Wood screw chip removal structure

Abstract

This invention provides a wood screw chip removal structure, comprising a screw head having a top and a neck, the neck extending from the top and tapering away from the top; a shank integrally formed from the neck and comprising a shank segment and a tapered segment, one end of the shank segment adjacent to the neck, the other end tapering outward to form the tapered segment, the tapered segment having a stationary point; a first thread helically protruding on the shank segment; an enlarged thread helically protruding on the shank segment and having a plurality of serrated teeth, one end of which continues the first thread, the other end adjacent to the tapered segment; a first chip removal groove recessed in the shank segment along a first direction and formed in the enlarged thread, the first chip removal groove and the enlarged thread forming a chip removal opening at their intersection; and a second chip removal groove formed in the tapered segment; wherein, one end of the second chip removal groove is adjacent to one of the chip removal openings of the first chip removal groove.

Claims

1. A wood screw chip removal structure, mainly comprising: a screw head having a top and a neck, the neck extending from the top and tapering away from the top; a shank integrally formed from the neck of the screw head, the shank comprising a shank segment and a tapered segment, one end of the shank segment adjacent to the neck, and the other end tapering outward to form the tapered segment, the tapered segment having a fixed point opposite the other end of the screw head; a first thread helically protruding on the shank segment; and a reaming thread helically protruding on the shank segment and having a plurality of serrated teeth, one end of which is connected to the first thread, and the other end of which is adjacent to the tapered segment; A first chip removal groove is recessed into the reamed thread along a first direction on the rod section, and the first chip removal groove and the reamed thread form a chip removal opening at the intersection; and a second chip removal groove is formed on the tapered section from the adjacent end of the reamed thread toward the stationary point; wherein... One end of the second chip removal groove is adjacent to one of the chip removal ports of the first chip removal groove.

2. The wood screw chip removal structure as described in claim 1, further comprising the pointed cone section having a dome angle at the stationary end, the dome angle being greater than or equal to 15 degrees and less than or equal to 28 degrees.

3. The wood screw chip removal structure as described in claim 1, further comprising a plurality of locking rib units on the outer periphery of the top of the screw head.

4. The wood screw chip removal structure as described in claim 1, further comprising a second thread between the first thread and the neck.

5. The wood screw chip removal structure as described in claim 1, further comprising that the first thread and the enlarged thread are integrally formed.

6. The wood screw chip removal structure as described in claim 4, further comprising a buffer portion between the second thread and the neck of the shaft.

7. The wood screw chip removal structure as described in claim 1, further wherein the first direction of the first chip removal groove and the axial projection of the rod body onto the surface of the rod segment form an inclined angle.

8. The wood screw chip removal structure as described in claim 1, further, when viewed along the axial direction of the rod section, the adjacent chip removal ports of the enlarged thread partially overlap.

9. The wood screw chip removal structure as described in claim 4, further comprising: the protruding part of the rod segment forming the second thread having a second thread root diameter, and the protruding part of the rod segment forming the first thread having a first thread root diameter, wherein the diameter of the second thread root diameter is smaller than the diameter of the first thread root diameter but greater than zero.

10. The wood screw chip removal structure as described in claim 1, further comprising a first semi-conical unit and a second semi-conical unit, wherein the second semi-conical unit protrudes from the first semi-conical unit and forms the second chip removal groove.

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