Spring-Loaded Ball Locking Mechanism for Barbell Collars
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Solution Overview
Problem
Existing locking collars for weight plates on barbells require tools for locking and unlocking, are unclear when tightened sufficiently, and fail to prevent axial sliding when gaps are present, posing safety risks due to imbalance and potential weight detachment.
Innovation Solution
A locking mechanism comprising a cylinder with holes for retaining balls, a tensioning ring, and release mechanisms allowing manual actuation to frictionally engage the shaft without additional tools, enabling secure attachment and easy removal of weight plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bolting mechanism is used to lock the collar to the barbell, then the weight plates can be securely fixed, but the locking and unlocking process becomes time-consuming and requires multiple turns of the bolt
Solution Approach 1:
The locking mechanism transitions from a static bolted connection to a dynamic spring-loaded ball system. The spring provides continuous force to maintain locking pressure, while the ball can dynamically shift between locked and unlocked positions through the release mechanism, enabling quick transitions without manual tightening/loosening operations
Solution Approach 2:
The manual bolting mechanism is replaced with an automatic spring-loaded ball locking system. The spring mechanism automatically maintains locking force, and the release mechanism provides a simple actuation method (pushing or pulling) that replaces the complex rotational bolt operation, significantly reducing locking/unlocking time
2Reliability
If a bolt is tightened to securely lock the collar, then the weight plates are fixed, but it becomes unclear when the bolt is tight enough, leading to over-tightening and potential damage
Solution Approach 1:
The spring-loaded mechanism provides inherent feedback through its mechanical state. When locked, the spring is compressed and maintains constant pressure on the ball against the barbell, creating a self-regulating system that automatically adjusts to the correct locking force without requiring user judgment or risk of over-tightening
Solution Approach 2:
The locking mechanism is self-regulating through the spring force. The spring automatically maintains the ball in the locked position with appropriate pressure, and the release mechanism allows easy disengagement without requiring the user to judge or control the tightening force, eliminating over-tightening risks
3Reliability
If traditional locking collars are used, then weight plates can be secured, but they fail to prevent axial sliding when gaps are present between weight plates, creating safety risks
Solution Approach 1:
The locking mechanism applies localized radial pressure through the ball against the barbell shaft at the collar interface. This concentrated radial force creates friction that resists axial sliding forces on the weight plates, preventing both detachment and unintended movement even when gaps are present between 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
The mechanism provides secure attachment and easy adjustment of weight plates without tools, preventing axial sliding and ensuring user safety by maintaining balance and stability during use.
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
Implementation Method 2
frictionally engage the shaft
Data Source
Figure 1
Figure 2A
Figure 2B
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.