HIGH-SAFETY COMBINATION LOCK Russian patent published in 1995 - IPC

FIELD: light industry. SUBSTANCE: lock can be used on outer and inner doors of residential and public buildings, garages, various safe cabinets and metal lockers. Lock comprises casing 1 with key guide 2, locking plate 4 with fixing post 7 and two-bit key 13 with secret devices on bits which differ from secret devices on bits of first key 12. Code lugs 9 and 10 in notches 11 of levers 8 are made in at least two groups with different combinations in height, corresponding to the secret devices on the bits of the last key 13 when the latter is turned half a revolution while unlocking the door. The last key 13 is fixed so that it cannot be withdrawn from guide 2. EFFECT: higher secrecy and reliability of lever-type locks. 3 cl, 2 dwg