Elastomeric Electrical Box Cover for Fire and Acoustic Sealing
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Solution Overview
Problem
Existing electrical box covers fail to provide adequate fire and acoustic sealing, are labor-intensive to install, and often require specialized boxes and increased costs due to the need for fasteners, while also compromising usable volume and being prone to removal during maintenance.
Innovation Solution
A soft, flexible electrical box cover made of elastomeric material that can be molded to fit over the box, featuring a flange to cover gaps and knock-outs for conduit passage, providing snug fit and easy installation without reducing the box's interior space, while offering enhanced fire and sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid or plastic covers with fasteners are used to seal electrical boxes, then fire and acoustic sealing is improved, but device complexity and manufacturing cost increase due to alignment holes and fastener requirements
Solution Approach 1:
The patent uses a flexible foam material cover that can be stretched and molded over the electrical box, eliminating the need for rigid structures with alignment holes and fasteners. The flexible material conforms to the box shape and provides sealing through its elastic properties, resolving the contradiction between sealing reliability and structural complexity.
Solution Approach 2:
The patent replaces the mechanical fastening system (holes, bolts, screws) with an elastic retention system. The cover is held in place by the elastic recovery force of the stretched foam material, substituting complex mechanical connections with a simpler elastic attachment mechanism that maintains sealing effectiveness.
2Reliability
If putty pads are used for firestop protection, then fire protection is improved, but installation labor and time increase due to manual shaping requirements
Solution Approach 1:
The cover is pre-formed with the appropriate shape and size before installation, eliminating the need for on-site manual shaping and molding. The pre-fabricated elastic cover can be directly stretched over the box, significantly reducing installation labor and time while maintaining fire protection effectiveness.
3Reliability
If box inserts are used for fire protection, then fire insulation is improved, but usable volume inside the box decreases and acoustic sealing is not provided
Solution Approach 1:
Instead of placing fire protection material inside the box (box inserts), the patent places the fire-resistant foam cover on the exterior of the box. This inversion of the protection approach maintains the full internal volume of the electrical box while providing equivalent fire insulation and additional acoustic sealing benefits.
4Reliability
If box gaskets are used for sealing, then fire and acoustic sealing is improved, but the gaskets can be inadvertently removed during faceplate changes
Solution Approach 1:
The elastic cover utilizes continuous curved elastic force distributed around the entire box perimeter, creating a uniform retaining pressure that resists removal. This distributed elastic retention is more difficult to accidentally disengage compared to localized gasket connections, improving installation stability while maintaining sealing effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The flexible box cover ensures effective fire and sound sealing, reduces labor and costs, and prevents accidental removal, meeting building codes for fire and acoustic ratings without compromising the box's functionality.
Implementation Method 1
The box cover is made of a soft, flexible material that can be molded to the shape of the electrical outlet box and that has certain elastomeric qualities such that the box cover can be slipped on to the electrical outlet box easily and stay snugly fit
Data Source
AI summary
An electrical box cover for an electrical outlet box includes a back and four sides extending from the back. The back and the four sides define an interior of the box cover that is large enough to cover the exterior of the electrical outlet box. The box cover is made of a soft, flexible material that can be molded to a shape of the electrical outlet box and that has certain elastomeric qualities so that the box cover can be slipped on to the electrical outlet box and installed, thereby providing additional sound and fire protection to the electrical outlet box. The cover box may also include a flange surrounding the opening in the box cover to cover any gaps around the cutout of the wall. The box cover may include one or more knock-outs that correspond to one or more knock-outs in the electrical outlet box.