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Title: US5239162: Arc plasma torch having tapered-bore electrode
[ Derwent Title ]

Country: US United States of America

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7 pages

Inventor: Haun, Rob E.; Ukiah, CA
Elmer, Neil C.; Potter Valley, CA
Lampson, Robin A.; Ukiah, CA

Assignee: Retech, Inc., Ukiah, CA
other patents from RETECH, INC. (472715) (approx. 20)
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Published / Filed: 1993-08-24 / 1992-01-30

Application Number: US1992000828385

IPC Code: Advanced: B23K 10/00; F27D 11/08; H05H 1/34;
IPC-7: B23K 9/00;

ECLA Code: H05H1/34; T05H1/34T; T05H1/34T18; T05H1/34T28; T05H1/34T32;

U.S. Class: Current: 219/121.52; 219/119; 219/121.51; 219/121.59;
Original: 219/121.52; 219/121.51; 219/121.59; 219/119;

Field of Search: 219/121.52,121.5,121.51,121.48,121.36,75,119

Priority Number:
1992-01-30  US1992000828385

Abstract: An arc plasma torch having a tapered-bore electrode provides a long, columnar plasma arc. The torch includes a torch housing, a tapered-bore electrode, a gas-constricting nozzle, and a swirling gas flow generator. The electrode is mounted within the housing and has a closed inner end and an open outer mouth. The electrode has a longitudinally extending, tapered bore. The bore has its largest dimension at the mouth. The nozzle has a bore and is also mounted within the housing. The nozzle is in axial alignment with, forwardly spaced with respect to and insulated from, the tapered-bore electrode. The torch introduces a swirling flow of gas at a location intermediate the electrode and the gas-constricting nozzle, resulting in gas flowing past the electrode during use of the torch. In operation, an electric arc emanating from the electrode ionizes the gas flow.

Attorney, Agent or Firm: Townsend and Townsend Khourie and Crew ;

Primary / Asst. Examiners: Paschall, Mark H.;

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Designated Country: CH DE FR GB IT LI SE 

Family: Show 12 known family members

First Claim:
Show all 7 claims
What is claimed is:     1. A swirl flow arc plasma torch for producing a long plasma arc comprising:
  • a torch housing;
  • an electrode mounted within said housing, having a longitudinally extending axial bore closed at one end and open at another end, a part of the bore adjacent the open end being uniformly tapered, the bore having a diameter at the open end being larger than a diameter of the bore spaced further from the open end, the bore having a length at least twice the diameter at the open end;
  • a nozzle mounted within the housing forwardly of and spaced from the electrode having an opening in axial alignment with the tapered bore, and means for injecting a gas in swirling fashion between the electrode and the nozzle for generating a swirling gas flow through the nozzle opening during use of the torch; and
  • means for generating an electric arc between an interior portion of the tapered electrode bore and a workpiece located on an end of the nozzle remote from the electrode;
  • whereby the swirling gas flow rotates the electric arc coaxially with the tapered electrode bore and the nozzle opening and thereby spins an arc termination point inside the tapered bore about an axis of the bore.

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Description: Show description

Forward References: Show 8 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (8)   |   Backward references (7)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 4pp US2379187* 1945-06 Richards    
Get PDF - 3pp US3471675  1969-10 Sargent et al.   ARC TORCH
Get PDF - 7pp US4002878  1977-11 Disney  Utah State University Foundation Gas tungsten arc welding electrode
Get PDF - 30pp US4549065  1985-10 Camacho et al.  Technology Application Services Corporation Plasma generator and method
Get PDF - 8pp US4891490  1990-01 Labrot et al.  Aerospatiale Societe Nationale Industrielle Tubular electrode for plasma torch and plasma torch provided with such electrodes
Get PDF - 9pp US4924059  1990-05 Rotolico et al.  The Perkin-Elmer Corporation Plasma gun apparatus and method with precision adjustment of arc voltage
  * some details unavailable
Foreign References: None

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