Claims
- 1. Ammunition for a small or medium calibre firearm, including
- a case secured to a base carrying a primer;
- a projectile contained in the case and constituted by a subcalibre bullet and sabot having the calibre of the firearm;
- a chamber disposed between the sabot and the base and filled with a propellant charge for propelling the projectile when the propellant charge is fired;
- the ammunition further comprising
- an annular chamber free of propellant charge positioned forwardly of the chamber filled with the propellant charge and separated from the latter by a partition wall in engagement with an inside of the case,
- said partition wall having at least one frangible area which is broken upon firing to provide for an expansion of combustion gases into the annular chamber, said frangible area being located at an outer cylindrical surface of said partition wall in contact with said case.
- 2. Ammunition according to claim 1, wherein each frangible area of the partition wall consists of a zone of reduced thickness of the partition wall.
- 3. Ammunition according to claim 1, wherein the sabot comprises decompression angular grooves on an outer surface thereof.
- 4. Ammunition according to claim 3, wherein the sabot is rigidly connected to the case through the angular grooves.
- 5. Ammunition according to claim 1, where the partition wall is additionally in engagement with the subcaliber bullet.
- 6. Ammunition according to claim 1, wherein the partition wall is solid with the projectile.
- 7. Ammunition according to claim 2, wherein the zones of reduced thickness consist of one or several grooves extending from the partition wall.
- 8. Ammunition according to claim 1, wherein the sabot has a profile co-operating with a portion of the bullet so as to constitute one or several baffles stopping the advancing motion of the combustion gases of the propellant charge.
- 9. Ammunition according to claim 1, wherein the sabot is made in two halves co-operating with one another so as to constitute one or several baffles stopping the advancing flow of the combustion gases of the propellant charge.
- 10. Ammunition for a small or medium caliber firearm, including
- a case secure to a base carrying a primer;
- a projectile contained in the case and constituted by a subcaliber bullet and a sabot having the caliber of the firearm;
- a chamber disposed between the sabot and the base and filled with a propellant charge for propelling the projectile when the propellant charge is fired;
- the ammunition further comprising:
- an annular chamber free of propellant charge and separated from the chamber filled with the propellant charge by a partition wall in engagement with an inside of the case and integral with the sabot.
- said partition wall having at least one frangible area which is broken upon firing to provide an expansion of combustion gases into the annular chamber,
- wherein each frangible area of the partition wall consists of a zone of reduced thickness of the partition wall, and comprises an even number of zones or reduced thickness having shape of lunules located on a rear surface on the partition wall adjacent to the chamber filled with propellant charge and regularly spaced from each other on a periphery of the partition.
Priority Claims (1)
Number |
Date |
Country |
Kind |
86 08094 |
Jun 1986 |
FRX |
|
Parent Case Info
This is a continuation, of application Ser. No. 055,901, filed 5/29/87, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (7)
Number |
Date |
Country |
3339078 |
May 1985 |
DEX |
1175139 |
Mar 1959 |
FRX |
1282119 |
Dec 1961 |
FRX |
2047780 |
Mar 1971 |
FRX |
2237169 |
Feb 1975 |
FRX |
2274888 |
Jan 1976 |
FRX |
480605 |
Feb 1938 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
55901 |
May 1987 |
|