Homemade locks that thieves don’t even try to pick. Options for door closers that you can make yourself Homemade door lock mechanism

To protect the house from unauthorized entry, locks are installed on the doors. They are different types and types, so choosing the model you are interested in, taking into account your requirements, will not be difficult.

Classification of door locks

According to the degree of protection and the opening mechanism, locks can be divided into the following groups:

• constipations - hook, latch, etc.;
• locks - mechanical, electromechanical, electromagnetic.

A simple option for the unlocking method is constipation. They do not contain a secret locking mechanism and no keys are used to unlock them.

Of the locks that have a mechanism, the simplest option is mechanical devices. To open or close them, you need a key, which is inserted into the well and, depending on the design, either turned or moved back and forth. As a result, the lock is activated and the door opens.

An electrical signal is used to control electromechanical and electromagnetic devices. They allow the use of a remote control to open the system remotely. It is possible to use fingerprint or palm print reading, voice control, etc.

According to the mounting option, locks are:

• invoices,
• mortise/built-in,
• mounted

Invoices are less practical, so their use is gradually fading away. The castle consists of two important elements: on one side there is a secret mechanism and a latch, on the other side there is a strike plate.

Mortise-type door devices are more practical and popular. When fastened, the main part is located in the body of the door. Only the keyhole is visible from the outside, decorative panel and a handle to open the door. The counter part is located in the same way in the door frame.

The built-in type lock is more practical. It is also located inside the door leaf, but the only difference is that it does not cut into it, but is installed during the manufacturing process of the door. Distinctive feature Such devices are considered to have crossbars, which can be located not only in the lock area, but also along the entire perimeter of the door.

The padlock is only used for locking outbuildings. Because its use on entrance or interior doors is impractical.

Almost any lock contains the same set of elements:

• lock cylinders;
• retractable crossbars;
• pens;
• halyard tongue;
• overhead panel.

A distinctive feature of locks for interior doors is the absence of a secret mechanism, while door devices entrance blocks cannot do without them. The more combinations of the lock, the more reliable the locking device.

Eat individual species door designs, which are classified as burglar-resistant. It is impossible to open such a lock without the original key.

Based on the type of locking mechanism, door devices are divided into lever and cylinder.

Locks can be purchased in specialized stores or at the construction market, or you can make them on the door yourself. It is much more difficult to find a key for such a lock; it is assembled from high-quality elements, and only the developer knows the layout of the secret part.

In addition, locks are divided by area of ​​application, and therefore they are:

• for entrance doors;
• for interior doors.

Their structure is approximately the same, but there are still differences, which makes it possible to differentiate devices by purpose.

Lock mechanism

The larva is the main part of the castle. The safety of personal property depends on its reliability and secrecy.

Depending on the design, the larvae are:

• cylinder;
• level;
• disk;
• crossbars;
• crusades.

Cylinder devices are characterized by the location of the secret mechanism in a kind of cylinder. It consists of several pins that are responsible for opening and closing the lock. In order to unlock such a device, you need a key with special notches, which, when turning the key, will move the pins into a certain position.

Level types are considered more reliable. This is explained by the presence of special levers, which are raised to a certain level when the key moves in the keyhole.

The disk device is less reliable, but no less popular. To unlock such a mechanism, you need a key, in the form of a rod cut in half, with characteristic notches. When such a key is turned inside the keyhole, a kind of tunnel is formed and the disks turn, resulting in the mechanism being unlocked.

Crossbar mechanisms are less reliable, so they are used very rarely. The unlocking principle consists in the movement of two crossbars, which are pulled away from each other by special keys.

The cross type larva is the most unreliable. You can break into this type of lock with a Phillips screwdriver at your disposal.

Homemade latch lock

The operating principle is as follows: a bolt (like a furniture bolt) is installed in the door, which is turned using a hex key. The bolt passes through the entire thickness of the blade. On back side On the sash there is a rail (latch), which is attached to the bolt. For this purpose, a flat flat is made at the end of the hardware. This is done using a needle file. The rake is placed on the flat. To prevent the steel plate from falling off the bolt, it is supported with a nut, which is screwed on one side and the other of the latch.

To lock the door, the latch must be in the striker.

Now, to open the door, insert a hex key into the head of the bolt and turn it. Simultaneously with the rotation of the bolt, the latch also turns.

The trick with this latch is that it is difficult to find the head of the unlocking bolt on the surface of the blade.

DIY mechanical lock

You can make such a valve yourself. She represents metal plate, which looks like in the figure.

A small hole (about 10 mm) is made in the sash. The key rod has a plate at the end that can rotate around its axis. When the key is inserted into the keyhole, the plate and the rod form a single straight line. A limiter is marked on the rod, and the key is inserted into the hole clearly along this limiter. Next is the plate under own weight is lowered and fixed in one of the slots on the valve.

To prevent the rail from falling out when moving, a limiter or stopper is installed for it, made in the form of a stop and two supporting brackets. Thus, on the one hand, the movement of the rack is controlled by a stop - a limiter, on the other - it moves to the first bracket.

Only your own key made for this lock can open such a system, since it is impossible to determine from the outside the length of the plate attached to the rod.

Electromechanical door device

When the door is locked, the bolt, consisting of a rod and a head, enters the striker, and the spring associated with it is stretched or charged. The spring is connected to a coil or solenoid. When the power is turned off, the spring is released and the bolt is retracted into the lock.

Attention! If there is no electricity, the lock can be opened from the outside using a key, and the door can be opened from the inside using a special lever or button.

Electromagnetic door locks

To understand how to do magnetic lock with our own hands, first let’s look at its structure.

Lock and its structure

The main element of the mechanism is an electromagnet, which is a core made of transformer steel in the shape of the letter W. This steel does not have a memory effect and is a soft magnetic material. The core is assembled from a large number of thin plates or made from a single plate.

Around the core is a winding of copper wire coated with enamel. The coil has a large number of(up to a thousand or more) turns. When passing electric current An electromagnetic field is created along the winding in the core, which controls the operation of the lock.

However, over time there is a weakening mechanical characteristics doors due to the effect of residual magnetization. To combat it, use the effect of changing the polarity of the voltage when demagnetizing the locking device. However, in this case, force must be applied to open the door.

Due to the absence of moving parts, the lock has a long service life.

Since low-alloy steel, which easily corrodes, is used to make the lock parts, they must be protected. For protection, varnishing, galvanizing or nickel plating is used.

The main parameter of the lock is the strength of the door. To increase the force used to hold the door, it is possible to install several locks. This value depends on the material from which the core and armature are made, the current strength and the number of turns in the coil winding. Performed as overhead type.

Electromagnetic or electromechanical locks are installed on fire doors, input structures in hallways, etc.

Types of electromagnetic locks

Depending on the operation of the anchor, structures are divided into holding and shearing. In holding models, the anchor acts on separation, and in shear models, it moves in the transverse direction.

For holding type locks, when voltage is applied, the resulting magnetic field in the armature-core circuit keeps the door from opening.

For shear-type devices, the armature has holes, and the core has protrusions for these holes. When voltage is applied, the armature is brought to the core and attracted to it. In this case, the protrusions of the magnetic circuit fit into the corresponding grooves of the armature. In this case, the holding force is characterized by the force that must be applied to shift the anchor, and design features protrusions and holes.

Shift locks are installed by inserting into the end of the door leaf and, thanks to this, this type allows you to install a secret magnetic bolt on front door.

Assembling an electromagnetic lock with your own hands

Let's consider one of the options for assembling the mechanism.

To assemble an electromagnetic lock, using your experience, which would be opened using a remote control, you need to:

• Push-button mortise panel.
• Power unit.
• Electromagnetic relays. If we are going to open it with a four-digit code, then we will use at least 5 relays.
• The castle itself.
• Button for opening the door from the inside.
• Reed switch and electromagnet.

Electromagnetic lock circuit

A keypad, for example, model KBD-10B, can be purchased on the market.

Thus, you can assemble any type of lock with your own hands. And it is important not only to build and beautifully decorate a house or garage, but also to protect it from unwanted visitors with a reliable lock.

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Many residents apartment buildings They advocate for the safety of their entrances, trying to protect them from the entry of hooligans, noisy companies and animals. A locking device - an intercom - will help them with this. It is a kind of device that is used for voice conversations and provides for two-way communication. The main task of such a device is to provide control and control of access to the entrance of visitors.

The intercom system is designed to ensure the peace of mind of residents and their safety. It is installed by agreement between the people whose apartments are located in a given entrance. And before an agreement is concluded with the organization that will install the equipment and undertake its maintenance, residents need to study the types of locking devices and determine which one they would like to purchase.

Modern manufacturers offer a wide range of intercom systems. What they are and what the principle of their operation is will be discussed in this article.

Advantages

A locking device for the entrance door of an apartment building or for a private home has a number of advantages. First of all, the advantages of an intercom system are that only the person who has the key can open the front door. Apart from the residents of an apartment building, only the service organization will have such an opportunity. Moreover, it will not be possible to make such a key in the nearest workshop.

Another advantage of the intercom system is that the entrance is protected from companies and homeless people trying to enter it just to keep warm. Animals will not get in here either. And if the owners do not want to receive guests, then they can simply turn off the bell of the locking device in their apartment. In this case, unexpected visitors will not disturb you even by knocking on the door. After all, they simply won’t be able to enter the entrance.

The advantages of an intercom include the fact that a safe distance is maintained between the visitor and the owner. In this case, the resident of the apartment or house can find out everything necessary about the visitor and accept final decision about his admission.

Based on practice, most cases of robberies, robbery, fraud and other illegal actions aimed at illegally taking possession of citizens’ property, as well as attacks on people’s health and lives, occur after the person who was attacked voluntarily opens the door.

Organizational aspects

The issue of installing a locking device for the entrance doors is decided by all homeowners at a meeting specially convened for this purpose. A decision made by 51% of voters will be considered legal. If the house is private, then the installation of an intercom system is carried out at the initiative of the owner.

At a meeting of residents of an apartment building, the issue of paying for the locking device, as well as raising funds for its installation and deductions for operation, should be resolved. Often at a meeting you can meet apartment owners who do not agree with the installation of an intercom. If the decision to install it was nevertheless made by general vote, then residents who make up the minority have the right not to contribute money. In this case, certain amounts for the locking device will not appear in the receipt issued by the service organization. Such residents must be given keys to the entrance without fail. Otherwise, such actions may be regarded as a violation of the rights of the homeowner.

Payment

Maintenance of the locking device is carried out by organizations that specialize in this activity. In this case, the mentioned service for residents is considered additional. The locking device has nothing to do with basic housing and communal services. That is why the decision to use it or not is a voluntary matter for residents of apartment buildings.

To the one who did not want to be given this service, you should not be afraid that a fee for servicing the locking device will appear in the receipt issued by housing and communal services organizations. Presentation of such amounts in this case would be illegal. The fee for the locking device will be charged only to those residents who have agreed to the provision of additional services and have entered into an individual agreement with the organization, servicing intercoms.

Locking device capabilities

An intercom system is a locking and intercom equipment, powered either from the mains or from autonomous sources. The second name of the device is “video or audio calling panel”.

Locking devices in the entrance allow users to identify a guest by image and voice, as well as remote control doors. The intercom controls entry and exit from the building, while having advanced functions.

Elements of such a device are installed in the residents’ apartment. And on the entrance doors of the entrance or in the immediate vicinity of them, a calling panel with buttons is installed. When you dial a digital code stored in the device’s memory, the switch transmits a signal using the principle of telephone or video communication. Some types of locking devices can be opened by the resident using a special chip.

The intercom has programming capabilities. This allows you to change its original password if necessary.

Intercom operation process

A subscriber entering the entrance can open the electric lock installed on the front door using a magnetic key fob (chip) or by dialing a code on a digital (push-button) external unit. What if a visitor wants to come into the house? Then he needs to dial the call button assigned to the subscriber or the apartment code. The owner, after receiving a signal from the locking device, identifies the guest by voice or image. He also lets the visitor in by pressing the unlock button for the electric lock of the front door, which is located in the apartment on the panel of the indoor unit.

The system works. The entrance door opens and the visitor enters the house. After this, the device displays whether the front door is closed or not after all these manipulations. Some types of locking devices do not have a remote opening function. They are usually installed in private homes. Homeowners in this case are forced to approach the front doors to open them.

Locking devices are classified according to the number of subscribers they serve and the method of identifying visitors. Let's take a closer look at these types of intercoms.

Number of subscribers served

According to this criterion, intercoms are:

1. Individual, or single-subscriber. Such a locking device is most often installed at security posts, at the entrance to cottages, houses, etc. Already by the very name of such an intercom it becomes clear that it serves only one subscriber.
2. Group. These are low-subscription locking devices designed to serve from two to six objects. As a rule, they protect closed apartment hallways or nearby offices. Group intercoms can also be used by several families living in cottages located close to each other. The designs of individual and group devices do not differ significantly from each other. Only the number of blocks of the same type can be different in them.
3. Driveways. These are multi-subscriber intercoms. Their installation allows servicing a large number of apartments, the number of which ranges from several tens to hundreds. Such locking devices are used in the entrances of high-rise buildings, in administrative buildings and so on.

The modern market also offers multi-subscriber integrated intercoms. They are installed simultaneously on several dozen entrance doors and serve up to several thousand subscribers. Such systems are installed in complexes of administrative and residential buildings.

Method of identifying visitors

By this principle locking devices are classified in the following way:

1. Audio intercoms. Such devices are capable of providing two-way audio communication between the subscriber and the visitor. The guest is identified by his voice.
2. Video intercoms. These locking devices are used to provide video monitoring of the space located near the front door. Moreover, such devices provide two-way audio communication. This allows you to identify the guest by his voice and appearance. One of the elements of systems of this type are video eyes. With their help, the owner of an apartment or house conducts covert surveillance of the visitor. Video eyes are miniature television cameras that are equipped with a special lens. From the outside, such a device is no different from an ordinary door peephole.

Type of connection and operating principle

According to this criterion, locking devices are:

1. Coordinate matrix. In such intercoms, a separate wire goes from the main unit to the subscriber unit. The main feature of such systems is the ease of installation. The connection diagram provides for connecting the switch to a coordinate device. The first of these two elements switches the call to a specific handset. In each apartment, coordinate matrix intercoms are connected using two cables. The numbers are never repeated. The signal after submission is processed by the modulator and redirected via the right cable. This is how the connection to a specific apartment occurs. If the installation is done incorrectly, it will disrupt the operation of not only one specific branch, but the entire system as a whole.
2. Digital. Such devices are connected using a two-core cable. Digital devices transmit video with detail, while having advanced functionality. The alarm call received by them is then transmitted using a two-wire line system. At the same time, the number is determined the desired apartment. A tube digital intercom has a microchip. This is a controller to which one or all floors can be connected.
3. Cable, wireless IP devices. Their operating principle is based on the use of the Internet, network computer technology(wireless and cable), as well as mobile and cellular communications(3G, GSM, IP telephony). In these intercoms, the necessary information is transmitted using SIP and IP protocols in the same way as in local computer networks.

Installation

The operation of intercom networks and equipment must be completely safe for persons who follow the rules for handling such devices. In this case, the equipment must certainly meet the requirements regulatory documents and fire and electrical safety standards that apply in Russia. The installation of the locking device is carried out with special care. After all, users of such systems are mainly persons who do not have necessary knowledge on handling electrical equipment.

What rules must be followed when installing locking devices? First of all, they concern external unit and electric lock. The voltage to power these devices must be within 24 V and not exceed this value.

As for the subscriber unit, inside an apartment or office it must be placed in a place that will protect the owner from possible criminal actions of the visitor (for example, carried out through closed door shot), and will also ensure the most comfortable use of the device.

The external block of the locking device is installed by inserting into the wall located near the entrance door, in door frame or into the door leaf. After securing load-bearing structure and the front panel of the intercom, the slots of screws or screws must be drilled out.

The installation of the external unit should be carried out at such a height that the use of the system is convenient for visitors conducting negotiations. The best distance from the floor is 1.5-1.7 m.

Intercom equipment to be installed at the entrance must be combined into mounting blocks placed in metal cabinets. The best place for them is considered to be the hall on the first floor.

All wires placed in the entrance are placed in metal hoses, in metal pipes or boxes. They can also be installed via previously laid cable channels.

Input of lines into the body of the intercom unit located outside closed halls and apartments must be carried out using metal couplings that ensure the tightness of the cables. If it is necessary to install flexible transitions from doors to walls, connecting devices are used.

The sequence of the intercom installation process includes the following steps:

1. Selecting a mounting location that should ensure ease of use, as well as the required viewing angle.
2. Electrical wiring. The performance of the entire system depends on the quality of this work. It is advisable that the wiring be attached directly to the walls using fixing elements.
3. Connecting the lock. To do this, you will need to lay another wiring line in parallel.
4. Installation of apartment device. To install it, the cable running from the front door is connected to internal panel, which is attached to the wall with a fixing plate.

Expanding the functionality of locking devices

Every day, manufacturers producing intercoms are improving their models. Today, devices with a large number of functions can be installed on the entrance doors of apartment buildings. Thus, some intercom systems have the ability to video record or record.

But that's not all. Some models of locking devices allow the installation of fire and burglar alarm, which are displayed on the console of the Ministry of Emergency Situations or the Ministry of Internal Affairs. Communication with ambulance and police services, emergency rescue services, etc. can also be established.

Some video intercoms have the ability to connect a monitoring and face reading system. Such devices greatly increase the safety of residents.

IN Lately increasingly choosing a locking device for the front door multi-storey building stands behind its residents. A lock is installed on the entrance door to prevent unauthorized persons from entering the house, whose presence is manifested in the form of garbage, cigarette butts, syringes, and also to complicate the work of burglars.

Modern manufacturers offer a wide selection of locks of various price categories and designs. In order to make a choice, you need to know what they are and on what principle they work.

When choosing a locking device, you need to pay attention to the following: the level of secrecy, the degree of burglary resistance, on which its reliability depends, the type and design of the mechanism.

Classification

The entrance lock is classified depending on the type of control panel:

• mechanical panels: with plastic, metal or rubber buttons. Service life is several thousand hundred clicks.
• optical panels. Such designs are more durable. Their functioning is based on the intersection of vertical and horizontal infrared rays, transmitting a signal to the control unit that occurs when touched.

The entrance lock to the entrance can be:

• invisible lock;
• electromechanical;
• electromagnetic;
• coded with mechanical locking.

Invisible locks have an electronic control mechanism via a microprocessor and are unlocked using a mobile device or key fob remote control. They have a high level of privacy, however, due to the high cost, including maintenance, they are practically not used for installation on the entrance door.

When choosing a lock for an entrance, due to the specifics of its application, you should pay attention to the following points. It must be resistant to temperature changes, moisture and dust. The presence of backlighting of numbers will greatly simplify its operation in the dark. Since there is a widespread trend of installing intercoms, the design of the lock should allow for integration with interactive devices.

Installation

Installing a lock in the entrance is carried out using tools such as a grinder, drill, metal drills, tape measure or ruler, wire cutters and screwdrivers. Installation of a rim lock comes down to attaching the case and the strike plate with self-tapping screws to metal sheet and the door frame.

Mortise lock installation steps:

1. By applying the lock to door leaf or by making it paper template, the body niche and places for fasteners are marked.
2. A niche is cut out and holes for the bolts are drilled.
3. The locking mechanism is inserted and securely fastened.
4. The code panel is installed and connected to the mechanism itself.
5. A hole for the crossbars is drilled on the jamb of the entrance door and a strip is installed.
6. The functioning of the lock is checked.

The accompanying documents for combination locks always contain detailed instructions, following which it is enough to simply mount the device yourself. If you do not have plumbing skills, it is better to contact a specialist.

Recoding

Since the numbers on the panel can be erased over time, let's look at how to change the code on the lock at the entrance. For this purpose, the device is dismantled by removing the panel.

The design of the lock is represented by special plates that have small cuts that are directed inside the mechanism when used for coding. Plates with cuts directed outward are attached to the buttons that are not involved in decoding the lock for opening. To change the code, you need to turn the plates over. As a rule, the code combination involves three digits.

Electromagnetic locking devices

The carrier of the code in such locks is a magnet, which is presented in the form of a card, key fob or the more familiar tablet. The magnetic lock has high level secrecy, however, for normal functioning Requires an uninterruptible power supply. Often such a device is available in the form.

Operating principle

The main element of a magnetic lock is an electromagnetic coil with a steel core mounted on a non-opening door. When electricity is supplied, a magnetic field is generated, attracting a metal plate that is attached to the second leaf. The strike plate is also made of steel, which is coated with nickel or chromium compounds that have anti-corrosion properties.

Kinds

By design, a magnetic lock can be:

• Holding, which closes the door solely due to the magnetic attraction of the leaves. This is the most common type of electromagnetic locks installed in the overhead manner.
• Shift: due to the influence of a magnet, it is not the flaps that are held in place, but the tongue that is fixed. Such devices are mounted by cutting into the door leaf.

Both types are marked using the index “ML”, to which a number is added through a hyphen. The numbers indicate the force, measured in kilograms, that must be applied to open the lock.

Installing a magnetic lock

To install a magnetic lock you will need a drill, metal drills, measuring tool, screwdrivers.

Stages of installation of an overhead magnetic lock:

1. The holes on the sashes for fasteners are marked by applying a lock and a strike plate.
2. Fastening the main and “reciprocal” parts of the lock.
3. The device reader is installed.
4. Connection to power supply.
5. Checking the work.

Visual detailed instructions for installing a magnetic lock on the entrance are shown in the video.

Device comparison

The table below shows Comparative characteristics in various ways entrance protection - combination lock, magnetic lock without installing an intercom and with it.

It is worth noting that the combination lock received the final highest score, but its actual security is the lowest. At the same time, equipping the entrance with an intercom, on the contrary, provides maximum protection. Therefore, the choice should be made based on a combination of indicators.

Also, when choosing, it is necessary to take into account the financial capabilities of the residents of the entrance, which can often become a decisive factor. In any case, you should not neglect the protection of the door, because even the most modest combination lock will become an obstacle in the way of ill-wishers who do not have professional hacking skills, and will help protect the elevator and staircase from littering and vandalism.

We are so accustomed in civilization that we buy everything ready-made in a store or on the market. However, as for the locks, they are all produced similar to each other. Several models with various types keys do not provide us with reliability and security when closing gates or doors.

In addition, the entire Internet is teeming with options for how store-bought locks can be opened or broken in a few seconds. Therefore, sometimes a criminal is stopped only by an article for burglary.

A completely different matter is homemade constipation and locks that cannot be opened without knowing the design. Therefore, the attacker does not even realize how the locking mechanism secures the door or gate and, as a result, they refuse to break in, so that there are rooms with lighter, typical locks. That's why homemade designs and are real, reliable locking mechanisms that thieves don’t even try to open.

The simplest lock is made in the form of a lock that slides on two guides. To move it, and therefore lock and unlock it, holes are drilled along the length and in the middle of the lock. The lock itself can be made not from iron, but it is better from textolite, oak, maple or other wood, since in winter such a bolt will not become covered with frost and then jam, like an iron one.

The hole for the key in the form of a bent thick rod should be made under the lock, so that when moving the lock with the key inserted, the lock rises slightly, increasing the length of the lock stroke. Accordingly, the constipation should move easily, having gaps. There should be a protective bar on top of the lock to prevent the use of supporting devices.

The key can be solid with properly selected bends and enter from the outside through an elliptical hole or fold out after it comes out of the hole inside the room. The secret of such a lock lies in the length of the key lever; naturally, the key should be stored so that the size is not copied by someone.

Hello, master! How can you design a cunning internal lock for a garage at your dacha? If it's easy, can you give me some advice?

Roman, Moscow.

Hello, Roman from Moscow!

You know, the main thing is not to outsmart yourself. Among our shabby circles there is a story about how a certain man hung a sledgehammer in his garage, which, if you don’t know about it, when opened, should hit the burglar in the forehead. Naturally, the man one day, drunk, forgot about this, with all that it entailed.

There is no trick against scrap except another scrap. Everything can be opened, another thing is that sometimes this takes a lot of time, and a thief does not always have this time.

I already talked about some tricks on my website. Therefore, perhaps I will repeat myself a little.

I consider several methods to deter burglars to be the most effective.

First. When beyond the usual garage doors two more gate leaves made of reinforcement (ordinary grille) are installed. And a simple padlock. But he hangs the wrong way outside, but from the inside. And it is covered from the outside with a welded plate. That is, it is impossible to see it, even if the outer gate is opened. And you have to open it by putting your hands behind the plates, by touch.

We did this and always laughed when the burglars, having opened the first gates, did not know what to do next. Moreover, all the garage things were already visible through the bars.

But this is not always feasible for a number of reasons.

Second option. A regular rack and pinion lock (with a plate key and not a round key). And a sheet of rubber about a centimeter thick (approximately 10/10 centimeters in size) is attached to one gate leaf from the inside. With a couple of bolts. The point is that sometimes, without opening the lock, bad people bend the metal of the gate and try to saw through the lock tongues hacksaw blade. The blade rests on the rubber and cannot cut. In my garage one day they knocked down the outside padlock, peeled back the trim and started trying to saw off the top tongue. But then they spat and finished.

Third option. When an external conventional padlock is covered with a welded box so that it is almost invisible. This ensures that the lock can be knocked down or cut down only after cutting the box. And this is somewhat difficult in the absence of access to sources of electric current, even if you have an angle grinder.

I’m not talking about video surveillance systems, but one client I know had a dummy video camera installed at an inaccessible height. He says it helps.

In addition, you can use a regular rail inside the garage, like a latch, which moves freely inside the supporting brackets and is closed in one position and open in another. To open, a key is used in the form of a pin, at the end of which a plate hangs on an axis. The owner first trains on open door and, if necessary, sharpens and adjusts the key for free opening. What is achieved by inserting the key to a certain depth into a hole made in the metal of the door (gate), up to the mark made on the key.

Such a lock is characterized only by the presence of a hole on the outside, which means nothing to the burglar.

For one client, we installed a custom hardened pentagon head bolt from inside the garage. This bolt could only be unscrewed with your own wrench and nothing else. The whole difficulty lies in the manufacture of such a bolt. That is, it was possible to go through the door, but the gate was locked from the inside with such a bolt. Thieves could steal small change, but not the whole car.

Since all these descriptions may not be completely understood, but drawing a bunch of sketches takes a long time, I will limit myself to depicting for clarity only one version of a rack and pinion lock.

By way of explanation, I’ll add that the hole in one of the gate leaves is about 10 millimeters, the key shaft itself is about 8 millimeters. The hanging plate hangs freely on a small axis. When the key is inserted, both the plate and the key shaft form a single straight line. After the key is inserted to the mark on the rod, the plate lowers under its own weight and falls into one of the slots on the rail. If not the first time, then move the key, it will definitely hit.

To prevent the rail from falling out, it goes in one direction until it stops, and in the other direction until it reaches the welded bracket. In total, you have to weld two brackets and one corner stop. After opening the rack lock, the second half of the gate is opened with a pair of latches, which are located in the upper and lower parts gate leaves. But this is already elementary.

Closing is done in a similar way; when the key is pulled out, the plate itself acquires the desired position and the key can be removed freely.

Lubricate the rail with liquid machine oil, otherwise called a spindle.

In this entire structure the most important detail- plate, its length is main secret lock, and since this size is not visible from the outside, it is almost impossible to guess it.

Of course there are plenty of other options. But enough said. You can't tell everything.

Other questions on the topic of garages.