Electrical Switch Contact Mating Angle for Debris Removal
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Solution Overview
Problem
Conventional electrical switches experience performance degradation due to debris buildup on contacts, especially in low current load or unclean environments, leading to reduced effectiveness over time.
Innovation Solution
An electrical switch design featuring a rocker arm with angled movable contacts that scrape debris when pivoted, utilizing barriers to control pivot range and a spring-loaded lever to maintain constant contact, ensuring effective engagement and separation of contacts to facilitate electrical current flow while removing contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contacts are engaged at a conventional angle, then electrical connection is established, but debris accumulates on contact surfaces over time
Solution Approach 1:
The patent changes the engagement angle parameter of the movable contact relative to the fixed contact from a conventional perpendicular or shallow angle to a specific angled configuration (approximately 45 degrees). This parameter change enables the contact surfaces to scrape against each other during engagement, effectively removing debris while maintaining reliable electrical connection.
2Ease of operation
If the rocker arm pivot range is unrestricted, then the lever can move freely, but the contact engagement angle cannot be controlled optimally for debris removal
Solution Approach 1:
The rocker arm is segmented into distinct functional zones: a first portion that engages the lever and a second portion that contacts the fixed contact. This segmentation allows independent optimization of each zone's function, enabling the lever to move freely while the second portion maintains the precise engagement angle needed for effective debris removal.
Solution Approach 2:
The rocker arm is pre-configured with a specific geometric angle between its first and second portions before assembly. This preliminary angular configuration ensures that when the lever is actuated, the movable contact automatically engages the fixed contact at the optimal scraping angle, eliminating the need for complex real-time angle control mechanisms.
3Device complexity
If the movable contact is directly connected to the lever, then the structure is simple, but the contact cannot be maintained at the optimal angle for debris elimination
Solution Approach 1:
The rocker arm serves as an intermediary element between the lever and the movable contact. It translates the lever's motion into the specific angular engagement needed for effective contact, maintaining structural simplicity while ensuring reliable debris-free engagement through its geometric configuration.
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 solution effectively eliminates debris from contact surfaces by engaging contacts at an angle, enhancing electrical connection reliability and maintaining performance over time, even in unclean environments.
Implementation Method 1
the frictional forces upon separation cause a scraping of the contact surfaces which eliminates any debris or contaminants present on the contact surfaces
Data Source
AI summary
An electrical switch having a housing with a support member, a rocker arm pivotally coupled to the support member for movement about an axis A, a first terminal coupled to the housing, and a lever pivotally coupled to the housing for pivotal movement about an axis B. The rocker arm includes a first member located on a first side of the pivot axis A, a second member on a second side of the pivot axis A, and a first movable contact coupled to the first member. The lever is pivoted in a first direction to engage the first member on the rocker arm to move the first movable contact away from the first terminal contact to scrape debris from the first movable contact and the first terminal contact. The lever is pivoted in a second direction to engage the second member on the rocker arm to move the first movable contact into a sliding engagement with the first terminal contact.