| 摘要 |
The chuck comprises a central part associated with jaws and furnished with peripheral gear teeth, a rotating part movable in rotation about the central part, and a clamping ring movable in rotation about the rotating part by a limited angular amount. The rotating part has an opening situated opposite the peripheral gear teeth and in which a locking finger is engaged which, actuated by the clamping ring, may pivot in a plane transverse to the chuck, while being guided by the walls of the opening. In the unlocked position, the finger is at a distance from the gear teeth, but, in the locked position, the finger is engaged in the gear teeth and allows the central part to rotate only to the right.
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