Single-Handed Adjustment Exercise Machine Arm
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Solution Overview
Problem
Existing strength training machines lack the ability to be easily configured for various exercises, limiting user flexibility and effectiveness in strength training routines.
Innovation Solution
The development of an exercise machine with a modular design that includes adjustable arms capable of single-handed adjustment, allowing for vertical and horizontal pivoting, and equipped with a differential mechanism to manage cable tension effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional strength training machines are designed with fixed configurations, then manufacturing and operation are simpler, but versatility and adaptability for various exercises are limited
Solution Approach 1:
The arm is divided into multiple independent adjustment components including a pivot mechanism for vertical angle adjustment and a locking mechanism for horizontal position adjustment. This segmentation allows each component to be optimized independently while providing comprehensive adjustability when combined.
Solution Approach 2:
The arm transitions from a fixed position to a dynamically adjustable position through the pivot mechanism. The arm can be rotated vertically to different angles and locked at desired positions, enabling the same machine to adapt to various exercise configurations and user needs.
2Ease of operation
If adjustment mechanisms require two hands to operate, then locking security is improved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is designed to be automatically engaged when the arm reaches the desired position. The user simply needs to operate a single-handed release button to unlock and reposition the arm, after which the locking mechanism automatically secures the arm at the new position without requiring manual intervention to re-lock.
Solution Approach 2:
The complex two-handed locking operation is extracted and replaced with a simple single-handed button release mechanism. The actual locking function is performed automatically by the mechanism itself rather than requiring continuous user engagement, simplifying the user interaction while maintaining security.
3Reliability
If cable tension is not properly managed during arm movement, then mechanical simplicity is maintained, but exercise effectiveness and user safety deteriorate
Solution Approach 1:
The differential pulley system provides more cable tension control than strictly necessary for basic operation. By using a differential mechanism with two different pulley diameters, the system creates a mechanical advantage that provides excessive tension control capability, ensuring smooth and controlled arm movement throughout the entire range of motion while maintaining mechanical efficiency.
Data Source
AI summary
An exercise device includes a resistance unit having a connecting gear. It further includes a cable. It further includes an arm that routes the cable to an actuator. The arm is rotatable relative to the resistance unit about the connecting gear, the arm having a central axis. The arm includes a control that mechanically disengages a locking mechanism from the connecting gear. The control is activated by an activation force substantially directed either toward the central axis of the arm, along a length of the arm, or about the central axis. The activation force is mechanically converted into linear force along the arm that disengages the locking mechanism from the connecting gear.