Patent ID: 7201547
Filing Date: 2007-04-10
Classification: B23B,Y10T

Abstract:
1. A chuck actuator comprising: a hollow housing having a chamber extending along an axis and having a front end and a rear end and provided with front and rear axial abutments; a ring axially displaceable in the chamber between the abutments, forming with the front end thereof a front compartment, and formed with a bypass passage that is blocked by the rear abutment when the ring bears thereon; a piston in the chamber between the ring and the rear end and forming an intermediate compartment with the ring and a rear compartment with the rear end; an axially extending stem on the piston projecting forward through the ring and through the intermediate and front compartments, adapted to engage and open a chuck and knock a tool from it, and formed with a region of enlarged diameter, the piston being axially shiftable between a rear position with the enlarged-diameter region offset rearward from the ring and with the stem forming with the ring an axially extending passage between the front and intermediate compartments and a front position with the enlarged-diameter portion fitting snugly in the ring and substantially closing the passage; and means including ports opening into the compartments for