Drill string holder

Details Drill string holder Drill string holder

E - Fixed Constructions

21

B

255/50

E21B 7/02 (2006.01) E21B 19/08 (2006.01) E21B 19/16 (2006.01)

Patent

CA 1064899

ABSTRACT OF THE DISCLOSURE A drill string holder for a rock drilling machine has two jaws opposite each other for gripping a drill string e.g. the drill string in core drilling with a diamond drill bit. The jaws are forced into their gripping positions by means of a heavy spring. A first selectively actuatable hydraulic piston is arranged to overcome the spring and permit the jaws to release their grip. A selectively actuatable second piston is located in- side the first piston. By means of the second piston, the operator can apply a selectively variable force to the jaws when the jaws are released from the spring. This permits the operator to let the drill string gently down into the bore hole by applying a controlled braking force on it.

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