US931168A - Arc-lamp. - Google Patents

Description

VBM

S. P. WILBUR.

ARC LAMP.

APPLICATION FILED APILZB, 1906.

931,168. Patented Aug. 17, 1909.

T Y J INZENTOR.

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W1 TNESSES "hurrah SAMUEL P. WILBUR, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A. CORPORATION OF PENNSYLVANIA.

ARC-LAMP.

To all whom it may concern:

Be it known that I, SAMUEL P. VVILBUR, a citizen of the United States, and a resident of VVilkinsburg in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Arc-Lamps, of which the following is a specification.

My invention relates to arc lamps and it has for its object to provide a cut-out and feed regulating device therefor which shall enable operation of the lamp upon either a direct or an alternating current circuit, and which shall insure feeding of the electrodes upon the occurrence of a constant predetermined voltage at the arc, regardless of the variations in the amount of current that traverses the circuits of the lamp.

The single figure of the accompanying drawing is a diagrammatic view of the structure and circuits of an arc lamp that embodies my invention.

A pair of electrodes 1 and 2, that are normally in engagement, are adapted to be separated by means of a magnet having a winding 3 connected in series with the electrodes between binding posts 4 and 5 of the lamp. Connected directly between the binding posts 4 and 5 is a comparatively high resistance magnet winding 6 that is mounted upon a projection 7 from a laminated magnetizable core 8, the remainder of which is of substan tially E-shape. A. movable armature 9 for the magnetizable core 8 carries a terminal piece 10 that is adapted to be brought into engagement with a stationary terminal piece 11 when the armature 9 is attracted by the core 8, for the purpose of establishing a circuit through a resistance 12 and a magnet winding 13 placed upon the middle of the E-shaped portion 01": the magnet core 8. The high resistance magnet winding 6 becomes sutliciently energized to cause the core 8 to attract the armature 9 when the voltage between the electrodes rises to a predetermined value, and the magnet winding 13 serves to retain the switch in closed position until the electrodes 1 and 2 are again brought into engagement.

When current is first supplied to the lamp, the magnet winding 3 becomes energized and causes separation of the electrodes 1 Specification of Letters Patent.

Application filed. April 28, 1906.

Patented Aug. 17, 1909.

Serial No. 314,206.

and 2, an are being thereby established be tween them. When the voltage between the electrodes exceeds a predetermined limit the magnet winding 6 becomes sufficiently energized to cause the armature 9 to be raised to etlect engagement of the contact terminals 10 and 11. The contact terminals 10 and 11 will be maintained in engagement by the magnet winding 13 until the electrode 1 drops into engagement with electrode 2, whereupon a comparatively low resistance circuit will be established through the magnet winding 3 and the electrodes 1 and 2, when the armature 9 will be released, on account of the reduced magnetizing effects of the Windings 6 and 13. Separation of electrodes will then be eilected in the usual manner by the magnet winding 3. If, for any reason, the electrodes are not brought into engagement, the magnet winding 13 will remain energized and the lamp will be removed from service without interrupting the circuit from which it is supplied. The magnetizable core 3 is laminated and shaped in the manner shown, in order that, when the lamp is supplied with alternating current, heating of the core will not take place and no transformer action will occur between the windings 13 and 6 while the switch contacts 10 and 11 are in engagement because little or none of the flux produced by each of the windings 6 and 13 surrounds the other. Obviously, the lamp may also be supplied from a direct current circuit. The voltage at which the magnet winding 6 becomes sutficiently energized to cause feeding of the upper electrode may be regulated within considerable limits by adjusting the weight of the armature 9, by means of suitable counter-weights 14k, or otherwise so' that changing of the windings for this purpose will be unnecessary in many cases.

I claim as my invention:

1. In an arc lamp, a cut-off device comprising a magnetizable core of substantially E-shape but provided with an auxiliary projecting portion on the side opposite to the three main projections, a magnet winding connected in shunt to the arc and mounted upon the auxiliary projecting portion of the core, a magnet winding mounted upon the central inain projection of the core, and a arated, and a inagnetizable core upon which 10 switch for controlling the circuit thereof t the said magnet windings are mounted in that is actuated by an armature for the core. r non-inductive relation to each other.

2. In an arc lamp, a cut-out switch for In testimony whereofllhave hereunto subestablishing a circuit in shunt to the are, an i scribed my name this 21st day of April, 1900. operating magnet winding therefor permal Si-MWHTEL P. WWJBUR. nently connected in shunt to the arc, a mag- I Witnesses: net winding for maintaining the switch in BURT Bar, closed position when the electrodes are sep- BIRNEY HINEs.

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