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Publication numberUS2538019 A
Publication typeGrant
Publication dateJan 16, 1951
Filing dateJan 7, 1947
Priority dateOct 29, 1945
Publication numberUS 2538019 A, US 2538019A, US-A-2538019, US2538019 A, US2538019A
InventorsCharles Lee Edwin
Original AssigneeInt Standard Electric Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of making multicore electrical conductors
US 2538019 A
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Description  (OCR text may contain errors)

Jan. 16, 1951 E. c. LEE 2,538,019

METHOD OF MAKING MULTICORE ELECTRICAL CONDUCTORS Filed Jan. 7, 1947 Inventor [aw/Al (HA/H E: LEE

Patented Jan. 16,1951

METHOD OF MAKING MULTICORE ELECTRICAL CONDUCT'ORS' Edwin Charles Lee, London, England, assignor to International Standard Electric Corporation, New York, N. Y., a corporation of Delaware Application January 7, 1947, Serial No. 720,562 'In Great Britain October 29, 1945 Section 1, Public Law 690, August 8, 1946 Patent expires October 29, 1965 1 Claim. (Cl. 154 2.24)

This invention relates to electric cables and more particularly to multi-core electric power cables.

Paper, whether um'mprcgnated or impregnated with an insulating compound is a normal form of insulation in electric cables. The usual method of applying this form of insulation is to lap the required numbers of papers in the form of narrow strips around the conductors to form separate cores. Additional layers of paper may then be applied around the cores after they have been laid up in cable form. For high voltage cables,'say 11,000 volts and over, the papers must be applied with precision to avoid the formation of spaces within the dielectric, but for lower voltages the thickness of insulation is designed for mechanical rather than electrical considerations.

The' application of the paper insulation represents an appreciable proportion of the total cost of making the cable. In a four core cable, for example, there are five distinct lapping operations necessitating five different passes through the lapping machine. Furthermore the process is comparatively slow owing to the narrow widths of the paper tapes.

An object of the present invention is to cheapen the process of making a power cable by eliminating the lapping operations on the individual cores. 7

According to one feature of the present invention we provide a multi-core electric power cable in which the several cores are insulated from one another by means of a member extending along the length of the cable the cross section of which comprises a plurality of arms radiating from a centre, the separate conductor cores being laid between the arms.

The above-mentioned member may be formed so that the portions whose cross sections constitute the arms are helical so that the conductor cores are laid in helices, as must be the case if 2 Preferably also the flexible arms are 'made of suflicient length to enable them to be folded around the separate conductors.

The invention will be better understood from the following description of one embodiment, as applied to a four core cable, taken in conjunction with the accompanying drawings in which: Fig. 1 shows a cross section of an electric power cable in accordance With the invention.

Figs. 2, 3 and 4 show successive steps in the formation of the insulation of the cable of Fig. 1. Fig. 5 shows the form in which the insulating member of Figs. 2 to 4 may be stored.

Referring to the drawings, an electric power cable is formed with a member I having four arms radiating from the centre, so as, in the case of the four core cable illustrated, to have a cruciform cross section. This central member is formed from a plurality of superposed paper strips in the manner shown in Figs. 2 to 4. Fig. 2 shows in cross section a plurality of paper strips laid one above the other. The width 3 of the strips is sumcient to enable the formation of the arms 2 of Fig. 1. The length at right angles to the plane of the paper may be sufiicientto produce a manufacturing length of cable without jointing although there is no objection to making a joint by over-lapping the papers. The

, papers are folded lengthwise as shown in Fig. 3

the cable is to be flexible but preferably the member is of flexible material so that the process of laying up the separate conductors to form the,

included in the laying up of the conductors d to form the cable in which case the guides and supply rolls for the paper strips would be attached to the cable making machine. The paper member shown in Fig. 4 is then fed along the centre line of the machine and the copper conductors 4 guided between the limbs. The portions of the arms 2 extending beyond the conductors are then folded around the conductors, as shown in Fig. 1 by passage through a die. Fillers 5, in the form of extended folded strips of paper or jute string, folded into the cross section shown in Fig. 1 are guided into position and the assembly passed through a second die to form an approximately circular section. The effect of the fillers is to complete the turnover of the extremities of the arms 2 and to fill up the gaps at the extremities of the radial portions of these arms. Finally, on leaving the second die, the outer or belt papers 6 are applied by the usual rotating head.

During the laying up operation the conductors 4 are twisted according to normal practice and preferably are pretwisted during the stranding 3 of the individual wires, again according to normal practice.

If desired a central filler I may be inserted during the manufacture of the cable.

After the application of the belt insulation 6 a lead sheath (not shown) is applied by extrusion in the normal manner.

If desired the central member I after being formed into the shape shown in Fig. 4 may be stored, before being used in the manufacture of the cable, by being flattened into the shape shown in Fig. 5 and coiled on a drum, which drum is then mounted whenrequire'd on the laying up machine.

It is clear that the invention can readily :be applied to the manufacture of a cable of any number of cores.

What is claimed is:

A process for producing a multi-core electric power cable comprising the steps of superimposing a plurality of insulating paper strips in stacked relation, folding said stacked strips as a continuous unit into cruciform shape, laying a. plurality of conductors between the arms of said cruciform, folding each arm to completely encircle a conductor core, inserting a filler at the center from which the arms radiate and inserting peripheral fillers in the openings between the end of each arm and the nextadjacentarm.

EDWIN CHARLES LEE.

REFERENCES CITED The following references are of record in the file of this patent:

v UNITED STATES PATENTS Number Name Date 71,389,143 Kempton Aug. 30, 1921 1,663,878 Emanueli Mar. 27, 1928 2,125,869 Atkinson Aug. 9, 1938 2,264,439 Guyatt Dec, 2, 1941 FOREIGN PATENTS Number Country Date 22,923 Great Britain Aug. 12, 1893 of1892 342,606 Great Britain Feb. 5, 1931

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1389143 *Jan 25, 1919Aug 30, 1921Westinghouse Electric & Mfg CoReinforced tube and method of making it
US1663878 *Sep 2, 1925Mar 27, 1928 Luigi emanueli
US2125869 *Jul 18, 1933Aug 9, 1938Gen Cable CorpElectrical conductor
US2264439 *Jul 12, 1940Dec 2, 1941American Steel & Wire CoNonmetallic sheathed cable
GB342606A * Title not available
GB189322923A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2787653 *Feb 24, 1953Apr 2, 1957Anaconda Wire & Cable CoElectric cables
US3420720 *Nov 8, 1963Jan 7, 1969Whitney Blake CoMethod of making jacketed multi-conduction electrical cable
US3614290 *Mar 25, 1970Oct 19, 1971Anaconda Wire & Cable CoPipe-type cable comprising aluminum conductors with high-elastic-modulus tensile strands
US3819443 *Jan 15, 1973Jun 25, 1974Sun Chemical CorpMethod for making multifinned shielding tapes
US5952613 *Nov 14, 1995Sep 14, 1999Abb Industry OyConnector for connecting a three-phase cable and manufacturing method of the connector
US6288340 *Jun 10, 1999Sep 11, 2001NexansCable for transmitting information and method of manufacturing it
US6365837 *Apr 11, 2001Apr 2, 2002James D. MitchemNon-tangling line
US6379175 *Mar 25, 1999Apr 30, 2002Nordx/Cdt. Inc.Fixture for controlling the trajectory of wires to reduce crosstalk
US6596944Mar 21, 2000Jul 22, 2003Cable Design Technologies, Inc.Enhanced data cable with cross-twist cabled core profile
US6787697Jan 16, 2001Sep 7, 2004Belden Wire & Cable CompanyCable channel filler with imbedded shield and cable containing the same
US6812408May 28, 2003Nov 2, 2004Cable Design Technologies, Inc.Multi-pair data cable with configurable core filling and pair separation
US6855889Aug 13, 2001Feb 15, 2005Belden Wire & Cable CompanyCable separator spline
US6998537Jan 3, 2003Feb 14, 2006Belden Cdt Networking, Inc.Multi-pair data cable with configurable core filling and pair separation
US7015397May 27, 2003Mar 21, 2006Belden Cdt Networking, Inc.Multi-pair communication cable using different twist lay lengths and pair proximity control
US7030321Jul 28, 2004Apr 18, 2006Belden Cdt Networking, Inc.Skew adjusted data cable
US7064277Dec 16, 2004Jun 20, 2006General Cable Technology CorporationReduced alien crosstalk electrical cable
US7109424Jul 9, 2004Sep 19, 2006Panduit Corp.Alien crosstalk suppression with enhanced patch cord
US7157644Dec 16, 2004Jan 2, 2007General Cable Technology CorporationReduced alien crosstalk electrical cable with filler element
US7179999Feb 13, 2006Feb 20, 2007Belden Technologies, Inc.Multi-pair data cable with configurable core filling and pair separation
US7208683Jan 28, 2005Apr 24, 2007Belden Technologies, Inc.Twisted pairs of insulated conductors, each having a closing lay length f less than about 0.6 inches that facilitate stability under force and stresses such as bending, cornering, rigorous movement and rough handling
US7238885Mar 24, 2005Jul 3, 2007Panduit Corp.Reduced alien crosstalk electrical cable with filler element
US7244893Jun 7, 2004Jul 17, 2007Belden Technologies, Inc.Cable including non-flammable micro-particles
US7271343Feb 1, 2006Sep 18, 2007Belden Technologies, Inc.Skew adjusted data cable
US7317163Oct 12, 2005Jan 8, 2008General Cable Technology Corp.Reduced alien crosstalk electrical cable with filler element
US7317164Nov 20, 2006Jan 8, 2008General Cable Technology Corp.Reduced alien crosstalk electrical cable with filler element
US7339116Jan 18, 2001Mar 4, 2008Belden Technology, Inc.High performance data cable
US7612289Dec 19, 2007Nov 3, 2009General Cable Technology CorporationReduced alien crosstalk electrical cable with filler element
US7663061Oct 23, 2007Feb 16, 2010Belden Technologies, Inc.High performance data cable
US7696438Jan 8, 2009Apr 13, 2010Belden Technologies, Inc.Data cable with cross-twist cabled core profile
US7728228Aug 31, 2006Jun 1, 2010Panduit Corp.Alien crosstalk suppression with enhanced patchcord
US7834271 *Apr 28, 2009Nov 16, 2010Tyco Electronics CorporationCabling having shielding separators
US7897875Nov 19, 2008Mar 1, 2011Belden Inc.Separator spline and cables using same
US7964797Feb 24, 2010Jun 21, 2011Belden Inc.Data cable with striated jacket
US8030571Jun 30, 2010Oct 4, 2011Belden Inc.Web for separating conductors in a communication cable
US8319104Feb 12, 2010Nov 27, 2012General Cable Technologies CorporationSeparator for communication cable with shaped ends
US8426732 *Feb 12, 2010Apr 23, 2013Superior Essex Communications LpCommunication cable with improved member for positioning signal conductors
US8729394May 5, 2003May 20, 2014Belden Inc.Enhanced data cable with cross-twist cabled core profile
US20120267144 *Mar 28, 2012Oct 25, 2012Bernhart Allen GebsPlenum Data Cable
EP1107262A2 *Nov 21, 2000Jun 13, 2001Alcatel Alsthom Compagnie Generale D'electriciteLow-crosstalk data cable and method of manufacturing
WO2001054142A1 *Jan 16, 2001Jul 26, 2001Belden Wire & Cable CoA cable channel filler with imbedded shield and cable containing the same
Classifications
U.S. Classification156/54, 174/113.00C
International ClassificationH02G5/00
Cooperative ClassificationH02G5/00
European ClassificationH02G5/00