| 摘要 |
A tool (10) including a plurality of bit holders (26, 28) interchangeable with one another at a position of use in front of the tool (10). The bit holders (26, 28) being mounted at arcuately-spaced positions on a turret (24) rotatable around an axis (50) which is set at an angle to an axis (30) of rotation of a drive shaft (42). The drive shaft (42) being reciprocal between first and second axially-spaced locations at which, respectively, the drive shaft (42) is engaged and disengaged from a bit holder (26, 28) at the position of use. The positioning of the drive shaft (42) being such that at the second location a drive connection between the drive shaft (42) and the turret (24) is established so that subsequent operation of the drive shaft (42) rotates the turret (24) and interchanges the positions of the bit holders (26, 28) at the position of use. The drive shaft (42) being adapted to return to its first location and restore the drive connection with a new bit holder (26, 28) at the position of use after the turret (24) has been rotated. |
