Enclosure Locking Assembly with Segmented Bar Members
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Solution Overview
Problem
Metal enclosures for switchgear face challenges with locking mechanisms that are difficult to align, time-consuming to operate, pose safety risks due to sharp projections, and are prone to mechanical failures from rusting, failing to adequately withstand internal arc forces and gas release.
Innovation Solution
A locking mechanism comprising translational bar members with projections that engage with corresponding blocks around the enclosure opening, actuated by a handle or motor, ensuring secure closure and safe gas release during arcs without sharp projections and minimizing mechanical failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional locking mechanisms are used with multiple locking components, then the door can be securely locked, but the locking and unlocking process becomes extremely time-consuming and difficult to align
Solution Approach 1:
The locking mechanism is segmented into multiple independent bar members (typically three) that can be individually actuated. Each bar member has its own projection that engages with a corresponding block, allowing the locking force to be distributed across multiple segments while maintaining a simple, quick operation mechanism for each segment.
Solution Approach 2:
The bar members are designed to be translatable between locked and unlocked positions through a simple actuating motion. The dynamic translation of each bar member along its axis allows the operator to quickly move between locked and unlocked states without complex alignment procedures, transforming a static complex mechanism into a dynamic simple one.
2Reliability
If traditional locking mechanisms with multiple components are used, then the door can be locked securely, but the mechanism becomes complex and prone to mechanical failures from rusting
Solution Approach 1:
Multiple locking functions are merged into a single integrated mechanism. The bar member combines the functions of a locking bar, a lever, and an alignment guide into one component. The projection on the bar member integrates the locking engagement feature with the actuation mechanism, eliminating the need for separate components and reducing overall system complexity.
Solution Approach 2:
The bar member serves multiple functions simultaneously: it provides the locking force, guides its own alignment through the translation path, engages with the block through the projection, and can be actuated by a simple mechanism. This multi-functionality reduces the total number of components needed while maintaining secure locking capability.
3Reliability
If traditional locking mechanisms are used, then the door can be locked, but sharp projections extend around the door that can injure workers when the door is open
Solution Approach 1:
The harmful sharp projections are extracted and removed from the design. Instead of having sharp edges or protruding elements on the bar members, the invention uses rounded or blunt projections that engage with corresponding recesses or blocks. The locking function is maintained through the geometric engagement of these non-sharp features, eliminating the safety hazard while preserving the mechanical locking capability.
4Ease of operation
If a simple locking mechanism is used, then the operation is quick and easy, but it cannot withstand the tremendous forces generated by internal arcs
Solution Approach 1:
The locking strength is segmented across multiple bar members that distribute the arc force load. Each bar member independently engages with a corresponding block, creating multiple parallel load paths. This segmentation allows the mechanism to withstand tremendous forces through collective strength while each individual component remains simple and easy to actuate.
Solution Approach 2:
The locking mechanism uses composite structural design combining the bar member, projection, and block into an integrated assembly that leverages the strength of each component. The bar member material and geometry are optimized to withstand arc forces, while the projection-block interface provides robust engagement. This composite approach achieves high strength without increasing operational complexity.
Data Source
AI summary
Enclosure comprises a plurality of bar members translatably attached to an interior surface of the door of the enclosure. Each of the plurality of bar members comprises a projection. A plurality of blocks are disposed on a peripheral edge of the opening of the enclosure's body, such that there is a corresponding block for each projection, and wherein each of the plurality of blocks define a channel for receiving and engaging its corresponding projection. When actuated in a first member, an actuator causes each of the plurality of bar members to translate between a first position and a second position. When the door is in a closed position, translation of the bar members to the first position causes each projection to engage with the channel of its corresponding block to thereby hold the door in the closed position. Translation of the plurality of bar members to the second position causes each projection to be translated out of engagement with its corresponding block such that the door can be opened.