US320921A - Compound for insulating electric wires - Google Patents

Description

UNITED STATES PATENT OEEIOE ROBERT S. FERGUSON, OF \VAUKEGAN, AND WVILLIAM SOHUMAOHER AND \VILLIAM TUBMAN, OF CHICAGO, ILLINOIS.

COMPOUND FOR lNSULATiNG ELEOTRlC WlRES.

SPECIFICATION forming part of Letters Patent No. 320,921, dated June 30,1885.

App ication filed February 27, 1955.

To all whom it may concern.-

Be it known that we, ROBERT S. FERGUSON, of XVaukegaIni n the county of Lake and State of 11linois,and \VILLIAM SOHUMAOHER and WIL- 5 LIAM TUBMAN, both of Chicago, county of Cook, and State of Illinois, and all citizens of the United States, have invented a certain new and useful Compound for Insulating Electric WVires, of which the following is specifica- IO tion.

The object of this invention is to produce a compound containing pine pitch, which shall normally be maintained flexible when cold to a degree effectually preventing said compound I 5 from cracking, which compound shall also nor- Inally contain sutlicient moisture to absorb and carry off induction between two or more wires laid in it, but separated from each other.

Our compound consists of pine-pitch, three 20 hundred (300) pounds; hard or soft rubber,

one and one-half (1%) pound; and liquid asbestns, one (1) gallon, to which is added beeswax, or tallow, or linseed-oil until of the proper consistence to render the compound (when cool) 2 quite hard and yet flexible. To combine these ingredients, they are placed in a suitable vessel, and heated in any desired manner under agitation sufficient to thoroughly mix them.

The essential materials of our compound are 0 pine-pitch and beeswax, or tallow, or linseedoil, or any similar substances, and in such proportions as will render the pine-pitch (when cool) flexible to a degree suftieient for preventing the pitch from cracking when subject to 5 strainssuch, for example, as the bending of (N0 specimens) a coated wire, or as occur atthe joints of seetional underground conduits and which will carry Off but not promote induction.

In practice any grease, fats, or oils are perhaps preferable to beeswax; but the latter may be used to a very good advantage.

Electric wires simply coated and not embedded in this compound, as they will be when used in underground systems, may, as has been practically demonstrated, be laid in water or on the ground, or both, and yet successfully operate, although only covered by a very thin coat, applied by passing the wire through the compound while in aheated or liquid condition.

\Vhat we claim, and desire to secure by Let ters Patent, is

1. The hereiu-described compound for insulating electric wires, the same consisting of a base composed of pine-pitch. and beeswax, or tallow, or linsecdoil, or other materials holding moisture in suspension and rendering the pitch flexible when cool.

2. The herein-described compound for insu- 6:) lating electric wires, the same consisting of pine-pitch, rubber, and asbestus, mixed with beeswax, ortallow, or linseed oil in the manner and proportions specified.

ROBERT S. FERGUSON. XVILL'IAM SGHUMAGHER. XVM. TUBMAN. Witnesses:

XV. W. ELLIOTT, JNO. G. ELLIOTT.

also contain or absorb moisture sufficient to 1