EP0346779B1 - Projectile for practice - Google Patents

Description

The invention relates to a training projectile according to the preamble of claim 1.

In a known practice floor according to DE-A 26 39 884, a self-supporting hood made of plastic is provided. This hood withstands the forces exerted on the projectile during launch and in flight. However, due to the stability of the hood, there is a risk that the projectile will bounce off the sand floor practically undamaged at flat angles of impact and then fly over the safety area of the shooting range.

It is forbidden to design the hood or its arrangement on the projectile body so weakly that it is destroyed even in the event of a flat target impact, since it then no longer withstands the loads that occur when it is fed to the weapon barrel and when it is fired.

The object of the invention is to propose a training projectile, the hood of which on the one hand withstands the loads occurring during the feeding and the firing and on the other hand the bounce range is reduced.

According to the invention, the above object is achieved in a practice projectile in accordance with the characterizing features of claim 1.

The support member stabilizes the thin-walled hood axially and radially so that it can withstand the forces that occur during feeding and firing. On the other hand, even at flat angles of incidence and low impingement speeds, the support part deforms so that the hood breaks off. This increases the flow resistance of the parts so that the bounce range is reduced.

Another advantage of this practice floor is that a particularly thin-walled, inexpensive hood can be used, since its stability, which is low in itself, is increased by the support part.

• Figur 1 ein Übungsgeschoß im Schnitt,
• Figur 2 eine Ansicht des Stützteils entsprechend Figur 1 und
• Figur 3 eine Ansicht des Stützteils in Richtung des Pfeiles III nach Figur 2.

Advantageous refinements of the invention result from the subclaims and the following description of an exemplary embodiment. The drawing shows:

• FIG. 1 shows an average practice floor,
• Figure 2 is a view of the support member corresponding to Figure 1 and
• Figure 3 is a view of the support member in the direction of arrow III of Figure 2.

A practice projectile has a projectile body (1) made of steel, which is provided with a guide band (2). The projectile body (1) is provided with steps (3) on the front side and, viewed in isolation, has a high air resistance. The projectile body (1) is provided with an axial bore (4).

On the projectile body (1) is a comparative screwed thin-walled ogiven-shaped hood (5), which consists for example of aluminum. The projectile body (1) forms together with the hood (5) a projectile whose ballistic values correspond to those of sharp projectiles. There is a free space (6) between the hood (5) and the front of the projectile body (1). A support part (7) is arranged in this. The support part (7) is made of plastic, such as polyethylene, polyurethane or polyamide.

The support part (7) has a pin (8) which is inserted into the bore (4). The support part (7) is provided with four webs (9) which are arranged in a star shape (see FIG. 3). Only three webs (9) or more than four webs (9) can also be provided.

The webs (9) have outer edges (10), on the course of which the inner shape of the hood (5) is adapted. The webs (9) rest with rear edges (11) in the vicinity of the pin (8) on the front of the projectile body (1).

The functionality of the described device is approximately as follows:
The support part (7) is held radially by the pin (8) on the projectile body (1). It is supported axially on the rear edges (11) of its webs (9). The outer edges (10) support the hood (5) both radially and axially.

When the projectile is fed to the weapon barrel and when it is launched, as well as in flight, the supporting part (7) takes on axial and radial forces acting on the hood (5). The support part (7) also dampens vibrations of the hood (5).

In the event of an impact, in particular also in the case of a flat target impact, the webs (9) are deformed on account of the elasticity of the plastic and their shape, so that the hood (5) breaks off from the projectile body (1). The then effective air resistance of the projectile body (1) is so high that the projectile body (1) flies only a comparatively small distance.

To further increase the air resistance of the projectile body (1), surface parts can be arranged in the area of its steps or on the support part (7), which open or open when the hood (5) is broken off.

Claims (4)

1. A training projectile with a thin-walled ogival cap (5) made of plastics material, which is superimposed onto a projectile body (1), the projectile body (1) has inside the ballistic cap (5) steps (3) and an axial bore (4) into which is inserted a pin (8) of a supplementary body (7), in which respect the supplementary body (7) lies in a free space (6) between the projectile body (1) and the cap (5), characterised in that the supplementary body is a supporting part (7) made of plastics material having arms (9) arranged in a star-shaped manner, the outer edges (10) of which butt against the cap (5) and the front side of the projectile body (1) is designed in such a way that its air resistance is high in comparison with the projectile.
2. A training projectile according to claim 1, characterised in that the supporting part (7) butts with tail-sided edges (11) of the arms (9) in the vicinity of the pin (8) against the projectile body (1).
3. A training projectile according to claim 1, characterised in that provided on the projectile body (1) or on the supporting part (7) are surface parts which after the breaking-off of the cap (5) increase the air resistance.
4. A training projectile according to claim 1, characterised in that the outer edges (10) of the arms (9) butt over their entire length against the cap (5) and support this axially and radially.

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