Patent ID: 7736721
Filing Date: 2010-06-15
Classification: B29C,B29K,B29L,E04C,Y10T

Abstract:
1. A hollow structural member, comprising: a top wall having an inner surface and an outer surface; and a bottom wall opposing the top wall so as to define a void therebetween, the bottom wall having at least one bulwark formed therein, the at least one bulwark having a leading face which is joined to the inner surface of the top wall to form a double-walled bulwark bridging the void, the double-walled bulwark having a u-shaped reinforcing member with top and bottom edges extending laterally across the hollow structural member between the opposing walls so that neither the top nor bottom edges of the reinforcing member are visible from outside the top or bottom walls of the hollow structural member, the u-shaped reinforcing member also extending between the inner surface of the top wall and the bottom wall, and being encapsulated by the top wall, the bottom wall and the double-walled bulwark, the bottom wall having an outer surface that includes a notch that remains after the bulwark is formed.