Abstract: A chair has a seat and a backrest, a structure supporting the seat, and a base. The support structure has two lateral uprights and at least one projecting element provided with a substantially longitudinal guide. The backrest is associated with two angled elements; each of the angled elements has a first end connected to the backrest, a central part connected rotatably by a first hinging pin to a top end of one of the uprights of the support structure of the seat, and a second end connected by a second hinging pin to the seat. The seat is connected to the support structure by a telescopic rod, which can be shortened and lengthened in a resilient manner, and an element which can be slidably engaged in the guide of the projecting element.

Abstract: A chair with a seat and a backrest, a structure supporting the seat, and a base; the support structure has two lateral uprights and at least one projecting element provided with a substantially longitudinal guide, and the backrest is associated with two right-angle elements; each of the right-angle elements has a first end connected to the backrest, a central part connected rotatably by means of a first hinging pin to a top end of one of the uprights of the support structure of the seat and a second end connected by means of a second hinging pin to the seat; the seat is connected to the support structure by means of a telescopic rod, which can be shortened and lengthened in a resilient manner, and an element which can be slidably engaged in the guide of the projecting element.