Device in rock drilling machines

Details Device in rock drilling machines Device in rock drilling machines

E - Fixed Constructions

21

B

255/50

E21B 3/02 (2006.01)

Patent

CA 1231089

ABSTRACT OF DISCLOSURE A device in rock drilling machines with a grip- ping device which is rotatably mounted in a non-rotating drilling head and intended to grip a drill string for transferring rotational and axial movements to it. The gripping device it hydrostatically mounted in the drill- in head, whereby the pressure in a pressurized fluid between their coacting bearing surfaces automatically increases for increased loading pressure between these surfaces.

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