Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1988-03-14
1989-07-04
Grimley, Arthur T.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
174 53, 439539, H02G 306
Patent
active
048453129
ABSTRACT:
An electrical outlet box with attached threaded coupling having a bore entering the box, the bore accomodating either thin wall conduit or cable. A removable gate in an interior wall slot in the box covers the coupling bore and a hole in the gate, smaller than the diameter of the bore, acts as a stop to prevent intrusion of conduit which is secured by a nut threaded on the coupling. When the gate is removed, a cable connector with hex end that snugly fits into the gate slot and is also secured by a threaded nut. Outlets for the box have U-shaped yokes at each end which are pressed into shallow grooves in each interior end wall to secure the outlet in the box, and the box covers have blocks near the sides of the inside surface for engaging the box interior side walls to prevent flexing and breaking.
REFERENCES:
patent: 2740873 (1956-04-01), Cronk
patent: 2927807 (1960-03-01), Campbell
patent: 4211464 (1980-07-01), Lee
patent: 4249789 (1981-02-01), Lee
patent: 4293178 (1981-10-01), Lee
patent: 4324424 (1982-04-01), Woodliff et al.
Castle Linval B.
Grimley Arthur T.
Tone David A.
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