Seated Calf Machine Foot Engagement Stability
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Solution Overview
Problem
Conventional seated calf exercise machines often lift the heel off the foot platform during exercise and do not accommodate exercisers of different foot sizes, leading to instability and discomfort.
Innovation Solution
A seated calf exercise machine with a pivotally interconnected movement arm, a trailing link, and an adjustable foot engagement member with a convex surface that allows for proper foot positioning and resistance application, preventing heel lift and accommodating various foot sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed foot platform is used on the movement arm, then the structure is simple, but it cannot accommodate exercisers with different foot sizes and causes heel lift
Solution Approach 1:
The foot engagement member is made adjustable in position along the movement arm, allowing it to be dynamically repositioned to accommodate different foot sizes. This dynamic adjustability resolves the contradiction by enabling the fixed structure to adapt to varying user needs without requiring multiple fixed platforms.
Solution Approach 2:
The foot engagement member is segmented from the fixed platform design, allowing independent adjustment of its position along the movement arm. This segmentation enables the foot engagement member to be positioned optimally for different foot sizes while maintaining the simplicity of the overall structure.
2Ease of operation
If resistance is applied at the ball of the foot with straight legs, then the calf extension range of motion is greater, but the heel lifts off the platform causing instability
Solution Approach 1:
The adjustable foot engagement member allows dynamic positioning to optimize the balance between range of motion and stability. By adjusting the engagement member's position, the system can accommodate greater foot engagement distances while preventing heel lift through proper positioning.
Solution Approach 2:
The movement arm acts as an intermediary between the resistance application point and the foot engagement member. This intermediary mechanism allows the resistance force to be transmitted while maintaining proper foot engagement and preventing heel lift through the pivotal connection.
Data Source
AI summary
An exercise machine for exercising the calf muscles of a seated exerciser includes: a frame configured to rest on an underlying surface; a seat assembly mounted on the frame on which the exerciser sits; a movement arm pivotally interconnected with the frame forwardly of the seat assembly; a heel pad mounted on the frame forwardly of the seat assembly and configured to receive the heel of the exerciser; a trailing link pivotally attached to the movement arm; a foot engagement member attached to the trailing link such that the foot engagement member is positioned above and forwardly of the heel pad, the foot engagement member having an engagement surface configured to receive a portion of the sole of the foot of the exerciser; and a resistance-imparting unit interconnected with the movement arm. The movement arm is movable by the exerciser between a flexed position, in which the sole of the foot of the exerciser engages the engagement surface of the foot engagement member as the heel of the exerciser engages the heel pad, such that the foot is generally perpendicular to the shin of exerciser, and an extended position, in which the foot points away from the shin as the sole of the foot of the exerciser remains engaged with the engagement surface of the foot engagement member and the heel remains engaged with the heel pad.