Nowadays we can see combination locks on the doors of almost any entrance. At their core, they are not one hundred percent reliable, but still help keep the entrance clean and prevent outsiders from entering it.
Combination locks differ in principle of operation, device and, accordingly, cost. They are mounted and built-in, mechanical and electronic. In order to open the combination lock, it is necessary to enter in a certain way (most often using the keyboard) the code sequence stored in the secret of the lock. Such locks have both pluses and minuses in comparison with conventional ones. Among the pluses, one can single out the lack of
your keys that tend to get lost at the most inopportune moment. If relatives or friends come to visit you, there is no need to make duplicates. Also, the pluses include the ability to change the code if there is a suspicion that the old code has become known to strangers. The downside is that the code can be simply forgotten or it can be spied on by an outsider. Undoubtedly, the disadvantages include the fact that with frequent typing of the same code, the buttons are overwrittennumbers, and a likely attacker can easily take advantage of this. For this reason
th codes should be changed as often as possible.
Mechanical combination locks are most often found on the doors of buildings. This is due to their simple design and relatively high reliability. These locks are made of high quality steel. Unlike electronic locks, they do not depend on electricity, and also have practically no mechanisms that can break. Inside there are cylinders, which, after dialing the code, line up in a certain sequence, and the door opens. After opening the door, it is enough just to close it behind you, such a lock will lock automatically (if you have an auto-closer, you don’t even need to do this, the door will close itself).
Another variety are electronic combination locks. They are also used on building doors along with mechanical ones, but are more expensive due to the use of modern microprocessor technology. Unlike mechanical combination locks, in electronic ones the 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 a keyboard. They are considered more advanced, as they have a number of additional features, such as keyboard backlighting or opening the door with a special card, but there are also a few nuances to consider with them. Firstly, such a castle must be protected from the weather (in no casewater must get in), and secondly, for normal operation, it
need constant power supply.
A separate type of combination lock is a padlock. It is a simple-looking padlock that has several wheels (usually 3-4) for dialing the appropriate code. Due to this, it is more reliable than a conventional padlock, but still less reliable than a built-in one, since the steel shackle can be cut off. Most often, these locks are used to close garages, closets or utility rooms.
