GB2148462A

GB2148462A - Projectile with rotating band

Info

Publication number: GB2148462A
Application number: GB08423830A
Authority: GB
Inventors: Dietrich Hoffman; Udo Gotz
Original assignee: Mauser Werke Oberndorf GmbH
Current assignee: Mauser Werke Oberndorf GmbH
Priority date: 1983-09-21
Filing date: 1984-09-20
Publication date: 1985-05-30
Also published as: NL8402606A; IT8423189V0; IT8422710A1; GB2148462B; CH669452A5; GB8423830D0; SE8404165D0; SE8404165L; IT8422710A0; DE3334023A1; SE459125B; IT1176713B

Abstract

A projectile body 8 for rapid fire weapons and high power machine guns has a synthetic rotating band 13 whose base 14 is wider than its projecting top surface, the band being disposed in a jacket for the projectile or in the cup 9 of a cartridge case base. <IMAGE>

Description

SPECIFICATION Projectile body with synthetic rotating band The invention relates to a projectile body, in particular for use in automatic rapid-fire weapons and high power machine guns, with a synthetic rotating band and an annular groove provided in the tail region of the projectile jacket for receiving the synthetic rotating band.

German Offenlegungsschrift 31 42 636 discloses a projectile body with a rotating band made from synthetic material, which in the tail region comprises an annular groove provided with intermediate webs for receiving and anchoring the synthetic rotating band. By means of the intermediate webs which are bent at an angle, which may be provided at their free ends with knurling, good anchorage of the synthetic rotating band on the projectile body is ensured. in this case, apart from possible recesses, the width of the synthetic rotating band corresponds to the width of the annular groove in the projectile body. Due to this, basically the possibilities of attachment of the rotating band to the projectile body are limited.

In a projectile body of the aforementioned type, it is the object of the invention to extend the possibilities of attachment of the synthetic rotating band to a projectile body to improve the range of application of synthetic rotating bands particularly with regard to thermal stress.

This object is achieved according to the invention due to the fact that the base of the synthetic rotating band inserted in the annular groove of the projectile body is wider than the top surface projecting radially from the annular groove. In this case, the width of the base of the synthetic rotating band may be approximately twice or three times that of the projecting top surface. In a particular embodiment of the idea of the invention, the top surface may be a relatively very narrow ring in the case of a base width increased by a multiple of this top surface width.

The basic idea of the invention is the widening of the rotating band base of synthetic rotating bands. In this case it has proved advantageous that consequently the function of a synthetic rotating band is improved essentially above all with respect to high thermal loads. This is a critical advantage especially in high power machine guns with a very high firing rate. A further essential advantage of the synthetic rotating bands according to the invention is the improvement of their range of application. Cartridge chamber dimensions can be provided so that only very narrow rotating bands can be produced. Without the widening of their base, the stability of the synthetic rotating bands on the projectile could only be solved with difficulty and with great technical expenditure.

In a further embodiment of the invention, the base of the synthetic rotating band can be anchored on a synthetic sleeve of a cartridgecase base applied to the projectile body on the rear side. This signifies an advantageous reduction of weight in the case of cartridgecase base ammunition, because due to this the metal cartridge-case base wall can be replaced by a light synthetic material. The base of the synthetic rotating band can be anchored by intermediate webs provided in the annular groove or by radial through holes provided in the annular groove.

One example of the invention is illustrated in the drawings in which: Figure 1 shows a projectile body with a synthetic rotating band according to the invention in section, Figure 2 shows a projectile body with a cartridge-case base wall of synthetic material in section and Figure 3 shows a temperature/time diagram with comparison curves of the conventional projectile body and of the projectile body according to the invention.

An annular groove 3 of relatively great width is located in the tail region of the projectile body 1 in its projectile jacket 2.

Inserted in the annular groove 3 is a synthetic rotating band 4 with a base 5 corresponding to the width of the annular groove. The top surface 6 of the synthetic rotating band 4 projecting radially from the annular groove 3 is substantially narrower than the base 5. In the example, the base is approximately more than twice the width of the top surface 6. The tail portion of the projectile body 1 is closed off by a projectile closing member 7.

In Fig. 2, a cartridge-case base wall in the form of a metal cup 9 for example made from aluminium is fitted onto the tail region of a projectile body 8. The cup 9 comprises radially projecting, bent webs 10, which lie in the form of an annulus on the outer surface of the cup 9. The base 11 of the cup 9 forms an abutment shoulder 1 2 for the synthetic rotating band 13 fitted. In this case, also, the synthetic rotating band 1 3 is provided with a substantial wider base 1 4 with respect to the top surface 15.

The diagram of Fig. 3 shows the two curves 16, 1 7 of the projectile body according to the invention and of the conventional projectile body with a synthetic rotating band in comparison to the temperature/time axis. The lower curve 1 6 corresponds to the normal anchorage 1 8 of the lower half of the projectile 19, whereas the curve 1 7 shows the anchorage 20 according to the invention of the upper half of the projectile 21. As can be seen and as was proved in tests the projectile bodies with an enlarged base of the synthetic rotating band still operate at substantially higher temperatures than is the case with conventionai projectile bodies with a synthetic rotating band. The curves clearly show the respective thermal stress in the unit of time.

Claims

1. Projectile body, in particular for use in automatic rapid fire weapons and high power machine guns, with a synthetic rotating band and an annular groove provided in the tail region of the projectile jacket for receiving the synthetic rotating band, wherein the base of the synthetic rotating band inserted in the annular groove in the projectile body is wider than the top surface projecting radially from the annular groove.

2. Projectile body according to claim 1, wherein the width of the base of the synthetic rotating band is approximately two to three times greater than the projecting top surface.

3. Projectile body according to claim 1, wherein the top surface of the synthetic rotating band is a relatively narrow ring in the case of a base width enlarged by several times this top surface width.

4. Projectile body according to any one of claims 1 to 3, wherein the base of the synthetic rotating band is anchored on a metal cup of a cartridge-case base fitted to the projectile body on the rear side.

5. Projectile body according to any one of claims 1 to 4, wherein the base of the synthetic rotating band is anchored by intermediate webs provided in the annular groove, which intermediate webs are bent at an angle with respect to the base of the annular groove.

6. Projectile body according to any one of claims 1 to 5, wherein the base of the synthetic rotating band is anchored by radial through holes provided in the annular groove.

7. A projectile body substantially as herein described with reference to the accompanying drawings.