Ceiling Fan Mounting Bracket for Heavy-Load Joist Support
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Solution Overview
Problem
Existing mounting assemblies for ceiling fans are inefficient in supporting heavy fans, as they often bend or fail due to the weight being applied proximate to the center of the brace or require long fasteners that limit the total weight the fan can support.
Innovation Solution
A metallic mounting bracket that connects to two perpendicular surfaces of a ceiling joist and engages the perimeter of a ceiling fan box, providing a stable support by securing to both surfaces of the joist and sandwiching the fan box between the ceiling and the joist.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a brace extends between ceiling joists with the fan connected proximate to the center, then the fan can be mounted away from joists, but the weight of the ceiling fan bends the brace and causes failure
Solution Approach 1:
The mounting bracket transitions from a linear brace configuration to a multi-dimensional L-shaped structure that connects to two perpendicular surfaces of the joist (top surface and side surface), distributing the fan weight across multiple attachment points and dimensions rather than relying on a single linear span
Solution Approach 2:
The bracket is divided into multiple sections (first section for fan box engagement, second section for joist surface connection) that can be independently positioned and secured, allowing the weight to be distributed across separate attachment zones rather than concentrated at a single point
2Length of stationary object
If a bracket is connected proximate to the ceiling box using a long fastener, then the distance between box and joist is decreased, but the long fastener still limits the total weight the fan can support
Solution Approach 1:
Instead of using a single long fastener spanning the distance from the ceiling box to the joist, the bracket connects to two perpendicular surfaces of the joist, creating a multi-point attachment system that distributes the load and eliminates the need for excessively long fasteners
Solution Approach 2:
The bracket is designed to engage the ceiling fan box at its lower end before final attachment to the joist, pre-positioning the load path and distributing forces through multiple contact points (opening engagement with box perimeter, second section contact with joist surfaces) rather than relying on a single long fastener
3Strength
If the mounting bracket engages the perimeter of the ceiling fan box, then the weight is distributed more effectively, but the bracket structure becomes more complex
Solution Approach 1:
The bracket's opening serves multiple functions: it engages the perimeter of the ceiling fan box to distribute weight, provides structural support through the L-shaped configuration, and enables attachment to two perpendicular joist surfaces, consolidating multiple functions into a single integrated component
Solution Approach 2:
The bracket is formed from a single piece of metal material that is bent into an L-shape, creating a composite structural form that combines the functions of a mounting plate, support beam, and attachment bracket, reducing the number of separate parts while maintaining structural integrity
Data Source
AI summary
A ceiling fan mounting assembly that includes a ceiling fan box that is positioned at least partially through an opening in a ceiling. The ceiling fan box includes a riser portion that is positioned within the ceiling in use and includes a channel with a partially enclosed perimeter. The ceiling fan mounting assembly also includes a mounting bracket that has a base portion with an opening and a mounting finger that extends away from the base portion. The mounting bracket can connect to the ceiling fan box where the opening extends at least partially around the outer perimeter of the riser portion. The mounting finger is received within the channel and can translate within the channel as the mounting bracket moves relative to the ceiling fan box.