<p>A coring tool comprises a core cutting section (10) and an actuating section (12) disposed thereabove. The core cutting section (10) 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 raisable member which transmits vertical forces to the driver sleeve from a drill string.</p>
申请公布号
EP0395620(A2)
申请公布日期
1990.10.31
申请号
EP19900870062
申请日期
1990.04.25
申请人
DIAMANT BOART STRATABIT S.A.
发明人
YOUNG, DAVID E.;KOSKIE, EARL T., JR.;EASTON, ANDREW R.