METHOD AND APPARATUS FOR MANUFACTURING A DUAL-THREADED BOLT
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Oct 18, 2012
filing date -
Oct 21, 2011
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Abandoned
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Abstract
Embodiments of the present invention comprise methods and apparatuses for manufacturing dual-threaded bolts. The invention comprises utilize rolling dies having one die with coarse thread projections over a surface of the die and fine thread projections over another surface of the die. In some embodiments, the surfaces on which the coarse thread projections and the fine thread projections are located are distinct from one another, or in other embodiments a portion of the surfaces may overlap or be formed integrally within the other projections. In some embodiments a portion of, or all of, the coarse thread projections may be located on a first die section piece while a portion of, or all of, the fine thread projections may be located on separate second die section piece (e.g., an insert) that is operatively coupled to the first die section piece.
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