US735212A - Insulator. - Google Patents

Description

PATENTED AUG. 4, 1903.

V. G. CONVERSE.

INSULATOR.

APPLIOATION FILED Nov.1o, 19o2.

NO MODEL.

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rUNITED STATES Patented August 4, 1903.

Pr-iTENT OFFICE.

INSULATOR.

SPECIFICATION forming part of Letters Patent N o. 735,212, dated August 4, 1903.

Application filed November 10, 1902l Serial No. 130,679. (No model.)

To all whom, it may concern:

Be it known that I, VERNON G. CONVERSE, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered new and useful Improvements in Insulators, of which the following is a specification.

My invention relates to devices for the support and insulation of electrical conductors, particularly conductors used for transmitting currents of high voltage.

I have found that'the best form of a highvoltage insulator consists of at least one outwardly-extending flange or petticoat in order to give sufficient distance from the conductor around the insulator to the support, and I have also found that it is advisable to insulate the insulator-support as far as possible, especially by attaining an eXtra long distance and an extra protection between the line or conductor and the non-insulated or grounded portion of the insulator-support.

In the drawings which form a' part of this specification, Figure I is a view of my insulator, half in vertical section. Fig. II is a like view of a modiiied lform of my invention. Fig. III is a second modilication of the same, and Fig. IV is a section on the line IV IV of Fig. II.

In each of the figures of the drawings 1 represents the top or cap of the insulator, having a series of petticoats or flanges, and is made of some insulating material, preferably glass or porcelain, though other insulating materials may be used. 2 is the section of the insulator which protects the support or pin 3A and is made of insulating material. The top portion of the pin 8 supports the insulator, its bottom portion being fastened to a pole or a cross-arm thereon in the usual manner. The shape or construction of the parts 1 and 2 may be varied provided there is a sufficient' distance around the insulator from the conductor to the pin and the pin is sufficiently covered or protected. An insulator embracing these features of parts 1 and 2 thus far described might be satisfactory if made in one piece; but I have found that it is practically an impossibility in the present state of the art of insulator manufacture to shape or preserve the shape of the insulator throughout the various stages of its construction when it is as large as required for very high voltages.

Referring to Fig. I, the bottom of the section 1 and the top of the vsection 2 are provided with screwthreaded holes 4 and 5, respectively, which receive the threaded ends of the connecting-pin 6. The sections 1 and 2 are separated from each other by the Washer 7, which may be of felt or other material. The washer is to prevent friction between said sections. material or not. In fact, metal may be used if very great strength is required. The pins 3 and 6 do not engage each other, but are separated by the partition 8, which prevents any possible arcing of the current from the conductor 9, which lies in the slot 10 of the section l, to the top of the pin 3 and'between the sections 1 and 2. Where the voltage is not too high, the partitions 8 may be omitted.

Referring to Figs. II and IV, it will be seen thatv section 1 is substantially like the corresponding section in Fig. I. Section 2 has instead of a screw-threaded hole in its top an annular groove 11 to receive the lower end of a cylindrical support or hollow pin l2, which maybe of metal, if desired. The support, pin, or tube 12 has a threaded part 13 cast or made on its upper end to iit the hole et in the section 1. The lower end of the tube or hollow pin 12 is secured in the groove 11 by a filling 14 of sulfur and feldspar or other cement. I prefer to use the washer 7 in this form of my invention.

Referring to Fig. III, the section 1 has instead of the threaded hole 4t the externallythreaded shoulder or flange 15, and the section 2 has its upper end threaded externally at 16. The sections 1 and 2 are connected or secured together by the bushing or sleeve 17, which may be considered a hollow pin and is internally threaded, so as to iit the threads on their adjacent ends. The sleeve 17 may be made of fiber or other material having the necessary strength. p

It will be seen that the top of the pin 3, which is ordinarily not insulated from the ground, is separated from the conductor 9 by a long distance, which is many times greater than if the pin 3 entered thehole 4.-, accord- The pin 6 may be of insulating IOO ing to the usual construction. Vv'here the grounded pin and the conductor are Very close together, an intense electrical stress is set up, and in such a case where currents of very high Voltage are used leakage will occur over the insulator from the conductor to the pin; but where the pin and the insulator are separated by a long distance the leakage is greatly decreased or entirely stopped.

This invention is not limited to the three forms illustrated, as I know of other modiiications which employ the principles thereof. It is applicable to the mounting or the joining of the parts of a built-up insulator such, for example, as is covered by my Patents Nos. 701,847 and 701,848.

Having described my invention, what I claim isl. An insulator comprising a pin, a petticoat-section having an opening for the pin, the opening being closed beyond the pin by the material of the section, a petticoat-section of insulating material beyond the first section and in alinement therewith, and a pin connecting said sections.

2. An insulator comprising` a pin, a section of insulating` material having an opening for the pin, the opening being closed beyond the pin byinsuiating material, a petticoat-section beyond the first section, and in alinement therewith, and a pin connecting said sections.

An insulatorhavin g a pin, an insulatingsection having two openings separated by material oi' the section, one of the openings iitted with the pin, a second pin having one end in the remaining opening in the section, and a second insulating-section having an opening fitted with the remaining end of the second pin.

Signed Pittsburg, Pennsylvania, this 4th day of November, 1902.

VERNON G. CONVERSE.

lfitnesses:

A. STEEN, F. N. BARBER.

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