Patent ID: 6921092

Claim:
A drill chuck comprising: a chuck body centered on and adapted to be rotated about a longitudinal axis and unitarily formed with a plurality of forwardly open angled guides angularly spaced about the axis and with a rim; respective jaws displaceable along the guides in the chuck body and each formed with a row of teeth; a metallic tightening sleeve rotatably surrounding the body; and a metallic threaded ring rotatable on the body about the axis within the tightening sleeve and formed with a screwthread meshing with the teeth of the jaws, whereby rotation of the ring in one direction moves the jaws radially together and opposite rotation moves them radially apart, the ring being formed with a radially outwardly open groove covered by the sleeve and being formed in the groove with transverse ridges, the sleeve being unitarily formed with an invardly projecting welt plastically deformed into the ridges in the groove, whereby the welt couples the ring to the sleeve.