US1426421A - Condenser cemented sectional insulator - Google Patents

Description

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PATENT OFFICE.

SOL. S. SONNEBORN, OF BROOKLYN, NEW YORK, ASSIGNOR TO HOIPEWELL INSULATION -6v MFG. CO., INCORPORATED,v CORPORATION OF VIRGINIA.

CONDENSER CEMEN'IED SECTIONAL INSULATOR.

Specification of Letters Patent. Patented Aug, 1922,

Application filed February 27, 1917". Serial No. 151,364.

To all whom t may concern.'

Be it known that I, SOL. S. SONNEBORN, a

of Brooklyn, county of Kings, and State of New York, have invented certain new, and useful Improvements in Condenser Cemented Sectional Insulators, set forth in the following specification.

This invention relates to sectional highpotential insulators of the typeadapted to be mounted on a pin.

The object-of the invention is to increase the puncture strength of a plurality of nested insulating sections by distributing as uniformly as possible the electro-static stress over the surfaces of the nesting portions. A furthermore specific object is to `accomplish thisl distribution of electro-static stress by employing a filling or cementing compound of such a character as to serve two purposes, that of mechanically uniting the nesting parts and that of providing an electrically conducting partition between the insulating partitions. Heretofore, on page 923 of Part I, volume 32 Iof the Transactions of the American Institute of Electrical Engineers, a condenser type insulator has been described as built up of a series of substantially bell-shaped metallic shells, spaced apart but'nesting and the spaces therebetween lilled with a moulded dielectric compound. This theoretical suggestion is impracticable in the'construction of a commercial insulator and it is s ecifically an object of my invention to attain substantially the same beneficial nesult in the way of stress distributionby employing standard vitrified porcelain sections but instead of cementing them together with an insulating cement, mechanically to unite them one to the other by a metallic filling -and either to extend the metallic filling as a conducting canopy over l cation in connection with the figures of the accompanying drawing, which forms a part hereof and in which like characters desigexact number is immaterial.

nate corresponding parts in the figures, and

in which Fig. 1 is a vertical elevation partly citizen of the United States, and a resident in vertical section of one illustrative embodiment of my invention; and. Fig. 2 is a fractional view in vertical section illustrating one of the many possible modifications of my invention. v

The insulator A is shown built up from a plurality of insulating sections l, 2 and 3. So far as my invention is concerned, the

I have illustrated standard sections of a commercial type of pin insulator. The first or bottom section 3 comprises a cup-shaped portion 4, suitably formed such as with threads to take the pin 5 and having-exterior corrugations 6. This insulating section 3 also comprises a flaring petticoat 7. A second or. next outer section 2 comprises a cup-shaped portion 8, adapted to nest over the cup-shaped portion A and having internal and external corrugations 9 and 10. The section 2 alsoy comprises a flaring petticoat 11. The outer section l comprises a cup-shaped portion 12 and a flaring petticoat 13, the cup-shaped portion having internal corrugations 14 and a seat 15 for supporting a conductor. It is to be understood that the corrugations formed on the adjacent 'surfaces of the cupshaped sections need not, of necessity, be corrugations, as any provision tending to lock the lparts together through the medium of filling is contemplated.

The filling, which has heretofore lbeen a highly insulating' cement, in the case of my invention, as illustrated by the fillings 16 and 17, is metallic. It may be formed in any suitable manner such as by pouring molten lead ora conducting alloy into the spaces between two nested portions, the same S25 being inverted during the process; or the filling may be formed from a suitable metallic amalgam such as a zinc mercury amalgam or the filling may be formed out of av plastic metallic cement, the principal base of which is a ulverized or granulated metal.

' Be ore the assembling ofthe various secy tions going to make up the insulator, sheet metal sheaths such as 18 and 19, preferably formed lto conform to the surfaces of the petticoats for which they `are designed, may be applied lto the petticoats, as for example, lto the petticoats 7 and 11 respectively. When the metallic fillings 16 and 17 are. formed the filling may have a portion such as the portion 20 for the filling 16 and the portion 21 for ,the filling 17, which is caused electrically and mechanically to unite with the respective metallic sheaths 18 and 19. If desired, the portionsQO and 21 may be solder. In otherwords,"the sheaths 18 and 19 may -be soldered directly to the metallic filling, in which case a chemical union in addition to an electrical and mechanical one is made. It is also comprehended that, if the sheets are made of zinc, it is possible to make achemical union between the cement and the vzinc amalgam filling.

In Fig. 2 I have shown a modification in which the filling 170 is itselfl continued and flared into the sheath 190 about the surface of the petticoat 7.

What I claim and what I desire to secure by United States Letters Patent is:

1. A high-potential insulator of the condenser type comprising a plurality of insulating sections, each section comprising a cup-shaped portion, the cup-shaped portions being nested one within the other; one or more of the inner sections having a petticoat; a metallic filling covering the entire surface of a nested cup-shaped portion of a sectionand mechanically uniting it with the next outer cup-shaped portion; and a metallic sheath covering the petticoat portion'of saidv section and in electrical connection with said metallic filling.

2. A high-potential insulator of the condenser type comprising a plurality of insulating portions in the forni of solids of revolution having each a cap-part and at least one a petticoat-part also, the cap-parts

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