Quick-Release Arm Structure With Short-Travel Tooth Repositioning
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Solution Overview
Problem
Existing bicycle quick release devices face safety and aesthetic issues due to handle positioning problems and require a longer travel distance for operation, leading to difficulties in engagement and disengagement.
Innovation Solution
A quick release structure featuring a rod member with spaced teeth and an arm member with a sleeving portion, allowing for axial slidable engagement and rotation, utilizing a restriction member and pushing means to ensure secure positioning and easy adjustment, with teeth rows that can alternate between engaged and disengaged positions for rotational capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the teeth for engagement are distributed on a large region to ensure sufficient engagement area and driving effect, then the engagement reliability is improved, but the handle portion has to be moved for a relatively longer travel distance which causes difficulty for operation
Solution Approach 1:
The toothed structure is segmented into multiple rows of teeth (first teeth on the rod member, second teeth on the arm member) arranged axially. This segmentation allows the engagement force to be distributed across multiple tooth pairs, providing sufficient engagement reliability while maintaining a compact axial profile that limits the travel distance required for operation.
Solution Approach 2:
The invention transitions from a single-row tooth engagement to a multi-row axial tooth arrangement. By utilizing the axial dimension to distribute multiple rows of teeth, the system achieves sufficient engagement area without requiring excessive axial travel distance, thus resolving the contradiction between engagement reliability and ease of operation.
2Object-affected harmful factors
If the handle portion is axially slidable relative to the shaft to allow repositioning, then the aesthetic and safety issues are improved, but the structure complexity increases
Solution Approach 1:
The sliding mechanism is merged with the toothed engagement system. The handle portion's axial sliding motion is directly coupled with the disengagement of teeth rows, combining the repositioning function with the existing engagement mechanism. This integration allows aesthetic and safety improvements without adding separate complex control systems.
Solution Approach 2:
The axial sliding of the handle portion automatically triggers the disengagement of teeth through the pushing means, which forces the arm member axially to disengage from the rod member's teeth. This self-service mechanism allows repositioning without requiring additional actuators or complex control systems, minimizing structure complexity while achieving safety and aesthetic goals.
3Productivity
If the sleeving portion is designed to slide axially between engaged and rotation positions, then the operational speed is improved, but the force required for sliding increases
Solution Approach 1:
The toothed engagement is segmented into multiple rows arranged axially, distributing the engagement force across multiple tooth pairs. This segmentation reduces the force required at any single point during sliding, allowing rapid transition between engaged and rotation positions while maintaining strong overall engagement when locked.
Solution Approach 2:
The design changes the engagement parameter from single-point contact to distributed multi-row tooth contact. This parameter change allows the sliding action to be performed with reduced force by distributing the load across multiple teeth, enabling faster operation while maintaining structural integrity during the transition between positions.
Data Source
AI summary
A quick release structure includes a rod member, an arm member, a restriction member, and a pushing means. The rod member includes a toothed member having a plurality of rows of first teeth arranged spacedly thereon. The arm member has a plurality of rows of second teeth arranged spacedly on its inner peripheral surface. The arm member is sleeved on the toothed member and is axially slidable. The restriction member is disposed on the rod member. The pushing means is arranged between the rod member and the arm member to make the rows of first teeth and the rows of second teeth being engaged normally. When the arm member is moved axially to a rotation position, the rows of first teeth and the rows of second teeth are staggered and aligned alternately so that the arm member is rotatable relative to the rod member.