Thread-forming screw with separate thread sprial and different part flank angles

US10823219B2 · kind B2 · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Christoph Hakenholt · Feldkirch, AT
• Bernhard Winkler · Birkenfeld, DE
• Roland Schneider · Schotten, DE
• Robert Spring · Buchs, CH
• Huu-Toan Antoine Nguyen · Milano, IT

Key dates

• Filing date: Oct 4, 2016
• Grant date: Nov 3, 2020
• Expiry date: Jul 16, 2037

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B37/12
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A thread-forming screw has a shank which, in a front region of the shank, has a tip for insertion into a bore in a substrate, and in a rear region of the shank, has a drive for transmitting a torque to the shank. The shank has a spiral-shaped groove and a thread spiral which is inserted into the spiral-shaped groove. The spiral-shaped groove has a front flank and a rear flank disposed opposite the front flank. The front flank, at least regionally, has a different part flank angle than the rear flank.