105- 108 degrees is more relaxed and can produce ergonomics close to the natural waist. The best reading angle is10/-104 degrees: 103- 1 12 degrees.

Judging from the situation of the human spine. When sitting, this angle is appropriate at 1 15 degrees: the backrest angle prevents the seated person from sliding forward and guides the bent part (including the sacrum) to lean against the backrest. When the back is backward, the angle between the chair surface and the backrest of the work chair should be designed according to the curve of the human back, which is about 100 degrees, so the backrest of a comfortable work chair is curved.

Precautions for chair backrest:

If there are two handles under the seat of the office chair, one handle is used to adjust the height of the chair and the other is used to adjust the angle of the back of the chair. If you want to adjust the backrest, you can adjust the corresponding handle.

But if you don't know which handle is used to adjust the backrest angle, you should try one handle at a time to see which handle is used to adjust the backrest. Then adjust the angle flexibly according to your own needs.

In addition, the height adjustment of the office chair is actually very simple, and it needs to be combined with manual and fuselage to adjust the height. People sit in a chair, reach out and touch the joystick under the chair, lift it up, and use the weight of their bodies to put the chair down. Conversely, it is the same to lift the chair, except that people should not sit in the chair, lift their bodies away from the chair a little, and then lift the operating lever.