Patent ID: 7503565
Filing Date: 2009-03-17
Classification: B23B,Y10T

Abstract:
1. A drill chuck comprising: a chuck body centered on and rotatable about a chuck axis and formed with an annular row of radially outwardly directed teeth; a sleeve axially fixed but rotatable about the axis on the chuck body and formed with a plurality of angularly spaced guides; respective jaws radially displaceable in the guides; means including a screwthread formation for displacing the jaws radially toward each other on rotation of the sleeve in a tightening direction on the body and for displacing the jaws radially apart on rotation of the sleeve in an opposite loosening direction on the body; a pawl pivoted on the inner sleeve and having a tip radially displaceable between an inner blocking position engaging the body teeth and preventing rotation of the sleeve on the body in the loosening direction and an outer freeing position clear of the teeth and permitting such rotation, the teeth being angled and engaging the pawl in the blocking position so as to allow rotation of the sleeve on the body only in the tightening direction when in the inner blocking position while permitting rotation of the sleeve on the body in both of the directions in the outer freeing position; spring means braced against the pawl and urging the pawl into the inner blocking position; an actuating ring immediately axially adjacent the sleeve and rotatable on the body independently of the sleeve about the axis in the tightening direction and in the loosening direction between a pair of angularly offset end stop positions, the ring being in one of the end positions when rotated to a stop in the loosening direction and the other of the end positions when rotated to a stop in the tightening direction; and means including a cam inside the actuating ring and having a cam formation engageable with the pawl for shifting the pawl into the freeing position on rotation of the actuating ring in the loosening direction into the one of the end positions and for shifting the pawl into the blocking position on rotation of the actuating ring in the tightening direction into the other of the end positions.