US1458756A - Strain insulator - Google Patents

Description

June 12,1923. 1,458,756

' W. T. GODDARD STRAIN INSULATOR Filed oet, 25 1919 2 sheets-sheet 1 June'V 12, 1923.` 1,458,756

w. T. GODDARD Y STRAIN INSULATOR Filed oct. 25, 1919 2 sheets-sheet 2 Wafer 776mm@ Patented June 12, 1923;

PATNT OFFICE.e

UNITED STATES WALTER T. GODDARD, OF HAMILTON, ONTARIO, CANADA, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO LOCKE INSULTOR- UORPOHATION. OF BALTIMORE, MARYLAND, A

CORPORATION OF MARYLAND.

STRAIN INSULATOB.

Application led October 25, 1919. Serial No. 333,157.

To all whom t may conccm:

Be it known that I, lVAL'rEn T. GoDDARo, of Hamilton, in the Province of Ontario and Dominion of Canada, have invented certain B new and useful Improvements in Strain Insulators; and I do hereby declare the following to be a full, clear, and exact description 'of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference numerals marked thereon.

My present invention relates to electrical appliances and more particularly to insulators of the kind usually employed to support heavy loads on high tension lines and it has for its object to provide an improved construction in which the attached parts of the insulator, usually comprising a silicious frangible element and a metallic attaching element, are held together in a Way that distributes the strain through the mass of the frangible element. To these and other ends the invention residesin certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the. drawings Figure l is a side View of a strain insulator unit partially broken away, constructed in accordance with and illustrating one embodiment of my invention; Figure 2 is an enlarged fragmentary view of a head of the insulator with the cap removed, together with one half of the arcing ring;

Figure 3 is an enlarged top insulator with the cap removed;

Figure 4 is a fragmentary section on the view of the 40 line 4-4 of Figure 3;

Figure 5 is an enlarged top view of the insulator partly broken away; 4

Figure 6- is a horizontal section on the line 6--6 of Figure 4, and

Fi ure 7 is an enlarged fragmentary view showing a detail of the cap.

Similar reference numerals throughout the several views indicate the same parts.

This invention is an improvement on that described and claimed in my prior and pending application, Serial No. 273,145 filed January 25, 1919, which discloses the functions and advantages of a certain method of lacing the frangible silicious element of a strain insulator to its connected part so that the strains will be distributed uniformly through the frangible mass to enable it to withstand heavier loads, I will therefore not go into detail in describing this part ol' the present disclosure.

The insulator I have illustrated in the present instance embodies a ribbed or flanged cylindrical column l of frangible silicious material such as the ordinary porcelain used in such instances with attaching a ring 2 at each end for connection with asupport or with the body to be supported or with another unit of the same nature, as the case may be, these units being often used in multiples and connected together. As both ends or heads embodying the rings 2 are alike, a description of one will suffice for both.

Referring more particularly to Figures 2, 3 and 4, the solid porcelain enlargement 3 at the head of the column 1 is pierced by a number of annularly disposed staggered apertures 4 and on top of the head is placed a concentric disc 5 having an embossed perforated center 6, to receive the ring bolt 7 having the .head 8 engaging beneath the embossed portion. At the margin of the disc 5 is an annular r'ib 8a on the inner circumference of which the disc is pierced by a ring of apertures 9. A flexible continuous cable 10 having its ends suitably fastened together asindicated at 1.1 in Figure 3, is laced through the openings 4 and. 9 of the porcelain and the attaching disc so that its loops embrace the portions 11a of the former and extend around the annular rib 8a of the latter. The said Hexible member can thus slide around and adapt itself so that it bears with an equal pressure at all points and the strain is distributed through the mass of the porcelain.

It is desirable` in order to effect a true selfadjustment of the flexible member, that it be subjected to a preliminary strain prior to the imposition of the stra-ins created by actual use of theinsulator in its intended capacity and 4in the practice of my present invention. I provide devices for. doing this which devices are further capable of imposing a greater seperating strain between the porcelain and its attaching member without imposing upon the former any tenslle strain whatever. To these ends, I thread o' er 'te Vnot onlyv to adjust the lacing; in the taut a the two elements 1 and 5 are practicaly rigidly connected as ,no relatire ino venient is -oernntted between theni. 1n tightening the screws., it will be noted that their pressure is exerted against the portions 11 and in onposition to 'the Contact of the lacing` therewith which acts against the screw on the opposite side. The actual strain on the porcelain is therefore one of compression which this substance is able` to withstand to high degree and isnot in the nature of a tensile `strain such as would be exerted on the portions 11"L it the lacing was used Without the compression ineinber to resist tie pall imposed by the use of the insulator suspension support. yTheretore7 the screws7 to Whatever degree they may be tightened elo not impose upon the porcelain any strains detracting from its capability ot withstanding the strains o? actual use.

The fieiribl@ member or lacing 10 would or- 37 be composed ot inetal and as such. probably constitute the arcing1 point fe insulator, thereby inipairing ite strength. i therefore provide the inet lhc aicinc;- ring 14; on the lower portion of the iA sulator head FS which niavle of two semi-circular sections as shown in Figure G, bolted together 15 by Webs 1G connecting' them to semi-circular inner rneuibers 1! jointly orniing band that encircles and secures the ring to the head. 1' then f t over thel head 'an annular cap 18 that entends ,in the central portion oi the disc 'over lacing 10 complet-ely housin it downwardly into electrical Contact with the structure of the arcing ring 14- 'or which is slotted at 19 as shown in Figover the y'ebs 16. 1t. Wili seen ai. cap and the ring iguiiy protect the i@ and prevent a passito-ie from Y have with H GS

f' a or tie suspen- Will recogop' cation is possible to supe insulators. Ventionz manner pointed out.` but thej.7 also hold it so A. [rained to the tllerein newerL elenimt, one o. wir l is f3 br the other through the medium o' tina-ous flexible member laced thrmigh the. apertures in lii `ngiblo element. o means `tively imposed betwee the elements erting a separatingstrain thereon to sticch the fiexibienienibe and d' ibute the in amou he points of bearing' ot -tleible meunier on said frangible element,

2. a strain insulziitor. thc combination with Ya frangible element oi insulating' man 'terial haring; apertures 'therein and a conH nccted element. one of' which is supported bj.' the other through the inediuin o'li al coutinuous iexible neinber laced through the apertures in the trangrible element. oi a de- Vice for stretching said exible member5 said device being arranged to act against one ele nient and react against the other to exert causing' the flexible Lneniber to be stretched so that its ap''ilication or" force to the iraneieinent is distributed.

in a strain insuiator, the combination a frangible element of insulating inaharing res til-@reinar l a om 1d element. one of which is supported bj; the otherthroug'h the inediuui o l a continuous flexible ineniber laced through the roei-tures in the Yrangible element, ot a jaclr e/rcw threaded into the connected element and bearing; against the trangible element 'to l rt a separating;- strain operating to stretch the -eiiible ineinl e and distribute its application of force among its bearing' points.

5. n a strain insu or.' the combination nectel element. one of which is supported by' the other through the. medium of a continuous flexible meniber laced througijh the aber 'tures in the trangible element7 oiE an arcingr ring secur d to the 'lirangible element adjacent to the lacing and cap for the Coi'inected element housingu the lacing, and eieotricalij/ Ging i

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