Firearms – Barrels – Rifling or lining
Reexamination Certificate
1999-07-09
2001-12-04
Jordan, Charles T. (Department: 3641)
Firearms
Barrels
Rifling or lining
C089S014050
Reexamination Certificate
active
06324780
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to gun barrels.
2. Description of the Prior Art
Shotgun barrels and rifle barrels are elongated metallic tubes attached to a firing mechanism and a gun stock. Rifles get their name from the “rifling” provided within the gun barrel. Specifically, rifling is a system of spiral grooves formed in the surface of the bore of a gun barrel causing a bullet to rotate when fired. Rifling may also be provided on shotguns. This rotation results in a more accurate gun. The number of spiral grooves varies, depending on the bore size and other factors.
It is generally accepted that the thicker the gun barrel wall is, the more accurate the gun. As might be expected, thick walled gun barrels can add significant weight to the shotgun or the rifle. However, shotguns and rifles having thick walled barrels may be difficult to carry, especially through wooded areas. Further, in competition, different classes generally are determined by the weight of the firearm, i.e., rifle. In an effort to have a more accurate shooting rifle, yet a lighter rifle, straight flutes or grooves have been formed on the outer surface of the gun barrel, while rifling is present on the surface of the bore. Although the straight flutes or grooves provide some improvement, the straight flutes or grooves do not remove a substantial amount of the excess weight from the gun barrel.
Therefore, it is an object of the present invention to provide a strong, lightweight, and accurate gun barrel.
SUMMARY OF THE INVENTION
The present invention is a gun barrel that includes an open-ended hollow body, such as a hollow generally cylindrically-shaped barrel, having a first end, a second end, an inner surface and an outer surface. The inner surface defines a gun barrel bore and defines a plurality of internal helical or spiral grooves. The outer surface defines a plurality of external helical or spiral grooves. The number of internal spiral grooves equals the number of external spiral grooves. The internal spiral grooves and the external spiral grooves define sets of grooves defined by one of the internal grooves and one of the external grooves. Each set of grooves extends along a spiral. Each of the internal grooves are equally spaced apart and each of the external grooves are equally spaced apart. The plurality of external grooves preferably extends over a portion of the barrel between the two ends, while the internal grooves extend to the first end of the barrel. Preferably, each of the external grooves has a depth that is different than a depth of each of the internal grooves.
The present invention is also a gun that includes a gun stock and a firing mechanism attached to the above-described gun barrel.
Also, the present invention is a method for manufacturing a gun barrel that includes the steps of: providing a rod; forming a bore in the rod defining an interior surface; forming a plurality of internal spiral grooves in the interior surface; and forming a plurality of external spiral grooves on an exterior surface of the rod. Preferably, the number of external spiral grooves should be the same number of internal spiral grooves. Preferably, the method is accomplished with the aid of a four-axis computer aided machine.
REFERENCES:
patent: 315746 (1885-04-01), Costa De Arguibel
patent: 587801 (1897-08-01), Durnford
patent: 840085 (1907-01-01), Mulock
patent: 1167233 (1916-01-01), Warner
patent: 2609631 (1952-09-01), Garand
patent: 2792657 (1957-05-01), Slowter
patent: 3228298 (1966-01-01), Grandy et al.
patent: 3483794 (1969-12-01), Packard
patent: 3673916 (1972-07-01), Wittholz
patent: 3738044 (1973-06-01), Robinson
patent: 3777385 (1973-12-01), Hagan
patent: 5054224 (1991-10-01), Friar et al.
patent: 5664359 (1997-09-01), Sabranski et al.
Stoeger Publishing Company: Shooter's Bible No. 92 2001 Edition; pp. 185, 271.
E.R. Shaw, Inc.
Jordan Charles T.
Thomson Michelle
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
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