Circumferential rotation adjustment device for a chair armrest
By introducing a shaft core device and a circumferential rotation stop device into the wheelchair armrest, the circumferential rotation adjustment of the armrest is realized, solving the problem that existing wheelchair armrests cannot rotate, and providing flexible positions for placing or supporting the hand to meet the needs of different users.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENFENG (GUANGDONG) INTELLIGENT TECH CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-06-12
AI Technical Summary
Existing wheelchair armrests lack circumferential rotation adjustment, failing to meet the needs of different users, especially those with hand injuries or those unable to straighten their arms.
A circumferential rotation adjustment device for chair armrests was designed. By setting a core device between the armrest vertical bar and the hand support long component, the hand support long component is allowed to rotate circumferentially relative to the armrest vertical bar, achieving an angle adjustment of 0-360 degrees. The core device and the circumferential rotation stop device are used for positioning and fixing.
It enables flexible rotation and adjustment of the armrests to adapt to the needs of different users, providing a comfortable position for placing or supporting the hand. It is especially suitable for users with hand injuries or who cannot straighten their hands. The structure is simple, easy to assemble, and low in cost.
Smart Images
Figure CN224345103U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to wheelchair components, and more particularly to a circumferential rotation adjustment device for chair armrests. Background Technology
[0002] 1. Chinese Patent Document Publication No. CN110711084A discloses an armrest lifting device and a wheelchair, relating to the field of wheelchair technology. The armrest lifting device is used to control the flipping of the armrests on both sides of the seat. One end of the first rocker arm is hinged to the seat, and the other end is hinged to the bottom of the armrest. A fixing member is fixed to the seat. One end of the second rocker arm is hinged to the fixing member, and the other end is hinged to the bottom of the armrest. The drive assembly is configured to drive the first rocker arm to rotate around the hinge point with the seat and drive the second rocker arm to rotate in the same direction around the hinge point with the fixing member. The first rocker arm and the second rocker arm are configured to jointly flip the armrest outward to a horizontal state when rotating towards the seat, and jointly flip the armrest inward to a vertical state when rotating away from the seat.
[0003] 2. Chinese Patent Document Publication No. CN205683211U discloses a wheelchair armrest folding mechanism, including a wheelchair backrest and armrests. The backrest includes a left backrest support column and a right backrest support column. The armrests include a left armrest and a right armrest. The left armrest is hinged to the left backrest support column and can be flipped upwards. The right armrest is hinged to the right backrest support column and can be flipped upwards. A left armrest support arm is fixed to the lower side of the left armrest, and a right armrest support arm is fixed to the lower side of the right armrest. The left armrest support arm extends towards the left backrest support column and is engaged and fixed to it. The right armrest support arm extends towards the right backrest support column and is engaged and fixed to it. Flipping the left armrest upwards allows the left armrest support arm to disengage from the left backrest support column, and flipping the right armrest upwards allows the right armrest support arm to disengage from the right backrest support column.
[0004] 3. Chinese Patent Document Publication No. CN204246358U discloses a novel wheelchair armrest flipping mechanism. The mechanism includes screws, aluminum tube caps, washers, armrest assemblies, limit rings, inner steering limiters, and a rotating shaft. The armrest assembly is welded to the middle of the rotating shaft, and an inner steering limiter is set in the middle of the rotating shaft. A limit ring is set on the outer side of the rotating shaft. The rotating shaft is connected to the wheelchair frame by screws, and an aluminum tube cap and a washer are set between the screws and the rotating shaft. This utility model can effectively prevent the armrest from pinching the user during the flipping process by setting a limit ring on the outer side of the rotating shaft and an inner steering limiter. At the same time, the armrest assembly is connected to the wheelchair frame through the rotating shaft, and the wheelchair armrest assembly can be flipped as needed. The flipping mechanism has a simple and sturdy structure and has a very good effect.
[0005] The three examples above show that wheelchair armrests have height adjustment structures, folding structures, and flipping mechanisms, which are commonly used. However, they lack circumferential rotation adjustment, cannot bend to place / support the hand, and are not suitable for use when the hand is injured. Utility Model Content
[0006] To solve the above-mentioned technical problems, this utility model provides a chair armrest with a reasonable structural design that facilitates the adjustment of the circumferential rotation angle of the long hand support component, thus making it convenient to adjust the circumferential rotation of the armrest.
[0007] The solution to the above technical problem is as follows:
[0008] A circumferential rotation adjustment device for a chair armrest includes an armrest vertical rod and a hand support long component. The hand support long component is arranged axially in a front-to-back manner or in a horizontal manner. A shaft core device is provided between the top of the armrest vertical rod and the hand support long component. The hand support long component can be circumferentially rotated to adjust its angle based on the shaft core device.
[0009] The advantages of this utility model's circumferential rotation adjustment device for chair armrests are as follows: This product allows users to adjust the angle of their hand rest / support by rotating the long armrest component clockwise or counterclockwise as needed, making it convenient for them to bend inwards or outwards to rest / support their hands, resulting in a more comfortable experience. It is also more suitable for those with hand injuries or those who cannot straighten their hands. The above-mentioned structural design is reasonable, and the circumferential rotation angle can be adjusted according to the user's height and build to suit their needs, making it convenient to use overall. Attached Figure Description
[0010] Figure 1 This is a perspective view of the product of this utility model;
[0011] Figures 2 to 4 This is a perspective view of the hand support long component of this utility model after clockwise circumferential rotation adjustment;
[0012] Figure 5 This is a perspective view of the long hand support component of this utility model after counterclockwise circumferential rotation adjustment;
[0013] Figure 6 This is a perspective view of the product of this utility model;
[0014] Figure 7 , Figure 8 This is a perspective view of the hand support long component of this utility model after clockwise circumferential rotation adjustment;
[0015] Figure 9 This is a perspective view of the long hand support component of this utility model after counterclockwise circumferential rotation adjustment;
[0016] Figures 10 to 13 This is an exploded view of the product of this utility model.
[0017] 1. Handrail vertical bar; 2. Hand support long component; 21. Bottom long shell component; 22. Top cover shell component; 23. Hand support pad; 231. Embedded cavity; 201. Hole; 202. Shaft core through hole; 3. Shaft core device; 31. Shaft top component; 311. Bead hole; 32. Shaft core vertical component; 4. Circumferential rotation stop device; 41. Circular stop concave hole; 42. Ball bearing. Detailed Implementation
[0018] like Figures 1 to 13 The following describes a circumferential rotation adjustment device for a chair armrest, comprising an armrest vertical rod 1 and a hand support elongated component 2. The armrest vertical rod 1 is located at the bottom of the hand support elongated component 2 and can be designed into a T-shape or a figure-7 shape, etc. The armrest vertical rod 1 is a hollow structure made of plastic or metal. The bottom of the armrest vertical rod 1 is connected to the wheelchair side frame. The hand support elongated component 2 is arranged in a reclining manner, including flat reclining, diagonal reclining, horizontal, horizontal placement, and basically horizontal placement, etc., utilizing the relatively flat top to support the hand. The hand support elongated component 2 is used to place the hand on top. Under normal conditions, the hand support elongated component 2 is arranged axially in a front-to-back manner, providing axial hand placement / support. When a person sits in the wheelchair, the armrest extends in the same direction as their arm. A pivot device 3 is installed between the top of the armrest vertical bar 1 and the hand support long component 2. The hand support long component 2 can rotate circumferentially relative to the armrest vertical bar 1 based on the pivot device 3 to adjust the angle, thus meeting basic usage requirements. It can rotate clockwise or counterclockwise. By adjusting the angle of the hand support long component 2 clockwise or counterclockwise as needed, users can comfortably place or support their hands, making it easier to bend inward or outward to place or support them. This design is particularly suitable for people with hand injuries or those who cannot straighten their hands. The above structure is reasonably designed and the circumferential rotation angle can be adjusted according to the user's height and weight to suit their needs, making it convenient to use overall.
[0019] Further, in the preferred technical solution: the top section of the handrail vertical rod 1 supports the long hand support component 2, and the top section of the handrail vertical rod 1 and the bottom surface of the long hand support component 2 are in a movable contact connection. The top section of the handrail vertical rod 1 is mainly to increase the contact area, prevent the long hand support component 2 from tilting to the side, and make the support of the long hand support component 2 more balanced. The movable contact connection is to allow the long hand support component 2 to rotate circumferentially.
[0020] Further, in the preferred technical solution: the top of the handrail vertical bar 1 is connected to the inside of the hand support long component 2 by a shaft core device 3, which provides more physical connections, making the installation more secure and the rotation more stable.
[0021] Further, in the preferred technical solution: the hand support long component 2 has a cavity 201 inside, and a shaft core through hole 202 is opened at the bottom of the cavity 201. The top of the handrail vertical rod 1 is connected to the shaft core through hole 202 and the cavity 201 of the hand support long component 2 through a shaft core device 3. The shaft core device 3 is clamped between the handrail vertical rod 1 and the hand support long component 2, and the shaft core device 3 is hidden inside and not visible from the outside, which can prevent the hand from being pinched by rotation, and can also reduce the installation height.
[0022] Further, in the preferred technical solution: the shaft core device 3 includes a shaft top component 31 and a shaft core vertical component 32; the shaft top component 31 can be a single component or a fixed connection assembly of multiple parts; the shaft core vertical component 32 is a shaft core column, and the shaft top component 31 is fixedly connected to the top of the shaft core vertical component 32 by a screw assembly. The shaft top component 31 and the shaft core vertical component 32 can also be fixedly connected by interlocking or clamping. The bottom of the shaft core vertical component 32 is integrally fixedly connected to the top of the handrail vertical rod 1. The size of the shaft top component 31 is larger than the shaft core through hole 202 and is arranged in the cavity 201. In this way, the hand support long component 2 will not come out. The shaft core vertical component 32 passes through the shaft core through hole 202. This structure is easy to assemble, low in cost, and simple in structure.
[0023] A further preferred technical solution: A circumferential rotation stop device 4 is provided between the shaft top component 31 and the wall of the cavity 201, so that it can be positioned and fixed after the required angle is adjusted by rotation, and will not rotate naturally, thus preventing it from rotating with the slightest movement and improving ease of use.
[0024] Further, in the preferred technical solution: the circumferential rotating stop device 4 includes an annular stop recess 41 and ball bearings 42. The annular stop recess 41 forms a wave-shaped annular stop recess 41, which is composed of several stop recesses arranged in a ring. Generally, 10 to 20 stop recesses can be opened. Depending on the required number, one stop recess corresponds to one stop. The bottom wall of the cavity 201 is provided with an annular stop recess 41, and ball bearings 42 are clamped between the shaft top component 31 and the annular stop recess 41. The ball bearing 42 is relatively small. After the hand support component 2 is rotated circumferentially for adjustment, the ball bearing 42 falls into the corresponding annular stop recess 41 for positioning and fixation. When the hand support component 2 rotates, the annular stop recess 41 changes angle accordingly, and the ball bearing 42 rolls in the original position. With a little force, the hand support component 2 can be rotated to pass over / slide over the ball bearing 42, skipping a step. After adjusting the required angle, the ball bearing 42 falls into the corresponding annular stop recess 41 for positioning and fixation. The above structure is simple, easy to assemble, easy to slide, easy to position, and has low setup cost.
[0025] A further preferred technical solution: the bottom wall of the shaft top component 31 has a bead hole 311, and the ball 42 is partially embedded in the bead hole 311 and partially embedded in the annular stop recess 41. 60% of the ball 42 is embedded in the bead hole 311 and 40% is embedded in the annular stop recess 41; this better allows the ball 42 to roll in its original position and allows the annular stop recess 41 to rotate and change position as the long component 2 is supported, and to be well-positioned after rotation stops. The shaft top component 31 can be integrally formed or composed of multiple parts fixedly connected together.
[0026] Further, in the preferred technical solution: the hand support long component 2 includes a bottom long shell 21 and an upper cover shell 22. The top of the bottom long shell 21 has a cavity 201. The top of the bottom long shell 21 is fixedly connected to the upper cover shell 22 by screws, snap-fit, or interlocking. This facilitates the installation of the shaft core device 3 in the cavity 201.
[0027] The top of the hand support component 2 is fitted with a hand support pad 23, which is fixedly connected by a sleeve, screw, or inlay. The hand support pad 23 can be increased in area and designed in various styles, and can also be designed in a variety of ways according to ergonomics. The hand support pad 23 is made of cotton material, soft rubber, or foam material. The bottom of the hand support pad 23 has a cavity 231, in which the bottom elongated shell component 21 and the top cover shell component 22 are embedded and fixedly connected.
[0028] Further, in the preferred technical solution: the hand support long component 2, based on the shaft core device 3, can be circumferentially rotated and adjusted relative to the handrail vertical rod 1 within a range of 0 to 360 degrees, i.e., less than 360 degrees; it can be adjusted clockwise or counterclockwise; for example 1: the hand support long component 2, based on the shaft core device 3, can be circumferentially rotated and adjusted relative to the handrail vertical rod 1 within a range of 0 to 90 degrees; for example 2: the hand support long component 2, based on the shaft core device 3, can be circumferentially rotated and adjusted relative to the handrail vertical rod 1 within a range of 0 to 120 degrees; a suitable range of rotation adjustment angles is designed.
[0029] Further, in the preferred technical solution: the hand support long component 2, based on the shaft core device 3, can rotate 360 degrees circumferentially relative to the handrail vertical bar 1 to adjust the angle, and can be freely rotated 360 degrees; it can be adjusted clockwise or counterclockwise.
Claims
1. A circumferential rotation adjustment device for a chair armrest, comprising an armrest vertical rod and a hand support elongated component; the armrest vertical rod is disposed at the bottom of the hand support elongated component; the hand support elongated component is arranged in a reclining manner, characterized in that: A shaft core device is provided between the top of the handrail vertical bar and the long hand support component. The long hand support component can be rotated circumferentially relative to the handrail vertical bar to adjust the angle based on the shaft core device. A shaft core device is connected through the top of the handrail vertical bar and the interior of the hand support long component; The hand support long component has an internal cavity, and a shaft core through hole is opened at the bottom of the cavity. The top of the handrail vertical rod is connected to the shaft core through hole and the cavity of the hand support long component through a shaft core device. The shaft core device includes a shaft top component and a shaft core column. The shaft top component is fixedly connected to the top of the shaft core column, and the bottom of the shaft core column is fixedly connected to the top of the handrail vertical bar. The size of the shaft top component is larger than the shaft core through hole and is arranged in the cavity. The shaft core column passes through the shaft core through hole.
2. The circumferential rotation adjustment device for a chair armrest according to claim 1, characterized in that: The top section of the handrail vertical rod supports the long hand support component, and there is a movable contact connection between the top section of the handrail vertical rod and the bottom surface of the long hand support component.
3. A circumferential rotation adjustment device for a chair armrest according to claim 1 or 2, characterized in that: A circumferential rotation stop device is provided between the shaft top component and the cavity wall.
4. The circumferential rotation adjustment device for a chair armrest according to claim 3, characterized in that: The circumferential rotating stop device includes an annular stop recess and a ball bearing. The annular stop recess is composed of several stop recesses. The bottom wall of the cavity has an annular stop recess. A ball bearing is clamped between the shaft top component and the annular stop recess. After the hand support long component is circumferentially rotated and adjusted, the ball bearing falls into the corresponding annular stop recess for positioning and fixing.
5. The circumferential rotation adjustment device for a chair armrest according to claim 4, characterized in that: The bottom wall of the shaft top component has a bead hole, and the ball is partially embedded in the bead hole and partially embedded in the annular stop recess.
6. A circumferential rotation adjustment device for a chair armrest according to claim 1, 2, 4, or 5, characterized in that: The hand support component includes a bottom shell and a top cover shell. The top of the bottom shell has a cavity, and the top of the bottom shell is fixedly connected to the top of the top cover shell. A hand support pad is fixedly connected to the top of the hand support component.
7. A circumferential rotation adjustment device for a chair armrest according to claim 1, 2, 4, or 5, characterized in that: The hand support long component is based on a shaft core device and can be rotated and adjusted relative to the handrail vertical bar between 0 and 360 degrees or in a 360-degree circumferential direction.