US219644A - Improvement in telegraph-poles - Google Patents

Description

J. & J. MoDERMOTT.

Telegraph-Pole.

Patented Sept. 16,1879.-

FIG. I].

FIG.

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JOHN MODERMOTT AND JAMES MODERMOTT, OF WASHINGTON, D. (l.

IMPROVEMENT IN TELEGRAPH-POLES.

Specification formingpart of Letters Patent No. 219,644, dated September 16, 1879; application tiled July 29, 1879.

the sockets for holding the insulators.

The object of this invention is to provide a cheap, strong, and durable telegraph-pole and it consists in making said pole of plain tubular wrought or cast iron, having the cross-arm or insulator-supporting bar to pass through said tube.

It further consists in the construction of tapering sockets, either round or square, in

which the insulator pins' or holders are securely seated and held in their places.

It further consists in certain devices where by the tapering sockets are secured to the cross-arm or insulator-supporting bar.

Heretofore in the construction of telegraphpoles of this character they have been made tapering in form, and with rings or projections east thereon, on which the crossbars or insu lator-supporting bars are supported. They have also been made of iron tubes of large and small diameters, the smaller sections fitting intothe larger ones telescopically; but such devices are necessarily expensive in their construction, and impractical on that account.

Referring to the drawings, A designates the iron tube or pole, which may be either cast or wrought, in diameter from two to four inches 5 but for ordinary purposes we prefer to make them of tubes about from two and a half to three inches in diameter, and of any con: venient and desired length.

The tube is sunk or set into the ground about two feet, and the end which enters the ground may be coated with bitumen, both inside and out, by dipping the same into a kettle containing the melted bitumen. This effectually protects the pole where it enters the ground from rust.

In the top of the pole an insulator pin or holder, B, is inserted, and is held in place by the cross-bar or insulatordiolder O, which passes through a hole in the lower end of it, and also through a hole, a, in the tube or pole.

The hole a maybe round or square; but the cross-bar or insulator-holder must be square in cross-section in its central portion, so as to prevent itsturning in the hole a.

The cross-bar or insulator-holderis made square in cross-section at both of its ends, so as to receive and hold the insulator-sockets firmly in a vertical position. The cross-bar 0 may be made from round iron bars squared in erosssection at the points above named; but in practice we may make them of square iron bars, and by so doing will be able to place any number of insulators, of the form hereinafter named, by simply sliding them on one after the other and fastening them with wed ge-keys.

The bar 0 is provided at one end with a head, I), the other end having a screw-thread cut thereon to receive a nut, o.

By this construction the insulator socket and pin (1, or any number of them, are placed on the bar 0, and the bar then passed through a hole in the bottom of the insulator pin or holder B, and through the hole a in the top of the pole. The insulators, of any desired number, are then put on the other end of the crossbar, and the nut c screwed on. h is a key for holding the cross-bar G firmly in position.

D are the sockets for the reception of the insulator-pins, and have formed therein tapering holes, which may be round or square in cross-section, to receive the tapering ends of the insulator-pins,which are of a cross-section to correspond to the cross-section of the sockets.

The sockets D are provided with an arm or projection, f, in which are formed square holes or perforations c, to receive the cross-bar C, and by which they are held in their proper position. The insulator-pins, which are held in the sockets D, and supported by the crossbars 0, are provided with holes 9 near their lower ends, through which are inserted drawbore pins h, which serve to draw the insulators down into the socket D and hold them firmly in place.

E is a short iron bar, which passes through a perforation in the pole, on which a flexible ladder is secured to enable the workmen to ascend the pole, and serves also as a support to the workmen while attaching the wires to the insulators, or for repairing purposes.

Having thus fully described our invention, what we claim, and desire to secure by Letters Patent, is

1. The removable socket herein described, consisting of the two open sockets D and f, carrying the insulator pin or holder as set forth.

2. A telegraph-pole having one or more cross-bars, 0, provided with end and intermediate sockets, D and f, as set forth.

3. A telegraph-pole having a cross-bar, 0, provided with a head, b, and screw and nut c, in combination with one or more removable sockets, D and f, as shown and described.

JOHN MODERMOTT. JAMES lVIoDERMOTT. Witnesses:

D. P. GowL, L. BACON.

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