Bicycle Shift Control Positioning Mechanism for Compact Design
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Solution Overview
Problem
Conventional bicycle shift control devices are limited in design compactness due to the placement of the release lever away from the positioning member, which restricts the ability to create a compact shift control device.
Innovation Solution
A positioning apparatus for a bicycle shift control device featuring a movable member, a positioning member that biases towards an engaged position, and a releasing member positioned between the movable and positioning members, allowing the positioning member to move between engaged and disengaged positions, thereby enabling a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the release lever is located away from the positioning member, then the positioning mechanism can be structured with conventional components, but the shift control device cannot be made compact
Solution Approach 1:
The releasing member integrates multiple functions: it acts as both the release lever for disengaging the positioning member and as part of the cable release mechanism. By combining these functions into a single component positioned between the movable member and positioning member, the overall device volume is reduced while maintaining the positioning mechanism's operational complexity
Solution Approach 2:
The positioning member moves toward and away from the plane of movement of the movable member, utilizing the third dimension (axial direction) rather than only planar movement. This dimensional change allows compact arrangement of components along the axial direction, reducing the device's footprint in the planar view
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
This configuration allows for a more compact shift control device design by optimizing the placement of components, enhancing the device's operational efficiency and reducing its size without compromising functionality.
Implementation Method 1
a biasing member that biases the positioning member towards an engaged position such that the positioning element of the positioning member engages the positioning element of the movable member
Data Source
AI summary
A positioning apparatus for a shift control device for a bicycle transmission comprises a movable member having a positioning element, a positioning member having a positioning element structured to engage the positioning element of the movable member, and a biasing member that biases the positioning member towards an engaged position wherein the positioning element of the positioning member engages the positioning element of the movable member. The positioning member moves toward and away from a plane of movement of the movable member. A releasing member is disposed between the movable member and the positioning member, wherein the releasing member moves between an initial position and an operating position. The releasing member allows the positioning member to be in the engaged position when the releasing member is in the initial position, and the positioning member moves to the disengaged position when the releasing member moves to the operating position.