Patent ID: 8419060

Claim:
A side airbag system comprising: a side airbag that includes an upper bag portion that is formed of a piece of upper base fabric and that is located on a vehicle upper side; a lower bag portion that is formed of a piece of lower base fabric and that is located on a vehicle lower side of the upper bag portion; a tether portion that is formed of upper regions of the lower base fabric and that serves as a partition between the upper bag portion and the lower bag portion; and a tube that is formed of a piece of tube base fabric, that extends through the tether portion to the lower bag portion and to the upper bag portion, that has an opening at one end located adjacent to the lower bag portion and an opening at the other end located adjacent to the upper bag portion, and that distributes inflation gas between the upper bag portion and the lower bag portion, wherein the side airbag is supplied with gas to inflate and deploy in the event of a side impact crash, a lower end portion of the upper base fabric is sewed to a bag outer surface at lower ends of the upper regions, used as the tether portion, in the lower base fabric, the tube is formed into a cylindrical shape in such a manner that the tube base fabric, sewed to the lower base fabric, is further sewed to the upper regions of the lower base fabric and folded toward a vehicle front side along a fold axis and then front ends of the folded tube base fabric are sewed together in a longitudinal direction of the tube, the tether portion is formed in such a manner that the upper regions of the lower base fabric folded along the fold axis are sewed together, and the upper bag portion is formed in such a manner that an outer periphery of the upper base fabric and another outer periphery of the upper base fabric are sewed together, and the lower bag portion is formed in such a manner that an outer periphery of the lower base fabric and another outer periphery of the lower base fabric are sewed together.