Screw with low drilling resistance
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United States of America Patent
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Oct 21, 2014
Grant Date -
Nov 17, 2011
app pub date -
May 13, 2010
filing date -
May 13, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A screw with low drilling resistance comprises a head portion, a shank portion, a plurality of first threads, a drilling portion, and a plurality of second threads. Wherein, a plurality of opening slots are correspondingly defined on the second threads, and a first included angle of the first threads is smaller than a second included angle of the second threads. Thereby, the opening slots on the second threads efficiently provide the first threads with an auxiliary cutting effect and preferably offers a debris accommodating room. The first threads including the smaller first included angle favorably reinforce the bearing force of the second threads including the larger second included angle, thereby promoting the cutting effect of the screw and allowing a speedy screwing.
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