E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/042 (2006.01)
Patent
CA 2367747
A percussive drill for extension drilling includes a drill bit, a tube having a male screw thread attached to a female screw thread of the drill bit, and a rod having a male screw thread attached to a female screw thread of the tube. Central passages of the rod and tube are aligned with one another to conduct flushing fluid to the drill bit. The drill bit drills a hole whose diameter is from 60-170 mm and at least twice the outer diameter of the rod. A total area of a cross-sectional surface of the tube is within 100-125 % of a total area of a cross-sectional surface of the rod.
L'invention concerne un dispositif de forage à percussion comprenant un trépan, un tube ayant un filetage de vis mâle relié à un filetage de vis femelle de trépan, ainsi qu'une tige ayant un filetage de vis mâle relié à un filetage de vis femelle du tube. Des trous de passage centraux de la tige et du tube sont en alignement mutuel afin d'acheminer un fluide de rinçage jusqu'au trépan. Ledit trépan perce un trou dont le diamètre est compris entre 60 et 170 mm et fait au moins le double du diamètre extérieur de la tige. Une zone totale de la surface de section transversale du tube est comprise entre 100 et 125 % de la zone totale de la surface de section transversale de la tige.
Larsson Kenneth
Moren Rolf
Gowling Lafleur Henderson Llp
Sandvik Ab
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