CASE JACKET

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°.

Claims

1. A case jacket made of felted, in particular combustible fibrous material, cast 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 clyindrical 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 exc 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. 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 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.

9. The case jacket according to claim 8, wherein the angle of inclination of the wall is 7 degrees or less.

10. The case jacket according to claim 8, wherein the angle of inclination of the wall is 3 degrees or less.

11. The case jacket according to claim 8, 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.

12. The case jacket according to claim 8, 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.

13. The case jacket according to claim 12, 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.

14. The case jacket according to claim 8, wherein a textile fabric is embedded in the wall of the cylindrical case jacket portion.

Description

[0013] The invention will subsequently be explained in greater detail by way of example with reference to the drawings, in which:

[0014] FIGS. 1 and 2 each show a longitudinal section through a first and a second embodiment of a case jacket according to the invention.

[0015] The exemplary embodiments of inventive case jackets 1 shown in the Figures include a case jacket portion 2 and a case bottom 3 as well as a conical connecting portion 4 between the same. All three of them are made of a felted, combustible fibrous material which is formed for example from nitrocellulose and pulp. In the wall 5 of the case jacket 1 a textile fabric (not shown here) can be embedded.

[0016] The case jacket portion 2 is a cylinder which has a constant wall thickness 6 in circumferential direction and in longitudinal direction with a first inside diameter 7 and a first outside diameter 8; its cylinder axis is designated with reference numeral 9. To a first end 10—in the Figures the lower end—of the case jacket portion 2 the conical connecting portion 4 is connected. To the other (second) end 11—in the Figures the upper end—further parts of the ammunition will be connected, and for this purpose a chamfer 12 is formed.

[0017] The conical connecting portion 4 is arranged coaxially with respect to the case jacket portion 2 and has a constant wall thickness 13 in circumferential direction and in longitudinal direction, which is identical with that of the case jacket portion 2. The one end 14 of the connecting portion 4 is connected to the first end 10 of the case jacket portion 2 and has the first inside diameter 7 and the first outside diameter 8. The other end 15 of the connecting portion 4 is connected to the case bottom 3 and has a second inside diameter 16 which is smaller than the first inside diameter 7, and a second outside diameter 17 which is smaller than the first outside diameter 8.

[0018] The angles of inclination 18, 19 of the inner wall 20 and the outer wall 21 of the conical connecting portion 4 with respect to the cylinder axis 9 are the same due to the constant wall thickness 13 and amount to 3° in the case of FIGS. 1 and 7° in the case of FIG. 2.

[0019] The case bottom 3 is arranged coaxially to the case jacket portion 2 and to the conical connecting portion 4 and has a constant wall thickness 22 in circumferential direction and in longitudinal direction, which is identical with the wall thickness 6 of the case jacket portion 2 and with the wall thickness 13 of the conical connecting portion 4. The case bottom 3 is formed from a calotte-shaped case bottom portion 23 and a cylindrical case bottom portion 24.

[0020] In the calotte-shaped case bottom portion 23 an opening 25 coaxial to the cylinder axis 9 is formed, which receives the igniter (not shown). The annular edge 26 of the calotte-shaped case bottom portion 23 faces the conical connecting portion 4 and has the second inside diameter 16 and the second outside diameter 17.

[0021] This edge 26 is adjoined by the cylindrical case bottom portion 24 with an end 27. The case bottom portion 24 likewise has the second inside diameter 16 and the second outside diameter 17. Its other end 28 faces the conical connecting portion 4 and is connected to the same and thus forms an annular connecting edge 29 of the case bottom 3 towards the conical connecting portion 4.