US3766309A - Electric cable with corrugated metallic sheath - Google Patents

Electric cable with corrugated metallic sheath Download PDF

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Publication number
US3766309A
US3766309A US00162199A US3766309DA US3766309A US 3766309 A US3766309 A US 3766309A US 00162199 A US00162199 A US 00162199A US 3766309D A US3766309D A US 3766309DA US 3766309 A US3766309 A US 3766309A
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US
United States
Prior art keywords
core
sheath
cable
tube
tape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00162199A
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English (en)
Inventor
P Calzolari
S Longoni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pirelli and C SpA
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Individual
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Publication of US3766309A publication Critical patent/US3766309A/en
Assigned to SOCIETA' PIRELLI S.P.A., A COMPANY OF ITALY reassignment SOCIETA' PIRELLI S.P.A., A COMPANY OF ITALY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INDUSTRIE PIRELLI S.P.A.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/20—Metal tubes, e.g. lead sheaths

Definitions

  • ABSTRACT An electric cable having one or more insulated cores surrounded by a corrugated metal sheath and having a tubular covering intermediate the core and the sheath which covering is softer than the core and is deformed by the sheath corrugations which are embedded therein.
  • the covering may be wrapped tapes of crepe paper or expanded foam synthetic resin or a tube of synthetic resin extruded over the core or cores.
  • cables encounter surroundings which subject them to strong unidirectional vibrations, for example, in the subsoil of a motorway or when arranged in vertical wells, so that only the sheath is firmly fixed while the cable core has to support its own weight.
  • the stresses which tend to move the core with respect to the sheath exceed the maximum detachment resistance between the two parts.
  • the present invention serves to eliminate the abovementioned problems, with a cable with corrugated metallic sheath in which the anchoring force applied to the sheath is transmitted by the latter to the core of the cable thus preventing the relative slipping between sheath and core during operation, while offering the maximum assurance that the core of the cable will retain unaltered its integral structure.
  • the present invention concerns an electric cable comprising a core contained in a corrugated metallic sheath, characterized by the fact that it also comprises a soft tubular covering, protecting and engaging said core, the corrugations of the sheath embedding themselves, for at least a part of their depth, in the soft tubularcovering, so that the corrugations of the sheath deform the covering and grip it.
  • FIG. 1 represents a longitudinal axial, partial section of an electric cable with a corrugated metallic sheath according to a preferred form-of the invention
  • FIG. 2 represents a longitudinal axial, partial section of an electric cable with corrugated metallic sheath according to a further form of the invention.
  • the electric cable which could be of the telecommunication, power transmission or control type, comprises a core 11 surrounded by a corrugated metallic sheath 12, preferably of aluminum.
  • the core 11 shown in FIG. 1 comprises a conductor 17, either solid or stranded, surrounded by one or'more layers of insulation 18 which may in turn be surrounded by one or more layers of insulation, conductive material or semi-conductive material 19. Such layer or layers 19 are covered by an outer protective layer or layers 20, such as a wrapping of non-conductive material or a metal sheath.
  • the core 11 may take any conventional form or the core may be a plurality of separately insulated conductors contained within the cov ering 13. i
  • the material of the covering 13 is softer, i.e. more readily deformable, than the outer covering of the core 11, so that it may be deformed as shown in FIG. 1 without applying pressure to the core 11 which would cause any substantial deformation thereof.
  • the covering 13 frictionally engages the exterior of the core 11 so as to resist slipping of the core 11 with respect thereto.
  • the material of the covering 13 is self-sustaining and resilient and is to be distinguished from sealing compounds sometimes used to fill the corrugations of the sheath 12, the latter compounds being flowable and having a low shear strength and therefore, offering little resistance to slipping between the sheath 12 and the core 11.
  • the covering 13 on the core 11 of the cable is formed by helically winding or longitudinally applying, during the manufacturing process, one or more tape-like elements, for example, tapes of crepe paper, or of synthetic material, such as, for example, expanded foam.
  • This soft tubular covering 13 of a suitable thickness provides protection for the core 11, during the corrugating phase of the sheath 12.
  • its thickness is at least equal to the spacing, if any, between the smallest interior surface of the sheath 12 and the core 11 plus at least onehalf the interior depth of the corrugation.
  • the work is carried out in such a way that the corrugation of the sheath 12 depresses, or becomes embedded in, the covering 13 which, being soft, adapts itself to the internal shape of said sheath 12, while providing in all cases, a sufficiently protecting layer between the lowest points l4, 15, etc. of the helical corrugations and the core 11.
  • the soft tubular covering 13 can also be obtained by the extrusion of synthetic material on to the core 11 of the cable 10.
  • the sheath 12 can be embedded in the covering 13, for the whole of the depth of its corrugations, as in FIG. 1, or for at least a part of said depth, so that spaces 17 are left between the soft tubular covering l3 and the highest point 16 of the corrugations, as shown in FIG. 2.
  • both the embodiments completely of aluminum or any other type of conducting metal, during operation.
  • 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 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
  • a cable as set forth in claim 1, wherien said tape is made of crepe paper.

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  • Insulated Conductors (AREA)
US00162199A 1970-07-14 1971-07-13 Electric cable with corrugated metallic sheath Expired - Lifetime US3766309A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2739570 1970-07-14

Publications (1)

Publication Number Publication Date
US3766309A true US3766309A (en) 1973-10-16

Family

ID=11221562

Family Applications (1)

Application Number Title Priority Date Filing Date
US00162199A Expired - Lifetime US3766309A (en) 1970-07-14 1971-07-13 Electric cable with corrugated metallic sheath

Country Status (6)

Country Link
US (1) US3766309A (enrdf_load_stackoverflow)
CA (1) CA946950A (enrdf_load_stackoverflow)
DE (1) DE2130075A1 (enrdf_load_stackoverflow)
FR (1) FR2098386B1 (enrdf_load_stackoverflow)
IE (1) IE35446B1 (enrdf_load_stackoverflow)
ZA (1) ZA714550B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885088A (en) * 1973-05-23 1975-05-20 Pirelli Fully-filled telephone cable with improved screen
JPS50148584U (enrdf_load_stackoverflow) * 1974-05-29 1975-12-10
US4020276A (en) * 1975-04-11 1977-04-26 Scal - Societe De Conditionnements En Aluminum Sealant barrier for electrical cables
US4568401A (en) * 1983-07-21 1986-02-04 Davis Ervin M Method of making a free floating sheathed cable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29510907U1 (de) * 1995-07-06 1995-10-19 Mohr, Karl Eugen, 67466 Lambrecht Schutzummantelung für Kabel, Litzen u.dgl.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1047896B (de) * 1952-04-15 1958-12-31 Siemens Ag Aus ein- oder mehrschichtigem dielektrischem Stoff bestehende Wellenfuehrungsanordnung
US2890263A (en) * 1952-11-18 1959-06-09 Hackethal Draht & Kabelwerk Ag Coaxial cables
US2995616A (en) * 1961-08-08 Nicolas
US3130256A (en) * 1960-07-04 1964-04-21 Mildner Raymond Charles Cables for transmitting high-frequency currents
US3173990A (en) * 1962-08-27 1965-03-16 Andrew Corp Foam-dielectric coaxial cable with temperature-independent relative conductor length
US3394400A (en) * 1965-10-22 1968-07-23 Andrew Corp Corrugated sheath coaxial cable with water-sealing barriers and method of making same
US3557301A (en) * 1967-05-23 1971-01-19 Pirelli Sheathing of electrical cables
US3590141A (en) * 1969-02-17 1971-06-29 Dow Chemical Co Electric cable having improved resistance to moisture

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1900492A (en) * 1930-04-01 1933-03-07 Nat Electric Prod Corp Armored cable
US2348641A (en) * 1941-03-31 1944-05-09 Parker Appliance Co Electric cable
FR1391746A (fr) * 1963-04-02 1965-03-12 Superior Cable Corp Câble électrique à noyau conducteur isolé
FR1534636A (fr) * 1967-08-25 1968-07-26 Texas Instruments Inc Blindage de câble

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2995616A (en) * 1961-08-08 Nicolas
DE1047896B (de) * 1952-04-15 1958-12-31 Siemens Ag Aus ein- oder mehrschichtigem dielektrischem Stoff bestehende Wellenfuehrungsanordnung
US2890263A (en) * 1952-11-18 1959-06-09 Hackethal Draht & Kabelwerk Ag Coaxial cables
US3130256A (en) * 1960-07-04 1964-04-21 Mildner Raymond Charles Cables for transmitting high-frequency currents
US3173990A (en) * 1962-08-27 1965-03-16 Andrew Corp Foam-dielectric coaxial cable with temperature-independent relative conductor length
US3394400A (en) * 1965-10-22 1968-07-23 Andrew Corp Corrugated sheath coaxial cable with water-sealing barriers and method of making same
US3557301A (en) * 1967-05-23 1971-01-19 Pirelli Sheathing of electrical cables
US3590141A (en) * 1969-02-17 1971-06-29 Dow Chemical Co Electric cable having improved resistance to moisture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885088A (en) * 1973-05-23 1975-05-20 Pirelli Fully-filled telephone cable with improved screen
JPS50148584U (enrdf_load_stackoverflow) * 1974-05-29 1975-12-10
US4020276A (en) * 1975-04-11 1977-04-26 Scal - Societe De Conditionnements En Aluminum Sealant barrier for electrical cables
US4568401A (en) * 1983-07-21 1986-02-04 Davis Ervin M Method of making a free floating sheathed cable

Also Published As

Publication number Publication date
IE35446L (en) 1972-01-14
FR2098386B1 (enrdf_load_stackoverflow) 1974-09-27
CA946950A (en) 1974-05-07
DE2130075A1 (de) 1972-02-03
IE35446B1 (en) 1976-02-18
FR2098386A1 (enrdf_load_stackoverflow) 1972-03-10
AU3113371A (en) 1973-01-18
ZA714550B (en) 1972-03-29

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SOCIETA PIRELLI S.P.A., PIAZZALE CADORNA 5, 20123

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INDUSTRIE PIRELLI S.P.A.;REEL/FRAME:003847/0084

Effective date: 19810101