Science and Education in Karakalpakstan issn 2181-9203 Science Magazine chief editor

Science and Education in Karakalpakstan. 2023 №2/1 ISSN 2181-9203 
20 
The sequence of transformation of the sofa into a bed. 
The sequence of transformation of the sofa into relaxation state. 
Pic. 2. The sequence of transformation operations. 
How to change the angle of the armrest: 
The sides of the sofa are transformed into armrests or headrests, compressed in the direction 
of the arrow, as shown in the picture. The sides are in three positions. If the armrest is in the raised 
state when using the sofa, the load on it should not exceed 40 kg (Pic. 3). 
Pic. 3. Transformation of the armrest. 
Mattresses made of polyurethane foam produced by the Andersen factory are used for sofas 
transformed by the tango method, 12 cm thick and with a density of 30-35 kg/m3. Such mattresses 
form a flat surface of the bed. The “Anderssen” factory also produces chair-beds with a “tango” 

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Science and Education in Karakalpakstan. 2023 №2/1 ISSN 2181-9203 
21 
mechanism. Its back has three positions: for lying, for resting in a relaxed position, and for sitting 
(Pic. 4). 
Pic. 4. Transformable chair-bed. 
Benefits of the tango sofa: 
−
the sofa can be easily transformable; 
−
the bed part is flat (there are no connecting seams); 

three positions of the speaker: for sleeping, for resting in a relaxed position and for 
sitting; 
−
armrests protrude as a headrest in the transformed state; 

there is a special place for storing bed expenses; 
−
a “tango” sofa takes up less space than a “click-clack” sofa. 
“Telescope”.
When choosing a sofa, it is necessary to pay big attention to the mechanism of 
its transformation. Sofa-transformer type “telescope” 

one of the most common and compact sofas. 
The transformation process of the sofa resembles a “telescope”, hence its name. There are also 
chairs with this type of transformation (Pic. 5). 
Pic. 5. Transformable sofa and telescopic armchair. 

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