| 摘要 |
A power chuck for turning machines, comprises a chuck body having an axis of rotation on which is slidably mounted a plurality of radially extending clamping jaws. Each clamping jaw is engaged with its own tangentially extending and slidable wedge bar. Each wedge bar is engaged with a radially extending push bar which is movable by an axially movable control member so that movement of the control member moves the push bar 1 in a radial direction and through the engagement thereof with the wedge bar and the engagement of the wedge bar and the clamping jaw, moves the clamping jaw in an opposite radial direction. The masses and transmission ratios of the push bar, wedge bar and clamping jaw can be selected to equalize the centrifugal force applied to the clamping jaw and push bar so that no excess force is applied to the clamping jaw when the chuck body rotates.
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