System for fixing accessories on frames made of metal material for doors, windows, and the like
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United States of America Patent
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Mar 25, 2014
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N/A
app pub date -
Jan 12, 2012
filing date -
Jan 12, 2011
priority date (Note) -
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Abstract
A system for fixing an accessory on a metal frame for doors, windows, and the like, includes a screw having a head and a self-tapping threaded stem with metric thread, the end of which opposite to the head is tapered. A ratio between the external diameter of the self-tapping stem of the screw and the diameter of the through hole of the wall of the frame is approximately between 1.4 and 1.25, and the ratio between the diameter of the through hole of said wall and its thickness is approximately between 2.5 and 5.5 and more preferably between 3 and 5.
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