Anti-loose screw and a die device for forming same
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United States of America Patent
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Sep 22, 2015
Grant Date -
Feb 19, 2015
app pub date -
Aug 16, 2013
filing date -
Aug 16, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An anti-loose screw (20) includes a shank (24) having an external thread (28) with a thread angle of 63° to 68° between two flanks (34, 36) extending between a crest (30) and a root (32). A first angle (A) between one of the flanks (34, 36) and an axis (Y) extending perpendicularly to a longitudinal axis (X) of the shank (24) and passing through the crest (30) is in a range between 34° and 40°. A second angle (B) between the other flanks (34, 36) and the axis (Y) is in a range between 25° and 29°. The anti-loose screw (20) can engage with an object (40) having an internal thread (42) with a thread angle of 60° to provide an interference fit and can be formed by two dies (120, 140) each including a thread forming configuration (128, 148) having correspondingly formed ridges (130, 150) and valleys (136, 156).
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