Collapsible Chair Back Support for Neutral Spine Alignment
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Solution Overview
Problem
Conventional collapsible chairs lack sufficient back support, leading to improper spine alignment and discomfort due to the 'C-sitting' position, which can cause long-term health issues.
Innovation Solution
A collapsible chair design featuring a collapsible back with arcuate support members and a back membrane that spans between them, providing a curved support matching the natural lumbar curve of the spine, and a seat tilted backward to prevent forward sliding and maintain neutral spine alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional collapsible chairs use a simple seat membrane design, then the chair is easy to manufacture and store, but the back support is insufficient causing improper spine alignment
Solution Approach 1:
The back support members are formed with a predetermined arcuate shape that matches the natural lumbar curve of the spine. This curvature provides ergonomic support that maintains proper spine alignment while the user sits, resolving the contradiction between simple manufacturing and reliable spine alignment by incorporating the curved geometry directly into the support member design.
Solution Approach 2:
The back support members are positioned at a specific distance apart and angled relative to the seat, with their arcuate portions extending toward the front of the seat at optimized angles. These parameter changes create the necessary geometric configuration to support the lumbar region while maintaining manufacturing simplicity through standardized component design.
2Reliability
If the seat is tilted backward to prevent forward sliding, then spine alignment is improved, but the chair structure becomes more complex
Solution Approach 1:
The backward tilt of the seat is integrated with the arcuate configuration of the back support members into a unified geometric system. The seat, back supports, and their interrelationships form a coordinated structure where the tilt angle and arcuate shape work together to provide spine alignment, reducing overall structural complexity through design integration rather than adding separate adjustment mechanisms.
3Ease of operation
If the back support members are positioned to match the lumbar curve, then comfort and health are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The back support structure is divided into multiple discrete members, each with a standardized arcuate profile. This segmentation allows each component to be manufactured independently with consistent precision, and the modular nature enables easier quality control and assembly, reducing the overall manufacturing precision burden while maintaining ergonomic effectiveness.
Data Source
AI summary
A collapsible chair includes a collapsible seat having a front portion and an opposing rear portion and a collapsible back. The collapsible back includes a first back support member and a second back support member. Each of the first back support member and the second back support member includes an arcuate portion extending toward the front portion of the collapsible seat. A back membrane is coupled to the back support members and spans a distance between the back support members.