Door lock "crab" - a mechanical system that allows you to lock the door. It consists of a castle and crossbars. The latter are connected to the former by means of special rods. What are crossbars? They are rods made of metal.
Crossbars are able to move perpendicular to the border of the door frame and leaf, moving to the lower and upper parts. The process of closing the door is carried out horizontally and vertically.
A little about the lock system
In order for the crab lock to be more reliable, deviators are used. Developers install them on the drive. In the people they are called repeaters. It is these details that serve to ensure that the crossbars move through metal rods. These movements will activate the lock.
How to manage deviators? This is done both from cylinder locks and lever locks. Even with this, it is best to use the second option with two drives. During the operation of such a model, a person will not spend too mucha lot of effort to open the door. The "crab" lock works in such a way that it connects the metal door to the wall. That is why you should not be afraid that an attacker will be able to gain access to an apartment or other premises.
Most often this type of lock is installed on armored and metal door leafs. Even with the use of special equipment, it will be difficult to open the product even for employees of the Ministry of Emergency Situations.
Dignity of castles
Existing crossbars are considered stiffeners. This not only increases the strength of the door, but also provides maximum protection against intruders. Due to the presence of multilateral locking, it will be difficult to open the front door even with special tools. The vertical locking rods provide security just like the horizontal ones.
Disadvantages of locks
Due to the fact that we are talking about multi-sided locking, the door puts a load on some parts of the lock product. Because of this, it wears out quite a lot. Therefore, when choosing a particular model, you need to find out its approximate service life in order to understand when it will fail. This factor depends on the quality of the assembly and the strength of the materials of all parts. If the “crab” lock fails in the locked state, then it will be very difficult to open the door. You need to understand that, most likely, you will either have to remove the door, or cause significant damage to it and the walls.
Not even all manufacturers are involved in the installation of the described lock, so you shouldunderstand all the subtleties of the setting as clearly as possible. It requires precision and scrupulousness. It is best to contact specialists to avoid mistakes. Even with minimal trouble, the lock can be difficult to operate and break quickly.
Technology Features
Everyone understands that the reliability and quality of the lock determines the duration of use of the product. It must be understood that if additional deviators and traction are used, the resistance to break-ins will remain at the same level. Why is this happening? Not a single attacker will cut the deviators, his actions will be aimed at cracking the lock itself. When the latter is opened, all other locks are automatically deactivated. Therefore, you need to pay attention to the reliability and security of the lock, then security is provided to any person.
If the lock is installed poorly, then even when using the most expensive models, they will only show themselves from the worst side. What is happening? There may be gaps between the frame and the door leaf. This will entail easy penetration of the attacker - he will be able to bend the door with crossbars. Unfortunately, it will be quite difficult to get the rods into the box, the reliability will be at a low level. It is very difficult to repair a system that is installed correctly and on a high-quality door when a breakdown occurs. Of course, it all depends on how serious the problem is. However, you need to prepare for this, since a person in the event of a similar situation will most likely have toinstall a new door structure.
Additional nuances
Quite often, the "crab" is used as a garage lock. Many buyers in the reviews write that the product is installed without problems and lasts a fairly long period of time. The lock is easy to use, does not often break or stick, and still provides excellent protection against burglaries in the garage.
In residential buildings, such systems are rarely used, but the "crab" could well be the best option. For example, in an unguarded entrance, it will ensure maximum security for the residents of the apartment.
Quite the product is suitable as a lock for a garage or hangar, which is located away from busy areas. This "crab" system is considered an excellent solution when it becomes necessary to protect private houses or other buildings that are not installed where a large flow of people passes. We are talking about warehouses where products are stored. Usually in such cases, protection must be at the highest level, so many shops and shopping centers use this type of lock.
Results
You must understand that it is impossible to ensure 100% security with only one lock. Of course, complex solutions should be used. They will make the door structure as reliable and efficient as possible. The “crab” lock, of course, is not easy to install, but if everything is done correctly and conscientiously, then it will be able to perform all its functions at the highest level without letting the owner down. Based on the above, one canthe conclusion is that such a lock is a reliable defender of the premises. Enjoy!
