US937447A - Insulator. - Google Patents

Description

M. T. A. KUBIERSGHKY & P. E. HERKNER.

INSULATOR.

APPLIUATION FILED 00T. 19,1904.

Patented 0@1;.19,1909.

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unir s: ras erica MARTIN T. A.- KUBIERSCHKY AND PAUL E. HEB/KNEE, F BERLIN, GERMANY.

INSULATOR.

T o all whom it may concern:

Be it known that we, MARTIN T. A. KU- BInRscI-IKY and PAUL E. Hnnnnnn, of Berlin, Germany, have invented certain new and useful Improvements in Insulators, of which the following is a specification.

The presentinvention relates to the suspension of electric trolley wires, and more particularly to insulating supports.

In the suspension systems heretofore in use, it has been the practice to provide one insulator at the point of connection of the trolley wire to the cross suspender wire and another insulator near each end of the suspender wire in order to obtain the necessary double insulation. rilhe first insulator is usually well protected from injury and against rain by a metallic casing having a circular projection, while the other insulators are not protected from injury nor is there any provision to keep off rain. The consequence is that while the end insulators perform their desired function in dry weather they entirely fail to act as insulators when wet. Moreover, the employment of three insulators to each cross suspender is objectionable both from esthetic and economical stand points.

The object of this invention is to provide an insulating support which will provide the necessary double insulation for the trolley wire, and fill the oftice of the three insulators heretofore necessarily employed and at less expense.

In carrying out the invention the inclosing shell is made somewhat larger than the shells of prior devices, and between the inner walls of the shell and the suspender bolt are arranged a plurality of thicknesses of insulation.

For a betterl understanding of the invention reference may be had to the following detailed description and the accompanying drawing forming a part of this specification in which,

Figure 1 is a vertical section of an insulating support embodying one form of the invention; Fig. 2 is a similar View showing an increased number of insulating layers and strengthening forms; Figs. 3 and 4L show modied forms of the insulator; and Fig. 5 is a top plan view of the insulator shown in Fig. 3.

In the construction shown in Figs. 1 and 2, the metallic holder 1 is provided with a downwardly projecting flange or petticoat Specification of Letters Patent.

Application led October 19, 1904.

Patented ct. 19, 1909.

Serial No. 229,205.

2 with a ledge or shoulder 3 projecting from its inner upper end, two wire engaging arms l extending radially from its outer surfaces, and' at its top edge with a threaded crown flange for the reception of a threaded cap 5. Supported on the ledge or shoulder 3 is an intermediate insulator 6 consisting of a metallic shell 7 having a discoidal top S and a ring flange 9 with shoulders 10 near its opposite edges and a layer of insulation 11 surrounding the outer surface of the cap. The object of introducing the metallic shell 7 is to give greater strength and to protect the first layer of insulation, provide a better seat for the second layer of insulation, and

toenable the assembled parts to be more.

readily tested individually by a volt meter. The inner surface of the flange 9 is screwthreaded for the reception of a ring nut 12 having an inwardly projecting shoulder 13 on its upper surface. Upon this shoulder a -second intermediate insulator 6 may be placed as in Fig. 2 or the insulated bolt 14; may be seated directly as in Fig. 1.

In the construction shown in Fig. 3 the holder 1 is made with an inverted recess 15 screw-threaded at its lower end for the reception of a removable petticoat 16 having a shoulder at its upper end. Upon this shoulder is seated a molded insulator 6 formed with an intermediate petticoat 17 and provided with a shoulder near its upper end for the reception of the head of the insulated bolt 141-. Over the upper end of the bolt a layer 18 of yieldable insulating material is placed.

In the construction shown in Fig. a the intermediate insulator 6 is supported as in the construction shown in Figs. 1 and 2, but instead of supporting the insulated bolt 14 at the upper end thereof the lower end is provided with a depending flange 19 screwthreaded to engage a thread upon the upper end of a shouldered petticoat 2O adapted to support the insulated bolt 1 4.

l/Ve do not desire to restrict ourselves to the particular form or arrangement of parts herein described, and shown; since it is apparent that they may be changed and modified without departing from our invention.

What we claim as new and desire to secure by Letters Patent of the United States, is:

1. The combination of a metallic supporting shell having ascrew-threaded portion,

an insulated bolt, an independent insulator surrounding saidA insulated bolt to effect double insulation thereof, and a removable metallic part in engagement with the screwthreaded portion of the shell.

2. The combination of a metallic supporting shell, an insulated bolt, and an independent iiisulator surrounding said insulated bolt and consisting of a shouldered metallic form With insulating material secured to the surface thereof.

3. The combination of a shouldered metallic shell, an insulated bolt, and an independent insulator consisting of a metallic form surrounded by insulating material and having a removable inner shoulder.

il. The combination of a metallic shell, an insulated bolt, a plurality of independent insulators surrounding' each other and the said insulated bolt whereby a multiple iiisulation is interposed between bolt and shell,

and means for detachably connecting said parts together.

In Witness whereof We have hereunto set our hands this twenty-ninth day of September, 1904.

MARTIN 'l. A. KUBIERSCHKY. PAUL E. HERKNER.

Titnesses HENRY HASPER, WOLDEMAR HAUPT.

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