Bicycle Shift Lever Independent Pivot Mechanism
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Solution Overview
Problem
Existing bicycle shift operating devices often require complex arrangements for independent operation of levers, which can lead to cumbersome designs and reduced ease of use.
Innovation Solution
A bicycle shift operating device featuring a base member, shift unit, first and second operating levers, and biasing elements that allow independent operation of the levers, with the first operating lever biased to a rest position and the second lever able to move independently without moving the first lever, simplifying the arrangement and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex arrangement is used to enable independent operation of operating levers, then the levers can operate independently, but the device complexity increases
Solution Approach 1:
The operating levers are segmented into independent pivotable units, each capable of independent operation. The first operating lever is pivotally mounted relative to the base member about a first pivot axis, while the second operating lever is pivotally mounted on the first operating lever about a second pivot axis, allowing each lever to function independently without complex coupling mechanisms.
Solution Approach 2:
The system employs dynamic biasing elements (springs) that automatically adjust to maintain the first operating lever at its rest position while allowing the second operating lever to move independently. The first biasing element biases the first operating lever towards the first rest position, and the second biasing element biases the first operating lever towards the first rest position in response to independent movement of the second operating lever, enabling independent operation without complex mechanical constraints.
2Device complexity
If the second operating lever is mounted on the first operating lever, then the structure is simplified, but the first operating lever may move unintentionally when the second lever operates
Solution Approach 1:
The first biasing element acts as a counterbalancing mechanism that applies a restoring force to the first operating lever, keeping it at its rest position while the second operating lever moves independently. This biasing force counteracts any unintended movement of the first lever caused by the operation of the second lever, maintaining positional stability without requiring complex mechanical constraints.
3Stability of the object's composition
If biasing elements are used to maintain rest positions, then lever positioning is improved, but the device complexity increases
Solution Approach 1:
The biasing elements serve multiple functions: the first biasing element maintains the first operating lever at its rest position, while the second biasing element not only maintains the first operating lever at rest but also responds to independent movement of the second operating lever. This multi-functional use of biasing elements achieves stable lever positioning with a relatively simple arrangement, avoiding the need for additional complex positioning mechanisms.
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 design enables a more straightforward and efficient operation of the shift operating device, allowing for independent movement of levers without the need for complex mechanisms, enhancing user experience and device simplicity.
Implementation Method 1
The first biasing element biases the first operating lever towards the first rest position to keep the first operating member at the first rest position
Implementation Method 2
The second biasing element biases the first operating lever towards the first rest position in response to independent movement of the second operating lever from the second rest position to the second shifting position while the first operating lever remains at the first rest position
Data Source
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AI summary
A bicycle shift operating device is basically provided with a base member, a shift unit, a first operating lever, a second operating lever, a first biasing element and a second biasing element. The first operating lever operates the shift unit by pivoting about a first pivot axis between a rest position and a shifting position. The second operating lever operates the shift unit by pivoting about a second pivot axis on the first operating lever between a rest position and a shifting position. The first biasing element biases the first operating lever towards the first rest position to keep the first operating member at the first rest position. The second biasing element biases the first operating lever towards its rest position in response to independent movement of the second operating lever from its rest position to its shifting position while the first operating lever remains at its rest position.