A drill bit assembly for fluid-operated percussion drill tools

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/14 (2006.01)

Patent

CA 2615618

The invention relates to a drill bit assembly for fluid-operated percussion drill tools comprising a percussion bit (1) having a head portion (3) formed with an axially extending stub shank (32). The stub shank is provided with axially extending splines (36), which are slideably engageable with complementary splines (35) formed on a drive chuck (4). Rotational drive from the chuck (4) may be transmitted to the stub shank (32) by means of the splines. Bit retaining means (6, 7, 41, 42) at the chuck are adapted for engagement with complementary retaining means (37, 51) at a spline portion of the stub shank to retain the stub shank in the drill bit assembly. Engagement means on the chuck (4) are adapted for connecting the chuck (4) to a drive means (5) of the fluid- operated percussion drill tool. The invention also relates to a down-the-hole hammer comprising an external cylindrical outer wear sleeve (5), a sliding piston (8) mounted for reciprocating movement within the outer wear sleeve (5) to strike a percussion bit (1) of a drill bit assembly located at the forward end of the outer wear sleeve (5) wherein the drill bit assembly is an assembly as described above.

La présente invention concerne un ensemble de trépan pour des outils de forage à percussion à commande hydraulique comprenant un trépan à percussion (1) ayant une partie de tête (3) formée avec une tige de pilier extensible (32). La tige de pilier est composée de cannelures s~étendant axialement (36), qui s~engagent de façon coulissante avec des cannelures complémentaires (35) formées sur un mandrin d~entraînement (4). L~entraînement rotatif depuis le mandrin (4) peut être transmis à la tige de pilier (32) par l~intermédiaire des cannelures. Des moyens de retenue du trépan (6, 7, 41, 42) au mandrin sont adaptés pour s~engager avec des moyens de retenue complémentaires (37, 51) à une partie de cannelure de la tige de pilier pour retenir la tige de pilier dans l~ensemble de trépan. Des moyens d~engagement sur le pilier (4) sont adaptés pour connecter le pilier (4) à un moyen d~entraînement (5) de l~outil de forage à percussion à commande hydraulique. L~invention concerne également un marteau de fond de puits comprenant un protecteur de tige externe cylindrique (5), un piston coulissant (8) conçu pour assurer le mouvement alternatif avec le protecteur de tige (5) pour frapper un trépan à percussion (1) d~un ensemble de trépan situé à l~extrémité avant du protecteur de tige cylindrique externe (5) dans lequel l~ensemble de trépan est un ensemble comme décrit ci-dessus.

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