Self-drilling screw

US8192124B2 · kind B2 · utility

Assignee

• ADOLF WÜRTH GMBH & CO. KG · DE

Inventors

• Frank Wolpert · Eschental, DE
• Juergen Wanner · Waldenburg, DE
• Andreas Wunderlich · Wenzenbach, DE

Key dates

• Filing date: May 25, 2007
• Grant date: Jun 5, 2012
• Expiry date: Sep 28, 2028

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B25/0084
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

Disclosed is a screw for hard wood, comprising a screw tip (3) with two cutting edges (5) that extend approximately parallel to each other and perpendicular to the longitudinal axis of the screw. The cutting angle of the cutting edges amounts to about 90°. A centering tip (7) which slightly protrudes from the two cutting edges (5) is embodied in the extension of the longitudinal axis of the screw. Said centering tip (7) prevents the screw from deviating to the side at the beginning of the drilling process.