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Anonymous users2024-01-24The old-fashioned Panpan security door has two keys, one side lock and one middle lock, the two keys are not common to each other, the lock can be turned on and off by hand from the inside, but the key can be used from the outside. There is usually an anti-lock device in the door, if the device is locked, it cannot be opened with a key from the outside of the door, and can only be manually controlled from the inside of the door.
It may be damp or water, so that the lock cylinder machinery is frozen and locked; It is recommended to do a good job of thermal insulation and waterproofing of the interior and exterior doors; Hope it helps.
See if the lock is broken, find a master to see if you need to change the lock core.
It can be opened, and it is called abnormal if it cannot be opened.
The outer door is long on the outside, the inner door is long on the inside, if the lock cylinder is the same length at both ends, the engineering end is facing the exterior on the line, if there is no engineering end, the lock cylinder in the middle is not divided into which end.
No. If the security door is locked indoors, the key can be used outside the door to open the security door, but if the key is locked indoors, the key is rotated 90 degrees and the key is not removed, in this case, the security door cannot be opened even if the key is used outside the door. >>>More