Abstract: A tool chuck has a plurality of inclined chuck claws mounted centrally of a forward end of a chuck body to be slidable toward and away from one another, a nut ring meshed with the chuck claws and rotatable to screw-feed the chuck claws toward and away from one another, and a torque amplifying mechanism interposed between the nut ring and a control ring fitted to an outer peripheral surface of the chuck body, whereby the control ring is turned directly by hand to cause the chuck claws to hold a tool. A torque limiter is incorporated into the torque amplifying mechanism for allowing the tool to be clamped by a force not exceeding a predetermined value. Excessive tightening of the tool is thereby avoided so that the tool is removable when desired, and at the same time the above torque limiter is formed compact.

Abstract: A tool chuck suitable for use with manual or powered impact drivers is described. The chuck comprises a body which carries a rotatable nut and a plurality of slidable jaws, driven by the rotatable nut. An anti-friction bearing is disposed between the rotatable nut and a bearing thrust ring mounted on the body. The bearing thrust ring has a plurality of detents and may cooperate with a compression spring to prevent the chuck from loosening during operation.

Abstract: A drill chuck has 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 an axially forwardly directed shoulder. Respective jaws displaceable along the guides in the chuck body are each formed with a row of teeth and a tightening sleeve rotatably surrounds the body and has an axially rearwardly directed shoulder. An inner ring rotatable on the body about the axis is formed internally with a screwthread meshing with the teeth of the jaws so that rotation of the inner ring in one direction moves the jaws radially together and opposite rotation moves them radially apart. This inner ring bears axially forward on the shoulder of the sleeve and axially backward on the shoulder of the body. Interengaging formations rotationally couple the inner ring to the sleeve and a retaining element axially fixed on the chuck body forward of the inner ring bears axially backward on the sleeve.

Abstract: A drill chuck has a chuck body centered on and adapted to be rotated about a longitudinal axis and formed with a plurality of forwardly open angled guides angularly spaced about the axis, respective jaws displaceable along the guides in the chuck body and each formed with a row of teeth, and a tightening collar rotatably surrounding the body, formed internally with a screwthread meshing with the teeth of the jaws, and forming with the chuck body an annular space axially forward of the screwthread so that rotation of the collar in one direction moves the jaws radially together and opposite rotation moves them radially apart. A locking element axially displaceable in the space and nonrotatable on the chuck body is biased backward into axial engagement with the tightening collar to brake rotation of same.