US1760409A - Cable - Google Patents

Description

Patented May 27, 1930 uuiran srarss PATENT QFFECE MASSACHUSETTS, ASSIGNOR TO IKE AMERI- 01 NEW JERSEY, A. COBYOBATION 01 NEW CABLE Application filed April 18, 1921. Serial No.462,832.

My invention relates to cables, and while not limitedthereto, relates particularly to bare conductor cables used principally for high tension electrical power transmission,

5 and has for one of its objects the provision of such. a cable having a large diameter, and a smooth cylindrical outer surface combined with a, maximum of strength.

Another object is to provide a cable of the above class having its periphery formed of suitable materials having a high conductivity, such as copper or the like.

Still another object is to protect the inner strands or core of the cable from moisture,

gas fumes, and other deteriorating elements.

In the drawings illustrating my invention, Figure 1 is an elevation, partly broken away, of a portion of cable constructed in accordance with my invention.

Figure 2 is a cross sectional elevation of the cable of Figure 1.

Figure 3 is a view similar to Figure 1, of a modified construction of cable having a conductive wrapping of novel cross section.

Referring particularly to the drawings, the cable consists of a central strand or core A, composed. of a plurality of wires 2 having a high tensile strength, such as steel, which are laid up in any well known manner to give a maximum of strength.

The core A is surrounded or wrapped with one or more layers or thicknesses of ribbonlike wires or conductors 3, having a high conductivity. The wires 3 are wrappe helically over the core A, and as shown in Figure 1, are of rectangular cross section, and are offset with relation to each other so that the longitudinal center line of the outer layer will overlie the interstices between the coils of the under layer, thus forming a continuous, smooth external surface that will have a maximum of conductivity, and will protect the inner core or strand of the cable from gas, moisture and other deteriorating elements.

In the modified form of Figure 3, the ribhon-like wires or conductors 3 have substanti ally a Z-shaped cross section. That is, they have a stepped formation, one half 3 being on a plane below the other half 3*, so that Kill when they are wound or laid on the core A in a spiral formation, the lower half 3* of the one wire 3 will underlie the upper half 3 of the other wire 3. That is, the upper half 3 of one wire will overlie the lower half of the other wire 3 and the interstices between the wires.

Any desired ratio of conducting material, such as copper, to supporting material, such as steel, may be had by arranging the wires or conductors 3 and the cable strands 2.

A particular advantage of this cable is that its smooth outer conducting surface reduces the corona loss to a minimum.

If desired to further protect the core A of my cable from the destructive effects of moisture, gas fumes, etc., the wires 2 of the core may be coated with zinc, tin, lead, or the like.

I claim i 1. A hi h tension cable conductor comprising a su stantially circular stranded core composed of a plurality of ferrous metal strands of relatively high strength and low conductivity, and a surrounding covering of at least two helically wound copper strips, said strips being overlapped so that the edges of one strip will be offset with relation to the edges of the other strip and so that said covering will be composed of two layers of said strips throughout its length, and said stri s being unsecured to each other and to sai core to ermit free flexing of the cable.

2. A hig tension cable conductor comd prising a substantially circular stranded core composed of a plurality of ferrous metal strands of relatively high strength and low conductivity, and a surrounding covering of at least two layers of helically wound fiat strips of copper, the strip forming the outer layer of said covering overlapping the strip forming the inner layer so that approximately the longitudinal center line of the outer strip overlies the interstices between the convolutions of the strip forming the under layer whereby said covering is composed of two layers of said strips throughout its length, said strips being in electrical contact with each other and said strip forming the said inner layer of said covering being in contact with said core, and both of said strips J F. HOWE May 27, 1930.

CABLE Filed April 18, 1921

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