Grapple attachment for use with drill pipes

Details Grapple attachment for use with drill pipes Grapple attachment for use with drill pipes

E - Fixed Constructions

21

B

E21B 19/14 (2006.01) E21B 19/08 (2006.01)

Patent

CA 2699728

A grapple attachment for use with a drill pipe having a diameter, that may include first and second gripping members disposed on a rigid lateral member tiltable up to 40 degrees from the horizontal and preferably continuously rotatable, wherein each of the first and second gripping members has a first and second claw and a bracket having a concave contact surface, each claw having a concave gripping surface, wherein the surface of the bracket and the gripping surfaces of the first and second claws come in contact with the drill pipe when the gripping member is in the closed position.

Cette invention concerne un accessoire formant grappin à utiliser avec une tige de sondage ayant un diamètre. Ledit accessoire peut comprendre un premier et un second élément de préhension disposés sur un élément latéral rigide apte à pivoter d'un angle pouvant atteindre 40 degrés par rapport à l'horizontale et de préférence apte à effectuer une rotation continue. Chacun desdits premier et second éléments de préhension comprend une première et une seconde mâchoire et un support ayant une surface de contact concave, chaque mâchoire comportant une surface de préhension concave. La surface du support ainsi que les surfaces de préhension de la première et de la seconde mâchoire entrent en contact avec la tige de sondage quand l'élément de préhension est dans la position fermée.

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