Metal working – Bias cutting of tubular stock
Reexamination Certificate
2000-01-26
2001-05-22
Carone, Michael J. (Department: 3641)
Metal working
Bias cutting of tubular stock
C029S002100, C029S002100, C408S07200R, C408S07200R, C408S11500B, C408S11500B
Reexamination Certificate
active
06233799
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to cylinders for guns and, more particularly, to a cylinder sizer and method of enlarging at least a portion of a chamber of a cylinder for a gun.
2. Description of the Related Art
It is known to provide cylinders for guns. Typically, the cylinder includes a central aperture extending therethrough and a first mounting portion surrounding the central aperture at one axial end and a second mounting portion surrounding the central aperture at the other axial end thereof for allowing the cylinder to be mounted to the gun. The cylinder also includes a plurality of chambers disposed circumferentially about the central aperture and extending axially therethrough to receive a cartridge of a standard size.
Typically, each chamber has a rim portion at one axial end adjacent a breach side of the gun and a throat portion at the other end adjacent a muzzle side of the gun. The throat portion tapers axially and radially inward to reduce the diameter of the chamber. The cartridge has a cartridge case with a rim disposed in the rim portion and extending into the chamber and a bullet at the end of the cartridge case disposed adjacent the throat portion. When the cartridge is discharged, the bullet travels through the throat portion of the chamber into a barrel of the gun. In the barrel, the bullet travels through a forcing cone and engages riffling in the barrel to exit the gun on a true plane.
Although cartridges are manufactured in standard sizes, some gun operators use outdated, non-standard or “special” cartridges for shooting. These cartridges typically have a bullet with a diameter slightly larger than the diameter of the throat portion of the chambers. When the cartridge is fired, the bullet enters the throat portion, which shaves or removes material from the bullet, distorting the travel of the bullet through the forcing cone and barrel, resulting in inaccurate travel. As a result, it is necessary to enlarge the diameter of the throat portion of the chambers. However, the throat portion of the chambers must be enlarged in an accurate manner of else the bullets of the cartridges will not exit the barrel on a true plane.
It is desirable to provide a cylinder sizer to enlarge at least a portion of the chambers of a cylinder for a gun. It is also desirable to enlarge either all or a portion of chambers of a cylinder for a gun in an accurate or true manner. It is further desirable to provide a method for enlarging at least a portion of chambers of a cylinder for a gun to a desired size.
SUMMARY OF THE INVENTION
It is, therefore, one object of the present invention to provide a cylinder sizer.
It is another object of the present invention to provide a cylinder sizer that enlarges at least a portion of chambers of a cylinder for a gun to a predetermined size.
It is yet another object of the present invention to provide a method of enlarging at least a portion of chambers of a cylinder for a gun.
To achieve the foregoing objects, the present invention is a cylinder sizer including a base, a slide cooperating with the base and movable relative thereto and a lock fastener to extend through a central aperture of a cylinder for a gun and engaging the slide. The cylinder sizer also includes an alignment member to extend through a chamber of the cylinder and operatively engaging the base for aligning the cylinder relative to the base. The cylinder sizer further includes a cutting tool to extend into the chamber of the cylinder and operatively engaging the base for enlarging at least a portion of the chamber.
Additionally, the present invention is a method of enlarging at least a portion of a chamber of a cylinder for a gun. The method includes the steps of providing a cylinder for a gun and providing a cylinder sizer having base, a slide cooperating with the base and movable relative thereto, and a lock fastener to extend through a central aperture of a cylinder for a gun and engaging the slide. The method also includes the steps of providing an alignment member and extending the alignment member through a chamber of the cylinder and engaging the base and aligning the cylinder relative to the base. The method further includes the steps of providing a cutting tool and extending the cutting tool into the chamber of the cylinder and engaging the base and enlarging a least a portion of the chamber of the cylinder to a predetermined size.
One advantage of the present invention is that a cylinder sizer is provided for enlarging at least a portion of chambers of a cylinder for a gun. Another advantage of the present invention is that the cylinder sizer enlarges either the throat portion or the entire chamber of a cylinder of a gun to a non-standard predetermined size. Yet another advantage of the present invention is that the cylinder sizer enlarges a diameter of at least a portion of the chambers of a standard cylinder for a gun to accept a non-standard or special bullet of the cartridge. Still another advantage of the present invention is that the cylinder sizer enlarges the chambers of a standard cylinder for a gun in a true or accurate manner. A further advantage of the present invention is that a method is provided of enlarging chambers of a cylinder for a gun to a predetermined size.
Other objects, features and advantages of the present invention will be readily appreciated, as the same becomes better understood, after reading the subsequent description when considered in connection with the accompanying drawings.
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Bliss McGlynn P.C.
Carone Michael J.
Semunegus Lulit
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