Patent ID: 7371033

Claim:
A pistol-grip tool having first and second chucks one of which may be replaced by the other at a common driving position; a releasable device operable to disconnect a rotary drive shaft from the chuck at the driving position when the chucks are to be interchanged; a chuck-changing unit operable with drive obtained from a drill motor, after the releasable device has been released, to re-position and then to turn it about the drive shaft axis to occupy a position in front of the pistol-grip bringing the second chuck from a position in front of the pistol-grip to the common driving position; and a mechanism operable by the same hand of the tool user as is holding the pistol-grip, to initiate operation of the chuck-changing unit and the disengagement and re-engagement of the releasable device so that the drive from the drive shaft is only imparted to the chuck at the driving position when the other chuck is occupying a position in front of the pistol-grip of the tool.