US4650953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma torch
Assignee: Primetals Technologies Austria GmbH
•
Filing: 1985-10-07
•
Granted: 1987-03-17
•
Expires: 2005-10-07
Abstract
Abstract A plasma torch comprises an electrode secured to a liquid-cooled electrode holder and formed with a flow passage communicating with a central outlet for delivering an ionizable gas and a nozzle body which surrounds the electrode and serves to conduct gas along the outside surface of the electrode. To permit an increase of the torch power, the central outlet communicating with the flow passage constitutes a diffuser. The outlet opening of the diffuser is axially spaced from the nozzle body.
Inventors
- 👤 Wolfgang Eger
- 👤 Gerhard Scheiblhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:09
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/3436; H05H1/3478; H05H1/3484
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
In plasma torch comprising a liquid-coolable electrode holder, an electrode secured to said electrode holder and having an outside peripheral surface, a centrally disposed outlet and a centrally disposed gas flow passage communicating with said outlet, and a nozzle body surrounding said outside peripheral surface and defining an annular gas flow passage therewith, wherein the improvement comprises that said centrally disposed outlet constitutes diffuser for the gas flow, the diffuser having an outlet opening axially projecting from said nozzle body.
Claim 2
Dependent Claim
80 words
In plasma torch comprising a liquid-coolable electrode holder, an electrode secured to said electrode holder and having an outside peripheral surface, a centrally disposed outlet and a centrally disposed gas flow passage communicating with said outlet, and a nozzle body surrounding said outside peripheral surface and defining an annular gas flow passage therewith, wherein the improvement comprises that said centrally disposed outlet constitutes diffuser for the gas flow, the diffuser having an outlet opening axially projecting from said nozzle body.
Claim 3
Dependent Claim
15 words
The improvement set forth in claim 1, wherein a Laval nozzle passage defines said diffuser.
Claim 4
Dependent Claim
28 words
The improvement set forth in claim 2, wherein said Laval nozzle passage communicates with said centrally disposed flow passage through at least two openings formed in said electrode.
Claim 5
Dependent Claim
26 words
The improvement set forth in claim 1, wherein said diffuser communicates with said centrally disposed flow passage through at least two openings formed in said electrode.
Claim 6
Dependent Claim
29 words
The improvement set forth in claim 1, wherein said electrode and said nozzle body define between them a radial clearance which increases toward the outlet opening of said diffuser.
References Cited (Backward Citations)
US2967926A
Cited
DE1954851A1
Cited
US3830428A
Cited
DE3241476A1
Cited
US4521666A
Cited
US4558201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |