| 摘要 |
<p>In a power-driven tool, in particular an electric tool with a rotary-driven tool holder (4) and a switch-over device for switching between different operating conditions and/or modes, a first, rotatable coupling part (26) of the switch-over-device is provided with locking recesses (29) in which are positioned, serving as locking elements when coupled, roller bodies (30) which are held, non-displaceable circumferentially but movable radially and out of engagement with the locking recesses (29), in a second rotatable coupling part (27). The first and second coupling parts (26,27) are movable relative to each other between a first axial position, in which the roller bodies (30) engage with the locking recesses (29) by means of spring force, and a second axial position. In the second axial position, the roller bodies engage with a smooth rotating surface (28), axially offset with respect to the locking recesses (29), of the first coupling part (26). The locking recesses (29) and the roller bodies (30) form, in the first axial position, in addition to the coupling of first and second coupling parts (26,27), an overload coupling. <IMAGE></p> |
