US Patent 9364092 Chair with a tilting backrest

A chair comprising a fixed support structure including a pair of front legs and a pair of rear legs, a seat fixed to said support structure, and a backrest including a backrest panel with an arcuate shape connected in a tilting manner to said fixed support structure, wherein said backrest comprises two side connecting elements of plastic material, each of which comprises a cylindrical sleeve fixed to an upper portion of a respective rear leg and a bellows-shaped deformable portion integrally formed with the respective cylindrical sleeve and connected in a fixed manner to a respective side portion of said backrest panel.