US3575568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc torch
Assignee: RIKEN
•
Filing: 1968-05-31
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Granted: 1971-04-20
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Expires: 1988-05-31
Abstract
Abstract A method of establishing an electric arc in an electric arc torch having a cathode unit and a plurality of substantially coaxial bushings. The method comprises flowing an enveloper gas between the cathode unit and the adjacent bushing, establishing an arc between the tip of the cathode and the adjacent bushing, flowing an enveloper gas between the adjacent bushing and the next surrounding bushing, and subsequently shifting the end of the arc from the adjacent bushing to the workpiece and stopping the enveloper gas originally presented between the cathode unit and the adjacent bushing.
Inventors
- 👤 Haruo Tateno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:11
CPC Classifications
B; B23; B23K; B23K10/00; B23K10/02; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/341
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
A method of establishing an electric arc with a torch having a cathode unit and a plurality of substantially coaxial bushing surrounding said unit and spaced from said unit and each other, comprising flowing an enveloper gas between said cathode unit and the adjacent bushing, establishing an arc between the tip of said cathode and said adjacent bushing, flowing an enveloper gas between said adjacent bushing and the next surrounding bushing and subsequently shifting the end of said arc from said adjacent bushing to a workpiece, wherein the flow of enveloper gas between said cathode unit and said adjacent bushing is terminated after the arc is established with said last-mentioned gas.
Claim 2
Independent Claim
111 words
A method of establishing an electric arc with a torch having a cathode unit and a plurality of substantially coaxial bushing surrounding said unit and spaced from said unit and each other, comprising flowing an enveloper gas between said cathode unit and the adjacent bushing, establishing an arc between the tip of said cathode and said adjacent bushing, flowing an enveloper gas between said adjacent bushing and the next surrounding bushing and subsequently shifting the end of said arc from said adjacent bushing to a workpiece, wherein the flow of enveloper gas between said cathode unit and said adjacent bushing is terminated after the arc is established with said last-mentioned gas.
Claim 3
Dependent Claim
50 words
A method of electric arc welding according to claim 1, wherein the enveloper gas flowing between said cathode unit and said adjacent bushing is chemically inactive to the cathode material and enveloper gas flowing between said adjacent bushing and the next surroundinG bushing is chemically inactive to the cathode material.
Claim 4
Independent Claim
96 words
A method of establishing an electric arc with a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising flowing a first enveloper gas between said cathode unit and the adjacent bushing, flowing a second enveloper gas between said adjacent bushing and the next surrounding bushing, establishing an arc between the tip of said cathode unit and a workpiece, and stopping the flow of said first enveloper gas, after the arc is established between the tip of the cathode and the workpiece.
Claim 5
Independent Claim
96 words
A method of establishing an electric arc with a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising flowing a first enveloper gas between said cathode unit and the adjacent bushing, flowing a second enveloper gas between said adjacent bushing and the next surrounding bushing, establishing an arc between the tip of said cathode unit and a workpiece, and stopping the flow of said first enveloper gas, after the arc is established between the tip of the cathode and the workpiece.
Claim 6
Independent Claim
108 words
A method of operating a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising flowing a first enveloper gas between said cathode unit and the adjacent bushing, establishing an arc, between the tip of said cathode unit and said adjacent bushing, flowing a second enveloper gas between said adjacent bushing and the next surrounding bushing, shifting the end of said arc from said adjacent bushing to said next surrounding bushing, stopping the flow of the first enveloper gas, and shifting the end of said arc from said next surrounding bushing to a workpiece.
Claim 7
Independent Claim
108 words
A method of operating a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising flowing a first enveloper gas between said cathode unit and the adjacent bushing, establishing an arc, between the tip of said cathode unit and said adjacent bushing, flowing a second enveloper gas between said adjacent bushing and the next surrounding bushing, shifting the end of said arc from said adjacent bushing to said next surrounding bushing, stopping the flow of the first enveloper gas, and shifting the end of said arc from said next surrounding bushing to a workpiece.
Claim 8
Independent Claim
97 words
A method of operating a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising flowing a first enveloper gas between said cathode unit and the adjacent bushing, establishing an arc between the tip of said cathode unit and said adjacent bushing, flowing a second enveloper gas between said adjacent bushing and the next surrounding bushing, shifting the end of said arc from said adjacent bushing to a workpiece via said next surrounding bushing, and stopping the flow of the first enveloper gas.
Claim 9
Independent Claim
97 words
A method of operating a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising flowing a first enveloper gas between said cathode unit and the adjacent bushing, establishing an arc between the tip of said cathode unit and said adjacent bushing, flowing a second enveloper gas between said adjacent bushing and the next surrounding bushing, shifting the end of said arc from said adjacent bushing to a workpiece via said next surrounding bushing, and stopping the flow of the first enveloper gas.
Claim 10
Independent Claim
109 words
A method of operating a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising simultaneously flowing a first enveloper gas between the cathode unit and the adjacent bushing and a second enveloper gas between said adjacent bushing and the next surrounding bushing, establishing an arc between the tip of the cathode unit and said adjacent bushing, shifting the end of said arc from said adjacent bushing to said next surrounding bushing, stopping the flow of the first enveloper gas, and shifting the end of said arc from said next surrounding bushing to a workpiece.
Claim 11
Independent Claim
109 words
A method of operating a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising simultaneously flowing a first enveloper gas between the cathode unit and the adjacent bushing and a second enveloper gas between said adjacent bushing and the next surrounding bushing, establishing an arc between the tip of the cathode unit and said adjacent bushing, shifting the end of said arc from said adjacent bushing to said next surrounding bushing, stopping the flow of the first enveloper gas, and shifting the end of said arc from said next surrounding bushing to a workpiece.
Claim 12
Independent Claim
105 words
A method of operating a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising simultaneously flowing a first enveloper gas between said cathode unit and the adjacent bushing and a second enveloper gas between the adjacent bushing and the next surrounding bushing, establishing an arc between the tip of said cathode unit and said adjacent bushing, shifting the end of said arc from said adjacent bushing to a workpiece via said next surrounding bushing and stopping the first enveloper gas while leaving the second enveloper gas flowing around the arc.
Claim 13
Independent Claim
105 words
A method of operating a torch having a cathode unit and a plurality of substantially coaxial bushings surrounding said unit and spaced from said unit and each other, comprising simultaneously flowing a first enveloper gas between said cathode unit and the adjacent bushing and a second enveloper gas between the adjacent bushing and the next surrounding bushing, establishing an arc between the tip of said cathode unit and said adjacent bushing, shifting the end of said arc from said adjacent bushing to a workpiece via said next surrounding bushing and stopping the first enveloper gas while leaving the second enveloper gas flowing around the arc.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |