Importance

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Abstract

A power operated chuck for lathes comprises a chuck body which has a central bore with at least one groove radially extending from the bore in which a jaw is moved toward and away from the bore for clamping a workpiece in the vicinity of the bore. A receiving pocket is defined in the chuck body adjacent the groove and a key bar is movable in the pocket and has a serrated edge engaged with a serrated edge of the jaw along an engagement line which will effect shifting of the jaw and its associated groove during displacement of the key bar. The shifting element has a portion which engages the key bar for causing the displacement thereof in a controlled amount. The construction includes a free space defined in the chuck body adjacent the receiving pocket with a centrifugal weight therein which is associated with the key and is subject to the action of centrifugal force during rotation of the chuck and it is sized and located to direct a radial force against the jaw at the mating engagement surfaces with the associated key in an amount to compensate for centrifugal forces produced by the rotation of the chuck.

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First Claim