Improved wood screw structure

Abstract

This invention provides an improved wood screw structure, which mainly includes: a screw head having a top and a neck that tapers away from the top; a shank portion forming a first shank segment, a second shank segment, and a tapered segment sequentially from the neck, the tapered segment tapering from the adjacent first shank segment to a stationary point; a first thread helically protruding on the first shank segment; an enlarged thread helically protruding from the adjacent first thread end towards the stationary point; a first chip removal groove recessed from the stationary point towards the enlarged thread; and a second chip removal groove formed on the enlarged thread of the shank portion and having a plurality of chip removal openings; wherein, each chip removal opening is formed at the intersection of the second chip removal groove and the enlarged thread, so that this improved wood screw structure facilitates chip removal and prevents wood cracking when locking the workpiece.

Claims

1. An improved wood screw 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 first shank segment, a second shank segment, and a conical segment, one end of the second shank segment being adjacent to the neck and the other end being adjacent to the first shank segment, the conical segment tapering from the first shank segment towards a stationary point, and the first shank segment being disposed between the conical segment and the second shank segment; a first thread helically protruding from the first shank segment; and a reaming thread having one end adjacent to the first thread and helically protruding from the first shank segment towards the stationary point of the conical segment, the reaming thread having a plurality of serrated teeth. A first chip removal groove is recessed from the fixed point toward the enlarged thread; and a second chip removal groove is formed in the enlarged thread of the rod body, and extends from the end adjacent to the first chip removal groove toward the first thread on the outer periphery of the rod body, and the second chip removal groove has a plurality of chip removal openings; wherein, Each of the chip removal ports is formed at the intersection of the second chip removal groove and the enlarged thread.

2. The improved wood screw structure as described in claim 1, further wherein the helical direction of the first chip removal groove and the axial projection of the rod portion onto the surface of the rod portion form a rotation angle.

3. The wood screw improvement structure as described in claim 1, further comprising the first thread and the enlarged thread being integrally formed.

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

5. The improved wood screw structure as described in claim 4, further comprising a buffer portion provided between the second thread and the neck of the shank.

6. The wood screw improvement structure as described in claim 4, further wherein when viewed along the axial direction of the shank body, the adjacent chip discharge ports of the enlarged thread partially overlap.

7. The wood screw improvement structure as described in claim 4, further comprising: the first rod segment having a first rod bottom diameter; the second rod segment having a second rod bottom diameter at the location where the second thread is provided; the diameter of the first rod bottom diameter being smaller than the diameter of the second rod bottom diameter but greater than zero.

8. The improved wood screw structure as described in claim 1, further comprising a first chip removal groove including a first cut-off surface and an adjacent second cut-off surface.

9. The improved wood screw structure as described in claim 8, further comprising the first cut-off face having a first cut-off area, the second cut-off face having a second cut-off area, wherein the first cut-off area and the second cut-off area are different.

10. The wood screw improvement structure as described in claim 9, further wherein the first cut-off area is larger than the second cut-off area.

Images