Ammunition and explosives – Projectiles – Composite
Patent
1994-01-18
1995-02-28
Tudor, Harold J.
Ammunition and explosives
Projectiles
Composite
F42B 1406
Patent
active
053927141
DESCRIPTION:
BRIEF SUMMARY
The invention relates to sub-calibre projectiles comprising a core projectile, whose rear end is engaged by pusher means, and a discarding cage, the pusher means consisting of a pressure plate with a rearwards-projecting alignment spike and of a pressure piece into which is inserted the alignment spike. Such projectiles can attain very high initial velocities and consequently a wide service range. This, however, makes target accuracy all the more important and special measures are required to safeguard against the pusher means or the cage discarded after leaving the barrel adversely affecting the projectile.
Such a projectile is known from DE-C 704 406. It consists of a pusher means with a rear extension protruding into parts acted on by gas pressure. A shell case is pressed into a lateral circumferential slot of the pusher means, the shell case being torn apart after leaving the barrel by the centrifugal force acting on expansion rings which are fitted inside the shell case. By this, tearing apart of the shell is neither predictable nor symmetric. Adverse effects on the projectile, which is even self-stabilizing, can thus be expected.
From the DE-C 27 18 557 a pusher means is known, which consists of a block attacked by the gas forces, in front of which is disposed a centered bearing plate holding the projectile as well as the segments of the cage. The latter are designed so as to separate after leaving the barrel by centrifugal force due to rifling of the barrel. They could also be torn apart by aerodynamic forces acting on conical surfaces on the front end of the segments.
This has the disadvantage that block and bearing plate are too short and are only centered with regard to lateral disalignment --which is impossible inside the barrel at any rate--so that these parts tend to tilt under the action of the pressurized gaz and this tilting movement is communicated to the projectile. It is an other disadvantage that the segments of the cage are held together together with the projectile. By this, separation of the segments also affects the projectile adversely with respect to target accuracy. A further disadvantage is the expensive construction of the pusher means and particularly of the segments. Furthermore, in case of a wing-stabilized projectile, there would be a risk of injuring the wings.
It is therefore the object of the invention to propose a cheap and simple projectile of the above kind, which is able to attain highest initial velocity and target accuracy. To this end, according to the invention, the cage consists of individual segments, and the bases of the segments are secured between pressure plate and pressure piece and are linked to the segments at the level of the pressure plate by webs which constitute breaking points.
The segmentation safeguards simultaneous disintegration of the cage. Holding the bases between pressure piece and pressure plate safeguards that the projectile is not adversely affected by the discarding segments. By holding the bases between pressure piece and pressure plate, the segments need not even be united with each other. The breaking points between the segments and their bases safeguard that the segments tilt away simultaneously, do not affect the projectile and do not damage the stabilizing-wings. Altogether this results in easiliy manufactured and assembled parts and low production cost.
It is advantageous if the alignment spike presents grooves with a barbed cross-section. These provide a firm connection between pressure plate and pressure. Piece, the spike being pressed into the latter so as to provide a fast hold for the bases of the segments of the cage.
In one embodiment of the invention, the pressure piece is made of a plastic material and the bases of the cage are provided with collars inserted into a cylindrical slot of the pressure piece. This embodiment is particularly cheap and the pressure piece with a pusher cavity assures good sealing. The cylindric collar provides for good fastening of the bases in spite of the weakness of the plastic material and fo
REFERENCES:
patent: 2306140 (1940-09-01), Reed
patent: 4408538 (1983-11-01), Deffayet et al.
patent: 4476785 (1984-10-01), Hoffman et al.
patent: 4590862 (1986-05-01), Grabarek et al.
patent: 4709638 (1987-12-01), Broden et al.
patent: 5052305 (1991-10-01), Chiarelli et al.
Steyr-Daimler-Puch AG
Tudor Harold J.
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