Inductive igniters with secondary coil

US4651254A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Uwe Brede · Ergolding, DE
• Heinz Kern · Königstein, DE
• Gerhard Kordel · Wendelstein, DE

Key dates

• Filing date: Apr 5, 1985
• Grant date: Mar 17, 1987
• Expiry date: Apr 5, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S336/02
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A secondary coil is provided for use in inductive igniters for the igniting of propellant charge powder. In these igniters, two coil systems cooperate with each other in accordance with the transformer system, wherein the secondary coil is to be as small as possible and is to form a compact unit with the igniter. This is accomplished by arranging the windings of the secondary coil in the form of flat sandwich coils on a support material in an insulated fashion so that upon folding of the support material, the individual flat coils are placed in mutual opposition so that they form a cylinder coil. Furthermore, these flat coils are connected with each other by way of their outermost and innermost windings, the transition from the outermost windings being located at the crease and the innermost windings being joined together so that the flat coils are disposed almost in congruence on the front side as well as on the rear side, and the transition of the innermost coils being effected by a metallized path extending through the carrier material.