Chair Back Tensioning Assembly for Pelvis Alignment Support
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Solution Overview
Problem
Conventional chair support systems fail to provide adequate adjustability and comfort, often leading to undesirable sitting positions that result in undue pressure on the tailbone due to insufficient support and poor pelvis alignment.
Innovation Solution
An adjustable chair support system featuring a seat back tensioning assembly with adjustable tension members, guide members, and a cable system that allows for customizable tension and positioning, coupled with a seat back width and depth adjustment assembly and a seat bottom adjustment assembly to redistribute pressure and improve pelvis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional chair support systems are used, then the structure is simple, but the adjustability and comfort are insufficient leading to poor pelvis alignment and tailbone pressure
Solution Approach 1:
The support system is divided into multiple independent adjustable components: a seat back support member with tensioning assembly, a seat bottom support member with positioning assembly, and individual adjustment mechanisms for each component. This segmentation allows independent adjustment of each element to achieve optimal positioning and comfort while maintaining reasonable complexity through modular design.
Solution Approach 2:
The system incorporates dynamic adjustment capabilities allowing users to modify the position, angle, and tension of support members while sitting. The tensioning assembly with cable and pulley mechanisms enables real-time adjustment of seat back tension, and the positioning assembly allows movement of the seat bottom support member along the seat back support member, providing adaptability without excessive complexity.
2Adaptability or versatility
If adjustable tension members and cable systems are added, then comfort and support are improved, but the weight of the system increases
Solution Approach 1:
The system uses flexible cable elements and thin structural members instead of heavy rigid components. The cable and pulley tensioning mechanism provides adjustable support with minimal weight, and the longitudinal member with channels allows flexible positioning without adding significant mass. This approach achieves customizable positioning while keeping the overall system weight low.
3Manufacturing precision
If multiple guide members and cable paths are implemented, then positioning precision is improved, but the device complexity increases
Solution Approach 1:
The system introduces guide members as intermediary elements that simplify the cable routing and tensioning process. The guide members provide defined paths for cables, ensuring precise positioning without requiring complex direct connections. The pulley acts as an intermediary mechanism that translates cable tension into controlled movement of support members, achieving positioning precision while managing assembly complexity through standardized components.
Data Source
AI summary
An adjustable chair support system includes a first seat back support member spaced from a second seat back support member, and a seat back tensioning assembly that extends between the first and second seat back support members. The seat back tensioning assembly includes a carrier coupled to the first seat back support member, the carrier including an adjustable tension member and a first guide member, a pair of second guide members coupled to the second seat back support member, and a cable extending from the adjustable tension member into engagement with one of the pair of second guide members, with the first guide member, with the other of the pair of second guide members, and then returning to the adjustable tension member.