Screw
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Apr 24, 2008
app pub date -
Oct 24, 2006
filing date -
Oct 24, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a screw with the distal end forming a cone-shaped portion, and a first and a second thread segment defined on the shank and the cone-shaped tip portion. Moreover, the first thread segment forms a thread peak and the second thread segment forms a plane surface; besides, said plane surface converges toward the thread peak of the first thread segment. Therefore, at the beginning of screwing, said plane surface of the second thread segment drills into the object to enlarge the channel. Since the channel is enlarged, the second thread segment can enter the object with less friction and higher screwing speed. Besides, the cutting debris can be removed from the space between the enlarged channel and the first thread segment to avoid cracking in the object and to maintain a better effect on fastening.
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