POWER DRIVABLE CHUCK

摘要

A body (52) of a chuck (30) has an axial opening (34) and three spaced radial slots (58) which receive locking fingers (68) extending radially inward from a circular band (66) located outside of, and rotatably on body (52). Band (66) and locking fingers (68) form a latching unit (64). A spring (70) is attached to latching unit (64) and to body (52) and normally urges each of the locking fingers (68) against one end of respective slots (58). A bit (36) with a shank (38) has axial grooves (42) which extend through a free end of shank (58). A transaxial groove (50) is located at a prescribed distance from the free end of shank (38). Slanted surfaces (44) on the free end of shank (38), inserted into opening (34), engage and cam locking fingers (68) into alignment with axial grooves (42), which allows shank (38) to be inserted further. Locking fingers (68) are prevented from returning to their original position until fingers (68) are aligned with, and biased into, transaxial grooves (50) to lock shank (38) with chuck (30).