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A cartridge with a propellant case (4) that contains a propellant charge (3) and an electrothermal ignition device, wherein several ignition channels (9) are provided in the charge (3), and extend axial-symmetrical in the direction of longitudinal axis (8) of cartridge (1), with each channel compris

A cartridge with a propellant case (4) that contains a propellant charge (3) and an electrothermal ignition device, wherein several ignition channels (9) are provided in the charge (3), and extend axial-symmetrical in the direction of longitudinal axis (8) of cartridge (1), with each channel comprising a propellant tube (10) and an electrically conducting layer (11). To achieve a uniform and symmetrical ignition of the cartridge (1) in the chamber of the respective weapon, electric arcs (21) that form during the ignition operation in the ignition channels (9), are decoupled in that the electrically conducting layer (11) is composed of successively connected rhombi or other shapes (circles, ovals, etc.) that electrically function as decoupling resistances. When current flows through such a structure, the current bridges (20) arranged in the current-flow direction between the individual rhombi (15) etc. initially break apart explosively. Electric arcs (21) then are formed at these locations and are decoupled by the decoupling resistances (15). Continued current flow causes more and more of the decoupling elements (15) to erode, so that the electric arcs (21) become longer and longer.

대표청구항 ▼

1. 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 witheach ignition channel compri

1. 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 witheach 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 eachelectrically 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.2. A cartridge according to claim 1, wherein the decoupling resistances are formed by at least one of rhombus-shaped, rectangular, circular and oval regions of the electrically conducting layer.3. A cartridge according to claim 1, wherein the electrically conducting layer consists of aluminum or copper.4. A cartridge according to claim 1, wherein a plastic foil is arranged on at least one of the inner and outer surfaces of the first propellant tube, and the electrically conducting layer is vapor deposited onto the plastic foil.5. A cartridge according to claim 1, wherein each ignition channel includes at least three series connections of decoupling resistances that are connected in parallel.6. A cartridge according to claim 1, wherein at least three axial symmetrical ignition channels are arranged in the charge.7. A cartridge according to claim 5, wherein the length of the ignition channels is 50 to 400 mm.8. A cartridge according to claim 7, wherein the length of the ignition channels is 200 to 300 mm.9. A cartridge according to claim 1, wherein at least one said electrically conducting layer that extends in the direction of the longitudinal axis is arranged on the inside surface of the first propellant tube, and this one layer is directly followed on the inside by a second propellant tube or powder rod.10. A cartridge according to claim 2, wherein the rhombus-shaped, rectangular, circular or oval regions of the electrically conducting layer have at least one of respectively differing thicknesses and shapes.