Open Back Junction Box with Integral Ground Screw
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Solution Overview
Problem
Existing prefabricated junction box assemblies require complex and time-consuming wiring processes due to the need for ground clips, which cause interference with other elements and complicate the installation of fire putty pads, and result in increased costs and re-work.
Innovation Solution
A bracket and open back junction box assembly with a detachable rear cover plate, integral threaded ground screw receptacle, and lipless design that allows for simplified wiring at a prefab facility and easy access at the construction site, eliminating the need for ground clips and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ground clips are used in traditional junction box assemblies, then grounding connection is achieved, but interference with other elements (plaster rings, fittings) occurs and installation complexity increases
Solution Approach 1:
The patent removes the ground clip component entirely from the junction box assembly and replaces it with an integral threaded ground screw receptacle built into the junction box structure itself. This extraction of the problematic ground clip element eliminates the interference issues with plaster rings and fittings while maintaining reliable grounding through the integrated screw receptacle design.
Solution Approach 2:
The grounding function is merged directly into the junction box structure by incorporating a threaded ground screw receptacle as an integral part of the junction box. This combines the grounding function with the structural element, eliminating the need for separate ground clips and reducing overall assembly complexity.
2Reliability
If ground clips are used in traditional junction box assemblies, then grounding is established, but manufacturing costs and re-work increase
Solution Approach 1:
The grounding function is merged into the junction box manufacturing process itself, with the threaded ground screw receptacle being formed as an integral part of the junction box during production. This eliminates the need for separate ground clip components and their associated manufacturing, inventory, and installation costs.
Solution Approach 2:
The ground screw receptacle is pre-formed and integrated into the junction box during manufacturing, preparing the grounding path in advance. This preliminary action eliminates the need for additional grounding steps and reduces re-work requirements during installation.
3Strength
If closed back junction boxes are used, then structural integrity is maintained, but wiring access and installation efficiency are reduced
Solution Approach 1:
The junction box is segmented into a main body and a separate rear cover, with the rear cover being removable to provide wiring access. This segmentation allows the box to maintain structural integrity when assembled while providing easy access for wiring operations during installation.
Solution Approach 2:
The rear cover is designed to be removable and reattachable, transforming the static closed structure into a dynamic assembly that can open for wiring access and close for structural integrity. This dynamic feature enables efficient wiring installation while maintaining box strength when closed.
Data Source
AI summary
A bracket and open back junction box assembly allows simplified wiring at a construction site. An open back junction box including a detachable and reattachable rear cover plate is pre-assembled with a plaster ring, electrical device, and leads, at a prefab facility. A Metal Clad (MC) cable may be attached to the open back junction box and wires carried in the MC Cable may be connected to the leads. A mounting bracket is generally sandwiched between the open back junction box and the plaster ring for mounting to framing members at the construction site. Following assembly at the prefab facility, the prefab open back junction box is shipped to the construction site where the bracket and open back junction box assembly is mounted to framing members. Connections to wires carried by MC Cables are then facilitated by removing the rear cover plate to access the open back junction box interior.