Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1983-07-29
1986-03-25
Prescott, A. C.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
29432, 174153G, H02G 308
Patent
active
045785287
ABSTRACT:
An electrical outlet box optionally having in combination therewith, a connector fitting for connecting a corrugated conduit to the box, the box having a back wall and at least one side wall of synthetic resin. A pressure removable plug is displaced out of the plane of the side wall so as to provide a precisely delineated zone of weakness surrounding the plug. When one preferred type of connector fitting is used in combination with the box, a wedge-shaped end portion of the fitting, having a relatively small surface area, is manually pressed against the pressure removable plug along a pressure zone immediately radially inwardly from the zone of weakness. This pops the plug out of the wall of the box, leaving a neat, smooth hole into which the connector fitting may be inserted by continued manual pressure applied thereto. The connector fitting includes an expandable cylindrical body portion, and further includes an external circumferential groove at the intersection of the cylindrical body portion with the wedge-shaped end portion. The edge of the wall which defines the opening formed on removal of the plug snaps into this groove to interlock the connector fitting in the wall of the box.
REFERENCES:
patent: 982535 (1911-01-01), Rudkiewicz
patent: 3056852 (1962-10-01), Sachs
patent: 3353701 (1967-11-01), Palmer
patent: 3873759 (1975-03-01), Schindler et al.
patent: 4302035 (1981-11-01), Ochwat
Borsh Richard J.
Pate Harold T.
Ripley Robert W.
Laney William R.
Prescott A. C.
Thyssen-Bornemisza, Inc., (TBG Inc.)
Tone D. A.
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