Airbag(s) made of plastic film - for head, knee, or child restraint

摘要

To reduce weight, an airbag 100 is made of thin plastic film. Preferably, two layers 110 and 120 are made of different materials, like nylon, polyethylene, or polyester. These layers may be glued together; the outer layer may be Teflon (RTM). The airbag may be made of a number of tubes, which may be held together by a net 121; the net may be installed between inner and outer film layers. Kevlar (RTM) fibres may be sealed between the films, to strengthen them against tearing. (fig. 1C) The airbag may be used as a bag to protect knees, or a child sleeping across a seat. (fig. 4). This embodiment has a dedicated inflator - not shared with a head restraining bag. Fig. 6 shows deployment of a bag where a child seat is fitted. There are no vents in the film, as they would encourage tears; fig. 5 shows an inflation and deflation manifold. Port 515 and flap 516 control pressure within the airbag(s).