A universal wheelchair armrest assembly structure
By designing the positioning fit between the plug-in boss and the fitting groove and the bolt connection, combined with nylon composite materials, the problems of universality and stability of wheelchair armrest components were solved, realizing the left and right universal adaptation of the armrest components, reducing production and management costs, and improving disassembly and assembly efficiency and usage safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIAXING SMALL ELEPHANT MEDICAL TECH CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-17
Smart Images
Figure CN224505769U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wheelchair technology, specifically a universal wheelchair armrest assembly structure. Background Technology
[0002] In the design and manufacturing of traditional wheelchairs, the assembly structure of the armrest components has many limitations. Usually, the left and right armrests are independent and cannot be used interchangeably. That is, the left armrest can only be used with a specific left support rod, and the same applies to the right armrest. This not only limits the versatility of parts in the production stage, leading to increased mold development costs, but also causes many inconveniences in inventory management.
[0003] Furthermore, the existing armrest assembly process is complex and the connection stability is poor. Once disassembly, repair, or replacement of parts is required, the operation is extremely cumbersome, time-consuming, and labor-intensive. With the continuous advancement of wheelchair manufacturing technology, the industry has gradually realized the importance of improving the versatility of parts and optimizing assembly connection methods. On the one hand, highly versatile parts help simplify supply chain management, reduce production costs, and improve production efficiency. On the other hand, easy-to-disassemble and stable assembly structures are in line with the humanized and convenient design concept of modern wheelchairs, meeting users' needs for comfortable, safe, and practical products. Summary of the Invention
[0004] To solve the above-mentioned technical problems, this utility model relates to a universal wheelchair armrest assembly structure. This structure is simple and reliable, effectively solves the above-mentioned technical problems, and is suitable for widespread use. To achieve the above objectives, this utility model is implemented through the following technical solution: A universal wheelchair armrest assembly structure includes a support rod and an armrest assembly. The first end of the support rod is connected to the frame via a connecting assembly. The armrest assembly includes an upper shell and a lower shell, which are integrally connected. The upper shell has an integrally formed arc-shaped transition section and a horizontal support section. The end of the arc-shaped transition section extends to form a triangular reinforcing base. The end face of the reinforcing base is provided with a rectangular insertion boss. The second end of the support rod is provided with a locking block. The locking block has a fitting groove adapted to the shape of the insertion boss. The locking block has two sets of first bolt mounting holes perpendicular to the insertion direction. The insertion boss has threaded connection holes corresponding to the first bolt mounting holes. During assembly, the insertion boss is inserted into the fitting groove of the locking block for positioning, and a detachable connection is achieved using bolts perpendicular to the insertion direction.
[0005] Based on the above scheme and as a preferred embodiment of the above scheme: the front end of the horizontal support segment forms an arc transition angle, and the two edges of the arc transition angle are smoothly connected to the horizontal support segment.
[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the surface of the upper shell is provided with a plurality of second bolt mounting holes, and the lower shell is provided with a vertically protruding support column corresponding to the position of each second bolt mounting hole. The support column is provided with a threaded hole coaxial with the second bolt mounting hole. The bolt passes through the second bolt mounting hole and is screwed into the threaded hole to fix the upper shell and the lower shell.
[0007] Based on the above scheme and as a preferred embodiment of the above scheme: a reinforcing plate is provided between the multiple support columns of the lower shell, and the reinforcing plate is located between the left and right adjacent support columns and between the front and rear adjacent support columns, forming a grid-like reinforcement structure.
[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the upper and lower shell parts of the handrail assembly are integrally injection molded from nylon composite material, and glass fiber reinforcement is incorporated into the nylon composite material.
[0009] The outstanding and beneficial technical effects of this utility model compared with the prior art are as follows: This universal wheelchair armrest assembly structure has significant technical advantages. Its design realizes the left-right universality of the armrest components, and can be adapted to support rods on both the left and right sides for assembly and connection. This greatly improves the universality and interchangeability of parts, effectively reduces production costs and inventory management difficulties. In terms of assembly, the positioning and cooperation of the plug-in boss and the fitting groove are adopted, combined with the bolt connectors set perpendicular to the plug-in direction. This not only ensures a stable and reliable connection that can withstand various stresses during wheelchair use, but also achieves convenient disassembly and assembly. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the handrail assembly structure; Figure 2 This is a schematic diagram of the support rod; Figure 3 This is a schematic diagram of the upper shell component; Figure 4 This is a schematic diagram of the lower shell component. Detailed Implementation
[0011] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. However, the specific implementation methods and embodiments described below are for illustrative purposes only and are not intended to limit the present invention.
[0012] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1The directions or positional relationships shown are for the purpose of describing this utility model only, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0013] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.
[0014] To solve the above technical problems, such as Figure 1-4 As shown, this utility model designs a universal wheelchair armrest assembly structure, including a support rod 1 and an armrest assembly. The first end of the support rod 1 is connected to the frame via a connecting assembly. The armrest assembly includes an upper shell 2 and a lower shell 3, which are integrally connected. The upper shell 2 has an integrally formed arc-shaped transition section 21 and a horizontal support section 22. The end of the arc-shaped transition section 21 extends to form a triangular reinforcing base 4. The end face of the reinforcing base 4 is provided with a rectangular insertion boss 5. The second end of the support rod 1 is provided with a locking block 6. The locking block 6 is provided with a fitting groove adapted to the shape of the insertion boss 5. The locking block 6 has two sets of first bolt mounting holes 7 perpendicular to the insertion direction. The insertion boss 5 is provided with threaded connection holes corresponding to the first bolt mounting holes 7. During assembly, the insertion boss 5 is inserted into the fitting groove of the locking block 6 for positioning, and a detachable connection is achieved using bolts perpendicular to the insertion direction. The left and right sides support... While the shape of the rod 1 differs, one set of armrest components is suitable for assembling the support rods 1 on both the left and right sides. Due to the symmetrical design of the armrest shell, the armrest component can be matched and connected to the support rod 1 on either side without distinguishing between left and right. This left-right versatility not only improves the universality and interchangeability of parts but also reduces production and management costs, increases production efficiency, and simplifies inventory management. The tight fit between the insertion boss 5 and the locking block 6 ensures the accuracy of the initial positioning. The armrest component is fixed with bolts perpendicular to the insertion direction, providing a stable and reliable connection. This connection method can effectively resist various stresses generated during daily use of the wheelchair, such as the user's leaning, body swaying, and vibrations generated when the wheelchair travels on bumpy roads, ensuring that the armrest remains stable during long-term use and providing reliable support and safety for the user. The bolt connection is easy to fix, greatly improving the efficiency of disassembly and assembly and reducing the difficulty of disassembly and assembly.
[0015] Based on the above embodiment, the front end of the horizontal support section 22 forms an arc transition angle 23. The two edges of the arc transition angle 23 are smoothly connected to the horizontal support section 22. The design of the arc transition angle 23 makes the front end of the handrail present a soft curve shape, avoiding the hand injury that sharp edges may cause to the user, significantly improving the comfort of the user's hand when leaning on the handrail, eliminating the safety hazards caused by sharp edges, and reducing the risk of injury to the user due to accidental collision during daily use.
[0016] Further improvements are made based on the above embodiments. The surface of the upper shell 2 is provided with a plurality of second bolt mounting holes 8. The lower shell 3 is provided with a vertically protruding support column 9 corresponding to each second bolt mounting hole 8. The support column 9 is provided with a threaded hole coaxial with the second bolt mounting hole 8. The bolt passes through the second bolt mounting hole 8 and is screwed into the threaded hole to fix the upper shell 2 and the lower shell 3. The tight fit between the multiple bolts and the threaded hole provides a firm connection between the upper shell 2 and the lower shell 3, ensuring that the handrail assembly will not loosen or deform due to vibration or external force during use. When a part of the handrail assembly (such as the upper shell 2 or the lower shell 3) is damaged and needs to be replaced, only the corresponding bolts need to be removed to easily separate the upper shell 2 and the lower shell 3, which is convenient for maintenance personnel to perform partial replacement and reduces maintenance costs and time.
[0017] Further improvements are made based on the above embodiments. A reinforcing plate 10 is provided between the multiple support columns 9 of the lower shell 3. The reinforcing plate 10 is located between the left and right adjacent support columns 9 and between the front and rear adjacent support columns 9, forming a grid-like reinforcing structure. This effectively improves the overall structural strength and rigidity of the lower shell 3. When subjected to the weight of the user or external impact, the grid-like reinforcing structure can evenly distribute the stress, avoid local deformation or damage caused by stress concentration, and enhance the handrail assembly's ability to withstand various loads.
[0018] Based on the above embodiments, the upper shell 2 and lower shell 3 of the handrail assembly are further improved by integral injection molding of nylon composite material. Glass fiber reinforcement is incorporated into the nylon composite material. The low density of the nylon composite material effectively reduces the weight of the handrail assembly. The addition of glass fiber reinforcement significantly enhances the strength and rigidity of the nylon composite material. The addition of glass fiber effectively improves the tensile strength, flexural strength, and other mechanical properties of the material, enabling the handrail assembly to have better resistance to deformation and load-bearing capacity when subjected to user weight, external impacts, and other loads, ensuring the handrail remains stable and reliable during long-term use.
[0019] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made by those skilled in the art based on the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.
Claims
1. A universal wheelchair armrest assembly structure comprising a support bar and an armrest assembly, the first end of the support bar being connected to a frame by a connecting assembly, characterised in that: The handrail assembly includes an upper shell and a lower shell, which are connected as a single unit. The upper shell has an integrally formed arc-shaped transition section and a horizontal support section. The end of the arc-shaped transition section extends to form a triangular reinforcing base. The end face of the reinforcing base is provided with a rectangular insertion boss. The second end of the support rod is provided with a locking block. The locking block is provided with a fitting groove adapted to the shape of the insertion boss. The locking block is provided with two sets of first bolt mounting holes perpendicular to the insertion direction. The insertion boss is provided with threaded connection holes corresponding to the first bolt mounting holes. During assembly, the insertion boss is inserted into the fitting groove of the locking block to complete the positioning, and a detachable connection is achieved by using bolts arranged perpendicular to the insertion direction.
2. The universal wheelchair armrest assembly of claim 1, wherein: The front end of the horizontal support section forms an arc transition angle, and the two edges of the arc transition angle are smoothly connected to the horizontal support section.
3. The universal wheelchair armrest assembly of claim 1, wherein: The upper shell has several second bolt mounting holes on its surface. The lower shell has a vertically protruding support column corresponding to each second bolt mounting hole. The support column has a threaded hole coaxial with the second bolt mounting hole. The bolt passes through the second bolt mounting hole and is screwed into the threaded hole to fix the upper shell and the lower shell.
4. The universal wheelchair armrest assembly of claim 1, wherein: The lower shell has reinforcing plates between its multiple support columns. The reinforcing plates are located between adjacent left and right support columns and between adjacent front and rear support columns, forming a grid-like reinforcement structure.