Principle of the lock:
Lock is generally composed of several parts such as lock cylinder, spring, spring, lock tongue, key and so on. Among them, the lock core is divided into the inner lock core and the outer lock core, the inner lock core is where you insert the key; copper bullet sub-bullet and outer bullet, cylindrical, different lengths; spring is mounted in the outer lock core in the round holes of the top of the bullets; tongue is to open the lock when the expansion and contraction of the part; key has a different height of the "flower" corresponding to different lengths of the bullet.
Knowledge Extension: