EP0096186B1 - Cartridge case - Google Patents

Description

The invention relates to a one-piece steel sleeve for cartridges made from a blank by extrusion, comprising a sleeve base, a sleeve body which consists of one piece with the sleeve base and forms a sleeve wall, a shoulder cone which forms a uniformly thick wall and with the sleeve body consists of one piece.

The invention further relates to a device for producing a cartridge case - consisting of a case base, a case body, a shoulder cone and a case neck, the wall thickness of the case body continuously decreasing from the case base against the shoulder cone and the wall of the shoulder cone being thicker than the wall of the case body at its thinnest point - in the extrusion process with an extrusion mandrel.

In a known cartridge case according to the preamble of claim 1 (see CH-A-503 966), the wall thickness of the shoulder cone is equal to or less than the wall thickness of the sleeve body. When the cartridge is fed to a weapon with such a cartridge case, the stress on the shoulder cone is greatest, as a result of which it is compressed to an undesirable extent.

In another known cartridge case according to the preamble of claim 2 (see US-A-3 485 170) consisting of a case bottom, a case body, a shoulder cone and a case neck, the wall of the shoulder cone is thicker than the wall of the case body on it thinnest point. However, this known cartridge case is made of plastic and not steel and can therefore not be used for all weapons.

In another known cartridge case (see GB-A-2762 A.D. 1911) the wall thickness of the case body from the case bottom against the shoulder cone is constantly decreasing. Here too, as stated above, when the cartridge is supplied with such a cartridge case to a firearm, the shoulder can be undesirably compressed.

The object which is to be achieved with the present invention is to create a cartridge case which, when the cartridge is fed to the weapon, is able to withstand the forces which arise without undesirable compression of the shoulder cone.

The cartridge case according to the invention, with which this object is achieved, is characterized in that the wall thickness of the case wall of the case body steadily decreases from a first value S1 on the case bottom to a value S2 at a middle point, and then steadily increases again from this second value S2 at this middle point to a third value S3 on the shoulder cone, this middle point being closer to the shoulder cone than to the base of the sleeve, that the shoulder wall of the shoulder cone has a greater wall thickness than the sleeve body at the middle point mentioned and that a sleeve neck in front of the Shoulder cone with this consists of one piece, the wall thickness of which is smaller than the wall thickness of the shoulder cone.

• Fig. 1 einen Längsschnitt durch eine fertige Patronenhülse
• Fig. 2 einen Längsschnitt durch eine Patronenhülse in einem Zwischenstadium der Fertigung mit einem Extrudierdorn.

An embodiment of the cartridge case according to the invention and the device for producing this case is described in detail below with reference to the accompanying drawing. It shows:

• Fig. 1 shows a longitudinal section through a finished cartridge case
• Fig. 2 shows a longitudinal section through a cartridge case in an intermediate stage of production with an extrusion mandrel.

• a) einem Hülsenboden 11, der eine Bohrung 12 zum Einsetzen einer nicht dargestellten Zündkapsel besitzt,
• b) einem Hülsenkörper 13, der vorzugsweise leicht konisch ausgebildet ist, z.B. 2,5% d.h. 0° 42' 58"
• c) einem Schulterkonus 14, der stärker konisch ausgebildet ist, z.B. 18° 30' und
• d) einem Hülsenhals 15, der vorzugsweise zylindrisch ausgebildet ist.

1, the cartridge case consists of

• a) a sleeve base 11 which has a bore 12 for inserting a primer, not shown,
• b) a sleeve body 13, which is preferably slightly conical, for example 2.5%, ie 0 ° 42 '58 "
• c) a shoulder cone 14 which is more conical, for example 18 ° 30 'and
• d) a sleeve neck 15, which is preferably cylindrical.

The wall of the sleeve body 13 becomes steadily thinner from the sleeve bottom 11 against the shoulder cone 14 up to the point S2 and then steadily thicker up to the point S3. The wall of the shoulder cone 14 either becomes steadily thinner from the sleeve body 13 against the sleeve neck 15 or has the same thickness everywhere.

According to the invention, the wall of the shoulder cone 14 is thicker than the wall of the sleeve body 13 at point S2. 1, the wall thickness of the sleeve body 13 steadily decreases from the value S1 to the value S2 and then increases again steadily to the value S3. The wall of the shoulder cone 14 has the same wall thickness everywhere with the value S3. The sleeve neck 15 has the same wall thickness everywhere with the value S4.

The reinforcement of the wall of the shoulder cone 14 is necessary since this area of the cartridge case 10 is subjected to greater stress when the cartridge is fed to the weapon, in particular due to the acceleration or deceleration forces.

2, an extrusion mandrel 16 is used to produce the cartridge case 10 according to the invention, which has a recess or circumferential groove 17 on its periphery in the region of the shoulder cone 14, such that a thickening 18 forms in the sleeve wall when the cartridge case 10 is extruded. When the extrusion mandrel 16 is withdrawn in the direction of arrow A from the cartridge case 10, this thickening 18 is pressed radially outwards, as indicated in FIG. 2 with a broken line. This cut-out 17 on the extrusion mandrel 16 makes it more difficult to strip the cartridge case 10 from the extrusion mandrel 16 without requiring a special stripping device. In this way, the necessary wall thickening 18 is achieved in the desired area and in the desired extent.

When the sleeve neck is drawn in or shaped, ie when the sleeve is finally shaped, the wall is thickened by the desired amount at the desired location and the shoulder cone 14 is thus reinforced. With this thickening of the shoulder cone 14 by the desired amount, the immersion conditions of the sleeve when it is fed into the cartridge chamber are influenced and adapted to the requirements.

Claims (2)

1. An extruded steel cartridge case integrally formed from a one-piece blank, comprising.

- a case base (11);

- a case body (13) integrally former _'._'ith the case base (11) forming the wall of the case;

- a conical shoulder (14) having the same wall thickness throughout integrally with the case body;

characterised in that

- the wall thickness of said case body continuously decreasing from a first value (S1) at the case base (11) to a second value (S2) at an intermediate location and then continuously increasing from this second value (S2) at this intermediate location to a third value (S3) at the conical shoulder (14);

- said predetermined intermediate location being closer to said conical shoulder (14) than said case base (11);

- said wall of said conical shoulder (14) having a greater wall thickness than said wall thickness of said case body (13) at said predetermined intermediate location thereof;

- a case neck (15) following to the conical shoulder (14) integrally formed with it having a wall which is thinner than said wall of said conical shoulder (14).

2. An apparatus for extruding a cartridge case containing a case base (11), a case body (13), a conical shoulder (14) and a case neck (15); said wall thickness of said case body (13) continuously decreasing from said case base (11) towards said conical shoulder (14), said wall of said conical shoulder (14) having a wall thickness greater than said wall thickness of said case body (13) at a thinnest location thereof, an extruding mandrel (16) and said extruding mandrel (16) containing a recess (17) arranged at the region of said conical shoulder (14) in order to produce a region of increased wall thickness in the wall of said cartridge case.

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