Patent ID: 8894150

Claim:
A Chair comprising: a base structure bearing a seat, wherein the base structure comprises two side components from which a front leg and a rear leg extend; a tilting backrest, wherein the tilting backrest comprises a supporting surface and two tubular uprights connected to the base structure; and a pair of joints, whereby the tilting backrest is connected to the base structure and allows a movement of the tilting backrest between a rest position and a backward tilted position under a backwards push, wherein: each joint comprises an inner curved component and an outer curved component, the inner curved component and the outer curved component each having circular profiles and coupled together telescopically along a common axis running along a shared centerline of the inner curved component and the outer curved component, the inner curved component and the outer curved component formed into an arc centered on an axis which defines a tilting axis of the tilting backrest; the inner curved component comprises a bent metal bar forming an arched portion and a fastening portion, the fastening portion fixed to the corresponding side component of the base structure; the inner curved component further comprises an arched sleeve of plastic material applied on the arched portion of the bent metal bar, the arched sleeve comprising a guiding outer surface of circular cross section; and the outer curved component comprises a fastening portion being inserted and fastened inside the respective tubular uprights of the tilting backrest, a rectilinear tubular portion extending from a lower end of the fastening portion, and an arched portion extending from the rectilinear tubular portion and comprising an inner surface with a circular cross section coupled in a sliding guiding manner with the guiding outer surface of the corresponding arched sleeve.