Self-Threading Female Fastener Elements and Method of Forming Same
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United States of America Patent
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Issued Date -
Dec 13, 2007
app pub date -
Nov 24, 2003
filing date -
Dec 5, 2002
priority date (Note) -
Abandoned
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Abstract
A female fastener having a self-threading bore for threaded receipt of a conventional male threaded fastener which forms a substantially continuous female thread without tapping having a prevailing torque. The bore includes a cylindrical internal surface and a plurality of circumferentially spaced concave recesses having a total volume equal to an annulus defined by a major diameter and an inner diameter of the cylindrical surface. A method of forming self-attaching fasteners by rolling a continuous metal strip having a central pilot, piercing spaced self-threading bores through the pilot and either severing the pilot or the strip. Where the strip is severed into discreet fasteners, the fasteners may be interconnected by a frangible connector without reorienting the fasteners.
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