E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/40 (2006.01) E21B 7/20 (2006.01) E21B 17/07 (2006.01)
Patent
CA 2075900
The present invention relates to a down-the-hole drill tool, said drill tool be- ing adapted to drill a hole in advance of a trailing casing tube (15), said drill tool in- cluding a central pilot bit (12) and a reamer means (14) and a guide means (17; 17'; 17"; 17"'; 17"", 37) for guiding the drill tool and said casing tube (15) relative to one another, and a shaft (11; 11'; 11"; 11"') that is adapted to be connected to a down-the-hole hammer (23). The invention also relates to a guide means and a one- piece unit per se. In known drill tools of the above-mentioned type the thread con- nection, e.g. between the guide means and the portion supporting the reamer, is the weak point. Therefore it is an aim of the present invention to present a structural de- sign of a drill tool of the type in question that avoids thread connections in portions of the drill tool that is subjected to high bending forces. The characterizing features of the present invention are that the shaft (11; 11'; 11"; 11"') and the pilot bit (12) is a one-piece unit and that the guide means (17; 17'; 17"; 17"'; 17"", 37) is deta- chably mounted on the sahft (11; 11'; 11"; 11"').
Asberg Bengt
Brungs Anders
Hedlund Jan-Gunnar
Jansson Kjell-Ove
Gowling Lafleur Henderson Llp
Sandvik Ab
Sandvik Intellectual Property Ab
LandOfFree
Down-the-hole drill tool for drilling in advance of a casing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Down-the-hole drill tool for drilling in advance of a casing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Down-the-hole drill tool for drilling in advance of a casing... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1508078