Pilates Arm Chair Back Position Adjustment
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Solution Overview
Problem
Conventional Pilates arm chair exercise apparatuses offer limited adjustability in back positions, restricting user flexibility and effectiveness in performing various exercises.
Innovation Solution
A modified Pilates arm chair with a removable support block that allows the back to be adjusted between three positions: 90 degrees, 80 degrees, and a reclined position, using pivotally attached back support members and elongated resistance members with elastic springs for resistance during exercises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed back position is used in conventional Pilates arm chairs, then the structure is simple and stable, but user flexibility and exercise variety are limited
Solution Approach 1:
The back support members are made pivotally attached to the base rather than fixed, allowing the back to dynamically adjust between multiple positions (upright, reclined, and intermediate angles). This pivotal connection enables motion and adaptability while maintaining structural integrity through controlled rotation points.
Solution Approach 2:
The back support structure is divided into separate back support members that can independently pivot and adjust. Each back support member is a distinct component that can be positioned independently, allowing segmented adjustment of the backrest to achieve different angles and positions for varied exercises.
2Adaptability or versatility
If multiple back positions are added to increase exercise variety, then user flexibility improves, but the device complexity increases
Solution Approach 1:
The back support members are designed to be manually adjustable by the user without requiring complex motors or electronic controls. The user can easily pivot the back support members to desired positions and lock them in place, making the adjustment system self-service and eliminating the need for sophisticated automated mechanisms.
Solution Approach 2:
The system allows change in the angular parameter of the backrest by pivoting between fixed positions. The back support members can be positioned at different angles (upright, reclined, intermediate) by changing their rotational parameter around the pivotal connection points, providing exercise variety through parameter adjustment rather than complex mechanisms.
3Reliability
If elastic spring members are used for resistance, then exercise effectiveness improves, but the device complexity increases compared to fixed resistance
Solution Approach 1:
The elastic spring members provide variable resistance that changes with the position and compression of the springs. As the backrest angle and arm position change during exercises, the spring compression varies, automatically adjusting the resistance parameter to match the exercise phase, providing effective and adaptive resistance without complex control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances user flexibility and exercise variety by allowing multiple back positions, accommodating different workout preferences and reducing strain through adjustable resistance levels.
Implementation Method 1
elastic spring members fastened to a back extension positioned about 2 feet behind the top of the back of the chair
Data Source
AI summary
A chair arm exercise apparatus includes three distinct back positions with hand resistance members such as springs supported from a pair of supports spaced from the upper end of the back. The arm chair includes a base configured to rest on a horizontal floor surface, a seat, a pair of spaced apart trapezoidal shaped upright frame sides, a front upright end wall beneath and supporting a front end of the seat, a seat back pivotally supported from the frame sides behind the seat, and a seat cross member beneath the rear edge of the seat fastened to the frame sides. In a first position the back is at about 90 degrees to the seat. In a second position the back is about 80 degrees to the seat. In the third position the back is reclined.