Bicycle Shifting Mechanism Merging Pull and Release
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Solution Overview
Problem
Existing bicycle component operating devices require separate mechanisms for pulling and releasing, making them less efficient and more complex, as they often necessitate movement in different directions for these operations.
Innovation Solution
A bicycle component operating device comprising a base member, an operating member, a positioning ratchet member, a pulling pawl, a positioning pawl, a release member, and a releasing pawl, allowing for both pulling and releasing operations in the same direction by utilizing a pivot axis and biasing elements to manage the rotation of these components effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate mechanisms are used for pulling and releasing operations, then the device can perform both functions, but the device complexity increases and efficiency decreases
Solution Approach 1:
The patent combines the pulling and releasing operations into a single operating member (cable pull) that performs both functions sequentially. The ratchet mechanism integrates the releasing function automatically when the operating member returns, eliminating the need for separate releasing mechanisms and reducing overall device complexity while maintaining operational reliability
Solution Approach 2:
The operating member is designed to serve multiple functions: it performs both pulling (engagement) and releasing (disengagement) operations through a single actuation. The ratchet member and pawl assembly provide universal functionality by automatically enabling releasing during the return stroke, allowing one component to handle what previously required separate mechanisms
2Ease of operation
If separate mechanisms are used for pulling and releasing, then both functions can be performed, but the ease of operation deteriorates due to requiring movement in different directions
Solution Approach 1:
The patent merges pulling and releasing into a single unidirectional operating sequence. The cable pull operates in one direction to engage, and the automatic ratchet mechanism handles releasing during the return, eliminating the need for complex bidirectional control mechanisms and simplifying the user interface
Solution Approach 2:
The ratchet mechanism provides self-service by automatically performing the releasing function when the operating member returns to its initial position. This eliminates the need for the user to perform separate releasing actions, improving ease of operation while the mechanical complexity is contained within the automatic mechanism rather than the user interface
Data Source
AI summary
A bicycle component operating device has a base member, an operating member, a positioning ratchet member, a pulling pawl, a positioning pawl, a release member and a releasing pawl. The positioning ratchet member is rotatably mounted to the base member. The pulling pawl rotates the positioning ratchet member in a first rotational direction in response to a pulling operation of the operating member. The positioning pawl prevents rotation of the positioning ratchet member in the second rotational direction while the positioning pawl is in a holding position. The positioning pawl releases the positioning ratchet member for rotation in the second rotational direction while the positioning pawl is in a releasing position. The releasing pawl moves the release member in response to a releasing operation of the operating member. The release member moves the positioning pawl from the holding position to the releasing position in response to the releasing operation.