Rotary drill chucks

Details Rotary drill chucks Rotary drill chucks

B - Operations, Transporting

23

B

255/54

B23B 31/16 (2006.01) B23B 31/14 (2006.01)

Patent

CA 1231090

ABSTRACT A rotary rock drilling chuck has three jaws for clamping a drill stem. Each jaw is carried by the step of a piston acting in a cylinder against belleville springs between it and an end cap. A projection from the piston passes through the belleville springs. Three pairs of masses are equally and circumferentially spaced about the clamping axis and acted upon by levers pivoted to the chuck body so that a mass acts upon a pair of levers each of which acts upon a piston to counteract centrifugal force acting on the piston.

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