A ONE-PIECE DRILL BIT FOR SINGLE-PASS ANCHOR BOLTING AND SINGLE PASS DRILLING APPARATUS

摘要

The present invention relates to a drill bit (16) and a single pass drilling apparatus (10). The one-piece drill bit (16) has a connection portion, adapted to be rigidly connected to a drill steel, a pilot part (14) and a reamer part (19). The pilot part has first rock machining means (17). The reamer part has a first center line (CL2) and second rock machining means (18A,18B,18C). The second rock machining means is provided axially between said connection portion and said first rock machining means and to one side of the pilot part. The drill bit has a rotational direction (R). A middle line (CL1 ) of the pilot part (14) forms an acute first angle (a) with an axis (CL3) extending parallel to the first center line (CL2).