Patent ID: 7845650

Claim:
A drill chuck comprising: a chuck body centered on and rotatable about an axis and formed with a forwardly open threaded bore; a holder sleeve rotatable about the axis on the body but axially generally nondisplaceable relative thereto and formed with a plurality of forwardly open angled guides angularly equispaced about the axis; respective jaws shiftable radially along the guides between an outer position in which the jaws are relatively widely spaced radially from each other and an inner position in which the jaws are closely radially spaced, each jaw being comprised of a body formed with a central radially inwardly open seat and a pair of faces angularly flanking the respective seat and a hard-metal insert fitted in the seat and formed with a radially inwardly directed tooth, each tooth and the adjacent flanking faces being so dimensioned and oriented relative to each other that in the inner position the flanking faces of adjacent jaws bear in surface contact on one another and the inserts are out of contact with one another, each tooth being formed with a radially inwardly open transverse slot subdividing it into two axially spaced parts; and a pusher threaded into the bore, bearing axially forward on the jaws, and angularly coupled to the jaws and holder sleeve, whereby relative rotation of the chuck body and pusher moves the jaws between their inner and outer positions.