Junction Box Cover Plate for Post-Plastering Lighting Access
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Solution Overview
Problem
Existing junction box systems for lighting in flammable structures require pre-installation of electrical wiring and are aesthetically limiting due to visible backplates, and they do not allow for post-plastering installation or easy access to electrical connections as per North-American regulations.
Innovation Solution
A system featuring a housing with an open front side, a lath cover with a pattern of holes, and a cover plate that allows for concealed installation and access to the power supply without breaking structural parts, enabling flexible fitting and mounting of lighting elements before or after plastering, with adaptable openings for power supply and mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a single perforated lath cover is used to conceal the junction box in plaster, then the installation is aesthetically improved and the box is concealed, but the electrical connections become inaccessible and plaster/ screws can penetrate into the box
Solution Approach 1:
The system divides the covering structure into two separate components: a cover plate that provides access to electrical connections and a lath cover with hole pattern that conceals the installation. This segmentation allows each component to fulfill its specific function without compromising the other - the cover plate can be removed for electrical access while the lath cover remains in place for aesthetic concealment.
Solution Approach 2:
The cover plate acts as an intermediary element between the junction box and the lath cover. It provides a protective barrier that prevents plaster and screws from penetrating into the electrical box while maintaining access to electrical connections. The intermediary structure resolves the conflict between concealment and accessibility.
2Ease of manufacture
If electrical wiring is installed in the junction box before plastering, then the installation process is simplified, but no additional installation work can be performed after plastering
Solution Approach 1:
The system allows preliminary installation of the housing and cover plate structure before plastering, while reserving the capability for subsequent wiring installation through the accessible cover plate design. The cover plate with its opening pattern enables electrical connections to be made after plastering without requiring removal of structural elements.
3Ease of operation
If the backplate is mounted on top of the plaster, then the electrical connections are accessible, but the backplate becomes visible and the design is compromised
Solution Approach 1:
The system separates the functional backplate (cover plate) from the aesthetic lath cover. The cover plate remains visible but is designed with an appealing hole pattern that complements the lath cover's aesthetic function. This segmentation allows the electrical access function to be fulfilled without compromising the overall aesthetic appearance, as both components work together as a coordinated design element.
4Object-affected harmful factors
If a cover plate completely covers the junction box, then plaster is prevented from entering, but the lighting device mounting surface is reduced
Solution Approach 1:
The cover plate is designed with specific opening patterns that provide localized protection where needed (around the electrical connections and housing edges) while maintaining open areas for lighting device mounting. This local quality approach ensures plaster prevention without sacrificing mounting surface area, as the protective function is concentrated in critical areas rather than requiring complete coverage.
Data Source
AI summary
A system for fitting and electrically connecting lighting elements, including at least one junction box accommodated in a wall (11), the junction box having a housing (12) provided with an open front side parallel to the wall and with a power supply (15) therein, and a lath cover (2) with a pattern of holes (3) which is coupled to the front side of the housing in order to conceal the junction box in the wall, with a cover plate (1) being provided between the housing (12) and the lath cover (2).