US1494449A - Strain insulator - Google Patents

Description

May 20, 1924.

L. STEINBERGER STRAIN INSULATOR Filed April 9 1920 /nven for 1100/15 Si /1756 Patented May 20, 1924.

LOUIS STEINBERGER, 0F BROOKLYN, NEW YORK.

STRAIN INSULATOR.

Application filed April 9, 1920. Serial No. 372,389.

To all whom it may canoe m:

Be it known that 1, Louis STEINBERGER, a citizen of the United States, and a resident of the borough of Brooklyn, city and State of New York, have invented certain new and useful Improvements in Strain Insulators, of which the following is a speciiication.

My invention relates to strain insulators and one of the objects thereof is to provide an insulating body portion which is removably mounted upon the strain members of the insulator, but which is held from horizontal movement and which body also holds the strain members from turning relative to each other and thereby short circuiting the insulator.

Another object of the invention is to construct a strain insulator with a removable body of insulating material and with removable strain members so that the connecting or bridge portions of each of the strain members will be insulated respectively from the upright or leg portions of the other strain member.

Another object of the invention is to construct a body of insulating material pro vided with centrally arranged seatsfor the bridge portions of the strain members and radially arranged longitudinal conduits or holes for the legs of the strain members, and a plurality of projecting spaced ridges of insulating material which will be disposed between the bridge portions of one strain member and the leg portions of another strain member to insulate one from the other when the insulator is assembled.

Other objects will appear from the subjoined specification and claims.

' strain member being removed.

Fig. 2 is a vertical section with parts in elevation of an insulator embodying my invention.

Fig. 3 is an elevation of an insulator embodying my invention viewed in the direction of the arrow in Fig. 2.

The insulator may conveniently be made of any suitable moldable insulatingmaterial such, for example, as that known in the art as electrose, or it may be made of porcelain,

In the drawings in which the same refer-,

glass or other vitreous or fireproof insulating material.

The insulator body 13 is cylindrical in shape and is provided on its side with a series of circular grooves 70 and ridges 71 for the purpose of increasing the surface area thereof. Upon the upper and lower surfaces of the insulator body are provided centrally arranged projections of insulating material, the portions 72 and 73 extending in opposite directions in each of the ends and arranged centrally of the main body. These central projections are so shaped as to fit closely within the rings of the bridge portions of the strain members as will be hereinafter described. Projecting also from the upper and lower faces of the body of insulating material is a series of uniformly arranged similarly shaped ridges of insulating material 75 and 76 the latter of which are comparatively short and straight, and the former of which are so shaped as to properly insulate the strain members from each other after they are assembled with the insulator body, not only by forming walls of insulating material between the same, but also by providing an extended or enlarged surface area or an extended or enlarged path over the surface of the body of insulating material between the strain members in order to effectually insulate one from the other, thus increasing the length of the leakage path between the strain members.

At uniform distances from the axis at points arranged approximately 90 degrees from each other I provide four longitudinal conduits or holes 80, 81, 82 and 83 for the reception of the vertical legs of the respective strain members, as will be hereinafter more fully described. These conduits are arranged at a distance from the protruding ridges 75 and 76.

The strain members A and A are duplicates of each other, as clearly shown in the drawing, in which the bridge portions consist of rings 10 and 10 connected respectively to the leg portions thereof. The leg portions 12 and 13 of the strain member A and 12 and 13 of the strain member A are connected respectively to the rings 10 and 10 by the elbows 16, 17 and 16, 17, the elbows being connected to the rings at points diametrically opposite each other, the respective leg portions extending vertically therefrom. Each of the strain members is 'made up of two parts, the part-s30 and 31 of the respective strain members being screwthreaded at the ends of the respective leg portions. Likewise-the other separable parts 30 and 31 of the respective strain members are yoke shape and are'provided with projecting ends 34, and 34 and 35 which coincide with the screwthreaded ends respectively. of the leg portions 12 and 13 and 12 and 13 so that the two portions 39 and 31 and 30 and 31 of the respective strain members are secured together by engaging the nuts or sleeves 40 and 41 and 40' and 41.

In forming the body of insulating ma terial I mold it into the shape shown in the drawing in which there are two centrally arranged projections 72 and 7 3, one on each face thereby permitting the seating of the rings forming the bridge portions of the strainmembers over and around the said insulating projections 72 and'j73.

In assembling the insulator the body B is fitted to one strain member so that the projectingleg portions are brought into line with the oppositely disposed vertically arranged conduits passing through the insulator body and the central projection at one end of the insulator body is then permitted to seat itself within the ring portion of the strain member by allowing the insulator body to slide down upon the respective leg portions of the same strain member. When the body of insulating material is so arranged the ends of the legs of the other strain; member are set opposite the conduits V in the body portion which have been arranged to receive them and the legs of \the strain member are allowed to pass down through the said conduits, thus seating the ring portion of this strain member in its place around the central projection of insulating material in the other face of the insulator body B. The other separable portions of the strain members 31 and 31 are then placed in their respective positions and secured to the projecting legs of the complementary strain members by the respective sleeve nuts 4-0 and 41 and 40 and 41.

As will be understood from the above description and illustration in the drawing. the body of insulating material and the interlocking strain members may be very quickly assembled or disassembled and new bodies of insulating material or new strain members may be substituted forjthe-o'ld ones very quickly and readily.

The entire structure is so arranged that the insulator body is held by compression between the strain members and is also securely held against rotation about its vertical axis. Likewise the strain members themselves are held in fixed position with relation to each other by the body of insulating material so that there is no "danger of short circuiting between the strain mem bers.

The body of insulating material is so constructed on its face by insulating ridges and intervening grooves that the bridge portions of one strain member are effectually insulated from the leg portions of the other strain member.

As changes of construction could be made P within the scope of my invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention whatI claim as new and desire to secure by Letters Patent is:

1. In a strain insulator, a body of insulating material having central extensions, strain members having ring portions fitting respectively over said extensions, and leg portions connected respectively with the said ring portions, ridgeson the respective ends of the said body of insulating material situated between the respective ring and leg portions of the strain members for insulating said strain members from each other.

2. In a strain insulator, a body of insulating material having central extensions,

strain members having ring portions fittingrespectively over said extensions, and leg portions passing through the body of insulating material, said body being provided with ridges on the respective ends thereof situated between the respective ring and leg portions of the strain members for insulating said strain members from each other.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 2d day or April,1920.

LOUIS STEINBERGER. In presence of ZITA M. GnArzcAM.

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