Patent ID: 7641281

Claim:
A vehicle seat having a backrest comprising: a backrest middle part of the backrest; backrest side parts, which extend forward laterally from the backrest middle part and provide lateral upper body support; an internal section of each of the backrest side parts, connected to the backrest middle part and an external section of the backrest side parts connected thereto, which overlaps a forward area of the backrest side parts, the backrest side parts being situated to be adjustable in relation to the backrest middle part wherein a backrest width is changeable by fixing the backrest side parts; wherein the internal section and the external section are formed in one piece from a foam material, a stiffening element selected to give the external section a desired rigidity being foamed into the internal section and into the external section, the stiffening element extending at least across a transition area from the internal section to the external section, and having rigid first and second legs forming a hinge extending from the internal section.