Thread forms for preventing disengagement between male and female screwheads
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United States of America Patent
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Mar 2, 1999
Grant Date -
N/A
app pub date -
Oct 7, 1996
filing date -
Oct 9, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
The present invention provides a male screwthread that does not loosen. In a male screwthread that has a thread ridge formed on an outer peripheral surface of an axial portion and a head portion that forms a tool mating means at one end of this axial portion, loosening and return between the male screwthread and a female screwthread is prevented (self-locking) by a configuration in which the thread ridge thereof is formed to have a major diameter that is larger than a reference value and the half-angle of the head-portion side of the thread ridge is formed to be less than 30 degrees.
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