Activated earth drill

Details Activated earth drill Activated earth drill

E - Fixed Constructions

21

B

255/72

E21B 4/04 (2006.01) E21B 4/00 (2006.01) E21B 4/10 (2006.01) E21B 4/16 (2006.01)

Patent

CA 1321189

ABSTRACT OF THE DISCLOSURE The invention relates to a method of earth drilling by means of a drill bit which is attached to a drill rod and includes the steps of rotating the bit on the drill rod axis and rotating an eccentric weight by means in the bit to impart a hammer action to the bit. The drill bit includes a drive arrangement having two opposed drive shafts which are transverse to the drill rod axis, means for driving the shafts and a rock comminuting cutter which is eccentrically mounted on each of the shafts.

534636

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