Reinforced Weatherproof Electrical Box for Heavy Ceiling Fans
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Solution Overview
Problem
Existing electrical boxes, particularly those made of plastic, lack sufficient mechanical strength to support the weight and torque of heavy ceiling fans, and creating a weatherproof metal electrical box is complex and expensive.
Innovation Solution
A non-conductive electrical box assembly comprising a molded polymer box and a reinforcement member with standoffs and a shroud, providing mechanical strength and weatherproof sealing to support heavy fixtures like ceiling fans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic electrical boxes are used, then cost and ease of manufacture are improved, but mechanical strength to support heavy fixtures deteriorates
Solution Approach 1:
The patent combines plastic and metal materials in a composite structure where the plastic box provides weatherproofing and corrosion resistance while the metal reinforcement member provides mechanical strength. This composite approach allows the box to support heavy fixtures like ceiling fans while maintaining the manufacturing advantages of plastic construction.
2Strength
If metal electrical boxes are used, then mechanical strength is improved, but complexity of weatherproofing and manufacturing cost increase
Solution Approach 1:
The patent extracts the weatherproofing function from the metal reinforcement member and assigns it to the plastic box, which is inherently more suitable for weatherproofing. The metal reinforcement member focuses solely on providing mechanical strength, while the plastic box handles sealing and environmental protection, simplifying the overall design.
Solution Approach 2:
The patent applies different material properties to different parts of the assembly: the plastic box provides weatherproofing and corrosion resistance where needed, while the metal reinforcement member provides localized mechanical strength at the mounting points. This local quality approach optimizes each component for its specific function.
3Reliability
If plastic electrical boxes are used, then weatherproofing and corrosion resistance are improved, but ability to support heavy fixtures deteriorates
Solution Approach 1:
The patent uses a composite structure where the plastic box maintains weatherproof integrity while the integrated metal reinforcement member provides the necessary support capacity for heavy fixtures. The two materials work together to satisfy both requirements simultaneously.
Solution Approach 2:
The patent segments the electrical box into functional components: the plastic box portion handles weatherproofing and electrical containment, while the metal reinforcement member handles mechanical loading. This segmentation allows each component to be optimized for its specific function.
Data Source
AI summary
The present disclosure provides descriptions of electrical box assemblies for supporting heavy fixtures, such as ceiling fans, and facilitating electrical connections to the fixtures. The electrical box assembly includes an electrical box that allows a connection between the box and electrical conduits and a connection, e.g., a weatherproof connection, with a housing of the fixture. The box has an open front face to house electrical connections between the fixture and wires supplying electrical power to the box via the conduits. The box has a bottom wall and an open front face. A reinforcement member fits within the electrical box and includes a panel shaped to conform to at least a portion of the bottom wall and one or more standoffs extending toward the open front face of the box. When the reinforcement member is positioned within the box, mounting holes in the bottom wall of the box and reinforcement member are aligned to allow the box to be attached to a building structure.