Self-cutting undercutting dowel

US5921733A · kind A · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Werner Kaibach · Buchloe, DE
• Hanspeter Schad · Grabs, CH
• Stefan Raber · Kaufering, DE
• Thomas Doppelbauer · Feldkirch, AT

Key dates

• Filing date: Dec 16, 1997
• Grant date: Jul 13, 1999
• Expiry date: Dec 16, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B13/122
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A self-cutting, undercutting dowel (1) is formed of an axially extending anchor rod (2) with a head part (3) leading in a setting direction (S) of the dowel and an axially extending sleeve (5) laterally enclosing the anchor rod (2). At its end facing in the setting direction, the sleeve (5) has expansion sections (7) separated from one another by axially extending slots (6). The sleeve (5) can be driven over the head part (3) relative to the anchor rod (2) so that the expansion sections (7) flare radially outwardly. At least one of the expansion sections (7) has a tooth shape at its end facing in the setting direction forming a cutting edge (10) for cutting an undercut in a receiving material for the dowel. The cutting action is effected by rotating the sleeve (5). The cutting edge (10) is located at a side edge (11) of the expansion section (7) leading in the rotating direction (R) of the sleeve (5) and the cutting edge is inclined to an axis (A) of the sleeve at a first angle (.alpha.). The expansion section (7) with the cutting edge (10) has a trailing side edge (12) inclined relative to the axis (A) of the sleeve (5) at a second angle (.beta.). The sum of the two angles (.alpha…