Counterbalanced Exercise Arm for One-Handed Angle Adjustment
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Solution Overview
Problem
Conventional exercise devices require two hands to adjust the position of arms, making them difficult or dangerous for individuals with disabilities to use safely and effectively.
Innovation Solution
The exercise device incorporates a counterbalanced arm mechanism with a pivot connection and counterweight, allowing single-handed adjustment of the arm's angular position using an adjustment pin and dial, which remains locked in place without external support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional two-handed adjustment mechanism is used, then the arm position can be securely adjusted, but the device becomes inaccessible and dangerous for individuals with disabilities
Solution Approach 1:
A counterweight is connected to the arm at the pivot connection to balance the arm's weight. This counterbalancing mechanism allows the arm to be easily moved and positioned with one hand, while automatically maintaining stability at the selected position without requiring continuous manual support
Solution Approach 2:
The adjustment mechanism allows a single user to independently perform the entire adjustment operation using one hand. The user removes the pin, positions the arm, and reinserts the pin without needing external support or a second hand to stabilize the arm during adjustment
2Ease of operation
If the arm is made lightweight for easy adjustment, then single-handed operation becomes feasible, but the arm may become unstable or prone to inadvertent movement
Solution Approach 1:
The counterweight balances the arm's weight, creating a neutral equilibrium that reduces the effort required to move the arm while maintaining stability at positioned settings. The counterweight compensates for the arm's weight, allowing easy single-handed adjustment without sacrificing positional stability
Solution Approach 2:
The adjustment pin serves as a simple, removable component that provides temporary locking during adjustment. When inserted into the adjustment plate holes, it secures the arm position; when removed, it allows free movement. This simple mechanical solution provides reliable positioning without complex mechanisms
3Ease of operation
If an adjustment mechanism with multiple holes and pins is added, then single-handed adjustment is enabled, but the device complexity increases
Solution Approach 1:
The adjustment mechanism is segmented into discrete, simple components: an adjustment plate with multiple holes, a removable pin, and a counterweight. This segmentation allows each component to perform a specific function independently, simplifying the overall mechanism while enabling single-handed operation
Solution Approach 2:
The adjustment pin is a simple, inexpensive mechanical element that provides the locking function. It is removed during adjustment and reinserted to secure the position, serving its purpose temporarily and then being set aside. This simple component enables complex functionality without adding significant complexity to the system
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 single-handed adjustment of arm positions, improving accessibility and safety for users with disabilities by reducing the likelihood of inadvertent movement and enhancing the overall exercise experience.
Implementation Method 1
a counterweight connected to the arm at the pivot connection. The counterweight balances the arm about the pivot connection
Data Source
AI summary
A cable-operated exercise device includes an adjustable arm. The adjustable arm includes an adjustment mechanism that is operable by a single hand. To adjust the vertical angular position of the arm, the user pulls a pin out of a positioning hole on an adjustment plate. The arm is counterbalanced about a pivot connection so that the position of the arm does not change when the pin is pulled out of the positioning hole. The user then moves the arm into a second position and puts the pin back into a second positioning hole.