CA1204961A

CA1204961A - Practice ammunition

Info

Publication number: CA1204961A
Application number: CA000409597A
Authority: CA
Inventors: Lars Ringdal
Original assignee: Individual
Current assignee: Individual
Priority date: 1981-08-18
Filing date: 1982-08-17
Publication date: 1986-05-27
Also published as: NO812786L; FR2511765A1; NO148725B; GB2106222A; DE3229885A1; NO148725C; GB2106222B; FR2511765B3

Abstract

Abstract The invention relates to practice ammunition of plastic, wherein the assembly of the cartridge casing and the projectile portion has been reinforced by inserting a metallic body having a bore for receiving a tracking light charge. The metallic body is provided with gripping teeth on the external surface, said teeth being directed towards the centre of the metal insert, which is positioned with approximately one half in the projectile and one half in the forward extension of the casing.

Description

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Improvements in practice ammunition The present invention is related to improve-ments in practice ammunition comprisin~ a casing and a 6 projectile made of plastic, wherein the front end of th.e casing is closed by a tearable wall having a cylindrical hollow extension for the attachment of a projectile.
Norwegian patent 113 440 is describing such a closing of the front end of a casing and the ~ttachment of a projectile has been carried out with. external threads on t~le extension of the casing and corresponding internal threads respectively in a cavity of the projectile. However, experience has shown that this kind of attachment is causing problems and parLicularly by small caliber ammunition.
The present invention is related to a completely novel attachment system for the projectile to the ~mmlln; tion casing, wherein the drawbacks by previously known attachment systems are avoided. In order to solve this problem an attachment means has been used which is combining several substantial functions. Thus, the invention is characterized in th.at a metallic body having gripping means on the exter-nal surface of both enas and directed to the centre of the body has been inserted with approximately one half into a cavity .in.the extension of the ~mmllnition casing and with the other half into one part of an offset cauity in a projectile portion ID) which has been pushed down over-the extension. The used metallic body also is offering.the advantage of providing a projectile which is heavier and thus has direction stability over a longer distance. It is furthermore by the use of the metallic`body given an oppor-tunity to provide a cavity in this for insertion of a trac~ing:light charge as well as to carry out partial bores or shortened bores in order to have exactly the same weight of the projectiles with and withou.t the tracking light charge-It is known by shooting with plastic projectiles with a metal cup for tracking light charge mounted inside, that same will .increase the weight of the projectile and ~(J~6~

it is commonly known by training shooting to use amm~nition mounted in belts or bands or casettes and every fifth r'ound then is ordinarily provided with tracking light char~e. The difference in weight then has had the effect that the rounds 5 with tracking ligh`t charge having a heavier projectile will get another trajectory than the projectiles without tracking light charge and the hits in .he target will have a very poor-assembly. This drawback'has been avoided by means of the present invention, because by this'embodiment there will be no variation of the weight of the projectile whether it contains a tracking light charge or not, bec`ause *here has not been'used drilling `or smaller drilling 'out of the metallic part when the ammunition is produced without tracking 'ligh't charge.
According to the present invention one end of the metallic'insert provided with gripping `means has been arranged in the extension of the ammunition casing.' The other end is inserted into a cavity in the projectile part when this is pushed down onto the extension. With a narrow fit the gripping means then will retain'the two parts with good attachment to each other 'during 'firing.' It is'important that the external side of the extension of the casing and the corresponding internal side of the projectile part have very -~smooth-and excellently itted 'surfaces. By the firing and tearing of the extension of the ammunition casing,'a very high gas pres'sure will be present inside the ammunition and it is important that the gases are not allowed to`penetrate between the external wall of the ex*ension and the internal wall of the projectile portion, because in'that case there is'-danger of explosion and tearing off parts of the projectile.
In another embodiment according to the invention the metallic part at one end has an approximately cylindrical expansion which may be fitted into a corresponding chamber in the exten~ion of the ammunition casing and which then will be well locked when the portions of the projectile are assembled with narrow fit. Another important detail'by the invention by the'use of certain plastic`types comprises the fact that the bottom o~ the extension of the casing may be drawn somewhat more to the front so that when the projectile has been assembled, the end surfaces will be in alignment with or inside of the rear end of the projectile. By firing of the projectile this will be receiving a speedy rotational movement by leaving the muzzle of the weapon. In order to prevent that the metallic body owing to greater weight shall receive another rotational movement compared with the - surrounding projectile part of plastic, the metallic body in accordance with the invention has been provided with grip-ping means which are in engagement with-the plastic material in such a way that plastic and metal will have the same rotational speed.
The invention is in the following 'further described with.reference to the drawings, wherein Fig'. 1 is showing the metallic body in two embodiments, fig. 2 is'.showing the projectile and the ~mmlln;tion casing assembled without the metallic body, Fig. 3 is showing 'one embodiment of.the metallic body inserted into the ammunition and Fig'. 4 is sh.owing the other embodiment of the body.
Fig. 1 is showing 'the metallic body A in two embodiments having 'a cavity B for the reception of a track.ing 'light charge (not shown) and wherein'th.e ~ody A'in the one case has been provided with:external toothing.at ~
both ends and in the other case has :a cylindrical expansion

2~ C at one end.'Fig. 2.is:showing the projectile D and the A nition casing 0 in:assembled condition, but without th.e metallic'body ~. In the projectile portion has been provided a cavity E for reception of approximately one half o~ the body and in'the extension of th.eam~nition casing has been provided a cavity G for positioning 'of the other half of the body. A channel H'is~enabling 'the fired gases in the ammunition casing to, .reach the body. Fig'.' 3 is'showing th.e body positioned with the external toothing I engaging .the internal walls of the cavities E and G. Fig'. 4 is showing ' 35 a body of th.e type.at-th.e bottom of Fig. 1 arranged in:the projectile and casins of the A~'~1n;tion with-its expanded part C in the extension of the casing.' 4 ~ 4g~

Fig. ~ is showing the end wall K of the i~
ammunition casing extension being pushed more to the front, so that .it will be positioned inside the hindmost part L
of the projectile D. In order to prevent different rotational speeds of the metallic body A and the surrounding projectile portion D, the body A has been provided with a groove~at one end of the metal part which has been pressed into the projectile. In order to obtain a larger cavity G the extension of the ammunition casing may be provided with one or more grooves N.

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Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. Practice ammunition comprising a casing and a projectile made from plastic, wherein a front end of the casing is closed by a tearable wall having a cylindri-cal hollow extension, characterized in that a metallic body provided with gripping means on the external surface of both ends and directed towards the centre of the body, has been inserted with approximately one half into a cavity in the extension of the casing and with the second half into one portion of an offset cavity in the projectile which has been pushed onto the extension.

2. Ammunition according to claim 1, characterized in that the metallic body at one end is provided with a cavity for the reception of a tracking light charge.

3. Ammunition according to claim 1 or claim 2, characterized in that the gripping means on the metallic body is extending in opposite directions and at one end consist of an approximately cylindrically expanded portion which is received in a corresponding expansion in the prolongation of the end portion of the casing.

4. Ammunition according to claim 1 or claim 2, characterized in that the extension of the ammunition casing externally has smooth surfaces having a narrow fit with the internal wall of the rear part of the offset cavity in the projectile portion.

5. Ammunition according to claim 1 or claim 2, characterized in that the tearable wall of the front end of the ammunition casing has been drawn forwardly so that the bottom of same is adapted to be aligned with or inside of the rear part of the projectile.

6. Ammunition according to claim 1 or claim 2, characterized in that the metallic body also is provided with gripping means preventing relative rotation in the plastic projectile portion.