Screw
First Claim
1. Screw, which comprises a self-tapping screw, with a screw head, a screw shaft having a longitudinal screw axis, a screw tip, a screw thread, as well as a cutting thread formed at a cutting thread pitch angle disposed in an opposite direction from a screw thread pitch angle of the screw thread relative to the screw axis, the cutting thread including a cutting edge which starts at a distance from a front end of the screw and only covers a tip portion of the screw;
- andin which the cutting thread includes a plurality of transverse portions extending between turns of the screw thread, the transverse portions of the cutting thread being spaced apart and spaced around at least one complete turn of the screw shaft, said transverse portions being interrupted at most by one turn of the screw thread.
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Accused Products
Abstract
The invention concerns a screw, in particular a self-tapping screw, with a screw thread which reaches to the front end of the screw formed as a drilling tip. In the front area, starting with a distance from the front end of the screw, there is an opposite thread showing the same pitch as the screw thread, however, its thread height is lower than the thread height of the screw thread. This second, opposite single-thread, double-thread or triple-thread/multi-thread only reaches over the tapered drilling tip and leaves the shank of the screw free. It forms a cutting edge with its thread edge which is used to cut fibers in order to reduce wedge effect during screwing in the screw. The screw is particularly suitable for wood or wood-like materials in the edge areas of structural elements.
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Citations
9 Claims
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1. Screw, which comprises a self-tapping screw, with a screw head, a screw shaft having a longitudinal screw axis, a screw tip, a screw thread, as well as a cutting thread formed at a cutting thread pitch angle disposed in an opposite direction from a screw thread pitch angle of the screw thread relative to the screw axis, the cutting thread including a cutting edge which starts at a distance from a front end of the screw and only covers a tip portion of the screw;
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in which the cutting thread includes a plurality of transverse portions extending between turns of the screw thread, the transverse portions of the cutting thread being spaced apart and spaced around at least one complete turn of the screw shaft, said transverse portions being interrupted at most by one turn of the screw thread. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification