US452342A - conner - Google Patents

Description

(No Modem l I W. A. CONNBR.

ELECTRIC CABLE.

No. 452,342. Patented May 12, 1891.

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Att y UNITED STATES PATENT OFFICE.

VILLIAM A. OONNER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THE STANDARD UNDERGROUND CABLE COMPANY, OF SAME PLACE.

ELECTRIC CABLE.

SPECIFICATICN forming part of Letters Patent No. 452,342, dated May 12, 1891.

Application tiled July 24,1890. Serial No. 359,717. (No model.)

To @ZZ whom it may concern.-

Be it known that I, VILLIAM A. OONNER, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have inventedor discovered certain new and usefulImprovements in Electric Cables, of which improvements the following is a specification.

In applications of even date herewith I have described and claimed certain improvements in electric cables, the inventions A therein set forth having for their object the production of cables of low static capacity and especially designed for telephone service.

This invention relates to certain f u rtherimprovements in that class or kind of cables,

and is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 is a sectional elevation of a cable, showing the manner of preparing the wires and core, and Fig. 2 is in sectional elevation aportion of a cable constructed in accordance with myinvention.

In the practice' of my invention the conductors or wires l are covered, either by braiding or wrapping to any desired thickness, with cotton, jute, hemp, paper, or other suitable material, preferably of a fibrous nature. This covering 2 is preferably applied in such aloose manner that interstices or openings will be formed therein; but, if desired, the material may be so applied as to form a close compact covering. The covered wires in any desired number are then laid up in any suitable manner and inclosed by a wrapping 3 of cotton tape, paper, or other suitable material. This wrapping is applied in such manner as will prevent, except as hereinafter described, the penetration 0f the sealing material into the covering 2 of the wires. The core thus prepared is passed through the hollow core-bar of a lead-press for the application of the lead sheath at. The core-bar is filled with a suitable sealing` material, as paraftine, resin, oil, rubber compounds, dic., and provision is made whereby a suflicient pressure maybe applied when desired to the sealing material to cause it to penetrate through the wrapping 3 of the core and also the coverings 2 of the wires and fill the interstices in such covering and between the wires. The press is then so adjusted that when set in operation the lead will be pressedvtightly around the core, compressing the wires closely together, and at the same time pressure is applied to the sealing material, so as to causeit to pass through the wrapping 3 and thoroughly impregnato the core. After three or four feet (more or less) of the core have been thus saturated and compressed the press is readjusted, so as to apply the lead sheath loosely around the core, and the sealing material relieved frompressure to a sufcient extent that itwill not be forced through the wrapping 3. It is preferred, however, to maintain a slight pressure on the sealing material at all times, so as to insure its entrance between thelead sheath and the wrapping 3, as shown at G. After about forty or iifty feet (more or less) of the core has passed through the press the latter is again adjusted to force the lead tightly around the core and the pressure increased on the sealing material to cause it to again impregnate the core for a distance of two or three feet, (more or less,) when the press is again changed and the pressure on the sealing material reduced, as before stated. These seals 5, which will prevent the escape of air from the core and the entrance of moisture thereinto, are formed at both ends of the cable-section and also at intermediate points, so that the entire cable will not be destroyed or injured through a rupture at one or two points.

I claim herein as my invention- 1. In an electric cable, the combination of a series of two or more wires covered with fibrous material, a wrapping of closely-laid material inclosing said wires into a core, a coating of sealing material covering said wrapping, the sealing material impregnating and filling the interstices in the core at suitable intervals, and a lead sheath, said sheath tightly compressing the core at points where it is iilled with sealingmaterial,substantially as set forth.

2. As an improvement in the art of manufacturin g electric cables, the method described herein, consisting in covering each wire with iibrous material, inclosing a series of two or more wires so covered in a core by a closelylaid Wrapping, applying sealing material to l In testimony whereof l have hereunto set said w1apping,eausing the sealing material my hand. to pass through the wrapping and fill the core at suitable intervals, covering the eore with a i 5 lead sheath, and compressing' the sheath I Vituesses:

against the core Where the same is lled with the sealing material, substantially as set forth.

VILLIAM A. CONNER.

W. B. CORWIN, DARWIN S. WoLooT'r.

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