Electricity: conductors and insulators – Boxes and housings – With electrical device
Patent
1976-05-17
1978-05-02
Truhe, J. V.
Electricity: conductors and insulators
Boxes and housings
With electrical device
169 48, 220 88A, A62C 316
Patent
active
040876241
ABSTRACT:
A fire shield device for use with an electrical box mounted in an opening in a building wall for inhibiting fire in the box from reaching the walls surrounding the opening. The device is formed of fire-resistant material, such as metal or fire-resistant plastic, and comprises opposite side and end walls which define a rectangle and which are adapted to fit snugly within the box.A substantially continuous, outwardly extending peripheral flange is joined to the walls and is adapted to engage the outer surface of the building wall surrounding the opening. The walls of the device have spaced, peripherally extending grooves formed therein parallel with the edges for breaking away predetermined peripherally extending segments of the walls thereby to selectively shorten the height of the walls so as to accommodate the device to a particular box and building wall thickness. At least two opposite ones of the walls of the device may have means thereon for adjusting the length thereof, and the walls of the device may also have means thereon for breaking-away the corners defined by the walls thereby to accommodate the device to the interior of a particular box. Two opposite ones of the walls of the device may further have means thereon for breaking-away further selected segments parallel with the edges and intermediate the corners for accommodating switch or outlet-mounting lugs on the box. Two opposite ones of the flanges may have means thereon for breaking-away segments thereof to define relatively narrow, transversely extending slots intermediate the ends of the flanges for accommodating the screws which are used to secure a cover plate to a convenience outlet or switch which is mounted in the box.
REFERENCES:
patent: 915381 (1909-03-01), Pullets
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patent: 2378861 (1945-06-01), Peevey
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patent: 2989206 (1961-06-01), McAfee
patent: 3115265 (1963-12-01), Mulkey
patent: 3530230 (1970-09-01), Cormier
patent: 3614144 (1971-10-01), Hodges
patent: 3620404 (1971-11-01), Grasso
patent: 3651245 (1972-03-01), Moll
patent: 3720783 (1973-03-01), Moll
Tone David A.
Truhe J. V.
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