Electricity: conductors and insulators – Boxes and housings – With grounding means
Patent
1976-04-15
1978-05-16
Truhe, J. V.
Electricity: conductors and insulators
Boxes and housings
With grounding means
174 65SS, 174 78, 285158, 285DIG19, H02G 306
Patent
active
040900290
ABSTRACT:
A liquid tight connector for joining a liquid tight flexible conduit to a junction box or panel and having improved ground continuity is provided. The connector includes a body member having a cast-on lug to which an external ground may be secured. To provide a liquid tight seal between the fitting and the junction box, channel or raceway, an O-ring or similar seal is provided. The O-ring is placed in a recess whose depth and cross section are so related to the size and characteristics of the O-ring, that when the O-ring provides a liquid tight seal, a metallic surface of the body is in contact with the joined metallic member. With this increased metallic contact, there is an improved capacity to conduct fault current. The recess may be positioned to provide substantial contact area on an appropriate side of the perimeter of the O-ring. This protects the contact area from rust and/or corrosion which would reduce the fault current carrying capacity. Serrations, or other means, may be provided to improve the contact between the connector and the joined member and to minimize any tendency to loosen due to vibration. The principles may be adapted to a wide variety of fittings.
REFERENCES:
patent: 2304167 (1942-12-01), Hayes
patent: 2552686 (1951-05-01), Melcher
patent: 2672500 (1954-03-01), Bondon
patent: 2710381 (1955-06-01), Monson
patent: 2727086 (1955-12-01), Madaras
patent: 2821567 (1958-01-01), Bergan
patent: 3009128 (1961-11-01), DeCarlo
patent: 3104120 (1963-09-01), Myers
patent: 3424853 (1969-01-01), Johnson
patent: 3495028 (1970-02-01), Tutthill
patent: 3603912 (1971-09-01), Kelly
patent: 3647934 (1972-03-01), Hurtt
patent: 3915479 (1975-10-01), Sotolongo
General Signal Corporation
Killian George W.
Kleinman Milton E.
Tone D. A.
Truhe J. V.
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