The term "invisible lock" unites group of the locking devices hidden at doors. From outer side of door it is impossible to find such lock, it has no keyhole.
For what invisible locks are necessary
The main function of any lock is to close door from uninvited guests reliably. To the normal mechanical lock any thief burglar will have master key, it is not necessary to look for such lock too (keyhole in sight). In several minutes it will be opened, so, the robber will get into the room and will take away what has come for. In case of the invisible lock the thief should take care not only of how to open the lock, but also to learn where it is in door.
Control of invisible locks
There is question how the owner will get home if there is no keyhole? The fact is that such devices generally radio control, as in car alarm outside open. The GSM module, in it the SIM card, as in the mobile device is built in the lock, for example. For such locks management via phone is possible. It is required to make call on the phone number SIM cards in the lock and if to its telephone directory such number is added to the list resolved, then the set action (unlocking, locking of door) takes place. The shortcoming is that you can lose, break phone or it can be stolen, and with it and number of the lock.
Other option is more popular and more convenient – it is required to put charm key, as in the intercom. In case of loss brelka the owner himself can reprogram spare brelka in a new way that found could not use old. Assemblers at installation of door will only show how to program key, they will not be able to open the lock the keys any more. Anyway such lock opens even without key for ensuring fire safety from within.
Installation and work
It will be ideal if the door initially contains such lock, in case of installation on the existing door there can be technical difficulties because of discrepancy of designs. Reliability of protection will be maximum if at doors there is both hidden, and mechanical lock. Operation of the invisible lock requires the power supply network. It is natural that in real life trouble-free the network does not work therefore locks are equipped with the uninterruptible power supply unit capable up to two weeks to provide autonomy and independence of external power supply. When choosing the producer you should not save, the safety in operation is important. It is recommended to make sure of the certificate on products, to examine exterior, to study features of operation even before installation and acquisition.