Chair with a tilting seat

Abstract

A chair with a tilting seat, comprising a monocoque structure including a seat and a backrest formed as a single piece of injection-molded plastic material, wherein the monocoque structure comprises at least one bellows-shaped deformable transverse band formed as one piece in the backrest, so as to divide the backrest into a lower backrest portion fixed relative to the seat and an upper backrest portion movable relative to the lower backrest portion between a rest position and a tilted position.

1 . A chair with a tilting seat, comprising a monocoque structure including a seat and a backrest formed as a single piece of injection-molded plastic material, wherein the monocoque structure comprises at least one bellows-shaped deformable transverse band formed as one piece in the backrest, so as to divide the backrest into a lower backrest portion fixed relative to the seat and an upper backrest portion movable relative to the lower backrest portion between a rest position and a tilted position. 
     
     
         2 . A chair according to  claim 1 , wherein the deformable transverse band extends between two opposite side edges of the backrest. 
     
     
         3 . A chair according to  claim 1 , wherein said deformable transverse band comprises a plurality of transverse ribs with a C-shaped cross-section, parallel to each other, with respective concavities alternately facing towards the front and towards the rear of the chair. 
     
     
         4 . A chair according to  claim 1 , wherein said deformable transverse band forms a stop that prevents a further backward motion of the backrest in a position of maximum backward inclination. 
     
     
         5 . A chair according to  claim 1 , comprising at least one opening in the backrest, which interrupts said at least one deformable transverse band in a transverse direction.