Adjustable Mounting Lug for Electrical Box Misalignment
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Solution Overview
Problem
Existing electrical boxes lack secure and stable adjustability, particularly for low-depth boxes with large knockouts, leading to misalignment issues and potential thread stripping during device mounting.
Innovation Solution
The design incorporates adjustable mounting lugs with a unique configuration of inclined and curved surfaces, allowing for linear and rotational displacement while maintaining stability, and includes a mounting extension with an offset central axis to accommodate various orientations without interfering with knockout openings or fittings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mounting components have excessive freedom of movement to accommodate misalignment, then ease of installation is improved, but mounting stability deteriorates causing thread stripping
Solution Approach 1:
The mounting lug is designed with dynamic adjustability through inclined sides that allow rotational movement to accommodate misalignment between electrical box mounting holes and wall board holes. The lug can rotate within a controlled range defined by the inclined surfaces, providing adaptive positioning while maintaining secure engagement once aligned.
Solution Approach 2:
The mounting lug geometry incorporates specific incline angles and curved surface radii that define the range and characteristics of rotational movement. By carefully selecting these geometric parameters, the design achieves optimal balance between adjustment capability and mounting stability, preventing excessive play while enabling necessary alignment corrections.
2Adaptability or versatility
If mounting lugs are designed for low-depth boxes with large knockouts, then adaptability is improved, but structural stability deteriorates
Solution Approach 1:
The mounting lug design extends the structural support into the depth dimension by incorporating a back wall with inclined sides that engage with the electrical box interior. This three-dimensional configuration provides anchoring stability despite the limited external depth available in low-depth boxes, distributing loads across multiple surfaces including the back wall and inclined engagement surfaces.
Solution Approach 2:
The curved surface on the mounting lug provides smooth transitional geometry that accommodates the large knockout openings while maintaining structural integrity. The curved profile distributes stress more evenly compared to sharp angles, preventing stress concentration points that would compromise stability in thin-walled low-depth boxes with large openings.
3Ease of operation
If mounting lugs allow rotational displacement to correct misalignment, then ease of operation is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The mounting lug incorporates inclined surfaces that define a controlled rotational range, transforming the rigid fixed-position mounting into a dynamic adjustable system. The incline angles are designed to provide sufficient rotation for alignment correction while naturally limiting the range to prevent over-rotation and maintain engagement stability.
Data Source
AI summary
An adjustable mounting lug for an electrical box that diminishes the degree of play of the adjustable mounting lug relative to at least an orientation of a front face of the electrical box. Sidewalls of the adjustable mounting lug can include a first portion comprising a first segment, and a second portion comprising a first inclined side, an intermediate curved side, and a second inclined side. The second portion can be configured accommodate the adjustable mounting lug having a relatively large height while maintaining at least a minimum length of a bottom wall of the adjustable mounting lug that is supported by a support louvre of the electrical box. The second portion also provides the sidewalls of the larger adjustable mounting lug with a configuration that can prevent the adjustable mounting lug from interfering with at least fittings in the box that can be associated with relatively large knockout openings.