Wood screw with square threads
OwnerShu-Li Chen, Shiu-Mei Cheninventors
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Abstract
A screw structure 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.
Claims3
A screw structure to be used exclusively for fastening a wooden plate mainly comprises a screw shank having helical threads with squared threads, is characterized that:
- at the bottom end of the screw shank, between the third and fourth threads, one or more than one shaft flange in the form of a strip can be positioned parallel or slightly slanted to the longitudinal axis of the shank to make a pointed or planar cut to reduce turning friction.
Dependencies are inferred from the claim text.