Nested Switch Contacts for Stable High-Current Engagement
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Solution Overview
Problem
Existing electromechanical switches generate audible noise and oscillations due to repulsive forces during high current surges, degrading contact engagement surfaces and reducing operational lifetimes.
Innovation Solution
An electromechanical switch design with stable engagement interfaces, featuring depressions in the movable contact and protrusions on the stationary contacts that nest together, reducing oscillations and vibrations during high current surges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional flat contact surfaces are used, then the switch structure is simple, but audible noise and oscillations occur during high current surges
Solution Approach 1:
The patent applies nesting by placing a protrusion from one contact into a depression on the opposing contact surface. This nested configuration mechanically stabilizes the contact interface, preventing oscillations and reducing audible noise during high current surges while maintaining structural simplicity
Solution Approach 2:
Instead of using conventional flat contact surfaces, the patent inverts the geometry by creating complementary protrusions and depressions. This inversion transforms the contact interface from a flat surface to a nested configuration that actively resists oscillatory forces
2Ease of manufacture
If conventional flat contact surfaces are used, then manufacturing is simple, but contact engagement surfaces degrade over time
Solution Approach 1:
The nested protrusion-depression configuration distributes mechanical stresses more evenly across the contact interface. This nesting prevents concentrated wear at specific points, thereby extending the operational lifetime of contact surfaces while remaining manufacturable using conventional processes
3Device complexity
If conventional flat contact surfaces are used, then the switch design is simple, but oscillations occur during current surges
Solution Approach 1:
The nested configuration mechanically locks the contact surfaces together, preventing relative oscillatory motion during current surges. The protrusion fitting into the depression creates a stable engagement that resists disruptive forces while adding minimal complexity to the overall design
Solution Approach 2:
The depression and protrusion features introduce curved, non-planar geometry to the contact interface. This curvature creates a mechanically stable engagement that naturally resists oscillations compared to flat surfaces, improving contact stability during electrical surges
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
Eliminates or diminishes audible noise and stabilizes contact engagement, enhancing operational reliability and longevity by minimizing oscillations and vibrations.
Implementation Method 1
featuring depressions in the movable contact and protrusions on the stationary contacts that nest together, reducing oscillations and vibrations during high current surges
Data Source
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AI summary
An electromechanical switch (101) includes first and second stationary contacts (108, 109) and a movable contact (124). Each of the first and second stationary contacts has a respective protrusion (502, 504) at a mating end (306) thereof. The movable contact defines a first depression (308) and a second depression (309) along a mating side (202) thereof. The movable contact is reciprocally movable into and out of a closed position relative to the first and second stationary contacts. In the closed position, the mating side of the movable contact engages the mating ends of the first and second stationary contacts such that the protrusion of the first stationary contact projects into the first depression and the protrusion of the second stationary contact projects into the second depression.