Office chairs with piastre mechanism

Piastre

— seat height adjustment mechanism based on the operation of a gas lift — a reservoir filled with high pressure gas. The strength of this pressure is such that it is enough to raise an empty seat, but not enough to support a seated person. Thus, to reduce the height, you need to turn off the latch while sitting in the chair, and to increase it, do the same, but having risen on the seat. "Piastra" does not provide any other adjustments, except for height, and therefore is found mainly in low-cost models of chairs.