Abstract: In a first embodiment thereof, the locking means comprises an axially-translatable bolt slidably disposed within a cylinder. The cylinder has an axially-extended slot formed therein, and a pin fixed in the bolt projects therefrom, through the slot, to engage a camming slot formed in a sleeve which envelops the cylinder. A hollow cap-actuator envelops the camming-slotted sleeve, and a drive rib formed in the cap-actuator engages an axial separation in the sleeve to cause (a) the sleeve to rotate, when the cap-actuator is turned, (b) to cause the pin to travel along the camming slot, and (c) to effect extension and retraction of the bolt.

Abstract: In the embodiment shown, the chuck comprises a hub rotatably journalled in a jaw carrier, and the latter rotatably journalled in a body. The carrier pivotably mounts a plurality of jaws having camming surfaces, and drive pins upstanding from the hub and the body slidably engage the camming surfaces to move the jaws outwardly, to engage the inner surface of a workpiece, or inwardly, to engage the outer surface of the workpiece. A screw carried in the jaw carrier is movable into the hub, to lock the hub and jaw carrier together, and movable into the body, to lock the body and the jaw carrier together. In the prior circumstance, the drive pins of the body are operative to move the jaws inwardly or outwardly; in the latter circumstance, the pins of the hub are operative to move the jaws as noted above. The jaws have a first plurality of camming surfaces for operative engagement with the drive pins in the body, and a second plurality of camming surfaces for operative engagement with the drive pins in the hub.