Patent ID: 7111713

Claim:
A system for absorbing an impact, said system comprising: a blow molded thermoplastic energy absorbing member comprising; opposing first and second walls defining a hollow space; a plurality of fused pairs of recessed ribs, each said fused pair comprising first and second recessed ribs; said first recessed rib is integrally molded from said first wall and having a first recessed rib end; said second recessed rib is integrally molded from said second wall and having a second recessed rib end; said first and second recessed ribs being integrally fused at a welded surface disposed between said first and second recessed rib ends, said first and second recessed ribs being symmetrically disposed upon either side of said welded surface; an average distance from said first wall to said welded surface is about approximately 15.0 to 45.0 mm; an average distance from said second wall to said welded surface is about approximately 15.0 to 45.0 mm; said hollow space having an average height between said first wall and said second wall of about approximately 30.0 to 90.0 mm; said first recessed rib and second recessed rib are constructed to be permanently crushed in the process of absorbing the impact energy; and a swelling part disposed in said first recessed rib end.