Flexible Junction Box Sealing for Metal Roof Wiring
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Solution Overview
Problem
There is a long-felt need for a junction box that can rest flush atop seams or gaps between roofing shingles or panels while being weatherproof and preventing water ingress, especially where electrical conduits pass through the roof.
Innovation Solution
A junction box design featuring a flexible casing with an outwardly extending shelf and a flexible rim that forms V-shaped channels to create a flush contact with the roof surface, ensuring a watertight seal and accommodating various roof features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid junction box is used for roof installation, then structural strength is improved, but adaptability to different roof configurations deteriorates
Solution Approach 1:
The patent employs a flexible casing made of elastomeric material that can conform to various roof surfaces and configurations. This flexible shell replaces rigid structural elements while maintaining protective functions, allowing the junction box to adapt to different roof types including metal panels, shingles, and tiles without compromising structural integrity.
Solution Approach 2:
The invention utilizes the elastic properties of the elastomeric material to change physical parameters such as shape, flexibility, and conformability. The material can deform to match roof contours and then maintain its shape under operational conditions, providing both adaptability during installation and structural strength during use.
2Reliability
If a fixed rigid seal is used at roof seams, then weatherproofing is improved, but adaptability to roof movements and expansions deteriorates
Solution Approach 1:
The patent implements a dynamic sealing system where the elastomeric material can move and deform with roof expansions, contractions, and movements. The flexible casing maintains continuous contact with the roof surface, creating a reliable weatherproof seal that adapts to changing conditions rather than relying on fixed rigid connections.
Solution Approach 2:
The flexible elastomeric casing acts as a dynamic barrier that moves with the roof structure. This flexible shell maintains its sealing function throughout roof movements and thermal expansions, providing ongoing weatherproofing protection without requiring rigid fixed points.
3Reliability
If a complex flashing system is used to achieve flush contact with roof seams, then weatherproofing is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated flexible casing component. The elastomeric material simultaneously provides sealing, flashing, weatherproofing, and structural protection functions that would traditionally require separate components. This merging eliminates complex multi-part flashing systems while maintaining comprehensive weatherproofing.
Solution Approach 2:
The flexible elastomeric casing replaces complex rigid flashing systems with a single conformable component. The material's ability to mold to roof surfaces and seal around protrusions eliminates the need for multiple flashing pieces, fasteners, and sealing compounds, significantly reducing device complexity.
Data Source
AI summary
A junction box, comprising a housing having an open top and a closed bottom, a cover, arranged to secure to the open top of the housing, a flexible casing having four side members arranged to sealably surround the housing, an outwardly extending shelf fixedly secured to an outside surface of the four side members of the flexible casing, and, a flexible rim fixedly secured to a top surface of the shelf forming a pair of oppositely arranged V-shaped channels on a bottom surface of the shelf.