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Publication numberUS3829603 A
Publication typeGrant
Publication dateAug 13, 1974
Filing dateApr 26, 1973
Priority dateApr 26, 1973
Publication numberUS 3829603 A, US 3829603A, US-A-3829603, US3829603 A, US3829603A
InventorsHansen T, Moran T
Original AssigneeAnaconda Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Power cable with grounding conductors
US 3829603 A
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Description  (OCR text may contain errors)

United States Patent 1191 Hansen et a1. Aug. 13, 1974 [54] POWER CABLE WHTH GROUNDING 2,258,687 10/1941 Peterson 174/115 CQNDUCTQRS 3,614,300 10/1971 Wilson 174/115 3,644,659 2/1972 Campbell 174/116 X Inventors: Theodore Hansen; Thomas 3,707,595 12/1972 Plate 174/115 Moran, both of Marion, lnd. OTHER PUBLICATIONS [73] Asslgneel The Anaconda Company New G. Kardos, Development of Plastics Cables in Hun- York gary, Electrical Times, Vol. 161, No. 5, Feb. 3, 1972 [22 Filed: Apr. 26, 1973 1 1 PP NOJ 354,813 Primary Examiner-Arthur T. Grimley Attorney, Agent, or FirmVictor F. Volk [52] US. Cl 174/115, 174/36, 174/116 [51] lint. C1. 1101b 7/18, HOlb 9/02 ABSTRACT [58] Field of Search 174/ 1 15, 1 16, 1 13 R, 36, A power cable with uninsulated grounding conductors 174/ 102 R, 105 R, 106 R in the interstices between the insulated conductors has a helical winding of grounding wires. The grounding [56] References Cited conductors are urged into contact with the helical UNITED STATES PATENTS wires by beddings of resilient filler material.

1,904,472 4/1933 Kent 174/1 16 X 6 Claims, 2 Drawing Figures POWER CABLEWITH GROUNDING CONDUCTORS BACKGROUND OF THE INVENTION In electric cables with grounding conductors it has been known to fit the grounding conductors into the interstices of the insulated conductors when the cable is stranded. Such a construction is disclosed for a mining machine cable in Hansen and Wilson US. Pat. No. 3,699,238 wherein the spaces of the interstices over the grounding conductor are rounded out with neoprene filler. When one of these grounding conductors opens at some point, and this eventually happens in cables that are subjected to repeated severe flexing, it no longer shares the load of any grounding current, and, of course, when all the grounding conductors have opened, the cable is no longer grounded.

SUMMARY We have invented a cable, and particularly a flexible cable wherein a grounding conductor in an interstice may open at one or more points, and still function to carry grounding current. In fact, all the grounding conductors may be open at some points without ungrounding the present cable which comprises a plurality, such as but not limited to, three, of insulated power current conductors, stranded together; a plurality of strands of resilient filler material, which may comprise outwardly facing grooves, laid in interstices between the insulated conductors; and a plurality of uninsulated grounding conductors laid in the interstices over the strands. These are supported in the grooves when the strands comprise grooves. Our cable also comprises at least one uninsulated grounding wire wound helically around the insulated and the grounding conductors which latter are urged outwardly by the filler strands against the grounding wire, and an abrasion-resistant jacket surrounding the grounding wire.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 shows a section of a cable of our invention. FIG. 2 shows a partial section of the cable of FIG. 1 comprising an alternative filler strand.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT A cable, indicated generally by the numeral 10, shown in FIG. 1, applies the improvement of our invention to the flexible mining machine cable disclosed in US. Pat. No. 3,699,238, incorporated herein by reference. The cable has 3 flexible-stranded 4/0 Awg tinned-copper conductors 11, 12, 13 with respective 80-mil walls of insulation 14, 15, 16 to comprise insulated power current conductors designated 17, 18, 19. The insulated conductors 17-19 are triplexed together with a left hand lay providing interstices 21, 22, 23 and a central opening 24 containing an insulated ground check strand 26. At the base of the interstices 21-23 we have laid resilient filler strands 27, 28, 29 which are conveniently formed by extruding rods of neoprene or rubber. Other materials such as twisted fibers can be used for the strands 27-29 so long as they have sufficient nerve or resiliency to continue to recover from compression for indefinite periods of time. Pasty materials or materials that are plastic in the sense that they are subject to permanent compressive deformation are not suitable for the strands '27-29. Over the strands 27-29 within the interstices 21-23 we have laid three 3 Awg grounding conductors 31, 32, 33 stranded from tinned copper wires. The size of the strands 27-29 is selected sufficiently large to project the surfaces of the conductors 31-33 radially outwardly of the circle inscribing the conductors 17-19. The illustrated cable It) is constructed to have a cylindrical outer surface. Where circularity of the cable section is not required it is at least necessary that the surfaces of the conductors 31-33 project beyond the tangent lines connecting the surfaces of the insulated conductors so that these surfaces will be urged against any wrappings that are applied around the assembled conductors. Where, as in the present cable 10, it is desired to produce a cylindrical cable, additional filler material, not necessarily resilient, may be added such as filler strands 34.

A grounding wire 36 is helically wrapped over the insulated conductors 17-19 and grounding conductors 31-33 making permanent electrical contact with the latter.

The act of wrapping the wire 36, or a plurality of such wires, compresses the adially projecting grounding conductors 31-33 into the esilient filler strands 27-29 hich thereafter maintain a pressure of the grounding conductors against the grounding wire. The wire 36 is one of seven 28 Awg wires wound in parallel with a right hand lay. It might, however, within the scope of our invention be comprised in a braided tape, or take the form of a flat wire of substantial width. The essential feature of the wires 36 is that they comprise a large plurality of electrically conducting members connecting the conductors 31-33 circumferentially at many points along the cable 10.

Over the wires 36 we have wrapped a fiber reinforced conventional binder tape 37 and extruded a neoprene or other abrasion resistant jacket 38. This is surrounded by an open weave nylon seine twine reinforcing web 39 and a second abrasion resistant extrusion 41.

In the embodiment of FIG. 2 a resilient filler strand 42 has been extruded in a shape providing a lengthwise groove 43 to support the grounding conductor 31. The strand 42 has a restricted section 44 that nests into the base of the interstice 21 and comprises more positive means of securing the continued proper positioning of the grounding conductor against the grounding wires 36. The number of strands 42 used in any cable will equal the number of interstices bearing grounding conductors.

In the manufacture of the cable 10 it is economical to apply the grounding wires 36 with the same length of lay and in the same operation as that for the application of the tape 37 and, indeed, the wires 36 may first have been bonded against the underside of the binder tape.

The foregoing description has been exemplary, rather than definitive, of the cable of our invention for which we desire an award of Letters Patent as defined in the appended claims.

We claim:

1. A power cable comprising:

A. a plurality of insulated power current conductors stranded together, interstices being formed between adjacent of said conductors,

B. a plurality of strands of resilient filler material laid in said interstices,

C. a plurality of uninsulated grounding conductors laid in said interstices over said strands,

D. at least one uninsulated grounding wire wound helically around said insulated conductors and said grounding conductors, said grounding conductors 5 being urged outwardly by said strands against and in electrical contact with said grounding wire, E. an abrasion-resistant polymeric jacket surrounding said grounding wire. 2. The cable of claim 1 wherein said plurality of insulated conductors is three.

grounding conductors is three.

l= l l

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3993860 *Aug 18, 1975Nov 23, 1976Samuel Moore And CompanyElectrical cable adapted for use on a tractor trailer
US4533790 *Mar 13, 1984Aug 6, 1985Akzona IncorporatedElectrical conductor assembly
US4552432 *Apr 21, 1983Nov 12, 1985Cooper Industries, Inc.Hybrid cable
US4588852 *Dec 21, 1984May 13, 1986Amp IncorporatedStable impedance ribbon coax cable
US4707569 *May 23, 1986Nov 17, 1987Japan Styrene Paper CorporationMulti-conductor cable
US4719319 *Mar 11, 1986Jan 12, 1988Amp IncorporatedSpiral configuration ribbon coaxial cable
US4866842 *Sep 30, 1988Sep 19, 1989Amp IncorporatedMethod of making a shielded cable harness
US4958333 *Jan 12, 1989Sep 18, 1990Southwest Research InstituteShielding for seismic cables
US5110999 *Dec 4, 1990May 5, 1992Todd BarberaAudiophile cable transferring power substantially free from phase delays
US5113040 *Feb 13, 1991May 12, 1992Siemens AktiengesellschaftFlexible electrical cable having two stranded conductors
US5218167 *Sep 17, 1990Jun 8, 1993Gasque Jr Samuel NCable assembly with lightning protection
US5416269 *Nov 1, 1993May 16, 1995Raychem CorporationInsulated cable and method of making same
US5834699 *Sep 10, 1997Nov 10, 1998The Whitaker CorporationElectrical cable
US6030346 *Apr 29, 1998Feb 29, 2000The Whitaker CorporationUltrasound imaging probe assembly
US6117083 *Apr 30, 1998Sep 12, 2000The Whitaker CorporationUltrasound imaging probe assembly
US7060905 *Nov 21, 2001Jun 13, 2006Raytheon CompanyElectrical cable having an organized signal placement and its preparation
US7754969Mar 12, 2008Jul 13, 2010Southwire CompanyArmored cable with integral support
US7880089Jun 13, 2008Feb 1, 2011Southwire CompanyMetal-clad cable assembly
US8088997 *Apr 7, 2009Jan 3, 2012Wpfy, Inc.Metal sheathed cable assembly
US8658900Apr 7, 2009Feb 25, 2014Wpfy, Inc.Metal sheathed cable assembly
US8664532Jan 6, 2011Mar 4, 2014Southwire CompanyMetal-clad cable assembly
US8697996Jun 14, 2010Apr 15, 2014Southwire CompanyArmored cable with integral support
US20100270054 *Apr 14, 2010Oct 28, 2010Hitachi Cable, Ltd.Cable
US20120073855 *Dec 8, 2011Mar 29, 2012Wpfy, Inc.Metal sheathed cable assembly
WO2008154116A1 *May 16, 2008Dec 18, 2008Paul H WhiteArmored cable with integral support
WO2009069078A2 *Nov 25, 2008Jun 4, 2009Schlumberger Ca LtdSmall-diameter wireline cables and methods of making same
Classifications
U.S. Classification174/115, 174/36, 174/116
International ClassificationH01B9/00, H01B9/02
Cooperative ClassificationH01B9/025, H01B9/028
European ClassificationH01B9/02E, H01B9/02H
Legal Events
DateCodeEventDescription
Feb 25, 1985ASAssignment
Owner name: ANACONDA ACQUISITION CO., 17 SQUADRON BOULEVARD, N
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ERICSSON, INC., A CORP OF DE;REEL/FRAME:004364/0732
Effective date: 19850215
Feb 9, 1981ASAssignment
Owner name: ANACONDA-ERICSSON INC., A CORP. OF DE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ANACONDA COMPANY, THE A CORP. OF DE;REEL/FRAME:003846/0822
Effective date: 19800728
Owner name: ANACONDA-ERICSSON INC., A CORP. OF,DELAWARE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ANACONDA COMPANY, THE A CORP. OF DE;REEL/FRAME:3846/822
Owner name: ANACONDA-ERICSSON INC., A CORP. OF, DELAWARE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ANACONDA COMPANY, THE A CORP. OF DE;REEL/FRAME:003846/0822