Bicycle Shifting Device with Segmented Release Pawl
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Solution Overview
Problem
Existing bicycle operating devices lack efficient mechanisms for quickly and effectively performing multiple releasing operations, particularly in adjusting bicycle components like gear shifting devices, which are crucial for riders to manage speed stages during rides.
Innovation Solution
The bicycle operating device incorporates a base member with a positioning ratchet, positioning member, release member, and release pawl, featuring first and second positioning pawls that move between holding and releasing positions, allowing for bi-directional pivoting and independent operation to manage cable positions efficiently, enabling rapid and precise adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single positioning pawl is used to hold the positioning ratchet, then the device structure is simple, but the releasing operation cannot be performed quickly multiple times
Solution Approach 1:
The positioning member is divided into two separate positioning pawls (first positioning pawl and second positioning pawl) that can operate independently. Each pawl can be released separately, enabling rapid multiple releasing operations without requiring a complex repositioning mechanism. This segmentation allows the device to achieve quick successive releases while maintaining a relatively simple overall structure.
2Reliability
If the positioning member is designed to move between holding and releasing positions, then the positioning function is achieved, but the device size increases
Solution Approach 1:
The first positioning pawl and second positioning pawl are integrated into a single positioning member that moves together between holding and releasing positions. This merging approach ensures reliable positioning function while minimizing the increase in device volume, as the pawls share common mounting and movement mechanisms rather than requiring separate mounting spaces.
3Productivity
If the release pawl has only a single pawl part, then the structure is simple, but it cannot effectively move the release member for multiple operations
Solution Approach 1:
The release pawl is divided into two distinct pawl parts (first pawl part and second pawl part) that can selectively contact the release member at different positions. This segmentation enables the release pawl to effectively move the release member for multiple successive releasing operations, as each pawl part can engage the release member in sequence. The increased complexity of having two pawl parts is justified by the significant improvement in releasing operation efficiency.
Data Source
AI summary
A bicycle operating device includes a base member, a positioning ratchet, a positioning member, a release member and a release pawl. The positioning ratchet pivots about a pivot axis in first and second directions. The positioning member moves between a holding position that prevents pivoting of the positioning ratchet in the first direction, and a releasing position that releases the positioning ratchet to pivot in the first direction. The release member moves the positioning member from the holding position to the releasing position as the release member moves with respect to the base member. The release pawl is movably mounted with respect to the base member to move the release member. The release pawl includes first and second pawl parts that selectively contact the release member as the release pawl moves with respect to the base member. The first and second pawl parts are different from each other.