Chuck with centrifugal force compensation

A chuck having a plurality of chuck jaws and a centrifugal counterbalance associated with each jaw, said centrifugal counterbalance comprising:

• a first lever pivoted about an axis;
• connecting means for connecting said first lever to an associated chuck jaw for moving said first lever and said chuck jaw in unison;
• a second lever pivoted about the same axis as the first lever;
• a ratchet formed in one of said first or second levers;
• a pawl disposed on the other lever and being spring biased toward engagement with said ratchet;
• a counterweight, engaging and movable with respect to said second lever, spring biased towards a stop position engaging and lifting said pawl from engagement with said ratchet, and being movable as the chuck rotates, away from the stop position allowing said pawl to engage said ratchet to move said first lever as said second lever moves.

A chuck having a plurality of chuck jaws and a centrifugal counterbalance associated with each jaw, said centrifugal counterbalance comprises:

• a first lever pivoted about an axis;
• connecting means for connecting said first lever to an associated chuck jaw for moving said first lever and said chuck jaw in unison;
• a second lever pivoted about the same axis as said first lever;
• latch means movable between a latched position, locking said first and second levers for movement together in one direction, and an unlatched position, permitting independent movement of said first and second levers;
• a counterweight movable from a stop position, engaging and moving said latch means to an unlatched position, to a position, not engaging said latch means and where said latch means is in a latched position, and movable outward under centrifugal force to apply force to said second lever which is transmitted thru said first lever to said chuck jaws providing centrifugal force compensation.