Patent ID: 7044678

Claim:
Connection of an anchor rod ( 6 ) to a drilling tool ( 1 ), comprising: a transition sleeve ( 5 ) having an inside surface comprising a first end passage and a second end passage, each of the first end passage and the second end passage comprising a terminal interior side surface ( 25 , 26 ) orthogonal to a length of the corresponding passage, the terminal interior side surfaces ( 25 , 26 ) of the first and second end passages being defined by end surfaces of an interior annular rib ( 20 ) projecting into the interior of the transition sleeve ( 5 ), the transition sleeve ( 5 ) connected, at the first end passage, to the insertion end ( 4 ) of the drilling tool ( 1 ) and having screwed into the second end passage a first end portion of the anchor rod ( 6 ) wherein, at least the first end portion of the anchor rod ( 6 ) which is screwed into the second end passage of the transition sleeve ( 5 ) has a section ( 12 ) with an end length having a diameter (Ra) tapered as compared to the outside diameter (Rd) of the anchor rod ( 6 ) such that between the inside surface ( 23 ) of the transition sleeve ( 5 ) and the section ( 12 ) of the anchor rod ( 6 ) there is an empty space ( 23 ), the section ( 12 ) of the anchor rod ( 6 ) has a end face ( 24 ) facing the terminal interior side surface ( 25 ) of the first end passage, the empty space is located adjacent the end face of the section, and the entire end length of the section ( 12 ) of the anchor rod ( 6 ) with the tapered diameter (Ra) is free of threads.