US513111A - Electric aec lamp - Google Patents

Description

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(No Model) W. JANBUS. ELBGTRIG ARG LAMP.

Patented Jan. 23, 1894.

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W. JANDUS. ELECTRIC ARG LAMP.

No. 513,111. Patented Jan. 23,1894.

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W. JANDUS. ELECTRIC ARG LAMP.

No. 513,111. Patented Jan. 28,1894.

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WILLIAM .IANDUS, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO JOIIN B. BARTON, OF SAME PLACE.

ELECTRIC- SPECIFICATION forming part of Letters Patent No. 513,1 11, dated January 23, 1894.

Application tiled October 22,1892. Serial No. 449,614. (No motleld To @ZZ wil/011e it may concern.:

Be it known that I, lVILLIAM JANDUS, a citizen ot the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specitication, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

The annexed drawings and the following description set forth in detail, one mechanical form embodying the invention; such detail construction being but one of various mechanical forms in which the principal of the invention may be used.

In said annexed drawings-Figure I represents a vertical section of my improved electric are lamp; Fig. II, an enlarged sectional detail view of the upper end of the tubes which support the lamp; Fig. III, a section of the auxiliary carbon holding tube; Fig. III, a cross section of the same on theline A-B, Fig. III; Fig. IV, a section of the magnets and the movable armature; Fig. IVa, a cross section on the line O-D,Fig. IV; Fig. IV", a cross section on the line E-F, Fig. IV; Fig. V, a vertical sectional detail View of the carbon feeding mechanism, Fig. V,a cross section on the line I-J, Fig. V; Fig. VI, a verti cal section of the carbon feeding mechanism, the surrounding casing for the same, and the upper portion of the globe; Fig. VI, a cross section on the line G-IL Fig. VI Fig. VII, a section of the support for the negative carbon Figs. VIII and XII, sectional detail views ot the clutch mechanism, respectively showing the positive carbon clutched and raised to form the arc, and in its position of release; Figs. IX, X and XI, respectively a section, a top, and a bot-tom view of the collar for the lower brushes; Figs. XIII and XIV sectional detail views ot the negative carbon holder and the lower end of the carbon supporting frame; Figs. XV and XVI, sections of two other forms of magnets; Fig. XVII, a sectional detail view of another form of cutoff sleeve for the shortcircuiting device, and Figs. XVIII and XIX, sectional detail views ot the movable armature and the clutch rings, the sections being made at right angles to each other.

The lamp illustrated in the drawings is a hanging lamp or lamp destined to be supported from above. An insulating plug, L', has a threaded socket, L5, secured upon its upper end, by means of which socket the lamp may be secured pending from the ceiling of a room or from other elevated support. A supporting tube L is screwed with its upper end to the lower end of the insulating plug, and clamps an insulating disk, L2, between its upper end and a shoulder upon the plug. The ends et' the conductors of a supply circuit are secured to a negative binding screw, L?, and a positive binding screw, L; and the ends of the negative terminal conductor, tu', and positive terminal conductor, w, are secured in contactwith said line conductors by means of said binding screws. The lower end of the supporting tube L is screwed upon the upper end of a carbon-containing tube t, upon the upper portion of which adisk, a, having a central aperturac?, is secured by said central aperture. The disk a is of soft iron and forms a portion of the upper magnet, having limbs, ct', projecting downward. A similar disk, b, of the lower magnet, is secured to the carbon-containing tube t, by means of a flange, t', fitting into a rabbet, b3, in the central opening, b2, of the lower magnet disk; or said disk may be brazed or otherwise secured to the tube. The lower magnet disk has upwardly projecting limbs, if', and said limbs have axial bores, corresponding to similar bores in the limbs of the upper magnet. The bores of the lower magnet extend entirely through the limbs, while the bores in the limbs of the upper magnet extend only partly through said limbs. Tubes, d, of brass are secured in the bores of the magnetlimbs and in airtight engagement therewith; their lower ends resting upon shoulders formed in the lower ends of the lower bores, so as to make continuous and smooth bores through the limbs. The ends of the limbs of the two magnets are at a predetermined distance from each omen-such distance being determined by the length of the interior brass tubes,-so as to produce acon- IOD ' a I 513,111A

densed magnetic tield between the ends of the magnet limbs; the said field being tigzed and adjusted according to the length of pull required or the length of travel ot'` the armature cores.

The series and shunt coils are wound in the usual manner, but in such directions that all of the several poles of the magnets will be in magnetic series. Said term, via-magnetic series, is employed for the magnets as analogous to the term series when employed to describe the arrangement of electric generating or translating devices, Viz.-with their poles opposed to other poles of opposite polarities or denominations; so that the north pole of one magnetis opposed to the south pole of the other magnet and the south pole of said tirst-named magnet is opposed tov the north pole of the second magnet. The magnets are consequently in magnetic series, and

,..-v'the magnetic circuit in the magnets will be completed when the armature is so attracted that it closes the magnetic gaps between the poles of the magnets.

I prefer to wind the series coil, M, upon the lower magnet, and the shunt coil, M', upon the upper magnet, as illustrated in Fig. II, but may employ compound winding, as illustrated at M3, in Figs. V and VI, in which the compound coil is shown as wound upon spools, M2. In either case, the upper magnet serves, so to speak, as a stationary armature to the lower magnet, and vice versa; -the magnetic circuit being completed through the gaps between the poles, where the field is powerfully condensed. The same condensation of the field may be obtained by simply forming the stationary armature in the shape of a bar or disk supported at the desired distance from the ends of the magnet limbs by the brass lining tubes, as illustrated in Figs. XV and XVI. In the form illustrated in Fig. XV, the limbs of the movable armature are long, and extend through the entire length of the limbs ot' the magnet; and in the form illustrated in Fig. XVI, the limbs ot' the movable armature are short and extend through the stationary armature into the ends of the magnet limbs. In either case the magnetic circuit finds a path, from one pole to the other, through the stationary armature and the field is condensed at the points between the poles of the magnet and the opposite poles of the stationary armature. This condensation of the ield is ot' great importance as it enables me to operate the movable armature and the carbon clutch with a comparatively small number of ampere turns of wire in the coils, obviating the use of levers and other power multiplying devices for producing a strong dierential effect. The magnetic field is highly condensed within the gapsbetween the opposed poles of opposite denominations of the two magnets, and the cores of the armature do not close the magnetic circuit until completely drawn up into the gap so as to be within the bores of the upper magnet.

The strong pull caused by this arrangement of magnets in magnetic series and with gaps between all of the opposed poles of opposite denominations, is entirely dependent upon said gaps within which the magnetic force is condensed. The gaps are absolutely essential 'to the operation of this style of magnet; as it destroys or is detrimental to the ethciency of the magnet to close the magnetic circuit before Athe armature arrives at the end of its attracted position, when it simply acts as a keeper, uniting the two magnets into one. A circular armature disk, c, has two upward- 1y-projecting cores, c', and has a central aperture for the carbon containing tube, from which aperture slots, c2 and c3, radiate; said slots having their outer ends beveled to face upward, and the slots c2 having the bevels at a greater angle to the sides of the central eperture than the slots c3. Small metallic bodies, e, ot' spherical shape, such as shot, are placed in the brass tubes, at the ends ot' the armature cores, so as to always insure metallic contact. The lower end of the positive terminal conductor w is secured, by means of c a nuty, to a screwthreaded binding post, y, which latter is secured in the upper magnet disk a and insulated from the same by means of a non-conducting sleeve, wg; and the cur-l rent passes through said binding post to the terminal, m', of the series coil, M, which terminal is secured to the binding post by a suitable nut. The series coil is wound upon both magnet limbs, and its other terminal, m2, is in contact with the upper disk, a, conveying the current through said disk to the carboncontaining tube t. Said terminal m2 is held to the disk by a ange upon the lower end of an insulating sleeve, 'm4, and by a suitable nut upon a screwthreaded rod, j, which forms a part ot the negative conductor within the lamp, the terminal being thus insulated from said rod, which is also insulated from the disk by passing through the insulating sleeve. The negative terminal conductor w is attached to said negative conductor rod by means of a binding nut w3. The terminals, m3 and m4, of the shunt coil, M', are clamped and connected to the positive and negative terminals, across the arc. A shortcirouiting device, x, is connected across the terminals of the series coil, and is formed by a wire, 0c', doubled into the form of a loop having parallel limbs, and wound in parallel strands around an insulating post, x2, secured at its upper end upon the lower end of the positive binding post y. The doubled, lower end ot' the looped wire is secured to the post by means of a screw, screwed into a countersink, x7, in the post. The length of the shortcircuiting device and, consequently, the degree of the resistance in the same may be Varied by means of an internallyscrewthreaded metallic sleeve, ac3, having parallel threads cut in it to engage the parallel limbs of the wire,so as to be moved up or down upon the coil and thus shortcircuit it at any desired point.

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One terminal of the shortcircuiting device is secured to the post by a screw, il, which is in contact with the positive binding post yror one terminal of the series coil,-and the other terminal ot' the shortcircuiting device is secured against and in contact with the upper disk c,or the other terminal of the series coil,-by means of the lower binding screw upon the positive binding post y; being insulated from the latter by the insulating sleeve tu?.

Instead of employing the screwthreaded sleeve 503, a plain sleeve may be used, as illustrated in Fig. XVII, said sleeve having a set screw, m8, by means of which the sleeve may be brought into metallic contact with vdifferent portions ot' the wire eiiecting a shortcircuit at any desired point. The degree ot' the resistance of the shortcircuiting device may thus be adjusted by sliding the sleeve, up or down, according to whether the resistance is to be decreased or increased, and this adjustable shortcircuiting coil will be perfectly certain in its operation and will occupy but a small space in the lamp. The lower end of the negative conductor rod j is coupled,-by means of a coupling sleeve, 7e3-t0 a rod,j, which passes through a metallic sleeve, Z, inserted through the lower magnet disk l), but insulated from the same by means of a suitable insulating sleeve. The lower end of said rod is secured in a disk, 0, which forms a part of the negative conductor within the lamp. A nut, m tits upon the rod j', and said nut and rod form one of the supports for the disk 0. A corresponding rod,j2, has its lower end secured in the disk 0; passes up through a metallic sleeve, Z,inserted through the lower magnet disk and insulated from the same,-and enters the lower end of the insulating post for the shortcircuiting device. A nut, m5, upon this rod, above the lower magnet disk, serves to support the disk o, similar to the nut on. This rod j? and its sleeve Z form,- together with disk 0 and the rod j', sleeve l, and `rodj`,a part oi the negative terminal conductor Within the lamp. The disk 0 has a downwardly projecting, serewthreaded neck, o2, within which an insulating sleeve or packing, o', is secured; said sleeve insulating the negative disk from the positive carboncontaining tube t. An oblong carbon-supporting frame, r, is secured with a screwthreaded opening, 01', in its upper end to the screwthreaded neck o2, and said frame has a screwthreaded opening, r2, in its lower end, formed with an upwardly contracted, smooth portion, r3, which terminates in a smooth and straight opening, r4, of a diameter suiiicient to admit a carbon pencil ot the greatest diameter capable of use in the lamp. A lower, negative carbon holder, s, has a screwthreaded sleeve, s2, which may t into the lower screwthreaded opening of the carbon-supporting frame, and has a tube, s', secured inside said sleeve; said tube having its upper end slightly beveled and having longitudinal slits in its upper portion, which admits of the tube being contracted at its upper end to clamp the carbon, when the carbon holder is screwed up into the lower opening ot the earbon-supporting frame. An insulating handle, s3, is secured in the Vlower end of the carbon-holder by means of a rivet or pin, s, inserted through the outer screwthreaded sleeve, the slitted tube, and the end of the. handle. A cup-shaped pan, s4, is iitted around the handle, to slide upon the same, beneath the lower ends of the tube and sleeve, and is insulated from said tube and sleeve by an insulating washer, S5. A spring, 58, is coiled around the handle, and bears against a shoulder upon the saine with its lower end, and said spring is inclosed by a sliding sleeve, 5", having an inward flange, S9, at its upper end, which rests upon the upper end of the spring, and bears against the pan. The carbon-containing tube 't has longitudinal slots, 155, and two rings, t and t2, are suitably secured, one above the other, around the slotted portion of the tube. Rings, 153,-having grooved peripheries to engage the carbon, and forming radial clutches for the same,- are hung upon supporting ring t6, and have play in the upper portions of the slots, and in the radial slots c2 and c3 of the armature. Similar rings, t1, forming the upper radial brushes, are hung,to have play in the lower portions of the slots,-upon the lower supporting ringz?. The disk o has an 11p-turned edge or flange, o5, aroundits central opening, and the upper radial brush rings t* may have contact with said flange when the carbon is removed. A nut, u, is fitted upon the lower screwthreaded portion of the carbon-containing tube t, and serves to rigidly clamp a casing, e', between the disk 0 and lower magnet disk b securely binding together the lamp structure on the central tube t. A collar, o, is secured upon the lower end of the carboncontaining tube, and is formed in its lower end with slots, in which lower-brush rings, o2, have play, said rings being supported by a ring, e', secured to the collar. A casing, t',

' is clam ed between the lower magnet disk I) and the negative disk o, said disks being drawn together by the nut u, and asbestus rings or similar insulating rings,p, are interposed between the under side ot' the lower magnet disk and the upper edge of said casing, and between the upper side of the negative terminal disk o and the lower edge of the casing so as to form an airtight, insulating and non-combustible packing for the chamber formed by the parts and inclosing the armature and clutch device. Insulatin g sleeves, n, are secured upon the rods j', and j?, serv- ICO ing as stops upon which the armature may rest when lowered. The edge of the upper opening in the globe, e', is clamped between the negative disk o and the carbon frame r; insulating asbestus washers, p2 and p3, being interposed, as well as a metallic washer, q, be-

tween the carbon frameand the lower washer p3, which serves to stiften and support said washer. The upper portion of the globe is thus closed air-tight. The edge of the pan bears against the lower opening in the globe. A collar, h, surrounds 'the lower end ot' the airtight chamber z', and rests upon thetop ot' the globe. A collar, f3, having openings formed inv it, is secured upon the upper por tion of the airtight casing t', and has a liange,

g, into which the lower end of a cylindrical casing,f, tits. The upper portion of said cylindrical casing is formed with air holes, f. The upper end of the cylindrical casing f is contracted, and the lower end of a tube, f2, is secured to said contracted end. This tube f2 surrounds the tube L; and a canopy, L6, is secured to the upper end of said outer tube f2, and surrounds the socket at the end of the inner tube L and the binding screws.

A positive carbon-holding tube, N2, may be used to lengthen the life of the positive carbon, and said tube has a slightly contracted, long socket portion, N5, at its lower end into which the carbon may be inserted; said socket portion having longitudinal slits, N4, which render the socket elastic. The upper end of the elastic socket is formed with an inwardly projecting bead, N3, which serves as a stop for the end of the carbon.

The positive carbon is lettered N, and the negative carbon is lettered N', in the drawings.

It' desired, the binding post connections at the upper end of the supporting tube L and its surrounding tube, may be dispensed with, and the terminal conductors may extend at the upper ends of the tubes L and f2, through the insulating plug, where they may be suitably connected to the circuit wires. y

The carbons are inserted into the lamp by uuscrewing the lower carbon-holder from the threaded opening in the carbon-supporting frame. The removal of the carbon holder and pan admits ot' the inside of the globe, as well as the carbon-supporting frame and other parts within the globe being cleaned; the lower opening ot' the globe affording ample room for the insertion of the hand and a cloth or other cleaning means. The positive carbon may now be inserted through the opening in the lower end of the carbon-supporting frame, the upper, contracted portion of said opening admitting a carbon of the greatest diameter capable of use in the lamp, but preventing the insertion of a carbon of agreater diameter than what will enter the radial brushes and clutches. The end of the carbon, as it passes up through the lower brushes, will push said brushes outward and will push them out of contact with the 11p-turned rim of the'negative terminal disk o, whereupon the carbon pushes the clutch rings out, and is in position to be held by the same when the currentis turned on and the armatureis drawn up. The negative carbon is placed inthe slitted tubeof the carbon-holder, and will be clamped when the latter is screwed -in place. As thel rings, the upper brush-rings, and the lower brush rings,-and will always be well centered, irrespective ot' any minor irregularities in the shape of the carbon. The brushes and clutches will, on account of their form,-beV ing shaped as rings,-have a yielding contact with the carbon, such contact being partly rolling and partly sliding. When the carbons are secured and the current is turned on, the current will pass through the positive conductor and the positive binding post, through the series coil, and to the upper magnet plate a from which it will pass into the carbon containing tube to the positive carbon, passing through the brushes and clutch. From the positive carbon it passes through the negative carbon, through the carbonholder and carbon-supporting frame to the negative terminal disk o, through said disk to the negative terminal rods j and j, and to the negative conductor.' The circuit being completed,'the series coil energizes the magnets which attract the movable armature. The latter draws the clutch rings upward, and forces them against the carbon, as the beveled ends of the slots in the armature strike upward; the arc is formed, and the lamp is in operation. The clutch rings in the radial slots c2 will iirst engage thecarbon with a slight clutch, when the armature is drawn upward, on account of the longer and less steep incline ofthe bevels of said slots; and the clutch rings in the slots c3 will next engage the carbon with a stronger clutch, on account of the steeper incline of the bevels ot` said slots, so that the armature will gradually raise the carbon and form the arc. When the armature is lowered, a similar gradual release of the carbon may take place, corresponding to the gradual clutch of the carbon by the attracted armature; the clutches which are engaged by the steep inclines releasing the carbon, whereupon the clutches engaged by the less steep inclines will allow the carbon to drop, exerting, however,a braking influence upon the carbon, as they revolve upon the inclines. When the positive carbon has been consumed so that its upperv end falls below the clutches and cannot be held by the same, the current will iirst pass freely through the carbons, energizing the magnets so that they draw the movable armature upward in contact with the cut-out sleeves Zand t; forming the circuit through the armature,

the cnt-out sleeves and the negative terminal rods, and short-circuiting it from the electrodes. This cut-out will consequently be through the series coil and by the series coil.

It' the current should be turned on while no positive carbon is in the lamp, the primary contact will be throughl the lower brushes,

down in contact with the upwhich hang IOC IIO

of an arc-inclosing chamber closed air-tight at its top and sides, a carbon-supporting frame secured in said chamber, a carbon-holder secured in the lower end of the carbon-supporting frame, and a pan yieldingly supported upon said holder and closing the bottom of the arc-inclosin g chamber, substantially as set ,foi-th.

8. In an electric arc lamp, the combination of an arc-inclosing chamber closed air-tight at its top and sides, a carbon-containing tube opening into the top of said chamber, a carbon-supporting frame secured in the arc-inclosiiig chamber, a carbon-holder secured in said carbon -supporting frame, and a pan yieldingly supported upon said holder and closing the bottom of the arc-inclosing chamber, substantially as set forth.

9. In an electric arc lamp, the combination of an arc-inclosing chamber closed air-tight at its top and sides, a carbon-containing tube opening into the top of said chamber, a carbon-supporting frame supported at its upper end in the top of the arc-inclosing chamber, a carbon-holder secured in the lower end of said carbon-supporting frame, and a pan yieldingly supported upon said holder and closing the. bottom of the arc-inclosing chamber, substantially as set forth. y

10. In an electric arc lamp, the combination of an arc-inclosing chamber closed air-tight at its top and sides, a carbon-containing tube eX- tending into the top of said chamber, a carbon-supporting frame secured at its upper end in the top of the arc-inclosing chamber, a carbon-holder secured in the lower end of the carbon-siipporting frame, and a pan yieldingly-supported upon said holder and closing the bottom of the arc-inclosing chamber, substantially as set forth.

11. In an electric arc lamp, the combination of an arc-inclosingv chamber closed at its top and having an opening at its bottom, an upper carbon-container entering through the closed top of the chamber, and a frame in the chamber having an opening at the bottom-opening of the chamber, registering with the carbon-container, and of a diameter equal to the diameter of the greatest capacity of said container,-tlie opening in said frame being so located as to form the only passage for the insertion of carbons into the upper container, substantially as set forth.

l2. In an electric arc lamp, the combination of an arc-inclosing chamber closed at its top and having an opening in its bottom, an upper carboncontainer entering through the closed top of the chamber, a carbon-supporting frame within the chamber and having an opening at the bottom opening of the chamber, registering with the upper carbon-container and of a diameter equal to the diameter of the greatest capacity of said upper container, and a lower carbon-holder secured in said opening,-said opening in the carbonsupporting frame being so located as to form the only passage for the insertion of carbons a diameter equal to the greatest diameter of the carbon capable of being held in said tube,

and a carbon-holder secured in said openingl in the frame,-said opening in the carbonsiipporting frame being so located as to form the only passage for the insertion of carbons into the upper container, substantially as set forth.

14. In an electric arc lamp, the combination of a carbon-supporting frame forming one series terminal, a metallic lower carbonholder removably secured in said frame and in contact with the same, and an insulating handle in the lower end of said carbon-holder, substantially as set forth.

15. In an electric arc lamp, the combination of an arc-inclosing chamber formed with a hand hole at its bottoni, a lower carbon-holder forming one series terminal, and a closure for the hand hole yieldingly supported by and insulated from the carbon-holder, substantially as set forth.

16. In an electric arc lamp, the combination of an arc-inclosing chamber, a lower carbonholderforming a series terminal,an insulated handle secured in the lower end of said carbon-holder, a pan yieldingly supported upon said handle and covering the bottom opening of the arc-inclosing chamber, and a washer upon the handle and at the lower eiid of the carbon-holder,-said washer serving as an upper stop for said pan, substantially as set forth.

17. In an electric arc lamp, the combination of an arc-inclosing chamber, a carbon-supporting frame secured in said chamber and formed with an opening in its lower end having a screwthreaded portion "and an upper tapering portion, a carbon-holder having a screwthreaded portion and a slittedportion and fitting in said opening, and a pan yieldingly-supported upon said carbon-holder, and covering the open bottom of the arc-inclosing chamber, substantially as set forth.

18. In an electric arc lamp, the combination of an arc-inclosing chamber having an opening at its bottom, a carbon-holder at the bottom of said chamber provided with a handle, a spring upon said handle, and a pan fitted to slide upon the handle and cushioned by said spring, said pan fitting to close the opening in the arc-inclosing chamber, substantially as set forth.

19. In an electric arc lamp, the combination of an arc-inclosing chamber having an opening at its bottom, a carbon-supporting frame supported within said chamber and having an opening at its lower end formed with a screwthreaded portion and an upwardly ta pering upper portion, a caibon-liolder consisting of a screwthreaded sleeve fitting in the threaded portion of said opening and a slitted tube having its slitted end entering the tapering portion of the opening, and provided with an insulated handle, a spring upon said handle and confined upon the saine at its lower end, a sleeve over said spring and formed with a ilange bearing against the upper end of the same, and a pan fitted to slide upon the handle to bear against the flange and closing the opening in the bottom of the arc-inclosing chamber, substantially as set forth.

20. In an electric are lamp, the combination of an electrode-containingtube, sets of radial brushes supported, one above the other upon said tube, a set of radial clutches supported upon the tube, and the armature of the electro-magnet in the lamp constructed to actuate said clutches, substantially as set forth.

2l. In an electric arc lamp, the combination of clutches suspended to have longitudinal and radial movement in relation to the electrode, and brushes suspended at a distance below said clutches to swing radially and to engage the electrode by their gravity,-said brushes thereby feeding the current to the electrode and completely centering and guiding the same, substantially as set forth.

22. In an electric arc lamp, the combination of an electrode-containing tube, clutches radially suspended in said tube to engage the electrode from radiating directions, and current feeding and centering brushes suspended in the lower end of the tube gravitating toward the axis of the same,-said brushes thereby feeding the current to the electrode and centering the same at its lowermost point of support, substantially as set forth.

3. In an electric arc lamp, the combination of two sets of radial brushes, arranged one above the other to support the electrode, a set of radial clutches arranged above said brushes, and the armature of the electroniagnet in the lamp, constructed to actuate said clutches, substantially as set forth.

24. In an electric arc lamp, the combination of an electrode-containing tube, an electro magnet having a movable armature, and a plurality of sets of rings pivoted to projectinto the interior of the tube, one of said sets capable of being engaged by the armature and to be forced toward and from the axis of the tubo by the movement of the armature, substantially as set forth.

25. In an electric arc lamp, radially arranged brushes suspended at points above their cent-ers of gravity to swing inward and engage the electrode by their gravity, substantially as set forth.

26. In an electric arc lamp, radially ar ranged brushes suspended to have longitudinal and radial play relatively to the electrode,

and to engage the same by their gravity substantially as set forth.

27. In an electric are lam p the combination of an electrode-containing tube, and brushes suspended to have longitudinal and radial play through the sides of said tube and to engage the electrode within the latter by their gravity, substantially as set forth.

2S. In an electric arc lamp, the combination of clutches radially suspended around the electrode, and a separate movable armature of the electro-magnet in the lamp,-said armature constructed to engage and actiiate the clutches when attracted, substantially as set forth.

29. In au electric arc lamp, the combination of an electrode-containing tube formed with longitudinal slots, and rings pivotally stipported in said slots, to engage the electrode, substantially as set forth.

30. In an electric aic lamp, the combination of clutches suspended radially in their relation to the electrode, and a separate movable armature of the electro-magnet in the lamp,- said armature having surfaces which engage and actuate the clutches when the armature is attracted, substantially as set forth.

3l. In an electric arc lamp, the combination of radially arranged clutches suspended .to have longitudinal and radial movement in their relation to the electrode, and a separate movable armature of the electro-niagnet in the lamp,-said armature having surfaces adapted to engage and force inwardly said clutches, substantially as set forth.

In an electric arc lamp, the combination of radially arranged and pivotally supported clutch rings, an electro-magnet, and a movable armature for the same formed with beveled surfaces engaging said rings when the armature is raised, substantially as set forth.

33. In an electric arclamp, the combination of clutches suspended to have longitudinal and radial play in their relation to the electrode, and a separate movable armature of the electro-magnet in the lamp,-said armature having beveled surfaces engaging said clutches,substantially as set forth.

Si. In an electric arc lamp, the combination of an electrode-containing tube, clutches suspended to have longitudinal and radial play through the sides of said tube, and a separate movable armature of the electro-magnet in the lamp,-said armature having beveled surfaces engaging said clutches, substantially as set forth.

35. In an electric are lamp, the combination of radially arranged clutches, and a movable armature of the electro-magnet in the lamp, constructed to successively engage pairs of opposite clutches when attracted by the magnet, substantially as set forth. t

3G. In an electric arc lamp, the combination of radially arranged clutches having longitudinal and radial play relatively to the electrode, and a movable arniatui'e having opposite surfaces of different incline from IOO IIO

pairs of opposite clutches, and an armature ofthe electro-magnet in the lamp formed with pairs ofopposite inclined surfaces having different inclines to successively actuate the pairs of opposite clutches, substantially as set forth. l Y

38. In an electric arc lamp, the combination of clutch rings arranged in pairs of opposite rings to have radial and longitudinal play relative to the electrode, and a movable armature of the electro-magnet in the lamp, constructed with beveled surfaces arranged in opposite pairs to engage said rings, each pair of opposite surfaces having a different incline so as to successively actuate the pairs of clutch rings, substantially as set forth.

39. In an electric are lamp, the combination of a longitudinally slotted electrode-containing tube, rings pivotally'supported to project through the slots of the tube and into the same, and a movable armature of the electroniagnet in the lamp, said armature having upwardly beveled surfaces engaging said rings, substantially as set forth.

40. In an electric arclamp, the combination of the series terminals, and current feeding brushes suspended from one of said terminals to engage the electrodo by gravity and to swing down into contact with the other terminal when the electrode is removed, substantially as set forth.

41. In an electric arc lamp, the combination of one series terminal, current feeding brushes supported from said terminal to have radial and longitudinal movement relative to the electrode and t0 be moved upward and outward by the insertion of said electrode, and the other series terminal havinga projection engaged by the brushes when the electrode is removed, substantially as set forth.

42. In an electric arc lamp, the combination of a series terminal having an electrode-container, the other series terminal having a projection, and brushes supported in said electiode-container to have longitudinal and radial play relativo to said container and `to have contact with the projection when the electrode is removed, and to be brought out of such contact when the electrode is inserted, substantially as set forth.

43. In an electric arc lam p, the combination of one series terminal having a tubular electrode container, the other series terminal formed with a projecting portion, and brushes supported in said former terminal to have longitudinal and radial play in their relation to Said electrode-container and adapted to have contact with said projection when the electrode is removed from its engagement with the brushes and to be brought out of such ported to have longitudinal and radial play through the sides of said tube, and a disk through which the electrode-containing tube passes, said disk forming a part of the other terminal ofthe series and being formed with an annular flange adapted to have contact with said brushes when the electrode is removed, and to have such contact interrupted when the electrode is inserted, substantially as set forth.

45. In an electric arc lamp, the combination of one terminal of the series, the movable armature of the electrode-feeding mechanism, said armature forming a part of said terminal, and a contactformingapart of the other terminal of the series and arranged to have contact with the armature when the latter is at the extreme of its attracted position, substantially as set forth.

46. In an electric arc lamp, the combination of one terminal of the series, clutches for the electrode movablysupported in said terminal and in contact with the same, a movable armature engaging said clutches when attracted, and a contactforming a part of the other terminal of the series and arranged to have con-V tact with the armature when the latter is at the extreme of its attracted position, substantially as set forth.

47. In an electric arc lamp, the combination of an electrode-containing tube forming one terminal of theseries, clutches supported in said tube to have longitudinal and radial play in the'same, a contact forming a part of the other terminal of the series, and a movable armature having in'clined surfaces engaging the clutches when attracted and forming a cut-out contact with the terminal contact when at the extreme of its attracted position, substantially as set forth 48. In an electric arc lamp, the combination of a disk forming a part of one terminal of the series, an electrode-containing tube secured in electrical contact with said disk through the center of the same, clutches movably supported upon said tube to have longitudinal and radial play through the sides of the same and in electrical contact with the same, a movable armature having inclined surfaces engaging and having contact with said brushes when attracted, and contacts inserted through but insulated from the disk, forming parts of the other terminal of the series, and having electrical cut-out contact with the armature when the latter is at the extreme of its attracted position, substantially as set forth. Y

49. Two or more magnets arranged with all of their poles in a complete magnetic series and with gaps between all of their opposite IOO .IOS

poles, in combination with an armature movable within such gaps to complete the magnetic circuit, substantially as set forth.

50. Two or more electro-magnets arranged with all of their poles in a complete magnetic series and with gaps between all of their opposite poles, in combination with an armature movable within such gaps to complete the magnetic circuit, substantially as set forth.

5l. In an electric arc lamp, the combination of an electrdmagnet of the horseshoe type formed with axial bores in its limbs, another electromagnet of the horseshoe type arranged with both of its poles at a distance from the poles of said first magnet and in magnetic series with the latter, and formed with bores registering with the bores in the limbs of the first magnet, and a movable armature having cores sliding within the bores of said magnets and in the joint fields of the same, substantially as set forth.

52. In an electric are lamp, the combination of an electro-magnet of the horseshoe type having axial bores in its limbs, another electro-magnet of the horseshoe type arranged with both of its poles at a distance from the poles of the first magnet and in magnetic series with the latter, and formed with axial bores in its limbs, brass tubes secured within said bores to space apart the poles of the magnet, and a movable armature havingits cores sliding within said tubes and in the joint fields of said magnets, substantially as set forth.

53. In an electric arc lamp, the combination of an electro-magnet of the horseshoe type formed with axial bores in its limbs, another electro-magnet arranged with both of its poles at a distance from the poles of the first magnet and in magnetic series with the latter, brass tubes secured within said axial bores to space apart the poles of the magnet, and a movable armature having cores sliding within said tubes in the joint fields of said magnets, substantially as set forth.

54. In an electric arc lamp, an electro-magnet having axial bores in its limbs, another electro-magnet having registering bores and arranged with its poles at a distance from the poles of said magnet and in magnetic series with the same, and lining tubes within the bores and the armature,-said magnets and tubes forming a portion of a series terminal, in combination with a movable armature having its cores sliding within the lining tubes and in the fields of said magnets and forming a movable part of a series cut-out, and metallic pellets within the lining tubes and in electrical contact with the armature cores and said tubes, substantially as set forth.

55. In an electric arc lamp, the combination of an airtight casing, an electro-magnet having a disk forming the top of said casing and having bores through said disk and through its limbs, an electro-magnet having axial bores through its limbs registering with the bores of said first electro-magnet, metal tubes fitted in said bores and having their upper ends closed air tight, and an armature in the casing having its cores sliding in said tubes, substantially as set forth.

5G. In an electric arc lamp, the combination of an arc-inclosing chamber closed air-tight at its sides and top, a tube fitted in the top of said chamber and closed air-tight at its upper end, said tube serving as an electrodecontaining tube, clutch mechanism and current-feeding mechanism for the electrode engaging the same through slots in said tube, and an airtightehamberinclosing the slotted portion of the tube, substantially as set forth.

57. In an electric arc lamp, the combination of a central electrode-containing tube, an arcinclosing chamber supported from the lower portion of said tube, an electromagnet upon the tube above said chamber, and electrode and current feeding mechanism supported by said tube, between the electro-magnet and the arc-inclosing chamber, substantially as set forth.

5S. In an electric arc lamp, a carbon-holding tube formed with a contracted socket portion having longitudinal slits closed at both ends, substantially as set forth.

59. In an electric arc lamp, a carbon-holding tube formed with a contracted and longitudinally slitted socket portion and with an internal bead stop above said socket portion, substantially as set forth.

60. In an electric arclamp, the combination of a central carbon-containing tube, an elec tro-magnet supported upon said tube, a negative terminal disk supported upon the tube, and a nut upon the lower end of said tube securing said disk upon the tube, substantially as set forth.

6l. In an electric arclam p, the combination of a central carbon-containing tube, an electro-magnet secured upon said tube and having a disk, a negative terminal disk upon the tube, a casing between the magnet disk and terminal disk, and a nut upon the lower end of the tube securing the disk and clamping it against the casing, substantially as set forth.

6:2. In an electric arc lamp, the combination of a central carbon-containing tube, an electro-magnet secured upon said tube, clutches supported upon said tube, an armature sliding around said tube and actuating said clutches, brushes supported upon said tube, a negative terminal disk supported upon said tube, a nut upon the tube and securing said disk, a lower carbon-supporting frame supported upon said tube, and a globe clamped between said frame and terminal disk, substantially as set forth.

G3. In an electric arc lamp, the combination of an arc-inelosing chamber, au airtight casing communicating with said arc-inclosing chamber, an electro-magnet outside of said casing and having airtight bores communicating with said airtight casing, and an armature in said airtight casing and having cores gaged and actuated by the armature, to have radial play in their relation to the electrode, and to bear against the same by gravity Wh en disengaged from the armature, and setsof brushes suspended to have radial play in their relation to the electrode and to engage the same by `gravity, -said sets of clutches and brushes being arranged at distances above zo one another to engage and center the electrode at aplurality of points, substantially as set forth.

66. In an electric arc lamp, the combination of a feeding coil, an armature for the same formi-ng a series terminal, and a contact forming another series terminal and in the path of said armature when the latter is attracted, substantially as set forth.

In testimony that I claim the foregoing to be my invention I have hereunto set my hand this 19th day of October, A. D. 1892.

WILLIAM JANDUS.

Witnesses:

WM. SECHER, J. C. TURNER.

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