Drill chuck for smooth- and hex-shank bits

A drill chuck comprising:

• a chuck body centered on and rotatable about a chuck axis and formed with an axially forwardly open tool recess, a plurality of angled guide passages open into the recess, and a pocket open radially inward into the recess;
• respective jaws displaceable in the guide passages into and out of advanced positions projecting into the recess;
• a mechanism on the chuck for displacing the jaws into their advanced positions for gripping a smooth-shank bit in the recess;
• a socket formed centered on the axis with an axially forwardly open polygonal-section seat, nonrotatable in the recess of the chuck body, and axially displaceable in the chuck body into and out of a tool-releasing position;
• and
• a latch radially displaceable in the socket in the tool-releasing position of the socket between an inner retaining position projecting radially into the seat and an outer freeing position clear of the seat and projecting radially into the pocket, the latch being aligned radially with the pocket only in the tool-releasing position, the chuck body engaging the latch and forcing it into the inner retaining position except when the socket is in the tool-releasing position, whereby a polygonal-section shank of a tool formed with a radially outwardly open cutout can be fitted to the seat when the socket is in the tool-releasing position and is retained by engagement of the latch element in the cutout when the socket is not in the tool-releasing position;
• and
• a lock member radially displaceable in the chuck body between a locked position engaging the socket and preventing movement of the socket into the tool-releasing position and an unlocked position allowing movement of the socket into the releasing position.