Adjustable Cable Retractor With Constant-Force Resistance Modules
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Solution Overview
Problem
Existing cable retractor devices provide variable resistance that is inefficient for muscle strengthening, especially when muscles are fully extended, and lack adjustable resistance levels to accommodate users of varying sizes and strength.
Innovation Solution
A cable retractor device with adjustable resistance modules that provide constant-force resistance at each level, allowing easy adjustment through removable modules and a resistance selector, enabling incremental resistance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If variable resistance is provided through elastic band or traditional spring, then the resistance increases as the range of motion increases, but the exercise efficiency decreases because maximum resistance occurs when the muscle is at its weakest state
Solution Approach 1:
The patent employs a cam mechanism that dynamically adjusts the resistance profile throughout the range of motion. The cam's specially designed surface profile transforms rotational motion into linear motion, creating a resistance curve that maintains optimal force levels regardless of muscle position, thereby resolving the contradiction between variable resistance and exercise efficiency
Solution Approach 2:
The invention changes the resistance parameter from a variable profile (increasing with range of motion) to a constant or optimized profile through the cam mechanism. This parameter transformation ensures that the resistance force remains appropriate for muscle strengthening throughout the entire exercise range, addressing the inefficiency of traditional variable resistance systems
2Device complexity
If a single non-adjustable resistance level is provided, then the device structure is simple, but the adaptability to different users decreases
Solution Approach 1:
The patent segments the resistance adjustment function into discrete, selectable levels that can be easily changed by the user. The cam mechanism includes multiple positioned elements that provide distinct resistance levels, allowing users to select appropriate resistance based on their individual needs without complicating the overall device structure
Solution Approach 2:
The system transitions from a static, single-resistance design to a dynamic, multi-level resistance system. The cam mechanism enables smooth transitions between different resistance levels while maintaining structural simplicity, thereby improving adaptability without proportionally increasing device complexity
3Adaptability or versatility
If adjustable resistance levels are provided through traditional mechanisms, then the adaptability to different users improves, but the ease of operation decreases due to cumbersome adjustment
Solution Approach 1:
The cam mechanism provides dynamic, smooth adjustment between resistance levels through rotational motion. This dynamic adjustment method is more intuitive and easier to operate than traditional mechanical systems, allowing users to quickly change resistance levels during exercise without cumbersome procedures
Solution Approach 2:
The invention replaces traditional complex mechanical adjustment systems with a cam-based mechanism that uses rotational motion to control resistance. This substitution simplifies the adjustment process, making it more user-friendly while maintaining adaptability to different user needs
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 consistent muscle engagement throughout the exercise range, accommodating diverse user needs by providing customizable resistance levels.
Implementation Method 1
Each resistance module contains a constant-force spring that is configured to resist the cord being pulled off of the cord spool
Data Source
AI summary
Apparatuses and methods for providing adjustable levels of resistances are disclosed. In some embodiments, the apparatus comprises a resistance module configured to provide a resistance. In some embodiments, the resistance module is configured to provide a constant-force resistance. In some embodiments, the apparatus comprises a continuously-variable gear for providing a continuously-variable resistance.