Washer, screw or nut with increased coefficient of friction
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United States of America Patent
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Jul 28, 2015
Grant Date -
Jun 30, 2011
app pub date -
Aug 24, 2009
filing date -
Aug 26, 2008
priority date (Note) -
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Abstract
The invention relates to a washer (10), screw or nut having an end surface (12) which faces toward a workpiece, wherein the end surface (12) is provided with a concentric, annularly encircling web (14), and that region (18) of the end surface (12) which is situated outside the encircling web (14) tapers conically toward the web (14) from the outside, with the inclination from the outside to the inside being directed away from the workpiece.
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