Adjustable Chair Back Tensioning for Pelvic Alignment
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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, combined with a seat back width and depth adjustment assembly and a seat bottom adjustment assembly to redistribute pressure and improve pelvic 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
Solution Approach 1:
The support system is divided into multiple independent adjustment assemblies: a seat back adjustment assembly with first and second tensioning members, and a seat bottom adjustment assembly with a third tensioning member. Each assembly can be independently adjusted to provide customized support, resolving the contradiction between adaptability and complexity by breaking down the complex adjustment function into manageable segments.
Solution Approach 2:
The system employs dynamic tensioning members that can be adjusted while the user is seated. The tensioning members include adjustment mechanisms that allow real-time modification of support characteristics, enabling the system to adapt to changing user needs and preferences without requiring complete reconfiguration or leaving the seat.
2Ease of operation
If conventional fixed support systems are used, then the device complexity is low, but the user comfort and pressure distribution are poor
Solution Approach 1:
The tensioning members are designed to be easily adjustable by the user themselves without requiring assistance or complex tools. Each tensioning member includes an adjustment mechanism that can be operated directly by the user to modify support characteristics, improving ease of operation and comfort while avoiding excessive complexity through intuitive self-adjustment design.
3Reliability
If adjustable tension members are added to improve support, then the comfort and alignment improve, but the device complexity increases
Solution Approach 1:
The system combines multiple support functions into an integrated assembly where the seat back adjustment assembly and seat bottom adjustment assembly work together through shared structural elements and coordinated tensioning members. This merging approach provides comprehensive support effectiveness while reducing overall complexity compared to having completely separate adjustment systems.
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 extending between the first and second seat back support members, the seat back tensioning assembly includes a carrier, an adjustable tension member coupled to the carrier, and a cable, wherein the cable extends between the first and second seat back support members a plurality of times, and wherein the adjustable tension member is configured to adjust a tension of the cable.