US2468091A - Electric cable - Google Patents

Electric cable Download PDF

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Publication number
US2468091A
US2468091A US573350A US57335045A US2468091A US 2468091 A US2468091 A US 2468091A US 573350 A US573350 A US 573350A US 57335045 A US57335045 A US 57335045A US 2468091 A US2468091 A US 2468091A
Authority
US
United States
Prior art keywords
conductor
cable
air
electric cable
close proximity
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
US573350A
Other languages
English (en)
Inventor
Bruce H Maddock
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE468896D priority Critical patent/BE468896A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US573350A priority patent/US2468091A/en
Priority to FR928306D priority patent/FR928306A/fr
Priority to GB1024/46A priority patent/GB606237A/en
Priority to CH256318D priority patent/CH256318A/de
Priority to ES0172155A priority patent/ES172155A1/es
Application granted granted Critical
Publication of US2468091A publication Critical patent/US2468091A/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
    • 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

Definitions

  • the present invention overcomes all drawbacks of these known cable constructions and provides a cable of lowest capacity.
  • the oldest constructions for electric cables provided air spaces in more or less greater distances from the cable and the space in close proximity to the conductor was occupied in a large proportion by solid material, thus lacking sufficient air space in close proximity to the conductor, the later constructions provided a larger proportion of air space in close proximity to the conductor only, which air space had far too limited radial extension. Both kinds of constructions did not provide, therefore, entirely satisfactory results.
  • the present invention is based on a newly found principle, according to which suflicient air space in close proximity to the conductor and also suificient radial extension of that air space are essential in order to achieve the desired results for high frequency cables.
  • the object of the present invention to provide an electric cable which is constructed for particularly low capacity to be used substantially for high frequency purposes.
  • Figure 1 is a cross section of an electric cable
  • Fig. 2 is a longitudinal section along the lines 2-2 of Fig. 1.
  • the cable comprises a central wire conductor l around which is wound insulating spacing 2.
  • the latter has preferably theform of an open helix of relatively long pitch, through any other form can be used for the spacing means, and consists of any convenient insulating plastic material as preferably of the lowloss type such as polyethylene, polystyrene, or compounds which may include these, or equivalent materials.
  • a cylindrical jacket 3 having inwardly directed radial webs 4 each of which engages the insulating helix 2 merely at a few points which are distanced by the predetermined pitch of the helix 2, whereas the remaining portions of the inner ends of the webs I are spaced by an air gap 5 from the conductor I.
  • the helix 2 engages any point of the conductor I only on a part of its periphery.
  • the cylindrical jacket 3 and the webs l are preferably of the same insulating plastic material as described before for the helix 2. Whereas four webs are shown, it is obvious that a fewer or greater number can be employed.
  • the construction according to the present invention substantially increases the radial length of the average air gap around the conductor, which air gap comprises two connected air zones, namely, one inner zone achieved by the spacing means and an outer zone which is achieved by a plurality of air spaces formed by the cylindrical jacket 3 and each pair of adjacent webs 4.
  • This increase of the radial length of the average air gap around the conductor is achieved without in creasing the portion of solid insulating material in close proximity to the conductor while at the same time adequately mechanically supporting the center conductor.
  • an electriccable of the type including a central conductor, electrically insulating means surrounding said conductor that comprises a cord of low loss insulating material wound therearound in the form of an open helix of relatively long pitch, and a tubular member of low loss insulating material surrounding said central conductor and the cord wound therearound but retained in spaced relationship thereto by longitudinally extending ribs, formed integrally with and extending radially inwardly from the interior wall of said tubular member, said ribs tapering inwardly and pressing against the helically wound cord but not against the central conductor.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
US573350A 1945-01-18 1945-01-18 Electric cable Expired - Lifetime US2468091A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE468896D BE468896A (enrdf_load_stackoverflow) 1945-01-18
US573350A US2468091A (en) 1945-01-18 1945-01-18 Electric cable
FR928306D FR928306A (fr) 1945-01-18 1946-01-04 Câble électrique
GB1024/46A GB606237A (en) 1945-01-18 1946-01-11 Electric cable
CH256318D CH256318A (de) 1945-01-18 1946-01-14 Kapazitätsarmes elektrisches Kabel mit Innen- und Aussenleiter.
ES0172155A ES172155A1 (es) 1945-01-18 1946-01-14 Mejoras en cables eléctricos

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US573350A US2468091A (en) 1945-01-18 1945-01-18 Electric cable

Publications (1)

Publication Number Publication Date
US2468091A true US2468091A (en) 1949-04-26

Family

ID=24291628

Family Applications (1)

Application Number Title Priority Date Filing Date
US573350A Expired - Lifetime US2468091A (en) 1945-01-18 1945-01-18 Electric cable

Country Status (6)

Country Link
US (1) US2468091A (enrdf_load_stackoverflow)
BE (1) BE468896A (enrdf_load_stackoverflow)
CH (1) CH256318A (enrdf_load_stackoverflow)
ES (1) ES172155A1 (enrdf_load_stackoverflow)
FR (1) FR928306A (enrdf_load_stackoverflow)
GB (1) GB606237A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998472A (en) * 1958-04-23 1961-08-29 Lewis A Bondon Insulated electrical conductor and method of manufacture

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191116542A (en) * 1911-07-18 1912-07-18 Willoughby Statham Smith Improvements in the Covering of Electric Conductors with Plastic Material and in Apparatus therefor.
US2197616A (en) * 1936-04-29 1940-04-16 Siemens Ag Air-space insulated conductor
US2204737A (en) * 1937-10-14 1940-06-18 Ici Ltd Manufacture of electric cables

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191116542A (en) * 1911-07-18 1912-07-18 Willoughby Statham Smith Improvements in the Covering of Electric Conductors with Plastic Material and in Apparatus therefor.
US2197616A (en) * 1936-04-29 1940-04-16 Siemens Ag Air-space insulated conductor
US2204737A (en) * 1937-10-14 1940-06-18 Ici Ltd Manufacture of electric cables

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998472A (en) * 1958-04-23 1961-08-29 Lewis A Bondon Insulated electrical conductor and method of manufacture

Also Published As

Publication number Publication date
CH256318A (de) 1948-08-15
FR928306A (fr) 1947-11-25
BE468896A (enrdf_load_stackoverflow)
GB606237A (en) 1948-08-10
ES172155A1 (es) 1946-02-16

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