Snap-Action Switch Contact Structure for Oxide-Resistant Switching
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Solution Overview
Problem
Existing switch devices with snap action mechanisms lack efficiency in contact switching due to reliance on separate components for fixed contacts, which increases complexity and vulnerability to conduction failures from oxide layers.
Innovation Solution
A switch device design featuring a movable terminal with a snap action mechanism that bends a spring, contacting a first fixed terminal when not bent and a second fixed terminal when moved, with the second fixed terminal incorporating a machined fixed contact, reducing component count and enhancing robustness through multiple contact points and sliding capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate fixed contact components are used in switch devices, then the contact switching function can be achieved, but the device complexity increases and vulnerability to conduction failures from oxide layers increases
Solution Approach 1:
The patent merges the fixed contact function directly into the terminal body structure. The terminal includes a terminal body with a contact surface that directly serves as the fixed contact, eliminating the need for separate fixed contact components. This integration reduces the number of parts while maintaining the contact switching function, thereby reducing device complexity and potential failure points.
Solution Approach 2:
The terminal body's contact surface is designed to self-clean through sliding contact. When the movable contact slides against the terminal body's contact surface, oxide layers are mechanically removed, allowing the contact to maintain good electrical conductivity without external cleaning mechanisms. This self-service capability improves reliability without adding complexity.
2Reliability
If separate fixed contact components are used, then contact switching can be implemented, but the vulnerability to conduction failures from oxide layers increases
Solution Approach 1:
The contact surface of the terminal body is designed to be self-cleaning through the sliding action of the movable contact. As the movable contact slides against the terminal body's contact surface during operation, oxide layers are mechanically scraped off, maintaining good electrical conductivity. This self-service mechanism continuously removes harmful oxide layers without external intervention.
Solution Approach 2:
The patent changes the surface characteristics of the terminal body's contact surface to enhance its self-cleaning capability. The contact surface is designed with specific friction characteristics that enable effective oxide layer removal during sliding contact, transforming the interaction parameters between the movable contact and fixed contact to favor automatic cleaning.
3Ease of operation
If multiple separate components are used for contacts, then contact switching function is achieved, but the structure becomes more complex
Solution Approach 1:
The patent combines the fixed contact function with the terminal body into a single integrated structure. The terminal body includes a contact surface that directly serves as the fixed contact, eliminating the need for separate fixed contact components. This merger simplifies the overall structure while maintaining the complete contact switching function, making the device easier to manufacture and assemble.
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
Simplifies the structure by eliminating the need for separate fixed contacts, improves robustness by allowing sliding contact to remove oxide layers, and reduces conduction failure risks, thereby enhancing the reliability and efficiency of contact switching.
Implementation Method 1
a movable terminal (18) having a snap action mechanism (23) that bends a spring (22)
Data Source
AI summary
A switch device includes a movable terminal including a snap action mechanism that bends a spring when a user moves an operating portion, a first fixed terminal that contacts the movable terminal when the spring is not bent, and a second fixed terminal that contacts the movable terminal when the operating portion is moved by a specified amount to bend the spring. The second fixed terminal includes a portion machined into a fixed contact that contacts the movable terminal.