Ordnance – Barrels – Recoil absorbers and climb arrestors
Reexamination Certificate
1999-05-14
2001-04-17
Johnson, Stephen M. (Department: 3641)
Ordnance
Barrels
Recoil absorbers and climb arrestors
Reexamination Certificate
active
06216578
ABSTRACT:
FIELD OF THE INVENTION
The technical scope of the present invention is that of muzzle brakes for gun barrels, notably large caliber.
DESCRIPTION OF THE RELATED ART
A muzzle brake usually incorporates at least two transversal vents which make the inside of the brakes communicate with at least two vanes receiving the gases, such vanes being integral with the outside of the brake.
When a projectile is fired, the propellant gases are guided by the vents towards the vanes on which they exert a thrust thereby offsetting the gun barrel recoil.
Pat. U.S. Pat. No. 1,363,058 shows such a muzzle brake.
Muzzle brakes are commonly employed in the scope of field artillery, however, their use its reduced with respect to artillery equipping tanks or vehicles because of the disturbances they cause when arrow ammunition, or sub-calibred discardable-sabot projectiles, are being fired.
Indeed, any rifling of the barrel as well as the aerodynamic force exerted on such a projectile upon exiting the gun barrel causes the onset of the separation of the sabot and projectile inside the brake.
Such a separation deteriorates the brake and causes an angle of yaw which seriously disturbs its trajectory and prejudices firing accuracy.
To overcome such a drawback the diameter of passage for the projectile through the brake has been increased, but such a choice leads to a substantial reduction in the efficiency of the brake thereby increasing the stresses to which the tank or the barrel-carrying vehicle are subjected.
BRIEF SUMMARY OF THE INVENTION
The aim of the invention is to propose a muzzle brake that does not suffer from such drawbacks.
Thus, the muzzle brake according to the invention enables (whilst providing excellent efficiency) any initial disturbance of the projectile trajectory to be avoided as well as any deterioration of the inner surfaces of the brake.
Thus, the subject of the invention is a muzzle brake for a gun barrel, notably large caliber, and incorporating at least two vents making the inside of the brake communicate with at least two vanes receiving the gases that are integral with the outside of the brake, such brake having at least one internal cylindrical support of the same caliber as the barrel and placed downstream of the vents according to the direction of movement of a projectile fired from the barrel, wherein said internal cylindrical support is separated from said vent or vents that precede it by a concave surface of revolution whose concavity is oriented towards the rear of said brake.
According to a particular embodiment, said surface of revolution is a conical surface.
Advantageously, said surface of revolution extends longitudinally for a length of between 1.5 and 4 times the length of said cylindrical support.
The maximal diameter of said surface of revolution is preferably between 108% and 112% of the caliber D of the barrel.
According to a particular embodiment, said brake comprises at least two levels each formed by at least two vents and at least two vanes receiving the gases, the two consecutive levels being separated by a cylindrical support preceded by a surface of revolution.
REFERENCES:
patent: 817134 (1906-04-01), Smith
patent: 1363058 (1920-12-01), Schneider
patent: 1854974 (1932-04-01), Bernat
patent: 2567826 (1951-09-01), Prache
patent: 3368453 (1968-02-01), Shaw
patent: 3492912 (1970-02-01), Ashbrook
patent: 5036747 (1991-08-01), McClain, III
patent: 244079 (1947-01-01), None
patent: 825614 (1938-03-01), None
patent: 825614 (1938-09-01), None
patent: 911049 (1946-06-01), None
patent: 606478 (1948-08-01), None
Bachelier Jacques
Ledys Francis
Giat Industries
Johnson Stephen M.
Parkhurst & Wendel L.L.P.
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