Magnetic Cover Plate Shims for Screwless Box Alignment

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Solution Overview

Problem

Conventional cover plates for electrical boxes are difficult to remove and install, require visible screws, and can be aesthetically unpleasing due to exposed screw heads, especially when the underlying electrical box is misaligned.

Innovation Solution

A magnetic cover plate mounting assembly using shims with integrated magnets that securely attach to the electrical box and cover plate without screws, allowing easy installation and removal without tools, and adjusting for misalignments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional screw-based cover plates are used, then secure attachment is achieved, but visible screw holes and exposed screw heads create aesthetic issues

Engineering Contradiction:

Improveaesthetic appearanceVSAvoidscrew holes and visible screw heads

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The invention extracts and removes the screws and screw holes from the cover plate assembly entirely. Instead of using traditional screw-based attachment, the patent employs a snap-fit mechanism where the cover plate directly engages with the electrical box through complementary geometric features, eliminating the need for visible fasteners and holes.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical screw-fastening system with a snap-fit engagement system. The cover plate includes engagement features that mate with corresponding features on the electrical box, creating a secure attachment through elastic deformation and geometric interlocking rather than threaded fasteners.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If screws are used to attach the cover plate, then secure attachment is achieved, but installation and removal require tools and are difficult

Engineering Contradiction:

Improveinstallation and removal easeVSAvoidattachment security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent replaces the screw-based mechanical fastening system with a snap-fit engagement system. The cover plate includes engagement features that mate with corresponding features on the electrical box, creating a secure attachment through elastic deformation and geometric interlocking rather than threaded fasteners.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The snap-fit mechanism is designed to be self-aligning and self-securing. The elastic engagement features automatically adjust to accommodate minor misalignments and maintain constant contact pressure, eliminating the need for tools or additional fastening operations during installation or removal.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If the electrical box is misaligned, then installation flexibility is maintained, but the cover plate appears skewed and aesthetically unpleasing

Engineering Contradiction:

Improveaccommodation of misalignmentVSAvoidcover plate alignment

Core Design Contradiction:

Adaptability or versatilityVSShape

Solution Approach 1:

The patent introduces dynamic adjustment capabilities through compliant engagement features and adjustable mounting mechanisms. The cover plate assembly includes elements that can flex, rotate, or adjust their position to accommodate misaligned electrical boxes while maintaining a straight, aligned appearance on the wall surface.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent divides the cover plate assembly into separate functional segments: a fixed alignment portion that maintains aesthetic appearance, and an adjustable portion that accommodates the misaligned electrical box. This segmentation allows the cover plate to appear straight while adapting to the underlying misalignment.

Inventive Principle:

Principle #1Segmentation

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 magnetic attachment provides a secure, tool-free installation that hides screw holes, enhances aesthetics, and aligns the cover plate with the installation surface despite misalignments.

Implementation Method 1

A magnetic cover plate mounting assembly may be provided. The magnetic cover plate mounting assembly may comprise a first magnetic shim configured to be positioned between an electrical box and an electrical assembly.

Methodology Applied

Scientific EffectMagnetic attachment: Magnetism

Implementation Method 2

The first magnetic shim may comprise a spring cleat having a compressed state and an uncompressed state and configured to engage a rim of the magnetic cover plate assembly. The spring cleat may inhibit decoupling of the magnetic cover plate assembly from the first magnetic shim after the magnetic cover plate assembly is coupled with the first magnetic shim.

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12489282B1Electrical box assembly having shims securing a cover plate

Publication Date: 2025.12.02 CRAVEN JOSEPH POWELL

AI summary

A magnetic cover plate mounting assembly may comprise a magnetic cover plate assembly and one or more magnetic shims. The one or more magnetic shims may include a first magnetic shim with a first recessed area and a second magnetic shim defining a second recessed area and may be positioned between an electrical box and an electrical assembly. A number of magnets may be placed within the first and the second recessed areas. A magnetic cover plate assembly may additionally be provided and may be coupled to the magnetic shims. The magnetic cover plate assembly may have a screwless front surface.