US3752460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen trap scarfing apparatus
Assignee: L-Tec Co
•
Filing: 1972-02-17
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Granted: 1973-08-14
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Expires: 1992-02-17
Abstract
Abstract The time required for scarfing the surface of a metal body is decreased by shortening the preheating time. This is accomplished by directing a row of ''''trap'''' oxygen streams from ports located above the upper preheat fuel gas ports so that the oxygen streams form a plane which intersects the surface of the metal body in such way as to form a wedge shaped pocket to confine the burning preheating gases. This results in faster puddle formation and causes the puddle to be formed at a location just ahead of the projected converging point of the fuel and oxygen gas streams, rather than in back of the converging point where it would be formed by prior art methods.
Inventors
- 👤 T Lytle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
B; B23; B23K; B23K7/00; B23K7/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
245 words
In a continuous slot, post-mixed fuel-oxygen scarfing apparatus wherein said slot is formed between an upper preheat block and a lower preheat block which are in spaced relation to one another, wherein means are provided for controllably discharging a sheet-like stream of oxidizing gas through said slot for reacting with a metal surface to be scarfed as well as for burning preheat fuel gas, and wherein said scarfing apparatus is provided with a row of ports communicating with supply passages for discharging a plurality of parallel streams of preheat fuel gas from at least the upper preheat block to converge with said stream of oxidizing gas, the improvement comprising: a row of oxygen ports located in said upper preheat block above said row of fuel gas ports communicating with oxygen supply passages, means for controlling the flow of oxygen through said oxygen supply passages independently of the flow of said sheet-like stream of oxidizing gas, said row of oxygen ports being capable of discharging a plurality of parallel streams of oxygen gas which form a sheet-like oxygen gas curtain, said oxygen ports being directed at the converging point of the straight line projections of the oxidizing gas and fuel gas streams so as to cause the oxygen curtain streams emanating therefrom to form a wedge shaped pocket between the planes formed by said curtain oxygen stream and the surface of said metal body, thereby confining the fuel and oxidizing gases discharged from their respective ports.
Claim 2
Dependent Claim
245 words
In a continuous slot, post-mixed fuel-oxygen scarfing apparatus wherein said slot is formed between an upper preheat block and a lower preheat block which are in spaced relation to one another, wherein means are provided for controllably discharging a sheet-like stream of oxidizing gas through said slot for reacting with a metal surface to be scarfed as well as for burning preheat fuel gas, and wherein said scarfing apparatus is provided with a row of ports communicating with supply passages for discharging a plurality of parallel streams of preheat fuel gas from at least the upper preheat block to converge with said stream of oxidizing gas, the improvement comprising: a row of oxygen ports located in said upper preheat block above said row of fuel gas ports communicating with oxygen supply passages, means for controlling the flow of oxygen through said oxygen supply passages independently of the flow of said sheet-like stream of oxidizing gas, said row of oxygen ports being capable of discharging a plurality of parallel streams of oxygen gas which form a sheet-like oxygen gas curtain, said oxygen ports being directed at the converging point of the straight line projections of the oxidizing gas and fuel gas streams so as to cause the oxygen curtain streams emanating therefrom to form a wedge shaped pocket between the planes formed by said curtain oxygen stream and the surface of said metal body, thereby confining the fuel and oxidizing gases discharged from their respective ports.
Claim 3
Dependent Claim
34 words
The scarfing apparatus of claim 1 wherein said lower preheat block also is provided with a row of ports communicating with supply passages for discharging a plurality of parallel streams of preheat fuel gas.
References Cited (Backward Citations)
US2622048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |