Post-Installation Depth-Adjustable Electrical Box Assembly
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Solution Overview
Problem
Conventional electrical boxes for fans and ceiling fixtures cannot be easily adjusted in depth after initial installation, making it difficult to achieve a flush fit with varying ceiling thicknesses or surfaces.
Innovation Solution
A post-installation depth-adjustable electrical box assembly featuring a depth adjustment screw and a slide plate that allows the box to be adjusted after securing it to a joist, enabling the rim to be aligned flush with the ceiling surface, with a screw retainer maintaining the adjustment screw's axis and allowing up to 1½ inch depth adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional electrical boxes are fastened to a joist before drywall installation, then the box can be securely mounted, but the box cannot be easily adjusted in depth after installation to achieve a flush fit with varying ceiling surfaces
Solution Approach 1:
The electrical box incorporates a dynamic adjustment mechanism with a depth adjustment screw that allows the box to be securely mounted to the joist initially, then easily adjusted in depth afterward. The bracket slides along the joist while being held by mounting screws, and the depth adjustment screw moves the box forward or backward relative to the ceiling surface, providing both secure mounting and post-installation adjustability.
2Adaptability or versatility
If adjustable electrical boxes are designed for initial installation adjustment, then depth adjustment is possible at installation, but no accommodation exists for later adjustment after the ceiling is in place
Solution Approach 1:
The depth adjustment screw serves as an intermediary mechanism that provides adjustment capability at any time after installation. The screw threads engage with the bracket, allowing the user to rotate the screw and move the box forward or backward. This simple intermediary component enables both initial and post-installation adjustment without requiring complex mechanisms or disassembly of the ceiling.
3Manufacturing precision
If the electrical box is fixed at initial installation position, then installation is simple and quick, but the rim cannot be aligned flush with the eventual ceiling surface when drywall thickness varies
Solution Approach 1:
The electrical box allows for parameter changes in depth position after installation. The depth adjustment screw enables the box to be moved forward or backward along the joist, changing its position parameter relative to the ceiling surface. This allows the installer to achieve a flush fit by adjusting the box depth to match the actual drywall thickness, rather than being fixed at a predetermined position.
Data Source
AI summary
A depth-adjustable electrical box assembly for mounting of a fan or fixture on a ceiling including a fan/fixture box and a depth adjustment screw that is always accessible for adjusting the depth of the electrical box with respect to the ceiling. Bracket mounting screws are held captive with the assembly. A slide plate on the fan/fixture box is slideable with respect to the box. A base plate integral with the slide plate includes apertures therein for accepting the bracket mounting screws. A screw retainer, held securely to the fan/fixture box by a bracket, retains the end of the adjustment with respect to the box. Straps on the slide plate provide threaded engagement with the depth adjustment screw and enables the slide plate to slide with respect to the electrical box in response to rotation of the adjustment screw.