Switch Assembly Multi-State Control via Pivoting Element
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Solution Overview
Problem
Switches in limited spaces, such as vehicle headliners, often struggle to provide precise multi-level control due to difficulties in controlling the pressing force, leading to unintended level changes.
Innovation Solution
A switch assembly with a button and pivoting element featuring distinct contact parts and positioning elements, where the forces required to move these elements out of their respective sections differ, allowing for precise state changes through varying elastic moduli, coefficients of friction, and slope configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple switch button is used in limited space, then the device complexity is reduced, but the precision of multi-level control deteriorates due to inability to control pressing force
Solution Approach 1:
The switch button is segmented into multiple independent pressing regions (first pressing region, second pressing region, third pressing region) corresponding to different contact parts. Each region can be pressed independently to achieve different switching levels, enabling precise multi-level control while maintaining a compact single-button structure.
Solution Approach 2:
Different regions of the button surface are designed with different local properties - the first pressing region has a first coefficient of friction, the second pressing region has a second coefficient of friction, and the third pressing region has a third coefficient of friction. This allows each region to require different pressing forces, enabling precise control over which contact part is activated.
2Reliability
If pressing force is increased to ensure reliable contact, then electrical contact reliability is improved, but the risk of skipping to unexpected levels increases
Solution Approach 1:
Each contact part is assigned a different coefficient of friction (first, second, and third coefficients) corresponding to different pressing force requirements. This ensures that each level can be reliably activated with its specific force threshold, preventing accidental skipping to higher levels while maintaining reliable electrical contact at each state.
Solution Approach 2:
The patent varies the friction parameters (coefficients of friction) across different contact parts to create distinct force thresholds for each switching level. This parameter differentiation ensures that each level requires a specific pressing force, making level transitions predictable and reliable without skipping unintended levels.
3Measurement precision
If multiple positioning elements are added to achieve precise multi-level control, then the precision of state positioning is improved, but the device complexity increases
Solution Approach 1:
Multiple positioning elements (first, second, and third positioning elements) are merged into a single integrated pivoting element structure. This pivoting element extends from the button and incorporates all contact parts and positioning elements in one unified component, achieving precise multi-level control without the complexity of separate mechanisms for each level.
Solution Approach 2:
The pivoting element serves multiple functions simultaneously - it provides the button's rotational movement, contains all contact parts (first, second, third contact parts) for different switching levels, and incorporates all positioning elements (first, second, third positioning elements) for state detection. This multi-functionality reduces overall device complexity while maintaining precise positioning capability.
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
Enables accurate switching between multiple states with reduced risk of unintended level changes by requiring distinct forces for each state transition, enhancing user control and reducing errors.
Implementation Method 1
the first elastic part and the second elastic part, and the direction of an elastic force of the first elastic part and the second elastic part are substantially perpendicular to surfaces of the first contact part and the second contact part
Implementation Method 2
a coefficient of friction of a side wall of the first positioning section of the first contact part is greater than a coefficient of friction of a side wall of the second positioning section of the second contact part
Data Source
AI summary
A switch assembly comprises a button, a pivoting element, a first positioning element, and a second positioning element. The button has a first, second, and third states. The pivoting element extends from a height direction of the button, and has first and second contact parts arranged in the height direction. Surfaces of the first and second contact parts have different contours. The first positioning element and the second positioning element respectively correspond to the first contact part and the second contact part, and are movable relative to each other. A function of the first positioning element and a first positioning section of the first contact part is configuring the first state, and functions of the second positioning element and a second positioning section and a third positioning section of the second contact part are respectively configuring the second state and the third state.