Composite extender rod for out-of-the-hole hammer drilling

E - Fixed Constructions – 21 – B

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E21B 17/04 (2006.01) E21B 17/00 (2006.01) F16B 7/04 (2006.01)

Patent

CA 1053220

PRECIS DE LA DIVULGATION : Nouvelle tige allonge composite destinée à l'accou- plement de l'outil de forage et du marteau se situant en dehors du trou, forage exécuté en toute direction dans des travaux souterrains ou à ciel ouvert, caractérisée en ce qu'elle se compose d'un conduit central autour duquel sont disposées des tiges de haute résistance mécanique, l'ensemble étant gainé extérieurement et muni en ses extrémités de man- chons d'accouplement. La tige allonge est particulièrement adaptée aux techniques de forage actuelles comportant un marteau hors trou.

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