The sofa has three states - high back sofa, ordinary sofa and low back sofa. They all have different functions for the living room. It can be said that each has its own merits.
The low-back sofa is a rest-type light chair that supports the user's waist (ie, the lumbar spine) with a support point. The height of the backrest of the sofa is relatively low, generally about 370 mm from the seat, and the angle of the backrest is also small, which is not only convenient for rest, but also makes the whole sofa move more convenient, light and small, and occupy a small area.
Ordinary sofas are the most common type of clothing that is mostly sold on the market. It generally has two support points for the lumbar spine to obtain a curved surface that matches the back of the body. The angle between the backrest of the sofa and the seat surface is critical, and the angle between the backrest of the sofa and the seat surface is too large or too small, which will cause tension and fatigue of the user's abdomen.
Similarly, the width of the sofa seat surface should not be too large, the width of the seat surface is generally required to be within 540mm, so that the sitting position can be adjusted at will, the rest is more comfortable, and the waist can be prevented from being emptied, and the back pain is not caused.
The high back sofa is also known as the aviation seat. It is characterized by three fulcrums that allow the person's waist, shoulders, and back of the head to lean against the curved backrest at the same time. These three support points do not form a straight line in space, so the technical requirements for making such a sofa are relatively high, and the selection difficulty at the time of purchase is relatively large.
To make a wooden frame for a high-back sofa, it is necessary to clearly make a turning surface composed of three points on the shelf. Otherwise, it is difficult to ensure the position of the supporting point when performing a process such as a sofa masking, which gives the user an uncomfortable feeling. When purchasing a high-back sofa, pay attention to whether the three support points on the back side are reasonable and proper, and can be judged by the test stand. The high back sofa evolved from a lounge chair. In order to improve the rest performance, it can also be equipped with a footrest. Before placing the sofa, the height can be the same as the front edge of the sofa seat.
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