Replaceable drive stem for a raise drill

Details Replaceable drive stem for a raise drill Replaceable drive stem for a raise drill

E - Fixed Constructions

21

B

255/75

E21B 10/00 (2006.01) E21B 17/00 (2006.01)

Patent

CA 1057277

Abstract A raise type of earth boring drill in which the cutter assembly is detachably secured to the drive stem to permit replacement of the stem. The stem slidably engages a central opening in the cutter assembly, the cutter assembly engaging a shoulder on the stem which carries axial loads in the drill. The cutter assembly is detachably anchored by a plurality of bolts to a torque plate attached to the end of the stem for transmitting torque load to the cutter assembly, the bolts clamping the cutter assembly against the shoulder.

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