US1810079A - Electric conductor - Google Patents

Description

J1me 1931- I H. C..JENNISON 1,810,079

ELECTRIC CONDUCTOR Filed Oct. 1, 1924 INVENTOK A'ITO EY Patented June 1 6, 1931 UNITED STATES PATENT OFFICE HERBERT C. JENNISON, OF BRIDGEPOR-T, CONNECTICUT, ASSIGNOR TO THE AMERICAN BRASS COMPANY, OF WATERBURY, CONNECTICUT, A. CORPORATION OF CON- NECTIC'UT ELECTRIC CONDUCTOR My invention relates to bare or insulated cables for high voltage transmission without substantial corona loss or for other purposes requiring maximum diameter and surface with reduced cross section of conducting material. My invention relates particularly to flexible cables which are of large diameter relative to the cross sectional area of the conducting material. The conducting material of my cable is distributed around the outside surface so that when alternating currents are used at frequencies which tend to concentrate the current towards the outside surface the conducting material is used elliciently. The amount of heat dissipated from my conductor is greater than for a conductor of smaller diameter with equal cross-sectional area of metal. The purpose of my invention is to produce a new and improved flexible cable which is strong, and relatively lightand in which, because of its large size, the corona effect is greatly reduced. A further object of my invention is to produce a cable having a construction such that the cable can be made of larger diameter than cables heretofore used and will have the requisite lightness, flexibility and resistance to crushing effeet.

I attain these objects by providing at frequent intervals, by a newand simple means,

diaphragms and alsoextended surfaces for supporting the cable conductors or strands.

The portions which provide the extended surfaces are cylindrical so as to form curves or arches which resist crushing effect and are integral with the diaphragms so as to insure the diaphragms being held transverse to the axis of the cable.

The following is a description of an embodiment of my invention, reference being had to the accompanying drawings, in which,

Fig. 1 shows partly in side elevation and partly in longitudinal section a cable embodying my invention;

Fig. 2 is a cross-section of the cable on the line 22, Fig. 1;

F ig. 3 shows in side elevation one of the cups forming one element of the interior supporting means;

Fig. 4 shows, partly 1n elevation and partly in longitudinal section, a modification of the construction shown in Fig. 1;

Figs. 5, 6 and 7 show, in longitudinal sections, other modifications, the cabled conduc-- tors being indicated by dotted lines.

Referring more particularly to the draw-.

ings, 2 are a series of cup-shaped bodies having rounded bottoms 4 and slightly closed mouths 6 which bodies are arranged in line with one another so that the rounded end 4 of one body engages the open end 6 of the next adjacent body, thus forming a ball and socket joint between adjacent cups. ;The bodies are slightly elongated and have lon itudinally extending portions 8 so as to e kept from turning when embodied in the cable as hereinafter described.

A series of these bodies 2 is fed to a cabling machine so that the bodies have between them the ball and socket relation above described, and copper or other round conductors 10 in the form of wires or strands are cabled thereon so as to form a covering the shown. The closed end of each of .the' ele-.

ments 2 constitutes a diaphragm transverse to the axis of the cable, which acts to form a rigid support for the cabled conductors. Each element 2 also has a longitudinally extending portion 8 which is cylindrical so as to aline the body inthe cable and present a curved or arched shape acting to resist any crushing effect to which the cable may be subjected. On account of the ball and socket connection between the several elements 2, the supporting means within the cable strands is flexible so that the cable as a whole is flexible and its flexibility is not decreased by the presence of'the supporting means.

In some instances, it is desirable to perforate the diaphragms in the cup-shaped members, as shown in 14 in Fig. 4, and pass therethrough a connecting wire or strand '16 of metal, hemp or other suitable substance, 1::

the advantage being that after the elements have been thus threaded together they can be more easily fed to a cabling machine than which are telescoped one within the other so I as to form a capsule-like device with a diaphragm at each end. In this form the bottoms of they cups are substantially fiat and it is therefore advisable to space them apart a little, and to that end I perforate the diaphragms forming the bottoms of the cups and pass therethrough a metallic wire 22, flattening the wire between each capsule as at 24 so as to hold the capsules in proper spaced relation upon the wire.

In Fig. 6 the inner support is composed of elements of capsule form, the ends of the capsules being provided with projections 26 at the centers of their diaphragm-forming ends which space the capsules apart.

In the form shown in Fig. 7 single flatbottom cups 28 are used which are inserted so as to be spaced apart, so that they do not interfere with bending the cable While furnishing spaced diaphragms and longitudinally supporting surfaces extending therefrom. t

In constructing this cable the interior sup porting means may be of copper orany other suitable metallic or non-metallic material. When made of metal the cups are drawn into the desired shape.

The conductors 10 and 12 which are cabled about the interior supporting means may also be made of any suitable metal, but I prefer hard-drawn copper and if additional tensile strength is necessary make some of the strands of bronze or other'alloy or metal having greater tensile strength.

When either of the connecting strands 16, 22 are employed; the diaphragms are perforated diaphragms, but the transversely ex-.

tending portions of the same will have sufficient strength in connection with the sides of the cup to support the cabled conductors.

so as to prevent crushing of the cable under sever conditions.

In the form shown in Fig. 4 the connecting strand 16 does not interfere with the flexibility of the supporting means, or the ball and socket connection thereof, because the diameter of the mouth forming one part of the socket is sufliciently large so that it does not contact with the connecting strand when the cable is flexed.

The thickness of the walls and diaphragm constituting the cup can be varied according to the resisting force desired in any particular cable. I have found, however, that in the cable such as shown in Fig. 1, having the diameter of one 'and one-eighth inches, 9, thickness of ten thousandths (.010) of an inch for the walls and bottom of the cup is suflicient to produce satisfactory results.

As will be evident to those skilled in the art, my invention permits of various modifications Without departing from the spirit thereof or the scope of the appended claims. What I claim is:

1. In a conducting cable, the combination of a series of cups constituting a supporting means comprising a plurality of diaphragms and round contacting conductors spirally Wound about said supporting means, the several cups having on their sides longitudinally extending surfaces alining the cups within the spirally wound conductors, and adjacent end portions of adjacent cups being suitably nested so as to form-ball and socket joints between them.

2. In a conducting cable, the combination of a series of contacting metallic cups, having slightly closed mouths, constituting supporting means comprising a plurality of diaphragms, the mouth of one cup and the hot tom of the next cup engaging one another so HERBERT o. JENNISON.

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