US313377A - Wiees to insulatoes - Google Patents

Description

2 Sheets-Sheet 1.

W. H. SAWYER.

CLAMP FOR BINDING WIRES TO INSULATORS.

(No ModeL) Patented Mar. 3, 1885 TOR Y QAN BQX xxx-mm $13 Attorney (No Model.) I 2 Sheets-Sheet 2,

'W. H SAWYER.

CLAMP FOR BINDING WIRES TO INSULATORS.

Nb. 313,377. Patented Mar. 3, 1333.

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UNITED STATES PATENT OFFICE.

WILLIAM H. SAIVYER, OF PROVIDENCE, RHODE ISLAND.

CLAMP FOR BINDING WIRES TO INSULATORS.

SPECIFICATION forming part of Letters Patent No. 313,377, dated March 3, 1885.

Application filed September 17, 1884. (N0 mode To all whom it may concern.-

Be it known that I, WILLIAM H. SawYnR, a citizen of the United States, residing at Providence, in the county of Providence and State of Ithode Island, have invented certain new and useful Improvements in Clamps for Binding \Vires to Insulators, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to an improved device intended to be used especially for binding covered electrical conducting-wires to insulators. It has been found that when wires covered with cotton or other fibrous material, rubber, gutta-percha, kerite, and even lead, are bound to insulators with the ordinary tiewires, such wires speedily cut through the covering, thus allowing moisture to have access to the wire with the result of corrosion, which will impair the conductivity of such fine wires as are ordinarily strung covered, and will so weaken them as to cause them to break in a short time. The disadvantage of the tie-wires in cutting the covering is especially felt in the case of multiple covered conductors or cables and metallic circuit-conductors in. which two wires for a complete metallic circuit are inclosed in a common covering, though insulated from each other therein. In a cable the tie-wire after cutting through the coverings will come in contact with numbers of the conducting-wires and form crosses, and in a metallic circuit-conduetor the tie-wire will cut through to and come in contact with both conductors and short-circuit them.

The object of my invention is to provide a clamp which will securely hold covered electrical conductors to supporting insulators without injuring the coverings of said wires.

In the accompany drawings, Figure l is a perspective view of my improved clamp for binding a covered wire to an insulator. Fig. 2 is a similar view of the same applied to an insulator for binding a wire thereto. Fig. 3 is a sectional view in a plane just above the clamp, and illustrating the manner in which said clamp is sprung upon the insulator. Fig. 4 is a perspective view of a modified form of the clamp as in use. Fi 5 is a diagram illustrating the manner of applying the clamp.

The letter A indicates the clamp, which is simply an arch-shaped bar of iron, having at its ends, on one side thereof, circular disks (0 with circumferentially-grooved peripheries, forming wire seats. These disks project toward each other in the direction of a line uniting the ends of the arch, and are at a distance from each other slightly less than the diameter of that portion of an insulator which the clamp is intended to partially embrace, so that when the insulator is forced in between these disks or heads (the arch being deep enough to receive a little more than half of the circumference of the insulator) the disks will be forced slightly farther apart than their normal distance, and will again spring toward each other when the diameter of the insulator has passed between them. It will be understood, of course, that the insulator and clamp must be properly proportioned to each other.

Bis the insulator, and immediately below its head 7) is a groove to receive the arched portion of the clamp on one side and the wire or covered conductor on the other side.

In applying the clamp to hold a covered conductor, the said conductor, as at O, is formed into a loop and inserted between the two disks in a direction from the arch, as shown in Fig. 5. The insulator is then placed in this loop and the conductor drawn outward in both directions through the grooves in the disks a a, thus decreasing the size of the loop and drawing the clamp upon the in sulator, beyond the diameter of which it will spring and clamp it firmly, so that on opposite sides of the insulator the conductor will be embraced by the groove in said insulator and the grooves in the disks, said grooves being of proper size with relation to the insulator to receive it snugly, so that the bight 0f the conductor, which partially surrounds the insulator, will not be liable to slip.

In order to further guard against slipping of the conductor, the bottoms of the grooves in the disks may be cross-grooved or corrugated, as may also be the bottom of the groove in the insulator.

It will be observed that the grooved peripheries of the disks to a form extended wire seats which will not cut any insulating or protecting covering with which the conductor or conductors may be provided.

\Vhile this clamp is especially intended for ICO use with covered wires, it may also be used with naked wires, and in such case I prefer to rmali the disks at the ends of the arched bar thicker and with broader grooves, and I give the wire a complete turn around each disk to prevent its slipping, as shown in Fig.

I do not confine myself to any particular form of arched bar.

I claim 1. The arched elastic clamp having its tips provided with wire seats, and separated by a slightly less distance than are the portions of its opposite limbs immediately adjacent to said tips, whereby said clamp may be sprung upon a suitable insulator, and will maintain its hold upon the same, essentially as set forth.

2. The eombinatiomwith' the insulator and

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