Driver

Details Driver Driver

E - Fixed Constructions

21

B

E21B 4/06 (2006.01) E21B 4/20 (2006.01) E21B 17/046 (2006.01)

Patent

CA 2470211

A driver or dogging element adapted to transfer torsion forces between a rotating outer tube (10) and a drill bit (1) of a down-the-hole hammer, wherein the dogging element (7) is made of a softer material than those parts (3, 4) of the drill bit (1) that co-act with the dogging element (7, 8).

L'invention concerne un élément d'entraînement ou de serrage conçu pour transférer des forces de torsion entre un tuyau externe rotatif (10) et un trépan (1) d'un marteau fond de trou. Cet élément de serrage (7) est constitué d'une matière plus souple que les parties (3, 4) du trépan (1) qui coopèrent avec l'élément de serrage (7, 8).

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