US2119394A - Electric cable - Google Patents

Description

- May 31, 1938. E. H. LEWIS Er L 2,119,394

ELECTRIC 0mm:

-' Filed Dec. 18," 1934 BRA|D RUBBER COTTON CONDUCTOR Inventors: Edward H.Lewis.

Cliffovgl O. Hull, )0 fig/wf PH Their Attorne y.

Patented May 31, 1938 PATENT OFFICE ELECTRIC CABLE Edward H. Lewis, Union, N. .L, and cumin 0. Hull, Stratford, (lonn assignors to General Electric Company, a corporation of New York Application December 18, 1934. Serial N .,758,012

2 Claims.

Our invention relates to an electric cable and more particularly to a cable with an overall fibrous braid which will not fray back from the end of the cable.

An object ofour invention is to provide an improved electric cable in which the outer covering of braid will not become loose and fray back from the end while the cable is in use.

What we consider to be novel and our invention will be better understood by reference to the following specification and appended claims when considered in connection with the accompanying drawing in which the single figure is a side elevation of our improved cable showing the layers of insulation. In cable provided with an overall rubber jacket covered with a fibrous braid difiiculty has been experienced due to the fact that the rubber jacket has a smooth exterior surface over which the braided covering is formed. The braided covering at its free end moves freely over the surface of the rubber and is loosened in use and in the course of time the braided covering begins to fray back from the end. To prevent the loosening of thebraided covering when it is applied'over a rubber jacket, we have provided a plurality of closely arranged ribs on the surface on the rubber jacket which presents 'a'high friction surface to the braid and thus prevents the loosening and fraying back of the braid.

In the drawing, l and I I indicate two stranded conductors. Over the conductors Wand ll cotton coverings I 2 and [3 are provided which are formedby cotton strands laid longitudinally around the conductors. It may be found desirable to form the cotton coverings I2 and i3 by a braid or winding. Over the cotton coverings l2 and I3 layers of rubber insulation l4 and I5 are provided. Over'the combined conductors and insulation on overall rubber jacket I6 is provided rubber Jacket IS a fibrous braid I1 is formed. Due to the ribbed surface on the jacket Hi the braidil tightly engages the jacket I6 and does not become loosened with use and so will not fray back from its free end. It may also be 5 found desirable where a single conductor with a rubber jacket is covered with a braid to form the surface of the Jacket with ribs to prevent loosening of the braid from the single conductor and its insulation. It is believed that longitudi- 1 nal ribs will more efliciently prevent the loosening of the braid but it may be found satisfactory in some cases to use ribbed surfaces which extend spirally over the jacket or in any other irregular form.

From the foregoing it may be seen that an improved cable is provided with a rubber jacket covered by a braid which will not become loosened with the useof the cable.

What we claim as new and desire to secure by Letters Patent of the United States is:

1. An electric cable comprising a conductor, a rubber covering over the conductor having a plurality of small continuous ribs extending throughout its length and which are closely ar- 5 ranged, and a fibrous covering braided tightly over the rubber covering whereby the ribs prevent the ready loosening and fraying back of the braid. v

2. An electric cable comprising a plurality of 0 conductors, an, insulating covering over each conductor, a' rubber jacket over the combined conductors having a plurality of small continuous longitudinal ribs extending throughout its length and which are closely arranged, and a fibrous covering braided tightly over. the rubber jacket whereby the ribs prevent the ready loosening and fraying back of the braid.

EDWARD H. LEWIS. 40 CUFFORD o. HULL.

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