The biopsychology of mood and arousal

A drill chuck having a body on which a sleeve is mounted for rotation thereon but held against axial movement. Jaw means are supported in the body and movable to open and closed positions in response to rotary movement of the body. The body has an annular threaded groove enclosed by the outer end of the sleeve. Pilot holes are formed on opposite sides of the sleeve in superposition to the threaded groove in the body so as to expose diametrically opposite sides of the threaded groove having oppositely slanted threads. Insertion of a key or bolt to a bottoming condition in the pilot hole and rotating the same will cause the body to rotate and, depending on which pilot hole is being utilized, will cause the jaws to open or close. The key is turned in the same direction regardless of which pilot hole is used.