Ammunition and explosives – Cartridges – Projectile structure
Patent
1986-11-05
1988-08-09
Tudor, Harold J.
Ammunition and explosives
Cartridges
Projectile structure
102334, 102430, 102470, 102513, F42B 502
Patent
active
047620684
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to cartridged ammunition for a grenade pistol, the ammunition being of the type that includes a casing having an opening, a projectile which is disposed in the opening and which includes a payload and a transfer charge (such as a tracer charge and/or a delayed-action charge) for the payload, and primer and propelling charges disposed in a cup at the base of the casing.
Cartridged ammunition for a grenade piston is disclosed in German Offenlegungs-Schrift (unexamined laid-open application) No. 3,149,430. The prior art ammunition includes a metal propelling charge container or casing (made, for example, of aluminum) with which the grenade body or the projectile is crimped together. Primer and propelling charges are disposed in a cup-shaped propelling charge cartridge which is screwed into the base of the casing. Radially extending discharge openings permit, after firing of the propelling charge, propagation of the propellant gases into the interior of the casing and charge the tail of the projectile with propellant gas pressure.
To save costs, the casing of cartridged practice ammunition is preferably made of plastic and, since crimping is then not possible, the casing must be connected with the generally metal projectile body by glue.
However, glue connections have the drawback that, in spite of careful matching and monitoring of all manufacturing parameters, even within one and the same lot, different degrees of extraction forces are observed. Additionally, the extraction force is a function of temperature and aging. Since, moreover, a considerably smaller propelling charge is employed for practice ammunition compared to combat ammunition, a particularly disadvantageous temperature dependency of the propellant gas pressure results when the propellant gases exit from the propelling charge cartridge or the propelling charge cup into the large-volume interior of the propelling charge casing. Both effects have the drawback of producing greatly deviating values for the initial velocity (V.sub.0) of the projectile, and reproducible firing results are almost impossible to attain. In connection with prior art projectiles it was additionally noted that, due to the escape of propellant gases into the interior of the casing, the tracer or delayed-action charge disposed in the tail section of the projectile is not fired with sufficient reliability.
SUMMARY OF THE INVENTION
It is an object of the invention to improve cartridged ammunition for a grenade pistol to the extent that the above-described drawbacks are avoided and, primarily because of a constant, almost temperature independent initial velocity, firing results are realized which are reproducible over a broad temperature range as well as reliable ignition of the tracer and/or delayed-action charge.
Based on cartridged ammunition of the above defined type, this is accomplished by providing the cup which accommodates the priming and propelling charges in the form of two mutually concentric sleeves, with the inner sleeve being mounted in the outer sleeve so as to be slidable and extendable in the manner of a telescope. The inner sleeve is cup-shaped and is provided, in its bottom, with a firing channel oriented toward the tracer charge and the delayed-action charge. The outer sleeve has a free end section which is provided with an external thread followed by an annular, circumferential predetermined break location. The base of the projectile includes a sleeve having an internal thread which is screwed onto the outer sleeve of the cup.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view in longitudinal section illustrating the ammunition in its rest or un-fired state;
FIG. 2 is a view in longitudinal section illustrating the ammunition a short time after firing of the propelling charge;
FIG. 3 is a view in longitudinal section illustrating the ammunition after separation of the projectile from the casing;
FIG. 4 is a view in longitudinal section illustrating a modified embodiment of the ammunition, with recess
REFERENCES:
patent: 2872864 (1959-02-01), Barnes et al.
patent: 3547030 (1970-12-01), Kamp et al.
patent: 3981241 (1976-09-01), Ambrosini et al.
patent: 4197801 (1980-04-01), Lafever et al.
Nico-Pyrotechnik Hanns-Jurgen Diederichs GmbH & Co KG
Tudor Harold J.
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