Electric detonator

US4644863A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Richard Bender · Achern, DE
• Hellmut Bendler · Birkenfeld, DE
• Horst Penner · Fürth, DE
• Reinhold Sander · Cadolzburg, DE

Key dates

• Filing date: Nov 9, 1984
• Grant date: Feb 24, 1987
• Expiry date: Nov 9, 2004

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F42C19/12
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An electric detonator has a casing and a pole piece electrically insulated with respect to the casing by means of an insulating cup, as well as with an ignition resistor electrically conductively connected to the casing and to the pole piece. In order to avoid undesirable charges on the insulating cup, which could be the cause of misfirings, the insulating cup is associated with an electrically conductive coating in contact with the casing and with the pole piece.