Cover Assembly Locking Mechanism for Electrical Switchgear
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Solution Overview
Problem
Electrical switching apparatuses lack reliable mechanisms to maintain an OFF condition during maintenance or repair, as they can inadvertently switch to an ON condition due to play in locking mechanisms accommodating varying lock sizes, allowing unauthorized access.
Innovation Solution
A cover assembly with a retention device and translatable cover that resists movement to a configuration allowing access, featuring engagement elements and bolt members to accommodate various locking element dimensions, ensuring secure restriction of access to control elements until all locks are removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrical switching apparatus is designed to accommodate large locking devices, then it can accept a variety of locking device sizes, but small locks with small shackles create play within the locking mechanism that may allow limited access
Solution Approach 1:
The patent applies local quality by providing multiple sets of openings (first, second, and third openings) with different sizes and configurations within the same locking mechanism. Each opening is specifically sized to accommodate different shackle dimensions, ensuring a snug fit for both small and large locks without creating play or excessive gap. This localized variation in opening characteristics resolves the contradiction between versatility and security.
Solution Approach 2:
The patent changes the parameter of opening dimensions by providing multiple opening sizes (first openings, second openings, third openings) that can be selectively used based on the locking device size. The system transitions from a single fixed opening size to multiple variable opening sizes, allowing the locking mechanism to adapt its parameters to match the specific locking device being used, thereby maintaining security across different lock types.
2Device complexity
If a single opening size is used in the locking mechanism, then the structure is simple, but it cannot accommodate locking devices of varying dimensions without creating play
Solution Approach 1:
The patent segments the locking mechanism by dividing it into multiple distinct opening sets (first, second, and third openings) rather than using a single unified opening. Each opening set is positioned at different locations and has different dimensional characteristics. This segmentation allows the system to handle various lock sizes effectively while maintaining an relatively simple overall structure that integrates seamlessly into the existing locking mechanism.
3Ease of operation
If the cover can be easily removed for access, then operation is convenient, but security during maintenance is compromised
Solution Approach 1:
The patent applies dynamics by making the cover translatable between different configurations (first and second configurations) based on the presence or absence of locking devices. In the first configuration, the cover provides full access to control elements for normal operation. When locking devices are installed, the cover translates to the second configuration where its position restricts access to control elements. This dynamic repositioning resolves the contradiction between ease of operation and security during maintenance.
Data Source
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AI summary
An improved cover assembly for use with an electrical switching apparatus can be said to comprise a retention device that is structured to be disposed on the electrical switching apparatus and a cover that comprises an engagement element and that is disposed on the retention device. The cover is translatable between a first configuration and a second configuration and is configured such that a locking element will resist movement of the cover toward the second configuration. In the first configuration, the engagement element and the retention device confront one another to resist movement of the cover away from the electrical switching apparatus. However, in the second configuration, the engagement element and the retention device are clear of one another and enable the cover to be pivoted away from the electrical switching apparatus to provide access to the control elements of the switching apparatus.