Adjustable Wheelchair Backrest Using Pivoting and Sliding Components
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Solution Overview
Problem
Conventional wheelchairs with fixed leg rests and backrests cause discomfort and pain for users who must sit for extended periods due to inability to adjust the angles of these components, leading to back and leg pain.
Innovation Solution
An adjustable backrest system for wheelchairs, featuring pivoting and sliding components that allow users to adjust the angle of the backrest and leg rest independently, enabling different sitting positions to alleviate discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed backrest and fixed leg rest are used in a wheelchair, then the structure is simple and easy to manufacture, but the user experiences back and leg pain after sitting for a long time due to inability to adjust positions
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed backrest and leg rest into adjustable components. The backrest can pivot relative to the chair frame, and the leg rest can pivot relative to the chair frame, allowing users to change positions dynamically. This is achieved through pivoting components with engaging holes and engaging components that enable movement while maintaining structural integrity.
Solution Approach 2:
The patent segments the backrest and leg rest into independent adjustable components. The backrest assembly includes a backrest supporting component and a backrest sliding component that can move independently. Similarly, the leg rest is divided into a leg rest supporting component and a leg rest sliding component, each with independent pivoting and locking mechanisms, allowing separate adjustment of each element.
2Adaptability or versatility
If adjustable backrest and leg rest components are added to the wheelchair, then user comfort is improved, but the device complexity and number of parts increase
Solution Approach 1:
The patent implements universality by designing multi-functional components. The pivoting component serves multiple functions: it supports the backrest, enables pivoting movement, and provides positioning through engaging holes. The engaging component similarly provides both connection and locking functions. This reduces the need for separate dedicated parts for each function, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent applies nesting by placing the backrest sliding component inside the backrest shell, and the leg rest sliding component inside the leg rest shell. The pivoting components are nested within the respective assemblies, with engaging components fitting into corresponding receiving structures. This nested arrangement consolidates multiple functions into compact integrated units, minimizing the space and complexity increase.
Data Source
AI summary
An adjustable backrest is adapted for a chair frame and includes a first pivoting component, a second pivoting component, a backrest sliding assembly and a backrest connecting component. The second pivoting component is pivoted to the first pivoting component. The backrest sliding assembly is slidably disposed on the first pivoting component. The backrest connecting component is disposed between the first pivoting component and the second pivoting component. A first end of the backrest connecting component is pivoted to the backrest sliding assembly. A second end of the backrest connecting component is pivoted to the second pivoting component. The backrest sliding assembly drives the second pivoting component to pivot relative to the first pivoting component by the backrest connecting component when the at least one backrest sliding assembly slides relative to the first pivoting component, so as to support a user's back portion at different angles.