US3639864A - Transportable coaxial cable - Google Patents

Transportable coaxial cable Download PDF

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Publication number
US3639864A
US3639864A US866314A US3639864DA US3639864A US 3639864 A US3639864 A US 3639864A US 866314 A US866314 A US 866314A US 3639864D A US3639864D A US 3639864DA US 3639864 A US3639864 A US 3639864A
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Prior art keywords
cable
rigid
coaxial cable
flexible
transportable
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Expired - Lifetime
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US866314A
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English (en)
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Bernt Klostermark
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Individual
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Individual
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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
    • H01B11/1878—Special measures in order to improve the flexibility

Definitions

  • ABSTRACT E f 2 Coaxial cable for connection between an antenna and a 174 lgsA receiver in nonpermanent or mobile installations.
  • the cable is joined by short lengths of bendable sections thereby enabling the cable to be folded into an easily transportable unit.
  • Another disadvantage of a cable which is wound on a drum is, that it is affected by extraneous magnetic fields.
  • EMF-effect a very strong, short-lasting magnetic field is generated (the so called EMF-effect), which within a radius of several kilometers from the place of the explosion can damage a cable which is wound on a drum.
  • An object of the present invention is to provide a coaxial cable, in which the risk for unallowable bending stresses in difficult field conditions is eliminated, and which it is not necessary to keep on a voluminous cable drum, which is susceptible to disturbing magnetic fields.
  • the invention relates to a transportable coaxial cable, which is mainly characterized by the fact, that it comprises a plurality of equally long pieces or sections of rather rigid coaxial cable and intermediate pieces or sections of rather easily bendable cable, said intermediate pieces being connected to the pieces of rigid cable by electrical connections, which electrically connect partly the inner conductors or cores of the different cables and partly the outer conductors or mantles of said cables, as well as by mechanically strong connections, which take up mechanical loads.
  • FIG. 1 shows a short piece of a transportable cable according to the invention
  • FIG. 2 shows a longitudinal section of a joint between a rigid piece of cable and a bendable piece of cable according to an embodiment of the invention
  • FIG. 3 shows an intersection of a joint between a rigid and a bendable piece of cable according to another embodiment of the invention.
  • FIG. 4 shows in a much smaller scale a complete cable, which comprises several rigid pieces and several bendable pieces of cable as well as connection devices at the ends, said cable being folded 180 and tied up in an easily transportable bundle.
  • the cable which is shown in FIG. 1 comprises a number of practically unbendable, rigid cable pieces or sections 1, as well as a number of rather easily bendable cable pieces or sections 2, which are connected to the rigid cable pieces 1 by permanent joints 3.
  • the cable may naturally comprise an arbitrary number of each such pieces.
  • the cable pieces 1 should be considerably longer than the cable pieces 2, so that the total attenuation of the cable will be only slightly lower than the attenuation of an equally long cable, which would comprise one single piece, said piece being of the same kind as each of the cable pieces I.
  • the cable pieces 1 and 2 should have the same electrical characteristics, i.e., the same impedance, so that reflections at the joints 3 will be avoided.
  • the rigid cable pieces 1 can comprise an inner conductor or core 4, which consists of a rather unbendable or rigid copper bar or copper tube, as well as in outer conductor or mantle 5, which can be a rather unbendable or rigid copper pipe.
  • both the inner conductor 4 and the outer conductor 5 customarily have cylindrical shapes.
  • insulation is arranged, which may fill the intermediate space or alternatively may consist of insulating washers 6, two of said washers being shown in each of the FIGS. 2 and 3.
  • an outer insulation 7 of polyvinyl chloride or the like is arranged. At the joint said insulation 7 is stripped off as illustrated, so that it ends at 8.
  • the easily bendable cable 2 may comprise an inner conductor or core 9 of a multicore copper wire, said wire being surrounded by a mantle with the shape of a sleeve of metal braid 10 or the like. On the outside of the mantle an insulation is arranged, which is indicated by 11. This'insulation is stripped off at the joint and ends at 12. As in the cable 1 the core 9 may be centrally held in the mantle 10 by either a solid insulation or by insulating washers 13, which are spaced from each other. At the joint 3 a hole is drilled in the core 4 of the rigid cable 1, and the core 9 of the bendable cable 2 is inserted in said hole as is shown at 14. The core 4 of the rigid cable 1 may squeeze the core 9 of the bendable cable 2, or said cores may be soldered together at the joint 14.
  • the mantle or sleeve 10 of the bendable cable 2 is furthermore stretched out and slipped over the end part of the mantle 5 of the rigid cable I, said part projecting outside the insulation 7, as is shown at 15.
  • the sleeve of metal braid 10 may be soldered to the mantle 5 or be squeezed by tie wire or the like.
  • the joint On the outside of the joint, which is thus formed between the points 8 and 12, the joint may be surrounded by an insulation, which is indicated by 15, and which may comprise a tape, which is wound on it, or a shrinkable or slotted insulating tube, said tube being possibly at first thread over for example the cable piece 2' and thereafter being moved back onto the joint.
  • an outer insulation 17 of for example PVC-plastic is arranged, which hermetically seals the different joints of the cable. Said PVC-plastic will be arranged when the joints of the cable arecompleted and will extend from the one end of the completed cable to the other.
  • the mantle of the bendable cable 2 is cut off at 18. It does not have to be a sleeve of metal braid but may comprise for example a wrapping, consisting of a tape which is wound with overlapping.
  • a special sleeve of-metal braid 19 is in said embodiment thread over the whole bendable cable piece 2 and arranged so as to extend over and past the two joints 3, by which joints the bendable cable 2 is connected to the adjacent, rigid cable pieces 1.
  • the sleeve ofmetal braid 19 is electrically and mechanically connected (for example by soldering) to the free mantle ends 20 of the rigid cable pieces 1 as well as to the stripped off ends 21 of the mantle of the bendable cable 2.
  • the rest of the sleeve of metal braid 19 is located on the insulation 11 of the bendable cable 2, which is shown to the right in FIG. 3.
  • the sleeve of metal braid 19 forms an electrical connection between the mantles of the different cable pieces. At the same time said sleeve forms such a mechanical connection, which absorbs mechanical loads in the longitudinal direction of the cable, which loads may occur between the rigid cable pieces.
  • the sleeve of metal braid 19 can be a so called pulling sleeve of a kind known per se, i.e., a braided sleeve of a springy wire, which is compressive in its longitudinal direction and whose diameter increases by compression.
  • a sleeve is often made of a ferromagnetic or some other material, which is not suitable for transmission of high-frequency electrical energy. Therefore in such cases a sleeve of copper braid (not shown) should be arranged on the inside of the pulling sleeve.
  • a cable can be used which has no insulation on the outside of the outer conductors (the mantle).
  • the cable will be provided with a continuous outer insulation 17 of plastic or rubber which may provide a hermetical cover.
  • an insulation block 24 can be arranged around the joint 14, if desired.
  • This insulation can comprise an insulating body, which may be divided into two halves and arranged around the joint, or moulded around the joint by a special tool.
  • the insulating body may either be solid or provided with grooves or recesses (radial or axial), for decreasing the dielectric constant of the insulating body to a suitable value.
  • the joint 14 does not have to be the kind, which has been described in connection with the shown embodiments.
  • the joint may alternatively comprise a jointing tube, in whose two ends the ends of the cores 4 and 9 have been inserted and soldered or squeezed.
  • FIG. 4 shows how a cable according to the invention has been folded 180 to an easily transportable bundle, which is kept together by straps 22.
  • several sections of the rigid coaxial cable 1, all having substantially equal lengths, are shown connected together by sections of flexible or bendable cable 2.
  • the bendable sections allow for 180 bending, as illustrated.
  • a coaxial cable according to the invention may naturally be provided with coaxial connections 23 at its ends, so that it will be easy to connect between for example an antenna and a transmitter or receiver.
  • the cable may at its ends be provided with bendable parts, on which coaxial connections are arranged in order to facilitate the connection of the cable and to make the cable bendable close to the connections.
  • a transportable coaxial cable for use as a transmission line for radiofrequency signals comprising a plurality of rigid sections of coaxial cable having a solid central conductor and an outer conductor, with the ends of said rigid sections being joined by a section of flexible coaxial cable having a multiplewire central conductor and a flexible cylindrical outer conductor, and joints electrically and mechanically connecting adjacent ends of said rigid and flexible sections together, each joint comprising: 7
  • insulation means extending from the outer surfaces of the rigid and flexible cable sections covering the joint.
  • Transportable coaxial cable according to claim 1 wherein the outer conductor of the rigid cable section is cylindrical and said length of flexible cable is spread over the adjacent end an of said outer conductor on the rigid cable section.
  • ransportable coaxial cable according to claim 1 wherein the length of braided flexible cable is a separate member which extends over and is electrically and mechanically secured to the outer conductors of both the rigid cable section and the flexible cable section, said separate member comprising a braided sleeve of springy wire which when compressed increases in diameter and when placed under tension decreases in diameter.
  • Transportable coaxial cable according to claim 1 wherein the rigid sections are disposed in parallel side-by-side relationship with the flexible sections having a reverse bend of l, and means securing the rigid sections together for easy transport of the coaxial cable.
  • Transportable coaxial cable according to claim 1 having at least four sections of coaxial cable, conventional terminals at opposite ends of the cable, and a unitary sleeve of insulating material extending the full length of the cable between the connectors to thereby provide a hermetically sealed cable.
  • Transportable coaxial cable comprising a plurality of equally long pieces (1) of rather rigid coaxial cable composed of an inner conductor and an outer conductor and intermediate pieces (2) of rather easily bendable coaxial cable composed of an inner conductor and an outer conductor, said intermediate pieces being connected to the pieces of rigid cable by joints (3) comprising electrical connections which electrically connect together both the inner and outer conductors of the rigid and flexible coaxial cables and mechanical connections, with the said pieces of rigid coaxial cable and said pieces of bendable coaxial cable having substantially the same electrical impedance.

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  • Communication Cables (AREA)
  • Waveguide Aerials (AREA)
US866314A 1968-10-22 1969-10-14 Transportable coaxial cable Expired - Lifetime US3639864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE14245/68A SE317424B (en, 2012) 1968-10-22 1968-10-22

Publications (1)

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US3639864A true US3639864A (en) 1972-02-01

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US866314A Expired - Lifetime US3639864A (en) 1968-10-22 1969-10-14 Transportable coaxial cable

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US (1) US3639864A (en, 2012)
DE (1) DE1934550A1 (en, 2012)
GB (1) GB1250430A (en, 2012)
SE (1) SE317424B (en, 2012)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245745A1 (de) * 1972-08-23 1974-02-28 Bbc Brown Boveri & Cie Aus geraden teilstuecken zusammengesetzte elektrische hochspannungsleitung
US5561640A (en) * 1995-05-22 1996-10-01 The United States Of America As Represented By The Secretary Of The Navy Multi-section sonar array cable
US5565652A (en) * 1995-01-24 1996-10-15 Frye; Filmore O. Electrical power transmission line
JP2006156051A (ja) * 2004-11-26 2006-06-15 Yazaki Corp 高圧用ワイヤーハーネス
CN103260957A (zh) * 2010-12-10 2013-08-21 矢崎总业株式会社 线束

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464598A (en) * 1943-08-30 1949-03-15 Gen Electric Flexible section for wave guides

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464598A (en) * 1943-08-30 1949-03-15 Gen Electric Flexible section for wave guides

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245745A1 (de) * 1972-08-23 1974-02-28 Bbc Brown Boveri & Cie Aus geraden teilstuecken zusammengesetzte elektrische hochspannungsleitung
US5565652A (en) * 1995-01-24 1996-10-15 Frye; Filmore O. Electrical power transmission line
US5561640A (en) * 1995-05-22 1996-10-01 The United States Of America As Represented By The Secretary Of The Navy Multi-section sonar array cable
JP2006156051A (ja) * 2004-11-26 2006-06-15 Yazaki Corp 高圧用ワイヤーハーネス
US20060278423A1 (en) * 2004-11-26 2006-12-14 Yazaki Corporation High-voltage wire harness
US7563981B2 (en) * 2004-11-26 2009-07-21 Yazaki Corporation High-voltage wire harness
CN103260957A (zh) * 2010-12-10 2013-08-21 矢崎总业株式会社 线束
CN103260957B (zh) * 2010-12-10 2016-04-20 矢崎总业株式会社 线束

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Publication number Publication date
DE1934550A1 (de) 1970-08-27
SE317424B (en, 2012) 1969-11-17
GB1250430A (en, 2012) 1971-10-20

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