Patent ID: 6114012
Filing Date: 2000-09-05
Classification: B29C,B29D,Y10T

Abstract:
A channel-shaped rib of a composite material having, in an integral structure, a web extending in a lengthwise direction of the rib, and flanges formed on, and extending along, opposite lengthwise edges of the web to provide a channel shape; said rib comprising:a plurality of spaced apart first beads extending across the web, each of said first beads having an outer surface protruding outward from an outer surface of said web on a remote side from an interior space of said channel shape;a plurality of spaced apart second beads extending across each of said flanges, said second beads protruding inward from an inner surface of each flange on the same side as said interior space of the channel shape, each of said second beads having an inner surface protruding into said interior space and having an outer surface defining a recess formed in the outer surface of each of the flanges; andsaid second beads being positioned so as to merge with respective first beads.