Earth boring cutter employing helical teeth

E - Fixed Constructions – 21 – B

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Details

E21B 10/16 (2006.01)

Patent

CA 2733563

An earth bit includes an earth bit body (151) and a lug (162) and cutting cone (100) carried by the earth bit body, wherein the cutting cone is rotatably mounted to the lug. A plurality of cutters (120, 130) are carried by the earth bit body, wherein the cutters include a cutter body (101) and a plurality of curved teeth (113) extending between opposed ends of the cutter body. The curved teeth are positioned so that one end of a tooth overlaps an opposed end of an adjacent tooth. The curved teeth of a first cutter extend in a direction around its corresponding cutter body and the curved teeth of a second cutter extend in an opposed direction around its corresponding cutter body.

L'invention concerne un trépan au sol qui comprend un corps de trépan au sol (151) et un tenon (162), et un cône rotatif (100) porté par le corps de trépan au sol, le cône rotatif étant monté de manière rotative sur le tenon. Une pluralité de dispositifs de coupe (120, 130) sont portés par le corps de trépan au sol, les dispositifs de coupe comprenant un corps de dispositif de coupe (101) et une pluralité de dents incurvées (113) s'étendant entre des extrémités opposées du corps de dispositif de coupe. Les dents incurvées sont positionnées de sorte qu'une extrémité d'une dent recouvre une extrémité opposée d'une dent adjacente. Les dents incurvées d'un premier dispositif de coupe s'étendent dans une direction autour de son corps de dispositif de coupe correspondant et les dents incurvées d'un second dispositif de coupe s'étendent dans une direction opposée autour de son corps de dispositif de coupe correspondant.

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