US3242300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for welding metal tubing
Assignee: Ohio Crankshaft Co
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Filing: 1963-10-28
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Granted: 1966-03-22
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Expires: 1983-10-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry B Osborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:42
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/08; B23K11/082; B23K11/084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
A METHOD OF PRODUCING A SPIRALLY FORMED, METAL TUBING HAVING A SPIRAL, INTERLOCKED SEAM WITH AT LEAST FOUR SEPARATE LAYERS OF METAL AND A THICKNESS T, SAID METHOD COMPRISING THE STEPS OF: FORMING SAID SPIRAL, INTERLOCKED SEAM IN SAID TUBING, ADVANCING THE TUBING PAST A HIGH FREQUENCY INDUCTION HEATING UNIT WITH THE PREVIOUSLY FORMED SEAM PASSING BENEATH THE UNIT, MAINTAINING SAID SEAM CLOSELY SPACED FROM SAID UNIT AS IT PASSES SAID UNIT, POWERING SAID UNIT WITH AN ALTERNATING CURRENT HAVING A FREQUENCY WHICH WILL RESULT IN A REFERENCE DEPTH D, AT LEAST AS GREAT AS THE THICKNESS T, OF SAID MULTI-LAYER SEAM WHEREIN SAID DEPTH IS DETERMINED BY THE FORMULA D=3160$P/F, WITH P BEING THE RESISTIVITY OF THE METAL FORMING THE TUBING IN OHMS-INCHES AND F BEING THE FREQUENCY OF SAID ALTERNATING CURRENT IN CYCLES PER SECOND, CONTROLLING THE LINEAR SPEED OF SAID TUBING SO THAT THE MULTI-LAYER, PREFORMED SEAM IS RAISED TO A TEMPERATURE AT LEAST EQUAL TO THE WELDING TEMPERATURE OF THE METAL FORMING THE LAYERS OF THE SEAM AND, THEREAFTER, BEFORE SAID SEAM COOLS TO A TEMPERATURE LESS THAN THE WELDING TEMPERATURE OF SAID SEAM METAL, PRESSING SAID SEAM TOGETHER WITH SUFFICIENT FORCE TO WELD SAID MULTI-LAYER SEAM.
Claim 2
Independent Claim
201 words
A METHOD OF PRODUCING A SPIRALLY FORMED, METAL TUBING HAVING A SPIRAL, INTERLOCKED SEAM WITH AT LEAST FOUR SEPARATE LAYERS OF METAL AND A THICKNESS T, SAID METHOD COMPRISING THE STEPS OF: FORMING SAID SPIRAL, INTERLOCKED SEAM IN SAID TUBING, ADVANCING THE TUBING PAST A HIGH FREQUENCY INDUCTION HEATING UNIT WITH THE PREVIOUSLY FORMED SEAM PASSING BENEATH THE UNIT, MAINTAINING SAID SEAM CLOSELY SPACED FROM SAID UNIT AS IT PASSES SAID UNIT, POWERING SAID UNIT WITH AN ALTERNATING CURRENT HAVING A FREQUENCY WHICH WILL RESULT IN A REFERENCE DEPTH D, AT LEAST AS GREAT AS THE THICKNESS T, OF SAID MULTI-LAYER SEAM WHEREIN SAID DEPTH IS DETERMINED BY THE FORMULA D=3160$P/F, WITH P BEING THE RESISTIVITY OF THE METAL FORMING THE TUBING IN OHMS-INCHES AND F BEING THE FREQUENCY OF SAID ALTERNATING CURRENT IN CYCLES PER SECOND, CONTROLLING THE LINEAR SPEED OF SAID TUBING SO THAT THE MULTI-LAYER, PREFORMED SEAM IS RAISED TO A TEMPERATURE AT LEAST EQUAL TO THE WELDING TEMPERATURE OF THE METAL FORMING THE LAYERS OF THE SEAM AND, THEREAFTER, BEFORE SAID SEAM COOLS TO A TEMPERATURE LESS THAN THE WELDING TEMPERATURE OF SAID SEAM METAL, PRESSING SAID SEAM TOGETHER WITH SUFFICIENT FORCE TO WELD SAID MULTI-LAYER SEAM.
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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |