US65886A - Improvement in insulators foe telegraph wires - Google Patents

Description

A. B. DAY. INSULATOR FOR TELEGRAPH WIRES.

No. 65,886. Patented June 18, 1867.

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-ALFRED LB. DAY, OF GREEK, WISCONSIN.

Letters Patent No. 65,886, elated June 18, 1867.

IMPROVEMENT IN INSULATORS FOR TELEGRAPH WIRES.

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TO ALL WHOM 1: Mar CONCERN:

Be itkno'wn that I, ALFRED ILDAY, of Oak Creek, in the .couut'y,.o.f.lllilwaukee, and State of Wisconsin, have. invented a ncw'and improved Insulator for Telegraph Wires; and I do hereby declare that the following is a. full, clear, and exact description thereof, which will enable those. skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in whieh- Figure 1 represent a vertical sectional view-of my improved shank insulator, the line a: re, fig. 3, indicating the plane of section.

Figure 2 is a similar view of an insulator that is to be attached to a cross-arm.

Figure 31s a horizontal sectional view of the insulator, the plane of section being indicated by the line 1/ 1. s-

Similar letters of reference indicate corresponding parts. I The object of this invention is-to provide an insulator for telegraph wires with a dead-air chamber by combining a wooden plug, a number of glass lugs, and a. wooden disk-in such a manner with a cast-iron shell that only a very small orifice is left around the pin-hook for the atmosphere to enter, and any moisture entering by that orifice will, by reason of the lower temperature of the iron shell, condense and settle thereon, leaving the wooden plug and the glass lugs very nearly in a. dry and non-conducting state.

A represents in cast-iron cylindrical shell, open at the top, and with but a small orifice, a, at the bottom.

On the inside of the shell are provided grooves or guides I) b, in which four, more or less, glass lugs, B, are placed, and prevented from moving sideways, their lower ends resting on a flange, e. in the shell A. These glass lugs are made almost triangular, as shown in fig. 3, the outer corner being rounded, as shown. At their lower ends they are wider than at. the top. A conical wooden plug, 0, provided with four, more or less, grooves onits outside, is placed froin abov e into the shell, and the edges of the lugs B fit into the grooves in C, and the tapering form of the said lugs prevents the plug from being lowered beyond a certain mark. A pinhook, I D, of usual construction, and, with a screw-shank, d, is placed from below through the orifice a into the side' ofthe cylinder A-. Before the lugs B or plug C are inserted into the shell, a. wooden circular: disk, E, is placed from above over the shank of the pin-hook I). When the plug C is placed between the lugs, the pin-hook D is screwed into the plug until the disk E is held-between a flange, a, MD and the plug, so that its lower surface is held a little above the bottom of the shell. -A glass lug, F', is then placed on top of the plug C, and the shell A is then closed with a cover, so that the said cover will come in contact with the glass knob F. Where the shell A is provided with an iron sercw shank, ll, to be fastened directly to a pole, or to the side of a bullding, the cover is screwed on the shell, or it is provided with grooves, whereby it is held on pins ff, projecting from the sides of the shell A, as shown-in fig. 1. But when the outside of the shell isprovidcd with a screw-thread, so that the same can be screwed into'a cross-head, I, as shown in fig. 2, then the cover G can be made of sheet iron, and will beheld in'place' by forcing it against the top of the cavity into which the whole instrument is placed.

By the aforesaid arrangement I obtain a very great surface for the dead-chamber, which will be almost an area of one hundred square inches in a full-size insulator. The dead-air chamber is entirely excluded from the atmosphere,.ex eept at the small orifice around the pin-hook. It is evident that any moisture entering by that orifice will, by reason of the lower temperature of the iron shell, condense and settle first on the said shell, leaving the wooden plug and glass lugs very nearlyin a dry and non-conducting stat But even assuming that all the moisture entering the chamber should condense evenly upon the whole surface of the chamber, it is improbable that, even in the longest storm, a sufficient quantity of moisture can accumulate to form the least escape.

When put together, this insulator should be dipped in asphalte or coal tar for the purpose of closing all crevices around the cover, and also for protecting the shell itself.

I claim as new, and desire to secure by Letters Patenty 1. The lugs 13 and 1*, made of glass or other suitable non-conducting material, in combination with the wooden plug C on the inside of the cast-iron cylinder A, all made and operating substantially as herein shown and described. l

2. So constructing the shell A that the cap G can be held down by the cross-head I when the insuletor is attached to the same, all as herein shown and described.

ALFRED B. DAY. W-itu essas Jams Moons, SAMUEL W. DAY.

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