Limiting lock

• Main Author: LIZHU,ZHAO ZHAO
• Format: Patent
• Language: English
• Published: 16.08.2006
• Subjects: ACCESSORIES THEREFOR; FIXED CONSTRUCTIONS; HANDCUFFS; KEYS; LOCKS; SAFES; WINDOW OR DOOR FITTINGS

The utility model relates to a limiting lock matched with a rotary key line, which belongs to a novel mechanical burglarproof lock and aims to solve the problem of preventing technically unlocking the mechanical burglarproof lock. The utility model has the technical scheme that a key and a key slot adopts a thread matching structure; key teeth are coiled and evenly distributed on the rotary line of the tooth top of the outer threads of the key; marbles in a lock core, which correspond to the key teeth, hide along the interior of the tooth root of the inner threads of the key; the front end of the key is provided with a thread positioning unlocking cross-section which corresponds to a positioning pin of the lock core; a spacing pin is additionally arranged on the inner wall of a lock core sleeve, is matched with a corresponding spacing slot on the periphery wall of the lock core, and adds longitudinal spacing locking to the lock core; the rear end of the lock core is connected with an unlocking pulling pin. When the lock is to be unlocked, the key is rotated into the key slot and reaches a positioning point to finish the match with the marbles; when the key is pulled outwards, the lock core is driven to move and unlock the spacing locking; the rotation of the key can drive the lock core and the unlocking pulling pin to unlock the lock by rotation.