Code locks on the doors of entrances - protection from unwanted guests

Nowadays, on the doors of almost any entrance, we can see code locks. In essence, they are not 100% reliable, but still help keep the entrance clean and prevent the penetration of strangers.

Code locks differ according to the principle of operation, the device and, accordingly, the cost. They are hinged and recessed, mechanical and electronic. In order to open the combination lock, it is necessary to enter the code sequence stored in the lock secret in a certain way (most often with the help of the keyboard). Such locks have both pluses and minuses in comparison with conventional ones. Among the advantages can be identified lack of Keys that have the property of getting lost at the most inopportune moment. If relatives or friends visit you, there is no need to make duplicates. Also, the pluses include the possibility of changing the code, if there is a suspicion that the old code has become known to strangers. The downside is that the code can be trivial to forget or it can be seen by an outsider. Undoubtedly, it's worth mentioning that when typing the same code frequently on buttons, numbers are erased, and a likely attacker can easily take advantage of this. For this reason You should change it as often as possible.

On the doors of buildings, one can often find mechanical code locks. This is due to their simple design and relatively high reliability. Such locks are made of high-quality steel. Unlike electronic locks, they are not dependent on electricity, and also have virtually no mechanisms that can break. Inside there are cylinders, which after the code set are aligned in a certain sequence, and the door opens. After opening the door, it's enough to just cover it behind you, this lock will snap automatically (if you have an auto-tutor, you do not even need to do this, the door closes itself).

Another kind are electronic code locks. They are also used on building doors along with mechanical ones, but are more expensive due to the fact that they use modern microprocessor technologies. Unlike mechanical code locks, the electronic code sequence is stored in the memory of the electronic device. They also lack bulky cylinders and buttons. They are replaced by a miniature optical panel and keyboard. They are considered more progressive, as they have a number of additional functions, such as, for example, lighting the keyboard or opening a door with a special card, but they also need to take into account several nuances. Firstly, such a lock should have protection from the weather (in no case should water enter), and secondly, for normal operation it Need a constant supply of electricity.

A separate type of code locks is a padlock. It is a conventional padlock with several wheels (usually 3-4) for dialing the appropriate code. Due to this, it is more reliable than a conventional padlock, but it is still less reliable than a built-in lock, as a steel shackle can be cut. Most often, these locks are used to close garages, closets or sub-stakes.