Cam Lever Control for Variable Saddle Height Actuation
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Solution Overview
Problem
Existing control devices for bicycle saddle height adjustment lack efficient and precise actuation mechanisms, particularly in providing adequate leverage during initial actuation and maintaining smooth operation.
Innovation Solution
A control device comprising a base, actuation lever, bearing, and cam body, where the actuation lever is pivotally coupled with the cam body via a bearing, allowing for a variable leverage ratio through rotational adjustment, ensuring smooth and precise actuation with increased leverage at the beginning of the actuation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional actuation mechanism is used for saddle height adjustment, then the device structure is simple, but the leverage ratio is insufficient during initial actuation
Solution Approach 1:
The cam body is designed with a non-circular cross-section that rotates during actuation, dynamically changing the leverage ratio throughout the actuation cycle. The varying distance from the rotation axis to the cable attachment point creates high leverage at the beginning of actuation and reduces it towards the end, optimizing force application without requiring a complex multi-component mechanism.
Solution Approach 2:
The invention changes the geometric parameters of the cam body cross-section to achieve variable leverage. By carefully designing the shape of the cam body (with specific curvature and dimensional variations around its perimeter), the system transforms a simple rotational motion into a variable mechanical advantage system, adjusting the leverage parameter continuously during the actuation cycle.
2Measurement precision
If a simple actuation lever is used, then the device complexity is low, but the actuation precision and smoothness are insufficient
Solution Approach 1:
The cam body introduces dynamic geometric transformation into the actuation mechanism. As the cam body rotates, its non-circular profile converts the linear lever motion into a controlled rotational displacement that varies the leverage ratio, providing smooth and precise actuation of the height adjustment mechanism without requiring additional precision components.
3Force
If a fixed leverage mechanism is used, then the mechanism is simple, but the initial actuation force is insufficient
Solution Approach 1:
The cam body's non-circular cross-section is specifically designed to maximize the leverage ratio at the beginning of the actuation cycle. The geometric parameters of the cam profile are optimized so that when actuation begins, the cable attachment point is positioned to provide maximum mechanical advantage, ensuring sufficient initial actuation force without complex spring or gear 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
The control device provides improved operation and actuation of cable-actuated elements by offering smooth, precise, and quick actuation with enhanced leverage at the start, facilitating efficient adjustment of bicycle saddle height.
Implementation Method 1
actuation lever, pivotally coupled with the cam body via a bearing
Data Source
AI summary
A control device includes a base, a cam body, a bearing, and an actuation lever. The bearing is mounted in the cam body and supported by the base, and the actuation lever is pivotally coupled with the base via the cam body and the bearing for rotation relative to the base.