Patent US3783229A successfully refreshed from Google Patents.
US3783229A
Expired / Lapsed
US
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Device for plasma welding and cutting
Assignee: Messer Griesheim GmbH
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Filing: 1972-08-02
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Granted: 1974-01-01
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Expires: 1992-08-02
Abstract
Abstract A device for plasma welding and cutting by means of a plasma torch or burner. A first current source is provided for feeding a pilot arc discharge. The negative pole of the current source is connected to the electrode of the burner while the positive pole is connected to the nozzle of the burner. A second current source feeds the main plasma arc discharge and its negative pole is connected to the burner electrode and the positive pole to the work piece. Specifically, the current branch of the second current source which connects to the work piece is bypassed by a bypass branch in such a manner that when the plasma main arc discharge current is closed the resulting peak current is diverted through this bypass branch.
Inventors
- 👤 J Rohe
- 👤 D Staacks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:10
CPC Classifications
B; B23; B23K; B23K10/00; B23K10/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
Device for plasma welding and cutting of a work piece comprising: a. a plasma torch; b. a first current source having a positive terminal and a negative terminal for feeding the pilot arc discharge of said torch; c. a burner nozzle for said torch; d. said plasma torch having an electrode; e. the positive terminal of said first current source being connected to said burner nozzle; f. the negative terminal of said first current source being connected to said electrode; g. a second current source for feeding the main arc discharge, said second source having a negative terminal connected to said electrode and a positive terminal connected to the work piece; and h. a bypass branch for interconnecting the exit leads of said second current source so that the peak current created at the instant of closing the current circuit of the main plasma arc discharge is capable of being diverted through said bypass branch.
Claim 2
Dependent Claim
155 words
Device for plasma welding and cutting of a work piece comprising: a. a plasma torch; b. a first current source having a positive terminal and a negative terminal for feeding the pilot arc discharge of said torch; c. a burner nozzle for said torch; d. said plasma torch having an electrode; e. the positive terminal of said first current source being connected to said burner nozzle; f. the negative terminal of said first current source being connected to said electrode; g. a second current source for feeding the main arc discharge, said second source having a negative terminal connected to said electrode and a positive terminal connected to the work piece; and h. a bypass branch for interconnecting the exit leads of said second current source so that the peak current created at the instant of closing the current circuit of the main plasma arc discharge is capable of being diverted through said bypass branch.
Claim 3
Dependent Claim
46 words
Device as defined in claim 1 wherein said bypass branch is connected with one end with the positive terminal of said second source and with its other end through said nozzle, the pilot arc discharge and said electrode with the negative terminal of said second source.
Claim 4
Dependent Claim
15 words
Device as defined in claim 2 wherein a switch is provided in said bypass branch.
Claim 5
Dependent Claim
28 words
Device as defined in claim 3 wherein a relay is provided for controlling said switch, said relay being disposed in the current branch connected to the work piece.
Claim 6
Dependent Claim
14 words
Device as defined in claim 4 wherein said relay has an adjustable response time.
References Cited (Backward Citations)
DE1910398A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |