Device for igniting a propellant charge, a cartridge for the charge and a magazine for holding cartridges, especially for stud setting or driving tools

US5471903A · kind A · utility

Assignees

• Dynamit Nobel GmbH · DE
• Hilti Aktiengesellschaft · LI

Inventors

• Uwe Brede · Ergolding, DE
• Alfred Horr · Zirndorf, DE
• Hans Jena · Fürth, DE
• Bodo Preis · Nürnberg, DE
• Wolfgang Spranger · Fürth, DE

Key dates

• Filing date: Jul 18, 1994
• Grant date: Dec 5, 1995
• Expiry date: Jul 18, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S102/702
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A device for igniting a propellant charge is provided with a housing defining a cavity wherein a piston is displaceably guided. The cavity is connected via a bore acting as a nozzle to a chamber wherein a case member of a cartridge is arranged for accommodating the propellant charge. A bottom wall of the case member is equipped with a bore aligned with the bore acting as a nozzle. A primer wafer is disposed on the inner surface of the bottom wall, this wafer being thinner in its central zone than in its marginal zone. The central zone of the primer wafer is a region under mechanical thermal stress during compression, the ignition energy being introduced to the primer wafer via this region in the form of hot compressed air from the compression chamber.