| Abstract |
The present invention relates to a chair comprising a support structure (12) comprising two metallic supports (18) with an inverted U shape, each having upper part (20), a forward inclined branch (22) forming a front leg and a rearward inclined branch (24) forming a rear leg and two transverse elements (26) whose ends are fastened to said metallic supports (18); a seat (14) carried by the support structure (12); and a backrest (16), characterized in that two box elements (28) each comprise a base element (30) made of bent metal plate with a channel shaped cross section, fastened to a respective metallic support (18) between the ends of said transverse elements (26) and a closing element (32) fastened to the base element (30) and positioned to close an open upper side of the base element (30) so as to form a closed box structure, wherein the backrest (16) comprises an elastically deformable bearing portion (62) having a non- , planar bearing surface (64) and fixed to two lateral connecting elements (66) which connect the bearing portion (62) to the support structure (12), each connecting element (66) having a reaction portion (70) which extends forwards relative to an articulation pivot pin (72) and is housed within the corresponding box element (28), the reaction portion (70) being articulated to said base element(30) around a transverse axis by means of the pivot pin (72) and being subject to action of elastic means (76) which tend to maintain the backrest (16) in a resting position and which contrast a rearwards thrust applied by the user against the bearing surface (64) of the backrest (16). |