Cylinder lock key retainer, without affecting the normal operation of the lock

摘要

The present invention relates to a device for cylinder locks, capable of preventing the key from being withdrawn, without compromising the normal operation of the lock, said device consisting of a small pivot (1) sliding in a semicircular slot (4) made on the rear wall of the case (2) containing the bolt (3), in such a position that only one of its end-of-travel positions results in said pivot (1) being connected to the toe (6) of the cylinder of the lock, thus preventing the cylinder (7), which can pivot sufficiently to activate the bolt (3), from ever being capable of assuming the position which alone corresponds to the possibility of withdrawal of the key. IMAGE