Patent ID: 8061719
Filing Date: 2011-11-22
Classification: B23B,Y10S,Y10T

Abstract:
1. A drill chuck comprising: a chuck body centered on and rotatable about an axis and formed spaced angularly around the axis with a plurality of angled guides; respective jaws slidable in the guides axially forward and radially toward each other and axially rearward and radially away from each other; an annular tightening element limitedly axially shiftable on the body between a front position and a rear position; screwthread formations engaged between the element and the jaws for axially displacing the jaws forward on rotation of the element in a tightening direction and for axially displacing the jaws rearward on rotation of the element in a loosening direction; and respective annular arrays of teeth angularly fixed on the element and the body, the arrays being interengaged and preventing relative rotation of the element and body in the rear position of the element and being spaced and permitting relative rotation of the element and body in the front position of the element.