Combined lockset capable of preventing unlocked by universal key

Abstract

The invention discloses a combined lock capable of preventing skeleton key from unlocking, characterized in that key inlet and outlet of the lock are provided on both ends, One or one more locking pieces are provided between key inlet and the outlet, the locking piece is provided with bullet hole, spring and bullet for opening-closing the locking piece, and bullet hole, spring and bullet for forward sliding of the key; There is provided with an angle between lock slot on sides of the up-down locking pieces to enclosing the keyhole. The lock of the invention is formed by combination of a plurality of locking pieces. An angle is provided between key shank grooves of each locking piece, when the lock pin is rotating during unlocking process, the keyhole is synchronously enclosed by using angle difference between key inlet and key shank grooves of each locking piece, thereby preventing skeleton key from unlocking. The key can be kept in the lock by utilization of reverse preventing pin between locking pieces and interior back locking structure, thus, the lost or formulated key can be found, which is safer.

Description

technical field [0001] The invention relates to a combined lock that can prevent a universal key from being opened, and belongs to the technical field of locks. Background technique [0002] In the prior art, the lock pieces of various pin locks used are usually composed of a set of lock body and lock cylinder. There are one or more sets of pins in the lock body and the lock core. Usually, the pins in the lock body are activated by the spring It is stuck in the lock cylinder, and the lock body pin stuck in the lock cylinder is pushed up by the key tooth, and the lock cylinder is turned to open the lock. Because its principle is similar, no matter how the structure of the tumbler group and the key changes, there is always a master key that can open the tumbler lock, so the anti-theft performance is poor. Even if the anti-theft door with multi-lock structure is installed, as long as the keyhole of each lock can be found, the locks can be opened one by one, but the effect of u...

AI Technical Summary

Problems solved by technology

Because the principles are similar, no matter how the structure of the tumbler group and the key changes, there is always a master key that can open the tumbler lock, so the anti-theft performance is poor

Even if the anti-theft door with multi-lock structure is installed, as long as the keyhole of each lock can be found, the locks can be opened one by one, but the effect of use is still not ideal.

At the same time, if the lost key or the same key is used by others to unlock the lock, if the lock is locked from the inside, although the key holder cannot unlock the lock, the key can still be taken away.

Once the indoor anti-lock is released, the key holder can still use the key to unlock the lock, which is less secure

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