Abstract: The invention relates to a chair, especially an office chair, having a seat part and a downward-slanting guide track for furnishing a combined downward and rearward motion or a combined upward and forward motion for the seat part. The seat part accordingly slides along a predetermined guide track, in many cases in cushioned fashion, to the rear and downward. To improve the ergonomics of such a chair, a swiveling device with an at least horizontal pivot shaft can be provided for pivotably disposing the seat part; the swiveling device is disposed between the seat part and the guide track, and the swiveling device is disposed so as to be movable together with the seat part along the guide track. As a result, a combined motion of the seat part can be generated, which is composed of the cooperation of the predetermined guide track and the swiveling motion about the pivot shaft of the swiveling device.

Abstract: An office chair with a pedestal (14) and, attached thereto, a seat carrier (13) that carries a seat element (10) and that can be shifted with relation to the pedestal (14) out of an initial position (a) against the restoring spring force along a guide track that when the chair is inclined rearwardly relative to the vertical direction. To improve sitting comfort, the increase in the restoring spring force along the shifting path in a first shifting path segment adjoining the initial position is greater than in a second shifting path segment that is spaced away from the initial position (FIG. 2).