Abstract: A mechanism for adjusting the seat of a chair as a result of changing the tilt of the backrest with respect to the seat is provided. The mechanism has a backrest frame and a base frame, as well as a covering element stably combined with the base frame and forming part of the seat. The backrest frame is rotatably constrained to the base frame around a respective rotation axis and tilting with respect to the seat between a position (P1) of minimum tilt and a position (P2) of maximum tilt. Advantageously, the covering element is partially elastically deformable, with the mechanism having deforming means operated by the backrest frame in order to reversibly deform, in the vertical direction, when the covering element as a function of the tilt angle with backrest frame has reached with respect to the position (P1) of minimum tilt.

Abstract: Furnishing elements which include a frame having at least a first and a second wall incident to each other so as to identify an edge, at least one covering associated with and superposed on said frame so as to cover at least partially said walls and said edge are provided. The frame, in correspondence with said edge, may include an attachment element which delimits an attachment seat open in the vicinity of said first and second wall, wherein the covering includes at least two flaps folded and inserted inside the attachment seat, and wherein said attachment seat locks the flaps on the inside against the inner walls of the seat itself. Corresponding methods for covering furnishing elements are also provided.