Retractable Apparatus Ratchet Mechanism Prevents Accidental Retraction
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Solution Overview
Problem
Conventional retractable belt barriers lack a mechanism to maintain the protruding length of the retractable unit, leading to accidental retraction and potential user injury when the unit is released unintentionally.
Innovation Solution
A retractable apparatus with a housing unit, a rotating unit, and a retractable unit, where the housing unit features a housing teeth set and a rotating unit with a shaft teeth set that cooperatively prevent rotation in one direction while allowing rotation in the opposite direction, ensuring the retractable unit maintains its extended position and prevents accidental retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the retractable unit is designed to be automatically retracted when released, then the retraction function is convenient and automatic, but the user may be struck by the retractable unit causing safety hazards
Solution Approach 1:
The patent applies preliminary anti-action by designing a teeth engagement mechanism between the housing unit and rotating unit that prevents unintended rotation. The teeth on the housing unit engage with corresponding teeth on the rotating unit, creating a mechanical lock that counteracts the elastic force before accidental retraction can occur. This preliminary preventive mechanism ensures the retractable unit remains extended until intentionally retracted, eliminating the safety hazard while maintaining automatic retraction functionality.
2Reliability
If the retractable unit protrudes out of the housing unit to maintain extended position, then the barrier function is effective, but the structure becomes more complex requiring additional maintenance mechanisms
Solution Approach 1:
The patent merges the teeth engagement mechanism directly into the housing unit and rotating unit structure, combining the maintenance function with the existing structural components. The teeth on the housing unit and rotating unit are integrated into the overall assembly, eliminating the need for separate maintenance mechanisms. This merging approach maintains the extended position reliably while minimizing additional structural complexity.
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 apparatus effectively maintains the extended position of the retractable unit, preventing accidental retraction and user injury, while allowing convenient and controlled retraction when desired.
Implementation Method 1
the elastic unit 124 is pulled, so that the elastic unit 124 deforms and stores elastic force. When the user releases the retractable unit 123, the elastic unit 124 releases the elastic force and drives the rotating unit 122 to rotate
Data Source
AI summary
A retractable apparatus includes a housing unit, a rotating unit and a retractable unit. The housing unit is formed with a housing teeth set therein. The rotating unit is disposed in and rotatable relative the housing unit. An end portion of the rotating unit is formed with a shaft teeth set engaging the housing teeth set. The shaft teeth set and the housing teeth set cooperatively prevent the rotating unit from rotating relative to the housing unit in a first turning direction. The shaft teeth set cooperates with the housing teeth set to allow the rotating unit to rotate in a second turning direction opposite to the first turning direction relative to the housing unit.