Abstract: A synchronizing mechanism for correlated seat/backrest motion of an office chair is provided with a base carrier to be placed on a chair column; a seat carrier, which is pivotable about a transverse axis and, at its front end, articulated to the base carrier; and a backrest carrier, which is also pivotable about a transverse axis and articulated to the base carrier. It is coupled with the seat carrier such that a backward pivoting motion of the backrest induces a lowering motion of the rear end of the seat carrier. The joint between the base carrier and the seat carrier is a turning and sliding joint so that the lowering motion of the seat carrier is combined with a horizontal sliding motion.

Abstract: A universal seat carrier panel for office chairs is provided with a panel member for arrangement of a chair column, a seat carrier or the like and with a slideway integrated in the panel member for adjustability of an arm-rest holder in the horizontal longitudinal direction with respect to the office chair.

Abstract: An adjustable-height armrest is provided with an armrest column, an armrest carrier which is telescopically displaceable in height on the column, an arm support located thereon and a catching system for fixing the armrest carrier with respect to the armrest column in graduated height positions. The catching system consists, on the one hand, of a double row, extending vertically in the armrest column, of mutually aligned latching recesses which are connected to one another via slots. A locking unit comprising two mutually engaging locking bolts which are displaceable relative to one another is also arranged on the armrest carrier. These locking bolts each have a latching head for the latching recesses and a narrower web adapted to the contour of the orifices. The webs are aligned with the orifices when the locking unit is released.