security AB-key lock for door
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Anti-X-key's AB-key lock.
A lock or A door controlled by different keys in different scurity levels, X-key or tools can not open it.
Different keys can control one lock. There are A-key, B-key and C-key etc. In a door, A-key controls one part of the tongues; B-key controls two parts of the tongues, include A-key's; C-key controls all of the tongues, include A-key's and B-key's.
If the door closed by force or wind, it can be opened by A-key or B-key or C-key, it also can opened by handspike; If the key mislay in home, it also can be opened by specialized work with some tools.
When the door locked by B-key, it can be opened by B-key or C-key, A-key can't open it. And specialized work or thief is very difficulty open it by special tools.
When the door locked by C-key, it can only opened by C-key, the A-key and B-key can't open it. And specialized work or thief can't open it by special tools.
A-key can used to a decorator, B-key can used to a house hirer. C-key can used to a house owner.
It can be produceed in to many kinds and types , such as night lock or magnetic combined lock or keyhole encoder lock or key coding lock etc. . . , easily manufacture, conveniently use and more safely.
Chinese patent No:012724858, 200320110001.9, 200420079073.6, 200420079608. x , It could produce out about 100 kind locks and relative products.
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