Barbell Sleeve Retention Mechanism Eliminates Loosening
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Solution Overview
Problem
Existing Olympic bar designs face issues with the retention of rotating sleeves on shafts, as current mechanisms like bolts, pins, and snap rings can loosen due to rotational forces and may compromise the structural integrity of the bar due to gaps in the retention system.
Innovation Solution
A novel combined rotation-retention mechanism using a supporting ring, a joining ring, and an end cap, where the supporting ring functions as both a bushing for free rotation and a retention mechanism to prevent longitudinal sliding, eliminating the need for coaxial bolts and minimizing gaps that can weaken the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bolt is used to retain the rotating sleeve on the shaft, then the sleeve can be securely retained, but the bolt may gradually come loose due to rotational forces
Solution Approach 1:
The retention mechanism is divided into multiple functional components: a retention member with first and second ends, a first retention feature at the first end, and a second retention feature at the second end. This segmentation allows each feature to perform a specific retention function, preventing the entire mechanism from loosening due to rotational forces.
Solution Approach 2:
The retention member combines multiple retention features (first retention feature and second retention feature) into a single integrated component that secures the rotating sleeve to the shaft. This merging ensures that both features work together to prevent loosening, as the rotational forces cannot easily disengage both features simultaneously.
2Ease of operation
If a roll pin or snap ring is used to retain the rotating sleeve, then rotational freedom is allowed, but gaps are created that weaken the bar structure
Solution Approach 1:
Instead of creating gaps to allow rotation (as with roll pins or snap rings), the invention inverts the approach by using a continuous retention member that maintains structural integrity. The retention features are designed to engage with the rotating sleeve and shaft in a way that allows rotation without creating weakening gaps in the bar structure.
3Force
If needle bearings are used in the rotation mechanism, then weight loads are better supported, but the device complexity increases
Solution Approach 1:
The retention member serves multiple functions: it retains the rotating sleeve on the shaft, allows rotational movement, supports weight loads, and prevents loosening. By designing a single component that performs all these functions, the need for separate needle bearings and other complex mechanisms is eliminated, reducing overall device complexity while maintaining weight load capacity.
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
This solution provides a more secure and reliable retention of rotating sleeves, reducing the risk of parts loosening and eliminating squeaking noises, while maintaining smooth rotation and enhancing the structural integrity of the Olympic bar.
Implementation Method 1
needle bearings can take the weight loads better and are preferred over ball bearings
Implementation Method 2
the supporting ring abuts, on one side, a shoulder on an inner surface of the sleeve and, on the other side, the joining ring
Data Source
AI summary
A barbell includes a bar assembly that includes a sleeve rotatably fitted over a rotating-locking mechanism at an end of a shaft; and an end cap attached to an open end of the sleeve to enclose the rotating-locking mechanism and the end of the shaft inside the sleeve, in which the rotating-locking mechanism includes a supporting ring rotatably fitted over the shaft and a joining ring attached to the end of the shaft, in which the supporting ring abuts, on one side, a shoulder on an inner surface of the sleeve and, on the other side, the joining ring.