What is the difference between key and key
The security is guaranteed. After the anti-theft key is used, the decoration key is invalid, and the key hole is changed. Generally, the decoration key is called the A key, and the official key is called the B key.
The diameter of this blind hole is larger than that of a small ball, but smaller than the diameter of the marble. Otherwise, the falling of the marble will cause the lock core to be jammed and cannot be unlocked. The small ball once fall into the blind hole only with the rotation of the lock core, not out of blind hole, have an impact on the use of B key can not, but use the A key because there is no small ball, so the ball billiard room is not flush with the lock core (a difference of small ball height), is not screwed unlock the lock core.
. The billiard structure in the billiard room with different depths of A and B keys is special, and a 1mm steel ball is arranged between the upper and lower billiard balls. When using the A key, the billiard room in the height of the billiard ball with small height just flush with the lock core, so use the A key can turn the lock core lock; when using the B key, it can be a small ball out of the lock core, that is to say when the bead and the lock core is flush, so B still can turn the key lock core lock (the principle and master key system, can do) when the lock core rotates a certain angle, the small ball will be on the cylinder under the action of the spring and fall into the blind hole on the lock core in advance of ingenious Design (which is with different point system in the picture, a key department) called the small blind hole traps, very appropriate.
