What is better: coil springs or block springs? | What is the difference

The “snake” spring got its name due to its peculiar sinuous shape, reminiscent of the body of a snake when moving.

In most cases, it is used as a filler for sofas and chairs. Upholstered furniture made using snake springs has good orthopedic qualities.

Let's tell you more about popular springs. This will allow you to independently determine whether it is good or bad for you if there is a “snake” installed in the sofa.

Characteristic

Springs for the sofa “Snake” are a filler for upholstered furniture that has a tortuous shape. The material of manufacture is high-carbon metal of varying thickness. The thickness and frequency of placement of springs depends on the type, size and purpose of the product. Despite the fact that serpentine springs can be installed on all types of furniture, experts recommend not purchasing furniture with a serpentine spring unit for daily use. Application area:

• beds;
• sofas;
• couches;
• mattresses;
• armchairs;
• backs of upholstered furniture.

The presence of constant pressure can lead not only to a decrease in the orthopedic effect, but also to breakage of the steel wire.

To extend the service life, sofa springs are coated with a special protective coating that prevents the appearance of corrosive areas.

Properties

Orthopedic upholstered furniture is popular due to the design features of the products and the performance properties of the materials used.

A spring block with flat “snakes” is manufactured using an assembly method. The characteristics of the components depend on:

• by the thickness of the wire bent in a plane;
• physical parameters of steel, resistance of the metal to corrosion damage under the influence of high humidity (carbon alloys are coated with a protective layer of zinc);
• bending height, the parameter is indicated in the technical specifications;
• coil pitch, many types of “snake” are available, designed for various tensile loads.

The elasticity of upholstered furniture and orthopedic mattresses depends on the choice of the type of spring elements. Standards for elasticity and rigidity have been developed. Stiff springs are made of thick wire with a long coil length and small pitch.

Furniture with spring elements in the form of a snake has certain advantages:

• soft bases are designed for heavy weight, are made with a large margin of safety, and can hold their shape under the weight of obese people;
• orthopedic mattresses, seats last a long time and have good wear resistance;
• the metal is not subject to fatigue deformation and is protected from corrosion;
• individual springs are convenient to assemble and disassemble, and replace if necessary;
• there is no oscillatory effect;
• when using springs, they do not make knocks, squeaks or other unpleasant sounds, they work quietly;
• the padding, secured with a “snake”, is well ventilated, providing the necessary air exchange, this has a positive effect on the well-being of the person relaxing on the sofa or bed;
• orthopedic underwear has a smooth surface;
• tearing of the upholstery is excluded, there will be no accidental injury to the ends of the springs, they are firmly attached to the base;
• The cabinet is lightweight and easy to transport.

Despite the low depreciation rates, “snakes” are replacing other types of spring blocks.

Fastening snake springs in a sofa

Installing springs is not particularly difficult, especially for experienced craftsmen.

REFERENCE! The spring is made of durable steel, which is bent under high temperatures.

Then it is coated with a special composition, thanks to which it does not corrode.

The springs are attached inside (or on) a metal or wooden frame. In this case, a certain distance between the fasteners in the transverse direction is maintained.

The fasteners themselves are curved and are used for greater reliability. Their number is determined by the size and shape of the furniture. The frame of the product is very stable and does not sway.

There must be a polyurethane foam layer between the snake and the frame. It prevents hard material from coming into contact with the upholstery.

IMPORTANT! Furniture with such a spring has good performance characteristics and can last at least 20 years.

Upholstery materials - which one to choose

A variety of materials are used to upholster a sofa. Choose a finish taking into account all the characteristics of the fabric:

• velor is an excellent pile fabric, very beautiful, soft and pleasant to the touch. Difficult to maintain and wears out quickly;
• jacquard is a dense, smooth fabric for upholstering furniture made from natural and synthetic fibers. Very strong, durable and extremely versatile in design;
• matting is a fabric made of linen, cotton and artificial fibers in triple pair weave. Extremely durable and pleasant to the touch;
• flock is a non-woven textile designed for high loads and abrasion resistant. An excellent option for a sofa for daily use;
• leather - rarely used for finishing a sofa book. Synthetic or eco-leather is more often used. It is inferior to natural material in beauty and wear resistance, but is also durable and keeps cool in the summer.

Which option is better depends on the operating conditions. If a cat or dog lives in the house, you should not buy a sofa upholstered in velor, velvet or silk.

Why is the filler called “snake”?

The twisting shape of a metal spiral, such as a snake takes while moving, gave the inventors of furniture improvements an idea of ​​what to call the spring filler in upholstered sofas and chairs.

The “snake” is formed at high temperature . This is the only way to bend strong, rigid steel to the required parameters. To prevent the spring from rusting, it is treated with an anti-corrosion compound. Place the finished workpiece in the frame, where it is securely fixed with a special fastener. To prevent the “snake” from touching the upholstery and damaging it, a polyurethane layer . Sofas with this inner padding are in consumer demand.

The reasons for this popularity are the following factors:

• Resistance to loads while maintaining shape under a heavy body.
• Long service life without defects or repairs.
• Quiet operation with no annoying squeaks.
• Ventilation properties, the sofa “breathes” and does not have adverse effects on the health of the occupant.
• There are no holes, bumps, or uneven spots on the bed.
• Easy installation and transportation.

Upholstered furniture with a “snake” installed inside is endowed with an orthopedic effect , so doctors recommend sleeping on such a lounger if patients have problems with the skeletal system.

The developers tried to get rid of the previous shortcomings of springs and made the spiral more stable. Previously, if obese riders tried to stand up, they had difficulty doing so, as they sank so deeply into the seat. Today, sofas are soft and elastic at the same time; they do not allow your figure to sink. The assembly of such structures is also simple, which the craftsmen do with pleasure.

How to choose?

In order for the purchase of furniture to be successful and meet the stated requirements of reliability and quality, you need to decide on the purpose of the sofa (for relaxation, sleep or guests) and choose the optimal hardness of the mattress. The choice cannot rely solely on design, upholstery, transformation mechanism or filling: all characteristics are important.

Often a combined filler can be used in a model. The combination of materials provides maximum comfort not only during sleep: this technique allows you to conveniently watch TV, read your favorite books or newspapers, and much more.

Experts recommend a thorough inspection of the model and taking into account the following nuances:

• an average level of hardness is desirable (an overly hard or too soft filler will cause pain in the spine);
• when choosing a model with springs, you should give preference to the option with a steel block;
• it is desirable that the thickness of the mattress be at least 8 cm;
• The advantage of the model will be the presence of a cover: firstly, this will allow you to see the filling when purchasing, secondly, it will allow the cover to be washed, and thirdly, if necessary, repairs can be made;
• If possible, it is worth purchasing a product made from natural fiber (the risk of allergies is eliminated and the level of comfort is increased);
• if a model is purchased for sleeping, the seat and back should be made of the same filling;
• When purchasing furniture for children, it is better that the armrests are made of soft material: this eliminates the possibility of injuring the child.

In addition to the filler, you need to take into account the dimensions of the room, the transformation mechanism, the color of the model and design. The sofa should fit well into the interior of the room, and be not just beautiful and comfortable

We will make a comparison based on 3 main points: convenience, wear resistance and cost.

First of all, let's look at comfort, because, one way or another, this plays a decisive role when choosing a furniture attribute, even despite the price, although it does not occupy the last place. A little theory about springy fillings. They are either dependent or not. What does it mean?

In simple terms, the first option has survived more than one generation, and if you are hoping to relax on furniture where this particular technology will be used, then you are unlikely to succeed.

The second branch is more interesting for its technical component. On the other hand, a filler like latex will really relax your spine and allow you to truly get a good night's sleep.

Types of armrests

Armrests are an optional part of a sofa or frame. The most compact models do not have them. There are 2 varieties: hard and soft.

• Rigid ones are part of the frame. They are made of chipboard and covered with the same fabric as the seat. The top can be softer if filler is placed here. It can be even more rigid if a wooden panel is placed here. The hard armrest is comfortable to lean on; here you can place a glass of tea, a book or a TV remote control. For such purposes, the armrests are specially made wide.
• Soft - a kind of pillow, but denser than for sleeping and upholstered in the same fabric as the sofa. The soft armrest is usually not secured.

There is also an option for a hard armrest as a shelf. The module is an open niche that is integral with the armrest. The top is often made entirely of chipboard or MDF and serves as a tabletop.

• For daily use, choose a model whose dimensions correspond to standard bed sizes.
• It is better to choose a sofa with an orthopedic base, as this is a more comfortable place to sleep.
• The filler is selected taking into account the health status of the person sleeping on the sofa. A teenager needs a hard filler - coconut guillemot, hard polyurethane foam; an older person needs a softer option: lycra, spunbond.

If there are animals in the house, hard fabric is suitable for upholstery: tapestry, jacquard, flock.

Good or bad?

Like any spring block, the “Snake” design has a number of advantages and disadvantages.

Advantages:

• ability to withstand high load levels;
• increasing the service life of furniture;
• long-term retention of shape;
• ease of installation;
• ease of transportation;
• no creaking;
• presence of anti-corrosion coating;
• maintaining natural ventilation;
• long period of operation;
• affordable price range.

Due to the rigidity of the frame and the absence of a rolling effect, this type of spring is often more convenient than other models.

Flaws:

• low depreciation rates;
• impossibility of use in folding furniture.

Types of spring blocks

Block structures installed in sofas can have different designs. Each type differs from the other mainly:

• the method of forming a single block;
• properties of the part;
• quality of materials;
• price;
• other parameters.

Sofas can be equipped with spring blocks of various designs

When choosing a specific option, you need to understand what you will get if you use it. We invite you to take a look at what you can choose from.

Type No. 1 – dependent springs

This type of spring is found, as a rule, in sofa models that are already outdated. However, it is worth saying that they have two undeniable advantages that cover the mentioned obsolescence:

• affordable price;
• convenience.

All structures presented in blocks of this type are connected to each other by a single strong wire made of strong and flexible metal. It turns out that the impact that you exert on only one of the springs that make up this block automatically extends to all the metal elements surrounding it.

Mattress structure with dependent spring block

The most famous type of dependent springs are Bonnell blocks. They are often found because they belong to the economy segment of the market, and at the same time they do not cause any complaints from the people who use them.

The main positive features of Bonnell-type dependent blocks can be considered:

• comfort of use;
• long service life.

If you touch a sofa equipped with a block of dependent springs at one point and purposefully act on only one of them, all the others will also be involved, since this steel sheet is inseparable

The formation of spring blocks of this type is carried out using spring twists having two cones. To create each spring, pure high-carbon steel is used, the characteristics of which include:

• high strength;
• reliability;
• complete environmental safety and cleanliness.

These springs are made of high-carbon pure steel, strong, capable of withstanding any load and returning to its original state

Springs of this type are laid on a special platform, which is formed from solid building panels, for example:

• chipboard;
• MDF;
• plywood, etc.

Such a strong base not only gives rigidity to the sofa, but also protects our spring unit from sagging and damage from below.

Corner sofas are also equipped with similar blocks, however, for their convenience it is necessary to cover the sides of the structure with polyurethane foam boxes

Prices for different types of corner sofas

Corner sofa

Provided that the dependent type of springs is used to equip corner-type sofas, then the block made up of them must be sheathed along the edges with special boxes, the body of which is created directly from polyurethane foam. Layers are laid sequentially on top of this structure:

• foam rubber;
• then felt;
• and then the batting.

Not only sofas are equipped with a Bonnell spring block, but also mattresses, which are still quite popular today and are often purchased in stores

The desired system of blocks, although considered slightly outdated, is built into sofas that have various transforming mechanisms, for example:

• Eurobooks;
• accordions, etc.

The service life of dependent spring mechanisms is at least 10 years, at least this is the guarantee you can expect from manufacturers. However, this period will only be relevant if you buy a really high-quality design, in which not only the springs, but also the other segments of the body can be used for many years, while maintaining elasticity, integrity and original quality.

Unfortunately, from an orthopedic point of view, such sofas are not considered a healthy place to sleep.

However, it must be said that structures of this type have very poor characteristics from an orthopedic point of view. Yes, they can be comfortable, but it is really difficult for the body to relax on such springs. Sleeping on a sofa with a block of dependent springs on an ongoing basis cannot be called useful. Over time, constantly being “in the arms” of such sofas will lose your original comfort, as you will begin to feel constant tension and painful discomfort in those parts of the body where there were none before.

However, if we are talking about buying a sofa that will only equip an area for evening relaxation and receiving guests, this option can be considered quite acceptable, since it is inexpensive and can create a certain atmosphere of relaxation.

Type No. 2 – independent springs

According to data provided by orthopedists in our country, we can get the most physiological sleep on sofas, which have a built-in block of independent springs that is much more suitable for our body and health in general.

The difference between dependent and independent spring blocks can seriously affect your health

Such sofas are actually capable of creating for our musculoskeletal system, that is, the skeleton and muscle tissue, the most optimal conditions for relaxation, which in the future will turn out to be the safest.

So, a person who sleeps on furniture with such blocks every day will note that he:

• sleeps well;
• restores strength;
• feels only cheerfulness in the body and no negative sensations.

Independent type springs make the sofa many times more comfortable and healthy as a bed for sleeping and simply relaxing.

Prices for various types of Eurobook sofas

Eurobook sofas

The operating principle of the spring block we are considering is strikingly different from the dependent system of metal twists. So, if you act on only one of its component spring cups, the rest will remain unaffected.

The impact exerted on one of the springs does not in any way affect the elements next to it, which ultimately makes it possible to maintain the “weak” areas of the human body

Due to this feature, optimal retention occurs:

• lower back of the human body;
• other problem areas of the body.

Of course, this type of spring blocks is much more expensive than the one we described above, and this is due to its great benefits for human health, which justified the initially high costs of the manufacturer.

Differences in the design features of the spring block of independent and dependent types

We can say that blocks of independent springs are as universal as blocks of dependent ones, and that they can be built directly into sofas equipped with any type of transformation mechanisms, so if you still prefer a more expensive option, you can find the most attractive sofa model.

This spring design has many different features

Quite often, accordion-type sofas are also produced, into which independent blocks are built. In addition, they can be installed not only in the piece of furniture under discussion, but also in mattresses, armchairs and other interior elements.

Features of independent spring blocks

The more springs your sofa contains, the more expensive that particular model will be. However, at the same time as its cost, the convenience of using the sofa bed will also increase, regardless of whether you sleep on it all the time or just sit down in the evenings in front of the TV with a cup of aromatic tea.

A sofa in which there is a block of the type we are interested in can simultaneously accommodate several people, and they, sitting even close to each other, will not roll into the area of ​​greatest pressure, precisely due to the tearing of the canvas.

The most inexpensive models of sofas with an installed block of independent springs are those that have only about 250 springs. Models that are more expensive are usually equipped with a number of springs equal to approximately one thousand.

A block of independent springs can be called a real orthopedic breakthrough in the field of equipping upholstered furniture

The technique for creating an independent type of spring block is called a multipack. Of course, you can’t create it at home, however, we can still look at the instructions for making it, which may help specialists in this field.

Instructions: how to assemble an independent spring block

Step No. 1 – determine the parameters of the elements of the spring block

So, the first step will be to calculate what kind of mattress you want to make. To do this, we define in the following sequence:

• number of springs;
• diameter of steel twists;
• number of turns;
• size of packages for springs.

To sew a spring block, you first need to calculate all its parameters, for example, determine how many springs per square meter you will make to equip the future sofa

This sequence is correct, since the diameter of these elements, the number of turns with which they will be represented, as well as the size of the covers or fabric bags that are put on these springs will depend on the number of springs placed in a specific area of ​​the sofa.

So, most often the diameter of the springs varies between 2 and 6 centimeters, the maximum number of turns in the height of the spring is 8 units, and the filling of springs per square meter of the sofa can range from 250 pieces to 1200.

It is believed that the most optimal number for such spring blocks is a system in which there are at least 435 springs. If there are fewer of them, sleeping on the sofa will no longer be so comfortable. In addition, in a minimal amount, springs, even with all the positive effects they provide, will not last too long.

Remember, the more springs, the more comfortable it will be to sleep on the sofa, which means it’s better to increase their number, if possible

In addition, you, as a manufacturer, will only benefit if you install more springs in the unit, since in this case you can legally increase the price of your sofa by a significant amount.

Step No. 2 – making fabric covers

So, now we will need to form textile pockets with the same parameters using the given technology. Initially, they go separately from each other, but a little later, when they are all ready, they are connected to each other. It is in this gentle way that all parts of the system are connected, which allows you to leave the springs disconnected from each other and provide all those amazing positive effects that we are talking about in this article.

The manufactured covers must completely match the parameters of the springs, since otherwise they will quickly deform and fail, which will also complicate the use of the unit by its owners

Step No. 3 - manufacturing and installation of springs

At this stage, the springs included in the block are manufactured and installed. Of course, the springs will be different in each case, since, as we said above, their parameters depend on several different factors.

Make sure that the springs and fabric pockets fit together, and you can place the metal twists inside the bags provided for them

After the springs are made, they are secured inside the fabric pockets. Each spring has a separate pocket. Inside the pocket, this part is fixed, and the fabric shell itself is closed. Hurray, our independent spring unit is ready, you can install it in either a mattress or a sofa!

Please note: you may not know, but springs manufactured in factories can have not only a barrel shape, as in the pictures above, but also an hourglass. In their latest form, they are used by the nationwide manufacturer of upholstered furniture and mattresses, Ascona.

Type No. 3 – snake

This type of spring block belongs to the category of traditional and simplified mechanisms. Its design involves fixing all available springs relative to a specialized frame. This structure of the system gives it reliability and the necessary rigidity, creating that same repulsive effect of springs.

Soft material is placed on top of the snake, for example, felt and foam rubber are excellent.

The snake spring block is a budget option, which, however, is rarely used for equipping sofas, since it does not withstand loads

The desired type of spring blocks can be used both for sitting and, in fact, for the back of the sofa. Unfortunately, such non-trivial versatility is overshadowed only by the fact that the “snake” type block is characterized by instability to loads, and that is why during operation, especially intensive use, it quickly begins to lose elasticity and sag.

That is why this design is used for sofas as rarely as possible. The required block is not suitable for sleeping at all.

Unfortunately, the snake is prone to rapid deflection, therefore, it is rarely used as a spring block for sofas

PPU

Polyurethane foam (PPU or furniture foam rubber) is an inexpensive and highly elastic furniture filler. Provides a comfortable fit, has good elasticity and is environmentally friendly.

For the base of a sofa with such filling, as a rule, block furniture foam rubber is used, cut and twisted in a certain way. Some models require special molded polyurethane foam blanks, which are also used as a filler for pillows - the material allows you to hold any shape given to it.

The PU foam filling in the sofa comes in different brands - standard, luxury PU foam, memory foam foam, etc. The higher the properties of the material, the more expensive the sofa will cost to manufacture.

If you love comfort no less than savings, pay attention to the PU foam filler for a luxury sofa (artificial latex). Its basis is polyurethane foam of particularly high elasticity.

Viscoelastic polyurethane foam is a separate type of polyurethane foam that has a unique orthopedic “shape memory” effect. A mattress or pillow filled with such material reacts to pressure and heat, remembering the shape of your body. Press the surface with your palm and release - the dent will disappear very slowly.

Before buying a sofa or mattress, be sure to find out the density level of PU foam - a seat with an indicator of 28-30 kg/cubic meter will provide not only comfort, but also the durability of soft furniture elements. At the back the density should be no lower than 22-25 kg/cub.m, and for the armrests - 20-22 kg/cub.m.

Common features of different designs

Upholstered furniture, the seat of which has a spring base, regardless of what type of assembly is chosen by the manufacturer, has a steel spiral inside.

The common ones are:

• The designer’s efforts to create a model that is updated in shape, but still capable of providing a person with complete rest.
• The springs can withstand loads and there is no discomfort during sleep.
• Shaping surfaces to fit a figure.
• Long service life without deformation.
• No squeaks.
• The filler is high quality and environmentally friendly.

Sofa manufacturers are trying to produce products at prices affordable to all categories of buyers.

Highlights

Furniture springs are assembled using different assembly methods.

Therefore it turns out different:

1. Orthopedic property . In independent designs this effect is more pronounced.
2. Bonnels connected by wire can be pressed through under load in one area and in the rest; mattresses have insufficient ability to take the shape of the body.
3. Spirals are laid on materials of different quality and composition; the principle of fastening is different in all models.
4. A sofa with a “snake” cannot be folded out ; they begin to sag from long-term use.
5. Seats with independent springs are raised too high , which is inconvenient for sofas, more suitable for beds.

It must be taken into account that furniture with the highest orthopedic properties is not a therapeutic instrument by its intended purpose; it only relieves muscle tension and gives rest to the organs.

Features of the bonnel

This is a continuous weave spring block. It has a specific shape in the form of sleeping springs, the radius of the coil support gradually decreases. This is done so that the coils do not touch, rub or creak.

To prevent self-twisting, the spirals are secured with special locks on the first and last turns.

If we talk about the orthopedic effect, then it is lower than that of an independent block. After all, this design resembles a hammock in its operating principle. When lying down on a sofa, not only the springs on which the person is lying are compressed, but also the neighboring ones. Therefore, the repetition of the body shape here is conditional.

Such sofas will sag over time and lose their elasticity.

Operating rules

In order for the spring block to last longer, you need to follow the basic rules for handling upholstered furniture:

• do not stand on the sofa with your feet, so as not to create a point load in one place;
• do not jump on it from a running start, so as not to damage the mechanism;
• carefully lay out and fold furniture to prevent deformation of the frame;
• If creaks appear or the sofa sag, immediately carry out repairs (on your own or call a specialist);
• When rearranging, do not drop or shake the sofa.

Careful handling of the sofa will increase its service life.

The more carefully the furniture is used, the longer it will serve its owners.

Disadvantages of the “snake” spring block

There were no obvious shortcomings in furniture with these springs.

Among the negative aspects of springs are their poor shock-absorbing properties. For example, when a person sits on a sofa, it quickly sags under the influence of his weight. When trying to stand up, the person sitting sinks even further into the surface of the sofa. Especially obese and elderly people may find it difficult to quickly stand up on their own.

And also at the first stages of using such furniture, this fact will be inconvenient for lovers of hard surfaces. However, this drawback is not critical and you can get used to it.

Thus, snake spring blocks have gained popularity both among buyers and among furniture assemblers. They have excellent performance characteristics and will serve the owners for many years, to the delight of their owners. Taking into account the pros and cons of these designs, you can decide whether such furniture is suitable for you.

Which company is better to buy a sofa for sleeping every day?

Top 10 sofas

• MOON Trade, model Dublin 124.
• letto, Gotland model
• Ikea, model Lidgult
• Ascona, Amani model.
• Hoff, Pittsburgh model
• Pinskdrev, model Melissa
• Mebelico, model Manchestor
• Anderssen, model Madison

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Soft synthetic fillers

They are good because they do not cause allergies and allow air to pass through, so they do not harbor germs. Such fillers differ in the way the fibers are laid.

Struttofiber

This sofa upholstery is made from synthetic and natural fibers. They are laid in a vertical position and fastened with hot air.

— struttofiber makes the sofa elastic;

- allows air to pass through well;

- the fibers act in the same way as springs in an independent unit - each cell works separately. Therefore, struttofiber padding is beneficial for the spine;

- does not burn and does not cause allergies;

- such a sofa will last a long time.

Holofiber

The material is made by twisting and splicing synthetic fibers. The result is a spiral filler that allows air to pass through well.

- keeps its shape and remains warm;

— does not crumble under the influence of the sun;

— does not retain odors and does not spread fungus;

Durafil

Durafil is a high quality non-woven fabric. It is created from polyester - hollow fibers that are arranged vertically.

- the material is elastic;

- does not cause allergies and does not burn;

— germs and dust mites do not appear in Durafil.

Sintepooh

To obtain synthetic down, manufacturers comb and twist polyester. The result is a material that looks like natural fluff. After treatment with silicone, the fibers are joined.

- voluminous and soft padding;

— synthetic fluff is obtained in the form of spirals, so it retains heat and shape well;

— germs and fungus do not form in a sofa with synthetic down.

Sintepon

This synthetic filling for upholstered furniture is made from polyester fibers. In furniture it is often used with other fillers and installed immediately before the upholstery.

It does not hold its shape well and can shrink under heavy loads. There is no uniform standard in production, so buyers risk getting low-quality padding polyester that is harmful to health.

— does not absorb moisture into the fibers;

- not oxidized by oxygen.

Comforel

In the production of this hollow fiber, no adhesives or polymer emulsions are used, so sofas with comforters are considered safe. Comfortable furniture and pillows are recommended for children and pregnant women.

— does not cause allergies and is environmentally friendly;

— a sofa with such padding is hard and at the same time restores its shape well;

— the comforter does not pill after several washes;

— does not burn, there are no parasites in it;

Viscoelastic foam

This filler was created by NASA for space programs. It repeats and remembers the contours of the body.

When the load is removed, the foam slowly returns to its original shape. This occurs due to a reaction to body temperature.

— viscoelastic foam evenly distributes weight over the surface of the sofa. This is good for the spine;

— absorbs up to 90% of the energy that acts on it;

- cushions well, but does not allow air to pass through well.

The design and principle of operation of the sofa folding mechanism Book

A sofa with a book mechanism is designed as simply as possible. The basis of the design is a lever and a plate. The elements are mounted so that they are fixed to both components of the sofa. The lever design determines the type of sofa.

There are 3 types:

• option with flat cheeks - without shelf. The design provides lower seat support;
• mechanism with a shelf - here an additional corner appears to support the seat, but the folding mechanism still provides only 2 positions;
• “click-clack” – the design of the levers involves 3 fixations, which is an additional advantage.

All types of fastenings are very easy to repair and replace.

Lay out the sofa like this: raise the seat until it is in a horizontal position. Press down on the seat until a characteristic click is heard - this locks the locking mechanism. The seat is also lowered to a horizontal position. A horizontal backrest takes up space, so the sofa cannot be placed next to a wall or must be moved away before unfolding. This is a design flaw.

Fold furniture in the same way. Raise the seat again until a click is heard, then lower the seat to its normal position. In this case, the back should rise and take a vertical position.

Based on the number of positions, there are 2 types:

• regular book – accepts only 2 provisions;
• “click-clack” is an improved version. Accepts 3 positions: in addition to “sitting” and “lying” there is a “half-sitting” position.

The advantage of any option is an extensive linen drawer. Not only bedding is stored here, but also blankets, pillows, and blankets.

The folding mechanism is very simple and reliable. Breakdowns are rare and can be easily fixed with your own hands.

Most often, the guide bar rivets break. The bolts that hold the lever and plate together wear out or wear out. In this case, a gap appears, due to which the mechanism begins to malfunction and the layout is difficult. The rivet is drilled out and a new one is put in its place, or simply replaced with a bolt and nut of the appropriate size.

Another disadvantage of the device is the lever. If there is too much pressure, it bends, making transformation impossible or difficult. This happens if the fittings are installed too weak and do not correspond to the weight of the sofa and the expected load. The same breakdown is possible with too sudden movements while folding and unfolding the sofa.

To extend the “life” of the sofa, it is recommended to periodically lubricate the transformation mechanism with machine oil and clean it from collected dust and dirt.

Who will be the best for each model?

It is impossible to imagine the decoration of rooms without upholstered furniture . A person with a bad back is better suited to a hard sleeping place; a mattress with an independent spring filler is endowed with all the properties for this case.

Bonnell is also hard and elastic, but distributes the load worse. “Snakes” have the lowest orthopedic properties compared to similar products, poor shock absorption, but you don’t have to sleep there; you can choose an item solely for watching movies.

In any case, you must follow the doctor's recommendations if you have problems with the musculoskeletal system or the spine. Healthy people pay attention to the price, appearance and manufacturer's company. But you need to look at the totality of properties of a commercial product, its structural components and internal structure.

Let's sum it up

Thus, it is possible and necessary to use spring blocks for convenience and comfort. The main thing is to understand that a low-quality product will not bring you joy, even if you save a lot. Therefore, before purchasing, weigh the pros and cons of specific furniture again, and only then go to the store.

Reupholstering a sofa is a rather difficult process, but sometimes necessary. Any upholstered furniture takes on a very unsightly appearance over time, and the sofa is no exception. Various damage and irremovable stains may appear on the upholstery, which makes it necessary to replace it. We will consider this issue in more detail in a special article.

Video - How to choose a mattress for an accordion sofa