US3356790A - Coaxial cable - Google Patents

Coaxial cable Download PDF

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Publication number
US3356790A
US3356790A US528495A US52849566A US3356790A US 3356790 A US3356790 A US 3356790A US 528495 A US528495 A US 528495A US 52849566 A US52849566 A US 52849566A US 3356790 A US3356790 A US 3356790A
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US
United States
Prior art keywords
sheath
insulation
conductor
coaxial cable
cable
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
US528495A
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English (en)
Inventor
Fred F Polizzano
Daniel F Robinson
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.)
General Cable Corp
Original Assignee
General Cable Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Cable Corp filed Critical General Cable Corp
Priority to US528495A priority Critical patent/US3356790A/en
Priority to GB52357/66A priority patent/GB1168648A/en
Priority to FR88801A priority patent/FR1506106A/fr
Priority to DE19671640201 priority patent/DE1640201A1/de
Priority to CH217567A priority patent/CH472099A/de
Priority to ES336893A priority patent/ES336893A1/es
Application granted granted Critical
Publication of US3356790A publication Critical patent/US3356790A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/225—Screening coaxial cables
    • 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
    • H01B11/1808—Construction of 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
    • H01B11/1808—Construction of the conductors
    • H01B11/1826—Co-axial cables with at least one longitudinal lapped tape-conductor
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49123—Co-axial cable

Definitions

  • the increased coefiicient of friction is sufficient to transmit longitudinal thermal expansion of the sheath, as when subjected to strong sunlight, to the center conductor so that the connections are not pulled off the center conductor as sometimes occurs in the coaxial cables of the prior art as the result of unequal expansion of the conductors.
  • This invention relates to coaxial cable, and more especially to cable in which the sheath is welded around the insulation that surrounds the center conductor and the sheath is then reduced in diameter by a sinking process in order to grip the insulation.
  • One of the problems that is presented by coaxial cable results from differences in thermal expansion of the metal sheath and the center conductor. For example: in certain areas of the country, fog conditions often exist in the morning; and when the fog dissipates, the cable sheath is subjected to a very sudden change in temperature, caused by the sun. The effect of subjecting the outer sheath to a fast rise in temperature is a longitudinal expansion of the sheath without corresponding expansion of the center conductor and with the result that the connectors are pulled off of the center conductor.
  • the coaxial cable of this invention is constructed so that longitudinal expansion of the sheath is transmitted through the insulation to the center conductor and stretches the center conductor to an increased length substantially equal to the increased length of the sheath.
  • the invention treats the surface of the sheath so as to produce a rough surface having a higher coefiicient of static friction on the insulation than sheaths of the prior art and this increases the axial force that can be transmitted from the sheath to the insulation without increasing the pressure of the sheath against the insulation.
  • the surface of the sheath is treated before the sheath is applied to the insulated core and the treatment is one on which the subsequent sinking of the sheath has no objectionable effect, and is one which does not result in internal reflection or standing waves which impair the signal transmission of the cable when used for television transmission. Both the inside and outside surfaces of the sheath may be roughened, as will be explained herein.
  • FIGURE 1 is a flow diagram showing the successive steps when making coaxial cable in accordance with this invention.
  • FIGURE 2 is a diagrammatic side elevation of apparatus for making coaxial cable by the method of this invention
  • FIGURE 3 is a top plan view of the apparatus shown in FIGURE 2;
  • FIGURES 4 and 5 are sectional views, on a greatly enlarged scale, taken on the lines 4-4 and 5-5, respectively, of FIGURE 2;
  • FIGURE 6 is a greatly enlarged fragmentary, sectional view of the conductor shown in FIGURE 5, the section being taken on the diameter 6-6 of FIGURE 5.
  • the coaxial cable of this invention is made by first applying a sheath 14 to a core 10, the latter consisting of a center conductor 11 (FIGURES 5 and 6), surrounded by electrical insulation 13.
  • a core 10 the latter consisting of a center conductor 11 (FIGURES 5 and 6), surrounded by electrical insulation 13.
  • This core is made in accordance with conventional practice by preheating the conductor 11 and extruding the insulation 13 over the heated conductor; these steps being illustrated at the right of the flow diagram shown in FIGURE 1.
  • the electrical insulation 13 bonds firmly to the conductor 11 because of the extrusion over the hot surface of the conductor. Where there has been relative movement of the center conductor and the sheath of a coaxial cable, as a result of differences in thermal expansion, the slippage has occurred between the outer sheath and the insulation 13 rather than between the center conductor 11 and the insulation 13.
  • the insulated core 10 is fed to a forming station 12 where the metal sheath 14 is progressively formed into a tube around the core 10. As the metal sheath 14 approaches the forming station 12, it is subjected to a roughening operation.
  • the sheath 14 passes through a sand blast chamber 15; but it will be understood that this sand blast chamber is merely illustrative of the preferred embodiment and in the broader aspects of the invention, is merely representative of means for treating the surface of the sheath 14 to increase its coefiicient of static friction on the insulation that surrounds the core 10.
  • the surface which forms the outside of the sheath may be roughened also in the chamber 15, the purpose of which will be explained.
  • the forming of the metal sheath 14 is done in a forming die 16 which is merely representative of means for bending a flat strip into a tube with a longitudinal seam, preferably a butt seam.
  • the electrical insulation on the core 10 is preferably a plastic foam such as polyethylene, having a percent of air of about 45 to 55. These values are given by way of illustration.
  • the plastic foam is maintained substantially uniform in composition and diameter along the entire length of the cable since variations in the density of the foam, or other physical characteristics, affect the electrical characteristics of the cable. Any variations in the original diameter of the insulation produce resulting variations in the squeezing of the insulation by the sheath in the final cable.
  • the outside diameter of the insulation on the core 10 depends upon the diameter of the conductor 11 (FIG- URES and 6) and is preferably at least one and one half times as great as the diameter of the conductor.
  • the radial thickness of the insulation 13 is preferably within a tolerance of 0.002 inch throughout the length of the cable for cores of less than /2" in diameter, and the tolerance is somewhat greater for larger diameter cores.
  • the cable consisting of the conductor core 10 surrounded by the formed metal sheath is indicated by the reference character 25.
  • the formed sheath or tube, designated by the reference character 14 is of an inside diameter substantially larger than the outside diameter of the core 10.
  • the seam of the sheath is indicated by the reference character 28 and this seam is spaced from the insulation 13 so that the seam can be welded without having the welding heat damage the insulation 13.
  • the cable 25 travels through a roll stand 3% at a welding station 32.
  • a torch 34 at the welding station in position to weld the seam 28 as the cable travels from the roll stand 30 to another roll stand 36, spaced closely behind the roll stand 30 and the torch 34 at the welding station 32.
  • a sizing station 40 which includes a bell or sinking die 42, carried by a supporting frame 44; and there is a pipe 46 immediately in front of the die 42 for pouring lubricant over the outside surface of the sheath 14'.
  • the sizing and sinking step is performed by the single stationary die 42 in the illustrated apparatus, but can be done by successive dies.
  • An advantage of having the forming and welding station close to the sizing station is that the core 10 moves faster than the sheath 14 before the tube has passed through the sinking die 42. This is because the core 10 advances at the same speed as the reduced-diameter portion of the sheath beyond the sinking die and because of the elongation of the tube in the die 42, the lineal speed of the sheath ahead of the die 42 is less than that beyond the die.
  • the tube or sheath beyond the sinking die 42 is indicated by the reference character 14a.
  • the reduction in the diameter of the tube or sheath 14' in the sinking die 42 is preferably between about 5% and 40%; the amount of reduction depending upon the original width of the metal sheath 14, as compared to the circumference of the core 10. It is desirable that the tube or sheath 14 be reduced in diameter sufficiently to contact with the core 10 around the entire circumference of the core and to impart some squeeze to the insulation on the core 10 so as to provide friction between the sheath and the insulation.
  • the wall thickness of the sheath is not reduced by its passage through the sinking die 42 and the effect of the die is merely to lengthen the tube as the diameter reduces.
  • This is a sinking operation, as distinguished from a drawing process, which would reduce the sheath thickness as well as its diameter. It is, of course, necessary to use a metal strip for the sheath which has a composition and temper that will elongate in the sinking die 42 in the manner required by the method of this invention, but such sinking operations on tubes are well understood by those skilled in the art.
  • the sheath 14 is made from a fully annealed aluminum strip of electrical conductive grade, the working of the :metal in the sinking die 42 results in a harder tube, up to medium or half hard, depending upon the diameter reduction.
  • the squeeze also affects the impedance value of the insulation. Greater squeezing results in lower impedance, and lesser squeezing results in higher impedance. To obtain the desired electrical properties, therefore, the cable core must be properly designed in accordance with the intended reduction in diameter of the sheath after welding and with a range of squeeze between about 5 and 15 mils.
  • Minimum SRL is 26 db, and preferably about 32 db for 8 to 220 megacycles.
  • a more highly squeezed core has more resistance to slippage of a sheath on the insulation and can, therefore, transmit more axial force to the insulation; but this invention obtains the same result with lighter squeeze by providing the rough surface on the inside of the sheath so that the greater axial force can be transmitted from the sheath to the insulation without impairing the electrical properties of the insulation by resorting to higher squeeze.
  • a capstan 50 pulls the cable 14a with sufiicient force to advance the welded sheath continuously through the sinking die 42 at uniform speed.
  • the capstan 50 includes two drums 52 and 54 mounted for rotation about parallel axles 56 carried by a fixed frame 57.
  • the drums 52 and 54 preferably have suitable grooves for receiving the cable 14a, and the drums 52 and 54 are driven by power with any conventional capstan drive.
  • a pull is exerted on the cable 14a, where it comes off the capstan, as indicated by the arrow 60, so as to keep the convolutions of the cable 14a tight on the drums.
  • capstan illustrated is representative of means for advancing the cable without putting any periodic dents or other imperfections in the sheath such as are sometimes formed by grippers. Any periodic variations in the sheath diameter, even though of small degree, are objectionable for coaxial cable because they produce internal reflections and standing waves which impair the transmission of television signals by the coaxial cable.
  • FIGURE 6 illustrates the principle of operation of this invention when the outer sheath 14a is subjected to heat, as from heat rays 74. These heat rays 74 strike the outer sheath 14a and cause longitudinal expansion of the sheath in an axial direction, as indicated by the arrows 76.
  • the cable expands as a substantially homogeneous mass when subjected to heat from an outside source; and it will also be apparent that the coefiicient of friction of the sheath 14a on the circumference of the insulation 13, must be high enough so that with only moderate squeeze of the insulation by the sheath, there is sufficient force to stretch the conductor 11.
  • This stretching of the conductor 11 may stretch the conductor beyond its elastic limit so that when the sheath 14a cools and contracts, the conductor 11 may have a somewhat wavy contour; and on subsequent expansions and elongations ofthe sheath, the centerconductor will pull taut Without undergoing subsequent permanent stretching.
  • the invention is applicable to popular sizes of coaxial cable. It will be evident that large sizes of cable having center conductors of large cross section could not be stretched by forces which could be transmitted through the insulation surrounding the center conductor. Also, the friction between the sheath and the core insulation could not be made high enough, without excessive squeezes of the insulation to transmit axial forces sufircient to stretch center conductors of heavy cross section.
  • Coaxials are commonly made with copper conductors and aluminum sheaths.
  • This invention is especially valuable for such combinations of metal because the coefiicient of lineal expansion of aluminum is 24x10" whereas that of copper is 14 10- Even though the heating of the cable is so rapid that substantially no heat reaches the inner conductor, there is still a substantial differential expansion between the sheath and the center conductor when the former is made of aluminum, and the latter is made of copper. This invention prevents such differential expansion which often results in the conductor pulling out of its connectors.
  • Other combinations of metal can be used.
  • the center conductor and sheath can both be made of aluminum or the center conductor made of aluminum with copper coating; or the sheath can be made of copper; and materials other than aluminum and copper can be used, though usually they are no commercially practical.
  • the electrical insulation described herein is a foam insulation but the invention is not limited to foam insulation. It can be used with solid insulation or with semi-solid insulation other than foam, for example: with disc or helix insulation.
  • sand blasting is a preferred step for roughening' the surface of the sheath with a random roughening, it is merely representative of the step of roughening the surface insofar as the broader aspects of the invention are concerned. Where sand blasting is used, good results have been obtained by blasting aluminum strip with mesh alumina at 40 pounds air pressure. When the sheath is blasted to roughen one surface, it can be blasted on both surfaces at the same time and this has an advantage if the coaxial cable is to have a jacket extruded over the sheath.
  • the jacket adheres more tenac iously to the roughened surface;
  • Other methods of houghening the surface include chemical treatment, electrochemical treatments, wire brushing, or the use of rolls having rough surfaces; but this latter method involves the hazard of periodic geometric changes in the sheathas compared to the random roughening which is obtained with a sand blast.
  • a coaxial cable comprising a center conductor, insulation surrounding the conductor, an outer metal sheath formed of a strip curved to surround the insulation and said sheath being of substantially uniform cross-sectional periphery throughout its length, the inside surface of the sheath being roughened and the sheath maintaining some pressure on the insulation continuously along the length of the insulation so as to provide friction between the insulation and the sheath, the roughened surface having a coefficient of static friction between the sheath and the insulation that transmits the motion of longitudinal thermal expansion of the sheath to the insulation, the insulation being of sufficient shear strength with respect to the elasticity and cross section of the center conductor to transmit the motion of longitudinal expansion of the sheath to the center conductor to lengthen said conductor in accordance with changes in the length of the sheath when the sheath is heated to a higher temperature than the conductor.
  • the coaxial cable described in claim 1 characterized by the squeeze of the insulation between the sheath being correlated with the coefiicient of static friction of the sheath and the insulation, and with the elasticity of the center conductor, so that the product of the squeeze times said coefiicient of static friction is greater than the force required to stretch the conductor axially in response to any axial elongation of the sheath.
  • the coaxial cable described in claim 1 characterized by the insulation being a plastic foam insulation that is bonded to the conductor and held in the sheath merely by the friction grip of the sheath on the insulation, the inside surface of the sheath being roughened with a random roughening.
  • the coaxial cable described in claim 1 characterized by the cable having a sheath that withstands less axial pull in one direction than the other before slipping on the insulation, and the coefiicient of static friction that transmits the motion to the conductor being the coefficient of friction in the direction in which the sheath has the lower resistance to slippage on the insulation.
  • the coaxial cable described in claim 1 characterized by the sheath being roughened on both its inside and outside surfaces, and closed by a longitudinal welded seam with a tube wall reduced in diameter by sinking.
  • the coaxial cable described in claim 8 characterized by the sheath being made of aluminum and a center conductor being made of copper.
  • the method of making a coaxial cable which comprises applying and bonding electrical insulation to a center conductor, treating at least one surface of a metal strip to roughen the surface, applying the strip lengthwise to the insulation, forming the strip progressively around the insulation as a tube having an inside diameter greater than the outside diameter of the insulation, securing the opposite edges of the tube together as a longitudinal seam, pulling the tube through a sinking die that reduces the diameter of the tube to squeeze the insulation and exert some pressure on said insulation, the shear strength of the insulation being correlated with the elasticity and cross section of the center conductor, and the squeeze being correlated with the coefficient of static friction of the roughened surface on the insulation, to transmit thermal elongation of the sheath through the insulation to the center conductor.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Wire Processing (AREA)
US528495A 1966-02-18 1966-02-18 Coaxial cable Expired - Lifetime US3356790A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US528495A US3356790A (en) 1966-02-18 1966-02-18 Coaxial cable
GB52357/66A GB1168648A (en) 1966-02-18 1966-11-23 Coaxial Cable.
FR88801A FR1506106A (fr) 1966-02-18 1966-12-26 Câble coaxial et son procédé de fabrication
DE19671640201 DE1640201A1 (de) 1966-02-18 1967-02-10 Koaxialkabel und Verfahren zur Herstellung desselben
CH217567A CH472099A (de) 1966-02-18 1967-02-15 Koaxialkabel und Verfahren zur Herstellung desselben
ES336893A ES336893A1 (es) 1966-02-18 1967-02-16 Procedimiento para la fabricacion de cable coaxil.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US528495A US3356790A (en) 1966-02-18 1966-02-18 Coaxial cable

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US3356790A true US3356790A (en) 1967-12-05

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US528495A Expired - Lifetime US3356790A (en) 1966-02-18 1966-02-18 Coaxial cable

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US (1) US3356790A (de)
CH (1) CH472099A (de)
DE (1) DE1640201A1 (de)
ES (1) ES336893A1 (de)
FR (1) FR1506106A (de)
GB (1) GB1168648A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662090A (en) * 1971-04-16 1972-05-09 Anaconda Wire & Cable Co Coaxial cable
US3874076A (en) * 1971-03-26 1975-04-01 Sumitomo Electric Industries Method and apparatus for manufacturing soft metal sheaths for electrical wires
US3926843A (en) * 1973-03-26 1975-12-16 Mobil Oil Corp Fcc ' 'multi-stage regeneration procedure
USRE28961E (en) * 1970-03-26 1976-09-14 Sumitomo Electric Industries, Ltd. Method and apparatus for manufacturing soft metal sheaths for electrical wires
US4089923A (en) * 1977-02-17 1978-05-16 International Telephone & Telegraph Corporation Manufacture of submarine cable
US4137762A (en) * 1977-03-02 1979-02-06 Smith William D Wireline apparatus for use in earth boreholes
US4154976A (en) * 1977-10-25 1979-05-15 General Cable Corporation Flame retardant inside wiring cable made with an annealed metal sheath
US4204086A (en) * 1972-05-23 1980-05-20 Sumitomo Electric Industries, Ltd. Process for the production of highly expanded polyolefin insulated wires and cables
FR2440062A1 (fr) * 1978-10-24 1980-05-23 Cables De Lyon Geoffroy Delore Procede de fabrication d'un cable coaxial
US5495755A (en) * 1993-08-02 1996-03-05 Moore; Boyd B. Slick line system with real-time surface display
US5515603A (en) * 1993-02-17 1996-05-14 Kabelmetal Electro Gmbh Method for manufacturing a coaxial cable
US5946798A (en) * 1996-03-21 1999-09-07 E. Kertscher S.A. Method for manufacturing coaxial cables
USRE36833E (en) * 1989-12-18 2000-08-29 Quick Connectors, Inc. Temperature compensated wire-conducting tube and method of manufacture
US6148925A (en) * 1999-02-12 2000-11-21 Moore; Boyd B. Method of making a conductive downhole wire line system
WO2011080000A1 (de) * 2009-12-30 2011-07-07 Endress+Hauser Gmbh+Co.Kg Vorrichtung mit koaxialem aufbau
US20140284072A1 (en) * 2013-03-25 2014-09-25 Andrew Llc Chain Extended Foam Insulation Coaxial Cable and Method of Manufacture
US11322920B2 (en) 2019-05-03 2022-05-03 Hydro Extrusion USA, LLC Ribbed extruded electrical conduit
DE102023135145A1 (de) * 2023-12-14 2025-06-18 Auto-Kabel Management Gmbh Verfahren zum Herstellen eines geschirmten Leiters

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1043972A (en) * 1973-01-17 1978-12-12 Sumitomo Electric Industries, Ltd. Process for the production of highly expanded polyolefin insulated wires and cables

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1756319A (en) * 1925-03-09 1930-04-29 Western Electric Co Conductor
US3031523A (en) * 1959-11-13 1962-04-24 Gen Cable Corp Aluminum sheathed cable
US3173990A (en) * 1962-08-27 1965-03-16 Andrew Corp Foam-dielectric coaxial cable with temperature-independent relative conductor length

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1756319A (en) * 1925-03-09 1930-04-29 Western Electric Co Conductor
US3031523A (en) * 1959-11-13 1962-04-24 Gen Cable Corp Aluminum sheathed cable
US3173990A (en) * 1962-08-27 1965-03-16 Andrew Corp Foam-dielectric coaxial cable with temperature-independent relative conductor length

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE28961E (en) * 1970-03-26 1976-09-14 Sumitomo Electric Industries, Ltd. Method and apparatus for manufacturing soft metal sheaths for electrical wires
US3874076A (en) * 1971-03-26 1975-04-01 Sumitomo Electric Industries Method and apparatus for manufacturing soft metal sheaths for electrical wires
US3662090A (en) * 1971-04-16 1972-05-09 Anaconda Wire & Cable Co Coaxial cable
US4204086A (en) * 1972-05-23 1980-05-20 Sumitomo Electric Industries, Ltd. Process for the production of highly expanded polyolefin insulated wires and cables
US3926843A (en) * 1973-03-26 1975-12-16 Mobil Oil Corp Fcc ' 'multi-stage regeneration procedure
US4089923A (en) * 1977-02-17 1978-05-16 International Telephone & Telegraph Corporation Manufacture of submarine cable
US4137762A (en) * 1977-03-02 1979-02-06 Smith William D Wireline apparatus for use in earth boreholes
US4154976A (en) * 1977-10-25 1979-05-15 General Cable Corporation Flame retardant inside wiring cable made with an annealed metal sheath
FR2440062A1 (fr) * 1978-10-24 1980-05-23 Cables De Lyon Geoffroy Delore Procede de fabrication d'un cable coaxial
USRE36833E (en) * 1989-12-18 2000-08-29 Quick Connectors, Inc. Temperature compensated wire-conducting tube and method of manufacture
US5515603A (en) * 1993-02-17 1996-05-14 Kabelmetal Electro Gmbh Method for manufacturing a coaxial cable
US5495755A (en) * 1993-08-02 1996-03-05 Moore; Boyd B. Slick line system with real-time surface display
US5946798A (en) * 1996-03-21 1999-09-07 E. Kertscher S.A. Method for manufacturing coaxial cables
US6148925A (en) * 1999-02-12 2000-11-21 Moore; Boyd B. Method of making a conductive downhole wire line system
WO2011080000A1 (de) * 2009-12-30 2011-07-07 Endress+Hauser Gmbh+Co.Kg Vorrichtung mit koaxialem aufbau
US20140284072A1 (en) * 2013-03-25 2014-09-25 Andrew Llc Chain Extended Foam Insulation Coaxial Cable and Method of Manufacture
US9058922B2 (en) * 2013-03-25 2015-06-16 Commscope Technologies Llc Method of manufacturing chain extended foam insulation coaxial cable
US11322920B2 (en) 2019-05-03 2022-05-03 Hydro Extrusion USA, LLC Ribbed extruded electrical conduit
US11670923B2 (en) 2019-05-03 2023-06-06 Hydro Extrusion USA, LLC Ribbed extruded electrical conduit
DE102023135145A1 (de) * 2023-12-14 2025-06-18 Auto-Kabel Management Gmbh Verfahren zum Herstellen eines geschirmten Leiters

Also Published As

Publication number Publication date
FR1506106A (fr) 1967-12-15
GB1168648A (en) 1969-10-29
ES336893A1 (es) 1968-01-16
DE1640201A1 (de) 1970-05-27
CH472099A (de) 1969-04-30

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