Pulley Stretching Device Mechanical Advantage
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Solution Overview
Problem
Individuals face challenges in performing extended, controlled stretches due to fatigue and inability to exert sufficient force, especially when stretching beyond their comfort threshold, which limits the effectiveness of therapeutic and athletic stretching.
Innovation Solution
A stretching device utilizing a fixed anchor point, pulleys, and a motion transfer line, allowing users to leverage mechanical advantages by attaching the first anchor assembly to their limb and the second anchor assembly to a stationary object, enabling prolonged and intensified stretches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an individual attempts to perform extended controlled stretches beyond their comfort threshold, then the effectiveness of stretching is increased, but the individual experiences fatigue and inability to maintain the stretch position
Solution Approach 1:
The patent introduces a stretching device with pulleys and a motion transfer line as an intermediary mechanism between the user and the stretch position. This device provides mechanical advantage, allowing users to achieve and maintain stretches beyond their natural capability without direct muscular effort, thereby resolving the contradiction between stretching effectiveness and ease of operation
Solution Approach 2:
The stretching device enables self-service by allowing users to independently achieve and maintain therapeutic stretch positions without requiring assistance from others. The mechanical advantage system automatically holds the stretch position through its pulley and motion transfer line mechanism, eliminating the need for external support
2Duration of action of moving object
If an individual attempts to hold a stretch for longer periods to prevent injury and aid rehabilitation, then the benefits are increased, but fatigue sets in making it difficult to maintain the position
Solution Approach 1:
The stretching device acts as an intermediary that mechanically maintains the stretch position over extended periods. The pulley system and motion transfer line provide continuous positional support without requiring the user to exert ongoing muscular effort, enabling prolonged stretch duration while maintaining ease of operation
Solution Approach 2:
The device creates a counterbalancing mechanical system that opposes the user's body weight and gravitational forces. By using pulleys and tensioned motion transfer lines, the system provides an anti-weight effect that supports the limb in the stretched position, allowing long-duration holds without fatigue
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 users to perform extended, controlled stretches with reduced fatigue, allowing for deeper muscle engagement and increased effectiveness in both therapeutic and athletic applications, and can also be repurposed for lifting and repositioning limbs or bodies.
Implementation Method 1
A stretching device that can be anchored to a variety of objects for performing controlled stretches while providing a mechanical advantage
Data Source
AI summary
A stretching device that enables a user to employ the mechanical advantage of a multi-pulley system while performing various, prolonged muscle stretches; the stretching device including a first anchor assembly, a second anchor assembly, and a motion transfer line. The first motion transfer line has a first anchor body and a first motion transfer pulley; the first anchor body being attached to the user and the first motion transfer pulley being coupled to the first anchor body. Similarly, the second motion transfer line has a second anchor body and a second motion transfer pulley; the second anchor body being attached to a stationary object and the second motion transfer pulley being coupled to the second anchor body. The motion transfer line is terminally attached to the first anchor body and is trained around both the first motion transfer pulley and the second motion transfer pulley.