Bicycle Shifting Lever Angled Pivot Axis Handlebar Clearance
Solution Overview
Problem
Existing bicycle control devices often interfere with the handlebar when the shift operating member moves, as they typically follow a shifting path that aligns with the handlebar, leading to potential operational limitations and rider discomfort.
Innovation Solution
A bicycle control device with a shift operating member that pivots along a non-shift operating path angled relative to the handlebar, allowing the second operating lever to move rearwardly without interfering with the handlebar, thereby avoiding lateral contact and enhancing operational comfort and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shift operating member moves along a path aligned with the handlebar, then the shifting operation is straightforward, but the operating lever interferes with the handlebar causing operational limitations and rider discomfort
Solution Approach 1:
The patent applies dimensionality change by pivoting the operating lever about an axis that is angled relative to the handlebar axis, causing the lever to move in a three-dimensional arc path rather than a simple linear path. This angular offset creates a movement trajectory that clears the handlebar while maintaining effective cable actuation, resolving the interference problem through spatial reconfiguration.
Solution Approach 2:
The patent segments the operating lever into distinct functional zones: a finger-contact operating end that moves along the angled arc path, and a cable-actuation end that remains positioned to effectively pull the shift cable. This segmentation allows different parts of the lever to perform different functions along different paths, enabling the lever to avoid handlebar interference while maintaining shifting capability.
2Measurement precision
If the operating lever is positioned closer to the handlebar for better control, then the shifting precision improves, but the risk of accidental activation and interference increases
Solution Approach 1:
By introducing the angled pivot axis, the patent creates a three-dimensional operating space that separates the lever's operational path from the handlebar. The lever pivots at an angle that provides sufficient control authority for precise shifting while maintaining clear clearance from the handlebar, thereby eliminating accidental contact and unintended activation.
Solution Approach 2:
The angled pivot axis acts as an intermediary element that mediates between the rider's finger input and the cable actuation. This intermediate pivot point transforms the rider's lateral finger motion into a controlled arc-shaped lever movement that maintains precise cable tension control while preventing direct contact with the handlebar.
3Device complexity
If the operating lever follows a traditional shifting path, then the mechanical linkage is simple, but the device complexity increases due to handlebar interference requiring additional clearance mechanisms
Solution Approach 1:
The patent resolves the complexity issue by using the angled pivot axis to create a natural geometric clearance path. The angular orientation of the pivot axis relative to the handlebar automatically generates sufficient clearance between the lever and handlebar during operation, eliminating the need for additional clearance mechanisms, springs, or complex linkage designs while maintaining simple two-point attachment (pivot and cable).
Data Source
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AI summary
A bicycle control device is basically provided with a base member, a shift control unit and an operating lever. The base member includes a handlebar mounting structure defining a handlebar receiving area with a central handlebar mounting axis. The shift control unit is mounted to the base member. The operating lever is pivotally mounted relative to the base member to pivot from a rest position towards the handlebar receiving area about a non-shift operating pivot axis that is angled relative to the handlebar receiving area such that the operating lever moves along a non-shift operating path that avoid interference with a handlebar in a lateral direction with respect to the handlebar receiving area.