| 摘要 |
A chuck for holding a tool comprises a chuck support having a conical recess which accepts a conical clamping sleeve. A clamping nut carrying a freely rotatable ring is threaded onto the chuck support. The ring has means for engaging the chuck support in such a way to permit relative axial movement therebetween but no relative rotational movement. Shoulders on the clamping sleeve and the ring are so arranged that in one relative position axial movement therebetween is blocked while in another relative position the clamping sleeve can pass through the ring.
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