US397218A - Sigmund bergman n - Google Patents

Description

(N o Model.)

S. BERGMANN.

INSULATING PIPE GOUPLING.

Patented Feb. 5, 1889.

UNITED STATES PATENT OEEicE.

SIGMIND BERGMANN, OF NEV YORK, N. 'I'.

INSULATlNG PIPE-COUPLING.

SPECIFICATION forming part of Letters Patent No. 397,218, dated February 5, 1889.

Application filed June I2, 1888. Serial No. 276,835. (No model.)

To all IN1/0m it 71mg concern,.-

Be it known that I, SIGMUND BERGMANN, of New York, in the county and State otl New York, have invented an Improvement in Coupling-Pieces, ot' which the following a speciiication.

My improvement relates to coupling-pieces employed to connect a gas-supply pipe with a chandelier or xture used for both gas and electric lights. In such chandeliers or lixtures it is desirable to so insulate the joint that the electric current will not ground. through the gas-supply pipe.

In the accompanying' drawings, Figure l is a side elevation of a coupling-piece embodying my improvement. Fig. 2 is a vertical section thereof, taken through the axis of the gas-passage. Fig. 3 is a horizontal section ot the same, taken on the plane ot the line n ar, Fig. 2.

A A designate two halves or portions ot the coupling-piece. These maybe made of metal-as, for instance, brass. Each is provided with a shank portion, a, and flanges a. The shank portions a are hollow and screwthreaded internally to receive within one the gas-supply pipe and within the other the stem of the chandelier or fixture. Between the ilanges a are pieces of insulating' material, a? a3 at. v The pieces a2 0.3 may be made of leather. The piece a is made of mica and is placed between thc pieces a? a3,

gas. It will be seen, also, that the metal adjacent to the insulating material is circumt'crent-ially fchamt'ercd, as at c c', providing an enlarged cavity, whereby a large surface ol' insulating material is exposed. Iv these means the carbonaceous or other material through which a short circuit is effected has a much greater surface to forni over than is the case in the old forni ot coupling-piece7 to which I have referred, whereby a very much longer time is required to effect a short cir` cuit, and the life ot the coupling-piece is materially prolonged. B v placing a sheet of mica between the portions of insulating material o? a3 the com ilete im ireOnation ot` the l D Coupling-pieces for thepurpose specified have previously7 been made comprising the pieces A A and a piece ot' insulating material between them; but the insulating material has been so formed or cut away as to be iiusli with the bore of the coupling-piece, and being comparatively thin, the passage ot gas through the coupling-piece has caused a de- ,l

posit of carbon or other conducting material across the insulating material and between the portions A A', occasioning a short circuit resulting in a ground, or thc short circuit has been occasioned bythe impregnation ot the insulating material with tarry matters or other substances from the gas.

In the example of my improvement illustrated in Figs. I, Q, and 3, it will be seen that the pieces of insulating material a2 a3 extend inwardly beyond the wall ot the gas duct or passage of the coupling-piece, so that acomparatively-restricted opening, b, is left through the insulating material for the passage of the portions a? ai with tarry or other conducting matters is avoided and the tendency to short j circuit from this cause overcome.

The portions A A maybe secured together by screws g, passing through insulators in the ilanges a and the insulating material.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. A couplingpiece comprising metallic portions provided with communicating gaspassages, and insulating material between said metallic portions extending inwardly beyond the walls of the gas-passages, said gaspassages comprising an enlarged cavity ad jacent to the insulating material, substantially as specilied.

i. A coupling-piece comprising metallic portions provided with communicating gaspassages, and insulating material between the metallic portions extending inwardly beyond the walls ot the gas-passages, the walls of the gas-passages adjacent to the insulating material being cham'lered ot't, substantially as specitied.

A couplingpiece comprising' metallic jjiortions provided with communicating gaspassages, pieces of insulating material between said metallic portions, and mica between said pieces lof insulating material, substantia-lly as specified.

i. A coupling-picce comprising metallic portions having communicating gas-passages enlarged at their inner ends, and insulating material between said metallic portions, substantially as specified.

SIGMUND BERGMANN.

Witnesses: l

P. H. KLEM, .I r., JN0. F. GEIDEL.

IOO

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