US398906A - Arc lamp - Google Patents

Description

(No Model.)

' Wl L. SILVEY.

ARC LAMP.

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L17/metan UNITED STATES PATENT wlLLlAM L. SILYEY, OF LIMA, OHIO.

ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 398,906, dated March 5, 1889.

Application filed February 2l, 1888.

l l l Hy invention relates to polyphotal arc lamps in which the positive carbon is always fed downward, the arc being formed by the i the escapement-bar C down.

carbon points, first, by coming together by the descent of the positive carbon until it touches the negative carbon, at which time the negative carbon is drawn down bythe acbeneath it andin the main circuit of thelamp.

This lamp is intended for Inultiple-arc circuits; hence no translating or cutoutdevices are required, to prevent interfering with other lamps. Each lamp is intended for an independent circuit; hence this device is entirely different from the series system of running arc lamps usually employed.

Referring to the accompanying drawings, which are made apart hereof, similar letters refer to similar parts.

Figure lis a side elevation of the entire lamp. Fig. 2 is a front elevation ofthe working mechanism. Fig. 3 is afront View of the escapement mechanism, and Fig. 4 is a rear view of the escapement-wheels and feed-rod in their proper position.

The lamp consists of t-he usual base, A, side rod, F F', and cross-bar on stand G, to which l attach my improved mechanism. To the top or planed side of the base-plate A, l secure the upright standard A and overhang'- ing arm A2. This'standard serves the purpose of a stay to the upper part of the square carbon-rod B and also the moving mechanism. About half-way up the standard is a boss, A3, which is drilled to receive the projecting stud b. This small spindle acts as a carrier on which the small gear-wheel B and escapeinent ratchet-wheel B2 and escapement-wheel B3 revolve, the three wheels being held in place by a small, nut, b2, on the outer end of stud b. Just in front and inclose proximity to the face of t-he esca-penient\\l1eel Bs is the vertically-arranged escapement-bar C. On the back side of this escapement-bar and near each end are two small wedge-shaped project- Serial No. 264,868. (I\l`o1noilel.

ing lugs c c". The lower end ot' this escapement-bar passes through a hole in the base A, and the upper part is threaded and passes through the standard A. his threaded stem carries a thumb-nut, e', which used to give more or less tension to the conical compression-spring c2. .By screwing down this 11u-t more tension is imparted to the spring, and consequently it will take more power to draw On the outer face of the escapement-bar C an armature,C ,is fastened immediately above the polar extension D of the electro-magnet D. J ust above 3 this armature C is a projecting flat spring, tion of an electro-magnet placed immediately i' c3, screwed to the face of the eseapement-bar C, the free end of the spring coming in contact with the regulating contact-screw c4, the screw being insulated from the overhang-ing arm A2 by a bushing through which it passes. The small pinion B and ratchet-wheel B'2 are screwed together, the escapement-wheel pressing up against them, the pawl E serving to allow the rod B to be pushed up for trimming, but preventing it from descending only by the action of the escapcmcnt. The action ol the feeding is as follows, it being remembered that this lamp works in derived circuit or a current of constant potential.

lt will be observed that the electro-magnet D is of high resistance, its circuit being derived oraround the arc, so that as soon as any current is supplied to the lamp this magnet will come into action. The current to this high-resistance circuit enters at the negative insulated binding-post- N, thence to the coils of the electronnagnet D, thence to insulated contact-screw c, from which it escapes by contact-spring c3 and escapcment-bar C to the frame-work ot' thc lamp and escapes by noninsulated positive binding-post P to the external circuit. The current being turned on, the electro-magnet will immediately attract the armature C and draw the cscapementbar down, causing the contact-spring c:3 to break the derived circuit, in which the inagnet is included. As soon as the circuit is broken the magnet loses its power and the retracting-spring c? immediately draws the bar back to its original position, closing the circuit, and the operation repeated. The escapement-wheel has an uneven number of teeth, as 125, and the two small wedgc-shaped IOO lugs c c5 being placed opposite, it is evident that while one is drawn down int-o the wheel the other will be directly over the point of the tooth on the opposite side. Thus the bottom one beginning to draw out from between the teeth, the rod B will be sufiiciently heavy to turn the wheel, and before this tooth is Yfree the point on the opposite side begins to enter the next tooth, so that it is impossible for the lamp to feed more than the distance between two teeth ata time. The up-and-down motion being caused by the make and break of the circuit in which the magnet-coil is included at the point of cont-act between the spring c3 and contact-screw C, at each make and break of the circuit the rod is allowed. to descend the Vdistance zot lone tooth, which amounts to about one two-hundredth part of an inch. In this way I maintain a perfectly steady light in the main or arc circuit. In the operation of the lamp, there being no means for separating the carbon points after they have come together inn order to establish the are, -it'bein gremenibered -`th at Vthe posi tive carbon-rod has but one movement, that being downwarchnow, therefore, yin 'order -that'the are be established, wemust use 'the negative side `oi the lamp to makethe separation. To the lower side ot' the cross-bar G, I fasten an Vordinaryelectro-magriet, G', whose coils are inthe main or arc circuit. The current on the negativ-e side of the lamp enters at binding-post N, thence bynegativ-e conductor ynto the fcoils ofthe electro-magnet G', rom'which it escapes by short wire yn to cross-bar G, (the cross-bar being` insulated fronithe rest-of the lamp above,) thence to negative carbon d and negative carbon F.y The negative carbon is supported (when not in use) by a flat spring,

co2, the spring being held firmly against the negative carbon-holder by an iron armature, d3. This armature is attracted by the electro-magnet as soon as the current is turned on. This attraction causes the armature to draw down against the end of the magnetcore G2, to which it adheres as long as the current iiows in the circuit. The drawing down of the negative carbon-holder forms an are between the carbon points, which is maintained as long as any current flows.

Having fully described the mai'n working' features of my improved lamp, what I claim to have invented, and wish to secure by Letters'Patent ot' the United States, is-

(In an arclamp, the combination of the baseplate A, bracket A', and overhanging arm A2, Square rodrB, having a rack cutin one side of it, pinion B', ratchet-wheel .Band escapement B3, all mounted on the common center, b', theirm'otions being controlled by vertical escapement-bar C,l1aving on one side twees- .capement-'points, c c', engaging at diametri@- ally-fopposite points of the-escapement-wheel, all bein goperated byy electro-magri etD, armature B3, spring L?, contact-screwc4, and vibrating circuit-breaker C3, as set forth and described.

IVILLIAM L. SILVEY.

lVitnesSes:

F. P. GRAF, C. F. KELLER,

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