E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/10 (2006.01) E21B 1/00 (2006.01) E21B 10/38 (2006.01)
Patent
CA 2550801
A percussion rock drill comprising a drill string having in combination a drill rod, a drilling bit threaded on the end of said drill rod, and at least one ridged reinforcing drill string guiding sleeve sleeved on and bonded to the drill rod with the first sleeve located immediately next to the drilling bit. The sleeve has an outer cylindrical surface having a diameter substantially the same as but not larger than the diameter of a hole that the bit would cut under operation of the rock drill. The sleeve preferably has cuttings guiding passageways in its periphery which preferably are helically fluted.
Perforateur de roches à percussion comprenant une colonne de forage composée d'une tige de forage, d'un trépan vissé à l'extrémité de ladite tige et d'au moins une douille de guidage et de renfort de colonne striée enveloppant la tige de forage et scellée à celle-ci, la première douille étant montée juste à côté du trépan. Le diamètre de la surface cylindrique externe de la douille est quasiment identique - mais pas plus grand - à celui du trou que la tige devrait forer lors de la perforation de roches. Il est souhaitable que des canaux d'évacuation pour déblais de forage cannelés hélicoïdaux soient aménagés sur le pourtour de la douille.
Boart Longyear Inc.
Smart & Biggar
LandOfFree
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