Two-Piece Electrical Box with Removable Insert Mounting
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Solution Overview
Problem
Existing electrical boxes often become loose over time, posing hazards due to loose wires and electrical shorts, and prior solutions either damage the wall or reduce internal volume by using clamping mechanisms or fastener insert sheaths.
Innovation Solution
A two-piece electrical box design featuring a box member with a channel for a removable insert, allowing secure mounting to framing studs rather than wall coverings, maintaining internal volume for wiring connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If clamping type mechanisms are used to attach the electrical box to the wall covering, then the box can be installed without damaging the wall surface, but the attachment strength is insufficient because wall covering is not structurally strong
Solution Approach 1:
The electrical box is divided into two separate pieces: a box member and an insert. The insert contains the mounting arrangement with fastener insert sheaths that extend through the box member, allowing fasteners to be driven into wall studs rather than clamping onto weak wall covering. This segmentation enables the mounting function to be separated from the enclosure function, resolving the contradiction between ease of installation and attachment strength.
2Strength
If fastener insert sheaths are provided to enable secure mounting to wall studs, then attachment strength is improved, but the internal volume of the box is significantly reduced
Solution Approach 1:
By separating the box into a box member and an insert, the fastener insert sheaths are contained within the insert portion. This allows the box member to maintain its full internal volume for wiring connections while the insert provides the mounting functionality. The segmentation resolves the contradiction by localizing the volume-consuming mounting components to a separate element.
Solution Approach 2:
The insert is inserted into the box member, with the fastener insert sheaths extending through the box member. This nested arrangement allows the mounting arrangement to be housed within the box structure without permanently reducing the usable internal volume, as the insert can be removed if needed and the sheaths provide pathways for fasteners without occupying significant box space.
3Ease of manufacture
If the electrical box is designed as a one-piece molded box with integral fastener receptacles, then manufacturing is simplified, but the internal volume is lost due to the fastener receptacles being internal to the box
Solution Approach 1:
The box is segmented into a box member and an insert that can be manufactured separately and then assembled. The insert contains the fastener insert sheaths and mounting arrangement, while the box member provides the enclosure. This segmentation allows both components to be optimized for their respective functions without compromising internal volume, as the mounting components are external to the box member's internal space.
Data Source
AI summary
A two-piece electrical box including a box member having a channel formed in one sidewall. An insert can be locked into the channel to form an electrical enclosure. The insert includes an internal mounting arrangement for mounting the electrical box in either new work or old work applications. The combined box member and insert with the internal mounting arrangement provides an electrical box having a significantly larger internal volume than prior art one-piece molded electrical boxes.