Patent ID: 6745697
Filing Date: 2004-06-08
Classification: F42B,F42C

Abstract:
A cartridge comprising:a combustible case containing a charge and an electrothermal ignition device including a plurality of ignition channels provided in the charge, and extending axial symmetrical in the direction of a longitudinal axis of the cartridge, and with each ignition channel comprising at least a first propellant tube that is provided on at least one of an inner and an outer surface with an electrically conducting layer that extends in the direction of the longitudinal axis of cartridge, and that is connected at its opposite ends to a respective electrode for connecting each of the electrically conducting layers across a power supply; and wherein each electrically conducting layer has a structure that forms at least one series connection of a plurality of electrical decoupling resistances interconnected by high resistance bridging elements, and each of the decoupling resistances has a geometrical shape and makes a point contact, as a bridging element, with adjacent resistances in a respective series connection, whereby following the activation of a power-supply system connected across the electrodes, current flowing through the structure causes several electric arcs to form between adjacent decoupling resistances as a result of local overheating in the bridging elements.