US650888A - Electric-arc lamp. - Google Patents

Description

No. 650,888. Patented June 5, I900. J. J. WOOD.

ELECTRIC ABE LAMP.

(Application filed Oct. 10, 1899.) (No Model.) 2 Sheats$hao'l l.

WITNESSES:

. INVI:IN%ZI JZZMZ w Wy I By his Alto/ways.

m: Norms PETER; 00., PHOTO L!7HO.. WASHINGTON, D. c.

Np. 650,888. Patented June 5, I900.

, J. J. woon. ELECTRIC ABC LAMP.

(Application filed on. 19, 1899.) (No Model.) 2 'SheetsSheat 2.

FIG, 7.

WITNESSES: INVENTOR:

flu By his 1480;111:313,

W avzm g U ITE STATES PATENT OFFIC JAMES J. WOOD, OF FORT W'AYNE, INDIANA.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 650,888, dated June 5, 1900.

Application filed October 10J 1899. Serial No.- 733i (N0 111 To all whom it may concern:

Be it known that I, JAMES J. Wool), a citizen of the United States, residing at Fort \Vayne, in the county of Allen and State of Indiana, have invented certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

This invention relates principally to focusing-lamps of that character in which the carbons are arranged vertically beneath the mechanism-case, the lower or negative carbon being carried in a vertically-sliding frame, whichis fed upward at half the speed at which the upper carbon is fed downward.

The preferred construction of my improved lamp is shown in the accompanying drawings, wherein- Figure 1 is a perspective view of the lamp, showing the globe lowered ready for trimming. Fig. 2 is a vertical mid-section of the lamp at the beginning of its operation, the feed mechanism being omitted. Fig. 3 is a horizontal section on the line 3 3 in Fig. 2. Fig. 4 is a perspective view of the portions peculiar to the focusing-lamp separated from the mechanism-case. Fig. 5 is an enlarged detail of Fig. 2. Fig. 6 is an enlarged sectional elevation showing one of the spindles of the focusing-gear in detail. Fig. 7 is a sectional elevation showing a suitable form of feed mechanism. Fig. 8is'a sectional elevation of the lower part of the lamp, showing the globe lowered for trimming. Fig. 9 is an elevation of the U-shaped frame carrying the negative carbon detached. Fig. 10 is an enlarged fragmentary elevation, and Fig. 11 is a cross-section of the feed-rod for the positive carbon.

Let A designate the mechanism-case, which may be of any usual construction, and let 13 indicate a U-shaped or drop frame depending therefrom for the double purpose of supporting the globe O and of guiding the frame which carries the negative carbon. 0

D is the positive carbon, and E the negative carbon. The positive carbonis carried in the usual way by a holder a, fixed on the lower end of a feed-rod F. This feed-rod is actuated by any usual feed mechanism located in the mechanism-case A. This mechanism is omitted in'Fig. 2, as it forms no novel part of my invention.

The negative carbon is held in a carbon-holder b and car ried by a verticallysliding U-shaped frame G. This frame G is shown separately in Fig. 9. It consists of parallel vertical rods 0 c, joined at their lower ends by ayoke d, in the middle of which the carbon-holder b is mounted. The frame G is suitably guided in its vertical sliding movements preferably by adapting the drop-frame B to act as a guide for it, although other means of guiding may be substituted. The upper ends of the side rods 0 c of the frame G may pass up into the mechanism-case A. v

For imparting the requisite feeding movements to the negative carbon the frame G is suitably geared to the feed-rod F. To this end the feed-rod F is geared or connected by any suitable mechanism to both parallel side bars 0 c of the frame G in such manner that the movements of the feed-rod are transmitted equally and simultaneously to both said side bars. By this means the weight of the lower carbon and its carrying-frame G is balanced and transmitted symmetrically to the feed-rod, so that there is no tendency to tilt or cant the sliding frame or bind the feed-rod. The gearing for this purpose may be variously arranged, but I prefer the system shown wherein the feed-rod F is formed with rack teeth 6 6, cut into it at opposite sides, meshing with gear wheels or pinions ff, fixed on obliquely-arranged horizontal shafts or spindles g 9, arranged in the manner clearly shown in Figs. 3 and 4, while on, the opposite ends of these spindles are formed pinions h h, hav ing approximately half the diameter of the pinions f and meshing with racks cut in the side bars 0 c of the frame G. The spindles g g are inclined, so that the pinion f shall en gage the feed-rod on one side of the axis, while the pinion it engages the frame G on the opposite side thereof, in order to reverse the di rection of feeding movement. It results'from this arrangement that the downward-feeding movement of the feed-rod F, which carries down the positive carbon, causes an upward feeding movement at half-speed ofthe two side bars 0 o, and hence of the negative carbon E.

I will now describe the details of construc tion which I prefer to employ.

Beneath the bottom plate 13 of the mcchau ism-ease is fastened a plate or casting H, (shown clearly in Fig. 4,) being insulated from the plate t' by a disk or ring j, of insulating material. The plate II is formed with a depression H, forming a chamber for inclosing the focusing-gearing, as clearly shown in Fig. 4. The plate II is formed on opposite sides with deep tubular bosses 70, into which are screwed two upright tubes Z Z, which form the side bars or members of the drop-frame B. In order that the drop-frame B may serve as the guide for the sliding frame G, its side bars Z Z are formed as tubes having a free fit with the bars or rods 0 c, which pass through them. In order to admit of the vertical movement of the yoke d, the tubes l are vertically slotted at their lower portions at Z. The lower ends of the tubes Z are closed by screw-plugs m, screwed into them, as shown in Fig. 5. 1nasmueh as the tubes are slotted entirely to their lower ends in order to admit the insertion of the frame G, it becomes necessary to provide some means for preventing spreading of their open or slotted ends, and for this purpose 1 construct the plugs m each with an upwardly-projecting flange m, having a coned inner face adapted when screwed up to draw in the lower end of the tube, which is preferably also coned. The plug m has a downwardly-projecting neck or stud m for attaching the ends of the yoke 02, which forms the bottom portion of the drop-frame B. It is desirable to insulate this yoke from the tubes Z Z,'whieh are not insulated from the negativecarbon holder, and to this end I interpose insulatin g-bushin gs between the plugs m m and yoke it. These details of construction are best shown in Fig. 5. The plate II and the side bars or tubes Z 1 form part of the negative circuit, and hence the feed-rod F requires to be insulated from the plate II, for which purpose and to guide and steady the lower end of the feed-rod I provide an insulated bushing 0, which is fastened beneath the plate H and insulated therefrom by an interposed insulating-washer. In constructing the frame G the lower ends of the rods or side bars 0 c are riveted into the ends of the cross-piece or yoke (Z.

In order to use a full-length carbon with out having the light too high in theglobe, the yokes n and d are made lower at the center than at the ends, as shown.

The plate II by reason of its depression 11 forms a dust-proof chamber for inclosin g the focusing-gearing and serves as a convenient mounting for such gearing. For each of the spindles g a bearing-boss Q) is provided at one end, while at the other a screw-plugp is provided, which, screwing into the plate II, as shown in Fig. 6, forms a bearing for the op posite end or journal of the spindle. By unscrewing or loosening the plugs 11 until the inner ends of the shafts are free from the bosses p the shafts can be lifted out. has much as the pinionsfare in metallic contact with the positive feed-rod F while the pinions 7t are in metallic contact with the side bars 0 of the negative frame, it is obvious that these respective pinions must be insulated from one another. This I preferably accomplish by interposing an insulating-bushingf, Fig. 6, of mica or other suitable material, between the pinionsf and the spindle g.

The globe C is fastened at its lower part to a globe-holder or cup g, which hooks upon the yoke n by means of hooks r, projecting up within the globe and hooking over this yoke by a quarter-turn, as heretofore constructed.

To lower the globe for trimming, it is only necessary to slightly lift the cup q, give it a quarter-turn backward to release the hooks r, and then lower it. Ileretofore the globe has usually been entirely removed from the lamp during trimming. My present construction, however, provides for suspending the globe during trimming in the position shown in Figs. 1 and 8. To this end I provide chains or other flexible connectors s s, fastened at their lower ends to the cup 1 and having rings or links at their upper ends which hook over hooks 751 formed on the yoke a. In raising the globe into position after trimming the chains .5 .9 simply fall into the hollow of the on p (1 out of the way. The globe is ventilated by a central aperture in the cup, as heretofore.

The mechanism-ease A is formed or inelosed in the usual manner by means of a sheetmetal cylindera, which is insulated from the plates 2' and II by the protrusion of the intervening insulating-disk j, which is made of larger diameter. The shellu has a downward prolongation a extending considerably beneath the plate II. A sheet-metal shell or hood '0 is arranged to form a downward continuation of the shell a and has an enlarged boss which when the lamp is in use rests against the upper part of the globe. In trimming the lamp, however, it is desirable to raise this shell r in order to enable the operator to more readily reach the positive-carbon clamp a, and to this end the shell v is made to telescope upon the portion a of the upper shell. To this end it is made to fit over it, and to limit its movement it has studs 0' at opposite sides, which work in long vertical slots at in the shell to. Fig. 1 shows the lower hood e raised for trimming. The upper shell 10 has a skirt 24 which passes outside of the upper edge of the shell a: in order to shed rain. Ventilation is provided for by means of holes near the base of the shell 1: and through the lower shell u, the air passing into the mechanismcase threugh holes y, Fig. 4-, in the plate H and escaping from the top by the usual open- 11] gs.

Although, as before stated, the particular kind or type of feed mechanism used is immaterial to my present invention, yet as an example of a suitable mechanism Ihave shown in Fig. 7 a feed mechanism of the clutch-feed type. J and K are regulatingmagnets or solenoids, the former being wound with coarse wire and connected serially, as the main mag: net, and the latter wound with fine wire and connected in a shunt around the are, as the shunt-magnet. They act oppositely upon the armature or solenoid core L, which is hung upon an armature-lever M, pivoted at l\! 'and receiving the tension of an adjustable retractile spring N. A link connects the lever M to the clutch-lever P, which carries the shoe P of the clutch, being pivoted to a clutch-sleeve Q, which is mounted to freely embrace the feed-rod F. The tail P of the clutch-lever is engaged by a stop B. When the shunt-magnet K draws down the armature-lever M, it lowers the clutch and rod until the tail of the clutch-lever is arrested at the stop R, whereupon any further downward movement opens the clutch and permits the feed-rod to slide through it. For a further description and illustration of a clutchfeed mechanism of this type I will refer to my Letters Patent No. 487,315, of December 6, 1892. It will be understood that the clutch sleeve Q and shoe P bear against the smooth portions of the rod F between the rack-teeth, so that the latter do not interfere with the action of the clutch. The feed-rod F feeds down by gravity when released, being made sufficient] y heavy so that, considering its advantage of leverage, it outweighs to a suitable extent the negative-carbon frame G.

In order to make good electrical connections with the feed-rod F and with the negative frame G, I provide the usual contacting spring y, mounted on the mechanism-frame and hearing at its free end upon the feed-rod F, and I provide similar springs y y, (shown in Figs. 3 and 6,) mounted within the chamber H of the plate II and bearing at their upper ends upon the vertical side rods 0 c.

It will be understood that my invention is not limited to the several details of. construction set forth and specifically that it is not limited. to the employment of any particular feed nor to the use of a clutch-feed, nor am I limited to the particular arrangement of focusin g-gearin g shown and described,although this arrangement is considered preferable.

I claim as my invention the following-defined novel features, substantially as hereinbefore specified, namely:

1. In a focusing arc-lamp, the combination of a feed-rod for the positive carbon formed with rack-teeth, a U-shaped sliding frame carrying the negative carbon, the legs of said frame formed as rack bars, and reducing spur-gearing interposed between said feedrod and said rack-bars for imparting feed movements to the negative carbon.

2. In a focusing arc-lamp, the combination of a feed-rod for the positive carbon formed with rack-teeth on opposite sides, a U shaped sliding frame carrying the negative carbon, its legs formed with rack-bars, and interposed 4. In a focusing arc-lamp, the combination of a mechanism-case, a feed-rod for the positive carbon, a U-shaped sliding frame carrying the negative carbon, gearing interposed between said feedrod and both legs of said frame, and a separate gear-chamber inclosing said gearing.

5. In a focusing arc-lamp, the combinationof a mechanism-case, a feed-rod for the positive carbon, a U-shaped sliding frame carrying the negative carbon, gearing interposed between said feed-rod and both legs of said frame, and achamber formed beneath the mechanism-case and inclosing said gearing.

6. In a focusing arc-lamp, the combination of a mechanism-case, a feed-rod for the positive carbon, a U-shaped sliding frame carry ing the negative carbon, gearing interposed between said feed-rod and both legs of said frame, and a chamber inclosing said gearing, said gearing comprising spindlesg g, and said chamber formed with bearing-lugs p p, and with opposite adjustable bearing-plugs p 19' for mounting said spindles.

7. In a focusing arc-lamp, the combination of a mechanism-case, an insulated plate fastened beneath said case, a drop-frame sup-' ported from said plate, a feed-rod for the positive carbon, a U-shaped slidingframe carrying the negative carbon, and gearing interposed between said feed-rod and sliding frame for imparting feed movements to the latter, and said insulated plate formed to constitute a chamber inclosing said gearing.

8. In a focusing arc-lamp, the combination of a mechanism-case, a drop-frame comprising parallel upright tubes Z Z having slots in their lower port-ions, plugs at closing the lower ends of said tubes and holding the sides of said tubes inward so as to prevent spreading, and a yoke 'n uniting said tubes and fastened to said plugs, and a U-shaped sliding frame for the negative carbon comprising side bars 0 c sliding in said tubes, and a bottom yoke d connecting their lower ends and moving in said slots.

9. In a focusing arc-lamp, the combination of a mechanism-case, a drop-frame compris ing parallel upright tubes Z Z having slots in their lower portions, screw-plugs m screwing into the bottom ends of said tubes and hav In witness whereof I have hereunto signed ing conical flanges m for preventing said my name inthe presence of two subscribing slotted ends from spreading, and a yoke n uniting said tubes and fastened to said plugs, witnesses. and a U-shaped sliding frame for the nega- JAMES J. WOOD. tive carbon comprising side bars 0 a sliding W'itnesses: in said tubes, and a bottom yoke 01 conneot- L. S. NOLD,

D. O. DAVIS.

ing their lower ends and moving in said slots.

Images