Self-drilling screw

US6142719A · kind A · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Gerd Daubinger · Munich, DE
• Horst Rahmsmdorf · Munich, DE
• Felix Ferlemann · Windach, DE
• Sven Jochmann · Dresden, DE
• Daniel E. Spielberg · Aachen, DE

Key dates

• Filing date: Mar 30, 1999
• Grant date: Nov 7, 2000
• Expiry date: Mar 30, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B25/103
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A self-drilling screw including a drilling section (1; 4) adjoining a thread section (2; 5) of the screw and formed of first (11; 41) and second (12; 42) parts arranged one after another, within the drilling section (1; 4) having first and second cutting edges (15, 16; 45, 46) a radial extension of which is symmetrical with respect to the longitudinal axis of the screw, in the first, in a drilling direction, part of the drilling section (1; 4), with at least a portion of the second part (12, 42) of the drilling section (1, 4), which is located between the first part (11, 41) and the thread section (2; 5), having in a region of one of the first cutting edges (15; 45), a radial extension (R1; R3) corresponding, at most, to a half of a root diameter (D1; D3) of the thread section (2; 5), and with the second cutting edge (16, 46) having in the second part (12, 42) of the drilling section (1, 4), a radial extension (R2; R4) which is smaller than a half of a pitch diameter (D2; D4) of the thread section (2, 5) and corresponds at least to the half of the root diameter (D1; D3) of the thread section (2; 5).