Case jacket

Patent metadata

Field	Value
Publication number	US-11898833-B2
Application number	US-202117797614-A
Country	US
Kind code	B2
Filing date	Feb 10, 2021
Priority date	Feb 19, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A case jacket made of a felted, in particular combustible fibrous material, comprising a cylindrical case jacket portion and a calotte-shaped case bottom which is connected to an end of the cylindrical case jacket portion, wherein the bottom-side end of the case jacket portion has a first inside diameter and a first outside diameter, and wherein the case bottom has an annular connecting edge towards the case jacket portion, which has a second inside diameter that is smaller than the first inside diameter, and a second outside diameter which is smaller than the second outside diameter, includes a conical connecting portion whose one end has the first inside diameter and the first outside diameter and is connected to the bottom-side end of the case jacket portion, and whose other end has the second inside diameter and the second outside diameter and is connected to the connecting edge of the case bottom, wherein the angle of inclination of the inner wall and the angle of inclination of the outer wall of the conical connecting portion with respect to the cylinder axis are not more than 10°.

First claim

The invention claimed is:

1. A case jacket made of felted, in particular combustible fibrous material, the case jacket comprising:
a cylindrical case jacket portion;
a calotte-shaped case bottom that is connected to one end of the cylindrical case jacket portion,
wherein a bottom-side end of the cylindrical case jacket portion has a first inside diameter and a first outside diameter, and
wherein the calotte-shaped case bottom has an annular connecting edge towards the cylindrical case jacket portion, which has a second inside diameter that is smaller than the first inside diameter and a second outside diameter that is smaller than the first outside diameter; and

a conical connecting portion having an inner wall and an outer wall, wherein one end of the conical connecting portion has the first inside diameter and the first outside diameter and is connected to the bottom-side end of the cylindrical case jacket portion, and whose other end has the second inside diameter and the second outside diameter and is connected to the connecting edge of the calotte-shaped case bottom,
wherein an angle of inclination of the inner wall and an angle of inclination of the outer wall of the conical connecting portion with respect to a cylinder axis are not more than 10 degrees.

2. The case jacket according to claim 1 , wherein the angle of inclination of the inner wall and the angle of inclination of the outer wall are not more than 7 degrees.

3. The case jacket according to claim 1 , wherein the calotte-shaped case bottom has a cylindrical case bottom portion on its side facing the cylindrical case jacket portion, and the annular connecting edge of the calotte-shaped case bottom forms the end of the cylindrical case bottom portion facing the cylindrical case jacket portion.

4. The case jacket according to claim 1 , wherein a wall thickness at the bottom-side end of the cylindrical case jacket portion is equal to a wall thickness of the connecting ring of the calotte-shaped case bottom.

5. The case jacket according to claim 4 , wherein, except for a chamfer at the end of the cylindrical case jacket portion facing away from the bottom, the case jacket has a constant wall thickness both in circumferential direction and in longitudinal direction.

6. The case jacket according to claim 1 , wherein a textile fabric is embedded in a wall of the cylindrical case jacket portion.

7. The case jacket according to claim 1 , wherein the angle of inclination of the inner wall and the angle of inclination of the outer wall are not more than 3 degrees.

8. The case jacket according to claim 1 , wherein the calotte-shaped case bottom is configured to be assembled with a bottom such that, when assembled, the calotte-shaped case bottom resides within a cavity defined by the bottom and the conical connecting portion resides outside of the cavity.

9. A case jacket comprising:
a cylindrical case jacket portion, wherein a bottom-side end of the cylindrical case jacket portion defines a first inside diameter and a first outside diameter;
a calotte-shaped case bottom portion, wherein an annular connecting edge of the calotte-shaped case bottom portion defines a second inside diameter that is smaller than the first inside diameter and a second outside diameter that is smaller than the first outside diameter; and
a conical connecting portion that joins the cylindrical case jacket portion with the calotte-shaped case bottom portion,
wherein a first end of the conical connecting portion is connected to the bottom-side end,
wherein a second end of the conical connecting portion is connected to the annular connecting edge,
wherein an angle of inclination of a wall between the first end and the second end is 10 degrees or less relative to a cylinder axis of the conical connecting portion.

10. The case jacket according to claim 9 , wherein the angle of inclination of the wall is 7 degrees or less.

11. The case jacket according to claim 9 , wherein the angle of inclination of the wall is 3 degrees or less.

12. The case jacket according to claim 9 , wherein the calotte-shaped case bottom portion has a cylindrical case bottom portion on its side facing the cylindrical case jacket portion, and the annular connecting edge of the calotte-shaped case bottom portion forms the end of the cylindrical case bottom portion facing the cylindrical case jacket portion.

13. The case jacket according to claim 9 , wherein a wall thickness at the bottom-side end of the cylindrical case jacket portion is equal to a wall thickness of the connecting ring of the calotte-shaped case bottom portion.

14. The case jacket according to claim 13 , wherein, in that except for a chamfer at the end of the cylindrical case jacket portion facing away from the bottom, the case jacket has a constant wall thickness both in circumferential direction and in longitudinal direction.

15. The case jacket according to claim 9 , wherein a textile fabric is embedded in the wall of the cylindrical case jacket portion.

16. The case jacket according to claim 9 , wherein the calotte-shaped case bottom is configured to be assembled with a bottom such that, when assembled, the calotte-shaped case bottom resides within a cavity defined by the bottom and the conical connecting portion resides outside of the cavity.

17. An ammunition assembly comprising:
a bottom defining a cavity; and
a case jacket having a cylindrical case jacket portion, a calotte-shaped case bottom portion, and a conical connecting portion that joins the cylindrical case jacket portion with the calotte-shaped case bottom portion,
wherein the case jacket is configured to couple with the bottom via the calotte-shaped case bottom portion such that the calotte-shaped case bottom resides within the cavity and the conical connecting portion resides outside of the cavity,
wherein a bottom-side end of the cylindrical case jacket portion defines a first inside diameter and a first outside diameter,
wherein an annular connecting edge of the calotte-shaped case bottom portion defines a second inside diameter that is smaller than the first inside diameter and a second outside diameter that is smaller than the first outside diameter,
wherein a first end of the conical connecting portion is connected to the bottom-side end and a second end of the conical connecting portion is connected to the annular connecting edge, and
wherein an angle of inclination of a wall between the first end and the second end is 10 degrees or less relative to a cylinder axis of the conical connecting portion.

18. The ammunition assembly according to claim 17 , wherein the angle of inclination of the wall is 7 degrees or less.

19. The ammunition assembly according to claim 17 , wherein the angle of inclination of the wall is 3 degrees or less.

20. The ammunition assembly according to claim 17 , wherein the calotte-shaped case bottom portion has a cylindrical case bottom portion on its side facing the cylindrical case jacket portion, and the annular connecting edge of the calotte-shaped case bottom portion forms the end of the cylindrical case bottom portion facing the cylindrical case jacket portion.

Assignees

• Nitrochemie Gmbh
• Rheinmetall Waffe Munition Gmbh

Inventors

• Oltmanns Jens
• Focken Ulrich
• Brachmann Dirk
• Thiesen Stephan
• Vagedes Michael
• Schnackenberg Luca Linus

Classifications

• F42B5/181 Primary

  consisting of a combustible casing wall and a metal base; Connectors therefor · CPC title

• F42B5/192 Primary

  Cartridge cases characterised by the material {of the casing wall (cartridge bags F42B5/38)} · CPC title

• F42B5/188

  Manufacturing processes therefor · CPC title