Cassette Matrix Fastener Inversion for Compact Switchgear
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Solution Overview
Problem
Electrical switching apparatus cassettes with fasteners extending outwardly from lateral sides pose challenges when multiple cassettes are stacked or placed adjacent to each other, as they are difficult to access and require extra space, necessitating the removal of enclosed switching apparatuses for repair.
Innovation Solution
A cassette matrix design where cassettes are disposed immediately adjacent to each other with no fasteners between them, utilizing threshold mounting fasteners that do not extend beyond the lateral sidewall plane, allowing all attachment hardware to be accessed from within the enclosed space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fasteners extend through lateral sidewalls of cassettes, then components can be securely attached to the cassette structure, but adjacent cassettes cannot be placed immediately next to each other and fasteners become difficult to access for repair
Solution Approach 1:
Instead of extending fasteners outward from the lateral sidewalls, the patent inverts the fastener configuration by placing fastener heads on the inner surface of the lateral sidewalls with shafts extending inward into the enclosed space. This allows adjacent cassettes to be placed immediately next to each other while maintaining secure attachment of components and enabling easy access to fasteners for repair without removing enclosed apparatus.
2Strength
If fasteners extend outwardly from lateral sidewalls, then components are firmly secured, but extra space is required between adjacent cassettes preventing immediate adjacency
Solution Approach 1:
The patent inverts the conventional fastener orientation by positioning fastener heads on the inner surface of lateral sidewalls rather than extending them outward. This inversion eliminates the need for extra space between adjacent cassettes, allowing them to be placed immediately next to each other while still providing firm securing of components through the inward-extending fastener shafts that engage with mounting tabs or directly with the cassette structure.
3Ease of manufacture
If traditional fastener configuration is used, then simple construction is achieved, but repair requires removal of enclosed electrical switching apparatuses
Solution Approach 1:
The patent inverts the fastener accessibility by placing fastener heads on the inner surface of lateral sidewalls within the enclosed space, making them accessible for repair without requiring removal of enclosed electrical switching apparatus. The construction remains simple as the fastener configuration follows a straightforward design pattern, just oriented in the opposite direction from conventional approaches.
Data Source
AI summary
A cassette matrix having a first cassette and a second cassette disposed immediately adjacent to each other is provided. The outer sides of the cassettes are in contact and there are no fastener components, such as, but not limited to, a bolt head or nut, disposed between adjacent sidewalls. In this configuration, the cassette matrix requires a reduced amount of space within a larger housing assembly. Each cassette utilizes threshold mounting fasteners to coupled any components to the lateral sidewall. A threshold mounting fastener does not extend outwardly beyond the general plane of the lateral sidewall.