Self-tapping screw
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United States of America Patent
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-
Sep 19, 1989
Grant Date -
N/A
app pub date -
Apr 29, 1992
filing date -
May 29, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A shape of the head part of the screw is improved and performance of insertion of the screw when punched and performance of fastening of the screw when seated as well as a finishing treatment upon completion of the fastening against a fastened member are improved. The head part is comprised of an upper large diameter part formed with a first seat surface of inverse truncated cone shape having an outer circumference of a curved concave surface and a small diameter part formed with a second seat surface of an inverse truncated cone shape concentrically and integrally connected to a lower part of the large diameter part and having its outer circumference of a curved concave surface, and an annular projecting edge is formed at a connection part between the seated surfaces of the two-stage curved concave surfaces. An outer circumference of the small diameter part is provided with a plurality of spot facing projections extending in a longitudinal direction along the curved concave surface of the second seat surface.
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