20090022557 | AUTOMATED CHUCK EXCHANGE USING ROTATING TURRET - A tool including a drive shaft having an axis of rotation and a plurality of bit holders interchangeable with one another at a position of use. The bit holders are mounted at arcuately-spaced positions on a turret rotatable around an axis that is set at an angle to the axis of rotation of the drive shaft. The drive shaft is reciprocal between first and second axially-spaced locations at which, respectively, the drive shaft is engaged and disengaged from the bit holder at the position of use. The positioning of the drive shaft at the second location establishes a drive connection between the drive shaft and the turret so that subsequent operation of the drive shaft rotates the turret to interchange the positions of the bit holders at the position of use. The drive shaft is adapted to return to the first location and restore the drive connection with a new bit holder at the position of use after the turret has been rotated. | 01-22-2009 |