US769842A

US769842A - Electric-arc lamp.

Info

Publication number: US769842A
Application number: US17505403A
Authority: US
Inventors: Frederik Sindingchristensen
Original assignee: Individual
Current assignee: Individual
Priority date: 1903-09-29
Filing date: 1903-09-29
Publication date: 1904-09-13
Anticipated expiration: 1921-09-13

Description

No. 769,842. PATENTED SEPT. 13, 1904. F. SINDINGOHRISTENSEN. ELECTRIC ARC LAMP.

APPLICATION FILED SEPT. 29, 1903. v NO MODEL. G 2 SHEETS-SHEET l. H I

F|G.l.

I I 71? S (/7 V U K WITNESSES: I |NVENTOR ATTORNEY UNITED STATES Patented September 13, 1904,

PATENT OFFICE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 769,842, dated September 13, 1904.

Application filed September 29, 1903. Serial No. 175,054. (No model.)

T0 11 whom it rnney concern:

Be it known that I, FREDERIK SINDING- CHRISTENSEN, a subject of the King of Denmark, residing at New York city, borough of Brooklyn, county of Kings, State of New York, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.

Electric-arc lamps in their simplest form are provided with two carbons, which are usually arranged vertically in the same axial line, and one of said carbons adapted to be moved relatively to the other to strike and maintain the arc.

In my improved arc-lamp two verticallydisposed carbons are employed, each disposed at an angle to the other and adjustable as regards each other, or, preferably, two vertically-disposed angularly-arranged and relatively-adjustable carbons and a third vertically disposed fixed carbon or other body which may be rendered incandescent situated between the angularly-arranged adjustable carbons.

The objects of my invention are to decrease the cost of construction, prevent vibration of the carbons and mechanism where an alternating current is employed, do away with the objectionable shadow caused by the usual lower carbon, and where two carbons and a body which may be rendered incandescent are employed increase the light-giving power of the lamp.

In an arc-lamp employing two carbons the effective light is due to the are formed between the two carbons. In my improved arclamp where two carbons and a body which may be rendered incandescent are employed the efiective light is due to the are formed between the angularly disposed adjustable carbons and to the incandescence of the third carbon or other body.

The accompanying drawings show my invention as embodied in an alternating arclamp employing three carbons.

Figure l is a vertical section on the line 1 l of Fig. 2 with the controlling-magnet connected in shunt. Fig. 2 is a plan view. Fig. 3 is a side View, looking from the left, of the top of the lamp. Fig. 4. is a vertical section on the line 4 i of Fig. 2. Fig. 5 is a section corresponding to Fig. 4 with the controllingmagnet arranged for a series connection.

In the drawings, A represents the base-plate of the lamp. Suitably supported above the base-plate is a controlling-magnet B. This magnet in Figs. 1 to 4 is shown as connected in shunt with the leads C D and in Fig. 5 for connection in series with the leads C D.

Pivotally mounted in brackets E, depending from opposite sides of the magnet B, Fig. l, or at the ends of a horizontal arm F, carried by a bracket G, projecting upward from the top of the magnet B, are the armatures H I. Secured to the lower curved ends of the armatures H I and angularly disposed as regards each other are the carbon-holders J K. Carried in these carbon-holders are the carbons L M.

Depending from the bracket Gr, situated above the magnet B, is a rod N, to the lower end of which is connected a third holder, 0, carrying a carbon or other body P, which may be rendered incandescent. Projecting horizontally from the top of the rod N, Fig. 1, are stops Q, which serve to limit the inward movement of the armatures H I.

Pivotally connected to each of the carbonholders J K are the air dash-pots R S, which serve to retard the movement of the armature H I. The carbon-holders J K are respectively connected in shunt, Figs. 1, 2, 3, and 4., (in series, Fig. 5,) with the leads C D through the contact-plates T. The rod N, holder 0, and body P are not connected in the lamp-circuit.

Depending from the base of the lamp is a threaded annulus U, which coacts with a similar annulus V, which serves as a support for the oblong inclosing globe WV. The operating mechanism on the top of the lamp is covered by a casing X. The lamp is supported by means of a pivoted bail Y.

The operation of the lamp will be readily understood.

In the construction shown in Fig. 1 the carbons L M, the lamp being a shunt-lamp, are

normally separated. When a current is turned on to the lamp, the armatures H I are uniformly magnetized and repel each other, thereby drawing the lower end of the carbons toward each other and into contact with the third carbon or other slightly conductive body which may be rendered incandescent to strike the arc. WV hen the arc is struck, a portion of the current is diverted from the magnet B, which partially demagnetizes the armatures H I and permits them to approach each other, thus regulating the distance between the carbons L M as the carbons are consumed.

In the construction shown in Fig. 5 the carbons L M are normally in contact, and'when the current is sent through the magnet B the armatures H I, as in the case of the shuntlamp, repel each other, but, owing to their having a different pivotal position, serve to draw the carbons L M apart, and thus strike the arc. When the arc isformed, the current sent through the magnet B is decreased, the armatures H I partially demagnetized, which allows them to approach each other as before, and thus regulate the distance between the carbons as the carbons are consumed. When the arc is formed between the carbons L M, the body P is heated, rendered incandescent, and its conductivity increased. The body P when rendered incandescent radiates light and also serves, by reason of the conductivity of the body, to decrease the resistance between the carbons L M, and thus aid in the regulation of the lamp, and, further, by reason of the light emitted from the incandescence of the body P, to in a measure regulate, or, in other words, cover, the variations in light emitted from the are between the carbons L M and due to their relative movement in feeding.

I wish to have it understood that my improved arc-lamp may be used with but two carbons or two carbons and a body which may be rendered incandescentsuch, for instance, as carbon, carbon and clay, metal and clay, slightly conductive material composed of the refractory earths, such as thorium cerium, &c.and, further, that the mechanism shown and described for effecting the relative movement of the carbons L M may be varied without departing from the intent of my invention.

Having thus described my invention, I claim" 1. An electric-arc lamp embodying in its construction, a solenoidal magnet, a pair of armatures situated and movable within the cavity of said solenoid, and a pair of carbons carried by said armatures and angularly disposed as regards each other.

2. An electric-arc lamp embodying in its construction, a solenoidal magnet, apair of armatures situated within the cavity of said solenoid, but pivoted exterior thereto, and a pair of carbons carried by said armatures and angularly disposed as regards each other.

3. An electric-arc lamp embodying in its construction, a solenoidal magnet, having its tubular cavity arranged vertically, a pair of armatures situated in said tubular cavity, and a pair of carbons carried by said armatures and angularly disposed as regards each other.

4. An electric-arc lamp embodying in its construction, a solenoidal magnet having its tubular cavity arranged vertically, a rod and a pair of pivoted armatures situated in said tubular cavity, and a pair of carbons carried by said armatures and angularly disposed as regards each other.

5. An electric-arc lamp embodying in its construction, a solenoidal magnet, a bracket situated over the magnet, a rod or holder clepending from the bracket, a pair of movable armatures arranged on each side of the rod or holder, and within the cavity of the solenoid, and a pair of angularly-disposed carbons carried by said armatures.

6. An electric-arc lamp embodying in its construction, a solenoid, a bracket arranged over the cavity of the'solenoid, a rod or holder depending from said bracket, a pair of armatures one on each side of said rod or holder, and pivoted exterior to the magnet, carbonholders depending from said armatures, and carbonsin said holders.

7 An electric-arc lamp embodying in its construction, a solenoidal magnet, a bracket over the magnet, a holder depending from the bracket, a fusible body carried by said holder, a pair of armatures on each side of said holder and pivoted exterior to said solenoid, a holder carried by each armature, and a carbon carried by each holder.

8. An electric-arc lamp embodying in its construction, a solenoidal magnet, a bracket over the magnet, a holder carried by the bracket,insulated stops mounted on the holder, a pair of armatures on each side of said holder and pivoted exterior to the solenoid, a holder carried by each armature, and a carbon carried by each holder.

9. An electric-arc lamp embodying in its construction, a solenoidal magnet, a pair of armatures situated and movable within the cavity of said solenoid, a pair of carbons carried by said armatures and angularly disposed as regards each other, and a fusible body situated between said carbons.

10. An electric-arc lamp embodying in its construction, a solenoidal magnet, a pair of armatures situated and movable within the cavity of said solenoid, a pair of-carbons carried by said armatures and angularly disposed as regards each other, and a third carbon body interposed between said carbons.

11. An electric-arc lamp embodying in its construction, a solenoidal magnet, a pair of pivoted armatures mounted in the interior of the magnet, carbon-holders carried by said armatures, carbons in said carbon-holders, and

III

means for checking the movement of the arfor dampening the movement of said arma- Inatures. tures.

12. An electric-arc lamp embodying in its In testimony WhereofI afiix my signature in construction, asolenoidal magnet, a pair of arthe presence of two Witnesses.

5 matures Within said magnet, means for limit- FREDERIK SINDINGOHRISTENSEN.

ing the inward movement of the upper ends of Witnesses: said armatures, a pair of carbons mounted on J. E. PEARSON, the lower ends of said armatures, and means FRANK OCoNNoR.