US254055A - George w - Google Patents

Description

(No Model.)

G. W. SAWYER.

ELECTRIC LAMP.

No. 254,055. Patented Feb. 21,1882.

C l a jnvenzor.

N. PETERS. Phulo-Lllhugmphcr, Washington. 1;).(2v

UNITED STATES PATENT OFFICE.

GEORGE \V. SAVYER, OF NE\V YORK, N. Y., ASSIGNOR TO BERNARD LANDE, OF SAME PLACE.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 254,055, dated February 21, 18853.

Application filed November 29, 1881.

To all whom it may concern:

Be it known that. I, GEORGE W. SAWYER, of New York, county and State of New York, have invented certain new and useful improvements in Electric Lamps, of which the following is a specification.

This invention relates to electric-arc lamps, and has for its object to make a simple and reliable feeding device, not liable to derange- IO ment, for raising the upper carbon to form the are between the points of the carbons, and to allow the same to gradually feed down as the carbons are consumed.

Thisinvcntion consists oftwo grooved pulleys fixed in yokes depending in brackets from the lowersideoi'theelectro magneticdevice. These grooved pulleys have the upper-carbon rod between them, and are held thereto by means of springs so adjusted as regards strength that the carbon rod will fall down freely by its own weight, turning the pulleys as it so descends, butis held between the pulleys when they are prevented from turning. Two brake-armsprojccting downward from the moving core or armature of the electromagneticdevice partly surround the grooved pulleys. These brakearms are brought in contact'with the pulleys when the moving core or armature first commences to rise, and so look them by friction,

0 and then the pulleys, with the carbon rod, move up with the moving core or armature to form the are between the carbon rods. As the earbons consume, the magnetic action of the current passing through the electro-magnet weak- 5 ens, the armature with the brakearms falls and releases the pulleys, and so allows them to turn and the upper carbon to approach the lower one. Said falling of the upper carbon is instantly arrested by the brake-arms when the 40 are is of normal length. By this arrangement it will be seen that the upper-carbon rod falls with a perfectly steady uniform motion, and is in no wise bruised or marred by the grooved pulley, so the liability of the clamping device becominginoperative is reduced to a minimum.

The invention also consists in certain improvements in the electro-magnet, which will be fully understood from the following description of the accompanying drawings, to which (No model.)

I will now refer to more fully describe my invention.

Figure l is a vertical section of an electric lamp embracing my improvements, showing the are formed between the carbon rods. Fig. 2 is a full front view of the clamping and feed- 5 ing device and its actuating electro-magnets, showing the feeding device frcc. Fig. 8 is a vertical section of the same cut through the line a; a0, and Fig. 4 is a horizontal section cut through the line y y.

The electro-magnetconsists ofthetwohelices a a, the upper ends of which are secured to the bar I) of the frame, made of insulating material, or to the iron plate 0, which is secured to the bar I), and which has two short cores, c c, fitting for a short distance down into the helices a a. Two other cores, (Z d, fit loosely in the helices a a, and are connected together by the bar (1', fitted to slide freely on brackets c 6, connected to the lower heads of the helices a a. The upper-carbon rod f passes through holes in the bar 1), plate 0, and bar (1. The electric current enters the lamp by the bindingpost g, passes through the two helices a and a, down by the flexible wire 9, to the lower end of the carbon rod f, and down the carhon h, carried thereby, and the lower carbon,

h, carried by the bar 7L2, of insulating material, up the side bar, 1 of the frame, and out of the lamp by the binding-post j. The elec- 8o tric current passing through the helices a and a causes the cores d (l to approach the fixed short cores 0 0, so that this electromagnetic device is a combination of a horseshoe electro-inagnet and axial magnet, and by this arrangement I have the long movement of axial cores with the advantage of the more powerful attraction of magnets of the horseshoe form.

Passing through holes in the brackets c e are the necks of the yokes L, the upper ends of which are provided with light springs It" It, to insure the yokes falling down, their limit of downward movement being governed by the ends of slots in their sides coming in contact 5 with the small screws 0 c in the brackets e c.

In the bifurcated ends of these yokes 7c 7c are pivoted the pulleys l 1, ground to fit the carbon rod f, and these pulleys Z Zare pressed against the rodf by means of the springs m m, tending to draw them together, the yokes 7c it being loosely fitted in the brackets e e, to allow of a slight movement of the yokes and pulleys Z Z.

Connected to the bar (1, joining the cores d (Z, are the two brake-arms n at, extending downward and partly surrounding the pulleys Z Z. These brakearms are away from the pulleys when the cores (Z (Z are in their lowest position so that the pulleys are free to be rotated by the falling of the carbon rod f, the tension of the springs m at being such as to cause the pulleys Z Z to rotate when the carbon rod f moves longitudinally, and to hold the rod between them by friction when their rotation is prevented, which occurs as soon as the brake-arms not come in contact with them upon the cores (Z (Z being attracted within the helices (Z and a. The pulleys Z Z and the rod fare then raised up theextent of such upward movement, which forms the are, this move ment being governed by the set-screws 00, passing through the bard and butting against the heads of the helices (Z a. Instead of only two pulleys Z Z and their supporting-yokes and brakes, three or more may be arranged around the rodf, such a modification being easily arranged by any skilled mechanic; so a further description here of the same is unnecessary.

It is obvious that other forms of actuating electro-magnets may be used in combination with this improved carbonaod clamping and feedingdevice. For instance, the plate 0, with short cores 0 0, may be removed, leaving the magnet, as shown, an axial magnet of horseshoe form; or a single straight hollow-core axial magnet or an ordinary horseshoe-magnet with moving armatures may be used.

It is also evident that any of the forms of electro-magnets having two or more coils of wire connected upon the differential principle may be used; so Ido notwish to confine myself to the combination of the particular form of electro-magnet here shown with the carbon-rod clamping and feeding device; but

What I claim, and desire to secure by Letters Patent, is-

1. An electric-arc-lamp regulator composed of the followinginstrumentalities in combination: friction guide-pulleys embracing the upper-carbon-holding rod, and the moving core or armature of an electro -magnetic device provided with brake irms adapted to prevent the rotation of the guide-pulleys and raise them with the carbon-holding rod clamped between them, when the core or armature is acted on by induction from the electric current passing through the coils of the electroamtguctic device substantially as set forth.

2. In combination with the moving core or armature of an electromagnet, the brake-arms a 12, pulleys ,Z Z, fitted in verticallyslidin g bearings, and the carbon rod f, substantially as and for the purpose hercinbeforc set forth.

3. In combination, the rodf,pnllcys Z Z, yokes k Ir, having slotted necks, brackets c 0, having set-screws c c, and brake-arms a a, connected to bar (1 of the moving cores (Z (Z, substantially as set forth.

4. The electro-magnetic device composed of the helices a, fixed connected cores 0 c, and movable connected cores (Z (Z, in combination with the brake-armsn a, pulleys ZZ, yokes k 7:, and carbon rod f, substantially as set forth.

In testimony whereof I have hereunto set my hand, at New York, county and State of New York, this 26th day of November, A.D. 1881.

' GEO. W. SAWYER.

Witnesses:

JOHN D. SHEDLOCK, H. D. WILLIAMS.

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