Adjustable Rotating Saddle for Rear-Entry Wheelchair Stability
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Solution Overview
Problem
Conventional wheelchairs pose challenges in user convenience and safety due to the rear side entry method, which requires users to move backwards and can be unstable, often necessitating assistance for stable seating.
Innovation Solution
A rear side entry type wheelchair that functions as both a walker for rehabilitation while standing and a seated mobility aid, featuring a driving device, seat device with adjustable height and rotatable saddles, a back support device with folding mechanism, and a handle device for user support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user enters the wheelchair from the front side and seats on a fixed-height saddle, then the boarding process is straightforward, but the user's joints are burdened and stability is poor
Solution Approach 1:
The saddle is designed with height adjustability and rotatability about a vertical shaft, allowing it to dynamically adapt to different user needs and boarding positions. This dynamic configuration enables the saddle to be positioned optimally for both front-side and rear-side entry, improving both convenience and stability.
Solution Approach 2:
The saddle's height and angular position are made variable through adjustment mechanisms. By changing these parameters, the system can accommodate different user conditions and boarding methods, resolving the contradiction between ease of boarding and seating stability.
2Device complexity
If the wheelchair is designed with a fixed saddle at knee joint height, then the structure is simple, but the user's upper and lower body joints are burdened
Solution Approach 1:
The saddle incorporates height adjustment and rotation capabilities, transforming it from a fixed static component to a dynamic adjustable one. This allows the saddle to adapt to different user anatomies and comfort requirements without significantly complicating the overall device structure.
3Ease of operation
If the user must enter from the rear side and seat on a low saddle, then the boarding process is simplified, but safety is compromised and convenience is reduced
Solution Approach 1:
The rotatable and height-adjustable saddle allows users to enter from the rear side and then adjust the saddle to a higher, safer position once seated. This dynamic adjustment resolves the safety issue while maintaining the simplified boarding process advantage.
4Adaptability or versatility
If the wheelchair functions only as a seated mobility aid, then the design is specialized, but it cannot provide rehabilitation treatment
Solution Approach 1:
The wheelchair is designed to serve multiple functions: as a seated mobility aid with adjustable saddle and as a rehabilitation device with walker functionality. The saddle's adjustability and the device's convertible nature enable it to fulfill both roles without requiring entirely separate designs.
Data Source
AI summary
A rear side entry type wheelchair includes a driving device comprising a pair of driving frames provided on left and right sides thereof and driving wheels provided in the driving frames, respectively, a seat device including a pair of horizontal frames coupled to the driving device and saddles configured to be rotated about a vertical shaft on surfaces of the horizontal frames, a back support device including a back support opening/closing interworker provided on a rear side of the seat device and a back support provided in the back support opening/closing interworker configured to be foldable so as to be opened and closed, and a handle device provided on a front side of the seat device.