(57) It allows providing additional protection based on the incorporation of alarm means
to alert both visually and acoustically about the attempted manipulation and / or
forced opening of the lock, the security system being applied in locks that comprise
a box (1), a latch mechanism (2) and a cylinder (3) that has a key mechanism to operate
the latch mechanism (2), wherein said security system comprises: a fixed plate (10),
a movable plate (20) supported on the fixed plate (10), fixing means (30) of the fixed
plate (10) on the lock, moving means (40) of the movable plate (20), means of retention
(50) of the movable plate (20), and alarm means (60) configured to emit an acoustic
signal in the event of attempted tampering or forced opening of the lock.
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