Countersunk head screw
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United States of America Patent
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Jul 31, 2012
Grant Date -
May 14, 2009
app pub date -
Nov 17, 2008
filing date -
May 19, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a countersunk head screw comprising a cylindrical shaft (2) and an essentially conical countersunk head (4) comprising at least two edges (15) on the lower side. Said countersunk head screw is characterized in that the edges each mark an end of a partial surface (10) located on the lower side, each of the partial surfaces lying on a non-concave separate surface of revolution.
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