Anti-burglar protection of cylinder lock-operated slide bolt lock - has hardened bushing over cylinder lock withdrawable into unlocked position only through narrow slot for key

摘要

The sliding bolt (10) attached to the wing of the door to be locked has an opening (11) penetrated by the body (9) of the cylinder lock in locked position. In this position the retention lug (8) projects from the body of the cylinder lock and engages in recess between plate (6) and (2). The cylinder lock body is accommodated in a housing (7) which is covered a second hardened housing (4) with a neck part containing bushing (15) which accommodates the full length of the cylinder lock after the retention lug (8) has been withdrawn by using the slim key (14). ADVANTAGE - The cylinder lock can be operated only through a narrow slot in the hardened casing, all other mechanical access to the lock is prevented.