Foldable wheelchair and handle lock assembly thereof
The handle lock assembly for foldable wheelchairs addresses the issue of instability in the folded state by locking the wheelchair securely in both configurations, improving usability and safety.
Patent Information
- Application Number
- CN202420305761.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-19
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-02-19
AI Technical Summary
Conventional foldable wheelchairs cannot be effectively locked in the folded state, leading to instability and inconvenience during transportation.
A handle lock assembly with a rotating shaft, eccentrically arranged shaft hole and limiting ring, and an elastic member to constrain the handle's rotation, allowing the wheelchair to be locked in both folded and unfolded states without tools.
The handle lock assembly ensures stability and safety by locking the wheelchair in both folded and unfolded states, enhancing convenience and safety during use.
Smart Images
Figure CN222195304U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of mobile walking aids, and in particular, relates to a foldable wheelchair and a handle lock assembly thereof. Background Art
[0002] As a mobile aid, a wheelchair can provide strength and freedom for elderly people with limited mobility or people with walking disabilities, thereby improving their quality of life, increasing their independence in life, and maintaining and improving their physical health.
[0003] The foldable wheelchairs currently on the market can be divided into two types according to the folding and storage method of the wheelchair: including left-right folding type and up-down folding type. Among them, due to the inherent limitation of the folding method of the left-right folding type wheelchair, the seat and backrest of the wheelchair can only use soft materials, and the seat cannot be provided with too much filler, resulting in poor riding comfort. Up-down folding wheelchairs do not have this disadvantage, but the up-down folding wheelchairs of the prior art can only be locked in the unfolded state, and cannot be effectively locked in the folded state of the wheelchair, which causes inconvenience to the user when carrying the wheelchair in the folded state. Because the folded wheelchair may be unfolded at any time during the transportation process of the wheelchair, there are great inconveniences and risks, which affect the actual use. Summary of the invention
[0004] The purpose of the embodiments of the present application is to provide a foldable wheelchair and a handle lock assembly thereof, so as to solve the technical problem that the conventional upper and lower foldable wheelchair cannot be locked in the folded state.
[0005] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a handle lock assembly, comprising:
[0006] The handle has a rotating shaft end and a free end for manual operation, wherein the rotating shaft end is provided with a shaft sleeve and a stop block arranged in the shaft sleeve;
[0007] The first connecting member is provided with an axial hole and a limiting ring surrounding the outer circumference of the axial hole, and the shaft sleeve and the limiting ring are sleeved and can rotate relatively;
[0008] A second connecting member is rotatably connected to the first connecting member via a flat shaft, and the flat shaft passes through the shaft hole on the first connecting member and enters into the shaft sleeve of the handle;
[0009] An elastic member connected to the handle, the elastic member is used to constrain the rotation angle of the handle so that the stop block and the outer peripheral surface of the flat shaft are kept in contact with each other;
[0010] Among them, the axial hole and the limiting ring are eccentrically arranged, and when the sleeve rotates relative to the limiting ring, the stop block approaches or moves away from the axial hole, thereby abutting against or separating from the flat shaft entering the sleeve; after the stop block abuts against the flat shaft, the rotation of the second connecting member is restricted, thereby locking the relative rotation angle between the first connecting member and the second connecting member.
[0011] In this way, under the constraint of the elastic member, the stopper in the handle is kept against the outer periphery of the flat shaft, so as to lock the flat shaft, thereby limiting the relative rotation of the first connecting member and the second connecting member. In the unlocking operation, since the shaft hole and the limiting ring are eccentrically arranged, the elastic member is stretched and expanded when the handle is operated, and the stopper is separated from the state of contact with the outer periphery of the flat shaft, releasing the flat shaft. The second connecting member and the first connecting member can rotate relative to each other to achieve the state change of the wheelchair. When rotated to the set state, after the force applied to the handle disappears, such as when the hand is removed, the elastic member recovers and re-constrains the stopper to be against the outer periphery of the flat shaft, and the lock is restored.
[0012] The structure of the flat shaft and the stop block is improved. The flat shaft is a square shaft with a rectangular cross section. The outer periphery of the flat shaft has two opposite long side end faces and transition end faces adjacent to the two long side end faces. The stop block is a rectangular protrusion extending toward the center of the sleeve. The extended end of the stop block has a contact surface for contacting with the long side end faces. The contact surface switches to contact with the two long side end faces on the flat shaft before and after the relative rotation of the first connecting member and the second connecting member. In this way, the contact surface on the stop block is matched with the shape of the long side end faces on the flat shaft to increase the area of the part where the stop block and the outer periphery of the flat shaft can contact each other, which is conducive to tightening the flat shaft and avoiding the relative rotation of the first connecting member and the second connecting member when the flat shaft is locked.
[0013] In one embodiment, a guiding slope is provided between the long side end face and the transition end face on the outer periphery of the flat shaft, so as to prevent the protruding contour on the outer periphery of the flat shaft from easily colliding with the stop block and causing jamming during the rotation of the flat shaft, thereby effectively ensuring the smoothness of the state change operation of the wheelchair.
[0014] In one embodiment, a limiting opening is provided on the limiting ring, and the stop block moves within the range of the limiting opening to further limit the rotatable range of the handle.
[0015] In one embodiment, the handle lock assembly further includes a buffer pad, which is disposed between the limiting ring and the shaft sleeve to provide a buffering effect and a silencing effect to prevent friction between metal parts.
[0016] The matching structure between the first connecting member and the handle is improved, the first connecting member is provided with a limiting protrusion, and the handle is also provided with a protrusion located outside the shaft sleeve, the protrusion is used to abut against the limiting protrusion to limit the rotation range of the handle, so that the handle remains locked to the flat shaft.
[0017] An improvement is made to the structure of the elastic member, wherein the elastic member is a spring, one end of which is connected to the rotating shaft end of the handle, and the other end of which is fixed to the mounting carrier. Thus, when the handle is pulled, the rotating shaft end of the handle stretches the spring and performs an unlocking operation; when the force on the handle disappears, the spring elastically recovers to drive the handle to reset and restore the locking of the flat shaft.
[0018] Another improvement is made to the structure of the elastic member, the elastic member is a torsion spring, the torsion spring presses against the end of the rotating shaft of the handle, so that the abutment block keeps abutting against the flat shaft. In this way, when the handle is operated, the torsion spring can be compressed and the unlocking operation can be achieved. When the force on the handle disappears, the torsion spring elastically recovers to drive the handle to reset and restore the locking of the flat shaft.
[0019] The present application also provides a foldable wheelchair, comprising a backrest assembly, a rear wheel assembly and a handle lock assembly, wherein the handle lock assembly is arranged between the backrest assembly and the rear wheel assembly, wherein a first connecting member in the handle lock assembly is installed and connected to the backrest assembly, and a second connecting member in the handle lock assembly is installed and connected to the rear wheel assembly; the handle lock assembly is arranged such that when the handle is operated to be pulled toward the backrest assembly, the abutment block is released from abutting against the outer periphery of the flat shaft. In this way, the unlocking operation is to pull the handle upwards to unlock, which is simple in operation and convenient to use.
[0020] In one embodiment, the handle is a pull ring, and the handle includes a grip rod and a connecting rod connected to both ends of the grip rod, one end of the connecting rod is used to be movably connected to the limit ring on the first connecting member, and the other end of the connecting rod is connected to the end of the grip rod; the second connecting member has the flat shaft on both sides, the first connecting member has two, and the shaft holes on the two first connecting members are respectively connected to the flat shafts on both sides of the second connecting member. In this way, the handle is a pull ring structure, so that the user can operate the grip rod with one hand to pull the entire handle, and at the same time lift the entire wheelchair to fold or open the operation, thereby improving the convenience of the wheelchair folding operation.
[0021] The beneficial effect of the foldable wheelchair and the handle lock assembly thereof provided by the present application is that, compared with the prior art, the foldable wheelchair of the present application adopts the handle lock assembly, which can lock the wheelchair in the folded or opened state without tools, effectively avoiding the instability of the wheelchair when it is folded or opened, thereby improving the convenience and safety of the wheelchair during use. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0023] Figure 1 Schematic diagram of the foldable wheelchair in the open state provided in the embodiment of the present application Figure 1 ;
[0024] Figure 2 Schematic diagram of the three-dimensional structure of the handle lock assembly provided in the embodiment of the present application Figure 1 ;
[0025] Figure 3 A schematic diagram of the three-dimensional structure of the handle provided in an embodiment of the present application;
[0026] Figure 4 Schematic diagram of the three-dimensional structure of the handle lock assembly provided in the embodiment of the present application Figure 2 ;
[0027] Figure 5 A schematic diagram of the internal structure of the handle lock assembly provided in an embodiment of the present application in the first state (wheelchair open);
[0028] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part A;
[0029] Figure 7 A partial enlarged view of the connection portion between the flat shaft and the shaft hole provided in an embodiment of the present application;
[0030] Figure 8 A view of the connection structure between the handle and the first connecting member provided in an embodiment of the present application;
[0031] Fig. 9 A view of a connection structure between a first connecting member and a second connecting member provided in an embodiment of the present application;
[0032] Fig.10 The schematic diagram of the structure of the elastic member provided in the embodiment of the present application is a torsion spring Figure 1 ;
[0033] Fig.11 The schematic diagram of the structure of the elastic member provided in the embodiment of the present application is a torsion spring Figure 2 ;
[0034] Fig.12 Schematic diagram of the foldable wheelchair in the open state provided in the embodiment of the present application Figure 2 ;
[0035] Fig.13 A three-dimensional structural view of the foldable wheelchair in the folding process provided by an embodiment of the present application;
[0036] Fig.14 A schematic diagram of the folded state structure of a foldable wheelchair provided in an embodiment of the present application;
[0037] Fig.15 for Fig.12 A schematic diagram of the enlarged structure of part B;
[0038] Fig.16 A schematic diagram of the exploded structure of the handle lock assembly provided in an embodiment of the present application;
[0039] Fig.17 A schematic diagram of the internal structure of the handle lock assembly provided in an embodiment of the present application in the second state (the wheelchair is folded);
[0040] Fig.18 This is a schematic diagram of the internal structure of the handle lock assembly provided in an embodiment of the present application in the third state (after the wheelchair is folded).
[0041] Among them, the reference numerals in the figure are:
[0042] 100-handle lock assembly; 200-backrest assembly; 300-rear wheel assembly; 400-armrest assembly; 500-seat assembly; 600-support assembly; 700-footrest assembly; 800-front wheel assembly;
[0043] 1-handle; 11-rotating shaft end; 111-fixing hole; 12-free end; 13-sleeve; 14-block; 141-contact surface; 15-protrusion; 16-hand grip rod; 17-connecting rod;
[0044] 2-first connecting member; 21-axial hole; 22-limiting ring; 221-limiting opening; 222-inclined surface; 23-limiting protrusion;
[0045] 3-second connecting member; 31-flat shaft; 32-long side end surface; 33-transition end surface; 34-guide slope;
[0046] 4-elastic member; 41-spring; 42-torsion spring;
[0047] 5- Cushion. DETAILED DESCRIPTION
[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0050] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0052] Traditional foldable wheelchairs can only be locked when they are unfolded for use, but cannot be effectively locked when they are folded. This causes inconvenience to users when carrying the folded wheelchair, because the folded wheelchair may be unfolded at any time during the transportation process, which causes great inconvenience and risk of use.
[0053] Herein, the embodiments of the present application provide a novel foldable wheelchair and a handle lock assembly thereof, which can be folded up and down for storage without tools, and can also be locked in the unfolded and folded states, thereby improving the convenience and safety of the wheelchair during use, and effectively solving the technical problem that the traditional foldable wheelchair cannot be locked in the folded state. A detailed description is now given.
[0054] Please also read Figure 1 and Figure 2A foldable wheelchair is provided with a handle lock assembly 100 provided in an embodiment of the present application. The handle lock assembly 100 comprises a handle 1, a first connecting member 2, a second connecting member 3 and an elastic member 4.
[0055] See also Figure 3 The handle 1 has a shaft end 11 and a free end 12 for manual operation. The shaft end 11 is provided with a shaft sleeve 13, and the shaft sleeve 13 is provided with a stop block 14.
[0056] Please also read Figure 1 and Figure 4 The first connecting member 2 may be a component installed and connected to the backrest assembly 200 on the wheelchair. The first connecting member 2 is provided with an axial hole 21 and a limiting ring 22 at one end thereof for installing and connecting to the second connecting member 3 and the handle 1. The limiting ring 22 is arranged around the outer circumference of the axial hole 21. The shaft sleeve 13 on the handle 1 is sleeved with the limiting ring 22 on the first connecting member 2 and can rotate relative to each other so as to provide a hand-lifting operation.
[0057] Please also read Figure 1 , Figure 4 and Figure 5 The second connecting member 3 can be a component installed and connected to the rear wheel assembly 300 on the wheelchair. The second connecting member 3 is used to be installed and connected to the first connecting member 2 and the handle 1. A flat shaft 31 is provided on one end. The second connecting member 3 is rotatably connected to the first connecting member 2 through the flat shaft 31. The flat shaft 31 passes through the axial hole 21 on the first connecting member 2 and enters the shaft sleeve 13 of the handle 1, so that the outer periphery of the flat shaft 31 can be against the block 14.
[0058] Please also read Figure 5 and Figure 6 The elastic member 4 is connected to the handle 1, and is used to constrain the rotation angle of the handle 1, so that the stop block 14 on the handle 1 keeps contact with the outer peripheral contour of the flat shaft 31 to lock the flat shaft 31, thereby limiting the relative rotation between the second connecting member 3 and the first connecting member 2.
[0059] Among them, Figure 6 As shown, the shaft hole 21 and the limiting ring 22 on the first connecting member 2 are eccentrically arranged. When the sleeve 13 rotates relative to the limiting ring 22, the stopper 14 approaches or moves away from the shaft hole 21, thereby abutting against or separating from the flat shaft 31 entering the sleeve 13. After the stopper 14 abuts against the flat shaft 31, the rotation of the second connecting member 3 is restricted, thereby locking the relative rotation angle between the first connecting member 2 and the second connecting member 3.
[0060] Compared with the prior art, the handle lock assembly 100 provided in the embodiment of the present application is characterized in that the first connecting member 2, the second connecting member 3 and the handle 1 are connected to each other by a flat shaft 31, wherein the handle 1 is sleeved on the limiting ring 22 of the first connecting member 2 by a sleeve 13, so that the handle 1 can rotate relative to the first connecting member 2, thereby forming a structure for people to carry and pull. The flat shaft 31 on the second connecting member 3 passes through the shaft hole 21 on the first connecting member 2 and enters the sleeve 13 of the handle 1, so that the outer peripheral contour of the flat shaft 31 can be abutted against the abutment 14 in the sleeve 13 to lock the rotation angle between the first connecting member 2 and the second connecting member 3, which is conducive to the locking operation of the wheelchair when it is folded or opened, and effectively ensures the stability of the wheelchair when it is folded or opened.
[0061] In the unlocking operation, since the shaft hole 21 and the limiting ring 22 are eccentrically arranged, as shown in FIG. Figure 5 As shown, when the handle 1 is operated (such as when the handle 1 is pulled in the direction of F1), the elastic member 4 is stretched and expanded in the direction of F2, and the stopper 14 can be separated from the state of contact with the outer periphery of the flat shaft 31, releasing the flat shaft 31. The second connecting member 3 can be relatively rotated with the first connecting member 2 in the direction of F3 to achieve the state change operation of the wheelchair. When it rotates to the set state, the force exerted by the human hand on the handle 1 disappears, and the elastic member 4 recovers and re-constrains the stopper 14 in the handle 1 to contact the outer periphery of the flat shaft 31, and the lock is restored.
[0062] It can be seen that the handle lock assembly 100 of the present application can lock the wheelchair in the folded or opened state without tools, effectively avoiding the instability of the wheelchair when it is folded or opened, thereby improving the convenience and safety of the wheelchair during use.
[0063] For the specific structure of the flat shaft 31 and the stop block 14, please refer to the embodiment of the present application. Figure 7 The flat shaft 31 is preferably a square shaft with a rectangular cross section. The outer periphery of the flat shaft 31 has two opposite long side end surfaces 32 and transition end surfaces 33 adjacent to and connected to the two long side end surfaces 32 .
[0064] The transition end surface 33 may preferably be an arc-shaped end surface or a trapezoidal end surface, so that the stopper 14 can smoothly transition between the long side end surfaces 32 on both sides.
[0065] Please also read Figure 3 , Figure 6 and Figure 7The stop block 14 is preferably a rectangular protrusion extending toward the center of the sleeve 13. The extended end of the stop block 14 has a contact surface 141 for abutting against the long side end surface 32 on the flat shaft 31. The contact surface 141 switches to abut against the long side end surfaces 32 on both sides of the flat shaft 31 before and after the first connecting member 2 and the second connecting member 3 rotate relative to each other.
[0066] In this way, the contact surface 141 on the stop block 14 is matched with the shape of the long side end surface 32 on the flat shaft 31 to increase the area where the stop block 14 and the outer periphery of the flat shaft 31 can stop each other, which is beneficial for tightening the flat shaft 31 and avoiding relative rotation between the first connecting member 2 and the second connecting member 3 when locking the flat shaft 31.
[0067] Preferably, if Figure 7 As shown, there is preferably a guiding bevel 34 between the long side end face 32 and the transition end face 33 on the outer periphery of the flat shaft 31. The guiding bevel 34 makes the outer periphery contour of the flat shaft 31 transitioning from the long side end face 32 to the transition end face 33, or from the transition end face 33 to the other side long side end face 32, smooth, thereby preventing the protruding contour on the outer periphery of the flat shaft 31 from easily colliding with the stop block 14 and causing it to get stuck during the rotation of the flat shaft 31, thereby effectively ensuring the smoothness of the state change operation of the wheelchair.
[0068] For the matching structure between the limiting ring 22 on the first connecting member 2 and the shaft sleeve 13, please refer to the embodiment of the present application. Figure 6 and Figure 7 A limiting opening 221 is provided on the limiting ring 22 so that the limiting ring 22 is a limiting arc structure outside the shaft hole 21, allowing the stop block 14 to move within the range of the limiting opening 221 to further limit the rotatable range of the handle 1.
[0069] Preferably, the ends of the limiting ring 22 at both ends of the limiting opening 221 also have inclined surfaces 222 , which cooperate with the side profile of the stop block 14 so as to stop with the stop block 14 and effectively limit the travel of the stop block 14 in the limiting opening 221 .
[0070] In other embodiments of the present application (not shown), the limiting ring 22 is a full circle surrounding the outer circumference of the shaft hole 21, and the sleeve 13 on the handle 1 is sleeved inside the limiting ring 22, so that the stop block 14 can be against the outer circumferential contour of the flat shaft 31.
[0071] In order to improve the durability of the wheelchair, each part of the wheelchair can be made of metal. Since the parts rotate relative to each other when the wheelchair is folded or opened, the metal parts rub against each other, which is easy to cause damage or noise, affecting the use.
[0072] Here, in one embodiment of the present application, please refer to Figure 6 and Figure 7 The handle lock assembly 100 provided in the embodiment of the present application further includes a buffer pad 5, which is arranged between the limiting ring 22 and the shaft sleeve 13, so as to play a buffering role and a silencing effect to avoid friction between metal parts during the relative rotation of the limiting ring 22 and the shaft sleeve 13.
[0073] In this embodiment, if Figure 7 As shown, the cushion pad 5 matches the shape of the limiting ring 22 and is arranged around the outer circumference of the limiting ring 22. When the sleeve 13 on the handle 1 is sleeved on the limiting ring 22, the cushion pad 5 is placed between the limiting ring 22 and the sleeve 13 to play a buffering role.
[0074] For the matching structure between the first connecting member 2 and the handle 1, in one embodiment of the present application, please refer to Figure 8 and Fig. 9 A limiting protrusion 23 is provided on the first connecting member 2, and a protrusion 15 located outside the shaft sleeve 13 is also provided on the handle 1. The protrusion 15 can abut against the limiting protrusion 23 to limit the rotation range of the handle 1, so that the handle 1 remains locked to the flat shaft 31.
[0075] In this embodiment, please combine Figure 5 , Figure 8 and Fig. 9 As shown, when the limiting protrusion 23 on the first connecting member 2 abuts against the protrusion 15 on the handle 1, the abutment 14 in the handle 1 and the outer circumferential long side end surface 32 of the flat shaft 31 also abut tightly. At this time, it is limited to only the lifting action of the handle 1, that is, Figure 5 The handle 1 is lifted in the F1 direction shown in the figure, and the elastic member 4 is stretched and expanded in the F2 direction. Since the shaft hole 21 and the limiting ring 22 are eccentrically arranged, when the handle rotates in the F1 direction, the stopper 14 can be separated from the outer circumference of the flat shaft 31, thereby unlocking the flat shaft 31 and allowing the second connecting member 3 to rotate relative to the first connecting member 2 in the F3 direction; otherwise, under the force of the elastic member 4, the stopper 14 of the handle 1 remains pressed against the flat shaft 31, and the limiting protrusion 23 on the first connecting member 2 and the protrusion 15 on the handle 1 also abut against each other, so that the second connecting member 3 and the first connecting member 2 cannot rotate relative to each other, effectively ensuring the stability of the locked state.
[0076] The structure of the elastic member 4 and its installation structure include but are not limited to the following forms:
[0077] In one embodiment of the present application, please refer to Figure 5 and Figure 6 The elastic member 4 is preferably a spring 41, one end of the spring 41 is installed and connected to the shaft end 11 on the handle 1, and the other end of the spring 41 is fixed on the installation carrier.
[0078] In this embodiment, a fixing hole 111 is provided on the rotating shaft end 11 of the handle 1, so that a hook at one end of the spring 41 can be buckled on the fixing hole 111; the other end of the spring 41 is hooked on the fixing column M of the mounting carrier. The "mounting carrier" here can be the first connecting member 2, or other parts mounted and connected to the first connecting member 2, which is not specifically limited here.
[0079] Thus, when the handle 1 is operated and pulled, the shaft end 11 of the handle 1 stretches the spring 41, and at the same time, the stop block 14 in the handle 1 is separated from the state of abutting against the outer periphery of the flat shaft 31, releasing the flat shaft 31, allowing the flat shaft 31 to rotate freely, thereby realizing the unlocking operation; when the force on the handle 1 disappears, such as when a person's hand is removed from the handle 1, the spring 41 elastically recovers to drive the shaft end 11 of the handle 1 to return to its original position, and restores the constraint that the stop block 14 in the handle 1 abuts against the outer periphery of the flat shaft 31, thereby restoring the locking of the flat shaft 31.
[0080] In another embodiment of the present application, please refer to Fig.10 and Fig.11 The elastic member 4 is preferably a torsion spring 42 , and the force output end of the torsion spring 42 presses against the rotating shaft end 11 of the handle 1 , so that the stop block 14 remains in contact with the flat shaft 31 .
[0081] When a person pulls the handle 1, the torsion spring 42 is compressed, and the block 14 in the handle 1 is separated from the state of contact with the outer periphery of the flat shaft 31, releasing the flat shaft 31, allowing the flat shaft 31 to rotate freely, thereby achieving an unlocking operation. When the force on the handle 1 disappears, such as when the person's hand is removed from the handle 1, the torsion spring 42 elastically recovers to drive the rotating shaft end 11 of the handle 1 to return to its original position, and restores the constraint that the block 14 in the handle 1 is in contact with the outer periphery of the flat shaft 31, thereby locking the flat shaft 31.
[0082] For the overall structure of the foldable wheelchair, please refer to the embodiments of the present application. Fig.12 , Fig.13 and Fig.14 The foldable wheelchair of the present application is an upper and lower foldable wheelchair, including a handle lock assembly 100, a backrest assembly 200, a rear wheel assembly 300, an armrest assembly 400, a seat assembly 500, a support assembly 600, a footrest assembly 700 and a front wheel assembly 800 of the present application.
[0083] The armrest assembly 400 is fixed to the backrest assembly 200 and can rotate around it at a limited angle to facilitate the user to sit on the wheelchair from the side.
[0084] The pedal assembly 700 is fixed on the front wheel assembly 800, and the pedal assembly 700 can be rotated and stored around the front wheel assembly 800 to reduce the occupied space.
[0085] The above-mentioned backrest assembly 200, seat assembly 500, support assembly 600, front wheel assembly 800 and rear wheel assembly 300 are all connected by pins or screws, so that the connection parts between the components can rotate around the axis point to achieve overall folding and storage.
[0086] The handle lock assembly 100 provided in the embodiment of the present application is disposed at the shaft connection portion between the backrest assembly 200 and the rear wheel assembly 300. Fig.12 and Fig.15 As shown, the first connecting member 2 in the handle lock assembly 100 is installed and connected with the backrest assembly 200, and the second connecting member 3 in the handle lock assembly 100 is installed and connected with the rear wheel assembly 300, wherein the angle of the first connecting member 2 relative to the backrest assembly 200 does not change, and the wheelchair is locked as a whole after the rotation angle of the first connecting member 2 and the second connecting member 3 is locked. The handle lock assembly 100 is configured so that when the handle 1 is operated to be pulled in the direction of the backrest assembly 200, the abutment block 14 is released from abutting against the outer periphery of the flat shaft 31. The unlocking operation is to pull the handle upwards to unlock, which is simple to operate and easy to use.
[0087] In the embodiments of this application, please refer to Fig.15 and Fig.16 The handle 1 is preferably a pull ring structure, and the handle 1 includes a grip rod 16 and a connecting rod 17 connected to both ends of the grip rod 16, and the two ends of each connecting rod 17 are respectively the rotating shaft end 11 and the free end 12, and the rotating shaft end 11 of each connecting rod 17 is used to be movably connected to the limiting ring 22 on the first connecting member 2, and the free end 12 of each connecting rod 17 is connected to the end of the grip rod 16.
[0088] The second connecting member 3 has a flat shaft 31 on both sides thereof. The first connecting member 2 has two shaft holes 21 on the two first connecting members 2 respectively penetrate the flat shafts 31 on both sides of the second connecting member 3 .
[0089] Thus, the handle 1 is a pull ring structure, so that the user can operate the hand grip 16 with one hand to pull the entire handle 1, and at the same time lift the entire wheelchair to fold or unfold it, thereby improving the convenience of the wheelchair folding operation.
[0090] The working principle of the entire handle lock assembly 100 is described in detail below in combination with the above overall structure:
[0091] Please also read Figure 5 , Figure 7 , Fig.12 , the wheelchair is in the open state, at this time, the long side end surface 32 of the outer periphery of the flat shaft 31 in the handle lock assembly 100 and the block 14 in the sleeve 13 of the handle 1 are kept against each other under the action of the elastic member 4; at the same time, Figure 6 and Figure 8 As shown, the upper limit projection 23 of the first connecting member 2 and the projection 15 on the handle 1 also keep against each other to limit the relative rotation between the first connecting member 2 and the second connecting member 3, that is, the backrest assembly 200 and the rear wheel assembly 300 cannot be folded in the forward direction of the wheelchair, thereby locking the open state of the wheelchair.
[0092] Please also read Figure 5 and Fig.12 When the user pulls the handle 1 upward (ie, in the direction F1 where the backrest assembly 200 is located), the elastic member 4 is expanded downward in the direction F2. Since the shaft hole 21 and the limiting ring 22 on the first connecting member 2 are eccentrically arranged, the stopper 14 can be directly pulled apart, that is, separated from the state of contact with the outer periphery of the flat shaft 31, and the flat shaft 31 is released. At this time, if Figure 5 , Fig.13 and Fig.17 As shown, the second connecting member 3 can rotate relative to the first connecting member 2 in the rotation direction of F3, that is, the backrest assembly 200 and the rear wheel assembly 300 can be folded in the forward direction of the wheelchair. In actual operation, when a person pulls the handle 1, the entire wheelchair can be lifted up simultaneously, and the backrest assembly 200 and the rear wheel assembly 300 can be naturally folded by gravity, which is conducive to one-handed operation. Other components on the wheelchair can be folded and stored as needed.
[0093] Please also read Fig.14 and Fig.18 When the backrest assembly 200 and the rear wheel assembly 300 are folded into place, the hand can be removed from the handle 1, and the elastic member 4 recovers and drives the handle 1 to reset, so that the stopper 14 in the sleeve 13 of the handle 1 is restrained by the elastic member 4 and is restored to be pressed against the outer periphery of the flat shaft 31. Since the second connecting member 3 rotates relative to the first connecting member 2, the second connecting member 3 rotates together with the flat shaft 31, so the stopper 14 in this state abuts against the other long side end face 32 of the flat shaft 31; at the same time, Figure 8 and Fig.18 As shown, the protrusion 15 outside the handle 1 and the limiting protrusion 23 on the first connecting member 2 also keep against each other to lock the handle 1. In this way, the folded state of the wheelchair is locked.
[0094] like Fig.18 As shown, when the wheelchair needs to be reopened, the handle 1 can be lifted in the direction of F1 to unlock the flat shaft 31 again, so that the second connecting member 3 and the first connecting member 2 can rotate relative to each other in the opposite direction of F3. After the components on the wheelchair are opened, the handle 1 can be released to restore the wheelchair to the open state and lock it.
[0095] It can be seen that in the foldable wheelchair provided in the embodiment of the present application, the structure of the handle lock assembly 100 is very simple, and no auxiliary tools are required, and the unlocking operation can be performed by hand. Whether the wheelchair is in the open state or in the folded state, the unlocking operation can be completed by pulling the handle 1, which is simple to operate and is conducive to the state change operation of the wheelchair with one hand, effectively improving the convenience and safety of the wheelchair during use.
[0096] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A handle lock assembly, It is characterized in that include: The handle has a rotating shaft end and a free end for manual operation, wherein the rotating shaft end is provided with a shaft sleeve and a stop block arranged in the shaft sleeve; The first connecting member is provided with an axial hole and a limiting ring surrounding the outer circumference of the axial hole, and the shaft sleeve and the limiting ring are sleeved and can rotate relatively; A second connecting member is rotatably connected to the first connecting member via a flat shaft, and the flat shaft passes through the shaft hole on the first connecting member and enters into the shaft sleeve of the handle; An elastic member connected to the handle, the elastic member is used to constrain the rotation angle of the handle so that the stop block and the outer peripheral surface of the flat shaft are kept in contact with each other; Among them, the axial hole and the limiting ring are eccentrically arranged, and when the sleeve rotates relative to the limiting ring, the stop block approaches or moves away from the axial hole, thereby abutting against or separating from the flat shaft entering the sleeve; after the stop block abuts against the flat shaft, the rotation of the second connecting member is restricted, thereby locking the relative rotation angle between the first connecting member and the second connecting member.
2. The handle lock assembly according to claim 1, Features: The flat shaft is a square shaft with a rectangular cross-section, and has two opposite long side end faces and transition end faces adjacent to the two long side end faces on its outer circumference; the stop block is a rectangular protrusion extending toward the center of the sleeve, and has a contact surface for abutting against the long side end faces on the extended end of the stop block, and the contact surface switches to abut against the two long side end faces on the flat shaft before and after the relative rotation of the first connecting member and the second connecting member.
3. The handle lock assembly according to claim 2, Features: A guiding inclined surface is also provided between the long side end surface and the transition end surface on the outer periphery of the flat shaft.
4. The handle lock assembly according to claim 1, Features: The limiting ring is provided with a limiting opening, and the stop block moves within the range of the limiting opening.
5. The handle lock assembly according to claim 1, Features: The handle lock assembly further comprises a buffer pad, which is arranged between the limiting ring and the shaft sleeve.
6. The handle lock assembly according to claim 1, Features: The first connecting member is provided with a limiting protrusion, and the handle is further provided with a protrusion outside the shaft sleeve, and the protrusion is used to abut against the limiting protrusion.
7. The handle lock assembly according to claim 1, Features: The elastic member is a spring, one end of the spring is connected to the rotating shaft end of the handle, and the other end of the spring is fixed to the installation carrier.
8. The handle lock assembly according to claim 1, Features: The elastic member is a torsion spring, and the torsion spring presses against the rotating shaft end of the handle to keep the abutment block in contact with the flat shaft.
9. A foldable wheelchair, It is characterized in that The invention comprises a backrest assembly, a rear wheel assembly and a handle lock assembly as claimed in any one of claims 1 to 8, wherein the handle lock assembly is arranged between the backrest assembly and the rear wheel assembly, a first connecting member in the handle lock assembly is installed and connected to the backrest assembly, and a second connecting member in the handle lock assembly is installed and connected to the rear wheel assembly; and the handle lock assembly is arranged to release the abutment block from abutting against the outer periphery of the flat shaft when the handle lock assembly is pulled toward the backrest assembly.
10. The foldable wheelchair according to claim 9, Features: The handle is a pull ring, and the handle includes a grip rod and a connecting rod connected to both ends of the grip rod, one end of the connecting rod is used to be movably connected to the limit ring on the first connecting member, and the other end of the connecting rod is connected to the end of the grip rod; the second connecting member has the flat shaft on both sides, and the first connecting member has two, and the axial holes on the two first connecting members are respectively connected with the flat shafts on both sides of the second connecting member.