Drill tool

Details Drill tool Drill tool

E - Fixed Constructions

21

B

255/79

E21B 10/32 (2006.01) E21B 7/20 (2006.01) E21B 10/40 (2006.01) E21B 10/66 (2006.01)

Patent

CA 1295605

ABSTRACT OF THE DISCLOSURE The present invention relates to a drill tool for rotary and/or percussive drilling comprising a central pilot bit (12) and a, in the feed direction of the tool, behind the pilot bit located eccentric reamer (11;11') that via guide means (10) is connected to a drill string that is rotatably coupled to a drill machine, said drill string and the guide means (10) being at least partially surrounded by a casing tube (15). The drill tool also comprises means to supply flush medium and means to remove flush medium and cuttings. The reamer (11;11') is driven through a co- operation between a tongue (21;21') and a shoulder (22,24;22',24'), said tongue (21;21') can be located either on a portion (16) that receives the reamer (11) or on the reamer (11') itself and the shoulders (22,24;22',24') either on the reamer (11) or the portion (16') that receives said reamer (11').

530165

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