A springing and wrap-around element for a seat and/or backrest, comprising a pair of lateral supporting means, and a flexible blade consisting of a convex central portion and two side walls extending obliquely outwards from the central portion and secured to respective supporting means via hinge connecting...http://www.google.sh/patents/US5022709?utm_source=gb-gplus-sharePatent US5022709 - Springing and wrap-around element for a seat and/or backrest, and seat embodying the same
