Wheelchair armrest fixing structure

Abstract

The utility model relates to a wheelchair armrest fixing structure which comprises an armrest, one end of the armrest is rotatably connected with the outer side of a seat installation position on a wheelchair side frame, a fixing column is arranged at the end of the armrest, and a limiting ring matched with the fixing column is arranged on the outer side of the seat installation position on the wheelchair side frame. The inner side of the limiting ring is provided with an inner ring which is coaxially arranged, the top of the inner ring is provided with an arc-shaped notch which is coaxially arranged, the side wall of the fixing column is provided with an outer convex part which is matched with the arc-shaped notch, and one end of the arc-shaped notch is provided with a first limiting surface which is close to the backrest mounting position and is arranged in the radial direction. The foldable armrest has the advantages that stable supporting performance is achieved, meanwhile, a user can fold the armrest only through two arms while keeping a sitting posture, the operation difficulty of overturning the armrest is greatly reduced, and the foldable armrest is more convenient to use and the like.

Description

Technical Field

[0001] This utility model pertains to a type of fixing structure, specifically relating to a wheelchair armrest fixing structure. Background Technology

[0002] As an important component of a wheelchair, the armrests are used to support the patient's elbows and prevent the patient from tipping over. To facilitate storage and allow the patient to enter and exit the wheelchair from the side, most existing wheelchair armrests can rotate relative to the wheelchair frame. For ease of control, mutually cooperating limiting components need to be installed on the wheelchair armrests and wheelchair frame to limit the rotation angle of the armrests.

[0003] Chinese patent application CN215652137U discloses a wheelchair armrest, including a fixed seat fitted onto the wheelchair backrest, a rotating seat rotatably connected to the fixed seat via a rotating shaft, and an armrest body inserted into the rotating seat. By setting a limiting post extending horizontally outward on the outer side of the fixed seat, the limiting post is located directly below the rotating shaft and spaced apart from the rotating shaft. A limiting groove matching the limiting post is opened on the inner side of the rotating seat, so that the limiting groove penetrates the end face of the rotating seat away from the armrest body.

[0004] When the armrests of the wheelchairs in the prior art are flipped, the user needs to flip the armrests on the right side with the left hand and the armrests on the left side with the right hand. It is difficult for the user to flip the armrests on the same side, which is very inconvenient. At the same time, it is difficult for the user to reach the armrests again after flipping, which is even more difficult to operate and greatly affects the user's comfort. Utility Model Content

[0005] The purpose of this utility model is to provide a wheelchair armrest fixing structure that solves the problems of inconvenience in use and high difficulty in operation of the existing technology.

[0006] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: a wheelchair armrest fixing structure, including an armrest, one end of which is rotatably connected to the outer side of the seat mounting position on the wheelchair side frame, a fixing post provided at the end of the armrest, a limiting ring cooperating with the fixing post provided on the outer side of the seat mounting position on the wheelchair side frame, an inner ring coaxially arranged on the inner side of the limiting ring, an arc-shaped notch coaxially arranged at the top of the inner ring, an outward protrusion cooperating with the arc-shaped notch on the side wall of the fixing post, and a first limiting surface radially arranged near the backrest mounting position at one end of the arc-shaped notch; the armrest one end is rotatably connected to the outer side of the seat mounting position on the wheelchair side frame. The rotating connection lowers the armrest's center of rotation, allowing users to easily access the armrest in both active and folded states without adjusting their body's center of gravity. The combination of the arc-shaped notch and the outward protrusion limits the armrest's rotation range, ensuring it can quickly rotate into position. The first limiting surface, located near the backrest mounting point and radially positioned, allows the armrest to be positioned on the outward protrusion in active mode, preventing it from rotating in the opposite direction. This provides stable support for the user's arms, and allows the user to fold the armrest while seated using only their arms, significantly reducing the difficulty of flipping the armrest and making it more convenient to use.

[0007] Preferably, the armrest includes a fixed section extending toward the backrest mounting position on the wheelchair side frame and bending upward, with the end of the fixed section extending toward the front of the seat mounting position on the wheelchair side frame to form a support section; the fixed section can provide stable support for the support section, and when the armrest is folded up, the center of gravity of the armrest is located at the connection between the fixed section and the support section, making the armrest folding up simpler and faster.

[0008] Preferably, the vertical distance between the end of the support section of the handrail and the vertical extension line of the handrail rotation center is twice the vertical distance between the connection point of the support section and the fixed section and the vertical extension line of the handrail rotation center. The above structure makes the center of gravity of the handrail biased towards the end of the support section, thereby keeping the handrail stable in use and preventing the handrail from easily flipping and folding over, which would affect the normal use of the user.

[0009] Preferably, one end of the arc-shaped notch is provided with a second limiting surface that is radially arranged and cooperates with the outward protrusion. Both sides of the outward protrusion are provided with mating surfaces that can contact the first limiting surface and the second limiting surface respectively. The above-mentioned second limiting surface and mating surface limit the outward protrusion when the armrest is folded, ensuring that the armrest can be quickly flipped into place when folded.

[0010] Preferably, the first limiting surface and the second limiting surface at both ends of the arc-shaped notch are respectively provided with a first connecting segment and a second connecting segment connecting the limiting ring and the inner ring, and an arc-shaped groove is formed between the first connecting segment and the second connecting segment; the above-mentioned first connecting segment and second connecting segment can cooperate with the first limiting surface and the second limiting surface to form an arch structure to enhance the structural strength, while the arc-shaped groove can enhance the structural strength, while reducing the amount of material used and reducing the weight of the component.

[0011] Preferably, a first washer is provided on the end plane of the handrail, and a second washer is sleeved on the fixed post, located between the fixed post and the inner ring and connected to the first washer. The second washer has an opening for the outward protrusion to pass through. The first washer can increase the friction between the end of the handrail and the side frame, further increasing the stability of the handrail in use and folded state. The second washer is provided to limit the fixed post and avoid direct contact between the inner ring and the fixed post, reducing wear. The opening is used to make way for the outward protrusion, and the second washer can be driven to rotate synchronously when the fixed post rotates, so as to reduce the wear of the fixed post.

[0012] Therefore, this utility model has the characteristics of stable support, and the user can fold the armrests by simply using both arms while maintaining a seated posture, which greatly reduces the difficulty of flipping the armrests and makes it more convenient to use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 yes Figure 1 A structural sectional view.

[0015] Figure 3 yes Figure 1 A schematic diagram of the structure of the side frame and the limiting ring.

[0016] Figure 4 yes Figure 1 A schematic diagram of the structure of the handrail and fixed column. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0018] like Figures 1-2As shown, a wheelchair armrest fixing structure includes an armrest 1. One end of the armrest 1 is rotatably connected to the outer side of the seat mounting position on the wheelchair side frame 2. The end of the armrest 1 is provided with a fixing post 11. The outer side of the seat mounting position on the wheelchair side frame 2 is provided with a limiting ring 21 that cooperates with the fixing post 11. The inner side of the limiting ring 21 is provided with a coaxially arranged inner ring 22. The top of the inner ring 22 is provided with a coaxially arranged arc-shaped notch 221. The side wall of the fixing post 11 is provided with an outward protrusion 111 that cooperates with the arc-shaped notch 221. One end of the arc-shaped notch 221 is provided with a first limiting surface 222 that is radially arranged near the backrest mounting position.

[0019] The fixing post at the end of the handrail is fixed in conjunction with the limiting ring. When the handrail is in use, the U-shaped structure opening of the handrail faces the front of the side frame. The fixing post drives the outward protrusion to rotate within the arc-shaped notch until the side wall of the outward protrusion abuts against the first limiting surface, thereby completing the flipping and use of the handrail. When the handrail needs to be folded, the fixing post drives the outward protrusion to rotate within the arc-shaped notch, causing the side wall of the outward protrusion to separate from the first limiting surface until the handrail naturally droops under its own weight.

[0020] like Figure 1 As shown, the armrest 1 includes a fixed section 12 extending towards the backrest mounting position on the wheelchair side frame 2 and curving upwards. The end of the fixed section 12 extends towards the front of the seat mounting position on the wheelchair side frame 2 to form a support section 13. The vertical distance between the end of the support section 13 and the vertical extension line of the armrest 1's rotation center is twice the vertical distance between the connection point of the support section 13 and the fixed section 12 and the vertical extension line of the armrest 1's rotation center. The armrest is formed by combining the fixed section and the support section, creating a one-piece U-shaped structure. When the armrest is in use, the U-shaped opening of the armrest faces the front of the wheelchair side frame. When the armrest is folded up, the U-shaped opening faces upwards and the armrest extends towards the front of the wheelchair side frame. This ensures that when the armrest supports the user's arms, the center of gravity is always biased forward, and the center of gravity of the user's arms is downward. When the user's arms are placed on the armrest, there is no need to exert force to maintain the armrest in use, making it easier to use. Furthermore, when the user is in a seated position, there is no need to exert force with the body; the armrest can be flipped up and folded up with slight force from the arms.

[0021] like Figures 2-3 As shown, one end of the arc-shaped notch 221 is provided with a second limiting surface 223 that is radially arranged and cooperates with the outer protrusion 111. Both sides of the outer protrusion 111 are provided with mating surfaces 112 that can contact the first limiting surface 222 and the second limiting surface 223 respectively. The first limiting surface 222 and the second limiting surface 223 at both ends of the arc-shaped notch 221 are respectively provided with a first connecting section 211 and a second connecting section 212 that connect the limiting ring 21 and the inner ring 22. An arc-shaped groove 213 is formed between the first connecting section 211 and the second connecting section 212.

[0022] A gap is formed between the inner ring and the inner wall of the limiting ring. The bottom surface of the arc-shaped notch of the inner ring can abut against the bottom surface of the outer protrusion. The first limiting surface of the arc-shaped notch corresponds to one of the mating surfaces of the outer protrusion, and the second limiting surface of the arc-shaped notch corresponds to the other mating surface of the outer protrusion. When the first limiting surface contacts the mating surface, the handrail is in use. When the second limiting surface contacts the mating surface, the handrail is in a folded state, which can maintain the stability of the handrail when folded and prevent the handrail from shaking when folded. The first connecting section and the second connecting section are connected to the inner ring and the limiting ring respectively to form an arc-shaped groove and an enclosed structure, which can reduce the weight of the components, reduce the amount of material used, and reduce material costs.

[0023] like Figure 1 and 4 As shown, a first gasket 141 is provided on the end plane of the handrail 1, and a second gasket 142 is sleeved on the fixing post 11, located between the fixing post 11 and the inner ring 22 and connected to the first gasket 141. The second gasket 142 is provided with an opening 143 for the outward protrusion 111 to pass through. The first gasket and the second gasket are made of plastic material and are integrally molded, which can increase the stability of the handrail after it is rotated into place. The first gasket is located between the edge of the fixing hole of the side frame and the end of the handrail. The second gasket is connected to the first gasket and bends and extends between the inner ring and the fixing post, abutting against the inner wall of the inner ring and the outer wall of the fixing post respectively.

[0024] The bottom of the fixed column is equipped with a connecting column that fits perfectly into the through hole at the bottom of the limiting component, with the end face of the connecting column located inside the through hole. A gap is formed between the end face of the connecting column and the inner edge of the bottom of the through hole. The pad is fixed in the groove on the other side of the side frame by screws, so that when the pad is fixed in the groove by screws, the end face of the connecting column does not contact the pad. This reduces the resistance caused by contact when the screws are tightened on the pad and the connecting column, ensuring the stability of the handrail after it is rotated into place. At the same time, anti-loosening glue is applied to the threaded connection between the screw and the connecting column to prevent the screw from loosening when the handrail is rotated frequently.

Claims

1. A wheelchair armrest securing structure characterized by: The application relates to a wheelchair armrest (1) which is rotatably connected to the outside of a wheelchair side frame (2) at a seat mounting position, wherein the armrest (1) is provided with a fixing column (11) at the end thereof, the outside of the seat mounting position of the wheelchair side frame (2) is provided with a limiting ring (21) matched with the fixing column (11), the inside of the limiting ring (21) is provided with an inner ring (22) coaxially arranged, the top of the inner ring (22) is provided with an arc-shaped notch (221) coaxially arranged, the side wall of the fixing column (11) is provided with an outer convex part (111) matched with the arc-shaped notch (221), and one end of the arc-shaped notch (221) is provided with a first limiting surface (222) arranged in the radial direction and close to a backrest mounting position.

2. The wheelchair armrest fixation structure according to claim 1, characterized in that: The armrest (1) comprises a fixing section (12) extending towards the backrest mounting position of the wheelchair side frame (2) and being bent upwards, and the end of the fixing section (12) extends towards the front side of the seat mounting position of the wheelchair side frame (2) to form a supporting section (13).

3. The wheelchair armrest fixation structure according to claim 2, characterized in that: The vertical distance between the end of the supporting section (13) of the armrest (1) and the vertical extension line of the rotation center of the armrest (1) is twice the vertical distance between the connecting point of the supporting section (13) and the fixing section (12) and the vertical extension line of the rotation center of the armrest (1).

4. The wheelchair armrest fixation structure according to claim 1, characterized by: One end of the arc-shaped notch (221) is provided with a second limiting surface (223) arranged in the radial direction and matched with the outer convex part (111), and the outer convex part (111) is provided with a matching surface (112) on both sides thereof which can be in contact with the first limiting surface (222) and the second limiting surface (223) respectively.

5. The wheelchair armrest fixation structure according to claim 4, characterized in that: The first limiting surface (222) and the second limiting surface (223) at the two ends of the arc-shaped notch (221) are respectively provided with a first connecting section (211) and a second connecting section (212) connected with the limiting ring (21) and the inner ring (22), and an arc-shaped groove (213) is formed between the first connecting section (211) and the second connecting section (212).

6. The wheelchair armrest securing structure according to claim 1, characterized by: The first gasket (141) is arranged on the end plane of the armrest (1), the second gasket (142) is arranged on the fixing column (11) and located between the fixing column (11) and the inner ring (22) and connected with the first gasket (141), and the second gasket (142) is provided with an opening (143) for the outer convex part (111) to pass through.

Images