| 摘要 |
Safety unit comprising a stator 1 and a rotor 3 capable of being driven in rotation relative to the stator by means of a key 6 provided at its end with notches 7 corresponding to the combination of the lock, and means for blocking the rotation of the rotor 3 in relation to the stator 1, the action of which is cancelled by the insertion of the key, characterised in that it comprises, furthermore, additional means for blocking the rotation of the rotor in relation to the stator, which are formed by at least one movable piece 10 arranged in an axial orifice 9 of the rotor and engaged into a corresponding receptacle 12 of the stator 1 under the action of an elastic member 11, a washer 15 equipped with at least one dog 14 for actuating the movable piece being displaceable axially by means of a projection 17 provided for this purpose on the key. <IMAGE>
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