To all whom it may concern:

Be it known that I, GEORGE B. BROOMHALL, a citizen of the United States, residing at Paterson, Passaic County, State of New Jersey, have invented a new and useful Improvement in Insulators, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

The object of my invention is to provide an insulator of such new construction as to remove the danger of the insulators being broken by the ordinary usage to which insulators are subjected, as well as assaults from stones and shot thrown from the guns of hunters, &c., which will be hereinafter fully explained.

Figure 1 of the drawings shows my invention in elevation anti in position on a pin. Fig. 2 is a plan of the same  Fig. 3 is a section on line B B of Fig. 1.  Fig. 4 is a vertical sectional elevation of the same.  Fig. 5 is a section on line D D of Fig. 1, and Fig. 6 is a modification of that shown in the other figures.

A represents an insulator novelly constructed, and having on its interior surface a screw-thread, h', which thread is adapted to screw on a corresponding screw-thread, G', arranged on a screw-pin, G, as shown in Fig. 4.  The body h of the insulator A, which may be made of glass, porcelain, or any other non-conducting material or materials, substance or substances, is provided near the top and bottom of the same with a circumferential groove, b b’.  The outer surface of the body h of the insulator A is provided with and protected by a metallic cover or case; c, which gives ample protection thereto.  The metallic cover or case c in the circumferential grooves b and b’ is provided with perforations g, through which perforations protrude the glass, porcelain or other non-conducting material or materials, substance or substances that form the body h of the insulator A and form in said grooves b and b’ nodes or projections e, which keep the telegraph or telephone wires from coming in contact with the metal d in the grooves b and b’, as shown in Figs. 3 and 4.  The insulator is provided with a curved top, a, while the pin G has curved projecting parts E and point F.

In practice after the pin G is secured to the pole, post, building, or other position,

the insulator A is screwed on the pins G, which it is adapted to fit, after which the telegraph or telephone wire is arranged in the grooves b and b' on the nodes or projections C, which keep the wires from coming in contact with the metal d of the metallic cover or case c, as seen in Figs. 3 and 4. By reason of the metallic case c the insulators are secured against the danger of being broken not only by the ordinary usage to which insulators are subjected, but from stones thrown by boys and shots from the guns of hunters, while the glass, porcelain or other non-conducting nodes or projections, c, prevent the electric fluid from being diverted from the telegraph or telephone wires.

When used in the modified form shown in Fig. 6, the outer surface of the body h of the insulator is provided with a screw-thread, h’, and the metal case with a corresponding screw-thread, which adapts the metallic case c to screw on the insulator, in which form the telegraph and telephone wires will be in contact with the metallic case h in the grooves b b’; but the quantity of electric fluid thus absorbed by the metallic case will be quite inconsiderable when the device is thus used in the modified form.

Having described my invention and its use, what I claim, and desire to secure by Letters Patent, is--

1. The combination, with the body h, having on its interior surface a screw-thread, h’, to screw on the thread G’, cut on the pin G, of the metallic cover or ease c, having grooves b b’, with perforations g, arranged in said metallic cover or case c in the grooves b b’, with nodes or projections c, to keep the wires from contact with the metal d, substantially as described.

2. The combination, with the insulator A, having a body, h, screw-thread h’, and metallic cover c, with perforations g, and nodes c, of the pin G, having screw-thread G', projecting parts F, and pin F, for securing said pin to the telegraph and telephone pole, and the telegraph or telephone pole, substantially as described.

GEORGE L. BROOMHALL.

Witnesses:

PATRICK HENRY SHIELDS,

JOHN INGLIS.