| 摘要 |
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 min ) 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 surrouned by a casing tube (15). The drill tool also comprises means to supply flush medium and means to remove flush medium and cuttings.
<??>The characterizing for the invention is that the reamer (11; 11 min ) is driven through a co-operation between a tongue (21; 21 min ) and a shoulder (22,24; 22 min ,24 min ), said tongue (21; 21 min ) can be located either on a portion (16) that receives the reamer (11) or on the reamer (11 min ) itself and the shoulders (22,24; 22 min ,24 min ) either on the reamer (11) or the portion (16 min ) that receives said reamer (11 min ). |
