Patent ID: 6860488

Claim:
A drill chuck comprising: a chuck body rotatable about a chuck axis and having a rear end adapted to fit with a drive spindle and a front end formed with a tool recess; a plurality of jaws angularly spaced on the body about the axis, exposed in the tool recess, and radially displaceable relative to the body between inner and outer positions; a tightening ring axially fixed but rotatable about the axis on the body in a tightening direction and in an opposite loosening direction; coupling means including screwthread formations between the tightening ring and the jaws for moving the jaws radially together on rotation of the tightening ring in the tightening direction and for moving the jaws radially apart on rotation of the tightening ring in the loosening direction; a tightening sleeve surrounding the body, connected to the tightening ring, and adapted to be gripped by hand to rotate is the ring in the directions; a shield sleeve surrounding the body between the tightening sleeve and the body front end; and retaining means on the tightening sleeve supporting the shield sleeve on the tightening sleeve for rotation thereon about the axis independently of the body and of the tightening sleeve.