System having a screw
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United States of America Patent
Stats
-
Jan 6, 2009
Grant Date -
Jun 28, 2007
app pub date -
Dec 4, 2006
filing date -
Dec 28, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system having a screw structure includes a casing and a self-tapping screw. The casing includes a through hole. The self-tapping screw includes a male thread portion and an unthreaded column portion arranged relative to each other in a longitudinal direction of the self-tapping screw, and is threadably coupled to the casing through the through hole. The through hole includes a large diameter hole portion and a small diameter hole portion. The large diameter hole portion is engaged with the male thread portion. The small diameter hole portion is engaged with the unthreaded column portion. The large diameter hole portion has a longitudinal length shorter than a longitudinal length of the unthreaded column portion.
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