US3180926A - Water-proof coaxial cable with readily separable layer - Google Patents

Water-proof coaxial cable with readily separable layer Download PDF

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Publication number
US3180926A
US3180926A US162773A US16277361A US3180926A US 3180926 A US3180926 A US 3180926A US 162773 A US162773 A US 162773A US 16277361 A US16277361 A US 16277361A US 3180926 A US3180926 A US 3180926A
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Prior art keywords
coaxial cable
layer
outer conductor
readily separable
water
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Expired - Lifetime
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US162773A
Inventor
Sidney W Trill
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Phelps Dodge Copper Products Corp
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Phelps Dodge Copper Products Corp
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Priority to US162773A priority Critical patent/US3180926A/en
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Publication of US3180926A publication Critical patent/US3180926A/en
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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
    • H01B11/1869—Construction of the layers on the outer side of the outer conductor
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable

Definitions

  • coaxial cable laid under water or under wet ground resist longitudinal movement of water through the cable. It is also desirable that layers of a coaxial cable be readily separable to connect their conductors to other cables, to junction boxes, or for testing of the cable.
  • coaxial cables are'not particularly well adapted to withstand longitudinal water pressure, norare they particularly well adapted to have their layers readily separable for splicing.
  • a coaxial cable in which the insulation around the outer conductor is easily extrudable and, after extrusion, readily separable from the remainder of the cable. It is a further objective that the insulation adjacent the outer conductor provide protection against longitudinal passage of
  • a coaxial cable in which a filled compound of a mixture of polyethylene, polyisobutylene and a mineral filler, preferably powdered acid magnesium metasilicate, is extruded over or under or within the spaces of the braided outer conductor of the coaxial cable.
  • the filler renders the dielectrical material about the braid less cohesive and enables the outer conductor to be readily separated from the other portions of the cable.
  • the filler selected for this purpose should be non-hygroscopic and unsusceptible to fungus and should not increase the electrical attenuation or otherwise alter the electrical characteristics of the cable.
  • the coaxial cable comprises an inner electrical conductor 1, generally of copper wire.
  • the inner conductor 1 is surrounded by a layer 2 of electrically insulative material, preferably polyethylene which is extruded over conductor 1.
  • a covering layer 4 of a mixture of mineral filler, polyisobutylene and polyethylene surrounds the outer Patented Apr. 27, 1965 conductor 3 and is preferably extruded onto conductor 3.
  • Talc poowdered acid magnesium metasilicate
  • a preferred mineral filler although diatomaceous earth, whiting (calcium carbonate), silica (silica dioxide), or hard or soft clays (mixtures containing hydrous aluminous minerals) may be used.
  • a preferred mixture for layer 4 is polyethylene, polyisobutylene and tale, in equal proportions by weight.
  • a weather protective layer 5 preferably of extruded polyethylene containing carbon black and an antioxidant, covers layer 4.
  • an extruded layer consisting essentially of a mixture of polyethylene, polyisobutylene and suflicient mineral filler to render the extruded layer relatively non-cohesive with the outer conductor so that the outer conductor and the extruded layer are readily separable.

Description

April 27, 1965 s. w. TRILL 3,180,926
WATER-PROOF COAXIAL CABLE WITH READILY SEPARABLE LAYER Filed Dec. 28, 1961 CDPPER WIRE pomsoaurmwe L f HYENE oLggl'flgfNfeb Y 7 MIN L LER PDLYETHYLENE BRAIDED WIRE 5 CARBON eLAcIM ANTIOXIDANT INVENTOR.
SIDNEY W. TRILL United dtates Patent 3,180,926 WATER-PRUQF C(UAXIAL CABLE 'l JilTll READZLY SEPARAELE LAYER Sidney W. Trill, carsdale, NEL, assigncr to Phelps Hodge Copper Products (Importation, New Yorlr, FLY a corporation of Delaware Filed Dec. 28, 1961, Ser. No. 162,773 Claims. (6!. l74=ld7) The present invention relates to electrical cable and more particularly to an improved coaxial cable.
it is desirable that coaxial cable laid under water or under wet ground resist longitudinal movement of water through the cable. It is also desirable that layers of a coaxial cable be readily separable to connect their conductors to other cables, to junction boxes, or for testing of the cable. At the present time coaxial cables are'not particularly well adapted to withstand longitudinal water pressure, norare they particularly well adapted to have their layers readily separable for splicing.
It is an objective of the present invention to provide a coaxial cable in which the insulation around the outer conductor is easily extrudable and, after extrusion, readily separable from the remainder of the cable. it is a further objective that the insulation adjacent the outer conductor provide protection against longitudinal passage of In accordance with the present invention, a coaxial cable is provided in which a filled compound of a mixture of polyethylene, polyisobutylene and a mineral filler, preferably powdered acid magnesium metasilicate, is extruded over or under or within the spaces of the braided outer conductor of the coaxial cable. The filler renders the dielectrical material about the braid less cohesive and enables the outer conductor to be readily separated from the other portions of the cable. The filler selected for this purpose should be non-hygroscopic and unsusceptible to fungus and should not increase the electrical attenuation or otherwise alter the electrical characteristics of the cable.
Other features of the present invention will be apparent from the below detailed description of a preferred embodiment, taken in conjunction with the accompanying drawing in which the single figure is a side elevational view showing a coaxial cable embodying the present invention.
In the drawing, the coaxial cable comprises an inner electrical conductor 1, generally of copper wire. The inner conductor 1 is surrounded by a layer 2 of electrically insulative material, preferably polyethylene which is extruded over conductor 1. An outer conductor 3, preferably of braided copper wire, surrounds the insulative layer 2. A covering layer 4 of a mixture of mineral filler, polyisobutylene and polyethylene surrounds the outer Patented Apr. 27, 1965 conductor 3 and is preferably extruded onto conductor 3. Talc (powdered acid magnesium metasilicate) is the preferred mineral filler although diatomaceous earth, whiting (calcium carbonate), silica (silica dioxide), or hard or soft clays (mixtures containing hydrous aluminous minerals) may be used. A preferred mixture for layer 4 is polyethylene, polyisobutylene and tale, in equal proportions by weight.
A weather protective layer 5, preferably of extruded polyethylene containing carbon black and an antioxidant, covers layer 4.
Although the above description and the drawing relate to the use of the filled polyethylene-polyisobutylene material on the outside of the outer conductor, it is often desirable that the filled polyethylene-polyisobutylene material be applied underneath, over, and Within the interstices of the braided outer conductor 3.
Modifications may be made in the present invention within the scope of the subjoined claims.
I claim:
1. In a coaxial cable, the combination of an inner conductor, an insulative layer around the inner conductor, an outer conductor of braided wire around the insulative layer, and about the outer conductor, an extruded layer consisting essentially of a mixture of polyethylene, polyisobutylene and suflicient mineral filler to render the extruded layer relatively non-cohesive with the outer conductor so that the outer conductor and the extruded layer are readily separable.
2. The combination defined in claim 1, in which the mixture is composed of substantially equal proportions by volume of polyethylene, polyisobutylene and the mineral filler.
3. The combination defined in claim 1, in which said extruded layer substantially fills the interstices of the braid.
4. The combination defined in claim 1, in which the mineral filler is powdered acid magnesium rnetasilicatc.
5. The combination defined in claim 1, in which the mineral filler is whiting.
JOHN F. BURNS, Primary Examiner. JOHN P. WILDMAN, LARAMIE E. ASKlN,
Examiners.

Claims (1)

1. IN A COAXIAL CABLE, THE COMBINATION OF AN INNER CONDUCTOR, AN INSULATIVE LAYER AROUND THE NNER CONDUCTOR, AN OUTER CONDUCTOR OF BRAIDED WIRE AROUND THE INSULATIVE LAYER, AND ABOUT THE OUTER CONDUCTOR, AND EXTRUDED LAYER CONSISTING ESSENTIALLY OF A MIXTURE OF POLYETHYLENE, POLYISOBUYLENE AND SUFFICIENT MINERAL FILLER TO RENDER THE EXTRUDED LAYER RELATIVELY NON-COHEXIVE WITH THE OUTER CONDUCTOR SO THAT THE OUTER CONDUCTOR AND THE EXTRUDED LAYER ARE READILY SEPARABLE.
US162773A 1961-12-28 1961-12-28 Water-proof coaxial cable with readily separable layer Expired - Lifetime US3180926A (en)

Priority Applications (1)

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US162773A US3180926A (en) 1961-12-28 1961-12-28 Water-proof coaxial cable with readily separable layer

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351706A (en) * 1965-03-18 1967-11-07 Simplex Wire & Cable Co Spaced helically wound cable
US3355544A (en) * 1965-02-24 1967-11-28 Vivian G Costley Small diameter high tensile strength coaxial electrical cable
US3943271A (en) * 1974-05-06 1976-03-09 General Cable Corporation Extruded solid dielectric high voltage cable resistant to electro-chemical trees
US4701575A (en) * 1986-05-27 1987-10-20 Comm/Scope Company Jacketed cable with powder layer for enhanced corrosion and environmental protection
WO1996025782A1 (en) * 1995-02-17 1996-08-22 Bently Nevada Corporation Apparatus and method for precluding fluid wicking
US6293005B1 (en) 1999-03-01 2001-09-25 Bently Nevada Corporation Cable and method for precluding fluid wicking
US20050109753A1 (en) * 2003-11-12 2005-05-26 Jones Thaddeus M. Triaxial heating cable system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2387498A (en) * 1941-12-06 1945-10-23 Western Electric Co Coated article
US2622152A (en) * 1946-09-21 1952-12-16 Anaconda Wire & Cable Co High attenuation coaxial cable
CA508338A (en) * 1954-12-21 L. Hewitt Norman Insulated electrical conductors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA508338A (en) * 1954-12-21 L. Hewitt Norman Insulated electrical conductors
US2387498A (en) * 1941-12-06 1945-10-23 Western Electric Co Coated article
US2622152A (en) * 1946-09-21 1952-12-16 Anaconda Wire & Cable Co High attenuation coaxial cable

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355544A (en) * 1965-02-24 1967-11-28 Vivian G Costley Small diameter high tensile strength coaxial electrical cable
US3351706A (en) * 1965-03-18 1967-11-07 Simplex Wire & Cable Co Spaced helically wound cable
US3943271A (en) * 1974-05-06 1976-03-09 General Cable Corporation Extruded solid dielectric high voltage cable resistant to electro-chemical trees
US4701575A (en) * 1986-05-27 1987-10-20 Comm/Scope Company Jacketed cable with powder layer for enhanced corrosion and environmental protection
WO1996025782A1 (en) * 1995-02-17 1996-08-22 Bently Nevada Corporation Apparatus and method for precluding fluid wicking
US5876528A (en) * 1995-02-17 1999-03-02 Bently Nevada Corporation Apparatus and method for precluding fluid wicking
US6291773B1 (en) 1995-02-17 2001-09-18 Bently Nevada Corporation Apparatus and method for precluding fluid wicking
US6293005B1 (en) 1999-03-01 2001-09-25 Bently Nevada Corporation Cable and method for precluding fluid wicking
US6610932B2 (en) 1999-03-01 2003-08-26 Bently Neveda, Llc Cable and method for precluding fluid wicking
US20050109753A1 (en) * 2003-11-12 2005-05-26 Jones Thaddeus M. Triaxial heating cable system
US6943319B2 (en) 2003-11-12 2005-09-13 Msx, Inc Triaxial heating cable system

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