Folding chair with tilting backrest

Folding chair, comprising a first structure defining the front legs of the chair, a second structure defining the rear legs of the chair, a third structure defining the seat, and a backrest, in which:

• a) said three structures are provided with means for reciprocal articulation around a common axis,
• b) said means for reciprocal articulation include stop means interposed between said three structures which limit the angular movement of each of said structures with respect to another one of said structures, so that said chair is able to assume a folded flattened condition and an unfolded condition for use,
• wherein:
• c) said backrest is defined by a fourth structure separate from said three structures and pivotally mounted on one of said three structures around said common axis,
• d) spring means are provided between said fourth structure and said one of three structures to oppose a rotation of said fourth structure corresponding to a backward tilting movement of the backrest, and
• e) auxiliary stop means are provided between said fourth structure and said one of said three structures which limit the angular movement of said fourth structure with respect to said structure on which said fourth structure is pivotally mounted.