Classification by function
The sofa can be divided into functional sofa, fixed back sofa, infinite self-control sofa, pneumatic sofa (i.e. manual sofa), electric sofa and sofa with TV according to its function.
The sofa has become a necessary furniture for many families. The sofas sold on the market generally include low back sofas, high back sofas and ordinary sofas between the first two. Here are three characteristics for consumers to choose.
Low back sofa: It belongs to the light chair of rest type. It supports the waist (lumbar spine) of the user with a support point. This kind of sofa has a low back height, which is generally about 370mm from the seat surface. The angle of the back is also small, which is not only conducive to rest, but also reduces the overall size of the sofa. This kind of sofa is convenient, light and small in floor area.
High back sofa: also called aviation seat. It is characterized by three fulcrums, so that the waist, shoulder and back of the brain simultaneously lean on the curved backrest. These three supporting points do not form a straight line in space, so the production of this sofa requires high technology, and it is difficult to select when purchasing. When making the wooden frame of the high back sofa, the turning surface composed of three points must be clearly made on the frame, otherwise, it is difficult to ensure the position of the support point during the process of covering the sofa, which will bring discomfort to users. When purchasing a high back sofa, you should pay attention to whether the composition of the three supporting points on the back is reasonable and appropriate, which can be judged by the test seat. The high back sofa evolved from a lounge chair. In order to improve the rest performance, it can also be used as a footstool, which can be placed in front of the sofa at the same height as the front edge of the sofa seat.
Common sofa: it is a common kind of sofa for family use. This kind of sofa is mostly sold in the market. It has two supporting points to support the user's lumbar and thoracic vertebrae, and can achieve the effect of matching the curved surface with the back of the body. The included angle between the backrest and the seating surface of such a sofa is very critical. Too large or too small an angle will cause the abdominal muscles of the user to be strong and fatigue. Similarly, the width of the sofa seating surface should not be too large, usually within 540mm according to the standard requirements, so that the user's lower legs can be adjusted at will to rest more comfortably.
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