Reciprocating Exercise Chair Backrest for Trunk Swaying
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Solution Overview
Problem
Type A users who perform pedaling exercises while sitting on a chair with a fixed seat portion are unable to effectively sway their trunk to the right and left, thereby hindering their ability to perform a pedaling exercise efficiently.
Innovation Solution
An exercise chair is designed with a seating portion that allows the user to sit and a backrest that can reciprocate to the right and left and rotate in roll, enabling the user to perform lower extremity exercises while swaying their trunk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the seat portion is fixed, then the structure is simple and stable, but the user cannot effectively sway their trunk to activate the kinetic chain
Solution Approach 1:
The seat portion is designed with movable components including a seat pan that can tilt and rotate, allowing dynamic movement during exercise. The seat pan is connected to a seat base through a tilt mechanism and roll mechanism, enabling the seat to adapt its position during pedaling exercises and trunk swaying motions.
Solution Approach 2:
The seat portion is divided into multiple functional segments: a seat pan for user contact, a tilt mechanism for forward-backward movement, and a roll mechanism for side-to-side movement. Each segment can move independently to provide the necessary degrees of freedom for trunk swaying while maintaining structural integrity.
2Ease of operation
If the backrest is fixed, then the structure is simple, but it cannot follow the user's trunk movement during exercise
Solution Approach 1:
The backrest is designed with a support mechanism that allows it to move dynamically in response to user trunk movement. The backrest can tilt forward-backward and roll side-to-side through mechanical linkages connected to the seat portion, enabling it to follow the natural motion of the user's trunk during exercise.
Solution Approach 2:
The backrest support mechanism responds to user movement through mechanical feedback loops. As the user moves their trunk, the backrest automatically adjusts its position through the tilt and roll mechanisms, providing continuous adaptation without requiring external control systems.
3Productivity
If the kinetic chain is activated through trunk swaying, then exercise effectiveness is improved, but the chair structure becomes complex
Solution Approach 1:
The tilt mechanism and roll mechanism are integrated into a unified seat support structure that works together to provide both forward-backward and side-to-side movements. The backrest support mechanism is merged with the seat mechanisms to provide coordinated movement across all three degrees of freedom, reducing the need for separate independent mechanisms.
Data Source
AI summary
An exercise chair allows a user to perform a lower extremity exercise in a sitting position. The exercise chair includes: a seating portion configured to allow the user to sit on; a backrest configured to support the back of the user; and a support mechanism configured to support the backrest. The support mechanism is configured to support the backrest so as to allow the backrest to reciprocate to right and left and to rotate in roll.