US955748A - Sectional incandescent lamp. - Google Patents

Description

G. E. BILL & A. D REDMAN, Sn.

SEGTIONAL INGANDESGENT LAMP. APPLIOATION FILED SEPT. 24, 1908.

Patented Apr. 19, 1910.

with 200% lUNITED STATES PA ENT onn o'n.

\ ononen EDWIN BILL AND/,ALBEERT nnwnnzn Barman, SR, or naanrsnune,

PENNSYLVANIA. I 1

SECTIONAL moannnsonnr LAMP.

Specification othe tters Patent. 1 Patented Apr, 19, 1910.

Atplimtion filed September 24, 1908. Serial No. 454,498.

To whom it may concern: Be it known that we, Gnome EDWIN BiLL and ALBERT Dnwnnzn REDMAN, Sn, citizens of the United States, residing at Harrisbur in the county of Dauphin, State of Pennsylvania, have invented a new and usefuPSectional Incandescent Lamp, of which the following is a specification.

This invention relates to sectional incandescent lamps. l

The object of the invention is generally to nnprove the lamp on which Letters-Patent No. 860,627 were granted to us July 23, 1907 and particularly the means for successively cutting the filaments into circuit, one

' at a time, in either order, to the exclusion of there being a ioridge wire extend' the other. filaments.

. Further objects and advantages will ap pear 1n the following description, it being understood that various changes 1n form, proportions'and minor details of construe tlon may be resorted to within the scope of the appended claims.

l'n'the accompanying drawingsformi'ng a part of this specification: Figure l-is a slde elevation partly in section of an incandescent lamp provided with a socket controller or regulator constructed ill 51000113111162 with our invention.

across the top of the matrix and disposed incontact therewith, as shown.

Arranged within the bulb 5 area plurality of filaments 9 formed of carbon or other suitable material and each connected by a platinum lead wire 9' with a conductor 10,

verselyacross .the upper ends of t e filaments and provided with a series of loo each of which is" connected with one of tii:

I Fig- 2 is a transverse sec-* tional view taken on the line 2--2 of Fig. 1.

.of reference indicate I said gear.

transstrands of each filamentr These conductors with the plate 8, the ends of the con uctors 10 being extended into the eyelets andsoldered or otherwise secured to the interior walls thereof.

Disposed in spaced relation to the plate 8 is a mating ca 13 having a se mental slot or groove. 15 w ich is engaged y a radial projection 14 on the cap 6, whereby said caps are locked against accidental separation. r

The cap -l3 is formed with terminal threads 16 adapted to engage the correspondin threads 17 of an ordinary incan descent amp socket, indicated at 18, so that the device may be conveniently connected in a lighting circuit, one terminal of the circuit being connected to the cap 13 and the opposite terminal thereof'to a metallic rod or pin 19 carried by said cap.

The lower end of the pin 19 terminates short of the plate 8 andis provided with a threaded socket20 for engagement with a correspondingly threaded pin or screw 21, there being a worm wheel or gear 22 interposed between the base of thepin 19 and the head 23 of/the screw, as shown.

' The gear 22 is free to revolve on the screw the base of the pin 19 and the head 23 being devoid of threads/to Secured to and mounted for rotation with the gear 22 is a contact member 24 preferably formed of a single strip of spring metal, one end of which is fastened to the gear, while the opposite end thereof 15 bent 21, that portion of the screw between permit free rotation'of upon itself and thence extended laterally to form a spring tongue 25 terminating in an upwardly curved lip 26;

That portion of the sprlng tongue 25 adjacentthe lip 26 is provided with a depression defining a projection 27 arranged to enter the sockets of the contacts or eyelets 11, thereby to temporarlly lock the spring tongue in engagement with said contacts.

Journaled in insulated bearings 27 in the walls of the caps 6 and 18 is a transverse rod 28 having its intermediate portion provided with a worm gear 29 adapted to mesh with-the gear 22, there being a finger piece cuit the candle power of the lamy may be varied at will.

.Vhen it is desired to vary the intensity of the light the rod 28 is rotated by turning the finger piece 30 thus causing the worm 29 to engage the teeth of the gear 22 and rotate the contact member 24:.

As the spring tongue of the contact member travels over the upper surface of the plate 8, the projection 27 of said tongue will enter the socket of the adjacent eyelet or contact 11, thusclosing the circuit through the first filament of the series or bank and causing the same to become incandescent.

When the contact 24: is in the position shown in Fig. 1 of the drawings the current will flow through the contact 24 to the adjacentstationary contact or eyelet and thence through the loop or filament connected with said stationary contact and off to the line through the cap 6. When the movable contact 24 is again rotated the spring tongue of said contact will engage the next succeeding stationary contact, in which event the current will fiow through the second loop or filament and thence through the bridge wire or common return 31 to the cap 6 and then off to the line. It will thus be seen that the several filaments may be successively cut into circuit, one at a time,in either order, to the exclusion of the other filaments, each filament having a different candle power and therefore permitting variation in the intensity of the light.

Attention is here called to the fact that the lug or projection 27 on the spring tongue of the movable contact will enter the sockets of the stationary contacts as the tongue'successively registers therewith so as to temporarilylock the movable contact in circuit closing position, it of course being understood that the projection is held in engagement with the sockets only by the spring action of the tongue so that a relatively quick turning movement exerted on the finger piecet3O will disengage the projection 27 from the socket of the adjacent stationary contact and thus permit the movable contact 24: to be positioned over'the next succeeding stationary cpntact when a furpin 19 and movable ,ther rotary movement is imparted to said finger piece. The resiliency of the movable contact will cause it to engage the stationary contact with a light, sharp, clicking sound, so that should there be a defectivev connection to one of the conducting wires, the engagement of the movable and stationary contacts will be announced by the usual clicking sound, but will not be followed by the flashing of the corresponding filament. The presence of a defect will thus be made known, when it would not be discovered if g the only notice given of the engagement of the contact was the lighting up of the filament. It will also be noted that the bridge Wire or common return 31 is formed of a plurality of loops each of which is connected with one of the strands of each filament so that when one filament of the'bank is cut into circuitthe remaining filaments of the series or-bank will be cut out, the current following thepath of the least resistance and passing through the bridge wire or common return to the cap 6 and. thence oil to the line in the manner before stated.

The lamps may be made in different sizes and shapes and provided with any number of filaments. It will also be understood that the filaments and lead wires may be formed 'of carbon, platinum or other suitable material without departing from the spirit of the invention.

Having thus described the invention what is claimed is 1. In an incandescent lamp having a plurality of filaments, the'combination of a plate extending horizontally across the lamp above the filaments, stationary tubular contacts piercing the said plate, connecting wires leading from the filaments and having their ends secured within the bores of the tubular contacts, a conducting pin' within the upper portion of the lamp, a resilient contact mounted on the lower end of the and provided with an enlargedhead, said screw havin an intermediate ortion thereof devoid 0 threads, a gear w eel mounted for rotation on the unthreaded portion of the screw, and a movable contact carried by the gear to engage the stationary contact.

, 3. In .a lamp of the character set forth, the combination of a pluralitypf stationary tubular contacts, an operating shaft disposed horizontally above said contacts, a as our own, we have hereto aflixed our'siggear driven by said shaft, and a contact natures m the presence of two witnesses. member having one end secured to said I gear, extending radially therefrom and gggig g fi s 7 then bent back on itself to present a free B R spring arm having a projection on its under Witnesses:

- side to enter one of the tubularcontaots. C. H. BACK-ENSTOE,

In testimony that we claim the foregoing ED IN M. HERSEEY.

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