Earth boring apparatus

E - Fixed Constructions – 21 – B

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E21B 25/00 (2006.01) E21B 7/00 (2006.01) E21B 10/02 (2006.01) E21B 10/04 (2006.01) E21B 17/07 (2006.01) E21B 19/086 (2006.01)

Patent

CA 1116591

PRECIS DE DIVULGATION Dans les appareils de carottage pour creuser des trous dans le sol un outil de carottage est fixé à l'extrémité d'un arbre d'entraînement en rotation. Selon l'invention cet arbre est un cylindre d'un vérin hydraulique dont la tige de piston s'étend jusqu'à l'intérieur de l'outil de carottage et porte un plateau qui est muni d'une spirale et qui coulisse longi- tudinalement dans l'outil de carottage.

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