through hole at a position corresponding to the locking hole (3-1) for the movable lock (12) to penetrate and enter the locking hole (3-1) to lock the angle between the seat back bracket (1) and the front wheel bracket (3); the movable lock (12) is connected with an unlocking mechanism for driving the movable lock (12) to exit the locking hole (3-1) to achieve unlocking; a limiting structure is provided near the end position of the rear wheel bracket (4) for limiting the relative rotation angle range between the rear wheel bracket (4) and the front wheel bracket (3) when the wheelchair is in an unfolded state; the seat cushion frame (2) is located between the front wheel bracket (3) and the seat back bracket (1) and is rotatably connected to the seat back bracket (1) via a pin shaft.
2. The wheelchair frame according to claim 1, characterized in that: The end connection position of the rear wheel frame (4) is provided with a lower notch structure (4-1) in the thickness direction on the side adjacent to the front wheel frame (3), and the edge shape of the lower notch structure (4-1) is concave-convexly matched with the outer edge shape of the bending structure of the front wheel frame (3); the end of the seat back support (1) is provided with an upper notch structure (1-1) in the thickness direction on the side adjacent to the rear wheel frame (4), and the upper notch structure (1-1) is concave-convexly matched with the upper edge shape of the end of the rear wheel frame (4) to limit the relative rotation angle range between the front wheel frame (3), the rear wheel frame (4) and the seat back support (1) when the wheelchair is unfolded.
3. The wheelchair frame according to claim 2, characterized in that: One end of the seat cushion frame (2) is rotatably connected to the seat back bracket (1); a supporting connection structure (10) for supporting the height of the seat cushion is provided between the seat cushion frame (2) and the front wheel frame (3); both ends of the supporting connection structure (10) are rotatably connected to the seat cushion frame (2) and the front wheel frame (3) via pin shafts.
4. The wheelchair frame according to claim 3, characterized in that: The wheelchair frame further comprises two groups of armrest frames (5) which are symmetrically arranged, the ends of the armrest frames (5) being rotatably connected to the ends of the front wheel frame (3) on the corresponding sides via pins, and the ends of the armrest frames (5) and the front wheel frame (3) and the backrest frame (1) are respectively connected via the same pin; the armrest frames (5) are also connected to a limiting frame (6) to fix the use angle of the armrest frames (5).
5. The wheelchair frame according to claim 1, characterized in that: Two symmetrically arranged arc-shaped connecting rods (7) are connected between the front wheel frame (3) and the rear wheel frame (4); each of the arc-shaped connecting rods (7) is connected to the same side of the front wheel frame (3) and the rear wheel frame (4); and both ends of the arc-shaped connecting rods (7) are rotationally connected via a pin shaft.
6. The wheelchair frame according to any one of claims 2 to 5, characterized in that: The latch locking assembly comprises two groups of symmetrically arranged movable locks (12), the movable locks (12) being used to lock the corresponding sides of the seat back support (1) and the front wheel frame (3) to a preset relative angle; the seat back support (1) is provided with a lock housing (11) at a position corresponding to the lock hole (3-1) on its inner side surface, the lock housing (11) having a lock inner cavity for accommodating the movable lock (12) to move along its axial direction, the lock inner cavity being provided with a compression spring (12-1) for pushing the movable lock (12) out in the direction of the lock hole (3-1) to achieve locking.
7. The wheelchair frame according to claim 6, characterized in that: The unlocking mechanism comprises a pull rope structure (8), the two ends of which are respectively connected to the tail ends of the two movable locks (12). The movable locks (12) are pulled out in a direction away from the lock hole (3-1) by pulling the pull rope structure (8) to achieve unlocking.
8. The wheelchair frame according to claim 7, characterized in that: The unlocking mechanism also includes an arc-shaped lifting rod (9), the two ends of which are respectively connected to the two lock shells (11) on both sides of the chair back support (1), and are used to assist in hand-pulling the pull rope structure (8) and lifting to fold the wheelchair.
9. The wheelchair frame according to claim 7, characterized in that: Both ends of the pull rope structure (8) are provided with rigid limiting ball heads (8-1); the tail end of the movable lock head (12) is provided with a spherical cavity (12-2) for accommodating the limiting ball head (8-1); the outer edge of the movable lock head (12) is provided with a mounting groove connected to the spherical cavity (12-2); the pull rope structure (8) passes through the mounting groove to install the limiting ball head (8-1) in the spherical cavity (12-2).
10. An electric wheelchair, comprising a wheelchair frame, a power device and a wheel assembly, characterized in that: The wheelchair frame is the wheelchair frame as described in any one of claims 1-9.