Electric cable with corrugated sheath and semi-conductive protective layer between the sheath and the core

Claim 2

An electric cable comprising at least one core including a conductor surrounded throughout substantially its length by at least One layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core and a tube comprising solid, at leat semi-conductive material intermediate said core and said sheath and in frictional engagement and electrical contact with said screening layer and said sheath and at least partially filling the corrugations of said sheath to prevent slipping of said core with respect to said sheath and to conductively interconnect said screening layer and said sheath, said tube beings self-sustaining, resilient and softer than the material of said core to permit deformation of said tube by the corrugations of said sheath without substantial deformation of said core and said tube having a shear strength sufficient to prevent said slippage without shearing when said cable is suspended by said sheath.

Claim 3

An electric cable comprising at least one core including a conductor surrounded throughout its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core, and a tube of solid, at least semi-conductive, 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 and for conductively interconnecting said screening layer and said sheath, said tube comprising at least one tape made of an insulating material different from that of said insulating 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 encircling 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 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 longitudinal 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.

Claim 4

An electric cable comprising at least one core including a conductor surrounded throughout its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core, and a tube of solid, at least semi-conductive, 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 and for conductively interconnecting said screening layer and said sheath, said tube comprising at least one tape made of an insulating material different from that of said insulating 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 encircling 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 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 longitudinal 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.

Claim 5

An electric cable comprising at least one core including a conductor surrounded throughout substantially its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core and a tube of semi-conductive tape of crepe paper wound around said screening layer and intermediate said core and said sheath and in frictional engagement and electrical contact with said screening layer and said sheath and at least partially filling the corrugations of said sheath to prevent slipping of said core with respect to said sheath and to conductively interconnect said screening layer and said sheath, said tube being self-sustaining, resilient and softer than the material of said core to permit deformation of said tube by the corrugations of said sheath without substantial deformation of said core and said tube having a shear strength sufficient to prevent said slippage without shearing when said cable is suspended by said sheath

Claim 6

An electric cable comprising at least one core including a conductor surrounded throughout substantially its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core and a tube of semi-conductive tape of crepe paper wound around said screening layer and intermediate said core and said sheath and in frictional engagement and electrical contact with said screening layer and said sheath and at least partially filling the corrugations of said sheath to prevent slipping of said core with respect to said sheath and to conductively interconnect said screening layer and said sheath, said tube being self-sustaining, resilient and softer than the material of said core to permit deformation of said tube by the corrugations of said sheath without substantial deformation of said core and said tube having a shear strength sufficient to prevent said slippage without shearing when said cable is suspended by said sheath

Claim 7

An electric cable comprising at least one core including a conductor surrounded throughout substantially its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core and a tube of semi-conductive tape of crepe paper wound around said screening layer and a further winding of glass fiber cloth containing intercalated metal wires wound around said tape and intermediate said core and said sheath and in frictional engagement and electrical contact with said screening layer and said sheath and at least partially filling the corrugations of said sheath to prevent slipping of said core with respect to said sheath and to conductively interconnect said screening layer and said sheath, said tube being self-sustaining, resilient and softer than the material of said core to permit deformation of said tube by the corrugations of said sheath without substantial deformation of said core and said tube having a shear strength sufficient to prevent said slippage without shearing when said cable is suspended by said sheath.

Claim 8

An electric cable comprising at least one core including a conductor surrounded throughout substantially its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core and a tube of semi-conductive tape of crepe paper wound around said screening layer and a further winding of glass fiber cloth containing intercalated metal wires wound around said tape and intermediate said core and said sheath and in frictional engagement and electrical contact with said screening layer and said sheath and at least partially filling the corrugations of said sheath to prevent slipping of said core with respect to said sheath and to conductively interconnect said screening layer and said sheath, said tube being self-sustaining, resilient and softer than the material of said core to permit deformation of said tube by the corrugations of said sheath without substantial deformation of said core and said tube having a shear strength sufficient to prevent said slippage without shearing when said cable is suspended by said sheath.

Claim 9

An electric cable comprising at least one core including a conductor surrounded throughout its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core, and a tube of solid, at least semi-conductive, material intermediate said core and said sheath with the corrugations of said sheath embedded in said tube for preventing slipping of said core and sid 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 and for conductively interconnecting said screening layer and said sheath, said tube comprising at least one tape made of an insulating material different from that of said insulating layer and being made of semi-conductive crepe paper and said tube being 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 encircling 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 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.

Claim 10

An electric cable comprising at least one core including a conductor surrounded throughout its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core, and a tube of solid, at least semi-conductive, material intermediate said core and said sheath with the corrugations of said sheath embedded in said tube for preventing slipping of said core and sid 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 and for conductively interconnecting said screening layer and said sheath, said tube comprising at least one tape made of an insulating material different from that of said insulating layer and being made of semi-conductive crepe paper and said tube being 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 encircling 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 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.

Claim 11

An electric cable as set forth in claim 5, wherein said tube comprises a winding of glass fiber cloth containing intercalated metal wires would around said tape.