Folding chair

Abstract

A folding seat includes a substantially upside-down “U” shaped fixed structure. Respective articulated support frames support the fixed structure on the ground and are constrained on each of the two vertical sides of the “U”. The chair further includes a seat constrained in an articulated way to one of the two support frames. The chair includes a chair backrest, which is constrained in an articulated way to the seat, and which is so positioned that when the chair is folded, the chair folds against the seat, and when the chair is unfolded, the chair is in a substantially vertical position, or is tilted by a few degrees with respect to the vertical.

1 . A folding chair, comprising:
 a substantially shaped like an upside down “U” shaped fixed structure, to which respective articulated support frames supporting the fixed structure on the ground are constrained on each of the two vertical sides of the “U”, each frame being configured to rotate relative to a corresponding vertical side, so that both frames, when the chair is folded, are inside the fixed structure and, when the chair is unfolded, are substantially orthogonal to said structure,   a seat constrained in an articulated way to one of the two support frames, said seat being coupled to an other of the two support frames when the chair is unfolded, and said seat being held inside a free space obtained within the frame to which the seat is constrained when the chair is folded, and   a chair backrest constrained in an articulated way to said seat, and so positioned that when the chair is folded, the chair is folded against the seat within a central space not occupied by the frames, and when the chair is unfolded, the chair is in a substantially vertical position, or is tilted with respect to the vertical, above said horizontal side of the fixed structure, and is held in position by a lock.   
     
     
         2 . A folding seat according to  claim 1 , wherein said backrest rotates about an axis parallel to a rear horizontal side of the “U”, 
     
     
         3 . A folding seat according to  claim 1 , wherein said lock comprise two vertical bars between which said backrest is constrained, which rotate relative to the seat through respective pins inserted at rear corners of the seat. 
     
     
         4 . A folding chair according to  claim 1 , further comprising at least one sleeve associated with an upper horizontal section of the frame integral with the seat, and wherein on an opposite side of the seat at least one hook engages the upper horizontal section of the opposite frame, into a suitable housing.