Adjustable Seat Linkage for Spinal Mobilization and Back Support
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Solution Overview
Problem
Prolonged sitting leads to physical stress, including back, hip, and neck strain, as well as circulatory problems that can result in chronic inflammation and linked diseases such as heart disease, diabetes, Alzheimer's, and cancer, due to inadequate support and immobilization of joints.
Innovation Solution
A seat design featuring a base, a back-supporting surface, and a seating surface that are movable relative to each other, allowing the back-supporting surface to adjust in response to user force, with a mechanism enabling movement in various directions to change the angle between the seating and back-supporting surfaces, promoting spinal mobilization and improved circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the seating surface is fixed relative to the base, then the device complexity is reduced, but the ability to provide consistent back support and mobilize the spine during prolonged sitting is compromised
Solution Approach 1:
The back-supporting surface is made dynamically movable relative to the base through a linkage mechanism. The linkage includes a first link connected to the base, a second link connected to the first link and the back-supporting surface, enabling the back-supporting surface to move between multiple positions. This dynamic configuration allows the seat to adapt to different user needs and maintain spinal mobilization during prolonged sitting, resolving the contradiction between adaptability and complexity.
2Reliability
If the back-supporting surface is immobilized, then the device complexity is reduced, but circulatory problems and chronic inflammation risks increase due to joint immobilization
Solution Approach 1:
The back-supporting surface incorporates a movable linkage mechanism that enables controlled movement between positions. This dynamic capability promotes joint mobility and blood circulation during sitting, preventing the health issues associated with prolonged immobilization while maintaining a manageable device complexity through the use of mechanical linkages rather than complex active systems.
3Adaptability or versatility
If the seating surface moves toward and away from the back-supporting surface, then spinal mobilization is improved, but the stability of the seating position is reduced
Solution Approach 1:
The seating system employs a linkage mechanism with defined motion paths that enable controlled movement of the back-supporting surface relative to the seating surface. The linkage constrains the motion to specific trajectories, providing spinal mobilization benefits while maintaining predictable and stable seating positions during movement transitions.
Solution Approach 2:
The system changes the relative position parameters between the seating surface and back-supporting surface through controlled movement of the linkage mechanism. By adjusting the configuration of the links, the system can transition between different seating positions while maintaining stability at each position, enabling spinal mobilization without compromising overall seating stability.
Data Source
AI summary
Among other things, a seat includes a base; a back-supporting surface coupled to the base; and a seating surface movable relative to the base in a direction of motion toward and away from the back-supporting surface. The back-supporting surface has a lower portion nearer the seating surface that is movable, relative to an upper portion of the back-supporting surface that is farther from the seating surface, in the direction of motion as the seating surface moves in the direction of motion.