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US 6,644,904 B2Granted
Wood screw with square threads
OwnerShu-Li Chen, Shiu-Mei Cheninventors
Life of this patent
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Abstract
A wood screw to be used exclusively for fastening a wooden plate mainly has a screw shank helically disposed with squared threads, wherein a shaft flange is disposed at the bottom end of the screw shank to be parallel or slanted to the longitudinal axis of the screw shank between the upper and the bottom rims of the third and fourth threads. The shaft flange is in a convex trapezoid shape and is positioned vertically along the shank to make a pointed or planar cut so as to reduce friction for a smoother driving, an easier and labor-saving operation.
Claims4
A wood screw comprising:
- a) a screw shank having a screw head at a first end, helical threads with square edged threads extending along a main body of the shank, and a second end;
- and,
- b) two pairs of shaft flanges, a first pair of shaft flanges extending on the main body of the shank above and below a second thread from the second end of the screw shank, a second pair of shaft flanges extending on the main body of the shank above and below a fourth thread from the second end of the screw shank, each shaft flange having a length less than a distance between adjacent threads.
Dependencies are inferred from the claim text.