Integrated Rotor Cam for Electrical Switch Safety
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Solution Overview
Problem
Electrical switches designed for large currents are complex and costly due to the need for mechanisms that prevent partial opening or closing, which can lead to arcing and fire hazards.
Innovation Solution
A single rotor cam with multiple interfaces (rotor, handle, and spring arm) is used to simplify the switch design, allowing independent rotation of the handle before engaging the rotor, thus eliminating the need for separate cams and springs, reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate mechanisms (cams and springs) are used to prevent partial switching, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple separate mechanisms (handle cam, spring cam, and rotor cam) into a single integrated rotor cam component. This unified component performs all three functions: receiving handle input, providing spring bias, and controlling rotor rotation. The merging eliminates the need for multiple separate parts while maintaining the safety functions, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The rotor cam is designed as a multi-functional component that simultaneously serves as the handle cam, spring cam, and rotor cam. It features multiple interfaces that allow it to interact with the handle, spring arm, and rotor respectively. This universal design allows one component to perform the work of three separate components, reducing complexity while preserving all safety functions.
2Reliability
If multiple separate mechanisms are used to ensure complete switching, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
By merging multiple cam mechanisms into a single rotor cam, the patent reduces the number of parts that need to be manufactured, assembled, and quality-checked. Fewer parts mean lower manufacturing costs while the integrated design maintains all necessary safety functions through its multiple interfaces.
Solution Approach 2:
The universal rotor cam performs multiple functions in one component, reducing the total part count and associated manufacturing costs. The single component approach simplifies production while maintaining reliability through its multi-interface design that ensures complete switching.
3Device complexity
If a single integrated rotor cam is used, then device complexity is reduced, but the requirement for precise interface design increases
Solution Approach 1:
The rotor cam is segmented into distinct functional interfaces (handle interface, spring arm interface, and rotor interface) with specific features at each interface. This segmentation allows for standardized, precision-manufactured connection points while keeping the overall design simple. Each interface can be designed and manufactured independently with precise tolerances.
Solution Approach 2:
Different regions of the rotor cam have different local qualities and features tailored to their specific functions. The handle interface has features optimized for handle coupling, the spring arm interface has features for spring engagement, and the rotor interface has features for rotor connection. This localized optimization allows precise manufacturing at each interface while maintaining overall simplicity.
Data Source
AI summary
An apparatus for an electrical switch that includes a rotor cam having a rotor interface, a handle interface, and a spring arm interface. The rotor interface includes a plurality of side interface features that couple the rotor cam to a rotor of the electrical switch so that rotation of the rotor cam causes rotation of the rotor. The handle interface allows coupling of the rotor cam to a handle, wherein the handle interface is sized so as to allow a predetermined amount of independent rotation of the handle relative to the rotor cam before further rotation of the handle causes rotation of the rotor cam. The spring arm interface couples a spring arm of the electrical switch to the rotor cam so that a bias spring of the spring arm biases the spring arm against the rotor cam. Numerous other embodiments are provided.