Telecommunication cable resistant to water penetration
AssigneesSA des Cableries et Trefileries de Cossonay, Kabelwerke Brugg AG, Societe d'Exploitation des Cables Electriques Systeme Berthoud Borel & Cie
InventorsGerard Chevrolet, Claude Guignard, Maurice Poull
Life of this patent
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Abstract
A cable for telephone or other communication circuits comprises a number of conductor arrays, specifically pairs or quads of helically intertwined conductors, each conductor having a metal core coated with a thermoplastic sheath in which a multiplicity of short cellulose fibers are embedded; the fibers have an average length of about 1 mm and project generally radially from the sheath over the greater part of their length. The fibers of the twisted wires interpenetrate and form a mat in the intervening spaces which swells in the event of water penetration through a defective envelope, thereby limiting the propagation of moisture along the cable.
Claims9
A cable for an electric signaling system, comprising an envelope and a plurality of conductors disposed close to one another in said envelope, each conductor including a metallic core surrounded by a dielectric sheath and a multiplicity of nonconductive fibers partly embedded in said sheath and extending generally radially therefrom, the fibers of adjacent conductors interpenetrating in an intervening space and maintaining the relative position of said conductors in said envelope.
A conductor array for a cable of an electric signaling system, comprising at least one pair of conductors disposed close to one another in said envelope, each conductor including a metallic core surrounded by a dielectric sheath and a multiplicity of nonconductive fibers partly embedded in said sheath and extending generally radially therefrom, the fibers of adjacent conductors interpenetrating in an intervening space and maintaining the relative position of said conductors in said array.
Dependencies are inferred from the claim text.