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Anonymous users2024-01-24To be correct, it is the ABC key, 1 temporary key A for the contractor, 1 B key for destroying the temporary key function, and 5 C key for yourself. Of course, most of the security doors are only divided into AB keys, A keys for the contractor, and B keys that become invalid after using the A key. The principle is that the protrusion of the second key destroys the steel ball inside the door lock that the A key opens normally, so that the shape of the internal lock hole changes.
In addition, the more advanced locks on the market are: Wang Li anti-theft door, Frandi anti-theft door, Xingyueshen anti-theft door, Zhen'an anti-theft door, Panpan anti-theft door, Longjia anti-theft door, Buyang anti-theft door and so on.
The marble room in the pit corresponding to the different depths of the A (decoration key) and B key has a special structure and is equipped with a 1mm steel ball between the upper and lower marbles. When the A key is used, the height of the lower marble in the marble chamber plus the height of the small steel ball is just flush with the lock cylinder, so the lock cylinder can be unlocked by twisting the lock cylinder with the A key; When using the B key, just the small steel ball can be pushed out of the lock cylinder, that is to say, the lower bead and the lock cylinder are flush at this time, so the B key can also be twisted to open the lock cylinder (this principle is the same as the mother and son key system), but when the lock cylinder rotates at a certain angle, the small steel ball will be affected by the action of the spring spring, and fall into the blind hole that is cleverly designed on the lock cylinder in advance (this is the difference with the key system), some people call this small blind hole a trap, very appropriate. The diameter of this blind hole is larger than the small steel ball, but smaller than the diameter of the marble, otherwise the marble will fall and the lock cylinder will be stuck and cannot be unlocked. >>>More
Generally, the A key is used for decoration! It's two! After opening with the B key, the A key is invalid.
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The AB key of the anti-theft door can still be opened after the B key is used, which is not normal. >>>More
No, once the C key is inserted, the A key can no longer be used, and only the B key can be used.
Class B locks generally can't be opened, and can only be opened by chainsawing.