Drill bit

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/36 (2006.01) E21B 10/38 (2006.01) E21B 10/58 (2006.01)

Patent

CA 2447223

A drill bit (1) comprises, on its face, either only curved cutting edges (2) or a combination consisting of at least one straight cutting edge (2') and at least two curved cutting edges (2). The cutting edges (2,2') on the face of the drill bit (1) are arranged such that they start from the axis (4) of the drill bit (1) or end directly adjacent thereto. Three channels (10) start from a blind hole (5) serving to attach the drill bit (1) to an anchor rod of an injection boring anchor, and their openings (11) are not located in the area of the face of the drill bit (1) but are situated in the area of the lateral surface (13) of the same, said lateral surface conically expanding toward the cutting edges (2, 2'). The openings (11) of the channels (10) are placed in the area of concave recesses (12) of the lateral surface (13) of the drill bit (1) in such a manner that they are recessed with regard to the periphery of the face of the drill bit (1).

L'invention concerne une couronne de sondage (1) comportant au niveau de sa face d'about, soit uniquement des arêtes vives (2) cintrées, soit une combinaison d'au moins une arête vive (2') droite avec au moins deux arêtes vives (2) cintrées. Les arêtes vives (2, 2') situées sur la face d'about de la couronne de sondage (1) sont disposées de manière à partir de l'axe (4) de la couronne de sondage (1) ou à se terminer à proximité immédiate de la couronne de sondage. Trois canaux (10) partent d'un trou borgne (5) servant à fixer la couronne de sondage (1) sur une barre de commande d'un élément d'ancrage de forage par injection. Les embouchures (11) de ces canaux ne se situent pas dans la zone de la surface d'about de la couronne de forage (1), mais dans celle de son enveloppe extérieure (13) qui s'évase en cône en direction des arêtes vives (2, 2'). A cet effet, les embouchures (11) des canaux (10) sont disposées dans la zone de cavités (12) concaves de la surface de l'enveloppe extérieure (13) de la couronne de sondage (1), de sorte à se trouver décalées par rapport à la périphérie de la face d'about de la couronne de sondage (1).

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