UNITED STATES PATENT OFFICE
SAMUEL OAKMAN, OF MELROSE, MASSACHUSETTS.
SPECIFICATION forming part of Letters Patent No. 430,296, dated June 17, 1890.
Application filed November 1, 1889. Serial No, 328,938. (No model.)
To all whom it may concern:
Be it known that I, SAMUEL OAKMAN, of Melrose, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Electric Insulators, of which the following, taken in connection with the accompanying drawings, is a specification.
The object of my invention is to so form an insulator that it, in addition to its usual functions, may be used as a temporary holder for heavy wires, and also as a permanent wire-holder when the said wire turns abruptly from a comparatively level course to one that has an inclined or vertical course, or vice versa. This object I attain by the mechanism shown in the accompanying drawings, in which -
Figure 1 is a perspective view showing a wire attached. Fig. 2 is an elevation, and Fig. 3 is a plan.
This insulator is to be made of glass or some suitable insulating material. The lower part A B of this insulator may be made as shown in the drawings or in any of the well-known and desirable styles adapted for this class of insulators. The interior is to have the usual screw-socket and insulating-space.
That part of the insulator that is above the base A B, Figs. 1 and 2, consists of a dome C, from which cleats D D' extend, said cleats and dome being integral with the base. The cleats D and D', together with the base part B, are so shaped and combined that they form recesses H, H', and H2. (See Figs. 1 and 2.)
The object of my forming the upper part of an insulator in the above-described manner is to provide convenient rests acid holding parts for the wire. Thus the lineman may in putting up the
wire rest it temporarily in the upper recess H', through and over which the wire may be easily drawn until ready to be permanently attached. In case the lineman wishes to temporarily hold the wire, he may belay it around one or both of the cleats D D'.
In Fig. 1 I have shown a wire W W attached. This wire is represented as running horizontally, or nearly so, at W, and after passing partly around the insulator as running in a vertical direction. This is only one illustration of the many ways that a wire may be arranged in connection with my insulator.
That part of the insulator that I have designated as the "dome" is so made in order to give room for the pin-socket and insulating space indicated by dotted lines in Fig.2. This dome shape would disappear if the cleats D D' were made thick enough to admit of a sufficient body of glass to surround the pin-socket. The advantage thus obtained is due to the characteristic external of the insulator, and it is in this characteristic external that the novelty of the device consists.
I claim -
An electric insulator consisting of a single piece of glass and having a screw-pin socket, an insulating-space between the screw-pin and its interior, and one or more dovetail projections, as described, adapted to receive and hold the wires, substantially as and for the purpose set forth.
FRANK G. PARKER,