Exercise Device Adjustment Pin Anti-Loosening Mechanism
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Solution Overview
Problem
Adjustment pins in exercise devices often experience loose or disconnected knobs due to threaded connections, leading to usability issues, potential damage, and safety risks when the knob becomes lost or difficult to remove.
Innovation Solution
Incorporating a bushing and fastener system that allows the knob to rotate independently of the cylindrical body, preventing unscrewing or loosening, and ensuring the knob remains securely connected through a rotatable interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a threaded connection is used to join the knob to the adjustment pin, then the knob can be easily attached and removed, but the threaded connection becomes loose or disconnected during use
Solution Approach 1:
The adjustment pin is divided into separate functional components: a cylindrical body for insertion, a bushing for rotational movement, and a knob for user operation. This segmentation allows each component to perform its specific function optimally while reducing interference between them.
Solution Approach 2:
A bushing is introduced as an intermediary component between the cylindrical body and the knob. The bushing provides a rotation interface that allows the knob to rotate independently without causing the threaded connection to loosen, while still maintaining secure attachment.
2Reliability
If the knob is securely fastened to prevent loosening, then connection stability is improved, but the knob cannot be easily removed or adjusted
Solution Approach 1:
The connection between the knob and cylindrical body is made dynamic rather than static. The bushing allows rotational movement while maintaining axial connection, enabling the knob to rotate freely for adjustment while preventing complete detachment or loosening during use.
3Ease of operation
If the knob can rotate freely for adjustment, then ease of operation is improved, but the threaded connection becomes loose or disconnected
Solution Approach 1:
The bushing acts as a mediator that decouples the rotational movement from the threaded connection. It allows the knob to rotate smoothly for adjustment while the threaded portion remains engaged with the cylindrical body, preventing loosening or disconnection.
Data Source
AI summary
An adjustment pin for an exercise device includes a knob, a bushing, and a cylindrical body. The bushing partially inserts into the knob and a fastener passes through the bushing to connect to the knob with a threaded connection. The fastener connects the bushing to the knob with a rotatable connection such that the knob and the bushing can rotate with respect to each other. The cylindrical body securely connects to the bushing such that the knob is indirectly and rotatably connected to the cylindrical body. The knob can rotate without unscrewing from the adjustment pin.