Fatigue enhancement of material surrounding openings in workpieces
US7024908B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2003 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Jun 3, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D7/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An elongated first tubular member has a mandrel receiving center passageway and a slotted outer end portion that comprises first axial fingers separated by first axial slots. An elongated second tubular member surrounds the first tubular member and has a slotted outer end portion that comprises second axial fingers separated by second axial slots. An elongated third tubular member surrounds the second tubular member and has a slotted outer end portion comprising third axial fingers separated by third axial slots. An elongated mandrel is positioned inside the center passageway. The first tubular member is extendable and retractable longitudinally of the second and third tubular members. A tubular sleeve is provided that has an inner end and a flange projecting radially outwardly from the sleeve at the inner end. The mandrel is extendable axially through the center passageway of the first tubular member and axially through the tubular sleeve when the radial flange is clamped by and between the first and second fingers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.