Electrical Box Cover Assembly with Camming Latch and 180-Degree Hinge
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Solution Overview
Problem
Existing cover assemblies for electrical boxes require tools to open and close, creating inconvenience and tripping hazards, and fail to prevent moisture infiltration, which can damage electrical components.
Innovation Solution
A cover assembly with enlarged hinge links for 180-degree rotation, gasketed side doors, and a camming action latch assembly that allows tool-free operation and seals the cover to prevent fluid and debris ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tool-activated latch is used to secure the cover, then the cover can be retained in the closed position, but the cover requires additional equipment and steps to open
Solution Approach 1:
The cover opening mechanism serves itself by using the cover's own weight and motion to activate the latch release. When the cover is lifted, the camming action automatically disengages the latch without requiring external tools or manual manipulation of separate components.
Solution Approach 2:
The camming mechanism acts as an intermediary between the cover position and the latch state. The cam translates the vertical motion of opening the cover into horizontal motion that releases the latch, mediating the connection between these two functions.
2Ease of operation
If the cover extends upwardly from the base when open, then access to the poke through is permitted, but a tripping hazard is created
Solution Approach 1:
The hinge mechanism enables the cover to rotate from a vertical orientation to a horizontal orientation, changing the dimension in which the cover extends. This allows the cover to provide access while lying flat in the open position, eliminating the tripping hazard associated with vertically extending covers.
3Object-affected harmful factors
If the cover assembly is designed with low profile to avoid tripping hazards, then safety is improved, but access to electrical components is restricted when cover is closed
Solution Approach 1:
The cover assembly transitions from a static low-profile closed position to a dynamic open position where the cover rotates to provide access. The hinge mechanism enables this dynamic transformation, allowing the assembly to maintain a low profile when closed for safety while providing full access when opened.
4Ease of operation
If the cover is made accessible without tools, then ease of operation is improved, but the latch mechanism becomes more complex
Solution Approach 1:
The camming mechanism changes the geometric parameters of the latch engagement. As the cover opens, the cam profile transforms the engagement geometry, converting the latch from a secured state to a released state through controlled geometric transformation rather than complex mechanical actuation.
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
Enables easy access to electrical components without tools, reduces tripping hazards, and effectively seals the electrical box to protect against moisture and debris.
Implementation Method 1
enlarged links to achieve a 180 degree rotation of the cover
Implementation Method 2
gasketed side doors to resist contamination of the electrical outlets below the cover
Implementation Method 3
camming action latch assembly that simplifies locking and unlocking of the cover
Data Source
AI summary
A cover assembly for an electrical box, such as a fire-rated poke through, includes a frame defining an opening, the frame including a first frame location and a second frame location, the first frame location being substantially opposite the second frame location, a cover movable between a closed position over the opening and an open position away from the opening, the cover having a perimeter including a proximal end and a distal end, the proximal end being substantially opposite the distal end, and a hinge attaching the cover to the rear frame portion, the hinge having two substantially parallel pivot axes, at least one of which is movable towards and away from the other, one pivot axis located at the first frame location and the other pivot axis located at the proximal end of the cover. This construction provides a cover assembly for an electrical box that allows ready access to utility interfaces within the box, while preventing unwanted fluid and debris from damaging the junction box or utility interfaces below the cover assembly.