| 摘要 |
A door lock provided with a retractable and extendable bolt (4) is equipped with a normal lock cylinder (7), allowing normal bolt actuation, and a further lock cylinder (8), namely a so-called emergency cylinder, which, only in an emergency, allows the bolt (4) to be actuated by a switching member (19) which can be changed over by means of an electromagnet (16). The switching member (19) can be locked automatically in its switching position corresponding to the emergency mode and be returned to its normal position by the key actuation of one lock cylinder and by the bolt movement thus caused. In order to allow a reliable change-over of the door lock from its emergency position to the normal position by constructionally simple means, the switching member (19) is to be disengaged from its emergency position by the normal subsequent actuation of the normal cylinder (7) and by the extension movement of the bolt (4) brought about thereby, whereupon the switching member (19) is to be returned to its normal position by means of a return spring (27) engaging on it. The switching member (19) is advantageously designed as an L-shaped blocking lever which possesses a catch recess (23), cooperating with a catch pin (24) arranged fixedly relative to the housing, and a control edge (19<IV>) which cooperates with a control pawl (30) present on the bolt shank (5). <IMAGE>
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