DEVICE FOR LOCKING AND UNLOCKING OF HIGHER SECRECY AND RELIABILITY Russian patent published in 1996 - IPC

FIELD: lock production. SUBSTANCE: device has at least two locks. Each lock has a hasp, hasp transposition mechanism. Slots for key placing are originated in cases of the locks. Lengthwise axes of the key slots of both locks are coincided with a single axis. Key slot of the first lock is through and comes up to key slot of the second lock. With keys turned around their lengthwise axis in the transposition mechanism maximum linear dimension of key slot of the second lock is smaller than minimum cross wise size of key slot in the first lock. With keys moved along lengthwise axis of the transposition mechanism cross wise dimension of key slot of the second lock are smaller than that of key slot of the first lock. EFFECT: high reliability. 5 cl, 4 dwg