| 摘要 |
High security lock device comprising a spring bolt mechanism and at least one locker bolt which are actuated by virtue of an electric motor by means of a linkage, opening and closing of which are controlled by means of an electric circuit for supplying the motor provided with a plurality of contacts actuated by the linkage, of a contact actuating device mounted in the jamb lining and of devices for decoding and command respectively. This device further comprises a relay 21 whose contacts a, b, c control the passage of current towards the motor 16 and whose winding is excited to reverse, by tilting of its contacts, the polarity of the supply voltage of the motor in order to make it rotate in the opposite direction in the case of locking brought about by jamming of the lock bolts during closure, or to obtain opening. <IMAGE>
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