A vehicle seat with a back rest comprises a gas bag, which is located in the back rest in a folded state, and a gas source to inflate the gas bag. It further comprises an accomodation at the upper side of the back rest and a supporting casing, which is inserted in the accomodation....http://www.google.co.uk/patents/US6030036?utm_source=gb-gplus-sharePatent US6030036 - Vehicle seat with gas bag located in the back rest
