Barbell Locking Collar with Ball Friction Mechanism
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Solution Overview
Problem
Existing locking collars for barbells require tools for locking and unlocking, are unclear about tightness, and fail to prevent axial sliding of weight plates, leading to balance and safety issues.
Innovation Solution
A locking mechanism comprising a cylinder with holes for balls that frictionally engage a shaft, using a tensioning ring and biasing mechanism to secure the weight, with release mechanisms allowing easy sliding onto and off the shaft without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking collar is used to secure weight plates on a barbell, then the weight plates are fixed relative to the barbell, but the locking collar requires additional tools for locking and unlocking
Solution Approach 1:
The locking collar is designed to be self-operating through a cam mechanism. When the collar is rotated, the cam surface automatically engages with the barbell shaft, creating a locking action without requiring external tools. The spring mechanism provides automatic engagement and maintenance of the locked state, allowing users to lock and unlock the collar simply by rotating it with their hands.
2Reliability
If a bolting mechanism is used in the locking collar, then the collar can be tightened to secure the weight, but it is unclear when the bolt is tight enough, leading to over-tightening
Solution Approach 1:
The locking collar incorporates visual indicators such as colored markings or alignment features that change position or become visible when the collar is properly locked. For example, a index mark on the collar aligns with a corresponding mark on the barbell shaft when locked, providing clear visual feedback to the user that the correct tightening level has been achieved, eliminating the need to judge tightness by feel or multiple tightening cycles.
3Object-affected harmful factors
If a locking collar is used to prevent weight plates from sliding off the barbell, then safety is improved, but the collar increases the complexity of the device
Solution Approach 1:
The locking collar integrates multiple functions into a single component: the collar body provides the locking mechanism, the spring provides the biasing force, the cam surface provides the engagement geometry, and the release mechanism is incorporated into the same structure. This consolidation reduces the number of separate parts and simplifies the overall assembly, making the device less complex while maintaining safety functionality.
4Reliability
If traditional locking collars are used, then weight plates can be secured, but the collars require successive tightening turns which consume time
Solution Approach 1:
The locking collar is pre-loaded with a spring mechanism that maintains constant engagement pressure with the barbell shaft. This preliminary action ensures that the locking force is already in place before the user begins to rotate the collar, eliminating the need for multiple successive tightening turns. The cam mechanism is pre-positioned to engage immediately upon rotation, significantly reducing the time required to secure the weight plates.
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
Provides secure attachment and easy adjustment of weight plates on a barbell, preventing axial sliding and improving user safety by ensuring consistent locking without the need for additional tools.
Implementation Method 1
A biasing mechanism acts against the second cylinder in a first direction to urge the balls into the interior of the first cylinder in order to frictionally engage the shaft
Data Source
AI summary
A locking mechanism for a shaft provides secure frictional engagement to the shaft while manually operable to be removed from the shaft. There is a first cylinder allowable to slide freely on the shaft. One or more holes retaining one or more balls allow a projection of the balls into an interior of the first cylinder. A tensioning ring (second cylinder) partially overlaps the first cylinder, retains the balls within the holes, and has at least a portion of the inside diameter increasing in diameter. A biasing mechanism acts against the second cylinder to urge the balls into the first cylinder interior to frictionally engage the shaft. Two release mechanisms movable with the biasing mechanism manually actuated against the bias move the second cylinder to allow the balls to freely move within the holes and the locking mechanism to be slid onto and removed from the shaft.