US602404A - John mueller - Google Patents

Description

J MUELLER.

ELECTRIC ARC LAMP.

(No Model.)

No. 602,404. Patented Apr. 12,1898.

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JOHN MUELLER, OF CLEVELAND, OHIO, ASSIGNOR TO THE DUPLEX HANGER COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 602,404, dated April 12, 1898.

Application filed August 2'7, 1897. Serial No. 649,672. (No model.)

To all whom it may concern: the top by the upper plate B, with which they Be it known that I, JOHN MUELLER, a citimay be integral, and at the bottom are united zen of the United States, residing at Oleveby the collar 0, through which passes the land, in the county of Ouyahoga and State of holder for the lower carbon.

Ohio, have invented certain new and useful D is a tube in which slides the holder d for Improvements in Arc-Lamps; and I do herethe upper carbon, and 011 which holder is the by declare the following to be a full, clear, usual clamp e, fitted to slide smoothly thereon and exact description of the invention, such and provided with a projecting rim or arm 6 as Will enable others skilled in the art to with which the lifting-leverf engages to lift [0 which it appertains to make and use the same. the clamp and holder,as hcreinafterdescribed.

My invention relates to improvements in The top plate 13 is provided with the usual electric-arc lamps. binding-posts b l), insulated therefrom to The object of the invention is to increase which the main circuitis connected, and may the efficiency of the lamp; and it consists in also be provided with binding-posts or con- I5 the novel features of construction, combinanections for any rheostat or shunt connections tion, and arrangement of parts hereinafter desired, as b If The lower carbon is confully described, and specifically pointed out nected, as by conductor 0, to the post I). To in the claim. the lower part of post I) is joined one end of In the drawings, Figure l is a view in elea thermo-expansive strip 72, whose other end 20 vation of an electric-arc lamp constructed acis connected to one arm of a lever 2', pivotally 7o cording to my invention, and Fig. 2 is a like supported on, but insulated from, the lamp- View of the lamp taken at right angles to the frame. A similar expansive strip 7L2 joins view shown in Fig. 1. Fig. 3 is a detail showthe other end of lever 2' to one end of a crossing, on a larger scale, the feed-clamp and its lever j, pivoted on, but insulated from, the

2 5 connections, &c. 3 and Figs. 4 and 5 show frame. To the other end of lever j a third variations of the arrangement of the strips. expansive strip 713 is connected and joined to In electric-arc lamps wherein the feedingone end of a lever 2' also pivoted to, but inclamp which lifts the upper carbonis actuated sulated from, the lamp-frame, and the other by the expansion and contraction of a thermoend of lever 2' is joined by a fourth expansive 3o expansive conductor or by the joint action of strip h to the lifting-lever f, pivoted on, but such conductor and a spring there has been insulated from, the frame. A spring Z actuexperienced great difficulty in securing at the ates the lever f in such manner as to lift its same time sufficient delicacy of action and a free end f, which is adapted to engage the sufficient extent of movement, owing to the arm or collar 6 of clamp e. I

3 5 limitations in the size of the lamps, which are, The strips h h h3 h and levers 2', 2' and j are for commercial reasons, necessary. Attempts so proportioned that when cold the free arm have been made to meet this difficulty by f of lever f will be depressed against the tencausing such thermo-expansive strip to act sion of spring Z, so as to allow clamp eto rest upon the short arm of a lever and to multiupon a fixed stop, as 70, and consequently the 40 ply the movement of this arm by giving the upper-carbon holder will by its gravity slide other arm an increased length; but this downward until the carbon rests upon the method multiplies the resistance also and has lower carbon. If current is now turned on, proven, in practice, to be objectionable, as it will pass through the strips h 7L h3 if and have all other attempts to overcome this diffitheir connectinglevers to the holder d and 5 culty. through the carbons, and will by its passage 5 By the construction shown I have, after heat and expand the strips h 7t 71, 72 which much experimenting, finally overcome the will allow the spring Z to lift the arm f into difficulty. contact with the rim 6 and as arm f continues In the drawings, A A are the side bars of to lift it will tilt the clamp c and cause it to 50 the ordinary lamp-frame and are joined at lift the upper carbon, thus forming the arc. 10o

As the increased resistance diminishes the quantity of current passing the strips h 7L2, &c. contract and draw down the arm f, thus allowing the carbon to descend and shorten the arc, whereupon the current through the expansive strips increases and expands them again, and thus the alternate expansions and contractions feed the carbon down steadily, so as to maintain an almost constant resistance at the arc and hence a steady light without flickering or hissing. So great is the sensitiveness of this device that one-third of the current will operate it which is required to operate the feed with a single expansive strip.

By the construction shown I obtain more than four times the length of expansive strip which is possible with a single strip, and I obtain a perfect regulation of the are, which has been found by repeated trials to be impossible with the single strip.

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

In an arc-lamp the combination with the carbon-holding devices and a feeding-clamp having sliding engagement with the uppercarbon holder, of a lifting-lever adapted to engage and lift said clamp, a spring acting on said lever to cause it to engage said clamp, a cross-lever pivoted on the lamp-frame, auxiliary levers as L' 2' and thermo-expansive strips connecting the auxiliary levers respectively with the cross-lever and the liftinglever, and with the cross-lever and a bindingpost to which the main circuit is connected, substantially as described.

In testimony whereof Ihereto affix my signature in presence of two witnesses.

JOHN MUELLER.

Vitnesses:

L. J. RANDALL, LOREN PRENTISS.

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