US999340A - Arc-lamp. - Google Patents

Description

0. A. ROSS.

ABO LAMP.

LPPLIOATIOI rnnn In 20,1902.

999340. 1116111111 Aug. 1, 1911.

UNITED STATES PATENT OFFICE.

OSCAR A. BOSS, OFCHIGAGO, ILLINOIS, ASSIGNOR, 'BY MESNE ASSIGNMENT S, T ALBERT H. HEADS, OF CHICAGO, ILLINOIS.

ARC-LAMP.

Specification of Letters Patent.

999,340. Patented Aug. 1, 1911.

Application filed Kay 29, 1902. Serial No. 109,450.

To all whom it-moy concern: coil R by wire 7'. The other end of the coil,

Be it known that I, OSCAR A. Boss, a cititogether with one terminal of solenoid-S, is zen of the United States, residing at Chiwired to the negative lamp terminal N. cago, in the county of Cook and State of -The ne ative electrode B is connected with Illinois, .have invented'certain new and usesolenoi S by wire 6. The operating parts ful Improvements in Arc-Lamps, of which are shown in theosition they would assume the following is a full, clear, and exact .de: at th instant be ore the arc is full drawn. scri tion. The guides G are insulated from t e frame T is invention relates to electric'lamps of of the lamp and are secured at'the bottom to 10 the arc type, and especially to that class opan insulated support E, and at the top to erated from a constant potential generator. yoke Y, also insu ated. -No feeding mecha- The object of the invention isto provide a nism. is necessary for the negative electrode new and improved lam of this description.- in this type of lamppreferabl 'an inclosed My invention is fullyillustrated in the arc. The frame, supports, inc osing globe,. .15 accompanying drawing, wherein: -etc., are of ordinary construction andneed Figure 1 represents a part sectional front not be here described. v elevation of the operative 'parts of my iiril The operation is as follows: When current proved lamp; Fig. 2 a side view of the is admitted to the lamp, the electrodes besame; F ig. 3 is a sectional view taken on ing in contact, it passes bywire to holder 20 line w:c of Fig. 1, and Fig. 4 is a plan view H,- thence' throu' h --both electro es and by of the carbon holder. j wire I; to solenoi S and to the negative ter- Like letters refer to like parts in each. minal' N. The armature a is thus drawn up, A represents the positive carbon or eleclifting one end ofclutch G at 8?. The weight trode, partly broken away to show the operof the clutch holds the other, or free end, 25 ative mechanism. down, tilting the clutch until the positive B is the negative electrode. carbon is -gr1 ped by the walls surrounding S is a solenoid of ordinary type, provided openin c. l he electrode and clutch are with armature s, and connecting link 8', by then l i ed by the upward pull of :armature means of which latter the movements of the a'until the lugs 0' strike the upper ends of armature are transmitted to the clutch C, slots g. =The upward'moveme'nt beingthus through the pin a. The clutch has .a circuchecked,-the forcestill exerted by solenoid S. lar opening 0, through which the positive tendsto further tilt the clutch on lugs c, carbon feeds. The lugs c, on the sides of whichhatthat point constitute the pivotal the clutch C, work in slots g, milled in the center of the clutch. The positive-electrode 85 carbon guide rods G. The link '8' is prois thus firmly held by a force exerted vided with a curved lug .9 which, by strikequally on its oppositesids. In the positlon ing upon the upper face of the clutch serves described, an abnormal-increase of current to prevent it from falling below a horizon 'in solenoid S simpl results in ippingelec tal position when released by solenoid S, trodeA-more fir y without lfti-ng 1t fur- 40 and pins 0' are at the bottom of slots 9'. .ther and rupture of the are by excessive en- The holder H for the positive carbon is comergization of the solenoid is in this manner posed of two halves h, It held together by a prevented; and the electrode will be mainspring 71., the ends of which entga e pins h tained in this ition until the current secured in the two members 0 t e carbon strength has so iminished that the weight 45 holder. This-carbon holder slides in guide of the various parts serves to overcome the rods G. Its beveled edge It is shaped to fit tractive force of the solenoid. In practice seat j of contact piece J, and prevent this condition does not occur, except when further downwa rd movement of the positive there is a practical cessation of current. electrode A, when it has been nearly conthis weight is comparatively small, it is ev1-- 50 sumed. The lamp terminals are represented dent that a very considerable diminutlon of 1 at P and N by the usual signs and A line current may be felt before the clutch 'flexible cord p, connects the positive termireleases the positive electrode. When the. r al with carbon holder H, enabling the caradjacent ends of the electrodes have been hon to feed without hindrance. Contact sujiiciently consumed to cause the arc to 55 piece J is connected to one end of resistance break, the interruption. of the circuit theretofore maintained between the lamp terminals demagnetizes solenoid S, allowing its armature, the clutch and the positive electrode to fall until contact is restored between the electrodes, when the arc will again be established in the manner before described. This intermittent feeding of the lamp will continue at long intervals until the positive electrode is consumed to the point where the face h of holder H impinges upon seat j of the contact piece J. The downward movement of said electrode being thus checked, the circuit will be broken between the electrodes and the current shunted from contact J through'wire j and resistance R to the negative terminal N. As this resistance is practicallyequal in ohmic value to that of the established arc K, the equilibrium of the circuit is preserved and the other lamps thereon operate as usual. Whenever the clutch is released by solenoid S, should its free end fail to fall as rapidly as the opposite one, for any cause, the lug s will strike the upper surface of the clutch, forcing the free end down and causing the clutch to assume a practically horizontal position from which the next upward stroke of the solenoid will cause the clutch to promptly grip and raise the carbon in the manner heretofore described. My present invention prevents the rupturing and restoring of the arc while the lamp is operating.

Generally speaking, my invention comprehends a form of clutch calculated to strike an arc of a given length and to preserve the are by locking the positive carbon firmly at that point, so that it may be maintained irrespective of currentvariations or jarring and shaking of the lamp with occasional feeding, until the electrodes are nearly consumed, when the operating parts are shortcircuited in a simple and novel manner, a resistance being automatically introduced at that time, to retain a constant current in the circuit. The means of retaining the electrodes in the same vertical line is also a feature of my invention.

Carbon electrodes commonly used in arc lamps frequently vary slightly from their stated diameter. As the length of the arc eeaaao 'vention and is an important improvement on the mechanism of arc lamps with which I am, familiar.

. Having described my invention, I claim 1 An arc lamp comprising parallel rods, an electrode associated therewith, a holder for said electrode formed of two parts, a

device within said parts adaptedto hold them together.

2. An arc lamp comprising an electromagnet, two electrodes, a ring clutch, a support therefor, a trunnion connection between said clutch and support in the plane of the upper electrode, a movable part controlled by the electromagnet, a pivotal connection between said part and one end of the clutch, and a stop device on said movable part for engaging the end of the clutch under predetermined conditions.

3. An arc lamp comprising an electrode,

two parallel rods by which it is guided, a

clutch pivotally connected atone end to said parallel rods in-the plane of said electrode, and an electromagnetic device associated with the other end of said clutch so as to vary its position. v

4:. An ELIC lamp comprising an electrode, two' substantially parallel rods between which said electrode is located, a clutchprovided with projections which enter elongated slots in said rods, and an electromagnet' connected with said clutch.

lln witness whereof, ltsubscnbe myslgnature, in presence of two witnesses.

OSCAR A. ROSS.

Witnesses:

VVM. H. CLARKE, WALTER PoULsoN.

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