Electric cable with corrugated metallic sheath

Claim 1

An electric cable comprising at least one core including a conductor surrounded throughout its length by at least one layer of insulating material, a corrugated metal sheath surrounding said core, and a tube of solid material intermediate said core and said sheath with the corrugations of said sheath embedded in said tube for preventing slipping of said core and said sheath relative to each other in a direction extending longitudinally of said cable when said cable is suspended by said sheath, said tube being formed by at least one tape made of an insulating material different from that of said layer, deformable by the corrugations of said sheath and having a normal exterior size in the absence of deformation thereof by said corrugations which is greater than the minimum diameter of said corrugations so that portions of said tube at least partially fill said corrugations and said tube encirculing said core and having at least a portion of its interior in frictional engagement with the exterior of said core thereby to provide a tube of tape of solid material between said core and said sheath in frictional engagement with both said sheath and said core which substantially prevents significant relative movement between said core and said sheath longitudinally of said cable when said cable is suspended by said sheath, said material of said tape being softer than the material of said core so as to permit deformation and compression of said tube by said corrugations of said sheath without substantial deformation of said core and said material of said tape also being self-sustaining and resilient and having a shear strength sufficient to prevent said relative movement without shearing thereof.