US3674213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting head for thermochemical machining
Assignee: Air Liquide SA
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Filing: 1970-10-14
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Granted: 1972-07-04
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Expires: 1990-10-14
Abstract
Abstract In this cutting head for thermochemical machining by an oxygen jet surrounded by heating flames, a curtain of oxygen is interposed between the flames and the jet. The curtain is supplied by the cutting oxygen and prevents the pollution of the oxygen jet by the flames. A cutting nozzle divides the oxygen stream into the central, cutting jet and the protective curtain.
Inventors
- 👤 Jean Le Mounier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:38
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/48; F23D14/52; F23D14/54
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
172 words
In a torch head for thermochemical machining, comprising a body having therein an axial passage for cutting oxygen, said axial passage being bounded by a wall terminating in a central orifice on the outlet side of said passage, passage means spaced from and surrounding said axial passage, means for supplying cutting oxygen to said axial passage and means for supplying said passage means spaced from the axial passage with combustible gas and with combustion-supporting gas; the improvement comprising a nozzle affixed in said axial passage to the wall thereof, said nozzle dividing said axial passage adjacent the outlet thereof into a central jet and an auxiliary outlet disposed around said central jet, whereby oxygen flowing through said passage is divided by said nozzle into a high velocity stream of cutting oxygen which issues from said central jet and a curtain of lower velocity oxygen which issues from said auxiliary outlet and is parallel to said central jet, the end of said nozzle adjacent said outlet being set back from said central orifice.
Claim 2
Dependent Claim
172 words
In a torch head for thermochemical machining, comprising a body having therein an axial passage for cutting oxygen, said axial passage being bounded by a wall terminating in a central orifice on the outlet side of said passage, passage means spaced from and surrounding said axial passage, means for supplying cutting oxygen to said axial passage and means for supplying said passage means spaced from the axial passage with combustible gas and with combustion-supporting gas; the improvement comprising a nozzle affixed in said axial passage to the wall thereof, said nozzle dividing said axial passage adjacent the outlet thereof into a central jet and an auxiliary outlet disposed around said central jet, whereby oxygen flowing through said passage is divided by said nozzle into a high velocity stream of cutting oxygen which issues from said central jet and a curtain of lower velocity oxygen which issues from said auxiliary outlet and is parallel to said central jet, the end of said nozzle adjacent said outlet being set back from said central orifice.
Claim 3
Dependent Claim
26 words
A torch head as claimed in claim 1, wherein said end of the nozzle is set back by a distance of about 0.5 to 1.0 mm.
Claim 4
Dependent Claim
66 words
A torch head as claimed in claim 1, the external diameter of said nozzle adjacent its outlet end being smaller than the internal diameter of the surrounding portion of said wall thereby to define an annular space between said nozzle and said wall, said annular space terminating in said auxiliary outlet, and at least one duct interconnecting the interior of said nozzle and said annular space.
Claim 5
Dependent Claim
21 words
A torch head as claimed in claim 3, said at least one duct comprising at least one hole through the nozzle.
Claim 6
Dependent Claim
52 words
A torch head as claimed in claim 4, said at least one hole having a total cross-sectional area less than the cross-sectional area of said annular space thereby to reduce the velocity of gas that emerges from said auxiliary outlet relative to the velocity of gas that emerges from said central jet.
Claim 7
Dependent Claim
39 words
A torch head as claimed in claim 3, said nozzle being secured to the wall of said axial passage with good thermal contact by welding in the region of the nozzle which is not surrounded by said annular space.
Claim 8
Dependent Claim
39 words
A torch head as claimed in claim 3, said nozzle being secured to the wall of said axial passage with good thermal contact by crimping in the region of the nozzle which is not surrounded by said annular space.
Claim 9
Dependent Claim
42 words
A torch head as claimed in claim 3, said nozzle being secured to the wall of said axial passage with good thermal contact by expanding against said wall in the region of the nozzle which is not surrounded by said annular space.
Claim 10
Dependent Claim
13 words
A torch head as claimed in claim 8, said nozzle being of copper.
Claim 11
Dependent Claim
14 words
A torch head as claimed in claim 1, said nozzle having high heat conductivity.
References Cited (Backward Citations)
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Cited
US1888385A
Cited
US1980636A
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US2210402A
Cited
US2367316A
Cited
US3389861A
Cited
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 |