B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
77/28
B23B 41/04 (2006.01) B23B 51/00 (2006.01) E21B 3/02 (2006.01) E21B 19/086 (2006.01) E21B 19/16 (2006.01)
Patent
CA 1131052
Abstract of the Disclosure A chuck mechanism for a raise drill includes a rotatable drive shaft, drill pipe and chuck for engaging the drill pipe co-axial with the drive shaft and transmitting torque from the drive shaft to the drill pipe. The drive shaft is rotatably coupled to the chuck with relative axial movement allowed. First spaced apart cooperating contact surfaces between the drive shaft and the chuck can be brought together for trans- mitting axial force from the drive shaft to the chuck in the downward drilling direction. Second spaced apart cooperating contact surfaces between the drive shaft and chuck can be brought together for transmitting axial force from the drive shaft to the chuck in the upward raise drilling direction. The drive shaft and chuck move axially relative to each other when contact is switched from the first to second contact surfaces or vice-versa. The second pair of contact surfaces are shaped and dimensioned for allowing relative angular movement there- between when the drill pipe is deflected laterally. An outer support is connected to a non-rotatable portion of the raise drill in the path of movement of the chuck for absorbing any moment load exerted by the drill pipe when it is angularly deflected.
350571
Patrick Dennis J.
Winsor Jack O.
Dresser Industries Inc.
Macrae & Co.
LandOfFree
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