US1234951A - Globe for electric-arc lamps. - Google Patents

Description

T. STAVE.

GLOBE FOR ELECTRIC ARC LAMPS. APPLICATION FILED 050.23. 1912.

PatentedJuly 31, 1917.

F INVENTOR W|TNESSESi ATTORNEY UNITED STATES PATENT FFICE.

THEODORE STAVE, OF NEW YORK, N. Y., ASSIGNOR TO WESTINGHOUSE ELECTRIC 85 MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

GLOBE FOR ELECTRIC-ARC LAMPS.

Specification of Letters Patent.

Patented July 31, 191'7.

Application filed December 23, 1912. Serial No. 738,239.

To all whom it may concern Be it known that I, THEODORE STAvn, a subject of the King of Italy, and a resident of New York, borough of Manhattan, county and State of New York, have made a new and useful Invention in Globes for Electric- Arc Lamps, of which the following is a specification.

My invention relates to globes for inclosed arc lamps and particularly to those employing smoke producing carbons or electrodes, and has for its object, a more complete prevention of the deposit of the products of combustion evolved from the are, on the inner surface of the globe. I am aware that various means have been suggested to avoid such deposits, among which I may particularly mention the provision of a condensing chamber located immediately above the inclosing glass globe and in free communication therewith, the principle being to cause the combustion products to ascend and condense by virtue of the difference in tempera ture between the combustion chamber and the condensing chamber.

It has been found, however, that this purpose is not properly accomplished, particularly in cases where are lamps are subject to severe climatic conditions and where sudden changes in the temperature of the atmosphere occur. The cooling elfect of the outside air on the globe is such as to materially interfere with the above-mentioned condensing principle; causing the globe to be partially clouded during the time that the lamp is in operation and particularly toward the end of the trim.

I am aware that it has been suggested that this difficulty could be overcome by the use of an outer globe and an inner globe, but even this arrangement has been found to be far from satisfactory, because the air in the space between the inner globe and the outer globe will carry away a considerable amount of heat from the inner globe to the outer globe by convection. I propose to minimize the total dissipation of heat from the inner globe by using a globe with double walls and having the space between these two walls more or less completely evacuated of air.

By my construction the only dissipation of heat from the inner wall of the globe to the outer wall is caused by radiation and, therefore, the temperature in the chamber formed by the inner walls of the globe is kept approximately constant and higher than that of the similar globe of the usual construction, and for the same reason very considerable changes in temperature in the outside atmosphere will but very slightly affect the inner wall of the globe.

The result of my construction will be the greatest possible difference of temperature between the arc inclosing chamber and the condensing chamber at all times. This will cause a very much larger percentage of the hot vapors and fumes to flow into the condensing chamber and, therefore, leave the inner wall of the glass globe far more free from deposits than would any other known construction.

My invention will be understood by re ferring to the accompanying drawings, in which,

Figure 1 shows in side elevational view the mechanism inclosing part of a flaming arc lamp with its condensing chamber in dotted lines, the improved form of my invention being shown in sectional lines and the means of attaching the same to the base of the lamp in full lines.

Fig. 2 is a detail sectional view of the lower base plate or ring of a lamp forming part of the condenser, such as is shown in Fig. 1 with my invention attached.

Referring now to the drawings and first to Fig. 1, a and (5 represent a globe with double walls and of integral structure secured to the base plate or ring 0 of a flaming arc lamp having the usual form of condensing chamber C for collecting the particles of the products of combustion as they ascend, said globe being secured to the base plate or ring 0 by a bail or holding device 7 of well lmown form and in the usual manner. This double wall globe is preferably madeof the form shown in Fig. 1,- the inner wall being preferably of the form of a frustum of a cone and adapted to directly and closely surround the carbons of the arc lamp (not shown) the outer wall a being substantially the form shown in Fig. 1, so as to distribute the light with the best elfect. These two walls, inner and outer, are molded into one integral globe and provided with a well known exhaust extension 2' which, after the air is exhausted between the inner and outer walls to the desired degree of rarity, is sealed ofi? as shown. It is then adapted to be secured to the base plate or ring 0 which is provided with a carefully machined surface against which the upper portion of the globe fits with accurate nicety. b is a ring or extension integral with the base plate and against which the outer wall a of the globe rests, thus preventing displacement, parts of the base plate 0 and upper part of the globe a(Z being ground so as to make the best possible air tight j oint on the upper surface; the globe is then secured to the lamp base in the usual manner by the bail Having thus described my invention what I claim and desire to secure by Letters Patent of the United States is 1. In a flaming arc lamp, the combination with a member having a condensing chamber and embodying an annular base portion, of an integral double-walled evacuated globe having an annular upper portion engaging said annular base portion and making a tight joint therewith.

2. In a flaming arc lamp, the combination with a member having a-condensing chamber, of a double-walled evacuated globe detachably positioned in intimate engagement with the bottom of said member for maintaining a relatively high temperature in the space within said globe.

3. In a flaming arc lamp, the combination with a member having a condensing chamber and embodying a fiat annular bottom surface, of a detachable double-walled evacuated globe having a fiat annular top surface adapted to register said flat annular bottom surface of said member to provide a tight joint between said member and said globe.

4:. A globe for are lamps comprising an open-ended integral member having spaced outer and inner walls between which the air is exhausted, said globe being provided with a flat annular surface at its open end.

5. A double walled globe for flaming arc lamps, the walls being located one Within the other, the inner wall being substantially in the form of a frustum of a cone, and the outer wall of substantially spherical form, the space between the walls being substantially exhausted of air.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THEODORE STAVE.

WVitnesses:

C. J. KINTNER, M. F. KEATING.

Copies of this patent may be obtained for five cents each, by addressing the Gommissionei' of Patents, Washington, D. C.

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