Bidirectional Exercise Resistance via Dual Pulley Cable System
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Solution Overview
Problem
Existing exercise equipment lacks a bidirectional resistance mechanism that provides consistent resistance throughout the range of motion in both clockwise and counterclockwise rotations, limiting the effectiveness of exercises that require bi-directional movements.
Innovation Solution
A bidirectional resistance apparatus featuring a cable system with rotatable pulleys and a weight stack, where one end of the cable is attached to a first pulley and the other to a second pulley, allowing the exercise arm to rotate both pulleys, providing constant resistance by wrapping and unwrapping the cable around the pulleys as the arm moves in either direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bidirectional resistance mechanism is implemented, then resistance consistency throughout range of motion is improved, but device complexity increases
Solution Approach 1:
The resistance mechanism is divided into two independent pulley systems (first pulley and second pulley) that can rotate independently in opposite directions. Each pulley is coupled to the cable system, allowing bidirectional resistance to be applied separately and consistently throughout the range of motion without requiring a complex unified mechanism.
Solution Approach 2:
A cable system acts as an intermediary element connecting the resistance source to both pulleys. The cable wraps around and unwraps from each pulley as they rotate, transferring resistance forces bidirectionally. This cable intermediary simplifies the overall mechanism by providing a common force transmission path for both rotational directions.
2Productivity
If constant resistance is provided in both directions, then exercise effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The resistance mechanism utilizes the natural geometric parameters of the cable wrapping and unwrapping process around the pulleys. As the pulleys rotate, the cable contact points and wrapping angles change automatically, providing constant resistance without requiring high manufacturing precision. The system leverages the rotational motion itself to maintain consistent resistance parameters throughout the range of motion.
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
Enables consistent resistance throughout the rotational motion, enhancing the effectiveness of exercises like hip flexions, extensions, abductions, and adductions by maintaining resistance after zero rotation in either direction, thus improving the workout experience.
Implementation Method 1
A bidirectional resistance apparatus for use with an exercise machine includes a cable, a first pulley rotatable about an axis, a first end of the cable attached to the first pulley at a first side of the bidirectional resistance apparatus, a second pulley rotatable about the axis, a second end of the cable attached to the second pulley at a second side of the bidirectional resistance apparatus
Implementation Method 2
a first pulley rotatable about an axis, a second pulley rotatable about the axis
Data Source
AI summary
Bidirectional resistance apparatus for exercise equipment are disclosed. An example exercise apparatus comprises a resistance source coupled to a cable between first and second ends of the cable, a rotational resistance mechanism coupled to the first and second ends of the cable, and an exercise arm coupled to the rotational resistance mechanism to rotate in first and second directions, the rotational resistance mechanism to apply a substantially constant resistance to the exercise arm when the exercise arm is rotated in the first and second directions.