Propellant igniting system and method of making the same
AssigneeRheinmetall Industrie GmbH
InventorsHelmut Ortmann, Gunter Frye, Rainer Bohm, Manfred Lubben
Life of this patent
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Abstract
An igniting system for a projectile propellant includes a combustible support tube having an outer surface and an inner surface; a plurality of throughgoing apertures provided in the support tube; a free igniting channel coaxially surrounded by the support tube; and an ignition transfer charge formed of a pyrotechnical hard foam layer having a thickness between 1 and 3 mm and being carried on the outer surface of the support tube. The hard foam layer is composed of a large-pore inner layer and two opposite surface layers which are of densely closed structure and between which the inner layer is sandwiched.
Claims26
An igniting system for a projectile propellant, comprising
- (a) a combustible support tube having an outer surface and an inner surface;
- (b) a plurality of throughgoing apertures provided in said support tube;
- (c) a free igniting channel coaxially surrounded by said support tube;
- and
- (d) an ignition transfer charge formed of a pyrotechnical hard foam layer having a thickness between 1 and 3 mm and being carried on said outer surface of said support tube;
- said hard foam layer including a large-pore inner layer sandwiched between surface layers of densely closed structure.
An igniting system for a projectile propellant, comprising
- (a) a combustible support tube having an outer surface and an inner surface;
- (b) a plurality of throughgoing apertures provided in said support tube;
- (c) a free igniting channel coaxially surrounded by said support tube;
- and
- (d) an ignition transfer charge formed of a pyrotechnical hard foam layer having a thickness between 1 and 3 mm and being carried on said outer surface of said support tube;
- said hard foam layer including a large-pore inner layer sandwiched between surface layers of densely closed structure;
- said pyrotechnical hard foam layer being a mixture of nitrocellulose and black powder;
- said mixture containing fibers selected from the group consisting of cellulose fibers and synthetic fibers.
A method of making an igniting system for a propellant charge including a combustible, apertured support tube coaxially surrounding a free igniting channel, comprising the steps of
- (a) obtaining a solution by dissolving nitrocellulose in a nitrocellulose solvent;
- (b) adding fibers to the solution and homogeneously distributing the fibers therein;
- said fibers being nonsoluble in the solvent and being selected from the group consisting of cellulose fibers and synthetic fibers;
- (c) adding black powder to the solution and distributing said black powder therein;
- (d) applying the material obtained in steps (a), (b) and (c) externally to a tubular body;
- said tubular body being selected from the group consisting of said apertured support tube and a sleeve separate from said apertured support tube;
- and
- (e) drying the material at a presettable temperature and a presettable vacuum for evaporating the solvent to obtain on the tubular body a hard foam layer formed by a large-pore, porous layer sandwiched between two coherent, densely closed surface layers.
Dependencies are inferred from the claim text.