Assembly for an electrical cable providing strain relief and a w

Details Assembly for an electrical cable providing strain relief and a w Assembly for an electrical cable providing strain relief and a w

1987-11-23

1988-12-06

Grimley, Arthur T.

Electricity: conductors and insulators

Conduits, cables or conductors

Single duct conduits

285 3, 285 39, 411 1, 411410, F16B 3102, H02G 15007

Patent

active

047897597

ABSTRACT:
A fitting for establishing a seal between an insulated electrical cable (70) and an electrical junction box, where the junction box wall has a threaded bore and a profiled through-hole having a camming surface and shoulder. The fitting includes a threaded nut (50) and a ferrule (30) which has tines (34) extending from a ring portion. The ferrule (30) and the nut (50) are slid over the insulated cable (70) and the assembly is brought in registry with the threaded bore (8) of the junction box. Screwing the nut (50) and ferrule (30) forwardly causes the tines (34) on the ferrule (30) to contact the camming surface (12), forcing the tines (34) into the insulation (72) and the insulation (72) into the shoulder (16), thereby establishing a sealed connection. In a further improvement, the nut (50) has first and second wrench-engaging portions (100, 101) formed integrally therewith. The first wrench-engaging portion (100) partially fractures at a predetermined torque level corresponding to more than a desired minimum axial pull-out force on the cable (70). However, the structural integrity of the nut (50) is maintained, such that a wrench (105) may be applied to the second wrench-engaging portion (101) of the nut (50) for removing the nut (50).

REFERENCES:
patent: 3444775 (1969-05-01), Hills
patent: 3485517 (1969-12-01), Howe
patent: 3512447 (1970-05-01), Vaughn
patent: 3567843 (1971-03-01), Collins
patent: 4068555 (1978-01-01), Volkman
patent: 4273405 (1981-06-01), Law
patent: 4387267 (1983-06-01), Becker
patent: 4408936 (1983-10-01), Williamson
patent: 4427326 (1984-01-01), Hobson et al.
patent: 4513172 (1985-04-01), Matsui
patent: 4575274 (1986-03-01), Hayward

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