In modern construction and repair, safety and comfort play a key role, and one of the most important details that ensure these parameters is the safety and comfort of the building. door-finder. Many property owners take this mechanism for granted without thinking about its complexity and the importance of setting it up properly. However, it is the quality of the device depends on the lack of drafts, the noise level in the room and even the fire safety of the building as a whole. Door-curtainers. It is not just a spring, but a complex hydraulic or electromagnetic mechanism that requires attention.
The main task of the device is to automatically close the doorway after a person lets it go. This prevents the door from being slammed by the wind, reduces heat loss and blocks the spread of smoke in the event of a fire. In this article, we will discuss in detail how this mechanism works, what types of designs exist and why competent regulation is more important than the most expensive brand.
Working principle and internal arrangement
To understand how to service a mechanism, you need to understand its physics. Inside the hull finisher There is a cavity filled with special oil, and a pistons system. When you open the door, the piston compresses the oil, moving it through the valves, and the spring accumulates energy. When releasing the handle, the spring is unclustered, pushing the oil back, which ensures a smooth movement of the canvas. It is the viscosity of the oil and the diameter of the throughput channels that determine the closing speed.
Modern models are equipped with a system of valves that allow you to adjust the speed of movement in different parts of the trajectory. Usually there are two main zones: active opening and fine-tuning (final pressing). Hydraulic compensator in the design prevents sharp jerks, making the work silent. If the mechanism starts to work in jerks or too quickly, this is a signal that the screws need to be adjusted.
⚠️ Attention: It is strictly forbidden to completely twist the speed adjustment screws. This will lead to depressurization of the body, leakage of oil and irreversible breakdown of the mechanism.
It is important to note that the quality of seals and piston directly affects durability. Cheap models often suffer from changes in oil viscosity with temperature changes, making the door too tight in winter and too fast in summer. Professional mechanism use all-season liquids that retain their properties in the range from -40 to +50 degrees Celsius.
When choosing a closer, pay attention to the availability of a fire safety certificate if the device is planned for installation on evacuation routes.
The main types of door closers
The construction fittings market offers many solutions, and the choice depends on the type of door and installation site. The devices are divided by the place of installation, the type of force transfer and the principle of operation. Understanding these differences will help avoid mistakes when purchasing equipment for an office, warehouse or private home. Let’s look at the most common categories.
The first and most popular type is slip-finder. They are mounted on top of the door box and the canvas. Inside this group, mechanisms with a geared lever and with a sliding rod are distinguished. The first are more reliable and durable, the second - more compact and aesthetic. For heavy metal doors, models with gear gear are more often used, as they withstand high loads.
- 🚪 Invoices: Classic option for input groups, easily mounted and adjustable.
- 🔘 Hidden: Built into the end of the door or into the floor, remain invisible, but more difficult to maintain.
- ⚙️ Floor: Ideal for glass doors and shopping malls, can withstand a huge flow of people.
- 🔥 Firefighters: Equipped with an electromagnetic lock, open automatically at an alarm.
Special attention deserves floor-finder. Their axis of rotation coincides with the center of gravity of the door, which allows you to open the canvases weighing up to 300 kg. Such systems are often found in airports and shopping centers. Despite their high cost, their reliability and minimal maintenance requirements make them the standard for high-traffic spaces.
Effort Classification (EN) and Standards
The choice of the mechanism power is a critical stage. If you install a weak closer on a heavy metal door, it will quickly fail. If it is too powerful on a light wooden door, it will be impossible to use the door for children or the elderly. In Europe and Russia adopted the classification EN European Norm, which divides devices into 7 classes depending on the weight and width of the door leaf.
Classes are denoted by numbers from 1 to 7. For example, the EN3 is suitable for light interior doors weighing up to 37.5 kg, while the EN6 and EN7 are designed for massive fire protection structures weighing more than 100 kg. There are also adjustable models with a range, for example, EN 2-4, which allows you to adjust the force to specific operating conditions.
| Class EN | Max. door weight (kg) | The width of the canvas (mm) | Type of premises |
|---|---|---|---|
| EN 2 | 25 | 600 | Inter-room, lightweight office |
| EN 3 | up to 37.5 | 750 | Offices, apartments |
| EN 4 | 50 | 900 | Store entrance groups |
| EN 5 | 75 | 1100 | Heavy front doors |
| EN 6 | 100 | 1250 | Industrial facilities |
The load calculation also takes into account the wind load if the door is outdoors. In such cases, it is recommended to take a device with a power reserve, that is, a class above the calculated. Ignoring the weight characteristics leads to deformation of the body and breakage of the rod during the first year of operation.
⚠️ Warning: Installing an EN2-class closer on a 60 kg door is a safety violation and will cause the equipment to fail quickly.
Installation rules and typical errors
The quality of the installation directly affects the life of the device. Installation begins with markup. This is done using a template that usually comes complete with the product. The pattern is applied to the door, and through the drilling points are holes. It is important to observe the perpendicularity of the axes, otherwise the lever will be skewed, which will cause creaking and uneven wear.
The fasteners must match the material of the door. For metal fabrics, screws are used for metal, for wooden ones - special screws. If the door is hollow (for example, MDF with cellular filling), you need to use pass studs or strengthen the place of attachment with mortgages. Installation on the "emptiness" is guaranteed to lead to the tearing of the mechanism.
☑️ Checklist before installation
One of the common mistakes is the wrong angle of installation of the lever mechanism. The lever should move in the same plane as the direction of opening. If the angle is broken, there is a lateral load on the axle, which causes a characteristic knock when closing. Also, it is often forgotten to check the door's progress before the final tightening of the bolts - nothing should interfere with a full opening of 180 degrees (if provided).
The Secret of Durability
When mounting on a street door, use frost-resistant lubricant for movable lever connections, even if the manufacturer declares all-season. This will reduce friction at extremely low temperatures.
Adjustment of speed and closing force
Once installed, the mechanism almost always requires adjustment. Adjustment finisher It is carried out by means of screws located on the end of the body. Usually there are two or three. The first screw is responsible for the main closing speed (for example, from 180 to 15 degrees), the second for the fine-tuning speed (from 15 degrees to full closing), the third (if any) for the slamming force.
The adjustment process requires patience. Turning the screw clockwise, you reduce the cross section of the channel, slowing the movement of oil and, accordingly, the speed of the door. Against the sentry, speed up. Changes should be made literally by a quarter of a turn, and then check the result. Abrupt adjustment can lead to a hydraulic shock inside the system.
It is important to distinguish between speed and pressure. The force depends on the degree of compression of the spring, which in simple models cannot be regulated, and in advanced ones - you can use a separate screw or valve. If the door is not completed and there is a gap of 2-3 cm, perhaps there is not enough strength at the finish, and you need to add a turn of the screw of fine-tuning.
Perfect setup: The door closes smoothly, with no pauses in the middle of the path, and presses tightly at the end, but without a strong impact on the joint.
Service and extension
A door closer is a mechanism that works in an aggressive environment, especially if it is installed at the entrance from the street. Dust, moisture, temperature changes - all this affects the oil and oil. Regular maintenance allows you to extend the life of the device to 10-15 years or more. Neglect of simple rules of hygiene of the mechanism leads to its jamming.
First of all, it is necessary to monitor the cleanliness of the rod and the body. The accumulated dirt works like an abrasive, destroying the glands. Once every six months, it is recommended to wipe the rod with soft rags. If you notice oil stains on the body, this is a signal of depressurization. In most cases, such a closer is easier to replace than repair, since it is impossible to restore tightness in artisanal conditions.
- ❄️ Winter mode: In extreme frosts, the oil thickens and the door can close very slowly. Don’t try to force it to close, it will damage the lever.
- 🧹 Cleanup: Use only neutral detergents. Aggressive chemistry can eat paint and seals.
- 🔧 Checking the fasteners: Once a year, check the tightening of the bolts of the mounting of the body and lever - they can weaken from vibration.
If the mechanism began to emit extraneous sounds (screaming, whistling), this may indicate the entry of air into the hydraulic system or wear of bearings. In the first case, sometimes it helps neat "pumping" (several opening-closing cycles in different modes), but most often it is a sign of the end of the resource. Timely replacement It is cheaper than repairing a door box after the door stops closing and the room chills out.
Can I install a door on a plastic door?
Yes, you can, but with caution. It is necessary to use special fasteners that will not damage the profile, or to fasten the mechanism to metal reinforcement inside the profile. Lightweight plastic doors are fitted with small class closers (EN2-EN3).
Why did the doorkeeper stop holding the door open?
Most likely, the locking device of the open position (if any) was worn or the spring weakened. Also, the cause may be a skewed door box, because of which the mechanism cannot fix the canvas at the right point.
How to remove the door without damage?
First, unscrew the lever from the canvas, then from the body. The holes can be masked with decorative plugs or splashed if you plan to install a new device of a different size.
Does the frost affect the work of the finisher?
Yes, substantially. Cheap oils thicken and the door closes very slowly or doesn't close at all. For street doors, use models labeled "frost-resistant" or special low-temperature oils.