Sliding Backrest Mechanism for Continuous Spinal Support
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Solution Overview
Problem
Conventional chairs lack automatic adjustment mechanisms, leading to inadequate spinal support as 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 that maintains spinal support and stabilization by sliding forward to remain flush against the user's back, allowing for a greater range of positions and adjustable tilt to match the user's desired posture, along with sliding armrests for enhanced comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backrest is fixed in position, then the chair structure is simple, but the user loses spinal support when sliding forward in the chair
Solution Approach 1:
The backrest is designed to slide forward and backward along the seat to dynamically adapt to the user's position. This dynamic adjustment mechanism ensures continuous spinal support while the user moves forward or backward in the chair, resolving the contradiction between fixed structure and reliable support.
Solution Approach 2:
The backrest automatically adjusts its position in response to user movement without requiring manual intervention. The sliding mechanism engages passively as the user shifts position, providing self-adjusting spinal support that maintains reliability without adding complex control systems.
2Adaptability or versatility
If the backrest is manually adjustable, then the user can set initial depth, but the chair cannot automatically adapt when the user slides forward
Solution Approach 1:
The backrest incorporates a self-adjusting sliding mechanism that automatically responds to user position changes. As the user slides forward or backward, the backrest autonomously moves to maintain proper spinal alignment, providing adaptability without requiring complex electronic sensors or actuators.
Solution Approach 2:
The sliding mechanism provides mechanical feedback between the user's body position and the backrest position. The design allows the backrest to sense and respond to user movement through direct mechanical coupling, enabling automatic adaptation while keeping the mechanism relatively simple.
3Ease of operation
If the backrest is positioned at the rear edge of the seat, then the chair structure is compact, but the user cannot sit very far forward while maintaining spinal contact
Solution Approach 1:
The backrest is designed to slide forward beyond the static rear edge position of the seat, extending the effective range of user positions. This dynamic positioning capability allows users to sit far forward while maintaining spinal contact, effectively increasing the usable seat depth without permanently extending the chair's physical length.
4Reliability
If the backrest tilts to match user posture, then spinal support is optimized, but the mechanism becomes more complex
Solution Approach 1:
The backrest incorporates a tilting mechanism that allows it to rotate and match the user's desired posture angle. This dynamic angular adjustment optimizes spinal support by conforming to individual user preferences and anatomical variations, while the mechanism remains integrated within the sliding backrest structure to minimize overall complexity.
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.