Impact absorbing member for vehicle

A system for absorbing an impact energy, said system comprising:

• first and second blow molded thermoplastic energy absorbing members;
• each of said first and said second energy absorbing members having opposing first and second walls defining a hollow space;
• at least one pair of coaxially joined first and second three dimensional ribs disposed within each said first and said second energy absorbing members, said first ribs being integrally molded from and directly connected to said first wall and extending from said first wall into said hollow space, said second ribs being integrally molded from and directly connected to said second wall and extending from said second wall into said hollow space so as to couple said first ribs;
• at least one welded surface fusing said first and second ribs at a junction disposed at an opposite end of said first ribs from said first wall and at an opposite end of said second ribs from said second wall, said at least one welded surface being directly disposed between and joining said first and said second ribs;
• and
• wherein said first and second energy absorbing members are aligned such that said at least one pair of coaxially joined first and second three dimensional ribs of said first energy absorbing member are coaxially aligned with said at least one pair of coaxially joined first and second three dimensional ribs of said second energy absorbing member so that said impact energy is distributed between said energy absorbing members and absorbed by said energy absorbing members;
• a projecting part is disposed in said first wall of said first energy absorbing member, and a receiving part for receiving said projecting part is disposed in the second wall of said second energy absorbing member such that when said projecting part mates with said receiving part, said first and said second impact absorbing members are aligned.