US1110934A - Insulator. - Google Patents

Description

E. M. HEWLETT.

, INSULATOR.

I v AYILIATION FILED APBHZO, l907. 1,1 10,934, 1 Patented Sept. -1-5, 1914,.

2 SHEETS-Smm 1.

Wwwiag l inn/ENTER l EDWARD M HEWLETT..

E. M. HEWLETT.

INSULATOR. y APPLICATION FILED APR. 20, 190.7. 1,1 10,934, Patented Sept. 1 5, 1914.A

2 SHEETS-SHEET 2.

Witnesses inventor ya Edwavd Tl. Hewlett,

UNITEDy sTATEs PATENT oEEIc-E.

EDWARD M. HEWLE'r'r,.or seHENEcTaDY. NEW YORK, AsSIGNoE To GENERAL ELECTRIC COMPANY. A Aceleron/friert10F NEW YORK. I

INSULATOE.

Specification of Letters Patent.

Patented Sept. 1,5, .1914;

Application filed April 2o, 1907.` semi No. 369,245.

To all whom t may concern Be it known that I, EDWARD M. HEWLETT, a -citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Insulators, of which the following is a specification.

' The present invention relates to insulators for electric conductors andvmore especially i connected thereto. The matter of preventing puncture in an insulator ordinarily depends upon the thickness and character of Vthe material of which it is made, but the matter of preventing creepage of current over its surface is'one of much diiiicultyges-l peoially" in insulators for out door use, for the reason that during rain storms a sufficient film of water.' may collect on the surface of the insulator'to provideI a more or less perfect conductorbetwpeen the parts intended to be insulated thereby. If the insulator is clean,` and -of sufficient size,` this is usually7 not. serious, but it is otherwise when the insulator is covered with soot or other matter collected fromU the air, particularly salt, which usually collects `on insulators which n are used near the sea-coast.V Such deposits not only serve to hold a greater quantity of water on the insulator, but often greatly4 increasethe conductivity of whatever water `may be there, since impure water is generally much more conductive than pure rainwater.-

The object of my invention is-to provide an insulatorwhich may be subjected to great strain without injury and in which the difii# culties'heretofore experienced in other types of insulators'from the creepage of the current over the surface are overcome or minimized. l

In carrying out my mvention I make the insulator with an imperforate central portion having provisions .on opposite -sides thereof for attachment of the conductor` parts to be insulated, and a c'lisk-shaqied eX- tension from the central'portion with'provisions thereon for diverting the drops of rain so that they will not form a film of water on both sides of thevinsulatorl at one and the same time, while both sides are left-exposed so as to be washed by the-rain at different times, according to the directionin which it `is driven against the insulator, whereby the soot and o her particles which have gathered on the surface are removed therefrom.

Referring to the drawing .forming a partof this specification, Figures'l and '.2 are axial sections; Fig. 3 is a side elevation of an insulator embodying one form of my in-A vention; Figs. 4., 5` and 6 are similar views showing a modified form ofthe same, and Fig. 7 shows, in perspective a system of line suspension in which my insulatorsare used.

The form of insulator shown in'Figs. l,

2 and 3 has a central section 1 with-"circulan holes 2, 3 from Aopposite sides arranged in4 planes at right angles to each other an` in'- terlinked as shown in Fi s. 1 and-2, wi h a substantial wall 4 of insu atin material between them. The holes 2 an -3 are made" sufiiciently large to permit the tie wiresj to be easily threaded therethrough toor'm loops or bites. Surrounding the vcentral slection 1 is a disk section 6 having an outwardly flaring fiange 7 extending from one side thereof and forming therewith a peripheral groove or trough\8 by which the' rain water striking on the upper edge of the insulator is conducted around to the lower edge without coming in contact with the side of the central section 1 opposite to that against which the rainimay be drivenfor the time being. l

In the form of insulator shown in Figs. 4,

5 and 6, the central section 1 is substan' i tially like the preceding. The disk section 6 has at its periphery two oppositely flaring flanges 7 which form a peripheral groove or trouUh 8, and extendin0-outwardly from the disk section about half way between the cenarea ofl the f r'eep'age surface of the insulator.

transmit the strain The insulators are designed to be positioned in vertical planes, as show-'n in Fig. 7, which represents three high potential condugtors 10 supported at the top of an iron tower 11. A plurality of insulators are connected together in seriesl and to attaching devices by tie wires 5 with their ends held 4by clamps 12. The'inner attaching device off each series of insulators is in the form of iahook 13 engaging an eye 14 carried by the cross har of the tower, and the outer attaching device is in the formof a clamp adapted to grip the conductor wire 10 and thereon through the insulators to the tower while the portion of the conductor between a pair of clamps 16 is allowed to hang loosely in a jumper loop .17 below the insulators and cross bar 1o whereby thecontinuity of the line is uninterrupted although securely anchored against longitudinal movement to the tower so that if one span of the conductor should break, the unbroken spans will not become displaced. x

When rain falls upon an insulator constructed as above described, the Windward side will be thoroughlywashed, while the lee side thereof will remain dry and creepage of electricity thereover accordingly will not take place; and when the; rain is driven from a contrary direction against the insula` tor, the first side will remain dry while thc second is effectually washed.

l I do not desire to restrict myself to the particular forms or arrangement of parts herein shown and described, since itis apparent that they may be changed and modified without departing from my invention.

What I claim as new and desire to secure bygLetters Patent of the United States, is,

1. An'insulator having means for connecting conductors to opposite sides thereof and means for diverting rain from either side thereof while the other side is exposed to the washingaction of the rain.

2.An insulator having a central portion provided with means on opposite sides for connecting thereto metallic parts subject to difference of electrical potential,I and a rain deector surrounding said central portion and adapted to maintain a dry region in all paths of possible leakage from one metallic part to the other. ,4

3. An insulator having a central portion provided on opposite sides with means, for connecting "thereto .metallic .p arts subj ect, to difference ofelectrical potential, a diskportion surrounding. said central portion, anda flange projecting from onesideof said disk portion and ladaptedto maintain a` dry reto increase the l gion in all paths of possible leakage from one metal part to the other.

'4. An insulator having a central portion provided with means for connecting conductors of dili'erent potentials to oppositeV sides thereof, a'disk portion, and oppositely flaring peripheral {ianges on said disk portion.

5. An insulator having a central portion tors of different potentials to opposite sides thereof, an integral disk portion, oppositely flaring {ianges at the periphery of said disk, and circular ribs between said ilanges and the central portion.

6. An insulator having a central portion provided with two circular passages extending therein from'opposite sides thereof and interlinking with each other, and an integral disk portion surrounding said central por' tion. A

7. An insulator having a central portion provided with two circular passages extending therein from opposite sides thereof and interlinking with each otherv without intersecting, and an integral rain delecting portion surrounding said central portion.

S. An insulator having two circular passages extending therein from opposite sides thereof in planes at right angles and interlinking with each other on opposite sides of rounding the central part of said insulator.

9. A n insulator provided with a peripheral trough and having two circular passages extending' into the body from opposite sides thereof and interlinked with each other with insulation separating them. l

10. .A strain insulator having connecting bands entering opposite sides, said bands interlocking within the insulator, and an in'- 'faces of the insulator to insure a dry surface in every possible path ofleakage.

1l. A strain insulator for high potentials comprising a series of interlocked units, each consisting of a vitrilied insulator having interiorly interlinking orifices opcninq on opposite lateral faces, interlinked strain pieces or bands in each orifice, and integral rainsheds adapted to maintain a dry region in all paths of possible leakage.

12. A disk strain insulator,` comprising suspension members, a mass of` insulating material partially enveloping the same, said mass being provided centrally with a disk integral therewith and lying substantially in the general equatorial plane of said mass, and further provided with angcs extending in opposite directions from said equatorial plane.

l13. .A disk strain insulator, comprising.k suspension members, a mass of insulating. material partially 'enveloping the Sarneand.

provided with means for connecting conduc' a. wall of insulation, and a disk portion surtegral rain-shed over-hanging the opposite Limes@ S having a disk portion, said disk portion bebeing provided with collars integral thereing provided with annular collars extending with and extending in opposite directions. l0

in opposite directions and in the general direction of Said suspension members.

14. A disk strain insulator, comprising strain members, a body of insulating material partially enveloping the same and having a comparatively large disk, said disk In Witness whereof l have hereunto set my hand this 19th day of April, 1907.

EDWARD M. HEWLETT.

Jitnesses:

BNJAMiN B. HULL, HELEN ORroRD.

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