Sliding Backrest Chair Design for Continuous Spinal Support
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Solution Overview
Problem
Conventional chairs lack automatic adjustment mechanisms, leading to inadequate spinal support when users slide forward, resulting in cumulative postural stress and potential spinal injuries, especially for individuals with degenerative conditions.
Innovation Solution
A chair with an automatically adjusting sliding back portion and tilting mechanism that maintains spinal support and stabilization, allowing the backrest to slide forward and tilt to match the user's position, ensuring continuous spinal contact and reducing muscle fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backrest is fixed in position, then the chair structure is simple, but the spinal support is inadequate when users slide forward
Solution Approach 1:
The backrest is designed to slide dynamically along the seat to maintain contact with the user's back. The backrest assembly includes a backrest support that can move forward and backward relative to the seat, allowing it to adapt to user position changes while providing continuous spinal support.
Solution Approach 2:
The chair is divided into functional modules: a fixed seat, a movable backrest support, and a backrest panel. This segmentation allows the backrest support to independently slide forward to maintain spinal contact while the seat remains stable, resolving the contradiction between support reliability and structural simplicity.
2Adaptability or versatility
If the backrest is positioned at the rear edge of the seat, then the chair structure is simple, but the user cannot sit far forward with proper spinal contact
Solution Approach 1:
The backrest support is designed to slide dynamically along the seat to maintain contact with the user's back. The backrest assembly includes a backrest support that can move forward and backward relative to the seat, allowing it to adapt to user position changes while providing continuous spinal support.
3Ease of operation
If the backrest is tilted at an angle, then the chair is comfortable for reclining, but it fails to provide sufficient spinal contact when the user slides forward
Solution Approach 1:
The backrest support slides dynamically to maintain proper orientation and contact with the user's back as they move. This dynamic adjustment ensures the backrest remains effectively positioned against the spine while allowing the seat to accommodate various sitting positions and angles.
Solution Approach 2:
The separation of the backrest support (movable) from the seat (fixed) allows independent optimization: the backrest support maintains stable spinal contact through sliding motion while the seat can be designed for comfort and various recline angles.
Data Source
AI summary
A therapeutic back support device including a back support portion that automatically and repeatedly moves forward to maintain engagement with a user's back as the user moves forward with respect to a chair seat. The back support portion substantially resists backward motion and provides substantially continuous therapeutic support to the user's spine pending a release signal.