Coring tool
US4930587A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1989 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Aug 28, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B25/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A coring tool comprises a core cutting section and an actuating section disposed thereabove. The core cutting section includes axially telescoping outer and inner barrels. The inner barrel includes a jaw carrier which carries pivotable core-catching jaws normally covered along their radially inner sides by a driver sleeve. When the driver sleeve is raised by the actuator section the jaws are uncovered. Thereafter, the driver sleeve raises the jaw carrier to bring the jaws into contact with a stationary inclined jaw-deflecting surface to force the jaws laterally inwardly through the core. The actuator section relies upon fluid pressure to release for movement a vertically risible member which is mechanically lifted by a drill string to transmit vertical forces to the driver sleeve from a drill string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.