US 4,689,440 AGranted

Gas pressurizable coaxial cables and cable termination fitting assemblies

AssigneeNorthern Telecom Limited

InventorJ. O. R. Morin

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Abstract

A gas pressurizable coaxial cable and termination fitting assembly in which a shroud means of the fitting is sealed to the jacket and extends beyond the jacket end to surround an end portion of a coaxial conductor assembly. The termination fitting also includes an annular dielectric plug which concentrically surrounds the inner conductor. The plug is resiliently compressible to seal against the inner conductor under a radial pressure exerted upon the plug and to release itself when the pressure is removed. A holding device is detachably mounted to hold the plug in a sealing position and also to form an airtight seal with the shroud means. The holding device engages one axial side of the plug to compress it against an abutment surface and opposing radial surfaces of the plug and device also apply a radial pressure to the plug.

Claims13

Dependent claims

A gas pressurizable coaxial cable and cable termination fitting assembly comprising:

(a) a cable with a core incorporating a coaxial conductor assembly in which an inner conductor and an outer conductor are provided, the outer conductor electrically isolated from and concentrically spaced around the inner conductor to define an annular air space between the conductors of the conductor assembly, a jacket surrounding the core with the said coaxial conductor assembly having an end portion extending axially beyond one end of the jacket at one end of the cable;
(b) a cable termination fitting located at said one end of the cable, the fitting comprising:-
(i) an outer conductor shroud means sealed to the jacket and extending axially beyond said jacket and surrounding the end portion of the coaxial conductor assembly;
and
(ii) an annular dielectric plug concentrically surrounding the inner conductor, the plug being resiliently compressible to seal against the inner conductor under a radial pressure upon the plug and to release itself from the inner conductor upon removal of the radial pressure, and means for holding the plug in a sealing position, said holding means detachably mounted upon and forming an airtight seal with the shroud means and engaging an axial side of the plug for urging the plug axially against an abutment surface, the plug and the holding means having opposing surfaces which are disposed to cause the holding means to apply radial pressure against the plug and compress the plug sealingly against the inner conductor.

2 more elements

A method of attaching a cable termination fitting to a gas pressurizable coaxial cable having a jacket and a core comprising at least one coaxial conductor assembly in which an inner conductor is surrounded by an outer conductor comprising:

removing jacket material at one end of the cable to expose an end portion of the at least one coaxial conductor assembly, said end portion extending axially beyond the end of the jacket;
attaching an outer conductor shroud means of the fitting sealingly to the jacket with the shroud means extending axially beyond the jacket and surrounding said end portion of the at least one coaxial conductor assembly;
locating an annular plug concentrically around the inner conductor and axially facing an abutment surface, the plug being resilient to radially inward compression under a radial pressure so as to return substantially to its uncompressed condition when the pressure is removed;
detachably mounting a plug holding means to the shroud means to urge the plug against the abutment surface;
and
applying a radial pressure to the plug during mounting of the holding means so as to compress the plug radially inwards and cause it to apply sealing pressure against the inner conductor.

3 more elements

Dependencies are inferred from the claim text.