US274916A - allan dalzell - Google Patents

Description

(No Model.)

J. A. DALZELL.

IELEGTRIO ARG LAMP. No. 274,916. Patented Apr.3, 1883.

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7 UNITED STATES PATENT OFFICE.

J. ALLAN DALZ'ELL, on NEW YORK, N. Y.

ELECTRIC-ARC LAMP.

SPECIFICATION formingpart of Letters Patent No. 274,916, dated April 3, 1883.

Application filed March 25. 1882. (No model.)

To all whom it may concern Be it known that I, J. ALLAN DALZELL, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electric Lamps, of which the following is a specification.

My invention relates to that class of lamps known as arc-lamps, and the object of the invention is to make the magnet system by which the feed of the carbon is controlled more delicate and sensitive in its action.

My invention consists in the combination, with the lifting or actuating devices for the teed mechanism, of an electro-niagnet composed of two movable spools or helices, with their contained cores connected by a bridgepiece, which is pivoted at its middle, said electro-magnet being arranged with relation to the other parts in the special manner hereinafter set forth.

My invention also consists of certain coinbinations of parts that will be specified in the claims.

Figure 1 is a side view of the operative portions of a lamp embodying my invention. Fig. 2 is a top view of the lamp. Fig. 3 is a top view of the clutch. Fig. 4 is an end view of one of the spools or bobbins and its contained core, showing the form of thepole-piece of the core. Fig. 5 shows the link by which the piston'rod of the dash-pot is hung from the core of an electro-inagnet. Figs. 6, 'i, and 8 show modified forms of clutch.

Referring to Figs. 1 and 2, A represents the base-plate of the lamp, and F a vertical plate, mounted upon the base-plate, and serving as a means of support for the main circuit spools or helices G G, the cores of which are secured directly to the plate F and project horizontally therefrom. The helices G G are wound so that the projecting end of the core for one spool is north while that of the other is south. The plate F is by preference of iron, so that the cores of the two spools or helices F F are magnetically connected, and form virtually the poles of a horseshoe electro-magnet.

E E are two supporting plates or rods, one of which is connected to the base-plateA,and the other by preference to the upper portion of the plate F. The plates E are connected at their upper ends in any ordinary or suitable manner to the parts by which the lamp is supported.

H H are bobbins in a derived circuit around the carbons of the lamp. Said bobbins are wound in such a way, or their ends are so connected to the general circuit, that the current circulating in them tends to depolarize their cores, or, in "other words, to impart to said cores a polarity the opposite of that which is induced in them owing to their proximity to the ends of the coresofG G. Thecores of the spools G G are. screwed to a bridge-piece of iron, N, after the manner ordinarily employed in construct i ng horseshoe electro-magnets, and the bridge-piece N is attached atits center to a horizontal rock-bar, K, pivoted in plate F, and the plate E opposite thereto. readily seen, when the electro-magnet is thus constructed and mounted, its weight is halanced about a central point, so that it will act with great seusitiveness and rapidity in obedience to the changes of magnetic condition of its core and ot' the opposite or attracting magnet. The rock-shaft K is curved at its central portion, so as to make room for the carbon-carrier B, and to also form a crankarm from which is hung the link L, which supports and impart-s movement to the clutch. The pole-pieces oi the bobbins G and H have the form shown in Fig. 4, where M represents apole extension projectiugat right anglesfro n the longitudinal axis of each core.

When the lamp is not in action, the bobbins H H are out of line with the bobbins G G, as indicated in Fig. 1, so that when the cores are magnetized the bobbins H H are carried to.- ward the horizontal linejoiuiug the magnetic axis of the bobbins G G, thus causing the bar K to rock and lift the link L and connected clutch. Owing to the pole extensions M, and t0 the manner in which the bobbins and their cores are presented and move with relation to one another, great range of movement is obtained, and a consequent increased delicacy of action ensues.

G is the clutch-lever, resting at one end upon the base-plate A by an adjusting-screw, and connected at its other end to the link L.

The clutch proper consists of a projection from lever O, which enters a slot or groove in As will be ICO the side of the carbon rod or carrier B, and is so formed that when the'lever is lifted at one end the clutch is turned slightly, and its two diagonally-opposite edges will be caused to engage with the two sides of the groove or slot, and thus stop the movement downward of the carrier, or hit the carrier it the lever be moved still farther.

Fig. 6 shows another clutch device differing but slightlyin form from that shown in Fig. i). Fig. 7 shows a form in which two clutching projections enter slots or grooves in opposite sides of the rod. These clutches, like that already described, are suitably mounted upon a swinging lever or other device, so that when they are operated they will bind against the sides or edges of the groove in the carrier in substantially the same manner as the clutch upon lever U. Fig. 8 is an equivalent form, in which a web or projection formed upon the side of the carbon-carrier enters a bend in the clutch-lever. In all these forms, as will be readily seen, the carbon-carrier is prevented from turning about its horizontal axis.

The dash-pot is represented at R. Its piston-rod is actuated by a link, S, which is attached to a pole projection of the core of one of the bobbins G.

The general operation of a lamp thus constructed does not differ materially from that of other well-known forms, in which main and derived circuit helices are employed. When no current is passing, the derived-circuit electro-magnet H H N and its connected parts are caused by a spring, P, to assume a position in which the clutch D does not engage with the groove in the carbon-carrier, so that said carrier is free to drop until the carbons are in contact. When the current flows, the derivedcircuit magnet H H N swings, tilting the lever 0, and causing the clutch to engage with and lift the carbon-carrier. When the arc lengthens, more current flows in the derivedcircuit helices, thus tending to depolarize their core and lessen the mutual attractions of the main and derived circuit cores, so that the re tractor carries the parts into a position where the clutch will release its hold and allow the carbon-carrier to move downward to compensate for combustion.

It is obvious that the construction of the clutch or feed-controlling mechanism D may be varied without departing from the invention.

It is also obvious that the bridge-piece N might'be of some non-magnetic material, in which case there would be two straightbar eleetro-magnets instead of a horseshoe-magnet; but the weight of the parts would still be balanced, as before.

Instead of balancing the parts of the dcrivcd-circuit electro-magnet and making them movable, I may mount them so that they will be stationary, and make the main-circuit magnet movable instead.

The connecting or bridge piece N might be curved instead of straight, and integral or of one piece with the cores of the bobbins G G.

The connections of the main and derived circuit helices are made in any of the wellknown ways.

It is obvious that the arrangement and method herein described of mounting the electro magnets may be applied to lamps employing other forms of feed-controlling mechanism in place of the clutch devices described.

What I claim as my invention is- 1. The combination of the horizontal fixed bobbins G G, the horizontal movable bobbins H H, arranged to swing past or transversely to the magnetic axes of bobbins G G, the cross-piece or bridge N, pivoted at its center, and carrying atits ends the bobbins H H, projecting transversely therefrom toward the parallel fixed bobbins G G, and means for actuating the clutch mechanism of the lamp.

2. The combination of the horizontal fixed bobbins G G, provided with vertical polar projections, the parallel movable bobbins G G projecting at right angles from the cross-piece N, the rock-shaft K, the link L, connected to the rock-shaft, and the tilting-lever carrying a clutching projection arranged to engage with the two sides of a groove in the carbon-carrier.

3. The combination of the horizontally-projecting fixed bobbins, polar projections for the cores of said bobbins extending at right angles to their magnetic axes, movable bobbins whose cores are provided with similar polar projections, asupporting crossbar or bridgepiece, by which said bobbins are connected, pivoted at its center, so that the weights of said bobbins are balanced, and means for actu ating the clamp or equivalent devices of an electric lamp.

J. ALLAN DALZELL.

Witnesses:

H. G. TOWNSEND, Tnos. TOOMEY.

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