Bicycle Shift Control Device with Integrated Gear Indicator
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Solution Overview
Problem
Existing bicycle shift control devices with gear indicators are often complex, difficult to manufacture, and clutter the handlebar, lacking a simple and attractive solution for indicating gear status.
Innovation Solution
A bicycle shift control device with a housing, rotatable member, and flexible elongated member, where the rotatable member rotates in response to operating lever movement, and the flexible member's tip is visible through a window to indicate gear position, providing a simple and easy-to-read gear indicator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a separate gear indicator unit is mounted to the handlebar connected by cables, then the gear status can be indicated, but the handlebar becomes cluttered and the device becomes unattractive
Solution Approach 1:
The gear indicator portion is merged with the shift control device housing, integrating the indicator function into the existing structure. The flexible elongated member is contained within the housing and moves through a window, combining the indicator mechanism with the control device itself rather than using a separate handlebar-mounted unit.
Solution Approach 2:
The gear indication function is extracted from a separate cable-connected unit and integrated into the shift control device housing. The flexible elongated member is extracted from complex mechanical linkages and simplified to a flexible element that moves freely within the housing to indicate gear position.
2Device complexity
If a pin indicator or rotary device is built into the shift control device, then the gear indicator is integrated, but the device becomes complex and difficult to manufacture and adjust
Solution Approach 1:
The flexible elongated member is implemented as a simple, inexpensive flexible element rather than a complex mechanical rotary device or precision pin indicator. This simple flexible member can be easily manufactured and replaced if needed, significantly reducing manufacturing complexity and cost.
Solution Approach 2:
The indicator mechanism uses a flexible member that changes position along a path within the housing rather than requiring precise rotary mechanics or pin positioning. This parameter change from rigid mechanical indication to flexible positional indication simplifies manufacturing and adjustment.
3Loss of information
If a complex mechanical indicator mechanism is used, then gear position can be indicated, but the device is difficult to adjust and manufacture
Solution Approach 1:
The indicator uses a flexible elongated member that can dynamically move along a guide path within the housing in response to gear position changes. This dynamic flexible movement replaces static or mechanically complex adjustment mechanisms, making the device easier to manufacture and adjust.
Data Source
AI summary
A bicycle shift control device includes a housing, at least one operating lever, a rotatable member, a flexible elongated member, and a gear indicator portion having a window. The rotatable member has a guide member and is disposed within the housing. The rotatable member is configured to rotate in response to movement of the at least one operating lever. The flexible elongated member has a first end portion and a second end portion. The first end portion is connected to the rotatable member for movement therewith and extends at least part-way along the guide portion of the rotatable member. The second end portion is configured for movement along the gear indicator portion with at least a tip of the second end portion of the flexible elongated member being visible through the window of the gear indicator portion.