Patent · US Active

Screw

US8408855B2 · kind B2 · utility

7Cited by

21References

8Claims

0Family size

Assignees

SWG SCHRAUBENWERK GAISBACH GMBH · DE
WUERTH INTERNATIONAL AG · CH

Inventors

Günter Stiebitz · Waldenburg, DE
Uwe Wolfarth · Schrozberg, DE

Key dates

Filing date	Apr 15, 2010
Grant date	Apr 2, 2013
Priority date	—
Expiry date	Nov 5, 2030

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16B35/041
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A screw, in particular a self-tapping screw, has a screw thread which covers up to the front end of the screw formed as a drilling tip or cutting 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 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.