Patent ID: 7850404
Filing Date: 2010-12-14
Classification: B23B,Y10S,Y10T

Abstract:
1. A drill chuck comprising: a chuck body rotatable about a chuck axis; a tightening sleeve axially fixed but rotatable about the axis on the chuck body; a plurality of jaws angularly spaced on the body about the axis and radially displaceable between inner and outer end positions; means including a screwthread formation for radially displacing the jaws between their end positions on relative rotation of the body and sleeve; an inner element rotationally fixed on the chuck body and having an elliptical outer surface generally centered on the axis; a flexible coupling ring engaged over the inner-element outer surface and having an annular array or radially outwardly projecting coupling teeth; a first ring fixed to the chuck body and having an annular array of radially inwardly projecting teeth meshing with the coupling teeth; a second ring rotatable about the axis relative to the chuck body adjacent the first ring and having an annular array of radially inwardly projecting teeth also meshing with the coupling teeth, the second-ring array of teeth having a number of teeth different from that of the first-ring array of teeth, whereby the elliptical outer surface engages the coupling teeth at diametrally opposite locations with the first- and second-ring teeth and relative rotation of the chuck body and the tightening sleeve angularly shifts the first and second rings relative to each other; and indicia on the rings indicating relative angular offset.