| 摘要 |
An active bolster has a plastic-molded, expandable inner wall and a plastic-molded outer wall overlying the inner wall are joined around a closed perimeter region to form an inflatable bladder. One wall surface includes a plurality of upstanding, concentric ribs within the closed perimeter region for providing attachment between the inner and outer walls which is preserved during inflation of the inflatable bladder. The concentric ribs include an innermost rib and an outermost rib. Each concentric rib has a respective window, wherein the windows are respectively offset to provide a to serpentine path through the concentric ribs from the central volume to atmosphere outside the outermost rib. At least one of the windows is closed by a breakaway seal configured to prevent flow of the inflation gas through the serpentine path until it ruptures at a predetermined pressure during inflation of the inflatable bladder.
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