US768847A - Electric lamp. - Google Patents

Description

PATENTED AUG. 30, 1904. E. L. ELLIOTT.

ELECTRIC LAMP.

APPLICATION FILED JUNE 5, 1903- NO MODEL.

UNITED STATES,

Patented August 30, 1904.

PATENT ()rrrce.

ELIAS L. ELLIOTT, OF NEIV YORK, N. Y., ASSIGNOR TO ILLUMINATING ENGINEERING COMPANY, OF NEW YORK, N. Y.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 768,847, dated August 30, 1904,

Application filed. June 5, 1903. Serial No. 160,218. (No model.)

To all w/wnt it 777/6117] concern:

Be it known that I, ELIAS L. ELLrTT,a citizen of the United States. residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electric Lamps, of which the following is a specification.

This invention relates toineandescent electric lamps.

The object of the invention is to improve the mechanism of a lamp having a plurality of filaments or circuits, so that a large or small light may be shown or both may be extinguished; and the invention consists in certain constructions and combinations of elements, substantially as hereinafter set forth and claimed.

Figure 1 is a broken side elevation, partly in section, showing a lamp according to the present invention. .Fig. 2 is a cross-section of same on line 2 2, Fig. 1. Fig. 3 is an enlarged detail cross-section of ring and rotating mechanism. Fig. A is a perspective View of perforated ring.

The numeral 1 indicates a lamp-socket of usual construction. A metallic shell or adapter 2 is screwed into this socket. The porcelain or similar base 3 of the lamp screws into this adapter when the parts are connected. The adapteris insulated from the cap 4. Cap 4 has contact-pieces 5 5, which make contact with the cap 6 of the lamp in usual manner. The adapter is in circuit with the return or ground current. A wire 7 leads from the cap 6 to one end of each of two filaments 8 9. The outer ends of these filaments are connected to two contact-pieces 10 and 11 (extending at around the neck of the lamp will bring an arm 13 into contact with one of the contactpiecessay l0thus closing circuit through the filament 9 and illuminating the lamp by means of the large filament. A further turn of the ring breaks this circuit, but brings another arm 13 into contact with piece 11, thus closing circuit through the short filament and lighting the lowpower lamp, while extinguishing the larger one. A still further turn breaks both circuits, putting both filaments out, and a further movement repeats the sequence-that is, a bright light, a small light, and no light.

The ring 12 is to be rotated constantly in one direction, and as a convenient means for causing such rotation I will describe the mechanism illustrated more clearly in Figs. 3 and 4.. The ring 12 has holes or ratehets, which holes are in number multiples of three. A pawl 21 is mountedon wire 22, which partly encircles the adapter, and is drawn back by a spring 23, connected to the adapter. The inner end of pawl 21 passes through a slot 2 1 in the adapter in position to enter one of the holes in ring 12. A pull on the outer end of pawl 21 in the direction of the arrows, Figs. 2 and 3, will draw the nose of the pawl into one of the holes 20 in ring 12 and if continued will move the ring 12 rotatively about the stem of the lamp until the pawl reaches the end of slot 24:, which will stop the pawl and the rotation of the ring 12. This movement of ring 12 will have changed the position of arms 13, carrying one out of engagement with contact-piece 10 and another into engagement with contact-piece 11 or carrying all arms 13 out of engagement, as the case may be. Pawl 21 is pulled by acord 25, and when this cord is released the pawl will be drawn back by spring 23 into position where it may enter the next hole or ratchet 20 in the ring. Thus repeated pulls on the cord 25 will shunt the circuits to light one filament, then extinguish that and light the other, and then extinguish both. A casing or covering 26 extends Over the pawl and spring to protect the ratchet-and-pawl mechanism. The pawl 21 extends through a slot 27 in this casing, and a loop 28, connected to the casing, may serve as a guide to cord 25.

When the lamp is screwed into the adapter, it must come to a defined stopping-place, so that the circuits bear the proper relation to each other. This may be effected by the abutment of the caps 4 and 6 or in any other suitable way to secure proper adjustment.

Lamps are known which can be turned high or low by a rotative movement of the lamp. This necessitates taking hold of the lamp, which is objectionable. Other lamps are known in which a swinging switch may be operated in one direction by one cord and in another direction by another cord, which is liable to lead. to mistakes. My arrangement of repeated pulls in one direction to produce the desired sequence of events is considered advantageous. WVhat 1 claim is 1. The combination with a lamp having a non-conducting base provided with electrical contact-pieces, of a ring surrounding said base and having contact-arms, and a pawl-andratchet mechanism for rotating said ring by a series of impulses.

The combination with a lamp-base having contact-pieces, a metallic ring surrounding the same and having engaging contactarms, a ratchet-and-pawl mechanism for moving said ring, and a casing covering said rotative mechanism.

3. The combination of a threaded lampsocket, threaded adapter entering the same, lamp-base having contact projections at its sides, a ring surrounding the lamp-base and having contact-arms, a ratchet-and-pawl mechanism for rotating said ring, and a casing covering said pawl mechanism.

In testimony whereof I afiix my signature in presence of two witnesses.

ELIAS L. ELLIOT T.

\Vitnesses:

BURT T. BAKER, JAMES L. BAKER.

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