Firearm Cartridge, Percussion Nipple and Forming Tool Therefor
a technology which is applied in the field of percussion nipples and cartridges, can solve the problems of reducing some of the force of the flash hole, causing the inside edge of the flash hole to burr,
Inactive Publication Date: 2015-01-29
NEERGAARD ARTHUR
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Benefits of technology
This patent describes a way to improve the performance of a firearm cartridge and a percussion nipple of a black powder rifle. The improvement involves making a flash hole in the cartridge and a shoulder in the percussion nipple with a curved surface that matches the shape of the flash hole. The tool used for this improvement has a concave curved surface that corresponds to the curved surface of the flash hole or the shoulder. This improvement can help to ensure a smoother and more reliable firing process in the firearm.
Problems solved by technology
This manufacturing operation occasionally results in a burr on the inside edge of the flash hole.
It is believed that the sudden restriction imposed by the upper ledge 30 chokes the flow of the gas, thereby diminishing some of its force.
Method used
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[0017]In incompressible flow (or gas flow at subsonic speeds of less than about Ma 0.7, where gas can effectively be modeled as incompressible), a constriction in pipe diameter will yield an increase in velocity, since mass flow rate along the pipe is theoretically constant. However, where there is compressible, or supersonic flow, as obtained from the detonation of a high explosive primer, a sudden constriction in a conduit will cause a choking condition or resistance that limits the flow of ignition gas through the constriction. It is believed that the amount of such resistance depends upon the shape of the constriction, particularly the inlet of the constriction. One that is perpendicular to the axis of the conduit will cause a loss that is greater than a chamfered inlet which, in turn, will cause flow loss that is greater than a rounded inlet constriction. As these losses are examined in the context of supersonic flow of ignition gas in a firearm cartridge, the flash hole may be...
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Abstract
The firearm cartridge has an upper chamber adapted to house gunpowder and a bullet, a lower pocket adapted to house a primer, and a flash hole extending there between. The lower pocket has a ledge disposed generally perpendicularly to the flash hole. The flash hole is formed with a perimeter wall that has a convex curvature adjacent to the ledge of the primer pocket. Likewise, a percussion nipple adapted for use in a black powder rifle has an elongated bore formed with relatively larger and smaller diameter portions connected by a shoulder, and the shoulder has a convex curvature adjacent to the larger diameter portion of the bore. The tool for forming the foregoing shapes has a tip provided with a concave curved surface corresponding to the convex curvature of the flash hole perimeter wall on the cartridge or to the convex curvature of the shoulder in the elongated bore of the percussion nipple.
Description
BACKGROUND[0001]The present invention relates to firearm cartridges and percussion nipples, and more specifically to the flash hole design of either a cartridge used in a modern firearm, or the nipple used in a percussion black powder firearm, and to a specialized drill used to produce these shapes.[0002]An ammunition cartridge typically consists of a brass or steel case having a main chamber filled with a propellant such as smokeless powder and a bullet seated in the front of the chamber. A recessed pocket is provided in a rear face of the cartridge to house a primer. One or two flash holes is / are punched in the wall separating the primer pocket from the chamber containing the propellant. When the primer is detonated, hot gas shoots through the flash hole(s) and into the chamber to ignite the propellant. There are two styles of cartridges. A “Boxer” cartridge has one central flash hole approximately 0.080″ to 0.090″ in diameter and a primer pocket approximately 0.175″ in diameter. ...
Claims
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IPC IPC(8): F41C9/08F42B33/00F42B5/36
CPCF41C9/08F42B33/00F42B5/36F42C19/0807F42C19/10
Inventor NEERGAARD, ARTHUR
Owner NEERGAARD ARTHUR