Method of making a plastic article having a metallic insert

Claim 1

THE METHOD OF MAKING A PLASTIC ARTICLE HAVING A METALLIC INSERT SECURED THEREIN AND PROJECTING THEREFROM, WHICH COMPRISES THE FOLLOWING STEPS: MOLDNG THE ARTICLE OF A THERMOSETTING PLASTIC RESIN OF A TYPE WHICH SHRINKS UPON COOLING, THE MOLDED ARTICLE HAVING A CYLINDRICAL HOLE THEREIN, PROVIDING AN ELONGATED METALLIC INSERT HAVING A TRANSVERSE CROSS SECTION AT A BASE PORTION DEFINING AT LEAST LONGITUDINAL AXIS OF THE INSET, THE DISTANCE FROM THE LONGITUDINAL AXIS OF THE INSERT TO EACH CORNER BEING BETWEEN ONE-HALF AND THREE THOUSANDS OF AN INCH GREATER THAN THE RADIUS OF THE HOLE IN THE ARTICLE; AND, FORCING THE INSERT LONGITUDINALLY INTO THE HOLE WHILE THE ARTICLE IS STILL HOT FROM THE MOLDING STEP TO POSITION THE BASE PORTION OF THE INSERT IN THE HOLE SO THAT THE REMAINDER OF THE INSERT PROJECTS THEREFROM, THE SHARP CORNERS OF THE INSERT SCORING THE SIDES OF THE HOLE AS THE INSERT IS FORCED IN TO PROVIDE AN INTERFERENCE FIT BETWEEN THE INSERT AND THE ARTICLE, THE THERMOSETTING RESIN SHRINKING ONTO THE INSERT UPON COOLING TO SECURE THE INSERT TIGHTLY IN THE HOLE AGAINST BOTH TORSIONAL AND LONGITUDINAL FORCES APPLIED TO THE INSERT.

Claim 2

THE METHOD OF MAKING A PLASTIC ARTICLE HAVING A METALLIC INSERT SECURED THEREIN AND PROJECTING THEREFROM, WHICH COMPRISES THE FOLLOWING STEPS: MOLDNG THE ARTICLE OF A THERMOSETTING PLASTIC RESIN OF A TYPE WHICH SHRINKS UPON COOLING, THE MOLDED ARTICLE HAVING A CYLINDRICAL HOLE THEREIN, PROVIDING AN ELONGATED METALLIC INSERT HAVING A TRANSVERSE CROSS SECTION AT A BASE PORTION DEFINING AT LEAST LONGITUDINAL AXIS OF THE INSET, THE DISTANCE FROM THE LONGITUDINAL AXIS OF THE INSERT TO EACH CORNER BEING BETWEEN ONE-HALF AND THREE THOUSANDS OF AN INCH GREATER THAN THE RADIUS OF THE HOLE IN THE ARTICLE; AND, FORCING THE INSERT LONGITUDINALLY INTO THE HOLE WHILE THE ARTICLE IS STILL HOT FROM THE MOLDING STEP TO POSITION THE BASE PORTION OF THE INSERT IN THE HOLE SO THAT THE REMAINDER OF THE INSERT PROJECTS THEREFROM, THE SHARP CORNERS OF THE INSERT SCORING THE SIDES OF THE HOLE AS THE INSERT IS FORCED IN TO PROVIDE AN INTERFERENCE FIT BETWEEN THE INSERT AND THE ARTICLE, THE THERMOSETTING RESIN SHRINKING ONTO THE INSERT UPON COOLING TO SECURE THE INSERT TIGHTLY IN THE HOLE AGAINST BOTH TORSIONAL AND LONGITUDINAL FORCES APPLIED TO THE INSERT.