US501080A - Electric-arc lamp - Google Patents

Description

(No Model.) L

G. KIRKEGAARD.

ELECTRIC ARC LAMP.

No. 501,080. Patented July 11, 1893.

lNVENTOR Gem ffirkegaard WITNESSES:

ATTORNEY UNITED STATES PATENT OFFICE.

GEORG KIRKEGAARD, OF BROOKLYN, NEXV YORK.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 501,080, dated July 11, 1893.

Application filed November 12, 1892. Serial No. 451,753. (No model.)

1'0 00% whom it may concern.-

Be it known that I, GEoRo KIRKEGAARD, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Electric Arc Lamps, of which the following is a full, clear, and exact description.

This invention relates to electric arc lamps, the object being to produce a lamp which shall be simple in construction, adapted for incandescent circuits, and delicate and sensitive in its operation.

It is also the object of the invention to pro duce a carbon holder which shall be as compact and small as possible, and which will permit of the alignment of the carbons after they have been clamped by the holder.

A means for securing the globe to the lamp is also a feature of the invention.

The feeding and regulating mechanism of the lamp is an improvement upon that described in my applicati0n,Serial No. 432,831, filed May 13, 1892.

In the accompanying drawings, which illustrate my invention, Figure 1 is a side elevation of the complete lamp, the globe and lamp casing being shown in section. Figs. 2 and 3 are details of two slightly different constructions of carbon holders.

Referring to the drawings by letter, A represents the lamp casing and A, A, the side rods supporting the lower carbon and globe.

In the lamp casing are fixed two standards a, in which is pivoted at the point a a rectangular frame a The pivot of this frame, as shown, is located near one end and to the short end of the frame is attached a spring a which is adjustable by means of a screw a. In this frame is mounted a train of gear wheels engaging at one end with a winding drum a and at the other end with an escapement a, the escapement being controlled by an oscillating wheel a This wheel carries a downwardly projecting finger a having a right angled projection at its extremity for a purpose which will hereinafter appear. At the point b in the standards a is pivoted a lever b. The pivotal point of the lever is about midway of its extremities. The lever is connected at one end through a link b with the core of a solenoid 0, located in the shunt circuit of the lamp. The opposite end of said lever is provided with a detent Z2 which stands adjacent to the right angled portion of the finger a connected with the escapement.

c is a link pivoted at one end to the lever 19 close to its fulcrum and pivoted at the other end to the outer or free end of the frame (1, This system of levers when moved by either the magnet O or the spring a is such that the detent will have a wide range of movement in comparison with the movement of the train of wheels. In other words, the slightest movement of the levers will considerably affect the detent without materially affecting the train.

The winding drum carries a cord d which passes over a guide pulley d and through a hole in the floor of the casing to the upper carbon holder E. The winding drum is also provided with a spring 61 shown in dotted lines, which is strong enough only to take up slack in the cord. This cord, if desired,may be metallic and form a portion of the circuit conducting the current to the upper carbon pencil.

The upper carbon holder E is supportedin a crosshead e, the extremities of which are formed into curved seats which partially embrace the side rods A of the lamp. This cross-head is free to slide up and down upon the side rods as guides. The carbon holder consists of a casting 6' having a cup-shaped seat or socket on its under side; a hollow ball 8 adapted to rest in said seat and a ring 6 pivoted to one side of the casting e, and at the opposite side provided with a screw e which Works in a small hub formed in the casting. The ball is open on its lower side, and is also slit vertically at three or more points to form spring jaws. The upper end of the carbonis passed into the ball and is clamped therein by turning the screw 6 The screw forces the ring against the spherical sides of the ball and pushes the jaws together upon the carbon. At the same time the ball is bodily forced against the cup shaped socket in the casting, so that it is held sufficiently tightby friction, but is still capable of being rolled in the seat and in the ring by moving the carbon pencil. In this way, after the carbon has been set it may be adjusted into alignment with the lower carbon; the carbon is removed by simply loosening the screw. This holder may be made about one-half the length of the ordinary holders now in use; and it provides for burning the lamp about an hour longer than usual without trimming. A slight modification of this holder is shown in Fig. 3. A thread is cut on the outside of the casting c and the ring is provided with a cylindrically threaded portion which screws up and down thereon. This is simply amodification in the means for tightening and releasing the spring jaws on the ball. This form of holder is well adapted forthe lower carbon.

F represents the lamp globe. It is open at the top and closed at the bottom and is provided at its open end with a metallic band f which, at two opposite points, carries metallic clips f which bend over the edge of the globe and point downward inside. The ends of these clips are curved, so that they will fit partially around the side rods of the lamp. The side rods A are provided with two notches attheir upper ends with which these clips are adapted to engage and supportthe globe. As the ends of the clips are curved, the globe will be prevented from rotating. The clips are also provided with handles f which stand in a horizontal plane tangent to the curve of the clip; to lower the globe these are grasped in the hands and the globe lifted slightly, which will bend the clips free of the notches and allow the globe to be lowered until the clips strike the frame 9 connecting the lower ends of the rods, where they may be left while the lamp is being trimmed, or, if desired, by again releasing the clips, the globe may be entirely removed. WVhen the lamp is not burning the carbons are separated. hen the current is turned on magnet O, which is in the shunt circuit, pulls down on the lever 19 thus removing the detent from the path of the escapement and releasing the train of wheels. The upper carbon, by its weight,

then feeds downward until the carbons come together, when, immediately, the magnet becomes very much weaker and spring c acting in opposition thereto, swings the frame a thus lifting the train of wheels bodily and also carrying upward the carbon pencil and establishing the are. This movement of the frame a simultaneously locks the escapement, so that the drum cannot turn when the frame is lifted. When the resistance of the arc becomes too great, the magnet 0 becomes stronger and releases the escapement allowing the drum to unwind a short portion of the cord.

It will be observed that the ordinary carbon rod provided with a rack to engage with a wheel of the train, may be substituted for the winding drum and cord. It will also be understood that in place of a solenoid I may use an electro-magnet acting upon an armature carried at the end of the lever b.

What I claim as my invention is 1. In an arc lamp, the combination, of a pivoted frame carrying a train of wheels geared to the carbon carrier, a detent for said train of wheels, a pivoted lever operating said detent, a link or other device connecting the frame and the lever at such a point that a movement of the detent will be greater than the simultaneous movement of the frame, an electro-magnet and a spring, respectively connected with the lever and frame, and acting in opposition thereupon, substantially as and for the purpose described.

2. The combination, of the cup-shaped socket, the hollow ball resting therein, said ball being slit to form spring jaws, the ring surrounding said jaws and bearing against the sides of the ball, said ring being hinged to the socket and a screw engaging the ringaud working into the socket whereby the ring may be forced against the ball for the purpose set forth.

In testimony whereof I subscribe my signature in presence of two witnesses.

GEORG KIRKEGAARD.

lVit-nesses:

WM. A. ROSENBAUM, Jos. J. UHL.

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