The contents
Now no one is surprised by the massive use of security locks at entrances of apartment houses and gates in the local area. The need to limit access to outsiders with a large number of tenants in any other way not to decide. But effective combination lock on the front door?
What are the locks on the door should not be installed ↑
The desire to expel the residents of the entrances of apartment buildings outside actors pursued in order not only to get rid of vandals and juvenile delinquents. Combination locks on an entrance door was to be addition to your own locks on the doors of apartments and to help to prevent burglary. Of available devices on the front door has become a popular mechanical combination lock «METTEM», still occurring in the Khrushchev and families. It is worth noting its benefits:
- Maximum simplicity of construction of the mechanism;
- High maintainability and ease of code change;
- Installation requires no special skills or knowledge;
- Low price;
- There is no need to connect to the power supply.
Besides the obvious advantages, there are also clear disadvantages. The mechanism of the device requires regular maintenance, cleaning and lubrication. In factory grease combination lock is at least a year. If after a year of not having to replace the motor to adjust the mechanism, the lock bolt will start to stick and will not completely exit the body, resulting in occasional cases, when the latch fails and door stays open.
Rigel mechanical code lock is extremely sensitive to shock doors. If the casing is installed with a slight skew, regular shock loads can easily disable the work item.
The weakest side mechanical lock is the low resistance to code-breaking by the selection of combinations of key presses. Numeric combination consists of three digits. As shown, due to the specific design the number of possible combinations of keypresses on nabornik less than 300 variants. A simple brute force combinations on average takes no more than 5-7 minutes.
For the front door entrance of the house is not enough. At night or in bad weather, when the attacker has at least 20-30min and the ability «magic» on the undetected, the probability of opening the front door dramatically increases.
Device code mechanical lock on the door ↑
Secret numbers for mechanical combination lock installed simply. For this you need to remove the back wall to find the locking plate located in front of the numeric digits of the code. Next, you’ll need the plate removed from the socket, rotated a half turn and inserted back into the cell.
Working lock mechanism by a simple scheme:
- At the time of the closing door latch or bolt lock, under the action of base plates for floor heating door recessed into the housing, compresses the working spring.
- When closed the front door bolt is released from the housing and placed on a retainer system related secrets. Each secret is a flat plate with two asymmetrical grooves, corresponds to a certain button on the front panel;
- Simultaneous pressing of all numbers of the code frees the clip holding up to this point the bolt in a locked condition. Refexively working element acquires the mobility, and the front door is open.
To specific discomfort mechanical code of the device is the need to press the buttons on nabornik at the same time, which is very inconvenient. The vast majority of tenants committed to perform a simultaneous pressing of buttons with one hand since the second hand is almost always a bag or package. So of the 300 available combinations is usually applied one that is most convenient for typing, not twisting the wrist in a bizarre way.
Almost always on the buttons that are pressed most often, the formation of wear or contamination. Attackers know this, as well as secrets about the rest of the mechanical lock, and keep using them.
For use on the front door to the entrance of his opportunities enough. But if the entrance to the apartment leads through a joint with the neighbors on the landing, the vestibule, the installation of such a code lock on the front wooden doors of the vestibule will be a good option.
The platform attempts to open the combination lock selection code or to break down the front door of the thieves Tommy, immediately attract the attention of neighbors, because of the good acoustics in the stairwell.
There are also more complicated mechanical system with rotary dials instead of digital buttons on the panel. Similar in design to combination locks used in safes. Possible such mechanisms are practically equivalent electronic combination locks, but usually not designed for high load and constant opening and closing of the occupants. This product with high resistance to cracking, designed for infrequent use, with complete independence from the power supply, which in some cases is a big advantage.
Electronic combination locks ↑
The possibilities of modern electronic databases allow you to create combination locks on the front door arbitrarily high reliability and complexity. The market offers a wide variety of designs of security locks. Conventionally, an electronic combination lock on the front door entrance can be divided into some of the most popular options:
- Combination lock, combined with the intercom system;
- Kletochnye electronic locks with a robust housing and sensor alarm opening;
- Combination locks with duplicate key element in a magnetic plastic card, key FOB or on the basis of wireless communication systems.
In this case, the landlord, from outside the housing, can block access to anyone, even when correctly typed code.
Currently, electronic locks almost completely replaced mechanical code locks on the entrance door in apartment buildings and private houses. With the exception of budgetary organizations, cooperative and old Soviet Khrushchev, tenants who do not want to pay for a modern system of locks.
The most common, reliable and relatively inexpensive system is using a classic panel with pin keypad rubber membrane or magnetic elements. The buttons and the panel itself, as a rule, are made of anodized aluminum with engraved numbers. The gap between the panel and metal sheet front door closed bronenakladki, which provides a fairly high resistance code device to burglary or vandalism.
Panel lock sure provides light indication of operation in the form of two color LEDs, usually red and green. The complexity of management and the proper installation electromagnetic actuator requires special skills. Therefore, the installation of electronic security locks, their programming, repair and warranty service, typically handled by specialized firms. The cost of the kit this code lock is of average quality, usually do not exceed one hundred dollars. Much more expensive installation and connection of battery backup power. Panel keyboard can withstand about one hundred thousand clicks, which is approximately one and a half years, after which the need to replace the rubber membrane.
The largest resource of have a system of electronic devices using the optical form reader code is entered. Exterior panel made of metal has fake buttons that when entering code numbers, people finger crosses the laser beam – so reads the entered code. The system is very reliable and expensive, so in most use in the offices of large companies.
Features of the use of code locks on the entrance doorway ↑
Often in the hallways of apartment buildings, are equipped with combination locks on the front door, there is a situation when due to temporary power failure or malfunction of the castle residents independently switch off the system and open the front door almost wide open.
This is understandable, magnetic drive can lock the door with the broken security lock, and people need to be able to move around freely. When negligent maintenance of a firm in a similar situation with the front door can last for several days. Therefore, in addition to high-quality lock on your front door, it is important to choose a contractor to provide warranty support of such an important device.
