US3621178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for manufacturing finned pipes
Assignee: Nikon Kentetsu KK
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Filing: 1970-01-15
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Granted: 1971-11-16
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Expires: 1990-01-15
Abstract
Abstract A metallic strip is wrapped into a helix around a metallic pipe by having one of its edges contacted by the pipe and welded on to the pipe with a welding current having a frequency ranging from 1 to 10 MHz. The current is applied across the strip and pipe from very close to a point where the strip begins to contact the pipe.
Inventors
- 👤 Kunihiro Nakayama
- 👤 Keiichi Kojima
- 👤 Shingo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; B23; B23K; B23K13/00; B23K13/01; B23K13/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
A method of manufacturing finned pipe through the use of an apparatus including means for wrapping an thin metallic strip in the form of a helix around the outer periphery of a length of metallic pipe while the plane of the strip extends substantially radially of the longitudinal axis of the pipe, and welding that edge contacted by the outer periphery of the pipe of the strip to the periphery of the pipe with a short wave welding current, which method comprises the steps of passing the successive portions of said strip to their predetermined positions relative to said outer periphery of said pipe to wrap said portions in the form of a helix around said pipe, slidingly positioning a first electrical contact on the edge of said strip to be welded to said pipe at a position closely adjacent that point where said strip first contacts said pipe, slidingly positioning a second electrical contact on said pipe closely adjacent said point, and supplying a short wave welding current through said contacts across said pipe and said strip to said point, said welding current having a frequency ranging from 1 to 10 MHz.
Claim 2
Independent Claim
193 words
A method of manufacturing finned pipe through the use of an apparatus including means for wrapping an thin metallic strip in the form of a helix around the outer periphery of a length of metallic pipe while the plane of the strip extends substantially radially of the longitudinal axis of the pipe, and welding that edge contacted by the outer periphery of the pipe of the strip to the periphery of the pipe with a short wave welding current, which method comprises the steps of passing the successive portions of said strip to their predetermined positions relative to said outer periphery of said pipe to wrap said portions in the form of a helix around said pipe, slidingly positioning a first electrical contact on the edge of said strip to be welded to said pipe at a position closely adjacent that point where said strip first contacts said pipe, slidingly positioning a second electrical contact on said pipe closely adjacent said point, and supplying a short wave welding current through said contacts across said pipe and said strip to said point, said welding current having a frequency ranging from 1 to 10 MHz.
Claim 3
Dependent Claim
51 words
A method of manufacturing a finned pipe as claimed in claim 1 wherein said metallic strip is formed of a metallic material selected from the group consisting of copper and alloys thereof and has a thickness of from 0.15 to 0.8 mm. and a width of from 5 to 25 mm.
Claim 4
Dependent Claim
51 words
A method of manufacturing a finned pipe as claimed in claim 1 wherein said metallic strip is formed of a metallic material selected from the group consisting of aluminum and alloys thereof and has a thickness of from 0.2 to 1.05 mm. and a width of from 7 to 30 mm.
Claim 5
Dependent Claim
183 words
In an apparatus for manufacturing finned pipes, including means for wrapping a thin metallic strip in the form of a helix around the outer periphery of a length of metallic pipe while the plane of said strip extends substantially radially of the longitudinal axis of said pipe and for welding that edge of said strip contacted by the outer periphery of said pipe to the periphery of said pipe with a short wave welding current, the combination comprising guide means for passing successive portions of said strip to their predetermined positions relative to said outer periphery of said pipe to wrap them in the form of a helix around said pipe, a first electrical contact slidingly positioned on said edge of said strip to be welded to said pipe at a position closely adjacent that point where said strip first contacts said pipe, a second electrical contact slidingly positioned on said pipe closely adjacent said point, and short wave generator means connected across said first and second electric contacts for providing a welding current having a frequency ranging from 1 to 10 MHz.
Claim 6
Dependent Claim
183 words
In an apparatus for manufacturing finned pipes, including means for wrapping a thin metallic strip in the form of a helix around the outer periphery of a length of metallic pipe while the plane of said strip extends substantially radially of the longitudinal axis of said pipe and for welding that edge of said strip contacted by the outer periphery of said pipe to the periphery of said pipe with a short wave welding current, the combination comprising guide means for passing successive portions of said strip to their predetermined positions relative to said outer periphery of said pipe to wrap them in the form of a helix around said pipe, a first electrical contact slidingly positioned on said edge of said strip to be welded to said pipe at a position closely adjacent that point where said strip first contacts said pipe, a second electrical contact slidingly positioned on said pipe closely adjacent said point, and short wave generator means connected across said first and second electric contacts for providing a welding current having a frequency ranging from 1 to 10 MHz.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |