A, B lock is a new type of anti-theft lock, which is mainly designed with the theme of owner safety.
1. The A key is provided to the decoration installer.
2, B key with plastic packaging, this key in addition to the owner, other people can not open the seal to give the owner a safe guarantee.
3. After the installation is completed, the owner will take back the A key after acceptance, and then use the B key to insert the lock cylinder to rotate 360 ​​degrees, and the A key will automatically fail.
4, the owner should not try to open with a B key before use
AB lock principle:
First, the difference between AB two keys and the working principle of the lock
1. For the sake of easy distinction between the manufacturers, the 6 B keys are packaged in a transparent hard case, and the 2 A keys are hung outside. Some A and B keys have different colors. The 2 A keys are yellow and the 6 B keys are white. There are instructions on the back of the 6-B key package. The owner should read it clearly before use, and recognize the use of the two keys. Do not confuse them to avoid improper use of the two keys.
2. If the two keys of AB are closely observed, experienced people will find that one of the seven pits above the key has a difference (the average person does not pay much attention to it, think that there is no difference between the two keys) . The deepest pit at a certain position on the A key, the shallowest (even flat, no pit) corresponding to this position on the B key, generally the position of the 7th or 1st marble. Speaking of the people I want to be here, I must have thoughts in my heart, so I will remind the homeowner that A key must be taken back after use and properly preserved or destroyed.
3. The marble structure in the marble chamber corresponding to the different depths of the A and B keys is special. A steel ball of φ1mm is placed between the upper and lower marbles. When using the A key, the height of the lower marble in the marble chamber plus the height of the small steel ball is just flush with the lock core, so the lock can be unlocked with the A key; when the B key is used, the small steel ball can be used. The top lock cylinder, that is to say, the lower bead and the lock core are flush, so the B key can also be twisted and unlocked (this principle is the same as the sub-key system), after the lock core is rotated by a certain angle, The small steel ball will be subjected to the action of the upper spring and fall into the blind hole that was previously designed on the lock core (this is different from the key system of the child). Some people call this small blind hole a trap, which is very appropriate. . The diameter of this blind hole is larger than that of the small steel ball, but it is smaller than the diameter of the marble. Otherwise, the falling of the marble will make the lock cylinder jam and cannot be unlocked. Once the small steel ball falls into the blind hole, it can only rotate with the lock core, and will not run out of the blind hole. It will not affect the use of the B key, but when the A key is used, there is no small steel ball, so the lower part of the marble chamber The marble cannot be flush with the lock core (the height of the small steel ball is different), and the lock cylinder cannot be unlocked.
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