US2228797A - Manufacture of telephone cables - Google Patents

Manufacture of telephone cables Download PDF

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Publication number
US2228797A
US2228797A US209305A US20930538A US2228797A US 2228797 A US2228797 A US 2228797A US 209305 A US209305 A US 209305A US 20930538 A US20930538 A US 20930538A US 2228797 A US2228797 A US 2228797A
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US
United States
Prior art keywords
conductor
filling
piece
work
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
US209305A
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English (en)
Inventor
Wassermann Gunter
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.)
Co "LE CONDUCTEUR ELECTRIQUE BLINDE INCOMBUSTIBLE"
Co LE CONDUCTEUR ELECTR B
Pyrotenax Ltd
Original Assignee
Co LE CONDUCTEUR ELECTR B
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 Co LE CONDUCTEUR ELECTR B filed Critical Co LE CONDUCTEUR ELECTR B
Application granted granted Critical
Publication of US2228797A publication Critical patent/US2228797A/en
Anticipated expiration legal-status Critical
Assigned to PYROTENAX LIMITED reassignment PYROTENAX LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PRECISION MECANIQUE LABINAL, SOCIETE ALSACIENNE CONSTRUCTIONS MECANIQUES
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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/16—Rigid-tube 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
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/12—Arrangements for exhibiting specific transmission characteristics
    • H01B11/14—Continuously inductively loaded cables, e.g. Krarup cables
    • H01B11/146—Continuously inductively loaded cables, e.g. Krarup cables using magnetically loaded coatings

Definitions

  • the present invention relates to a novel construction of telephone cable having a discontinuous filling and intended for the transmission of weak currents.
  • this type of construction necessarily leads, on the one hand to forming the outer conductor by two or morefstrips of a good conducting material which are cabled together with a relatively quick pitch, and on the other hand to providing, on said strips, grooves which are adapted to receive and secure the filling coils and the spacing members which have previously been arranged on the central conductor.
  • This produces an increase of resistance of the outer conductor which is caused in the first place by the increase of length of the current streams due to the cabling of the strips and to the grooves created on said strips, which results in an increase of the Fac weakening of the cable.
  • Figure l is a longitudinal sectional view showing one form of the invention.
  • Figure 2 is a similar view of a modification
  • Figure 3 is a similar view of a further modifif cation
  • Figure 4 is a similar view of a still further modification
  • Figure 5 is a cross sectional view illustrating a plurality of cables within a single sheath.
  • Figure 6 is a similar cross sectional view illustrating a modified construction with a plurality' of cables within a single sheath.
  • the present invention enablesA the foregoing drawbacks to be eliminated by forming a co-axlal cable a having a discontinuous inductive filling and in which the centering is automatically ensured and the outer conductor is formed by a continuous cylindrical sheath b made of a good conducting material.
  • the space between the central conductor a and the outer conductor b is filled with insulating material c such as magnesia and is replaced, at regular intervals, over a predetermined length of the conductor, by a ferromagnetic powder d the vparticles of which are insulated from each other.
  • insulating material c such as magnesia
  • the powdered insulator c and the ferromagnetic powder d before being placed on the conductor, are compressed so as, to have substantially the same or similar degree of compacity and then have the shape of cylinders provided with a central hole, the diameter of the hole being essentially that of the central conductor and the outer diameter of the cylinder being essentially the inner diameter of the outer conductor. It is of advantage that the taken compacities are limit compacities.
  • the workpiece consisting of the central conductor a on which the ⁇ insulating cylinders c, the cyl'nders of compressed ferromagnetic powder d. and the outer cylindrical sheath b have been suitably arranged, is subjected to a drawing operation which is intended to give it the dimensions and espcc'ally the required diameter for the use it is desired to make of it (underground, submarine, aerial, telephone cable).
  • the filling of the central conductor of a co-axial cable decreases the cut-oil frequency of the cable, that is to say the frequency beyond which transmission is no longer possible, but on the other hand it decreases the weakening produced by the non-filled co-axial in the band transmitted.
  • the spacing of the filling points should be such that there is a fairly large number of coils per wave length corresponding tothe highest frequency it is desired to transmit.
  • Nine or more filling points may be taken for example per wave length thus defined.
  • the manufacture can be started, said manufactureconsisting in, after having arranged, as stated above, all the elements in the cylindrical work-piece, subjecting said workpiece to successive drawing operations alternating with intermediate annealing operations until the desired diameter is obtained. It will be observed that as the successive drawing operations may cause the ferromagnetic powder to lose its permeability, the intermediate annealing operations will be graduated so as to restore to it at the end of the operation the permeability on ⁇ which the previous calculation was based.
  • the compressed insulating cylinders have a central hole which has very accurately the diameter of the central conductor and the same is the case with the cylinders made of compressed ferromagnetic powder.
  • the outer diameter of said cylinders is equal to the inner diameter of the cylindrical work-piece from which the manufacture is started, it will be seen that the centering of the inner conductor is automatically ensured over its entire length.
  • the process of manufacture itself gives the outer conductor the shape of a continuous cylindrical sheath which is a good conductor and performs the function of a screen for the outer disturbing fields.
  • the cylinders made of compressed ferro-magnetic powder d may be insulated from the inner conductor a and/or from the outer conductor b by arranging rings e of compressed insulating powder between the cylinders d made of powder and the inner and/or outer conductors a and b,- respectively (see Figs. 2, 3 and 4).
  • Another shape may also be adopted than the cylindrical shape for the outer conductor, for example a circular segmental shape, or an elliptical shape.
  • a plurality of cables a according to the invention may be grouped in a single sheath b. (Figs. 5 and 6). All these modifications do not involve any change in the spirit of the invention.
  • a conductor for telephone cables having a high inductive filling which are obtained by drawing from a work-piece comprising at least one core, an outer metal sheath, and interposed between said core and said sheath alternate fillings longitudinally on the one hand of ferro-magnetic elements insulated from each other, and on the other hand of insulating material.
  • a conductor for telephone cables having a high inductive filling which are obtained by drawingl from a work-piece comprising at least one core, an outer metal sheath, and interposed between said core and said sheath, alternate fillings on the one hand of ferro-magnetic elements insulated from each other, and on the other hand of insulating material, said fillings being in a highly compressed state.
  • a conductor for telephone cables having a high inductive filling which are obtained by drawing from a work-piece comprising at least one core, an outer metal sheath and, interposed between said core and said sheath, alternate fillings on the one hand of elements formed by particules of ferro-nickel insulated from each other, and on the other hand by an insulating material.
  • a conductor for telephone cables having a high inductive filling which are obtained by draw, ing from a work-piece comprising at least one core, an outer metal sheathand, interposed between said core and sheath, a filling made of a-compressed powdered insulating material and interrupted at regular intervals by a filling of ferromagnetic elements which are insulated from each other.

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  • Insulated Conductors (AREA)
US209305A 1937-05-24 1938-05-21 Manufacture of telephone cables Expired - Lifetime US2228797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2228797X 1937-05-24

Publications (1)

Publication Number Publication Date
US2228797A true US2228797A (en) 1941-01-14

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US209305A Expired - Lifetime US2228797A (en) 1937-05-24 1938-05-21 Manufacture of telephone cables

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US (1) US2228797A (d)
BE (1) BE428242A (d)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2569667A (en) * 1946-07-18 1951-10-02 Rca Corp Electrical filter unit
US2669603A (en) * 1951-01-31 1954-02-16 Transmission line with magnetic
US2727945A (en) * 1951-01-31 1955-12-20 Lignes Telegraph Telephon High frequency magnetic elements and telecommunication circuits
US2779925A (en) * 1951-09-29 1957-01-29 Bell Telephone Labor Inc Composite coaxial resonator
US2877433A (en) * 1954-11-01 1959-03-10 Tobe Deutschmann Corp Coaxial filter
DE1103423B (de) * 1956-02-09 1961-03-30 Siemens Ag Anordnung von einem oder mehreren Leitern zur Fuehrung hochfrequenter elektromagnetischer Wellen
US3125733A (en) * 1964-03-17 Transmission line having high attenuation for radiant
US3191132A (en) * 1961-12-04 1965-06-22 Mayer Ferdy Electric cable utilizing lossy material to absorb high frequency waves
US3309633A (en) * 1963-01-10 1967-03-14 Mayer Ferdy Anti-parasite electric cable
US3456215A (en) * 1964-09-02 1969-07-15 Peter A Denes High frequency low pass filter
EP0098801A3 (en) * 1982-07-01 1984-07-18 Feller Ag. Line with divided low-pass filter
US4638272A (en) * 1983-05-05 1987-01-20 The Commonwealth Of Australia Lossy transmission line using spaced ferrite beads
EP0258028A3 (en) * 1986-08-25 1988-11-17 The Board Of Trustees Of The Leland Stanford Junior University Electrical cables
US6091025A (en) * 1997-07-29 2000-07-18 Khamsin Technologies, Llc Electrically optimized hybird "last mile" telecommunications cable system
US6239379B1 (en) 1998-07-29 2001-05-29 Khamsin Technologies Llc Electrically optimized hybrid “last mile” telecommunications cable system
US6684030B1 (en) 1997-07-29 2004-01-27 Khamsin Technologies, Llc Super-ring architecture and method to support high bandwidth digital “last mile” telecommunications systems for unlimited video addressability in hub/star local loop architectures

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125733A (en) * 1964-03-17 Transmission line having high attenuation for radiant
US2569667A (en) * 1946-07-18 1951-10-02 Rca Corp Electrical filter unit
US2669603A (en) * 1951-01-31 1954-02-16 Transmission line with magnetic
US2727945A (en) * 1951-01-31 1955-12-20 Lignes Telegraph Telephon High frequency magnetic elements and telecommunication circuits
US2779925A (en) * 1951-09-29 1957-01-29 Bell Telephone Labor Inc Composite coaxial resonator
US2877433A (en) * 1954-11-01 1959-03-10 Tobe Deutschmann Corp Coaxial filter
DE1103423B (de) * 1956-02-09 1961-03-30 Siemens Ag Anordnung von einem oder mehreren Leitern zur Fuehrung hochfrequenter elektromagnetischer Wellen
US3191132A (en) * 1961-12-04 1965-06-22 Mayer Ferdy Electric cable utilizing lossy material to absorb high frequency waves
US3309633A (en) * 1963-01-10 1967-03-14 Mayer Ferdy Anti-parasite electric cable
US3456215A (en) * 1964-09-02 1969-07-15 Peter A Denes High frequency low pass filter
EP0098801A3 (en) * 1982-07-01 1984-07-18 Feller Ag. Line with divided low-pass filter
US4638272A (en) * 1983-05-05 1987-01-20 The Commonwealth Of Australia Lossy transmission line using spaced ferrite beads
EP0258028A3 (en) * 1986-08-25 1988-11-17 The Board Of Trustees Of The Leland Stanford Junior University Electrical cables
US6091025A (en) * 1997-07-29 2000-07-18 Khamsin Technologies, Llc Electrically optimized hybird "last mile" telecommunications cable system
US6241920B1 (en) 1997-07-29 2001-06-05 Khamsin Technologies, Llc Electrically optimized hybrid “last mile” telecommunications cable system
US6684030B1 (en) 1997-07-29 2004-01-27 Khamsin Technologies, Llc Super-ring architecture and method to support high bandwidth digital “last mile” telecommunications systems for unlimited video addressability in hub/star local loop architectures
US6239379B1 (en) 1998-07-29 2001-05-29 Khamsin Technologies Llc Electrically optimized hybrid “last mile” telecommunications cable system

Also Published As

Publication number Publication date
BE428242A (d)

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