US1776557A - Pedestal insulator - Google Patents

Description

P 1930- I K A. HAWLEY 1,776,557

' PEDESTAL INSULATOR Filed Nov. 27, 1926 Patented Sept. 23, 1930 UNITED STATES PATENT OFFIC'E'" KENT HAWLEY, OF BALTIMORE, MARYLAND, ASSIGNOR TO LOCKE INSULATOR CORPORATION, OF BALTIMORE, MARYLAND, A CORPORATION OF MARYLAND PEDESTAL I INSULATOR Application filed November 27, 1926. Serial No. 151,132.

The invention relates to insulators, particcoupling and greater cantilever strength for ularly those of the pedestal type. the same diameter of head or cap and also for The object of the invention, generally the same space or height of insulator. stated, is to provide an insulator of this or Another object is to provide a cap of this an analogous character having an improved character which will allow the utilization of 55 form of cap thereon provided for the purthe waste space which is ordinarily present pose of attachment of adjuncts or other units at the top of the usual type. of pedestal insulathereto. tor without decreasing the flash-over value of:

It is well known that pedestal insulators of the insulator.

various ordinary and well known types are Still another object is the provision of an 60 equipped with caps cemented in place, the insulator of this'character in which the bringcaps having thickened portions inwardly of ing down of the cap closely onto the dielectric their peripheries drilled and tapped for the body will greatly reducethe thickness of cereception of securing screws or bolts providment necessary for efiecting securing, the reed for fastening other parts thereto. Caps of duction of the mass of cementitious material 65 this usual form are cemented in place upon being of importance as a smaller mass is less the dielectric body of the insulator but owliable to crumble or crack than a large one, ing to the presence of the thickened portions and less apt to deteriorate from the absorpin which the tapped holes are formed there tion of moisture.

is a thick mass ofcement between the top of An additional object of the invention is 70 the dielectric body and the underside of the to provide an insulator including a cap thereinner or major portion of the cap. This is for which will be simple and inexpensive to disadvantageous for several reasons, one of manufacture, easy to assemble, positive in which is that the dielectric body enters the action, efficient and durable in service, and a cap to a comparatively small extent, ordigeneral improvement in the art. 75v

narily about one-half the height of the cap. With the above and other objects and ad- Another objection is that the employment vantages in view, the invention preferably of such a large or thick mass of cement deconsists in the arrangement and combination tracts from the mechanical strength of the of parts and detailed structural features to insulator as there is always more or less posbe hereinafter more fully described and so sibility of crumbling or cracking of the ceclaimed, and illustrated in the accompanying ment itself especially as it does not expand or drawing in which: i contract to the same extent as the metal cap Figure 1 is a view partly in elevation and dielefitlic y under -P 1 partly in section showing an insulator emchanges. bodying the invention,

It is with the above facts in view that I Figure 2 is a top plan view of the cap. have designed an insulator of this type 6111- Referring more particularly to the drawbodying a cap into which the dielectric body ing, it will be seen that I have illustrated an may enter to a much greater extent, with a insulator of the pedestal pin type which, as 40 corresponding reduction in the thickness of is well known, comprises a dielectric body 1, the cement mass, the thickened portions generally of porcelain, including a skirt porwhere the tapped holesare located extending tion 2- having depending petticoats 3, and outwardly beyond the periphery of the cap or formed centrally with a recess 4 within which the major portion of the periphery instead is cemented, at 5, a pin 6 rising from and 45 of lying within the confines of the projected preferably formed integrally with a base 7 upper edge of the dielectric body. usually flanged at 8 for connection with an Another object of the invention is to proadjacent unit or support. The dielectric rvide an insulator of this type with a cap body is further forme with an upstanding which fits down closel upon the dielectric and generally tapered reduced extension or 50 body and which will t erefore give a closer stem 9 upon which is mounted a cap. As

stated above, the caps ordinarily used are provided with thickened portions located within the confines of the projected upper edge of thestem. The ordinary type of cap is not illustrated as it is replaced by the novel cap of the special design to be described.

In carrying out the invention, I provide a cap indicated generally at 10, this cap being of the same general shape as the stem 9 soas to fit thereover in comparatively snug relation thereto. This cap includes a top wall portion 11 and a side or bell portion 12 which has its inner periphery provided, near its open. or lower end, with a series of steps or alternating ribs and grooves 13 and 14 respectively. This cap is held in place upon the stem 9 as by means of suitable cementitious material 15. 3

WVhereas the ordinary cap for insulators of this type is provided with thickened portions located inwardly of the periphery, the cap of the present invention is formed with outwardly extending thickened portions or lugs 16 which project radially and which are drilled or otherwise formed with holes 17 tapped as is customary, for the reception of screws or bolts for fastening another element Owing or a desired adjunct to the insulator. to the fact that these lugs 16 are provided located outwardly of the periphery of the stem 9 it will be clear that the stem 9 may enter the cap 10 to a point close to the underthe invention is not specifically limited these details inasmuch as the disclosure 1s merely an exemplification of the principles 1 involved. In fact I reserve the rightto make In an insulator, a body of dielectric Ina-- terial having an upstanding tapered stem portion, a metal cap secured upon said stem portion in embracing relation thereto, said cap having an outstanding circular flange and formed at a plurality of spaced points,

with outwardly extending thickened ortions or enlargements at the underside o the' flange and merging thereinto and into the side wall of the cap, said thickened portions being formed with threaded o enings located.

outwardly of and laterally yond the insulator engaging portion of the cap.

In testimony whereof I aflix my signature.

- KENT A. HAWLEY.

side of the top wall 11 thereof, there being I only a small space between the two and consequently only a thin layer of cement as compared with the usual thick mass. Obviously, the over-all length of an insulator having the improved cap thereon will be less than that of one equipped with the ordinary type of cap without there being any decrease in the length or height of the dielectric body. There is clearly closer coupling and consequently a greater cantilever strength for the same diameter of cap. In accordance with the present invention aporcelain body of greater length or height than usual may be used for an insulator of a certain over-all height and the flash-over value will be consequently increased. I

From the foregoing description and a study of the drawing it will be apparent that I have thus provided a simply constructed, inexpensive and easily assembled pedestal insulator which will be highly eflicient and which will possess many obviousadvantages over those of the ordinary variety in point of While I have shown and described emit v'ention as a plied to .a post or pedestal insulator and ave illustrated a certain conur th ref it ehoul be underetood that

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