US666545A - Lightning-arrester. - Google Patents

Description

Patented lag-n.22, |90I.

w. u.' nomma. LIGHTNING ARRESTEB.

(Applioltivn Mod. lll. 28, 1900.)

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UNITED STATES PATENT y Garten.

WILLIAM N. MCANGE, OF SUFFOLK, VIRGINIA.

LIGHTNING-ARRESTER.

SPECIFIGATIONVforming part of Letters Patent No. 666,545, dated January 22, 1901.

Application led March 23, 1900. Serial No. 9,955, (N IDOCleL) To rtl?, whom, it may concernf Beit known that I, WILLIAM N. MCANGE, acitizen of the United States, residing at Suffolk, in the county of Nansemond and State of Virginia, have invented a new and useful Lightning-Arrester, of which the following is a specification.

This invention relates to li ghtning-arresters in general, and more particularly to that class employed for protecting electrical circuits and connected machines or instruments from the effects of atmospheric electricity, one object of the invention being to provide a construction in which the excessive charge will be effectively grounded prior to reaching the instru ment or other apparatus protected.

A further object of the invention is to pro- Vide a construction which will be simple and cheap of manufacture and in which the leaping of the charge around the arrester will be prevented.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in both views, Figure lis a perspective view showing the complete arrester. Fig. 2 is a plan View with the casing of one of the choking-coils shown in section to illustrate the formation of the coil.

Referring now to the drawings, the prescnt lightning-arrester comprises two parallel choking-coils 5 and 6, of suitable conductingwire, these coils being' similar in every respect and each being wound in a helical groove in the periphery of a cylindrical core 7 and 8, respectively, of vulcanite, wood, or other suitable insulating material, the extremities of each coil being passed inwardly of the core through a radial perforation therein and then outwardly through an axial perforation, as shown at 9 and l0, so that the coils are effectively prevented from untwisting and consequent displacement from their respective cores. The outer surfaces of the coils are sunken slightly below the surfaces of the cores, so as not to contact with tubular metallic casings l] and l2, which are slipped over the coils and their cores and lie with their inner faces in direct contact with the outer faces of the cores and with sufficient friction to prevent dislodgment of the casings. The casings are thus insulated at points from the coils and are isolated from the coils at other points by air-spaces, so that currents of normal potential in the coils cannot pass to the casings.

The coils, with their cores and casings, are mounted upon an insulating-base l2, of marble, porcelain, or other suitable material, and are held in place thereon by means of clamping-plates 13 and l5, the ends of each of which are arc-shaped to engage the outer faces of the casings, and the plates are of equal length, so that the coils are held parallel mutually. The plate 13 is shown as held to the base l2 by a screw 14, while the plate l5 is held to the base by the stem of a binding-post 16, this postl forming a means for connection of a ground-Wire 17 with the plate l5 and thence with the casings of the choking-coils.

At the outer side of each of the chokingcoils is located a fuse-wire 18, which in each instance is mounted upon the usual mica plate/or sheet 19, the terminals of the wires being` formed by metallic plates 20, carried by the mica sheet, and these metallic plates 2O are directly engaged by bindingscrews 2l, which are passed through the usual slots in the plates and into posts 22, mounted upon the base l2. The posts 22 are in the form of iingers, as shown in Fig. l, which project upwardly from plates 23, which are in turn attached directly to the base l2nb by means of attaching-screws. The attaching-screws 24 at one end of each of the fuse-wires are electrically connected with the farther end of the adjacent choking-coil, as illustrated in dot-- ted lines in Fig. 2 of the drawings, While the attaching-screws 25 at the opposite ends of the fuse-wires have conductors 26 and 27 connected therewith which lead to the instruments or machines to be protected. The ends of the choking-coils adjacent to the attaching-screws 24 are electrically connected with binding-posts 2S and 29, which are in turn connected with the line-wires 30 and 3l, as shown. With this construction it will be seen that both line-wires areconnected with the terminals of their respective choking-coils and that the current from one line-wire after passing through the corresponding chokingcoil passes through the fuse-wire in connection therewith, thence to the instru ments or 4 machines to be protected, then through the second fuse, theuthrough the second coil, and

thence to the second line-wire. Therefore should either line become overcharged at any time the outer periphery of each choking-coil Wili present a succession of discharge-points which, in cooperation with the encircling metallic casing, will act to discharge the excess current to the ground-wire. Furthermore, such current as is not thus discharged will in passing through the fuse-wire burn it out if that current be sufficient to harm the instruments or machines, and such instruments are thus doubly protected.

It will of course be understood that in practice the specific construction and arrange ment herein shown may be altered and various modilications maybe made; furthermore, that any suitable materials and proportions may be used for the various parts without departing from the spirit of the invention.

What is claimed isl. A lightning-arrester comprising an insulating-core having a helical groove, a choking-coil wound in the groove of the core and having connection with the line and the instrument to be protected, said coil lying below the surface of the core, and a tubular, metallic protecting-casing [itted to the core and inclosing` the coil, said casing being separated from the coil by an interspace and having a ground connection.

A lightning-arrester comprising a base, a core having a helical groove, a choking-coil wound in the groove and lying below the surface of the core, a conductive protecting cylindrical casing for the coil engaging the core and separated from the coil by a continuous interspace, a ground connection with the casing, a fuse-wire in series with the coil, and means for attachment of line and instrument wires with the coil and fuse, respectively.

3. A lightning-arrester comprising a base, chokingcoils adapted for connection with separate line and instrument wires,a conductive, inclosing casing for each coil and separated therefrom by an interspace, conductive clamping-plates engaged with the casings and with the base, and a ground connection with one of the clamping-plates.

4. A lightning-arrester comprising a base, choking-coils adapted for connection with line and instrument wires, a fuse between each coil and the connected instru ment, a p rotecting conductive casing inclosing each coil and separated therefrom by an interspace, conductive clamping-plates engaged with the casings and held upon I(he base, and a ground connection with one of the clamping-plates.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

WILLIAM N. MCANGE.

Vitnesses:

JAS. L. MCLEMORE, J. C. BRADY.

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