The seat depth dimension should meet the following three conditions:
a. the buttocks are fully supported
b. The waist is supported by the backrest
c. Leave a proper distance between the front edge of the seat and the calf to ensure that the thigh muscles are not squeezed and the calf can move freely.
The height of the armrest is preferably 200-250mm, and the front end of the armrest is slightly higher, and it inclines with the inclination of the seat surface and the inclination of the backrest.
In order to avoid excessive pressure under the thighs, the height from the front of the seat to the ground or the footrest should not be greater than the distance from the bottom of the foot to the bend of the thigh.
The inclination angle of the working chair seat surface is 0~5°, and the recommended inclination angle of the working chair seat surface is 3~4°.
A. The width of the backrest should be no more than 325~375mm.
B. The height of the backrest depends on the different functions of the chair. The backrest should not be too high. Usually, the shoulder rest should be set lower than the lower edge of the scapula, and the height is about 460mm.
The softness and hardness of the seat cushion: a certain cushioning of the seat surface is needed, because it can increase the contact area between the buttocks and the seat surface, thereby reducing the uneven pressure distribution, but the cushion is too soft will cause the following problems, the general seat cushion The height is 25mm.
The surface material of the chair cushion should be made of fiber material, which can be breathable and can reduce body sliding. Do not use plastic surface, it is not breathable, the surface is too slippery, making people feel uncomfortable.
Reduce fatigue caused by sitting for long hours;
Provide proper support to the spine;
Provide ease of sliding movement;
Can be adjusted according to height.
What is the adjustable range;
Whether it is equipped with a gravity sensor lock;
Whether the design is scientific and reasonable.