Types of gas lifts for office chairs, how the device works

Icer
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Icer November 10, 2018Specialization: master in the construction of plasterboard structures, finishing work and laying floor coverings. Installation of door and window units, finishing of facades, installation of electrical, plumbing and heating - I can give detailed advice on all types of work.

Gas lift is often an important design for any office or computer chair, on which the comfort of using the furniture largely depends. In the review I will tell you about the device of the gas cartridge and its main features. I will also describe the process of replacing a failed part with a new one, so that you can do the work yourself, using the article as instructions.

The gas lift is fixed in the crosspiece and connects the support part to the seat

Structure and design features of office chairs

All existing office chairs can be divided into the following groups.

• For managers. They are distinguished by their large dimensions and solid appearance, most often upholstered in natural or artificial leather. They have the greatest number of functional capabilities, for example, a synchronizing mechanism that ensures repetition of the movements of the seated back and seat, mechanisms that regulate the depth of the seat, back resistance, negative tilt, etc.

  
  Executive chairs are comfortable and sized.

• For the staff. They must be comfortable and reliable, so when choosing them, the main attention is paid to the shape of the seat and backrest and the gas lift mechanism, and not to appearance. They are lightweight, which allows for a high level of mobility, and have modest functionality, which includes mechanisms that regulate the height of the armrests and seat, as well as the angle of the backrest. This group includes computer chairs and operator structures with armrests.
  

  Note! Such chairs most often have fabric upholstery, which can be made in different colors.

• For visitors. Such chairs must first of all be comfortable, beautiful and stable, and therefore they are devoid of any functionality. They often have four stationary legs, without a cross on wheels or a rotation mechanism. A modern chair is a functional and comfortable piece of furniture.

Almost all models are equipped with armrests. Cheap designs are made almost entirely of plastic, while more expensive ones are made of stainless or anodized steel.

Despite the existing differences, all chairs consist of the following basic elements:

• a five-beam cross, which is the basis of the entire structure and is made of plastic or metal;
• rollers, plastic or metal, having an internal hinge and metal fastening;
• pneumatic cartridge, or gas lift, which is the leg of the chair and provides elasticity;
• a swing mechanism that helps fix the chair in one position and tilt;
• piastra, which looks like a metal platform equipped with a lever, and is necessary for adjusting the height of the seat;
• permanent contact connecting the seat and backrest and responsible for changes in the position of the latter.

Multifunctionality is the main criterion when choosing a chair.

Note! Expensive chair models are equipped with a mechanism with an offset axis, which ensures the smoothest swinging process.

Office chairs have the following features designed to make working at your desk more comfortable:

• height adjustment, allowing you to choose the optimal seat height for each person;
• changing the tilt of the backrest, ensuring constant contact of the back with it, even when the sitting position changes;
• rotation around an axis and mobility created by rollers.

An office chair is a rather complex device and any of its structural elements can fail.

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What is

The gas lift used in office chairs is a device that is similar to the lifting mechanism of a dump truck, but smaller. Its other name is gas spring. Externally, it is a metal pipe with two parts of different sizes. The gas lift mechanism is fixed in the upper part to the base of the seat, in the lower part it is attached to the cross. The lifting height depends on the size of the pneumatic cartridge, the length of which varies from 13 to 16 cm. Gas lift functions:

• Seat position adjustment. When you press the lever, the structure rises if you stand up a little to reduce resistance, or lowers under your body weight.
• Reducing sudden load on the spine area. When lowered into the chair, the mechanism works as a shock-absorbing device. The seat is springy, significantly reducing the load on the spine.
• Possibility of rotation 360 degrees. Due to the features of the system, you can easily reach objects that are at arm's length, located on both sides.

The hydraulic cylinder is configured for actions that are necessary when working simply at a desk or at a computer.

Installation

The main advantage of such fittings is its reliability, durability and aesthetics. These qualities explain why gas lifts for kitchens have become so popular lately. How to install it is well known to any furniture assembler. To do this you will need: a ruler, a screwdriver, a screwdriver and a drill. The gas lift lifting mechanism for the kitchen is attached using a spring bracket, which allows you to simply snap the mechanism or plates onto it, fastening to it using screws.

The upper end of the gas lift is fixed on the side wall of the inside of the cabinet at a distance of 29 mm from the bottom edge of the top shelf and 37 mm from the edge of the side wall. The length of the gas lift is determined by the dimensions of the furniture as follows: when the door is opened downwards, with the upper part reinforced as described above, the lower part is attached to the door at the following distance from its inner end:

• with an internal cabinet height of 190 mm - 50 mm;
• at a height of 264 mm - 84 mm;
• at a height of 365 mm - 128 mm.
• Thus, in the first case, the length of the entire bracket when open is 164, in the second - 244, in the third - 355 mm.

What it is

The gas lift, which is an integral part of office chairs, is a device that in its appearance resembles a truck body lifting system, but is slightly smaller in size. Another name for this device is a gas spring.

Externally, the gas lift for the chair is a metal pipe with a couple of parts of different sizes.

The mechanism of this gas spring is attached from above to the base of the seat, and from below it is attached to the crosspiece. The lifting height will depend on the size of the pneumatic chuck. Usually its length varies in the range of 13-16 centimeters.

It should be noted that the gas lift has 3 functions.

• Dampening the shock load on the spine. The point is that when a person sits down in a chair, the mechanism works like a shock absorber, springing the seat and significantly reducing the load on the spine. Thanks to these properties, the chairs become significantly more comfortable and easier to use. That is, you can quickly sit down and get up without fear of back problems.
• Adjusting the seat position. Using a pneumatic chuck, you can raise or lower the chair in a few seconds without making any serious effort. Simply press the lever from below, and the structure will either fall under the weight of its mass, or rise if you stand up from it, which will reduce resistance.
• Possibility of circular rotation of the chair. This allows you to freely access everything that is located at a distance of up to 50 centimeters and turn where you want, if necessary. The special mechanism is designed in such a way that you can spin around its axis without any problems.

In fact, a gas lift is a special hydraulic cylinder designed specifically for office chairs.

What is gas lift

First, you need to understand for what purposes this node is used and what functions it performs.

The structure is installed in the crosspiece and fixed at the base of the seat; it is necessary for three main purposes:

• Adjusting the seat position . Using a pneumatic chuck (another name for the unit in question), you raise or lower the chair in a matter of seconds without making any effort. Simply reach out and press the lever, after which you can either lower the structure under its own weight, or raise it by standing up slightly to reduce resistance.

The seat height can be adjusted to any person very quickly thanks to the gas lift

• Damping the shock load on the spine . When you sit down, the system acts as a shock absorber, springing the seat and significantly reducing the load on the spine. Due to the springy properties of the chairs, they become more comfortable; you can quickly sit down and stand up without fear that this will cause back problems.
• The system allows the chair to rotate 360 ​​degrees . Thanks to this, you can freely reach everything that is around at arm's length and turn to a colleague or any person if necessary. The special mechanism is made so that you can spin around its own axis in any direction without any restrictions.

The gas lift allows the chair to rotate freely in any direction without any manipulation on your part.

In fact, this is a special hydraulic cylinder that is designed specifically for office chairs and is adapted specifically to the functions that are needed in this type of furniture. I will discuss the device and other important points below.

The most common breakdowns of office chairs

Damage to the cross

The main damage to this element is a breakdown at the junction of the beams. It is important to consider the material it is made of. The base is a hollow structure, inside of which you can place a polypropylene pipe of suitable cross-section and dimensions. The pipe is rigidly fixed to the damaged beam and base.

Note! You cannot splice plastic elements using a soldering iron or glue due to the high load on the paws.

The best option is to replace the plastic structure with a base made of glass-filled polyamide.

Disassembling an office chair is not difficult.

Dismantling the cross is carried out as follows:

• Removing rollers. Usually they are not rigidly secured.
• Dismantling the piastres. The fastening to the seat is carried out “on a cone”. It is necessary to disconnect the piastrum from the pneumatic cartridge by tapping at the attachment point.
• Removing the retaining clip. It is located in the recess of the upper segment of the gas lift.
• Knocking out the gas lift. If the damage is serious enough, this will not work. In this case, the working cylinder is removed along with the bearing and seal.

The convenience and ease of setting up office furniture directly affects the work efficiency of those who use this furniture.

Destruction of the swing mechanism

If it breaks, the chair stops holding the “horizon”. Dismantling this element is quite simple:

• Unscrew the four mounting screws.
• Knock the air cartridge out of the mount.

During movement, a proportional unloading of the entire spine occurs along its length.

The preferred solution to the problem is to completely replace the part. You can use a welding machine to repair an old mechanism.

Note! Russian and Chinese standard mechanisms differ in size.

Gas lift failure

If the integrity of the pneumatic cartridge elements is damaged, the rod does not extend when pressed. In this case, a complete replacement of the entire mechanism is necessary. It cannot be disassembled due to gas pressure.

Also, quite often the cause of breakdown is the bending of the adjustment lever, which just needs to be bent and returned to its original state.

Gas lift breakdowns occur for several reasons.

The design of a computer chair is quite complex, and at the same time extremely thoughtful. This ensures maximum comfort during use and allows you to work for a long time in a sitting position.

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Recommendations for long-term use of an office chair

In order for a computer or office chair to last as long as possible without any breakdowns, it is necessary to care for it and follow certain rules.

• About once every six months you need to inspect all the furniture parts, check the tightness of the connections and whether all the nuts and bolts are tightly tightened;
• Fabric parts must be cleaned with a vacuum cleaner. If there are stains, you can use various stain removers;
• If the upholstery is made of leather, it must be wiped with a damp cloth soaked in a special solution;
• It is worth considering the maximum load of the chair used;
• There is no need to sit down suddenly on the seat to avoid breaking the crosspiece or gas lift;

If you follow the necessary recommendations, your office chair can last for many years.

Chairs on wheels are a modern invention that helps you work in comfort, move around the room and reduce stress on your back. But if used incorrectly, and especially when trying to swing on such a chair, damage may occur. The crosspiece of the chair is most often subject to deformation. In this article we will look at why this part is needed and how to properly replace it yourself.

Selection rules

There are a huge number of modifications of office chairs, so the gas lift for them is selected individually. It is recommended to consider three factors:

• The class determines the thickness of the cylinder wall and the ability to support a certain mass of a person for a specified period of operation. On average, chairs are designed for a load of 80 to 200 kg.
• Gas spring sizes vary. An important parameter is the diameter of the glass body, which in most cases is 50 mm. The length depends on the height adjustment range of the office chair.
• The manufacturer plays an important role. The service life largely depends on the quality of the manufactured product.

Specifications

If the bed is equipped with a gas lift, the surface of the product can be easily raised and returned to its original position. Everything will go smoothly and without unnecessary noise. The main characteristics of such lifts are:

1. The main substance that ensures the functionality of the structure is inert gas (most often the cylinders are filled with nitrogen).
2. The chamber, rod and support tips are made of steel.
3. The minimum thickness of the walls of the cylinder, which is filled with gas, must be 1 mm, otherwise it will be unsafe to use the structure.
4. Any gas elevator can be compressed by applying force.
5. For the device to function properly, the room temperature must vary between -30/+70 degrees.

It must be taken into account that the pressure in the cylinder is very high. That is why, if an element is deformed or another malfunction is discovered, it is strictly not recommended to disassemble it and try to repair it yourself. Below is a table showing the calculation of forces for vertical beds.

If a person does not know how much a bed weighs, one can be guided by average values. A single design weighs about 30 kg. The weight of an orthopedic mattress varies from 30 to 40 kg. Therefore, a single bed weighs on average about 60 kg.

How to buy a quality product?

One of the selection parameters is the working length. It should allow the chair to be lowered or raised to the required amount. In some cases, the lifting height is purposefully limited. The simplest designs work on the principle of increasing resistance when raising/lowering, making movement smoother. Modern models have already introduced automatic systems. Work on the production of gas lifts is carried out on modern equipment using exclusively high-quality materials. Although some manufacturers seriously save on components.

Is it worth saving and purchasing a cheap gas lift? What troubles could this entail? Smooth movement and silent operation of the rod is ensured by high-quality processing of the cylinder surfaces. This operation is very expensive. If the technological process becomes cheaper when operating a gas lift, there is a possibility that it will jam, and its operation itself will be accompanied by noise. The use of low-quality valves with a short service life leads to their weakening. They will lose their initial effort pretty quickly. The use of poor steel for the manufacture of the stem and body causes excessive wear on these elements. As a result, the shock absorber will begin to jam, and squeaks will be heard during its operation. The cheaper the seal, the faster it will begin to leak gas, completely rendering the device inoperable. Another common problem when using low-quality gas lift is the breakdown of the air regulator. This can be solved by replacing the entire mechanism with a more expensive one, specifically designed for office chairs. Quite often, a gas lift is a supporting or load-bearing element in an office chair that can bear heavy loads. If the mechanism fails, the user of the chair may be seriously injured.

Where to buy a gas cartridge?

You need to purchase a gas lift only from trusted stores so that the device meets all standard requirements and is safe to use. Using a low-quality device can lead to serious consequences, since the gas cartridge inside is filled with high-pressure gas.

The online store www.kresla27.ru offers a wide range of mechanisms, so you can purchase any gas lift in Khabarovsk at an affordable price. We offer only high-quality accessories for office chairs that meet all standards and are suitable for any chair.

Features of the design and its functioning

First, you will learn what the node in question is, and then I will talk about the principle of its operation. Everything is quite simple, and you can easily understand the topic by reading this short section.

Gas lift device

To help you understand what the mechanism is, consider the diagram below. It shows all the main components that are found in all products of this type.

This is what a pneumatic chuck looks like in cross section

If it seems to you that everything is very complicated and you cannot cope with the repair work, then do not rush to close the article and take the chair to a specialist. The fact is that when carrying out repairs, you do not have to disassemble the product; firstly, this is not necessary, and secondly, it is unsafe - the gas inside the system is under pressure and any violation of the integrity is fraught with danger to life and health.

The main design elements are:

• Button. By pressing it, a valve opens and closes, which releases gas from one chamber to another, thereby raising or lowering the chair. This element is pressed using a special lever, which is most often located under the seat.
• Gas valve . Keeps the system in the desired position and opens when it is necessary to change the seat height.
• Various bushings and seals . Necessary for tightly connecting all elements and sealing cavities in which gas is located.
• Internal, external cavity and bypass channel . Due to the movement of gas through these structural elements, the height is adjusted.
• Lifting rod . It extends or, conversely, lowers into the body, depending on whether the height of the chair increases or decreases.

The rod is durable, since it bears the entire weight of the sitting person

• Support bearing . It is located at the bottom and is responsible for the free rotation of the chair in both directions. This connection is simple and lasts a long time.

Gas lifts - what are they and what are their features?

Gas lift is a shock-absorbing mechanism whose purpose is to open doors and hold them in that position. Thanks to him, this does not require much effort. The design is completely sealed - nitrogen is placed inside during the production of the product, and if it is damaged, it cannot be repaired. The advantages of gas lift include:

• reliable fixation and smooth movement;
• easy opening even in the absence of a handle;
• long service life;
• compatibility with any door material.

They give kitchen cabinets a stylish look, allow them to be used quietly, while maintaining the integrity of the elements and extending the life of the furniture.

How are they installed?

Installation of the gas lift is carried out in strict accordance with the instructions, which is the key to its uninterrupted operation

It is important to understand:

• each facade will require 2 gas lifts, which avoids its distortion;
• the 100N marking indicates the need to mount the cabinet to the wall and is used only for heavy and massive doors;
• installation of products is carried out at the very end, when other fittings are already installed.

The installation process is very simple - you need to fix the fasteners for the gas lift, then put the product on them and press until it clicks.

Installing door closers and hinges with your own hands is not particularly difficult and only requires compliance with simple rules. Their design is simple and, coupled with patience and accuracy, will quickly achieve the desired result.

Principle of operation

The operating principle of a gas lift for office chairs is simple. A rod with a piston moves along a cylinder located in a body made of metal. There are two containers in the pipe, and between them there is a valve. It can be in a closed or open position, when gas moves from one cavity to another along the passage channel. When the seat is positioned at the bottom, the piston is located at the top. When the lever is pressed, gas moves from one container to another. In this case, the piston moves down and the structure rises.

To fix the seat at the required height, the lever is lowered, the valve closes, and the lifting of the chair stops. To lower, the lever is pressed, and the structure begins to lower under the weight of a person. The gas piston allows the chair to be adjusted in height and rotated around its own axis. A special spring significantly reduces the load on the spine during a sharp landing, thereby preventing many diseases.

Features of repair work

You can repair a chair yourself if you know all the nuances of the work process and have all the necessary equipment at hand.

Causes of breakdowns

First of all, I will tell you about the causes of problems so that you can prevent breakdowns whenever possible:

• Manufacturing defects . It doesn’t happen very often, but nevertheless such situations arise from time to time, especially in the budget segment. If the warranty period has not expired, they will fix the breakdown, but if more time has passed, you will have to carry out the repairs yourself.
• Overloading of the structure . If the chair is designed for one weight, and a person with a larger weight sits on it, then the wear of the elements occurs much more, plus the likelihood of breaking the gas cartridge increases significantly. Another common situation is when two people often sit on a chair.

The documentation always contains information about the weight the structure is designed for. Most often this is 100 kg, there are reinforced systems for 120 and 150 kg, they are more expensive, but also more reliable.

• Incorrect operation . If someone sits down on the chair or suddenly lowers itself onto the seat, the gas lift is overloaded and the valve can simply be squeezed out, which leads to breakdown.

Types and sizes

There are different types of gas lifts, which is why in order to select the right option you should know the different models of mechanisms and what is special about them. Usually they are all made from the highest quality steel. Typically, gas lifts are divided into classes depending on thickness. There are 4 of them in total.

• A feature of the models that belong to the first is that the thickness of the steel here is only 1.2 millimeters. These are the cheapest devices;
• In the second group, the steel thickness will be slightly larger - 1.5 millimeters;
• The third group will already have a steel thickness of 2 millimeters. Such gas lifts can withstand loads of up to 120 kilograms.
• The last group consists of the most durable devices, where the steel thickness is 2.5 millimeters. Such a reinforced gas lift can withstand 30 kilograms more than models from the third group.

In addition, the devices in question may differ in case diameter. They can be of 2 types.

• 38 millimeters. This option is not used very often. It is usually used in executive chairs where the crosspiece is too high
• 50 millimeters. Used in 90% of chairs.

Another important parameter will be the length of the mechanism in question. The range of height settings will depend on it.

There are the following groups of gas lifts according to this criterion.

• From 20.5 to 28 centimeters. This version will be used in relatively affordable office products designed for sitting at desks with standard characteristics. Such a gas lift will be short due to the fact that its adjustment range is extremely small.
• From 245 to 310 millimeters. Such gas lifts are used in places where the structure must rise higher. Although the length of the device is longer, the adjustment range here will be even smaller than that of the above-mentioned analogue.
• From 290 to 415 millimeters. These are the longest mechanisms that have wide possibilities in terms of height adjustment, which makes it possible to greatly change the position.

These groups of gas lifts are considered the main ones, although other models can be found on the market. For example, 180 mm. But they are used quite infrequently, which is why they are more of an exception to the rule.

Kinds

There are several modifications of gas lift; they differ in size, length and material. The most popular are chrome or brushed steel pneumatic chucks.

The Barski company provides the opportunity to buy chairs with different mechanisms: chrome-plated metallic - the color of sophistication and gloss, matte - style and harmony.

Differences:

1. By class , there are only 4 of them, where 1 and 2 are the cheapest options, 3 and 4 imply an increased load of up to 150 kg, called the reinforced option.
2. By lenght . The most practical gas lifts are 205-280 mm high, but there are also 245-310 or 290-415 mm on the market.
3. Diameter – 50 or 38 mm. The last option is used, as a rule, for tall models of office chairs or the so-called category - for an executive, boss.

Tips for choosing

Gas lifts for office chairs, like all devices, can fail over time, but you can repair them yourself. Breakdowns are usually caused by:

• Manufacturing defects. The phenomenon is rare, but sometimes occurs, especially in budget products. If the warranty period has expired, the repairs are carried out independently.
• Gas lift overload. There are situations when a structure designed for one weight is used by a heavier person or two people sit on it. Then the parts of the mechanism wear out much faster and more severely.
• Incorrect operation. Damage occurs if you sit down suddenly or take a running start. The device is overloaded, which can lead to the valve being squeezed out.

The documents included in the package contain information about the maximum permissible user weight. Basically, this is 100 kg, but more expensive and reliable devices are produced, which are designed for 120 and 150 kg.

If the gas lift for an office chair breaks down, it is not enough to repair it; it is important to choose the right new design. The correct choice is very important, since discrepancies in parameters will again lead to rapid wear. The following points should be taken into account:

• Product dimensions. The structures are manufactured with different dimensions, so the gas lift is selected in accordance with them.
• Cup holder diameter. It comes in two types, so choosing the right option is easy.
• Gas lift height. It is necessary to measure the length of the product, taking into account the fact that part of it is located inside the cross.
• Maximum load. The product class should be selected depending on the weight expected during operation. Moreover, the fact that other people can use the chair is also taken into account. If a piece of furniture is at home, then most likely all family members will sit on it.

Gas lift plays a very important role in office and computer furniture. The chair is designed in such a way that the spine does not get tired when sitting for a long time. The mechanism makes it easier to work in the office and makes staying at your home computer more comfortable.

Product dimensions

Maximum load

Installation technology

Review of outdoor cabinets for gas cylinders, selection rules

How to install a gas lift system on a cabinet? Before installation you must:

• determine the method of fastening the fittings;
• prepare tools to do the job;
• familiarize yourself with the diagram for attaching the lift to the cabinet door.

Mounting methods

The gas lift can be installed on a furniture cabinet:

1. using fixing pads secured with self-tapping screws. This option is easy to install, but can only be used for products made of wood, chipboard, MDF and analogues;
2. using screws with a locking function. The primary area of ​​use is metal and plastic surfaces.

Types of fasteners

As a rule, self-installation of a furniture lift is carried out on plates, since the installation of screws must be carried out at the furniture manufacturing stage.

Tools and materials

To perform installation work you will need to prepare the following kit:

• tape measure, square, marker (pencil) for applying preliminary markings;
• drill for preparing holes for fastenings;
• screwdriver and screwdriver for fixing the lift.

A gas lift is exclusively an additional device that facilitates the process of using a cabinet or other piece of furniture. The main fittings of a cabinet door are furniture hinges.

Even after installing the gas lift, the main load is taken by the hinges

Gas lift installation

Direct installation is carried out after installing all the cabinet door fittings according to the following scheme:

1. determination of mounting locations for furniture lifts. The location of fasteners is determined in accordance with the planned opening angle of the cabinet door. As a rule, installation dimensions for all situations are indicated in the attached instructions;

Determining lift mounting locations

1. in the marked places holes are drilled, the diameter matching the size of the fastening bolts;
2. fasteners are fixed;
3. The gas lift is fixed on the fasteners. Fixation is considered complete only after a click. In some situations, fixation requires some effort.

Gas lift mounting

You can watch the video for more information about the process of installing the lift yourself.

It is recommended to carry out work on installing a gas elevator before the final installation (hanging) of the cabinet. This will allow you to apply markings more accurately and avoid distortions. It should be remembered that in order to ensure the correct operation of the fittings, it is recommended to install two lifts on cabinets, beds and sofas.

How to choose

Considering that there are different categories of gas lifts, and this is a part that fails from time to time, it would not be superfluous to consider the question of how to choose the right gas lift. To begin with, it should be said that the cause of breakdowns of gas lifts, due to which they have to be replaced, are the following points.

• Manufacturing defects. This problem is rather an exception, but still occurs, especially in the most accessible versions.
• Gas lift overload. It happens that a design that is intended for one mass is used by people whose weight exceeds this indicator, which is why the wear of the components occurs at an accelerated pace.
• Incorrect use. It happens that a furniture or any other gas lift may fail due to the fact that a person suddenly sits down in a chair or even does it with a running start. Using the chair this way can result in the valve simply being squeezed out.

In such cases, replacement of the gas lift is required. But to implement it, you need to choose it correctly. This is extremely important, because discrepancies in certain characteristics can lead to accelerated wear of the new device and its subsequent breakdown. To prevent this from happening, you should make a choice based on such moments.

• Cup holder diameter. It can be of 2 types, so using this criterion it will be easy to determine the desired option.
• Gas lift height. In this case, it is necessary to measure the length, taking into account that the part will be located inside the cross.
• Product dimensions. Note that gas lifts are made with different dimensions, so the size must be taken into account when choosing.
• Maximum load. It is necessary to select the class of the mechanism depending on the mass that it will have to withstand during use. Moreover, it should be taken into account that the chair can also be used by other people.

Criterias of choice

When choosing a furniture gas lift, you should take into account the two most important parameters: the compression force and the dimensions of the door where the device will be attached. To hold 1 kg of load, you will need a force of 10 Newton. Once you know the mass of the door, you can determine the required size. Most manufacturers create devices with a load of 50–150 Newton. In addition to weight, the size of the door is very important. The maximum length of the furniture gas lift depends on this. The larger the spring required, the wider the housing required.

The use of step-by-step or automatic door designs depends on the gas lift. The first is distinguished by the presence of handles on the facade. The second implies that the sash will open when the button is activated, and then after a certain period of time will automatically close. To achieve this effect, an electric drive is built into the furniture. The devices are ideal for people who forget to close cabinet doors behind them.

How to change

As was said, if a gas lift breaks down, it is almost impossible to repair it, which means it needs to be replaced. To do this, you first need to prepare certain tools and understand the algorithm of actions. You will need to have the following things on hand:

• a new gas lift, which will be installed instead of the old one;
• crosshead screwdriver;
• hammer;
• ring punch;
• WD-40 liquid;
• vice.

So, before replacing the gas lift with a new one, you need to remove the old one.

To do this, we treat the joints of the chair parts with WD-40 liquid . We leave the structure in this state for about 12 hours so that the mixture gets onto the joints. Now you need to start disassembling the chair and disconnect the seat. To do this you need a Phillips screwdriver. With its help, we loosen the bolts that secure the seat to the piastre. After this, we turn the chair over and remove the seat along with the decorative cover, which is located on the lift.

Now you need to disconnect the lift from the cross and piastres. This can be done by knocking out the gas lift with a hammer with a rubber tip. To speed up this process, you can use a drift. Before starting work, remove the special locking ring from the crosspiece. This is a pin, which is located on the back side of the cross where the pneumatic cartridge is attached.

Now you should remove the pneumatic cartridge from the piastrum. This work should be done as carefully as possible so as not to deform the connections. Tapping with a hammer should be done in different places so that the gas lift can be carefully removed.

You just need to install a new gas cartridge.

First, we insert it into the cross until it clicks, applying some force, and put on the protective casing, after which we connect everything to the piastr. All that remains is to reassemble the chair in the reverse order.

The video below talks about how to choose the right gas lift for a chair.

Procedure

Precise adherence to the procedure is the basis for proper installation. By following these steps step by step, you will be able to avoid common mistakes that can lead to damage to the product and shorten its service life.

Preparation and assembly of MDF parts

A large number of bed parts are made of MDF. When starting installation, all elements are freed from the packaging film and inspected for damage. If at least one element has defects, replacement is required. A damaged bed frame will not be secure. The parts are laid out at the installation site so that the side with holes for fasteners is on top.

Installation of box and base

The main parts of the bed are the box and the base. First, the perimeter of the structure is assembled, which consists of three walls and a head back. To do this you need:

• connect the walls and the head back to each other using fixing elements;
• a base is placed on the constructed frame, which is usually made using wood and a metal frame;
• To securely fix all components, tighten the screws with a screwdriver.

In some types of beds, longitudinal strength elements may be provided. In particular, solid longitudinal ties, brackets and corners, fixed to the structure with screws, are common

Installing Corner Ties

The purpose of corner ties is to impart reliability to the assembled structure. The screed consists of several elements:

• a corner in the form of a metal plate bent in the central part at a right angle;
• bolts for fixing the plate to the frame;
• threaded bushings.

To connect the two walls of the bed with a corner tie, the plate is placed on the inside at their junction. Then the bushings are inserted and the bolts are tightened first on one wall, and then the connections are aligned and the fasteners are fixed on the adjacent wall. If desired, it is possible to replace the standard model of corner tie with a modern version, for example, confirmat or minifix, which are distinguished by more compact dimensions.

How to install the lifting mechanism

1. Secure the furniture frame to the lifting mechanism. It is recommended to use screws for this. Before final fixation of the fasteners, it is necessary to level the gaps between the base and the frame.
2. Determine the appropriate level of force to operate the mechanism. As a rule, this information is indicated in the attached documentation.
3. Install the structure into the lifting mechanism with the cylinder facing up, using nuts with a locking ring and fluoroplastic washers.
4. Tighten the fixing nuts to the limit, then loosen the fastening slightly, leaving minimal play. After this, you should check the functioning of the lifting mechanism by lowering and raising the structure several times.

Installation of the traverse

The traverse is a special element that performs the function of a screed. Using a traverse, the lower part of the bed frame is fixed. The element is placed along the structure parallel to the longitudinal tension parts. The use of a traverse helps strengthen the structure, ensures stability and durability, and also makes it possible to securely fasten small side elements that most often fail.

Design and principle of operation

If we talk about the structure of the part in question, then it should be said that the main parts of this design are such elements.

• Button. By pressing it, the valve closes and opens, which releases gas from one chamber to another, which allows you to adjust the height of the entire structure. Pressing occurs using a lever located under the seat of the chair. Although sometimes it may be located in a different place.

• Lift rod. This part extends or lowers into the body, depending on the increase or decrease in the height of the chair. By the way, this part is especially durable, because the mass of a sitting person puts the greatest pressure on him.

• Various types of seals and bushings. They are needed for high-quality connection of various parts and sealing cavities where gas is usually located.

• Gas valve. This part holds the entire mechanism in a certain position and opens if the seat height level needs to be changed.

• External and internal cavities, as well as a bypass channel. Thanks to the movement of gas through these parts of the mechanism, height regulation occurs.

• Support type bearing. It is located below and is responsible for the free rotation of the chair in different directions. The strength of this type of connection is its simplicity, which ensures its durability.

If we talk about the principle of gas lift operation, then it cannot be called complicated. To begin with, the mechanism consists of a pair of reservoirs and a valve that can open and close. It is his work that causes the gas to move through the bypass channel between the containers. If the chair is in the lower position, the piston will be in the maximum raised position. When you press the lever, the valve opens, the gas begins to move into another tank and thereby presses the piston, which moves down and raises the chair.

Once the chair is at the desired level, you simply release the lever to lock it. The valve will close immediately and the chair will be in the desired position. If you need to lower the chair, you just need to press the lever, after which it will lower under the weight of the person. That is, to raise the chair, you need to stand up from it. As you can see, the operating principle of a gas lift is extremely simple.

Gas lift for a chair: dimensions, rules for selection and replacement 05/30/2021 18:49

Today, almost every office has a special, so-called office chair, on which employees sit at their desks. It is much more comfortable than a regular chair, because it allows for height adjustment, allowing you to choose the best level for the person sitting. In addition, in this chair you can recline the back if necessary. One of the most common breakdowns of such chairs is the loss of the ability to adjust the seat height. And the reason for this is the malfunction of such a part as the gas lift. Let's try to figure out what kind of detail this is and what it comes in.

Varieties

Gas lifts for chairs are divided into types depending on the size of the structure and the strength of the steel. Before choosing a suitable modification for a computer or office chair, you should study all the nuances. The first thing you need to pay attention to is the device class, which indicates the thickness of the steel and the permissible load:

• The first is budget fittings, the metal thickness is only 1.2 mm, such a gas lift is suitable for children's models.
• The second one also belongs to the inexpensive segment, the steel thickness is 1.5 mm and will not withstand heavy loads.
• The third is a type of gas lift with a metal thickness of 2 mm, maximum load 120 kg.
• The fourth is a reinforced case with a metal thickness of 2.5 mm, permissible weight 150 kg.

Characteristics of fashionable glider chairs, advantages of their use

In addition to classes, gas lifts differ in body diameter. Existing sizes:

• 50 mm - used in almost all models.
• 38 mm is a rare diameter; such gas lifts are mainly installed on executive chairs with a high cross.

Another important parameter is the length of the gas lift. This indicator determines the maximum seat height:

• 20.5–28 cm. The device is designed for chairs that are used in offices with standard desks or computer desks. This gas elevator has a relatively small range of height settings.
• 24.5–31 cm. Used when you need to raise the chair more than the standard height.
• 29–41.5 cm. The longest gas lift with wide height adjustment options.

When a gas lift breaks, the user is faced with the question of how to choose a new mechanism and what to pay attention to. Even a minimal discrepancy in characteristics can lead to rapid wear of a new part, so when purchasing you need to consider the following points:

• Gas lift size - mechanisms can have different dimensions. You need to make sure that the part will fit correctly into the base of the chair.
• Cup holder size - there are only two diameter sizes, so choosing the right one will not be difficult.
• Height - it is necessary to measure the length of the old part, taking into account that part of the gas lift is inside the cross.

The procedure for making a rocking chair from different materials with your own hands

You also need to pay attention to the load. The class of the mechanism is selected depending on the body weight of the owner of the chair. If the furniture is used at home, most likely, the entire household will sit on the chair. For office furniture, it is better to choose a gas lift with a maximum load.

Varieties and differences

Gas lifts are used not only in the manufacture of office chairs, but also in the production of furniture. Gas springs are installed on the doors of kitchen, bedroom and other units so that the facades close smoothly. Many models of folding sofas and wardrobe beds include this mechanism. The design and technical characteristics depend on the application.

Based on the direction of action, there are two types of mechanisms:

1. Direct-acting gas lifts in the operating phase of movement compress the rod, which is normally extended. Such models are used in the manufacture of furniture to ensure smooth closing of doors, lowering of surfaces, and more.
2. Reverse gas lifts work in exactly the opposite way. In the initial position, the rod is recessed, and when performing the main function it moves out.

Based on pressure, gas springs are divided into high and low pressure. Models of the second type have a long service life.