US1874481A - Telephone cable - Google Patents

Telephone cable Download PDF

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Publication number
US1874481A
US1874481A US400577A US40057729A US1874481A US 1874481 A US1874481 A US 1874481A US 400577 A US400577 A US 400577A US 40057729 A US40057729 A US 40057729A US 1874481 A US1874481 A US 1874481A
Authority
US
United States
Prior art keywords
wrapping
conductor
combustible
tape
strip
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
US400577A
Other languages
English (en)
Inventor
Fischer Ernst
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.)
Siemens Schuckertwerke AG
Original Assignee
Siemens Schuckertwerke AG
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 Siemens Schuckertwerke AG filed Critical Siemens Schuckertwerke AG
Application granted granted Critical
Publication of US1874481A publication Critical patent/US1874481A/en
Priority claimed from DES8809D external-priority patent/DE974932C/de
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
    • 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
    • H01B11/143—Continuously inductively loaded cables, e.g. Krarup cables using helically wound magnetic tape

Definitions

  • My invention relates to improvements in telephone cables, and more particularly in cables with continuously distributed inductive loading in which a strip or flat tape of amaterial of high permeability, such as a so-called permalloy strip, is wrapped around the conductors.
  • a strip or flat tape of amaterial of high permeability such as a so-called permalloy strip
  • My invention relates to improvements in telephone cables, and more particularly in cables with continuously distributed inductive loading in which a strip or flat tape of amaterial of high permeability, such as a so-called permalloy strip, is wrapped around the conductors.
  • difficulties arise when subjecting the strip to the necessary annealing process in order to increase its permeability, inasmuch as the magnetic strip is stretched when it cools down whereby its permeability is reduced.
  • Various means have already been suggested to eliminate this drawback, such as resilient copper conductors, a closed combustible sheath on the conductor or a recoiling of the magnetic wire
  • the stretching of the magnetic strip during the cooling after the annealing process is avoided by running a combustible thread or tape along the copper conductor when applying the Krarup winding so that the circumference of a turn of the applied magnetic material is greater than the circumference of the copper conductor.
  • This has the advantage that during the wrapping process the magnetic tape or wire may be tightly wound around the conductor and that it becomes loose during the annealing only when the combustible tape is burned. In this way the detrimental stretching of the magnetic material during the cooling is effectively avoided.
  • FIG. 1 represents a cross-section through my improved cable
  • 1 is the copper conductor, 2 the combustible thread or cord and 3 the wrapping of magnetic material.
  • a combustible tape or strip is employed, 4 is the copper conductor, 5 the combustible tape and 6 the magnetic winding.
  • Fig. 4 7 is the copper conductor, 8 and 9 are two combustible threads employed instead of the tape in Fig. 3, and 10 is the strip of magnetic material wrapped around the conductor.

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  • Insulated Conductors (AREA)
  • Soft Magnetic Materials (AREA)
US400577A 1928-10-23 1929-10-18 Telephone cable Expired - Lifetime US1874481A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE331786X 1928-10-23
DES8809D DE974932C (de) 1940-09-12 1940-09-12 Kontaktanordnung fuer Hebel- und Trennschalter

Publications (1)

Publication Number Publication Date
US1874481A true US1874481A (en) 1932-08-30

Family

ID=25810808

Family Applications (1)

Application Number Title Priority Date Filing Date
US400577A Expired - Lifetime US1874481A (en) 1928-10-23 1929-10-18 Telephone cable

Country Status (4)

Country Link
US (1) US1874481A (en(2012))
BE (1) BE364582A (en(2012))
FR (1) FR683370A (en(2012))
GB (1) GB331786A (en(2012))

Also Published As

Publication number Publication date
BE364582A (en(2012))
GB331786A (en) 1930-07-10
FR683370A (fr) 1930-06-11

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