US1717287A - Insulating rod - Google Patents

Description

June 11, H. w. H. WARREN Er'AL 1,717,287

INSULATING ROD Filed June 21, 1927 Inventors Henry \M H. Warren, Reginald Newbound, by ,M 1%;

- Their Attr'ney.

, 10 the rod.

Patented June II, 1929.

UNITED STATES PATENT OFFICE.

HENRY w. H. WARREN, E covEN'r Y, AND REGINALD NEwRoUNn, or RUGBY, ENG LAND, AssIGNoRs TO GENERAL ELEc'r Io- COMPANY, A CORPORATION OF NEW YORK.

INSULATING ROD.

Application filed June 21, 1927, Serial No. 200,457, and in Great Britain August 5, 1926.

Our invention relates to insulating rods and particularly to insulating rods which are used to support or operate electrical apparatus. Y

Insulating rods have been made in the past with reinforcing layers of fabric moulded therein and extending throughout the length of the rod, the reinforcement being provided for the additional strength which it gave to While such a rod is thereby strengthened at the points at which connec. tions are made thereto, for example at the ends of the rod, it is found that its insulating properties are impaired by the reinforcement and there is a tendency for the rods to split longitudinally between two adjacent layers when the rod is subjected to large potential differences. An object of our invention therefore is to provide an insulatingrod for use such as described which shall avoid the aforesaid objections and have both the,

mechanical and the electrical strength desired. Our invention will be better understood from the following description taken in connection with the accompanying drawing, and its scope will be pointed outin the appended claims.

Referring to the drawing, Fig. 1 is a longitudinal cross section of one embodiment of our invention and Fig. 2 is a similar view of a modified form. I In the drawing-we have shown an insulating rod 1 which for example may comprise a portion of an oil switch such as the switch operating rod. For illustrative purposes we .have shown the rod l in Fig. l as the operating rod of an oil switch, the rod being pro-- vided with a socket member 2 at one end secured to the rod by the rivets 3 and adapted to "carry a cross head or other contact supporting member and provided at the other end with a clevis 4 by means of which it is pivoted at 5 to the member 6 which may be a lever of a switch operating mechanism. The rod 1 is constructed of an insulating synthetic moulded compound, the central or body portion being uniform in composition while the end portions have embedded therein a reinforcement in the form of parallel insulating layers 7 as for example of fabric. The layers 7 thus serve to reinforce mechanically the end portions of the rod-Where such reinforcement is desirable without lowering the insulation value of the intermediate portion of the rod or rendering it liable to longitudinal split-' ting. lVe prefer to make the layers of varying lengths thereby to more securely embed them in the insulating compound.

In the modified form illustrated by Fig. 2 the rod 8 is adapted to have a connection made thereto at an intermediate point as well as the ends. It is here shown as 'a cross head of an oil switch having contacts 9 and 10 mounted on the ends thereof and supported in the middle by the operating rod 11, the

contacts being electrically connected togther 1 by the conducting strap 12. In addition to the reinforcing layers 7 at the ends of the rod '8 that part of the intermediate portion which is secured to the rod 11 also is provided with reinforcing layers 13 which are simivarious lengths.

What we claim as new and desire to secure by Letters Patent of the United States, is,- 1. In an electric switch, a rod of insulating material having portions adapted to receive mechanical connection, said portions of the lar to the lavers 7. They also preferably have rod being provided with a plurality of spaced layers of reinforcing fabric, the extent of said layers being limited substantially to said portions.

2. In an electric switch an insulating rod adapted to, have mechanical connections made to the ends thereof, said rod being constructed of synthetic insulating material having layers of reinforcing fabric arranged in and limited HENRY w. R. WARREN. REGINALD NEW ouNn.

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