Self-drilling screw for use with steel sheets
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United States of America Patent
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N/A
Issued Date -
Oct 12, 2006
app pub date -
Apr 6, 2006
filing date -
Apr 8, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The main body (2) of a self-drilling screw has a driven head (9) having at its top central region a weld lug (10) of a prescribed size. The screw also has a discrete drive head (3) having in its top a hole (11) for engagement with a driving tool. A thinned stud (12) continuing from the drive head (3) is resistance welded to the top center of driven head (9), using the weld lug (10) to form between these heads a torque-limiting junction (13) ready to break at a prescribed torque. As the main body (2) of the screw for use with thin steel sheets is tightened, the drive head (3) will be removed due to breakage of the junction (13). Any excessive tightening torque imparted to the screw will not break a female-threaded hole formed in the steel sheet, but firmly retaining the screw on it.
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