Abstract: A sheath is provided with necessary conditions where inner and outer surfaces thereof are both formed in an uneven helical shape, where the outer surface of a trough is almost flat, where a width W of the trough between inflection points of a curve along the inner surface of the trough and a width w of a top between inflection points of a curve along the top satisfy the relation of W>w, where a thickness T of the trough and a thickness t of the top satisfy the relation of T>t, where a projection of the inner surface of the trough is formed in a gentle arc compared to a recess of the inner surface of the top, and where an inner perimeter of the recess of the inner surface projects circumferentially outward more than an outer-perimeter of the outer surface of the trough. The sheath is entirely formed of polyolefin resin material.

Abstract: A metallic sheath for an electric cable with a ratio of inner diameter Di to outer diameter Do of at least 0.9, comprises a lengthwise welded, annularly or helically shaped corrugated tube whose wall thickness is in a range between 0.005 and 0.009 of the outer diameter, and where the distance p between two neighboring corrugation crests is in a range between 0.08 and 0.12 of the outer diameter. In addition, a method of making the above described electric cable is described.

Abstract: This invention relates to an energy conducting cable assembly. In accordance with one aspect of the present invention, the assembly comprises a conductor covered by at least one layer of insulation, and a longitudinally welded corrugated brass sheath formed about the insulation so as to effect a hermetic seal about the conductor. The cable has an ampacity and fault carrying capacity which approximates that of a cable having a like diameter sheath of chemical lead. The sheath preferably has a corrugation pitch to corrugation depth ratio of less than about 3.75 and an outside sheath diameter to sheath wall thickness ratio of greater than about 100.

Abstract: A method for making a flexible coaxial cable (38) in which a threaded dielectric core (30) is threadably inserted into a flexible hollow outer conductor sheath (50) to lock the core (30) to the outer conductor (50). The outer diameter (d3) of the core (30) is larger than the inside diameter (d2) of the outer sheath (50) such that the peak-to-peak diameter (d3) of the core (30) is 2/1000 of an inch-5/1000 of an inch larger than the inside diameter (d2) of the conductive sheath (50). The outer conductive sheath (50) comprises a corrugated portion (52) having a plurality of peaks (54) and valleys (56) at a predetermined pitch (P.sub.1) which may be the same or different than the pitch (P.sub.2) of the threaded core (30) with the valleys (56) becoming sufficiently embedded in the core (30) during threading to lock the core (30) and sheath (50) together to provide electrical stability for the cable (38) without causing mechanical deformation of the sheath (50).

Abstract: An improved method of making a flexible coaxial cable (10) having a dielectric core (12) comprising an inner conductor (14) and a dielectric (16) surrounding the inner conductor (14), and a corrugated outer conductive sheath (18, 20) having a plurality of peaks (22) and valleys (24) of predetermined pitch, comprises the step of substantially simultaneously crimping solely the valleys (24) from at least three angularly spaced directions, such as three equiangularly spaced directions about the longitudinal axis (110) of the outer sheath (18, 20), by using angularly spaced crimping wheels (100, 102, 104) which float to follow the predetermined pitch of the corrugated sheath (18, 20) for embedding the valleys (24) in the dielectric (12, 16) so as to lock the dielectric (12, 16) to the sheath (18, 20) for providing electrical stability for the resultant coaxial cable (10).

Abstract: A bonded sheath cable (20) includes a core (22) and a longitudinally wrapped outer shield (36) which encloses the core. An outer surface of the shield is provided with a layer (39) of a copolymer adhesive material which causes the shield to bond to an outerlying plastic jacket (41). The shield is wrapped longitudinally about the core to have overlapping portions (51,53) which form a longitudinal seam (38). In order to avoid seam splitting of the jacket along a line aligned with the longitudinal edge (55) of the outer overlapping portion, control means (60) comprising a polymeric material is provided to extend in bicircumferential directions from the longitudinal edge thereby reducing the bond along the overlap seam and allowing the cable to bend and/or twist without causing a stress concentration in the plastic overlying the longitudinal edge.

Abstract: An optical fiber cable (20) includes a core (21) comprising at least one optical fiber (24) which is enclosed in a tubular member (34) and which includes a sheath system (40). The sheath system includes two strength members 42--42 which extend linearly longitudinally along the cable parallel to a longitudinal axis (29) of the cable. The strength members are enclosed in a plastic jacket (46). The strength members have predetermined relative tensile and compressive stiffnesses. The stiffnesses are such that the strength members are capable of withstanding expected compressive as well as tensile loading and are coupled sufficiently to the jacket to provide a composite arrangement which is effective to inhibit contraction and which controls the position of the neutral axis during bending while providing suitable flexibility.

Abstract: A cable shielding system is disclosed wherein corrugated metal shielding has its edges bent to a predetermined configuration prior to being formed about the cable. Upon being formed around the cable, the sheathing with the pre-bent edges forms a closed passage way within the seam for receiving an adhesive. The pre-bent edge configuration reduces the possibility that the edge of the metallic sheathing will damage an externally applied plastic sheath.

Abstract: In a multi-wire electric power cable, particularly a supply cable for borehole units such as pumps, each insulated wire is protected by a corrugated sheath. In order to be able to withstand high pressures of, for instance, 300 bar, the corrugation of the corrugated sheaths is so developed with respect to depth and pitch of corrugation that the length of each corrugated sheath is between 33 and 67%, and preferably 45 to 55%, shorter than the smooth tube from which it has been produced.

Abstract: A cable having a composite shield and armour sheath design is disclosed. The cable comprises a cable core, a sheath of corrugated laminated tape surrounding the cable core and formed by bonding a plastic coated aluminum tape to a wider steel tape with one edge of the aluminum tape registering with one edge of the steel tape, and an outer jacket of polyethylene overlying the sheath of corrugated laminated tape. The uncovered portion of the steel tape overlaps the registering edges of the laminated tape, to form a uniform unwelded overlap.

Abstract: A bonded ASP cable includes a multiconductor core which is filled with a waterproofing material. The core is enclosed by a plastic layer (28) which is flooded with a waterproofing material. Wrapped longitudinally about the plastic layer is a corrugated inner shield (31) having a longitudinal seam (35) and having an outer surface covered with a waterproofing material. The inner shield is enclosed by a corrugated outer shield (36) which has an overlapped longitudinal seam (38) and which has an outer surface coated with a layer of an adhesive material. As the outer shield is being formed, a sealant material is introduced into engagement with the inner shield in the vicinity of the longitudinal edge portions of the outer shield. Then as the longitudinal edge portions of the outer shield are overlapped and engaged with each other, the sealant material is caused to flow into cavities between the two shields adjacent to the seam of the outer shield to form a gasket (66).

Abstract: The present invention is a moisture impervious electrical power cable and conduit system. The conduit comprises a moisture impervious, electrically conducting inner layer, which acts as a concentric neutral for the cable, and an outer layer of an electrically insulating or semiconductive polymeric material. The cable, which comprises an insulated central core of electrically conductive material surrounded with a semiconductive polymeric material, is placed longitudinally inside the conduit and is in sufficient electrical contact with the inner layer to allow it to act as a concentric neutral. The cable in conduit article of this invention may then be placed in the ground and should the cable fail, said cable may be withdrawn from the conduit and a new cable drawn through the moisture impervious conduit, thereby eliminating the necessity of disinterring or replacing the entire electrical power line system.

Abstract: A bonded ASP cable includes a multiconductor core which is filled with a waterproofing material. The core is enclosed by a plastic layer (28) which is flooded with a waterproofing material. Wrapped longitudinally about the plastic layer is a corrugated inner shield (31) having a longitudinal seam (35) and having an outer surface covered with a waterproofing material. The inner shield is enclosed by a corrugated outer shield (36) which has an overlapped longitudinal seam (38) and which has an outer surface coated with a layer of an adhesive material. As the outer shield is being formed, a sealant material is introduced into engagement with the inner shield in the vicinity of the longitudinal edge portions of the outer shield. Then as the longitudinal edge portions of the outer shield are overlapped and engaged with each other, the sealant material is caused to flow into cavities between the two shields adjacent to the seam of the outer shield to form a gasket (66).

Abstract: A bonded ASP cable includes a multiconductor core which is filled with a waterproofing material. The core is enclosed by a plastic layer (28) which is flooded with a waterproofing material. Wrapped longitudinally about the plastic layer is a corrugated inner shield (31) having a longitudinal seam (35) and having an outer surface covered with a waterproofing material. The inner shield is enclosed by a corrugated outer shield (36) which has an overlapped longitudinal seam (38) and which has an outer surface coated with a layer of an adhesive material. As the outer shield is being formed, a sealant material is introduced into engagement with the inner shield in the vicinity of the longitudinal edge portions of the outer shield. Then as the longitudinal edge portions of the outer shield are overlapped and engaged with each other, the sealant material is caused to flow into cavities between the two shields adjacent to the seam of the outer shield to form a gasket (66).

Abstract: A sheath system (50) for a lightguide fiber cable (20) includes a corrugated inner shield (51) which is made of a metallic material having suitable electrical and thermal conductivity to dissipate lightning energy and a corrugated outer shield (60). The outer shield which has an overlapped longitudinal seam is a laminate comprising a corrosion-resistant metallic material (64) which has a relatively high elongation, at least a predetermined chromium content, and a relatively coarse outer surface, and an adhesive system (62). Included in the adhesive system is a first adhesive material (66) which bonds to the outer surface of the metallic material and a second adhesive material (68) which causes the outer shield to become bonded to a plastic jacket (70) which is extruded thereover. The bond between the jacket and the outer shield has sufficient peel strength to prevent the jacket from being separated readily from the outer shield.

Abstract: A process and apparatus for manufacturing a cable having a composite shield and armor sheath design is disclosed. The process comprises the steps of corrugating a laminated tape formed by bonding a plastic coated aluminum tape to a wider steel tape with one edge of the aluminum tape registering with one edge of the steel tape, forming the corrugated laminated tape around a cable core with the uncovered portion of the steel tape overlapping the registering edges of the laminated tape, and extruding an outer jacket of polyethylene over the corrugated laminated tape.

Abstract: A cable core, comprising conductors with insulation and carrying a conductive shield layer is protected and shielded by a corrugated metal tube cooperating either with individual, electrically conductive sealing rings, or a conductive helical sealing ribbon with foam filling any gaps. The construction ensures adequate space for thermal expansion of the insulation without undue tensioning of the tube. A method of making the assembly is described and examples for the ribbon and the foam are given.

Abstract: Three or more groups of individually insulated conductors are optionally separately wrapped with insulating material and then either singly or collectively encircled with metal tape material. The groups are secured together by a strengthening steel tape and surrounding protective jacket. By way of example, a series of embodiments are described, each containing three groups of conductors or cores. Screen configurations are presented for enclosing all groups or only the carrier service groups with one tape element that weaves its way in and out between the groups so that each group or core is screened from all adjacent cores. Other configurations employ separate tapes, each enclosing a separate corresponding group. Finally, embodiments are disclosed in which one group is enclosed by one tape element, while two additional groups are collectively enclosed by a single tape element deployed somewhat "S" shape about the cores.

Abstract: A cable which is capable of being made in a large pair size and yet which has excellent mechanical properties that maintain its integrity notwithstanding extremes in temperature during installation and shipping as well as during the rigors of installation includes a sheath system having a corrugated steel outer shield that is adhesively bonded to a plastic jacket. The corrugated steel shield which is formed to have a longitudinal overlapped seam that is preferably unsealed encloses an aluminum inner shield that in turn encloses a multiconductor core. Advantageously, the sheath system includes a plastic jacketing material which is capable of resisting biaxial stresses which are aggravated in a bonded sheath system. This results in jacket integrity about the longitudinal seam of the outer shield notwithstanding a notched cross-section and an unsupported bridged portion of the plastic jacket adjacent to the seam.

Abstract: Three stranded-together, insulated conductors are enveloped in a rubber-elastic, inner sleeve on which sits a corrugated twin tube arrangement of an inner copper tube and an outer steel tube. The corrugations seal the interior in a bulkhead-like fashion.

Abstract: An improved internally screened cable is disclosed that not only provides efficient shielding to meet near-end cross-talk requirements in present day and anticipated future carrier systems, but also armor protection as well, both the shielding and armor protection arising out of a single metallic shielding tape composed of two layers of aluminum or copper metallurgically bonded to both surfaces of an iron or steel layer. The tape is corrugated and has a medial portion integrally joined to two terminal portions. The cable core is composed of two groups of conductors divided and shielded one from the other by the medial portion of the shielding tape. Terminal portions of the shield are bent in opposite directions and lie on the periphery of the groups of the core and extend to and beyond that point where the medial and terminal portions merge.

Abstract: A cable which is capable of being made in a large pair size and yet which has excellent mechanical properties that maintain its integrity notwithstanding extremes in temperature during installation and shipping as well as during the rigors of installation includes a sheath system having a corrugated steel outer shield that is adhesively bonded to a plastic jacket. The corrugated steel shield which is formed to have a longitudinal overlapped seam that is preferably unsealed encloses an aluminum inner shield that in turn encloses a multiconductor core. Advantageously, the sheath system includes a plastic jacketing material which is capable of resisting biaxial stresses which are aggravated in a bonded sheath system. This results in jacket integrity about the longitudinal seam of the outer shield notwithstanding a notched cross-section and an unsupported bridged portion of the plastic jacket adjacent to the seam.

Abstract: Flexible transmission line, wherein it comprises a fluid circulation duct and reinforcements inside and outside the said duct against compressive forces inside and outside the duct, the internal reinforcement comprising at least one cable within said duct, whereby within said duct over the entire length of the line the cable leaves fluid circulation spaces, while the external reinforcements are coaxial to the duct.

Abstract: A high voltage cable which has a composite jacket having inner and outer parts. A corrugated moisture barrier is sandwiched between the parts and bonded to them. The jacket prevents both radial and longitudinal flow of moisture in the cable. The moisture barrier may serve as a return conductor or the jacket may include additional return conductors.

Abstract: A communications cable in which optical waveguides partially fill the inner cross section of a corrugated metallic tubular member and form therein an undulatory configuration extending in the axial direction; thus providing for any given section of cable a length associated with the optical wavesguides that is greater than the length of the corresponding section of the tubular member of such section of communications cable.

Abstract: Sealed power cables (e.g. for underground or submarine use) are often equipped with a metal sheath. A problem with some such cables is that their insulation is subject to greater thermal expansion of the cable during use than the metal sheath is capable of following. According to the present invention the metal sheath (5) is longitudinally corrugated either when the metal sheath is manufactured or by pressing a metal sheet which is originally plane over resilient ribs disposed longitudinally on the cable.

Abstract: There is disclosed a process and apparatus for manufacturing flexible, shielded coaxial cable exhibiting improved magnetical screening capabilities wherein a tubular outer conductor is concentrically formed about an inner conductor with spacer means being disposed in the annulus between conductors. Accordingly, about the inner conductor including spacer means therefore, there is formed an inner component tube of a conductive material by the continuous forming in a lengthwise direction of a metal band into a tube having longitudinal edges welded together in a continuous, longitudinal welded joint. Concurrently, at least one further component tube is formed concentrically about the inner component tube by the lengthwise deformation of a second metal band of a ferromagnetic material into a second tube having opposed longitudinal edges which are also welded in a longitudinal direction in a continuous, longitudinal welded joint.