Patent ID: 6484385
Filing Date: 2002-11-26
Classification: B21D,B23P,F24F,Y10T

Abstract:
A method for manufacturing self-sealing reinforcement tie rods for reinforcing HVAC ducts, said reinforcement tie rods each including an elongated threaded rod having fastened inwardly of each of two opposite longitudinal ends thereof an abutment structure comprising an elongated hollow tubular body having an unthreaded bore therethrough for insertably receiving said rod, said tubular body having a longitudinally inwardly located tubular crown portion and a longitudinally outwardly located, radially outwardly protruding flange portion, said method comprising;d. inserting a first end of said rod into said bore of said abutment structure from said tubular crown portion side of said abutment structure to a predetermined protrusion distance longitudinally outwardly of said flange portion of said abutment structure, and e. indenting a cylindrical wall surface of said tubular crown portion of said abutment structure sufficiently far for an inner cylindrical wall surface thereof to form a crimping engagement with said threads of said rod, said crimping engagement comprising forcing a portion of said inner cylindrical wall surface of said tubular crown portion to deform into indentations of said threaded rod.