Self-tapping screw

US6340277B1 · kind B1 · utility

Assignee

• EJOT VERBINDUNGSTECHNIK GMBH & CO. KG · DE

Inventors

• Gottfried Koenig · Bad Laasphe, DE
• Werner Menz · Tambach-Dietharz, DE

Key dates

• Filing date: Aug 11, 2000
• Grant date: Jan 22, 2002
• Expiry date: Aug 11, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B25/0047
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

Self-tapping screw having an at least partially non-round enveloping curve for the thread and having a penetrating section and a retaining section, it being the case that the penetrating section contains a plurality of successive thread stages which each have at least one thread turn and, along the thread stage, have essentially the same, aligned enveloping curve which runs either cylindrically or elliptically, the thread stages with an elliptical enveloping curve (elliptical thread stage) being combined such that the major axes of the successive elliptical thread stages, forming a stage group, are offset with respect to one another.