Wear reducing projectile

Details Wear reducing projectile Wear reducing projectile

1983-04-18

1985-04-30

Tudor, Harold J.

Ammunition and explosives

Projectiles

Lubricating

F42B 1120

Patent

active

045136688

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a projectile suitable for firing from a gun barrel and having means for dispensing an additive to the barrel to reduce barrel wear, herein referred to as a wear reducing projectile. In particular, but not exclusively, the projectile maybe a small arms bullet for firing from a rifled gun barrel.


BACKGROUND ART

Wear reducing rounds having gun barrel additive dispensing means embodied in either the projectile or its associated cartridge which do not substantially interfere with the desired firing mode of the gun into which the round is placed are known. On firing the round an additive is deposited along the barrel to reduce barrel wear by virtue of the additive's lubricating or thermal insulating properties.
The rate of application of a gun barrel wear reducing additive into a gun barrel ideally corresponds to wear severity along the barrel. Wear severity within a rifled gun barrel is typically at its worst in the region of the barrel bore close to the chamber of the gun where rifling commences, in which region the projectile experiences maximum rotational acceleration as it travels along the barrel. Thereafter, wear severity decreases as the projectile approaches the muzzle. The profile of wear severity along the barrel tends to be similar to that of the pressure of the propellant gas behind the projectile as the projectile is accelerated along the barrel.
An additive dispensing means embodied in the cartridge has the disadvantage that the inclusion of additive reduces the volume available for propellant: this is particularly disadvantageous in small arms rounds where the available propellant volume is small.
Additive dispensing means included in the projectile have hitherto relied upon inertial forces to release the additive from a store within the bullet as, for example, in the self-lubricating projectile described in UK Pat. No. 204,306. Such an additive dispensing means has the disadvantage that the additive is concentrated in the region where the projectile experiences maximum acceleration along the gun barrel which is typically one third the way along the barrel.


DISCLOSURE OF INVENTION

It is an object of the present invention to provide a wear reducing projectile having an additive dispensing means capable of providing a dispersion of additive more appropriate to wear severity distribution along the gun barrel.
According to the present invention there is provided a wear reducing projectile having a propellant opposable rear face transverse to a fore and aft axis characterised in barrel additive, face adjacent the charge and a propellant opposable rear face, and recess and the exterior of the projectile.
Preferably the recess is cylindrical and is in axial alignment with the fore and aft axis.
The gun barrel additive is preferably both a thermal insulator and a lubricant. The additive may be in a variety of forms ranging from various powder and grease combinations to liquids, but is preferably either a paste mixture of titanium dioxide and silicone grease, or a silicone oil which may be contained conveniently within a rupturable capsule.
The number of additive extrusion ports is preferably four, and the ports may either extend to the exterior of the projectile forward of its rear face, or may extend to the rear rearwardly through the piston.


BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, of which
FIG. 1 is an axial section of a wear reducing small arms bullet fully charged with a gun barrel additive paste extrudable to the exterior the bullet forward of its propellant opposable rear face and contained within a rigid recess,
FIG. 2 is an axial section of a wear reducing small arms bullet fully charged with a gun barrel additive liquid rearwardly extrudable to the exterior of the bullet through a piston,
FIG. 3 is an axial section of a wear reducing small arms bullet having a gun barrel additive liquid contained and sealed within a rupturabl

REFERENCES:
patent: 2444283 (1948-06-01), Detrich
patent: 3208387 (1965-09-01), Giles
patent: 3690255 (1972-09-01), Vass et al.

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