Abstract: Chair including a base structure, a seating structure having a seat of predetermined depth and a connecting structure for connecting the base structure and the seating structure. The base structure and the seating structure each include two coupling parts which extend along corresponding extension axes, and the connecting structure includes two connecting nuclei at the sides of the two structures, having a limited depth with respect to the depth of the seat. Each connecting nucleus includes two coupling counter slots which may interlock with the two coupling parts of the base structure and with the two coupling parts of the seating structure, respectively, along the extension axes of the above-mentioned coupling parts.

Abstract: An adjustable chair is described comprising a body supported by a base and having a frame constituted by two parts and hingedly connected together.The main characteristic of the present invention lies in the fact that it includes a mechanism having a first body hinged about a pin rigidly connected to the base and having its front end rigidly connected to the part associated with the seat, and a second body and having a rear end fixed to the part associated with the seat back and a front end connected, by spring means, to a central portion of the said first body.