Wood screw
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United States of America Patent
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-
Jun 28, 2016
Grant Date -
Jul 2, 2015
app pub date -
Mar 6, 2015
filing date -
Dec 26, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A wood screw includes a plurality of cutting areas radially disposed on a conical bottom surface of a head and a smooth area formed between the cutting areas. Each cutting area has at least two grooves, each of which has a base different from each smooth area and two rib walls protruding from the base. The rib walls of two adjacent grooves meet to form a first cutting edge. Each cutting area further has two outer walls protruding from the smooth area. Each outer wall meets one rib wall of the adjacent groove on a second cutting edge. The cutting edges cut and scrape off burrs attached to a drilled hole. The cutting edges cooperate with the grooves to permit a continuous cutting action simultaneously with an increasing accommodation area for scraped burrs and prevent the burrs from sticking out from the head. Thus, the fastening effect is promoted.
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