A drive sub for receipt of bit segments

Details A drive sub for receipt of bit segments A drive sub for receipt of bit segments

E - Fixed Constructions

21

B

E21B 10/66 (2006.01) E21B 23/06 (2006.01)

Patent

CA 2151275

A DRIVE SUB FOR RECEIPT OF BIT SEGMENTS A drive sub adapted for connection to a lower end of a ground drill, said drive sub comprising a tubular member provided with seating means formed circumferentially about an inner wall of said tubular member for seating cutting means of said ground drill in a cutting position, said seating means comprising a series of surfaces configured and juxtaposed so that cutting means can slide relative to said member when in said cutting position in response to said ground drill being lifted from and lowered onto the bottom of a hole being drilled by said ground drill.

La présente invention a pour objet un sous-ensemble d'entraînement destiné au raccordement d'outils de forage à l'extrémité inférieure d'un dispositif de forage, le sous-ensemble d'entraînement en question comportant un élément tubulaire pourvu de butées d'assise formées à la circonférence interne de l'élément tubulaire en question et servant d'appui aux outils de forage en question lorsqu'en position de forage, les butées d'assise en question comportant une série de surfaces dont la configuration et la juxtaposition permettent le coulissement relatif de l'outil de forage en question lorsqu'en position de forage en réponse à l'introduction et au retrait de l'outil de forage à l'intérieur d'un trou de forage creusé par l'outil de forage en question.

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