Claims
- 1. A screw with barbed threads, comprising:
a shank having a head end and a point end; a plurality of barbed thread sections formed on the outer periphery of said shank, each barbed thread section having a leading edge and a trailing edge, the trailing edge forming an acute angle with a line tangent to said shank where the trailing edge meets said shank; the leading edge gradually tapering to meet the shank generally tangentially; and a head formed on the head end of said shank.
- 2. The screw with barbed threads according to claim 1, wherein said acute angle is between about 60° and about 70°.
- 3. The screw with barbed threads according to claim 2, wherein said acute angle is about 60°.
- 4. The screw with barbed threads according to claim 1, wherein said trailing edge is bent to one side of said barbed thread section.
- 5. A nail with a barbed point, comprising:
a shank having a head end, a point end, and a longitudinal axis; a barbed point formed on said point end, the barbed point having a point and at least one barb, each of the at least one barbs having a leading edge and a trailing edge, the leading edge extending from the point outward from said longitudinal axis and toward the head end, the trailing edge extending from the rear of the trailing edge to said shank, the trailing edge forming an acute angle with said longitudinal axis; and a head formed on the head end of said shank.
- 6. The nail with a barbed point according to claim 5, wherein said at least one barb consists of two barbs.
- 7. The nail with a barbed point according to claim 5, wherein said acute angle is between about 60° and about 70°.
- 8. The nail with a barbed point according to claim 7, wherein said acute angle is about 60°.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/477,479, filed Jun. 11, 2003.
Provisional Applications (1)
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Number |
Date |
Country |
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60477479 |
Jun 2003 |
US |