Door lock "crab" - a mechanical system that will allow you to lock the door. It consists of a castle and crossbars. The latter are attached to the first using special rods. What are crossbars? They are rods made of metal.
The crossbars are able to move perpendicular to the border of the door frame and the web, moving to the lower and upper parts. The door closing process is carried out horizontally and vertically.
A bit about the castle system
In order to make the crab castle 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 activate the lock.
How to manage deviators? This is done both from cylinder locks and level 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 much effort to open the door. A “crab” lock works in such a way that it connects a metal door with a wall. That is why you should not be afraid that an attacker will be able to gain access to an apartment or other room.
Most often, this type of lock is installed on armored and metal door leafs. Even when using special equipment, it will be difficult even for EMERCOM personnel to open the product.
Lock advantages
Existing crossbars are considered stiffeners. This not only increases the strength of the door, but also provides maximum protection against intruders. Due to the availability of multilateral locking, it will be difficult to open the front door even with special tools. The vertical locking rods, as well as the horizontal ones, ensure safety.
Castles shortcomings
Due to the fact that we are talking about multilateral locking, the door puts a strain on some parts of the lock product. Because of this, it wears out pretty much. 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 build quality and strength of the materials of all parts. If the “crab” lock has failed 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 all manufacturers are involved in the installation of the described lock, so you should clearly understand all the subtleties of the settings. It requires precision and scrupulousness. Best of all, to prevent mistakes, consult a specialist. Even with minimal problems, the lock can be difficult to operate and quickly break.
Technology features
Everyone understands that the reliability and quality of the lock determines the duration of use of the product. It should be understood that if additional deviators and traction are used, the resistance to break-ins will remain at the same level. Why it happens? Not a single intruder will cut the deviators; his actions will be aimed at breaking the castle itself. When the latter is opened, all other constipations are automatically deactivated. Therefore, you need to pay attention to the reliability and security of the castle, then security is provided to any person.
If the lock is installed poorly, then even during the operation of the most expensive models, they will prove themselves only from the worst side. What happens with this? Gaps may appear between the frame and the door leaf. This will entail an easy penetration of the attacker - he will be able to bend the door with deadbolts. Unfortunately, putting the rods into the box will be quite difficult, the reliability will be low. It is very difficult to repair a system that is installed correctly and on a 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 to install a new door structure.
Additional nuances
Quite often, a “crab” is used as a lock for a garage. Many buyers in the reviews write that the product is installed without problems and serves a fairly long period of time. The lock is easy to use, does not often break and seize, and at the same time provides excellent protection for the garage from breaking.
In residential buildings, such systems are rarely used, but a “crab” could well be the best option. For example, in the entrance without security, he will provide maximum security for the residents of the apartment.
The product is quite 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 there is a large flow of people. We are talking about warehouses where products are stored. Usually, in such cases, the protection should be at the highest level, so many shops and shopping centers use this kind of castle.
Summary
It must be understood that security is only 100% impossible with only one lock. Of course, comprehensive solutions should be used. They will make the door structure as reliable and efficient as possible. The “crab” castle, of course, is not easy to install, but if everything is done correctly and honestly, it will be able to perform all its functions at the highest level, without letting the owner down. Based on the foregoing, we can conclude that such a castle is a reliable protector of the premises. Have a nice use!