Drill tool

Details Drill tool Drill tool

E - Fixed Constructions

21

B

255/80

E21B 10/32 (2006.01) E21B 10/04 (2006.01) E21B 10/40 (2006.01) E21B 10/56 (2006.01) E21B 10/66 (2006.01)

Patent

CA 1144146

ABSTRACT A drill tool for rotary and/or percussion drilling with drill rod means within casing tube means comprises a centric cutting bit and an eccentric reamer cutter, both provided with hard metal inserts. For purposes of obtaining a life of the drill tool as long as possible the first frontal insert on the reamer cutter is positioned in front of the first peripheral insert when seen in the rotational direction during drilling, and the centric cutting bit provided with more inserts on the half of its front surface opposed to the reamer cutter during drilling than on the other half.

372292

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