US Patent 9821751 Airbag module

An airbag module for protecting an occupant of a vehicle. The airbag includes first and second inflatable chambers. Each of the first and second inflatable chambers is formed by separate front and back panels. Each of the front panels is connected to one of the back panels along a peripheral seam. The airbag is assembled by overlaying the panels on top of each other creating a simple two-dimensional structure for assembly. An inflator is provided for supplying inflation gas to the first chamber of the airbag. The first and second inflatable chambers are connected by a gas flow passage so that gas for inflating the second chamber can flow from the first chamber through the gas flow passage into the second chamber.