Rivet screw drill
A rivet screw drill for fastening at least two panels, the rivet screw drill includes a head portion mounted to a fastening tool, a fastening portion integrally formed with the head portion and of which a screw thread is formed thereto and a perforating portion integrally formed with the fastening portion and pressurizing and penetrating the panels by rotation according to operation of the fastening tool, wherein a mounting protrusion, connected to the fastening tool, is protruded from the head portion and a plurality of support ends are formed to the mounting protrusion.
1. A rivet screw drill for fastening at least two panels, the rivet screw drill comprising:
a head portion mounted to a fastening tool;
a fastening portion integrally formed with the head portion and of which a screw thread is formed thereto; and
a perforating portion integrally formed with the fastening portion and pressurizing and penetrating the panels by rotation according to operation of the fastening tool, wherein
a mounting protrusion, connected to the fastening tool, is protruded from the head portion and a plurality of support ends are formed to the mounting protrusion, and a concave space is formed between the support ends,
the perforating portion becomes sharp toward an end thereof,
the fastening portion and the perforating portion have a cross section shaped as Reuleaux triangle, and
the perforating portion has a perforating edge groove which comprises a first surface and a second surface that are formed from the end of the perforating portion,
the first surface being a curved surface formed from the end of the perforating portion toward the fastening portion and the second surface being a flat surface connecting the first surface with an outer surface of the perforating portion.
2. The rivet screw drill of claim 1 , wherein the support ends are formed as a pair and radially disposed.
3. The rivet screw drill of claim 2 , wherein six support ends are formed as a sunflower shape.
4. The rivet screw drill of claim 1 , wherein three support ends are formed and radially disposed.
5. The rivet screw drill of claim 4 , wherein the support ends are shaped as a triangular circle.
6. The rivet screw drill of claim 1 , wherein the fastening portion comprises:
a main screw thread shaped as a triangle formed from the head portion to a part of the fastening portion; and
a sub-screw thread round shaped from the main screw thread to the other portion of the perforating portion.
7. The rivet screw drill of claim 1 , wherein:
the perforating portion becomes sharp toward an end thereof; and
a round contact edge contacting the panel is formed to the end of the perforating portion.
8. The rivet screw drill of claim 7 , wherein an edge groove is formed to an end of the perforating portion.
9. The rivet screw drill of claim 8 , wherein the edge groove is formed as a cone.
10. The rivet screw drill of claim 7 , wherein the fastening portion comprises:
a main screw thread shaped as a triangle formed from the head portion to a part of the fastening portion; and
a sub-screw thread round shaped from the main screw thread to the other portion of the perforating portion.
11. The rivet screw drill of claim 7 , wherein:
the fastening portion and perforating portion have a cross section shaped as a Reuleaux triangle.
12. The rivet screw drill of claim 1 , wherein:
the perforating portion becomes sharp toward an end thereof; and
a line contact edge is formed to the end of the perforating portion contacting the panel.
13. The rivet screw drill of claim 12 , wherein a cutting surface is formed to the perforating portion.
14. The rivet screw drill of claim 1 , wherein the fastening portion comprises:
a main screw thread shaped as a triangle formed from the head portion to a part of the fastening portion; and
a sub-screw thread round shaped from the main screw thread to the other portion of the perforating portion.
15. The rivet screw drill of claim 1 , wherein:
the fastening portion and perforating portion have a cross section shaped as a Reuleaux triangle.
16. The rivet screw drill of claim 1 , wherein:
a rim is protruded from the head portion.