Firearms – Muzzle loaders
Reexamination Certificate
2000-06-02
2001-11-06
Jordan, Charles T. (Department: 3644)
Firearms
Muzzle loaders
Reexamination Certificate
active
06311421
ABSTRACT:
BACKGROUND OF THE INVENTION
Conventional muzzle-loading rifles include a barrel which extends forwardly from a receiver, the rearward end of the barrel having a breech which receives propellant and projectile through the muzzle. A breech plug is threadably mounted in the receiver and seals the rearward end of the barrel, in the breech, to prevent blow back of gases upon ignition of the propellant within the breech.
In percussion muzzle-loaders a percussion element is positioned rearwardly of the breech plug such that when struck by a hammer, the percussion element is fired and an ignition flame travels through a central bore in the breech plug to ignite the propellant in the breech. Conventional breech plugs work fine with loose powder, but are less effective with powder in pellet form.
One problem with a conventional breech plug is that it limits the area of exposure on the base of the pelletized powder that is exposed to the burning gases from the ignition source. This results in slower ignition, velocity, and lock time.
It is therefore a general object of the present invention to provide an improved breech plug for a muzzle-loading rifle.
Another object of the present invention is to provide a breech plug that improves the ignition of a pelletized powder charge.
Another object of the present invention is to provide an improved breech plug which will increase the area of exposure of the propellant base to the ignition charge.
Another object of the present invention which provides a faster ignition, greater velocity, and increased lock time.
These and other objects will be apparent to those skilled in the art.
SUMMARY OF THE INVENTION
The breech plug of the present invention has an elongated body with external threads. The breech plug is threadably mounted adjacent to the rearward end of the bore of the barrel of a conventional muzzle-loading rifle. The body has a forward and rearward end with a circular depression in the forward end surrounded by an annular rim. The annular rim has a diameter slightly less than the diameter of the bore of the rifle.
The circular depression has a tapered bottom surface that slopes inwardly and rearwardly and terminates in a center portion in communication with a center bore that extends longitudinally along a center axis of the body.
Within the circular depression are a pair of intersecting grooves that extend across the depression. The grooves have outer ends that extend from the rim inwardly and rearwardly across the tapered bottom surface to the center portion in communication with the center bore of the body to permit an ignition flame emerging from the center bore to move forwardly and outwardly through the grooves to the inner diameter of the bore of the barrel to ignite a pelletized powder charge.
REFERENCES:
patent: 5010677 (1991-04-01), Carron
patent: 5561934 (1996-10-01), Knight
patent: 5644861 (1997-07-01), Knight
patent: 5651203 (1997-07-01), Knight
patent: 5706598 (1998-01-01), Johnston
patent: 5860240 (1999-01-01), Ball et al.
patent: 6176030 (2001-01-01), Ball
Ebsco Industries Inc.
Jordan Charles T.
Shaw Elizabeth
Zarley McKee Thomte Voorhees & Sease
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