Screw
OwnerKuo-Tai Hsuinventor
Life of this patent
Estimating the term…
Abstract
A screw includes a rod-shaped portion, and a spiral-shaped thread winding around the rod-shaped portion. The rod-shaped portion has a straight portion, and a front end portion tapering towards a pointed front end. Several cutting trenches are formed on the rod-shaped portion for cutting bits off a workpiece with which when the screw is being screwed into the same. The tapering front end portion is provided with a notch, and cutting teeth are provided on that portion of the thread corresponding to the tapering front end portion. Cut-off bits of a workpiece can be received in the trenches as well as the cutting teeth so that the same can't have excessive resistance against the screw.
Claims6
A screw, comprising
- a rod-shaped portion including a straight portion, and a front end portion tapering towards a pointed front end;
- a continuous spiral-shaped thread winding around both the straight portion and the tapering front end portion of the rod-shaped portion;
- and being characterized by a plurality of cutting trenches being formed on the rod-shaped portion for cutting bits off a workpiece with which when the screw is being screwed into the same.
Dependencies are inferred from the claim text.