Constant Force Resistance Cable Retract
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Solution Overview
Problem
Existing cable retractor devices provide variable resistance, which can be inefficient as muscles are weakest when fully extended, and they often lack adjustable resistance levels to accommodate users of different sizes and strength levels, progressing or regressing over time.
Innovation Solution
A cable retractor device with multiple constant-force resistance modules that can be easily adjusted by coupling and decoupling, providing a consistent resistance level regardless of user orientation, allowing for customizable resistance levels through interchangeable modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If variable resistance is provided through elastic band or traditional spring, then the device can provide resistance throughout the range of motion, but the resistance increases as the range of motion increases which is inefficient when muscles are weakest at full extension
Solution Approach 1:
The patent changes the force characteristic parameter from variable (elastic band/spring) to constant throughout the range of motion. Constant-force springs maintain a substantially constant resistance level regardless of the angle or position, ensuring optimal exercise efficiency when muscles are weakest at full extension.
2Adaptability or versatility
If a single non-adjustable resistance level is provided, then the device structure is simple, but it cannot accommodate users of different sizes and strength levels or users progressing over time
Solution Approach 1:
The patent segments the resistance system into multiple independent resistance modules, each providing a different constant resistance level. Users can select and adjust between modules based on their strength level and progression needs, providing adaptability without requiring a complex adjustable mechanism within each module.
3Adaptability or versatility
If multiple resistance levels are provided with adjustable mechanism, then users can select appropriate resistance levels, but the adjustment mechanism becomes cumbersome
Solution Approach 1:
The patent implements a dynamic resistance selection system where multiple constant-force springs with different resistance levels can be selectively engaged or disengaged from the common cable. This allows users to easily switch between resistance levels by simply connecting or disconnecting modules, rather than adjusting a complex mechanism.
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
The device ensures efficient workouts by maintaining constant resistance throughout the range of motion, accommodating diverse user needs and progressions by allowing easy adjustment of resistance levels, enhancing exercise efficacy and user comfort.
Implementation Method 1
a first constant-force spring having the first resistance level, and a first end of the first constant-force spring is connected to the first drum
Data Source
AI summary
A device and method for exercising that includes a main axle, a cord spool attached to the main axle, a cord wrapped around the cord spool, resistance modules, and a resistance selector. The drum of each resistance module attaches to the main axle. The drum of each resistance module is attached to a spring configured to resist the cord being pulled from the cord spool. The drums of the resistance modules are configured with engagement patterns that allow for the drums of adjacent resistance modules to couple together. The resistance selector determines how many resistance modules are coupled together. The resistance level of the device can be adjusted to the desired resistance level by coupling together the desired number of resistance modules.