| 摘要 |
<p>A tool (10) including a drive shaft (36) having an axis of rotation, and a plurality of bit holders (28,30) interchangeable with one another at a position of use. The bit holders (28,30) being mounted on a turret (26) which is rotatable around an axis (k) set at an angle to the axis of rotation of the drive shaft (36). The drive shaft (36) being in drive connection with a respective bit holder (28,30) at the position of use, wherein the tool (10) includes means (20x) for engaging a clutch (46) which activates a drive train (44) to establish a drive connection between the drive shaft (36) and the turret (26) so that subsequent operation of the drive shaft (36) rotates the turret (26) to interchange the positions of the bit holders (28,30) at the position of use, and wherein after the turret (26) has been rotated the clutch (46) is disengaged to deactivate the drive train (44) to prevent any further rotation of the turret (26).</p> |
