US2331481A - Insulator - Google Patents

Description

12, 1 943. KRUEGER 2,331,481

' msuum'on Filed Oct. 13, 1942 INVENTOR.

Herr l an S. Krueger BY Hwy}. at.

Patented Oct. 12, 1943 UNITED" STATES PATEN T OFFICE 2 Claims.

This invention relates to improvements in insulators, and it has particular relationship to insulators which are now in use on mono rail hoists, and the objects of my improvement are as follows:

First, to provide an insulator particularly well adapted for use where it it exposed to moisture due to climatic and building conditions.

Second, to provide an insulating structure through which a bolt or rod iron extends to support the insulating structure from below or from above and which includes conductor clamping means of non-conducting material.

Third, to provide an insulator consisting of three or more parts, two of which are of equal design so that they can be interchanged.

Fourth, to provide a simple device for the purpose stated above, which is light in weight and simple in construction to be manufactured and sold at a very reasonable price.

Further objects of the instant invention reside in any novel feature of construction or operation or novel combination of parts present in the embodiment of the invention described and shown in the accompanying drawing.

In the drawing:

Fig. 1 is a front elevation of the insulator; Fig. 2, a side elevation of the insulator; Fig. 3, a bottom plan view of the insulator; Fig. 4, a front elevation of a modification of a part of the insulator; and Fig. 5, a plan view of this modification.

Similar numerals refer to throughout the several views.

In Figs. 1 to 3 the numeral I designates a T-shaped top plate of porcelain or other suitable dielectric material having an aperture 2 in its center and grooves 3 for a break in moisture on its face 4, on the bottom 5 of its broader part, on its front side 6, and on its rear side I. A bottom plate 8 is of exactly the same design and material and is also provided with the same grooves 3 as the top plate I; so that if a top or bottom plate breaks, it can be replaced by a duplicate of either a top or a bottom plate.

similar parts Between the top plate I and the bottom plate.

8 are U-shaped plates 9 and II! of porcelain or other suitable dielectric material. Each of these plates 9 and III has an aperture II in its center and two ledges I2 adjacent the inner side of each flange I4. The ledges I2 are adapted to support the contact rails I5. The plates 9 and IQ are also provided with grooves .3 adjacent the ledges I2 as well as at the front and rear sides. One of the U-shaped plates is provided with spacing posts IE to keep the plate 9 spaced at a distance from the plate I0 so that air can pass through between the plates 9 and I0. In the present instance, plate III is provided with four spacing posts I 6.

According to the modification of the invention shown in Figs. 4 and 5, one double-T-shaped plate H can be used instead of the two U-shaped plates 9 and I0. The top and bottom sides I8 and IQ of plate I! are of the same design as the top side 29 of plate 9, and the plate IT is also provided with an aperture I I, with ledges I2, and with grooves 3.

The apertures 2 and II can be made as round holes large enough to allow a threaded hanger bolt 2| to pass through. However, I prefer to provide the apertures with drain slots 22 to drain any water which might form on or in the insulator.

In order to prevent the plates from being pressed toward each other too strongly when tightening the nut 23, what might result in a cracking of the plates, a spring or an elastic washer 24 is placed between the nut 23 and the plate I. This elastic washer may be of any approved design, preferably consisting of a piece of sheet steel, the ends 25 of which are bent inwardly as shown in Fig. 1. The washer 24 is provided with an aperture in its center for the passing through of the bolt 2I.

While there has been shown and described and pointed out the fundamental novel features of the invention as applied to only two modifications, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated may be made by those skilled in the art without departing from the spirit of the invention. It is the intention, therefore, to be limited only as indicated by the scope of the following claims.

What is claimed is:

1. An insulator comprising a T-shapecl top plate of insulating material having an aperture in its center and grooves for a break in moisture on the face, on the bottom, on the frontside and on the rear side of its broader part; a bottom plate of insulating material being of exactly the same design as said top plate; two U-shaped intermediate plates of insulating material between said top and bottom plates, each of said U-shaped plates having two ledges adjacent the inner side of each flange to support contact rails clamped between said top, bottom and intermediate plates, grooves for a break in moisture adjacent said ledges and at the front and rear sides, and an aperture in its center placed at a distance from said ledges; spacing posts between said U-shaped plates; a threaded bolt extending through said apertures and adapted to support the insulator; a nut on said bolt; and an elastic Washer between said nut and the insulator, substantially as described.

2. An insulator comprising T-shaped top and bottom plates of insulating material, each having an aperture in its center and grooves for a break in moisture on the face, on the bottom on the front side and on the rear side of its broader part; a double-T-shaped insulating plate between said top and bottom plates, said double-T-shaped plate having four ledges adjacent the inner side of each flange to support contact rails clamped between said top, bottom and intermediate plates, grooves for a break in moisture adjacent said ledges and at the front and rear sides, and an aperture in its center placed at a distance from said ledges; a threaded bolt extending through said apertures and adapted to support'the insulator; a nut on said bolt; and an elastic washer between said nut and the insulator, substantially as described.

HERMAN KRUEGER.

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