Patent ID: 6361085
Filing Date: 2002-03-26
Classification: F16L,Y10S

Abstract:
A flanged connection fastener bending stress reduction apparatus, comprising:first and second flanges in facing relationship, said first flange having a plurality of fastener holes therethrough, said second flange having a plurality of complementary fastener holes therein; said first flange fastener holes having a radially tapered surface on the back face of said first flange, said radially tapered surface being only adjacent said first flange fastener holes; a fastener extending through said first flange fastener holes; said radially tapered surface of said first flange fastener holes configured to minimize bending stress on said fastener when said fastener is tensioned; said fastener including first and second preload retaining means, said radially tapered surface adjacent said first flange fastener holes engaging said fastener first preload retaining means; and, said fastener first and second preload retaining means engaging said first and second flages, respectively whereby tensioning of said fastener preloads said fastener and maintains said first and second flanges in preloaded abutting relationship.