Dual-Circuit Switch Contact Structure for Reliable Simultaneous Switching
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Solution Overview
Problem
Existing switch devices require a plunger to press four contacts, leading to a complex structure and potential poor contact pressing, as seen in U.S. Pat. No. 4,931,605.
Innovation Solution
A switch device with a housing, movable contact members, an elastic arm, and a drive body mechanism that allows simultaneous switching of two systems with a simpler configuration by pressing a pair of support legs and a drive body to connect central fixed contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a plunger is used to press two contacts per contact member, then simultaneous switching of two systems is achieved, but the structure becomes complex and contact pressing reliability deteriorates
Solution Approach 1:
The patent combines the functions of pressing multiple contacts into a single integrated movable contact member with multiple contact portions, rather than using separate plungers for each contact. This merging approach achieves simultaneous switching while reducing structural complexity
Solution Approach 2:
The movable contact member serves multiple functions: it simultaneously contacts multiple fixed contacts, provides elastic pressing force through its arm portion, and enables switching for multiple systems. This multi-functionality eliminates the need for separate pressing mechanisms
2Extent of automation
If a plunger is used to press four contacts, then switching function is achieved, but contact pressing reliability deteriorates due to poor contact pressure distribution
Solution Approach 1:
The movable contact member has different structural characteristics at different locations: the arm portion provides elastic compliance for reliable contact pressure, while the contact portions are positioned to optimize local contact quality. This local differentiation ensures reliable contact pressing across all contact points
Solution Approach 2:
The movable contact member utilizes elastic deformation of its arm portion to dynamically adapt contact pressure to the specific characteristics of each fixed contact, ensuring reliable electrical connection rather than relying on rigid mechanical pressing
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 device ensures reliable and simultaneous switching of two systems with a simpler structure, providing stable contact maintenance and reduced wear on peripheral fixed contacts, while offering a click sensation and improved durability.
Implementation Method 1
a plate spring provided below the operation member in the accommodation portion and pressed by the operation member
Implementation Method 2
an elastic arm portion extending from a central portion of the base portion and capable of releasably connecting the central fixed contact
Data Source
AI summary
A switch device includes a housing having an accommodation portion, a peripheral fixed contact and a central fixed contact provided at a bottom of the accommodation portion, a movable contact member including a base portion on the bottom of the accommodation portion and in contact with the peripheral fixed contact, an elastic arm extending from a central portion of the base portion and capable of releasably connecting the central fixed contact, and a pair of support legs extending from both ends of the base portion, an operation member on which an operator performs a push-down operation, a plate spring provided below the operation member in the accommodation portion and pressed by the operation member, and a drive body provided above the elastic arm and below the plate spring, causing the elastic arm to contact the central fixed contact by pressed by the plate spring and pushing down the elastic arm.