Abstract: The invention relates to a seat assembly for an office chair or the like, having a seat and back (6, 7) which are adjustable especially by shifting the body and having a cradle (5). The seat and the back are hinged together at their adjoining ends by at least a first articulation (8) and have, at points distanced from the articulation (8), bearing elements (13, 14) which are suspended or guided on the cradle by positive guiding means (10, 11) and are mounted for movement along paths established by the positive guiding means. The articulation (8) is free-floating. The bearing elements (13, 14) are guided by the positive guides (10, 11) independently of one another.

Abstract: A chair for an office or the like, having one seat and one back rest which are adjustable especially by body displacement, and having a support (24). The seat has a front seat section (28) and a rear seat section (30) which is connected pivotingly about a first, free-floating seat section about a second pivot axis (32) parallel to the first pivot axis but spaced apart therefrom. The front seat section is on the one hand displaceable by means of at least one supporting element (26) and at least one positive guide (25) along a path established by the positive guide, and on the other hand is suspended on the support for pivoting about a third pivot axis parallel to the first pivot axis but spaced away therefrom.