Armrest mechanism and folding wheelchair
By setting the operating handle and locking pin on the armrest of the wheelchair, the problem that the existing folding wheelchair armrest cannot be folded separately is solved, and the independent folding and unfolding of the armrest is achieved, which improves the convenience of use.
Patent Information
- Application Number
- CN202421145718.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-05-23
AI Technical Summary
When the existing folding wheelchair is unfolded, the handrails cannot be folded separately, which makes it inconvenient to use, especially when getting on and off the car, which is easily blocked by the handrails.
A handrail mechanism including a handrail folding bracket, a handrail, a locking pin and an operating handle are designed. By setting an operating handle on the handrail and connecting the locking pin to the operation handle, the flip of the operating handle can drive the locking pin to be inserted into or removed from the handrail folding bracket, thereby achieving independent folding and unfolding of the handrail.
The independent folding and unfolding of the handrail is realized, which simplifies operation and is more convenient to use, and avoids the inconvenience caused by the handrail during use.
Smart Images
Figure CN222899518U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a wheelchair, in particular to an armrest mechanism and a folding wheelchair. Background Art
[0002] Generally, the volume of a wheelchair is very large, and it is usually folded to reduce its volume for convenient storage. However, existing folding wheelchairs usually use only one driving device to drive the folding of the whole vehicle. For example, the folding of the armrest of the wheelchair usually folds along with the folding of the whole wheelchair. When the whole wheelchair is in the unfolded state, the armrest is in the open state, and it is impossible to fold the armrest alone, which may hinder the user from getting on and off the vehicle and is not convenient to use. Summary of the Utility Model
[0003] The purpose of the utility model is to provide an armrest mechanism that can be folded or unfolded, with a simple structure and convenient use.
[0004] Another purpose of the utility model is to provide a folding wheelchair with a simple structure and convenient use.
[0005] To achieve the above purposes, the armrest mechanism provided by the utility model includes an armrest folding bracket, an armrest, a locking pin and an operating handle. The armrest folding bracket is connected to the armrest. The locking pin is movably arranged between the armrest and the armrest folding bracket, and the locking pin is connected to the operating handle. The operating handle is arranged on one side of the armrest to be turned up and down, so as to drive the locking pin to insert into or leave the armrest folding bracket, realizing the locking or unlocking of the armrest folding bracket.
[0006] Compared with the prior art, by arranging an operating handle on the armrest, making the operating handle arranged on one side of the armrest to be turned up and down, and connecting the locking pin to the operating handle, when the operating handle is turned, it can drive the locking pin to insert into or disengage from the armrest folding bracket, thus realizing the locking or unlocking of the armrest folding bracket. The structure of the whole armrest mechanism is very simple, and only by operating the operating handle can the armrest be folded or opened, which is very convenient to use.
[0007] Preferably, the armrest folding bracket includes a first connecting rod and a second connecting rod. The lower end of the first connecting rod is pivotally connected to the frame of the folding wheelchair, the upper end of the first connecting rod is pivotally connected to the armrest, the lower end of the second connecting rod is pivotally connected to the frame of the folding wheelchair, the upper end of the second connecting rod is pivotally connected to the armrest, and a deformable quadrilateral structure is formed among the first connecting rod, the second connecting rod, the armrest and the frame of the folding wheelchair.
[0008] Preferably, the armrest folding bracket is provided with a jack, and the locking pin is movably arranged between the armrest and the jack to lock or unlock the armrest folding bracket.
[0009] Specifically, the extending direction of the pivot axis of the operating handle is along the front-back direction of the armrest. One side of the operating handle is provided with a sliding groove, and the extending direction of the sliding groove is along the up-down direction of the armrest. One end of the locking pin is slidably arranged in the sliding groove.
[0010] Specifically, the sliding groove is a T-shaped groove, and the end of the locking pin is a T-shaped head that cooperates with the T-shaped groove.
[0011] Specifically, the depth of the T-shaped groove is greater than the thickness of the T-shaped head.
[0012] Specifically, a limiting groove is circumferentially arranged on the outer side of one end of the locking pin close to the T-shaped head, and the opening edge of the T-shaped groove is clamped in the limiting groove.
[0013] Specifically, the width of the limiting groove is greater than the thickness of the opening edge of the T-shaped groove.
[0014] Preferably, a guiding hole is provided on the armrest. The diameters of the openings at both ends of the guiding hole are smaller than the inner diameter of the middle hole. The locking pin slidably passes through the guiding hole. A limiting flange with a diameter larger than the opening of the guiding hole and smaller than the middle hole is arranged on the outer side of the locking pin, and the limiting flange is arranged in the middle hole of the guiding hole.
[0015] Preferably, the armrest mechanism further includes an elastic resetting member, and the elastic resetting member is arranged between the locking pin and the armrest.
[0016] A folding wheelchair includes a frame and an armrest mechanism, and the armrest folding bracket of the armrest mechanism is arranged on the frame. Description of the Drawings
[0017] Figure 1 is a structural diagram of the folding wheelchair of the present invention when unfolded.
[0018] Figure 2 is a structural diagram of the armrest mechanism of the folding wheelchair of the present invention.
[0019] Figure 3 is an internal structural diagram of the armrest mechanism of the folding wheelchair of the present invention.
[0020] Figure 4 is an exploded view of the armrest mechanism of the folding wheelchair of the present invention.
[0021] Figure 5 is Figure 2 a sectional view taken along the A-A direction in
[0022] Figure 6 is Figure 5 The state diagram of the armrest mechanism of
[0023] Figure 7 The state diagram of the folding wheelchair of the present utility model after folding. Detailed implementation manners
[0024] To describe in detail the technical content, structural features, and achieved effects of the present utility model, the following is a detailed description in conjunction with the implementation manners and with reference to the accompanying drawings.
[0025] As Figure 1 shown, the folding wheelchair 100 of the present utility model includes a frame 110, and the frame 110 includes a front bracket 1, a rear bracket 2, and a seat plate 3. The front bracket 1 is pivotally connected to the rear bracket 2 to form a herringbone structure. The lower end of the front bracket 1 is provided with a front wheel 101, and both sides of the lower end of the rear bracket 2 are respectively provided with rear wheels 102. The seat plate 3 is disposed on the rear bracket 2.
[0026] Please refer to again Figures 2 to 5, the folding wheelchair 100 further includes an armrest mechanism 8, and the armrest mechanism 8 is disposed on the frame. Specifically, the armrest mechanism 8 is disposed on the rear bracket 2. The armrest mechanism 8 includes an armrest folding bracket 8a, an armrest 83, a locking pin 84, and an operation handle 85. The armrest folding bracket 8a is connected to the armrest 83, and the armrest folding bracket 8a is disposed on the frame 110. More specifically, the armrest folding bracket 8a is disposed on the rear bracket 2. Of course, the armrest folding bracket 8a may also be disposed on the seat plate 3. The locking pin 84 is movably disposed between the armrest 83 and the armrest folding bracket 8a. One end of the locking pin 84 is connected to the operation handle 85. The operation handle 85 is disposed on one side of the armrest 83 and can be turned up and down to drive the locking pin 84 to insert into or leave the armrest folding bracket 8a, so as to lock or unlock the armrest folding bracket 8a. The armrest folding bracket 8a includes a first link 81 and a second link 82. The lower end of the first link 81 is pivotally connected to the rear bracket 2, the upper end of the first link 81 is pivotally connected to the armrest 83, the lower end of the second link 82 is pivotally connected to the rear bracket 2, and the upper end of the second link 82 is pivotally connected to the armrest 83. A deformable quadrilateral structure is formed among the first link 81, the second link 82, the armrest 83, and the rear bracket 2. The armrest folding bracket 8a is provided with the insertion hole 811. Specifically, the insertion hole 811 is provided on one of the first link 81 and the second link 82. The locking pin 84 is movably disposed between the armrest 83 and the insertion hole 811 to lock or unlock the armrest folding bracket 8a. An operation handle 85 is pivotally connected to one side of the armrest 83. The locking pin 84 is disposed on the operation handle 85. When the operation handle 85 is turned, it can drive the locking pin 84 to insert into or leave the insertion hole of one of the first link 81 and the second link 82, so as to lock or unlock the armrest folding bracket 8a. In this embodiment, the insertion hole 811 is provided on the first link 81.
[0027] Please refer to Figure 5 and Figure 6, the extending direction of the pivot axis of the operating handle 85 is along the front-back direction of the armrest 83, so that the operating handle 85 can be turned up and down, thus facilitating the user to manually operate the operating handle 85. A sliding groove 851 is provided inside the operating handle 85, and the direction of the sliding groove 851 is along the up-down direction of the armrest 83. One end of the locking pin 84 is slidably arranged in the sliding groove 851. The lower end of the sliding groove 851 is closed and the upper end is open to facilitate the installation of the locking pin 84. In this way, when the operating handle 85 is turned to drive the locking pin 84, the locking pin 84 can slide out of the jack 811 to ensure the stable operation of locking or unlocking. The sliding groove 851 is a T-shaped groove, and the end of the locking pin 84 is a T-shaped head 841 that matches the T-shaped groove. The depth of the T-shaped groove is greater than the thickness of the T-shaped head 841. Since the angle of the locking pin 84 relative to the operating handle 85 changes when the operating handle 85 is turned, the T-shaped head 841 will swing in the T-shaped groove. Therefore, by making the depth of the T-shaped groove greater than the thickness of the T-shaped head 841, enough space can be left for the T-shaped head 841 to swing in the T-shaped groove to prevent interference and jamming between the two. A limiting groove 842 is circumferentially provided on the outer side of one end of the locking pin 84 close to the T-shaped head 841, and the opening edge of the T-shaped groove is stuck in the limiting groove 842. The limiting groove 842 can limit the length of the locking pin 84 extending out of the operating handle 85 and prevent the locking pin 84 from being overly retracted into the T-shaped groove. The width of the limiting groove 842 is greater than the thickness of the opening edge of the T-shaped groove. This can leave enough space for the locking pin 84 to swing relative to the operating handle 85 to prevent interference and jamming between the two. A guiding hole 831 is provided on the armrest 83. The diameters of the openings at both ends of the guiding hole 831 are smaller than the inner diameter of the middle hole therein. The locking pin 84 slidably passes through the guiding hole 831. A limiting flange 843 with a diameter larger than the opening of the guiding hole 831 and smaller than the middle hole is provided on the outer side of the locking pin 84, and the limiting flange 843 is arranged in the middle hole of the guiding hole 831. The armrest mechanism 8 further includes an elastic resetting member 86, and the elastic resetting member 86 is arranged between the locking pin 84 and the armrest 83. Specifically, the elastic resetting member 86 is a compression spring, the compression spring is built in the guiding hole 831, and one end thereof abuts against the limiting flange 843 and the other end abuts against the wall surface of the guiding hole 831 to provide an elastic force for inserting the locking pin 84 into the jack 811.
[0028] Please refer to Figures 5 to 7 , in summary, the working principle of the folding wheelchair 100 of the present invention will be described in detail below as follows:
[0029] When the armrest 83 needs to be unfolded and unlocked, manually rotate the operating handle 85 so that the operating handle 85 flips upward from the lower direction to the outside of the armrest 83. At this time, the operating handle 85 drives the locking pin 84 to slide, and the front end of the locking pin 84 leaves the jack 811 of the first link 81. At the same time, the locking pin 84 compresses the elastic reset member 86. At this time, the locking pin 84 unlocks the first link 81, and the first link 81 can rotate relative to the armrest 83. At this time, only by driving any one of the armrest 83, the first link 81 or the second link 82, the armrest 83, the first link 81 and the second link 82 can be deformed. The armrest 83, the first link 81 and the second link 82 can be folded towards the rear bracket 2. When the armrest 83 needs to be unfolded, only need to drive the armrest 83, the first link 81 and the second link 82 to deform in the opposite direction, so that the armrest 83, the first link 81 and the second link 82 are unfolded away from the rear bracket 2. Finally, the locking pin 84 is inserted back into the jack 811 under the elastic force of the elastic reset member 86 and locks the first link 81. At this time, the armrest 83, the first link 81 and the second link 82 are in a fixed unfolded state.
[0030] Compared with the prior art, the present utility model sets the operating handle 85 on the armrest 83, and the operating handle 85 is arranged on one side of the armrest 83 to be turned up and down. The locking pin 84 is connected to the operating handle 85. Therefore, when the operating handle 85 flips, the locking pin 84 can be driven to insert into or disengage from the armrest folding bracket 8a, so as to lock or unlock the armrest folding bracket 8a. The structure of the entire armrest mechanism 100 is very simple, and only by operating the operating handle 85, the armrest 83 can be folded or opened, which is very convenient to use.
[0031] The above-disclosed are only the preferred examples of the present utility model. Of course, the scope of rights of the present utility model cannot be limited by this. Therefore, the equivalent changes made according to the scope of the patent application of the present utility model still fall within the scope covered by the present utility model.
Claims
1. An armrest mechanism, characterized in that: The utility model comprises an armrest folding bracket, an armrest, a locking pin and an operating handle, wherein the armrest folding bracket is connected to the armrest, the locking pin is movably arranged between the armrest and the armrest folding bracket, the locking pin is connected to the operating handle, and the operating handle is arranged on one side of the armrest in an upside-down flipping manner to drive the locking pin to insert into or leave the armrest folding bracket, thereby locking or releasing the armrest folding bracket.
2. The armrest mechanism according to claim 1, characterized in that: The armrest folding bracket includes a first connecting rod and a second connecting rod, the lower end of the first connecting rod is pivotally connected to the frame of the folding wheelchair, the upper end of the first connecting rod is pivotally connected to the armrest, the lower end of the second connecting rod is pivotally connected to the frame of the folding wheelchair, and the upper end of the second connecting rod is pivotally connected to the armrest, and a deformable quadrilateral structure is formed among the first connecting rod, the second connecting rod, the armrest and the frame of the folding wheelchair.
3. The armrest mechanism according to claim 1, characterized in that: The armrest folding bracket is provided with an insertion hole, and the locking pin can be movably arranged on the armrest and the insertion hole to lock or release the armrest folding bracket.
4. The armrest mechanism according to claim 3, characterized in that: The pivot axis of the operating handle extends in the front and rear directions of the armrest, a sliding groove is provided on one side of the operating handle, the sliding groove extends in the upper and lower directions of the armrest, and one end of the locking pin is slidably arranged in the sliding groove.
5. The armrest mechanism according to claim 4, characterized in that: The sliding groove is a T-shaped groove, and the end of the locking pin is a T-shaped head matched with the T-shaped groove.
6. The armrest mechanism according to claim 5, characterized in that: The depth of the T-slot is greater than the thickness of the T-head.
7. The armrest mechanism according to claim 5, characterized in that: A limiting groove is circumferentially arranged on the outer side of one end of the locking pin close to the T-shaped head, and an opening edge of the T-shaped groove is clamped in the limiting groove.
8. The armrest mechanism according to claim 7, characterized in that: The width of the limiting groove is greater than the thickness of the opening edge of the T-shaped groove.
9. The armrest mechanism according to claim 1, characterized in that: The handrail is provided with a guide hole, the diameter of the openings at both ends of the guide hole is smaller than the inner diameter of the middle hole, the locking pin slides through the guide hole, and the outer side of the locking pin is provided with a limiting flange with a diameter larger than the guide hole opening and smaller than the middle hole, and the limiting flange is arranged in the middle hole of the guide hole.
10. The armrest mechanism according to claim 1, characterized in that: The armrest mechanism further comprises an elastic reset member, and the elastic reset member is arranged between the locking pin and the armrest.
11. A folding wheelchair, characterized in that: It comprises a vehicle frame and the armrest mechanism according to claim 1, wherein an armrest folding bracket of the armrest mechanism is arranged on the vehicle frame.