US3325321A - Method of making coaxial electric cables - Google Patents

Method of making coaxial electric cables Download PDF

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Publication number
US3325321A
US3325321A US344632A US34463264A US3325321A US 3325321 A US3325321 A US 3325321A US 344632 A US344632 A US 344632A US 34463264 A US34463264 A US 34463264A US 3325321 A US3325321 A US 3325321A
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United States
Prior art keywords
polythene
inner conductor
metal strip
outer conductor
cylinders
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Expired - Lifetime
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US344632A
Inventor
Maslona Jan
Morel Gerald Alan
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International Standard Electric Corp
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International Standard Electric Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • H01B11/1852—Construction of the insulation between the conductors of longitudinal lapped structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/18—Applying discontinuous insulation, e.g. discs, beads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/18—Applying discontinuous insulation, e.g. discs, beads
    • H01B13/20—Applying discontinuous insulation, e.g. discs, beads for concentric or coaxial cables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1036—Bending of one piece blank and joining edges to form article

Definitions

  • a coaxial cable which includes an inner conductor, an outer conductor and electrical insulating material supporting the inner conductor and bonded to the outer conductor.
  • a method of manufacturing a coaxial cable which includes the steps of placing electrical insulation around an inner conductor, placing an outer conductor round the insulation and bonding the electrical insulation to the outer conductor.
  • FIG. 1 is a perspective view of a coaxial cable with a portion of the outer conductor removed
  • FIG. 2 is a similar perspective view to that shown in FIG. 1, but of a different coaxial cable
  • FIG. 3 is a perspective view of a metal strip, with pieces of insulation, disposed thereon, and
  • FIG. 4 is a perspective view of a coaxial cable having the metal strip in FIG. 3 applied as an outer conductor
  • FIG. 5 is a perspective view of another metal strip, with pieces of insulation.
  • FIG. 1 there is shown an inner conductor 1, cellular polythene insulating cylinders 2, and an outer conductor 3.
  • the insulating cylinders 2 have a radial slit 4 and on the inner surface of the outer conductor 3 there is a polythene coating 5 which is bonded to the insulating cylinders 2.
  • the coaxial cable is manufactured by extruding cellular polythene insulating material in a continuous length of cylinderical shape, cuttingit into the cylinders 2, and then cutting the slits 4 in the cylinders 2.
  • the cylinders 2 are then placed on the inner conductor 1 at spaced intervals along its length by pressing the inner conductor 1 in the slots 4.
  • the outer conductor 3 in the form of a polythene coated metal strip is longitudinally folded round the cylinders 2 with the polythene coating 5 on the inside.
  • the outer conductor 3 is then heated to weld the cylinders 2 to the polythene coating 5.
  • the cylinders 2 may be replaced by continuous solid or cellular polythene insulation which is extruded directly about the inner conductor 1.
  • the outer conductor 3 may be formed by helically winding one or more polythene coated tapes round the cylinders 2.
  • the inner conductor 1 has spaced discs 6 of polythene on it instead of the cylinders 2 of cellular polythene. In the discs 6 there is a radial slit 7.
  • This alternative construction of coaxial cable is manufactured in a similar manner to the coaxial cable shown in FIG. 1, with the discs 7 bonded to the coating 5.
  • FIGS. 3 and 4 there is shown a metal strip 8 having a polythene coating 9 and pads 10 of cellular polythene bonded to the polythene coating 9.
  • the metal strip 8 together with the pads 10 is shown being folded round an inner conductor 11. This forms a construction with an outer conductor 12 separated from the inner conductor 11 by the pads 10 which are bent to form cylinders round the inner conductor 11.
  • the pads 10 are cut from a strip of extruded cellular polythene and placed on the polythene coating 9. The assembly is then heated to bond the polythene coating 9 to the pads 10.
  • strips of polythene may replace the pads 10 of cellular polythene. These polythene strips may cross the metal strip at right angles and so form discs round the inner conductor 11 when the metal strip 8 is folded round it. As shown in FIG. 5, the polythene strips 13 also may cross the metal strip 8 diagonally in such a manner that they provide a continuous helix round the inner conductor 11 with the ends of different strips in contact. With reference to FIGURE 5, ends A and B would interface, and ends C and D as well, forming a helical insulation about conduct-or 11 when metal strip 8 is folded.
  • the outer conductor is bonded to the insulating material supporting the inner conductor by means of heating which causes fusion to take place between the insulating material and a layer of similar material on the inner surface of the outer conductor.
  • 'It is not essential for the two materials to be similar so long as they are capable of fusing together, and the layer of material need not be continuous between the pieces of supporting insulating material.
  • the supporting material need not be bonded to the outer conductor through the intermediary of a similar material.
  • An adhesive layer may be applied directly to the inner surface of the outer conductor, and the supporting material may be bonded by means of this layer to the outer conductor. It is possible for the adhesive layer to be applied to the supporting material.
  • a method of manufacturing a coaxial cable comprising the steps of:
  • thermoplastic insulating material bonding longitudinally spaced quadrangular pieces of thermoplastic insulating material to a longitudinal metal strip

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Communication Cables (AREA)
  • Cable Accessories (AREA)

Description

June 13, 1967 J. MAESLONA ETAL 3,325,321
METHOD OF MAKING COAXIAL ELECTRIC CABLES Filed Feb. 13. 1964 2 Sheets-Sheet 1 Inventors JAN MASOA/A GERALD ILMOREL ory J. MASLONA ETAL METHOD OF MAKING COAXIAL ELECTRIC CABLES June 13, 1967 2 Sheets-Sheet 2 Filed Feb. 15. 1964 AL R OR LO T 0 m w MM A w MM w United States Patent 3,325,321 METHOD OF MAKING COAXIAL ELECTRIC CABLES Jan Maslona and Gerald Alan Morel, London, England,
assignors to International Standard Electric Corporation, New York, N.Y., a corporation of Delaware Filed Feb. 13, 1964, Ser No. 344,632 Claims priority, application Great Britain, Mar. 1, 1963, 8,316/63 3 Claims. (Cl. 156-54) This invention relates to coaxial electric cables.
According to the present invention there is provided a coaxial cable which includes an inner conductor, an outer conductor and electrical insulating material supporting the inner conductor and bonded to the outer conductor.
Further according to the present invention there is provided a method of manufacturing a coaxial cable which includes the steps of placing electrical insulation around an inner conductor, placing an outer conductor round the insulation and bonding the electrical insulation to the outer conductor.
In the accompanying drawings which illustrate embodiments of the present invention.
FIG. 1 is a perspective view of a coaxial cable with a portion of the outer conductor removed,
FIG. 2 is a similar perspective view to that shown in FIG. 1, but of a different coaxial cable,
FIG. 3 is a perspective view of a metal strip, with pieces of insulation, disposed thereon, and
FIG. 4 is a perspective view of a coaxial cable having the metal strip in FIG. 3 applied as an outer conductor, and
FIG. 5 is a perspective view of another metal strip, with pieces of insulation.
Referring to FIG. 1, there is shown an inner conductor 1, cellular polythene insulating cylinders 2, and an outer conductor 3. The insulating cylinders 2 have a radial slit 4 and on the inner surface of the outer conductor 3 there is a polythene coating 5 which is bonded to the insulating cylinders 2.
The coaxial cable is manufactured by extruding cellular polythene insulating material in a continuous length of cylinderical shape, cuttingit into the cylinders 2, and then cutting the slits 4 in the cylinders 2. The cylinders 2 are then placed on the inner conductor 1 at spaced intervals along its length by pressing the inner conductor 1 in the slots 4. The outer conductor 3 in the form of a polythene coated metal strip is longitudinally folded round the cylinders 2 with the polythene coating 5 on the inside. The outer conductor 3 is then heated to weld the cylinders 2 to the polythene coating 5.
If desired the cylinders 2 may be replaced by continuous solid or cellular polythene insulation which is extruded directly about the inner conductor 1. The outer conductor 3 may be formed by helically winding one or more polythene coated tapes round the cylinders 2.
In the embodiment shown in FIG. 2 like parts are designated with the same reference numerals as those in FIG. 1. The inner conductor 1 has spaced discs 6 of polythene on it instead of the cylinders 2 of cellular polythene. In the discs 6 there is a radial slit 7.
This alternative construction of coaxial cable is manufactured in a similar manner to the coaxial cable shown in FIG. 1, with the discs 7 bonded to the coating 5.
Referring to FIGS. 3 and 4 there is shown a metal strip 8 having a polythene coating 9 and pads 10 of cellular polythene bonded to the polythene coating 9. In FIG. 4 the metal strip 8 together with the pads 10 is shown being folded round an inner conductor 11. This forms a construction with an outer conductor 12 separated from the inner conductor 11 by the pads 10 which are bent to form cylinders round the inner conductor 11.
The pads 10 are cut from a strip of extruded cellular polythene and placed on the polythene coating 9. The assembly is then heated to bond the polythene coating 9 to the pads 10.
If desired strips of polythene may replace the pads 10 of cellular polythene. These polythene strips may cross the metal strip at right angles and so form discs round the inner conductor 11 when the metal strip 8 is folded round it. As shown in FIG. 5, the polythene strips 13 also may cross the metal strip 8 diagonally in such a manner that they provide a continuous helix round the inner conductor 11 with the ends of different strips in contact. With reference to FIGURE 5, ends A and B would interface, and ends C and D as well, forming a helical insulation about conduct-or 11 when metal strip 8 is folded.
In the embodiments described the outer conductor is bonded to the insulating material supporting the inner conductor by means of heating which causes fusion to take place between the insulating material and a layer of similar material on the inner surface of the outer conductor.
'It is not essential for the two materials to be similar so long as they are capable of fusing together, and the layer of material need not be continuous between the pieces of supporting insulating material.
The supporting material need not be bonded to the outer conductor through the intermediary of a similar material. An adhesive layer may be applied directly to the inner surface of the outer conductor, and the supporting material may be bonded by means of this layer to the outer conductor. It is possible for the adhesive layer to be applied to the supporting material.
It is to be understood that the foregoing description of specific examples of this invention is not to be considered as a limitation on its scope.
What we claim is:
1. A method of manufacturing a coaxial cable comprising the steps of:
bonding longitudinally spaced quadrangular pieces of thermoplastic insulating material to a longitudinal metal strip; and
longitudinally folding said metal strip about an inner conductor so that said pieces of insulating material encircle and support said inner conductor.
2. A method as claimed in claim 1 in which the spaced pieces form cylinders at spaced intervals along the length of the inner conductor when applied thereto.
3. A method as claimed in claim 1 in which the spaced pieces form at least one continuous helix round the inner conductor when applied thereto.
(References on following page) 3 7 '4 References Cited 3,173,990 3/1965 Lamons 174102 et a1. 31322 g et FOREIGN PATENTS 0e 1 1/1942 Scheldorf 174 2s X 5 12/1950 Fmland' 11/1948 Gordon 584,153 1/1947 Great Bntam.
8/1957 Kinghorn 156-54 10/1957 Peters 174 1O2 EARL M. BERGERT, Primary Examiner.
2/1964 Mildner 174 2. JOHN F. BURNS, Examiner. 8/ 1964 'Hahne 174102 X D. A. KETTLESTRINGS, Assistant Examiner.

Claims (1)

1. A METHOD OF MANUFACTURING A COAXIAL CABLE COMPRISING THE STEPS OF: BONDING LONGITUDINALLY SPACED QUADRANGULAR PIECES OF THERMOPLASTIC INSULATING MATERIAL TO A LONGITUDINAL METAL STRIP; AND LONGITUDINALLY FOLDING SAID METAL STRIP ABOUT AN INNER CONDUCTOR SO THAT SAID PIECES OF INSULATING MATERIAL ENCIRCLE AND SUPPORT SAID INNER CONDUCTOR.
US344632A 1963-03-01 1964-02-13 Method of making coaxial electric cables Expired - Lifetime US3325321A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8316/63A GB990002A (en) 1963-03-01 1963-03-01 Electric cables

Publications (1)

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US3325321A true US3325321A (en) 1967-06-13

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US (1) US3325321A (en)
AT (1) AT256210B (en)
BE (1) BE644552A (en)
CH (1) CH419266A (en)
DE (1) DE1590537A1 (en)
GB (1) GB990002A (en)
NL (1) NL6401968A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436287A (en) * 1965-07-02 1969-04-01 Bell Telephone Labor Inc Coaxial cable manufacturing method
US3497367A (en) * 1964-10-02 1970-02-24 Commw Scient Ind Res Org Opaline materials and method of preparation
US4859534A (en) * 1984-11-19 1989-08-22 Chemical Vulcanising Systems (Proprietary) Limited Method and apparatus for repairing a cable

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660589A (en) * 1969-09-29 1972-05-02 Gen Cable Corp Watertight disc coaxial cable
GB8500034D0 (en) * 1985-01-02 1985-02-13 Telephone Cables Ltd Coaxial cables

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757030A (en) * 1927-04-25 1930-05-06 Watson John Francis Electric cable
US2060162A (en) * 1932-06-30 1936-11-10 Western Electric Co Electric cable and apparatus for manufacturing it
US2269991A (en) * 1940-03-08 1942-01-13 Gen Electric High frequency transmission line
GB584153A (en) * 1944-10-20 1947-01-08 Standard Telephones Cables Ltd Improvements in or relating to electric communication cables
US2453313A (en) * 1943-04-29 1948-11-09 Bell Telephone Labor Inc Method of manufacturing communication cables
FI24206A (en) * 1947-10-13 1950-03-10 Int Standard Electric Corp Elektrisk kabel för överföring av höga frekvenser
US2803730A (en) * 1955-05-04 1957-08-20 Kaiser Aluminium Chem Corp Method of forming lined tubing
US2808450A (en) * 1950-11-22 1957-10-01 Melville F Peters Electric cables and the method of making the same
US3121136A (en) * 1960-07-04 1964-02-11 Mildner Raymond Charles Co-axial cable having inner and outer conductors corrugated helically in opposite directions
US3146297A (en) * 1960-02-25 1964-08-25 Felten & Guilleaume Carlswerk Coaxial cable with helical insulating spacer
US3173990A (en) * 1962-08-27 1965-03-16 Andrew Corp Foam-dielectric coaxial cable with temperature-independent relative conductor length
US3177286A (en) * 1962-09-18 1965-04-06 Tellite Corp Co-axial cable with helical insulation

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757030A (en) * 1927-04-25 1930-05-06 Watson John Francis Electric cable
US2060162A (en) * 1932-06-30 1936-11-10 Western Electric Co Electric cable and apparatus for manufacturing it
US2269991A (en) * 1940-03-08 1942-01-13 Gen Electric High frequency transmission line
US2453313A (en) * 1943-04-29 1948-11-09 Bell Telephone Labor Inc Method of manufacturing communication cables
GB584153A (en) * 1944-10-20 1947-01-08 Standard Telephones Cables Ltd Improvements in or relating to electric communication cables
FI24206A (en) * 1947-10-13 1950-03-10 Int Standard Electric Corp Elektrisk kabel för överföring av höga frekvenser
US2808450A (en) * 1950-11-22 1957-10-01 Melville F Peters Electric cables and the method of making the same
US2803730A (en) * 1955-05-04 1957-08-20 Kaiser Aluminium Chem Corp Method of forming lined tubing
US3146297A (en) * 1960-02-25 1964-08-25 Felten & Guilleaume Carlswerk Coaxial cable with helical insulating spacer
US3121136A (en) * 1960-07-04 1964-02-11 Mildner Raymond Charles Co-axial cable having inner and outer conductors corrugated helically in opposite directions
US3173990A (en) * 1962-08-27 1965-03-16 Andrew Corp Foam-dielectric coaxial cable with temperature-independent relative conductor length
US3177286A (en) * 1962-09-18 1965-04-06 Tellite Corp Co-axial cable with helical insulation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497367A (en) * 1964-10-02 1970-02-24 Commw Scient Ind Res Org Opaline materials and method of preparation
US3436287A (en) * 1965-07-02 1969-04-01 Bell Telephone Labor Inc Coaxial cable manufacturing method
US4859534A (en) * 1984-11-19 1989-08-22 Chemical Vulcanising Systems (Proprietary) Limited Method and apparatus for repairing a cable

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Publication number Publication date
AT256210B (en) 1967-08-10
GB990002A (en) 1965-04-22
NL6401968A (en) 1964-09-02
CH419266A (en) 1966-08-31
DE1590537A1 (en) 1969-08-21
BE644552A (en) 1964-09-02

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