An office chair mounted on a five-arm undercarriage and caster wheels made from a material of which is appropriate for the type of floor on which the chair is used, is commonly available today. Chairs mounted on glides are also beginning to appear on the market. Conference chairs have either four legs or are designed as “spring chairs”.
The seat must be wide and deep enough and you should sit on its full depth. It must be rounded at the front. The backrest should continually support the back over its full length. The height-adjustable backrest should be adjusted so that its curved part provides support to the spine in the lumbar zone.
The backrest should copy the contour of the back
The angle between the backrest and seat should not be less than 90 degrees even in the most frequently used front position. Only then is it possible to prevent putting a strain on the respiratory and digestive system as well as the heart and blood vessels.
Seat height adjustment
The chair must enable the height of the seat to be changed so that the feet can be in full contact with the floor, with the knee joints bent at an angle of 90 degrees.
Adjustable armrests, preferably with optional lateral movement
Multifunctional arm-rests, which are adjustable in width, depth and height as well as in a radial direction, provide maximum comfort for the user.
Every chair should be have this feature. It should absorb shocks caused by sitting down quickly as well as all other movements of our body.
Heavy-duty upholstering or another type of covering material. It must correspond to the frequency of use and the environment in which we want to use the chair. The most important physical properties are resistance against wear and "pilling", colourfastness, as well as fire resistance, if required.
Chair mechanism components are a special interest chapter:
Healthy or so called dynamic sitting that enables us to remain in constant motion can be achieved using chairs equipped with a synchronous action mechanism, which automatically adapts the backrest and seat to the motion of our bodies. This type of chair protects our bodies from becoming stiff. It can reduce static load and fatigue to our back muscles and promotes their activation and relaxation. When selecting a chair, it is very important to carefully consider the specific type of chair that will best suit the anticipated way in which it will be used.