Expansion dowel assembly with a spherically shaped spreader

US4607992A · kind A · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Bernd Mauritz · Munich, DE
• Raimer Uhlig · Munich, DE

Key dates

• Filing date: Sep 28, 1984
• Grant date: Aug 26, 1986
• Expiry date: Sep 28, 2004

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B5/025
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

An expansion dowel assembly includes an axially elongated expansion sleeve with an axially extending expansion region, a spreader positioned within the sleeves in the expansion region, and a bolt in threaded engagement within a tapped bore in the spreader so that the spreader can be displaced axially through the expansion region for widening it in the radial direction. The surface of the spreader in surface contact with the interior of the sleeve is spherically shaped. In the assembled state, before expansion, the spreader is held in the expansion sleeve against axial displacement. Accordingly, the parts of the assembly can be preassembled as a unit.