SCREW
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United States of America Patent
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N/A
Issued Date -
N/A
app pub date -
Aug 4, 2008
filing date -
Mar 16, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention pertains to a screw including a head, a shank having a first clockwise-threaded section and a counterclockwise-threaded section, and a drilling portion with a bottom end. Particularly, the counterclockwise-threaded section spiraling downward from the head connects to the first clockwise-threaded section by concurrently engaging their respective thread ends together. Therefore, the present invention applies the convergence of the two thread ends to efficiently guide the debris cutting by the first clockwise-threaded section and the counter force of the counterclockwise-threaded section to squeeze the debris back and share it among the threaded sections during the gradual travel of the shank through the articles, thereby reducing the drilling resistance and saving the labor imparting to the screw. Furthermore, the clockwise and the counterclockwise sections also counterbalance to steadily keep the screw buried in the articles without loosening.
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