USRE11002E - Electric-arc lamp - Google Patents

Description

' I 2 Sheets-Sheet 2.

G. B. NOBLE. ELEGTRIG ARC LAMP.

- Reissued May 7 WM lllllll allllllll g Iiiiim Smveh-loz I 3513 attozmm I I i .35 I p Referringto the drawings by'letter', Zisthe' UN TED ST TE PATENT- OFFICE.

CLARENCE B. NOBLE, or C EVELAND, 01110.

ELECTRIO-ARQ'LAIVIP.

SPECIFICATION forming part of Letters Patent No. 11,002, lay 7, 1889. Original Io- 874,129, dated November 29, 1887. Auplioation for relllne illed February 15,1889- lsrial Io. 800,078,

To all whom it may concern:-

Be'it known that I, CLARENCE B. NOBLE, a

resident of Cleveland, in the county of Guyahoga and- State of Ohio, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do. hereby declare the following to be a full,- clear, and exact description of the invention,'such as will enable others skilled in the-art to which it appertains to make and use the same. V r

The invention consists in providing improved means tor automatically throwing the.

current from one set of carbons to another when the former has been nearly or quite con- In the accom anying drawings, which illus-.

trate my invcn on, Figural is a perspective view of the mechanism atamy improved lamp,

two sides of the casing lfing removed. Figs. 2 and 3 are respectively side and front elevations of the mechanism. Fig.4 is a horizontal section; and Figs. 5, 6,7, and 8 show details In this application two'diflerent forms of clutch are shown and described. Figs. 1, 5, and 6 show one of them, and Figs. 2, 8, and 4 the other. The clutches are upon to feed; the red by substantially the same mechanism in both instances, and the present invention has'reference more particularly tothis mech- 'frame of my lamp, and wand m aretwo sets of carbons, forming part thereof.

A and B represent the usual line and coarse wire magnets, which act diflerentially on av common core, 0'. Pivo'ted to the core and to a standard, G, is a bar, L, to whioh between its pivots is attached a horizontal bar, K, ex-

tending at right angles beneath the said bar .L. The ends of the bar in the torm of lamp shown in-Fig. 1 are located beneath ringclntches d d'en the carbon rods T T. The

clutches are supported on the ends of hooked. links P P, which are suspended iromthe e2 tremities ot Ushaped formations on the ends of a lever, Iyyhich latter isp'ivoted to an onwhich supports the clutch dislower tl"1an the other, being under tension from a spring,-

' tension, E, of the standard .G; Theleverhis normally tilted, so that one end-say thatunder the clutch d, while the other end is'considerably below the clutch d. As a conse- (fiillence only the'rod T will be acted on when t 0 bar K is lifted to establish the arc. It .will be understood that the hooked link P supports the ring-clutch ina horizontal position, and that a tilting of the clutch to grasp "the carbon rod takes place when the bar strikes against the clutch.

In Figs. 2, 3, and 4 I show a difierent kind of a clutch, being identical with one for which I received .a patent numbered 346,217, and

dated July 27, 1886: In this construction the clutch d consists of a disk located within the hollow carbon rod, and en ported by two rods or wires, w and v. The w, in this instance, is connected loosely to the disk, and the rod 1: is bent at the lower end and hooks into a slot in the disk. The latter .is permanently attachedto a brass arm, S, which rests upon an insulating-block, R, on thebar K. The

wire w passes loosely through the said arms, which serves to prevent its moving to one side. The liftingof the rod or wire 0, due to the action of the lamp inestablishing. the arc,

tilts the disk and raises the positive carbon of the a: group. 7 The same action has-no eflect upon the other clutch, (which is constructed in the saniefmannen) because the disk is held up out o! the way of the moving rod,,as shown in Fig.3.; Thelever his connected with the movable core bjoi. magnet D. This magnet is wound with both fine and coarse wire, the

fine wire being inthe same shunt around the arc'with magnet B,'a'nd the coarsewire forming apart of themain circuit. The core I;

carries a projection, b',-which plays between two pairs of contacts, a a" and o and. a. The contact a is the termin'al of the coil on magnet D, and the others are pieces separately supported by an insulating-block,

s Referring to Fig. 3 ,the main circuit enters the lamp at +','and atterpassingarounii magnot A branches at A; one branch, 1, going-to ioo contact and the other 2, to the coarse coil of magnet D. WVhich course the current takes depends on the position of the strip 1) with and lowers the bar K, allowing the rod to feed. The course of the current is now as follows: From through magnet A, out at 'A' and along branch 1 to contact a", through strip b' to contact a, to upper carbon, to lower carbon, andto \Vhen the are is established, the movement of the bar K is not long enough to impinge against the ring d,

' and so rod T and the a: carbons only are separated. \Vhen, however, the carbons are nearly consumed, the resistance increases abnormally and the current in the shunt becomes stronger, until magnet D becomes sufliciently energized to lift its core and lift the strip 1) from contacts a and a". The full current then passes through the shunt-wire, drawing core I) up untilstrip b makes contact with 0 and a, When this contact is made, the main current then passes over branch wire 2, through coarse coil on magnet D, contact a to strip 1), contact 0. to carbons as, and thence to The heavy current now passing through magnet D holds the strip 11' against the contacts. The lifting of the core 11 also causes the tilting of lever h to a horizontal position, so that ring (1' is brought within the movement of bar K,- and, as h becomes horizontal at the same time core b is elevated, the ring d will be lowered upon the bar K and be tilted to grip the rod,

while the ring d will be lifted away from the bar K. The'parts are adjusted so that the point at which this rod is elevated by bar K will be the point at which the are is established. The w carbons will now be consumed and fed in the same manner that the a: carbons were. The main core 0' is slotted, and a block, J, is inserted into the slot and hung on a pin which passes laterally through the core and projects through the side thereof, where it has secured to it an arm, 6. The block J is also slotted to allow the pin 0 to slide within it, and it has an enlarged base, which extends out beyond the core to rest on the head of the magnet B, as will be set forth. The bar L is pivoted to this block. The arm e extends out and over the spring-armature F of a magnet, O, which is secured to any convenient part of the lamp frame. The armature is insulated, as shown, and has a piece of soft iron, e, secured toits lower face, and is further provided with contact m, which engages with contact n onjt-he head of the magnet C, the latter contact being one of the terminals of said magnet. The terminals are in a branch circuit around the lamp from to as shown in Figs. 2 and 3. Vhen the second set of carbons m are burned out, the resistance becomes excessive and the magnet B draws the core down until the block J rests on top of the spool. Then the core continues to settle and the pin 0" to move in the slot of J until arm 6 forces the spring F down so that contact is made between m and n. The

lamp is thus cut out or short-circuited, and so long as the current passes through magnet C the armature F will be held down. The magnet I) does not act to tilt the lever it until the resistance of the a: carbons becomes excessive; owing to the complete or nearly complete exhaustion of the said carbons, or of one ofthem. Under other conditions the spring Y counterbalances the pull of the said magnet. The core 0' may be supported on a' spring, which can be placed in the hollow core of the magnet B, so that when the carbons are normally feedingthe weight .of the said core will not cause the arm 6 to bear down upon the armature F to cut out the lamp-- that is, the weight of the core 0 is counterbalanced by a suitably-placed spring. During the consumption of the first set of carbons the carbons of the secondset arein contact, the upper carbon being supported by the lower, and thus the are establishing and feeding magnets are relieved of its weight. Similarly while the secondset is being consumed the unused stub of the upper carbon of the :r set is resting on the lower carbon. In each instance the clutch of the set not in use is raised out of the pathof the bar K. It is evident that the contacts a and a" may be dispensed with, and that the branch 1 may run directly from A to the carbon rod T. It is true that in this case there would be a circuit through the first set of carbons, orwhat remained of them, after the second set began to burn; but the resistance of such circuit would be so great as practically to cut out the first set.

What I claim is- 1. The herein-described mechanism for aumatically switching the current from one set of carbons to the other, consisting of the mag-- net D, carrying a coil of fine wire which is located in a shunt around the arc,-and also a 'eoil ofcoarse wire which. is adapted to form end a clutch for operating to feed each set of carbons, of an arm, K, magnet D and its core, and spring Y' for making operative successively the clutches when they are thrust within its reach by the tilting lever, the motions of the lever being controlled by the partial or entire consumption of a set of carbons, as specified.

3. In an electric lainp,a slotted core for the main and shunt magnets, a slotted block sliding within the slot in the core, a pin passing through the core and a slot in said block, an

arm connected with said pin, and a pair of contacts adapted to be brought together by the movement of said arm, the said contacts completing a circuit to cut out the lamp, substantially as described.

4. The combination, in an arc-lamp, with the coarse and fine wire magnets for estab dishing and regulating the length of the are,

of a magnet carrying a coil of coarse and fine wire, the fine wire being in a shunt around the arc and the coarse wire adapted to be thrown in circuit with the second set of carbons, and having a movable core which is at tached to one end of a tilting lever, which carries at each end a clutch to feed each set of carbons, and a spring connected to the other clutches when they are lowered upon it by the tilting lever, the motions of the lever be ing controlled by the partial or entire consumption of a set of carbons, as described.

5. In an electric-arc lamp in which two sets of carbons are burned successively, the-combination of arc establishing and regulating magnets, a core movable therein, clutches, an arm actuated by the movable core and extending beneath the clutches, and a device engaging both clutches for holding them, one at a time, out of the Way of the arm when the latter moves up to establish the are.

6. The herein-described mechanism for antomatically switching the current from a burned-out set of carbons to an unburned set of carbons, consisting of an independent circuit for each'set of carbons, and the are establishing and regulating mechanism, in combination with a tilting lever carrying at each end a clutch for feeding each set of carbons, a magnet carrying a eoil'of coarse and fine wire, the fine wire being in la shunt'around the arc and the coarse wire adapted to be thrown in circuit with the second set of carbons when the first set has been consumed, the core of said magnet being movable and carrying a contact-piece which plays between two pairs of contacts so arranged that when the said contact-piece bridges one pair the main current passes through the first set of carbons and shunts the said magnet and the second set'of carbons, and when the contactpiece bridges the other pair of contacts the main current passes through this magnet and the second set of carbons and shunts the first set of carbons, substantially as set forth. v 7. A cut-out for an electric-are lamp, consisting of the main and shunt arc establishing and regulating magnets, respectively, of aslotted core movable therein, a pin passing through the side thereof, an arm secured to said pin, a slotted block inserted in the slot in the core and hung on said pin, a spring supporting the weight of said core, and a pair of contacts adapted to be brought together to cut out the lamp by the movement of said arm, the movement, of said am being produced when the shunt-magnet increases in strength abnormallyqdue to the consumption of the carbons in the lamp, substantially as described. 3 CLARENCE B. NOBLE.

\Vitnesses:

JANE W. HUTCHINSON, ELLEN II. B. NOBLE.

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