Liner lock

Soldier's knife with liner lock system

The liner lock is a locking and unlocking mechanism for folding knives . The rear end of the blade, which is in the handle, has a flattened edge. When the blade is fully opened, a spring attached to the handle and firmly connected to the knife engages. To unlock the blade again, the leaf spring must be pushed aside with the thumb so that the blade can be folded up with the other hand.