Wheelchair Leg Rest with Pivot Mechanism for Adjustable Angle Support
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Solution Overview
Problem
Conventional wheelchairs lack an adjustable leg rest, failing to provide support for various leg positions where the legs are bent at different angles, which is a limitation for individuals with impaired mobility.
Innovation Solution
A chair design featuring a pivotally mounted leg rest with a rest adjusting mechanism that can be converted between unlocked and locked states, allowing the leg rest to adjust to multiple predetermined angles, and a canopy frame with an adjustable canopy mechanism for customizable support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the leg rest is fixed to the seat frame, then the structure is simple and stable, but the chair cannot support various leg positions with different bending angles
Solution Approach 1:
The leg rest is made dynamically adjustable through a pivot connection between the leg rest and seat frame, allowing the leg rest to rotate relative to the seat frame. This enables the chair to adapt to different leg positions while maintaining structural simplicity through the use of a single rotational degree of freedom
Solution Approach 2:
The angle between the leg rest and seat frame is changed as a variable parameter. By allowing this angle to be adjusted within a certain range, the chair can support various leg bending angles. The rest adjusting mechanism enables continuous or discrete changes in this angular parameter
2Adaptability or versatility
If the leg rest is made movable to adjust angles, then support for various leg positions is achieved, but the structure becomes more complex
Solution Approach 1:
The leg rest adjusting mechanism uses a simple pivot connection that allows rotational movement. This dynamic joint enables angle adjustment without requiring complex mechanisms such as gears, cames, or hydraulic systems, thus achieving adaptability while minimizing structural complexity
Solution Approach 2:
The leg rest system is segmented into two main parts: the leg rest itself and the seat frame, connected by a pivot joint. This segmentation allows independent movement of the leg rest relative to the seat frame, enabling angle adjustment while keeping each component structurally simple
Data Source
AI summary
A chair includes a frame unit including a seat frame, a leg rest that is pivotally mounted to the seat frame, and a rest adjusting mechanism that is connected between the leg rest and the seat frame. The rest adjusting mechanism is convertible between an unlocked state, where the leg rest is permitted to pivot relative to the seat frame, and a locked state, where the leg rest is not permitted to pivot relative to the seat frame.