Ammunition and explosives – Projectiles – Composite
Patent
1989-06-02
1991-12-03
Tudor, Harold J.
Ammunition and explosives
Projectiles
Composite
102511, 102516, F42B 1206, F42B 1404
Patent
active
050691392
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a projectile intended to be fired by a fire-arm.
The invention refers particularly to a projectile consisting of a hard core surrounded by a continuous jacket of ductile material adapted to cooperate with the rifling in the fire-arm.
The prior art embraced various projectiles of this type.
French Patent No. 2 540 239 describes a projectile in which a space is provided between the jacket and the core in order to reduce friction between the projectile and the barrel. Such an arrangement is interesting but does have a number of drawbacks.
The projectile which penetrates a soft body is required to retain its initial shape ; on the other hand, if it encounters a hard body, for example an armoured plate, it ought to jettison its jacket in order to pass through the said body. With this type of projectile, the connection between the jacket and the core has been found to be rather poor, with a consequent tendency for the jacket to be stripped off even when the projectile is penetrating a body which is not very hard. Furthermore, when the projectile is set in motion, there is a certain risk of slip to occur between the core and the jacket which adversely affects the range and accuracy of the projectile.
A similar arrangement is described in French Patent No. 1 240 110 and consequently this suffers from the same faults.
It has likewise been envisaged to produce a projectile in which the core is extended by a frustoconical tail engaged with force into a ductile sleeve. One of the disadvantages of this technique is that upon impact against a hard surface, the jacket spreads out and so forms a collar which arrests penetration of the projectile.
It is in particular an object of the present invention to provide a projectile which remedies these various drawbacks in order to produce ammunition which is referred to as "ordinary, tracer, piercing, incendiary piercing, tracer incendiary piercing, incendiary, explosive and reduced shot ammunition".
It is likewise an object of the present invention to create a projectile in which in particular a striker body is rigid with the core, at least throughout the trajectory of the projectile, so ensuring excellent sealing-tightness between the projectile and the barrel, as well as on the inside of the core of the projectile and between it and the jacket, which makes it possible if necessary to increase the piercing effect of the projectile.
To this end, the invention relates to a projectile of the above type which is characterised by anchoring means between the outer surface of the tail and the corresponding inner surface of the jacket.
According to another characteristic feature of the invention, the head of the core is connected to the tail by a shoulder and, opposite the tail, the jacket comprises a rear portion which is of greater thickness than the remainder of the casing, this rear portion having on the outside undulations which form circular grooves substantially at right-angles to the longitudinal axis of the projectile and a free space being disposed between the shoulder and the corresponding part of the jacket.
The invention provides a projectile which offers numerous advantages:
a) the jacket and the core form one unitary body so that they are propelled at one and the same speed of rotation, the accuracy and performance also being enhanced;
b) upon impact against a soft surface, the jacket remains intact;
c) upon impact, on a hard surface, the core can be stripped bare after a slight delay so avoiding the formation of a bead around the core;
d) friction inside the barrel is reduced to the minimum necessary;
e) the hammer-hardened material of the casing which is worked while the projectile is passing through the barrel finds its place, so avoiding the risks of the said jacket tearing;
f) by reason of the thickness of the rear portion of the jacket, the risks of this becoming separated from the core are avoided, so further increasing accuracy.
In particular, according to an advantageous characteristic feature, the projectile comprises an axial housing
REFERENCES:
patent: 681448 (1901-08-01), Gathmann
patent: 2322751 (1943-06-01), Studler
patent: 2336143 (1943-12-01), Werme
patent: 2792618 (1957-05-01), Walker
patent: 3302570 (1967-02-01), Marquardt
patent: 3795196 (1974-03-01), Hillenbrand
patent: 4708063 (1987-11-01), Ladriere
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