Abrading – Abrading process – Utilizing fluent abradant
Reexamination Certificate
1999-04-08
2001-04-03
Rose, Robert A. (Department: 3723)
Abrading
Abrading process
Utilizing fluent abradant
C451S051000, C042S095000, C042S076010
Reexamination Certificate
active
06210253
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to shotguns and more particularly concerns the finish of the bore of a shotgun barrel.
Shotgun barrel bores are now generally “hone” finished to an approximately Ra 15 to Ra 17 surface grade with resulting striations oriented in a generally rotational direction in the bore. Since the striations are transverse to the path of shot and gasses traveling in the barrel, the shotgun demonstrates greater recoil and lower muzzle velocity than could have been achieved if the striations were not present.
It is, therefore, an object of this invention to provide a shotgun barrel having a bore which is striated in a generally longitudinal direction along the barrel. Another object of this invention is to provide a shotgun barrel having a bore finish that minimizes recoil of the weapon. A further object of this invention is to provide a shotgun barrel having a bore finish that maximizes the muzzle velocity of the weapon. It is also an object of this invention to provide a method for polishing the bore of a shotgun barrel to a high surface grade in comparison to the finishes achieved by conventional “hone” finishing methods. Yet another object of this invention is to provide a method for polishing the bore of a shotgun barrel which results in minimizing non-longitudinal striations on the bore surface. And it is an object of this invention to provide a method for polishing the bore of a shotgun barrel which results in generally longitudinal striations on the bore surface.
SUMMARY OF THE INVENTION
In accordance with the invention, a method is provided for refinishing the bore of a shotgun barrel by pumping a relatively soft abrasive media longitudinally through the bore, thus achieving a higher surface grade. Use of the method further results in the bore having striations oriented in a longitudinal direction along the barrel. Since the striations are along the path of the shot and gasses which travel in the barrel, significant reduction in the felt recoil and increase in the muzzle velocity of the weapon is achieved.
In practicing the method for finishing the shotgun barrel, the gunsmith swabs the bore to remove dust. The bore is inspected to detect obstructions and blemishes and then secured to a support structure in a horizontal orientation. The grade of the surface finish of the bore is determined. A polishing media pumping system is connected to the receiver end of the barrel and all holes through the barrel wall are blocked. A silicone matrix media impregnated with silicon carbide is pumped from the receiver end of the barrel through the bore and out the muzzle end of the barrel to polish the bore until the bore striations are generally longitudinal. The barrel is disconnected from the pumping system and the support structure and excess media cleaned out of the bore. All blocking materials are removed from the barrel and air blown through the bore to clean out residue. A liquid cleaner is applied to the bore to remove oils and the like and the bore is swabbed. The grade of the surface finish of the polished bore is determined. If necessary, the barrel is resecured to the support structure and the previous steps repeated as necessary until a satisfactory grade of surface finish is achieved.
REFERENCES:
patent: 2298775 (1942-10-01), Raiche
patent: 3634973 (1972-01-01), McCarty
patent: 3699725 (1972-10-01), Feldcamp
patent: 5203883 (1993-04-01), Perry
patent: 5378499 (1995-01-01), Martin et al.
patent: 6112447 (2000-09-01), Androsov
Catalano Frank J.
Rose Robert A.
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