Patent US3729675A successfully refreshed from Google Patents.
Patent US3674978A successfully refreshed from Google Patents.
US3674978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torch, especially for plasma cutting
Assignee: Messer Griesheim GmbH
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Filing: 1971-04-23
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Granted: 1972-07-04
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Expires: 1991-04-23
Abstract
Abstract Disclosed is a plasma cutting torch comprising an electrode holder, an intermediate insulating piece and a nozzle holder with a nozzle inset. The parts are coaxially arranged and connected by axial fastening means. The insulating piece has a central passage into which centering plugs of the electrode holder and of the nozzle holder are inserted. A central through bore in the electrode holder holds an electrode extending through a ceramic cartridge into the interior of the nozzle inlet.
Inventors
- 👤 Werner Becker
- 👤 Alfward Farwer
- 👤 Georg Frank
- 👤 Bernhard Reis
- 👤 Josef Rohf
- 👤 Rupert Auer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:42
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/226; H05H1/34; H05H1/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
A torch, especially a plasma cutting and/or welding torch, comprising an electrode holder having a central through bore for receiving an electrode, a plurality of channels arranged beside and substantially parallel to said central bore for conducting working gas and cooling fluid, a lateral tapped hole with an electrode fixing screw arranged at an angle to said central bore, and a centering plug of reduced diameter enclosing lower portions of said central bore and said gas conducting channels; an insulating piece of annular configuration having a central passage for receiving said centering plug, channels for conducting cooling fluid arranged substantially parallel to said central bore and in alignment with corresponding channels in said electrode holder; a nozzle holder having a top surface mating with the bottom of said insulating piece, an upwardly directed centering plug fitting into said central passage of said insulating piece, a stepped central boring for receiving an insulating gas distributing cartridge at its upper section and a nozzle inset at its lower section, and an annular chamber surrounding said nozzle inset and a portion of said cartridge and communicating with said cooling fluid channels.
Claim 2
Dependent Claim
188 words
A torch, especially a plasma cutting and/or welding torch, comprising an electrode holder having a central through bore for receiving an electrode, a plurality of channels arranged beside and substantially parallel to said central bore for conducting working gas and cooling fluid, a lateral tapped hole with an electrode fixing screw arranged at an angle to said central bore, and a centering plug of reduced diameter enclosing lower portions of said central bore and said gas conducting channels; an insulating piece of annular configuration having a central passage for receiving said centering plug, channels for conducting cooling fluid arranged substantially parallel to said central bore and in alignment with corresponding channels in said electrode holder; a nozzle holder having a top surface mating with the bottom of said insulating piece, an upwardly directed centering plug fitting into said central passage of said insulating piece, a stepped central boring for receiving an insulating gas distributing cartridge at its upper section and a nozzle inset at its lower section, and an annular chamber surrounding said nozzle inset and a portion of said cartridge and communicating with said cooling fluid channels.
Claim 3
Dependent Claim
41 words
A torch according to claim 1, further comprising a tapped hole arranged parallel to said central throughbore in said electrode holder, and a stepped hole arranged in said insulating piece in alignment with said tapped hole for receiving a fastening screw.
Claim 4
Dependent Claim
21 words
A torch according to claim 2 wherein said insulating piece and said nozzle holder are clamped together by a box nut.
Claim 5
Dependent Claim
15 words
A torch according to claim 1 wherein said protective cartridge is of a ceramic material.
Claim 6
Dependent Claim
15 words
A torch according to claim 1 further comprising an outer protective jacket of ceramic material.
Claim 7
Dependent Claim
20 words
A torch according to claim 5 wherein said lateral tapped hole in said electrode holder is accessible from the outside.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |