Unitary Support Rail Assembly for Electrical Switching Apparatus
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Solution Overview
Problem
Current support and extension rail assemblies for electrical switching apparatus housing assemblies are inefficient in load transfer, require multiple separate components for installation and maintenance, and are difficult to actuate while wearing protective gloves, lacking a unified solution for alignment, levering, and lockout functions.
Innovation Solution
A unitary support rail and extension rail assembly with a cast plate-like body incorporating levering mechanism lugs, support rails, and a pivotal mounting system that allows the extension rail to move between three positions, featuring a finger notch for gloved hand operation and protrusions for enhanced load transfer, along with a locking assembly for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If support rails are coupled to housing assembly by multiple fasteners or permanent coupling means, then the coupling strength is improved, but the device complexity increases and additional support plates are required
Solution Approach 1:
The support rail and extension rail are merged into a single unitary support rail assembly that is cast as one piece. This integration eliminates the need for separate fasteners, support plates, and coupling mechanisms, while maintaining structural strength through the monolithic construction. The assembly includes integrated features such as mounting protrusions, rail surfaces, and extension rail mechanisms all formed as a single component.
2Ease of manufacture
If multiple separate components are used for support rail assembly, then the ease of manufacture is improved, but the ease of operation deteriorates when wearing protective gloves
Solution Approach 1:
The support rail and extension rail are merged into a single unitary support rail assembly that is cast as one piece. This integration eliminates the need for separate fasteners, support plates, and coupling mechanisms, while maintaining structural strength through the monolithic construction. The assembly includes integrated features such as mounting protrusions, rail surfaces, and extension rail mechanisms all formed as a single component.
3Ease of manufacture
If rail extensions are separate components not incorporated into housing assembly, then the housing assembly cost is reduced, but the reliability deteriorates as rail extensions may not be available when needed
Solution Approach 1:
The support rail and extension rail are merged into a single unitary support rail assembly that is cast as one piece. This integration eliminates the need for separate fasteners, support plates, and coupling mechanisms, while maintaining structural strength through the monolithic construction. The assembly includes integrated features such as mounting protrusions, rail surfaces, and extension rail mechanisms all formed as a single component.
4Adaptability or versatility
If support rail assembly includes multiple separate components with latches and releases, then the adaptability is improved, but the device complexity increases and operation becomes difficult with gloves
Solution Approach 1:
The support rail and extension rail are merged into a single unitary support rail assembly that is cast as one piece. This integration eliminates the need for separate fasteners, support plates, and coupling mechanisms, while maintaining structural strength through the monolithic construction. The assembly includes integrated features such as mounting protrusions, rail surfaces, and extension rail mechanisms all formed as a single component.
Data Source
Figure 1
Figure 2~2A
Figure 3
AI summary
A housing assembly (10) and a support rail and extension rail assembly (40) for an electrical switching apparatus includes various components. The support rail assembly is, preferably, a cast plate-like body wherein selected components, such as a levering in mechanism lug (66A) and support rails (50A) are formed as part of the casting. The extension rail assembly (80A) includes a generally flat, elongated body having a finger notch (110A) that is sized to accommodate a gloved hand and a mounting slot (94A). The extension rail assembly (80A) is coupled to the support rail assembly (50A) by a pivotal mounting (68A) that extends through the mounting slot (94A). The extension rail further includes a lateral (100) extension. The housing assembly includes an L-shaped cutout (30) having a horizontal portion and a descending vertical portion. When the extension rail is in a storage, or first, position, the lateral extension (100) is disposed in the L-shaped cutout (30).