Centered Operating Handle for Two-Pole Circuit Breaker
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Solution Overview
Problem
Conventional two-pole circuit breakers often employ either dual operating handles or a single handle that is not centered, making them appear less robust and complicating the design, especially when trying to maintain a compact and aesthetically appealing form while ensuring effective operation of both poles.
Innovation Solution
A two-pole electrical switching apparatus with a single centered operating handle that uses projections and tapered channels to coordinate the operation of both poles, maintaining a compact and robust appearance while ensuring independent operation of each pole's separable contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single operating handle is used for two-pole circuit breaker, then the device complexity is reduced and appearance is improved, but it becomes difficult to coordinate the operation of both poles effectively
Solution Approach 1:
The single operating handle is segmented into two distinct projections, with each projection independently connected to its respective pole's operating mechanism. This segmentation allows the handle to control both poles while maintaining independent operation pathways, resolving the contradiction between simplified appearance and effective coordination.
Solution Approach 2:
The two projections of the operating handle act as intermediaries between the user's single rotational action and the two separate operating mechanisms. Each projection transfers the rotational motion to its corresponding pole, enabling effective coordination without requiring two separate handles.
2Shape
If a single operating handle is centered between two poles, then the aesthetic appearance and robustness are improved, but the internal mechanism design becomes more complex
Solution Approach 1:
The internal mechanism is segmented into two independent pathways, each connecting one projection of the centered handle to its corresponding pole. This segmentation allows the handle to be centrally positioned for aesthetic purposes while maintaining simple, independent mechanical connections to each pole.
Solution Approach 2:
The symmetric, centered position of the handle is maintained externally for aesthetic purposes, while the internal asymmetric connections to each pole are optimized independently. This allows the external appearance to be robust and centered without compromising the internal mechanism design.
3Ease of operation
If projections and tapered channels are used to connect handle to operating members, then the ease of operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The connection interface uses tapered geometry with specific angular parameters that provide self-aligning and self-centering characteristics during assembly. This parameter selection facilitates ease of operation through smooth rotational motion while accommodating reasonable manufacturing tolerances through the self-aligning nature of the tapered interface.
Data Source
AI summary
An electrical switching apparatus includes an enclosure having an opening, a single operating handle disposed through the enclosure opening, a first pole disposed in the enclosure and including first separable contacts, a first operating mechanism to open and close the first contacts, and a first operating member cooperating with the first operating mechanism to open and close the first contacts. A second pole is disposed in the enclosure and includes second separable contacts, a second operating mechanism to open and close the second contacts, and a second operating member cooperating with the second operating mechanism to open and close the second contacts. The single operating handle, centered between parallel poles, includes a first projection within the enclosure cooperating with the first operating member to open and close the first contacts, and a second projection within the enclosure cooperating with the second operating member to open and close the second contacts.