Borehole drill construction

Details Borehole drill construction Borehole drill construction

E - Fixed Constructions

21

B

255/59, 255/84

E21B 17/07 (2006.01) E21B 4/14 (2006.01) E21B 21/12 (2006.01)

Patent

CA 1282053

ABSTRACT A borehole drill construction comprising a cylindrical casing , a chuck mounted on one end of the casing by means of a screw-thread and a cutter head carried by the chuck. The chuck has at least one axially projecting dog thereon which is received in a corresponding recess in the cutter head to provide a means to transmit torque from the casing to the cutter head via the chuck. The cutter head is retained on the bit by at least one plug projecting into a slot in the cutter head, which is permitted limited axial movement thereby.

535629

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