US1623555A - Loaded signaling conductor - Google Patents

Description

1 62 ,555 Aprll 5, 1927. J. G ROBERTS 3 LOADED SIGNALING CONDUCTOR Filed Aug. 16. 1921 Wye/722w: 51/0/70 6-? Hake/f5,

Patented Apr. 5, 1927.

UNITED STATES PATENT OFFICE".

JOHN G. noEEn'rs, or nonns FERRY, :uEw YORK, assrenon "1'0 WESTERN ELECTRIC comraNY, mconrona'rnn, on NEW YORK, n. Y., A conroae'rron on NEW JERSEY.

LOADED SIGNALING CONDUCTOR.

Application filed August 1 6,-1821. Serial No. 492,748.

This invention relates to loaded signaling conductors and particularly to continuously loaded conductors suitablefor submarine cables.

5 An object ofthe invention is to provide a stranded signaling conductor on which the tral wire lsurrounded by six wires 2. The

" conductor ispreferably formed by stranding the outer'wires around the central wire 1.

Such a conductor has proven to be desirable in order that thecable may be as flex- .ible as possible and thus reduce any tendency to become-disrupted either during the proc-, v ess of laying or while in actual use-.. Instead of employing a conductor like that shown in the drawing, it may be desirable for part-icu lar purposes to employ other well known types of cable conduttors, such, for example,

ployed or one employing a core of insulating material. ,7 7 In a plying continuous loading to this sort of a conductor when iron is used as the loadin material, the tape or wire is wrapped t ereabouts, touching the composite conductor atrelatively few points. Uponqthe submer'gence of the cable, the excesfiwires, causing strains and stresses to be set up in the magnetic. material. Such strains and stresses do not materially affect the per meability of the iron; and for this reason the chan e in position of the tape or wire is not 0 any great moment.

It has been found, however, that when material of high permeability at low magchange of position seriously impairs its magnetic properties due to the excessive strains and st set up therein. This invention provides a method of so positioning the load- .somewhat as regards temperatures employed as a structure in which no central core is em-' si'vewater pressure forces the loading material into the interstices between the outer.

netizing forces is employed, such as for ex-- ample, certain alloys of nickel and iron, this u ing material about the conductor that no change in position thereof relative to the conductor, results from the submergenceof the cable, thus preventing any impairment in the permeability of the magnetic material.

In accordance with the invention, the magnetic tape or wire 3 is initially compressed about the conductor, so that its inner surface is substantially at all points in contact with. the conductor. This may be accomplished in a variety of ways, the preferred method being to draw the conductor after the loading material has been applied, through a suitable the which will force'the tape or wire into the interstices between the outer wires. When this is done the contour of the magnetic material conforms to the contour of the conductor. The loading wire or tape is preferably well annealed before wrapping so that it will conform readily to its new position when passed through the. die.

To develop the utmost permeability in the magnetic material-the loaded conductor may. be subjected to a heat treatment,;the treatment required in'any particular case varying and duration of heating and cooling. The optimum values of these variables may be readily determined in any specific case by experiment. After the heat treatment, the material should be guarded against any considerable str ains.

After the heat treatment, insulating material 4, such as gutta percha, is applied to the loaded conductor in accordance with the usual method of. insulating submarine con- 00 ductors. Loading materials as referred to hereinbefore are described in the patent to- Elmen No. 1,586,884, granted June ,1, 1926.

What is claimed is 1. A signaling conductor having an uneven surface, and a layer of magnetic material wrapped spirally about the conductor and pressed into intimate mechanical contact therewith toconform to the surface of the conductor. 1

,2. The method of l'oading asig'nalin' jcon ductor having a, plurality vof cylindricah wires, which comprises wrapping the conductor helically wit magnetic material and forcing said material into intimate contact 105 with substantially the entire exterior surface of said 'conduc r. r

3. The method of loading a signaling conductor having a' plurality of cylindrical wires, which comprises helically wrapping the conductor with a layer of loading material and shaping the loading material to con form to the contour of said conductor.

4. The method of applying a magnetic sheath to a stranded conductor, which comprises wrapping said conductor with a helical covering of magnetic tape, and compressing said magnetic tape into the crevices between the strands of the conductor so that the magnetic sheath conforms to the contour of the conductor.

5. A signaling conductor comprising a plurality of wires stranded together and having a continuous stri of magnetic material wrapped helically a out said conductor and compressed into the interstices thereof.

In witness whereof, I hereunto subscribe my name. this 10th day of August, A. D.,

JOHN G. ROBERTS.

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