Rotatable Cam Coupling for Variable Resistance Exercise Motion
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Solution Overview
Problem
Existing exercise apparatuses lack a mechanism to efficiently provide variable resistance and motion control, limiting the versatility and effectiveness of muscle training.
Innovation Solution
A rotatable cam mechanism with non-concentric curvatures and offset axis, coupled with cables and pulleys, allows for consistent force transmission and adjustable resistance throughout the range of motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed resistance mechanism is used in exercise apparatus, then the structure is simple, but the versatility and effectiveness of muscle training is limited
Solution Approach 1:
The patent applies the dynamics principle by implementing a rotatable cam mechanism that transforms fixed resistance into variable resistance. The cam rotates about an offset axis, dynamically changing the resistance profile throughout the range of motion. This allows a single apparatus to provide multiple resistance patterns (increasing, decreasing, constant) for different muscle groups, thereby achieving versatility without proportionally increasing device complexity.
Solution Approach 2:
The patent employs parameter changes by modifying the resistance parameter through cam rotation. The cam's non-concentric curvature and offset axis create varying radial distances from the rotation axis, which directly changes the resistance force applied to the cable system. This enables the same mechanical structure to deliver different resistance levels and patterns, enhancing training effectiveness while maintaining structural efficiency.
2Adaptability or versatility
If variable resistance is provided through multiple resistance sources, then the effectiveness of training is improved, but the device complexity and number of components increases
Solution Approach 1:
The patent applies universality by designing a single cam mechanism that performs multiple functions: it provides variable resistance, controls motion trajectory, and adapts to different exercise types. The rotatable cam with its offset axis and non-concentric curvature can generate various resistance patterns (increasing, decreasing, constant) without requiring separate resistance sources, thereby achieving multi-functionality with a unified structure.
Solution Approach 2:
The dynamic rotation of the cam about an offset axis enables a single component to deliver multiple resistance profiles. By rotating the cam to different positions, the system dynamically adjusts the resistance characteristic, allowing one resistance source to replace what would traditionally require multiple fixed resistance sources, thus reducing overall device complexity.
3Force
If the cam rotates about a concentric axis, then the structure is symmetric and simple, but the force transmission consistency and motion control are reduced
Solution Approach 1:
The patent applies asymmetry by positioning the cam's rotation axis offset from the center of its curvature. This asymmetric configuration creates a non-uniform radial distance between the rotation axis and the cable contact point throughout the rotation cycle. The resulting asymmetric geometry enables consistent force transmission and precise motion control by maintaining optimal cable tension and alignment, which would not be achievable with a symmetric concentric axis configuration.
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 variable resistance and motion control, enhancing the effectiveness of muscle training by maintaining consistent force exertion and allowing for a variety of exercises with a single piece of equipment.
Implementation Method 1
a cam rotatably coupled to the clevis about an axis, the cam including: a curved outside surface having a first channel; and a curved inside surface having a second channel and a third channel
Implementation Method 2
a first cable, wherein one end of the first cable is coupled to one or more resistance engagements and another end of the cable is connected to the cam; and a second cable and a third cable coupled to the housing on one end and the cam on another end
Implementation Method 3
a pulley assembly coupling the first cable to the one or more resistance engagements
Data Source
AI summary
A coupling mechanism for an exercise apparatus is disclosed. The coupling mechanism may include a resistance source coupled with a housing, a rod coupled to the resistance source, a clevis coupled to the rod, and a cam rotatably coupled to the clevis about an axis. The cam may include a curved outside surface with a first channel, and a curved inside surface with a second and third channel. The coupling mechanism may also include a cable key coupled to the cam and several cables.