Overhead lock for metal doors: models, installation, reviews

If once all the doors were wooden, thenToday, most of the entrance doors to apartments and entrances, not to mention the wickets of country houses, are made of metal. And their design does not always allow the use of mortise locking devices, in such cases the invoice lock is installed.

Advantages of overhead locks

The overhead lock for a metal door has several advantages that can shift the scales in its direction when choosing:

1. A simple installation that does not require special skills and a complex tool, that is, it is not always necessary to call a locksmith, and the owner can easily install the lock himself.
2. For installation, it is not necessary to open the frame, and in many cases also the door leaf, maximally preserving its protective functions.
3. Repair of locks, which do not need to be removed from the cavity of the metal box, is easier to perform, as, indeed, and their replacement.
4. Full door thickness locking device is protected from rough mechanical breaking. At least, quietly remove the lock or break its integrity will not succeed.

In addition, the flat sheet construction of the door (in the entrance, for example) can dictate its conditions for installing the lock.

Disadvantages of overhead locks

But, unfortunately, ease of installation turns aroundand the ease of unlocking the lock from inside the apartment without a key, if, say, the robbers managed to penetrate it through the window. And besides, the overhead lock for a metal door can not be upgraded and changed to another design.

With the help of a mount or a hammer, such a locking device is easy to open, if not to be afraid of noise.

Whatever their design, the inside view of the door with the overhead locks is much less aesthetic (and dust has to be wiped) than a smooth cloth.

Mounting of the overhead lock

The door-way door lock, regardless ofmodel and design features, is installed on the inside of the door so that it completely protrudes above the door leaf (overlapping). For fixing the body, a special bar is used, welded or bolted to the door by bolts.

In the bar or in the door leaf, if it is not, the holes for the fastening elements of the locking mechanism and the mating part are marked, as well as for the key. Then these holes are carefully drilled.

The overhead lock of the simplest design is screwed with screws to the door leaf from the inside, and the lath of its inlet opening is installed from the outside. That's the whole installation of the overhead lock.

True, these are the main stages. And additional actions depend on the design features of the locking device, for example the installation of handles or a cylinder.

Classification of overhead locks

Overhead locks are classified according to several criteria. And most, perhaps, the most important of them is the degree of security of the castle.

By design features locks can bebolts or bezrigelnye, designed for left-hand or right-hand doors. Now you can choose a suitable overhead lock for the metal door, do not turn it upside down and then open in the opposite direction.

Locks can be double-sided, openingkey from the outside and from the inside, or one-sided, which are opened with a key only from the outside. Can have additional functions, such as a lock of a waybill with a latch, fixed or spring.

Out-of-order locks are made from different materials, which affects not only the cost, but also the reliability and durability of the device.

Materials for manufacturing locks

When choosing the locks, you must turnattention to the material from which they are made. So, plastic ones are generally not suitable for heavy metal doors. Soft silumin or brass, brittle pig iron, although it is stronger than non-ferrous alloys, is also not a good choice.

On the door to the entrance, which should serve as protection and in severe frosts, the shockproof cast-iron lock in the winter becomes brittle and can collapse from a slight mechanical impact.

High-strength steel can withstand both temperature drops and shocks, and locks of them are distinguished by their high anti-burglar qualities.

Classification of overhead locks by type of locking mechanism

According to the type of locking mechanism, there are three types of locks, including overhead ones:

1. Cylinder. In addition to simplicity and reliability, a great advantage is easy repair of locks, by replacing the larva (cylinder mechanism). Its degree of protection depends on its complexity.
2. Suvaldnye locks. They are considered the most reliable. Suvaldami called figured plates, located inside the castle. The more of them, the more reliable the castle. But the bearded keys with which the plates are displaced are large enough, as, indeed, the locks themselves. Judging by the reviews, not all people like these bulky mechanisms on the inside of the door. Another drawback of lock locks - they are also opened from the inside only with a key.
3. Smartlocks. These keys do not need keys for these modern mechanisms. They open with the help of code like many doors to the porch. But abrasion of buttons from frequent pressing leads to that the code ceases to be a secret, and it should be changed frequently.

Smartlocks, by the way, can be opened with the help of a picture of the eye retina or fingerprint. Suit, most likely, such locks for safes - and only personal, but they are very expensive.

Classification by the mode of action

By the way of operation, the overhead locks can be divided into mechanical ones, which are the most common today and are opened with the help of keys, and electrical devices.

Electromechanical devices are the samecode smartlocks. There is such a door-way lock from the shutter mechanism and the instrument panel, on which the programmed code is dialed. Its significant drawback is the dependence on the availability of electricity. It is necessary to disconnect it, and the lock stops working, and the door remains open.

The same drawback is inherent in electromagneticlocks, which are universally installed on the door to the entrance to multi-storey residential buildings. The locking mechanism is tuned to the electromagnetic fields of the keys and opens as soon as the magnetic key is brought to the reader on the outer panel.

Hacking these locks without preparation is almost impossible, to find the code you need expensive equipment.

Expensive electromechanical or magnetic locks can be operated from a battery installed on the inside of the door. And then their main drawback is eliminated.

Security classes of locks

There are four classes of security locks. They are determined not only by mechanical strength, which does not allow you to break the lock out. By the way, many negative reviews about overhead locks are based on the experience of a distant and not very childhood, when it was possible, with a little podtnamazhivshis, knock out overhead locks on wooden doors opening inwards. Modern metal doors open outward, and it is almost impossible to dislodge such a structure from a metal frame.

Another parameter that affects the security class is the degree of secrecy of the lock, that is, the ability to pick up the master key:

• First class security locks are opened in minutes. This is an English (or cruciform) castle.
• The second class includes locking mechanisms,which can be opened in about 10 minutes, noiselessly, and with the help of an electric tool, which undoubtedly attracts attention. If a safety class is not indicated in the accompanying document, then the mark that the lock is suitable for interior and entrance doors, already speaks about it.
• The most popular locking device, judgingby numerous reviews, is an overhead lock for a third-class metal door. The opening time of such a lock is from 15 to 30 minutes, and without noise it does not do. In many models, additional protective pads are installed. Suvaldnye locks belong to this class of security.
• Locking mechanisms of the fourth class canresist cracking from half an hour to three hours, depending on the degree of complexity of the lock and additional locks. They are used, for example, in safes and doors of premises, which are subject to increased protection requirements.

Security lock secrecy

The secrecy of the castle includes security(protection against mechanical impact and cracking with the help of a master key), the number of combinations of the key and the lock, the wear resistance of the device and the probability of matching the keys.

There are three levels of secrecy. The simplest locks of low-strength materials with the number of possible combinations of up to 10 thousand belong to a low level of secrecy.

The average privacy is from 5 thousand to 5million combinations. In such devices, the locking mechanism is made of high quality materials, and on the materials of the body and handles, the manufacturers save.

Locks for safes have the highest level of secrecy. They are protected from both mechanical impact and burglary, the materials are resistant even to acid, the key profile is very complex, possible key and lock combinations up to a billion, the precision of manufacturing parts is high.

Safe overhead locks

Locks for safes and valuables can becall the top of the overhead locks for metal doors. They can be locked with a key and by mechanical or electronic combination, with magnetic or biometric identification.

Mechanical locks are often suvaldnye, the keys toit has two grooves. Cylindrical or pomp locks with diagonal incisions on the crossbar, which coincide with the notches of the key, are less common. When the key is pressed, its notches are taken out of the gears from the mating with the mating part. Complex geometry allows you to open the lock only with an absolute match of incisions.

Electronic locks make it possible to complicate keys andincrease the number of transactions or link work with the safe to a specific performer with certain biometric indicators, a fingerprint, for example.

Popular models of overhead locks

Overhead locks are much cheaper, but cost savings lead to a primitive and quick cracking and to a negative attitude towards overhead locking devices in general.

According to reviews, the most popular by the ratioprices and quality are the locks of the Polish company GERDA. This company pays attention to the aesthetic function of its overhead locks. They are produced not only in different colors, but also in several styles.

Castle bill cylinder models Gerda ZN 100and ZN 200 is designed for entrance and interior doors, but has a sufficient degree of secrecy, reliable in operation and is equipped with anti-slip ergonomic rotary knobs.

Quality lock locks releasethe Russian-Italian company CISA-Elbor. For example, "Elbor Sapphire" 1.09.56.MA with the fourth class of security, 12 suvalds and number of combinations exceeding 10 million.

The lock waybill code "Dori-4 classic" - the mostknown product of the Sevastopol company DORI. It has no analogues in the world. Despite the fact that it is a code lock, the lock can withstand impacts of up to 500 kg and has two dozen useful functions.

Overhead locks for metal doorsa bunch of. They are produced by well-known manufacturers, who are seriously concerned about their own reputation, and therefore, about the high quality of the products. When choosing a lock, you need to carefully study the accompanying documentation and check the quality of the mechanism. For example, clicks and mashes indicate that the parts are not well adapted and can lead to operational problems.