Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1981-04-27
1983-06-21
Grimley, A. T.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
220 32, 339103R, H02G 308
Patent
active
043895352
ABSTRACT:
An electrical outlet box has electrical power cable entry ports in which one or more closure panels are each mounted adjacent the rim of the aperture along one edge portion only of the panel, the remaining portion of each panel being free and extending substantially across the aperture in a direction angularly inwardly from the plane of the aperture. The closure panels are each either hingedly mounted or sufficiently flexible and resilient so as to be self-opening, such that each free end portion is deflected away from the opening upon passage of the cable into the aperture by manual force, and thereafter resistingly bears against the installed cable. Each panel may be tapered so as to have increased thickness at the base, in which case the panels are self-clamping against removal of the cable from the aperture, and may include supplementary cable gripping projections on their outwardly facing surfaces. The closure panel or panels may also be self-locating and self-adjusting for different cable sizes up to a maximum size equal to the size of the aperture. Access to the box through the cable entry port may be substantially prevented by a frangible closure member, either as a thin web joining the free end of a single closure panel to the wall structure of the box or joining the free ends of two or more panels together, or as a separate conventional knockout panel frangibly interconnected to the rim of the cable entry aperture. The closure panel or panels and outlet box also may be formed as an integral structure.
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Brochure Showing No. 425, "Bush-Grip Connectors", made by Blackhawk Industries, Dubuque, Iowa.
Bowden, Jr. Wade R.
Slater Thomas S.
Grimley A. T.
Slater Electric Inc.
Tone D. A.
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