Protective device for locks, especially for block-type locks of burglar alarm systems

摘要

In a protective device for locks, especially for block-type switching locks of alarm systems, with a mountable cover plate which contains a lock plate (30) rotatable in the latter and provided with a key slot (32a), the key slot being aligned, in the opening position, with a lock slot, located behind it and intended for receiving a key, and being rotatable by means of the latter, the lock plate is provided on the inside with at least one conductive circuit (79, 79i) which is assigned at least one pair of contact pins (55 and 56) connectable to an alarm system. <IMAGE>