US1225194A

US1225194A - Arc-light electrode.

Info

Publication number: US1225194A
Application number: US73465612A
Authority: US
Inventors: Robert P Walker
Original assignee: Nat Carbon Co
Current assignee: National Carbon Co Inc
Priority date: 1912-12-03
Filing date: 1912-12-03
Publication date: 1917-05-08
Anticipated expiration: 1934-05-08

Description

R. P. WALKER.

ARC LIGHT ELECTRODE.

APPLICATION FILED DEC.3. I912.

l mnm May 8,1917

WETNESSES HNYENTOR HOBEF'RT F. ENALWEFK BY O 0 m dfifl/ww a ATTORNEY RQBERT I.

WALKER, 0F CLEVELAND, OHIO, ASSIG'NOR T0 PANY, 0F CLEVELAND, OHIO, A CORPQRATION OF NEW JERSEY.

ABC-LIGHT ELECTRODE.

Specification of Letters Patent.

Patented May 8, 191?.

Application filed December a, 1912. serial to. 784,656.

To all whom it may concern:

Be it known that I, ROBERT P. WALKER, a. citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Arc-Light Electrodes, of which the following is a full, clear, and exact description.

My invention relates to a novel way of arranging the end of the conducting wire in cored carbons.

Cored carbons have a sistance and to overcome this objection it is the common practice to extend a brass, zinc or other metal wire throughout the length of the carbon. Such a low resistance conductor is disclosed in Patents 982,407 and 1,000,717. In the former the wire is bent at right angles to lie across the end of the core. In the latter the wire is flattened and bent down over the side of the electrode.

In making electrodes in accordance with these prior patents the wire was first inserted in the channel, clipped ofi and bent acrom the core or flattened and bent down the side of the electrode. The core composition was afterward forced into the core opening. On account of the bent end of the wire being in the way, the composition was forced in from the other end of the electrode. The material, however, sometimes forced the wire outward when admitted from the arc end of the electrode. The bent end also furnishes too little surface contact as it is necessarily short. In addition it is diflicult to electroplate and solder the wire to the core. When the wire was flattened it often broke and destroyed the continuity of the circuit. My improvement overcomes these objectionable features in a manner set forth in the following description.

In the drawings: Figure 1 is an end view of an electrode with my improvement.

Fig. 2 is a sectional view of the electrode end taken on the line A-A of Fig. 1.

The electrode has a carbonaceous shell 1 and a central hole 2 extending throughout its entire length. A small channel 3 runs parallel to the, hole 2 and communicates relatively high retherewith through a slot 4:. In some forms of electrodes the channel 3 does not open into the central. hole. The wire 5 has one end bent in the form of a ring 6. This ring is preferably of larger diameter than the hole 2 so that the core composition 7 can be forced into or out of the hole without meeting any interference from the ring. After the wire is put in place the composition 15 forced into the hole from either end of the electrode. It also enters the channel 3 through the slot at and envelops the Wire 5. Afterward the core 7 is compressed by pressing a leaving usually a space at the holder end as shown, though this may be dispensed with if desired. However, it has been found advantageous to compress the compositlon in this way and the ring permits of this being readily done.

The electrode is afterward heated to dry the core and the and dipped in solder to integrally unite the ring to the carbon shell. The electroplate and solder is shown at 8.

When the wire is bent around to lie on the end of the shell the area of contact is greatly increased between the ring and coat of solder. The current can therefore flow from the holder through the solder and wire without undue generation of heat. The rlng itself in abutting against the bottom of the holder also furnished an increase in contact surface therebetween.

Having described my invention what I claim is:

An arc lamp electrode having two longitudinal channels,- flaming materlal in one of said channels and a metallic conductor in the other channel, the protruding end of said conductor being looped around the core of fiagring material and secured to the electrode on In testimony whereof, I hereunto aflix my signature.

THnonoRE I-IELMs, L. 0. Bnoons.

NATIUNAL CBUN COM- small rod through the ring 6 holder end is electroplated