US635851A - Electric-arc lamp. - Google Patents

Description

No. 635,85I. Patented Oct. 3|, I899.

c. E. HABTHAN.

ELECTBlC ARC LAMP.

(Applicution filed. Apr. 23, 1898.) fl J 2 Sheets-Sh0at l.

FE! l l WITNELEJEIEE- INVENTEIR- man/ w N0. 635,85I. Patented Oct. 3|, I899.

C. E. HABTHAN.

ELECTRIC ARC LAMP.

(Applicltion filed Apr. 28, 1898.)

2 Sheets-Sheet 2.

- (Ila Model.)

[TE-Z.

INVILNTEH'L MEM maxi M as 20., morouT UNITED STATES PATENT CFFIcE.

CHARLES E. HARTHAN, OE LYNN, MASSACHUSETTS, ASSIGNOR TO THE GENERAL ELECTRIC COMPANY, OF NEXV YORK.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent N 0. 635,851 dated October 31, 1899.

Application filed A ri123, 1898. Serial No. 678,549. (No model.)

arc Will be positively established and auto-' matically regulated during the operation of thelamp, and comprises certain combinations of parts, all of which will hereinafter be particularly pointed out and distinctly claimed.

In the accompanying drawings, Figure l is a view in elevation of the arc-governing mechanism. Fig. 2 is a side view taken at right angles to that in Fig. 1. Fig. 3 is adiagram illustrating the circuits of the lamp.

The carbon-regulating mechanism is mounted on a frame A, having at its bottom the centrally-located raised base portion B, with the tubular passage-way b. At the top of the frame A is a corresponding tubular passageway a. The carbon feed through the passage-ways a and Z). Suspended from the top of the frame A are the serieswhich the cores are mounted. Depending I from the frame A and on the opposite sides of the carbon-feed red are lugs c. Pivoted to these lugs is a lever F, having an open central portion surrounding the carbon-feed rod, the pivotal connection being made at opposite 1 sides of the central opening.

A link G is pivoted at one end between ears f on one end of the lever F and at the other end between ears g, fixed to the upper side of the cross-barE between its ends. The crossbar D is similarly connected with the opposite end of the leverF by link H. The upper end of the link H is pivoted within a slot in the rod 0 extends The series magnets ency, a dash-pot N is operatively connected end of the lever F, while its lower end is pivoted to cars h on the cross-bar D.

A lever K, having a bifurcated end 7t, is pivoted to the clutch-supporting sleeve L. The other end of the lever K is connected by a link M to depending lugs i on the frame A. The levers F and K are provided with elongated slots and are connected by a link I, hav ing its ends pivoted in the slots. The link H, above referred to, passes freely through the slot within which the lower end of the link I is pivoted.

In order that the series magnets D shall always be in condition to strike the are when the lamp is not energized, itis necessary that the core of the magnet be withdrawn when no current is passing. In the construction shown this objectis effected by the downward pull on the link I due to the weights supported thereby. To equalize the pullexerted by the magnets D on its core D, a compensating spring S is adjustably connected at s to the base of the frame A and at the other end is connected to an arm H, projecting from the link H.

Since the series and shunt magnets act in opposition to each other in moving the carhon-feeding rod, any substantial variation in the current through or difference of potential of the arc has a tendency to cause a reciprocation of the feeding-rod, known as pumping, the same being due to the inertia of the reciprocating parts. To overcome this tendto the feeding mechanism, which dash-pot has its cylinder pivoted to an arm G, extending from the link G. The plunger of the dashpot is fixed to the base of the frame A at '12..

The clutch mechanism consists of a hollow cylinder or sleeve L, having an inturned upper edge loosely surrounding the carbon-feeding rod. The inturned edge is indicated in Fig. l by dotted lines. Extending from opposite sides of the cylinder L are ears 0 with drooping ends. Each of these ears has a pivot 12, which engages a slot in one end of a bellcranklever P, which lever is extended around so as to clear the feeding-rod C and is fulcrumed at 0 in an open frame Q. The frame Q, has an oblong opening therein surrounding the carbon rod and the grip-shoes J and at either end a lug It, slidably engaging the reduced upper portion T of posts U, fixed to the base of, the frame A. The other arms V of the bell-crank levers are pivoted to gripshoes J.

On the under side of the cross-bar D is an insulated contact-block X for closing the circuit between the terminals Y and Z. The circuit is closed only when the core of the magnet D is in its lowest position.

A diagram of the circuits of the lamp is shown in Fig. 3. The current entering at :1: passes through the steadying resistance as and then during the normal operation of the lamp through the series coil D. The current then divides, the major portion passing through the are and thence to the negative terminal 1 of the lamp, while the other component of the current passes through the coil E in shunt to the arc and then to the negative terminal. A resistance y is connected in a normallyopen shunt-circuit about the coils D and E.

A device for short-eircuiting any number of spires of the coiled resistance 0; for purposes of adjustment is conventionally represented at The operation of the lamp is as follows: Upon closing the switch S the current passes through the series coil D, which attracts its core d. The motion of the core is then transmitted through the links H and I to the lever K, which then acts to lift the cylinder L. The pivot-pins 19, carried by the cylinder L, then act on the bell-crank levers P to turn them about their fulcruins 0', thus causing the grip-shoes J to bite the feeding-rod C. A further upward movement of the sleeve L raises the feeding-rod and so springs the are, the difference of potential of which results in energizing the shunt-coils E. These coils attracting their cores 6 act through the link G and lever F in opposition to any upward movement of the feeding-rod. The force of attraction of the coils E increases with the length of the are, and the mechanism is so proportioned and adjusted as to reach a condition of balance when the desired length of are has been attained. Upon opening the switch S the are is extinguished, the armature D of the series magnet falls, and the insulated contact-point X bridges the contacts I Z, thus shunting the resistance y about the actuating-coils E and D.

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

1. In an electric-are lamp, a frame, two sets of magnets pendent therefrom, movable cores for said magnets, a lever fulcrumed to the frame and connected by links with said cores, a second lever in operative relation to the first lever, a link for connecting one end of the second lever with the frame, a clutch carried by said last-mentioned lever, and a feeding-rod actuated by said clutch.

2. In an electric-arc lamp the combination of a rod, a sleeve loosely surrounding such rod, ears extending from said sleeve, verti- Cally-extending guide-rods with reduced upper ends, an open frame slidably mounted on said guide-rods, bell-crank levers fulcrumed in said frame, a grip-shoe carried by one arm of each bell-crank lever, and a sliding connection between the other arm of each bellcrank lever and one of said ears.

8. In an electric-arc lamp, the combination of a frame, guide-rods extending upwardly therefrom, a frame-piece movable on said guide-rods, a sleeve, bell-crank levers pivoted to said frame-piece and having one set of arms pivoted to said sleeve, and grip-shoes carried by the-other arms.

4. In an electric-arc lamp, the combination of a frame, a forked lever having a link connection with said frame, a sleeve carried by said forked lever, ears extending from said sleeve, a frame-piece, bell-crank levers fulcrumed in said frame-piece, a grip-shoe carried by one arm of each bell-crank lever, and a connection between the other arm of each bell-crank lever and one of said ears, and means for actuating said forked lever.

5. In an electric-arc lamp the combination of a sleeve pivotally connected to a floating lever, ears extending therefrom, bell-crank levers having a loose connection with said ears and fulcrumed in a frame-piece, and grip-shoes carried by said levers.

6. In an eleetric-arclamp, the combination of a frame, two sets of magnets fixed thereto, movable cores for said magnets, a lever fulcrumed to the frame and connected by links with said cores, a second lover, a link, for connecting one end of the second lever with the frame, a link connecting said levers, a carbon-feeding rod, a sleeve loosely surrounding said rod, and a pivotal connection between the sleeve and saidsecond lever.

7. In an electric-arclamp,the combination of aframe, two sets of magnets pendent therefrom, movable cores for said magnets, a lever fulcrumed to the frame and connected by links with said cores, arms extending from each link, a dash-pot connected to one arm and a spring acting on the other.

In witness whereof I have hereunto set my hand this 20th day of April, 1898.

CHARLES E. IIARTIIAN.

\Vitnesses:

H. P. Cnosnv, D'UGALD MoKInLor.

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