US341778A - Incandescing electric lamp - Google Patents

Description

(No Model.)

L. STIERINGER.

INGANDESGING ELECTRIC LAMP. No. 341,778. Patented May 11, 1886.

WEST W Y M, PETERS, Phnln-Lim a ndnr. wum lm, D c.

UNITED STATES PATENT ()FFICE.

LUTHER STIERINGER, OF NElV YORK, N. Y., ASSIGNOR TO THE EDISON LAMP COMPANY, OF HARRISON, NEXV JERSEY.

lNCANDESClNG ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 341,778, dated May 11, 1886.

Application filed January 13, 1886.

To all whom it may concern:

Be it known that I, LUTHER STIERINGER, of New York city, in the county and State of New York, have invented a certain new and useful Improvement in Incandescing Electric Lamps, of which the following is a specification.

Heretofore when incandescing electriclamps have been used in series with currents of high electro-motive force, with an electro-magi'ietic cut-out device for closing a shunt around each lamp, when its carbon filament breaks difiiculty has arisen in the following way: If a break occurs in the filament, the current is apt to pass from the broken side of the filament below the point of fracture across the vacuous space to the other side, forming an are which follows down the carbomconsuming the same, and down the leading-in wires to the glass, which being intensely heated becomes a conductor of electricity, so that the current continues to pass through the glass from one wire to the other and so proceeds down to the lampsocket and cut-out mechanism so that these parts may be destroyed and the continuity of the series-circuit is finally broken. The passage across the carbon being provided for the current as soon as the carbon breaks the cutout mechanism 01" course does not act.

My invention relates to means for overconr ing this difficulty by breaking the are before it leaves the lamp, so that the electromagnetic cut-out will then act to shunt the lamp. I accomplish this by filling the stem or tube through which the leadingin wires pass out side of the exhausted globe with a refractory insulating material which is not injuriously affected by the heat of the are or current and prevents the are from passing from the wire to the glass, or from one wire to the other. The substance which I have found best to employ for the purpose is asbestus fiber, with which I fill the stem or tube. I have, however, tried numerous other substances with good results. Among these I may mention magnesium calcite, powdered soapstone, and terra-alba. These substances are efi'ective in operation, but the asbestus fiber is easier to handle and does not shift its position like the other materials, which are in-the form of powder. Any refractory insulating material not Serial X0. 188,446. (No model.)

broken in the stem of the lamp the cut-out v mechanism acts also in the same way.

Dly invention is illustrated in the annexed drawings, in which Figure 1 is a diagram of a portion of asystem ofelectric lighting embodying my invention; Fig. 2, a view in elevation of one of the lamps, and Fig. 3 a section of the stem of the lamp after the are has been formed and broken.

Like letters refer to corresponding parts in all these figures.

A is the exhausted inclosing-globe of an Edison electric lamp.

3 is the inner tube or stem. through which the leading-in wires c a pass, being sealed in the glass of said tube where they pass through it at Z).

G is the carbon filament, attached to said wires at cc, preferably by electroplated joint. \Vhen the are forms across the filament, it usually passes from the broken side thereof immediate] ybelow the fracture to the opposite clamps. Both sides of the filament are consumed at once and the wires usually are then consumed down to the glass, or nearly there. The current then passes across through the glass and usually consumes only one wire, a, as seen in Fig. Continuing on through the wires and glass the current continues to prevent the operation of the cutout, and finally reaches and destroys the socket and cut-out mechanism. Ihowever, as explained, fill the stem I3 with asbestus fiber D or other suitable material. The stopper E,inserted in the lower end of the stem, holds the asbestus in it and also keeps the wires apart. At first, as seen in Fig. 3, the wire continues to be consumed for a certain distance down into the asbestus that is, until the distance becomes so great that the current or are cannot pass from the end of the wire to the glass at b. As soon as this point is reached, itis evident that the arc must cease at once since the asbestus prevents it from reaching the other wire direct or from reaching the side of the tube.

In Fig. 1 is shown a cut-out devicewhich may be employed.

The lamps A A are in series in line L L in any suitable number. In a shunt, cl d, around each lamp is an electro-magnet, F, whose spring-retracted armature-lever G controls at e another shunt, f f. If circuit through the lamp is interrupted in either of the two ways above described, the magnet F attracts its armature and closes shunt ff around the lamp. A catch,g, is provided whichholds the shunt closed until the broken lamp is replaced by a new one, when the catch is withdrawn by hand and the shunt is opened again.

I am aware of United States Patent to Perkins, No. 287,3l4, dated October 23, 1883, in which is described the use of mineral wool placed in the stem of a lamp to prevent the conduction of heat down to the socket. Mineral wool is, however, nota material which is refractory under the heat of the are, and will not act to break the arc inthe manner above set forth.

having its leading-in wires within the glass stem separated from each other and from the glass by asbestus fiber or equivalent refractory insulating material, of electromagnetic cut-out mechanism for each lamp, substantially as set forth.

This specification signed and witnessed this 4th day of January, 1886.

LUTHER STIERINGER.

Witnesses:

A. W. KIDDLE, E. O; ROWLAND.

Images