NECKLESS CARTRIDGE

• US 20160091288A1
• Filed: 05/13/2014
• Published: 03/31/2016
• Est. Priority Date: 05/15/2013
• Status: Active Grant

• Current Assignee: Etat Francais Represente Par Le Delegue General Pour L'Armement
• Original Assignee: Etat Francais Represente Par Le Delegue General Pour L'Armement
• Inventors: DANIAU, Emeric
• Granted Patent: US 9,587,919 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F42B 5/025 characterised by the dimension of the case or the missile
• CPC Class Codes: F42B 5/067 Mounting or locking missiles in cartridge cases F42B5/18 takes precedence
• CPC Class Codes: F42B 5/30 of plastics , i.e. the cartridge-case tube is of plastics

Abstract

A cartridge with a composite cartridge case includes a projectile with an ogee-shaped tip and a bottom end ending in a base, a flangeless tubular case delimiting a chamber accommodating a propulsive powder, closed at a first longitudinal end by a base with a primer and at the second end opposite to the first, by the base of the projectile, a part of the flangeless tubular case fitting snugly around part of the projectile and having itself, at least in part, a frustoconical external shape, the cartridge being characterized in that: the chamber accommodating the propulsive powder includes, at the projectile end, a reduction in its diameter over all or part of the periphery thereof down to the diameter of the base of the projectile, the ratio between the length of the tip of the projectile and the maximum diameter thereof is greater than or equal to 2.9.

Claims

1-10. -10. (canceled)

11. A cartridge comprising, on the one hand, a projectile with an ogival-shaped nose and a base ending with a head and, on the other hand, a polymer neckless tubular case defining a propellant powder receiving chamber closed, on the one hand, at a first longitudinal end by a head with a primer and, on the other hand, at the second longitudinal end, opposite to the first longitudinal end, by the head of the projectile, with a portion of the neckless tubular case enclosing a portion of the projectile and the portion of the neckless tubular case enclosing a portion of the projectile having, at least in part, a frustoconical external shape, wherein:

the propellant powder receiving chamber has, on the projectile side, a reduction of the diameter of the propellant powder receiving chamber over at least part of the periphery of the propellant powder receiving chamber up to the diameter of the head of the projectile,

the ratio between the length of the nose of the projectile and the maximum diameter of the projectile is greater than or equal to 2.9.

12. The cartridge according to claim 11, wherein the ratio between the length of the nose of the projectile and the diameter of the projectile is between 2.9 and 4.1.

13. The cartridge according to claim 11, wherein the reduction of the diameter of the combustion chamber up to the diameter of the head of the projectile corresponds to a gradual reduction of the internal diameter of the case, the case having, at this level, a frustoconical shape with a half-angle between 20 and 40 degrees.

14. The cartridge according to claim 11, wherein the projectile has a mainly cylindrical base and the case has, at the second longitudinal end of the case and in the head-projectile direction, a first portion having a gradual reduction of the internal diameter of the first portion over at least part of the perimeter of the first portion, a second portion of a constant thickness, the inner face of the second portion being, at least partially, and preferably completely in contact with the projectile and then a terminal portion constituted by a shoulder, the inner face of the shoulder being in contact with the projectile.

15. The cartridge according to claim 14, wherein the first portion has a gradual reduction of the internal diameter of the first portion up to the head of the projectile and having a frustoconical shape and the length of the second portion is at least equal to a third of the length of the terminal portion.

16. The cartridge according to claim 11, wherein the projectile has a base having, at least in part, a gradual reduction of the diameter of the base up to the head of the base.

17. The cartridge according to claim 16, wherein the case has, at the second longitudinal end of the case and in the head-projectile direction, a first portion having, over at least part of the perimeter of the first portion, a gradual reduction of the internal diameter of the first portion up to the head of the projectile, a second portion of an external diameter equal to the diameter of the first portion and of an increasing internal diameter conforming to a portion of the base of the projectile and then a terminal portion constituted by the shoulder, the inner face of the shoulder being in contact with the projectile.

18. The cartridge according to claim 17, wherein the length of the second portion is at least equal to a third of the length of the terminal portion.

19. The cartridge according to claim 11, wherein the caliber of the cartridge is 5.56 mm.

20. The cartridge according to claim 19, wherein the caliber of the cartridge is 5.56 mm and the maximum length of the cartridge is 57.4 mm (2.26 in).

21. The cartridge according to claim 11, wherein the ratio between the length of the nose of the projectile and the diameter of the projectile is about 3.5.

22. The cartridge according to claim 11, wherein the caliber of the cartridge is 7.62 mm.

23. The cartridge according to claim 11, wherein the caliber of the cartridge is 12.7 mm.

24. The cartridge according to claim 22, wherein the caliber of the cartridge is 7.62 mm and the maximum length of the cartridge is 71.9 mm (2.83 in).

25. The cartridge according to claim 23, wherein the caliber of the cartridge is 12.7 mm and the maximum length of the cartridge is 140.8 mm (5.545 in).