Tube rolling mill with a tapered mandrel
Abstract
Abstract A TUBE ROLLING MILL HAVING TWO SETS OF THREE ROLLS EACH WHICH ARE RECIPROCATINGLY DRIVEN ALONG A LENGTH OF A TUBE SUPPORTED BY A TAPERED MANDREL. EACH ROLL IS FORCED AGAINST THE TUBE BY ITS INDIVIDUAL CAMS EACH HAVIN A SURFACE WITH ONE OR MORE TAPERS WHICH ARE RELATED TO MULTIPLE MANDREL TAPER IN A MANNER TO PROVIDE REDUCTION IN BOTH WALL THICKNESS AND INSIDE DIAMETER OF THE TUBE. EACH ROLL IS PROVIDED WITH A TUBE CONTACTING GROOVE HAVING IN CROSS-SECTION A CENTRAL ARC WITH A RADIUS OF CURVATURE SUBSTANTIALLY EQUAL TO THE SMALLEST RADIUS OF THAT PORTION OF THE TUBE CONTACTED BY THE ROLL, WITH EITHER SIDE OF THE CENTRAL ARC JOINED BY LINES TANGENT THERETO WITH LARGE RADII OF CURVATURE CHOSEN SO THAT EACH ROLL CONTACTS A TUBE IN TWO ZONES AROUND ITS CIRCUMFERENCE. THE ROLLS ARE PRESSED AGAINST THE TUBE UPON THE URGING OF THE TAPERED CAM SURFACE AGAINST A ROLL TRUNNION. THE RADIUS OF THE TRUNNION IS CAREFULLY CHOSEN TO CONTROL LONGITUDINAL FORCES TRANSFERRED TO THE TUBE BY THE ROLL.
Inventors
- 👤 Richard H Gabel
- 👤 Frank L C Williams
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |