Composite cartridge for high velocity rifles and the like
First Claim
Patent Images
1. A method of manufacturing a rifle cartridge comprising the steps of:
- molding a substantially cylindrical plastic cartridge having a bullet receiving end forming a bullet recess;
an open, head receiving end with a circumferential head interlock surface thereon;
a casing axially disposed between said ends with a thickened shoulder formed therein,; and
a pressure regulating front partition extending across the casing separating the bullet recess from a powder chamber at said thickened shoulder, said partition having a frangible annular zone designed to be severed cleanly completely around the periphery thereof;
forming a cartridge head having a coaxial primer recess and a coaxial casing receiving recess, said casing receiving recess comprising a deformable skirt adapted to be swaged into contact about said circumferential head interlock surface;
placing a charge of gunpowder in said casing;
placing a primer in said primer recess;
assembling said casing and said head; and
,swaging said deformable skirt about said head interlock surface to firmly interconnect said casing and said head.
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Accused Products
Abstract
A plastic cased metal headed ammunition casing for high powered rifle cartridges is described in which the plastic case has a pressure regulating baffle or wall in the forward end thereof to regulate and control the development of chamber pressure movement of the bullet into the rifle barrel. The cartridge is charged with a given charge of powder and the cap or head securely fastened to the rearward portion of the plastic casing. The head provides sufficient resistance to the residual pressure after firing so that the cartridge can be used in rapid fire automatic weapons.
259 Citations
15 Claims
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1. A method of manufacturing a rifle cartridge comprising the steps of:
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molding a substantially cylindrical plastic cartridge having a bullet receiving end forming a bullet recess;
an open, head receiving end with a circumferential head interlock surface thereon;
a casing axially disposed between said ends with a thickened shoulder formed therein,; and
a pressure regulating front partition extending across the casing separating the bullet recess from a powder chamber at said thickened shoulder, said partition having a frangible annular zone designed to be severed cleanly completely around the periphery thereof;forming a cartridge head having a coaxial primer recess and a coaxial casing receiving recess, said casing receiving recess comprising a deformable skirt adapted to be swaged into contact about said circumferential head interlock surface; placing a charge of gunpowder in said casing; placing a primer in said primer recess; assembling said casing and said head; and
,swaging said deformable skirt about said head interlock surface to firmly interconnect said casing and said head. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing ammunition comprising the steps of:
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molding a substantially cylindrical plastic cartridge having a bullet receiving end forming a bullet recess, an open, head receiving end with a circumferential head interlock surface thereon, a casing axially disposed between said ends having a thickener shoulder therein adjacent said bullet receiving end; and
a pressure regulating front partition extending across the casing at said thickened shoulder separating the bullet recess from a powder chamber;forming a cartridge head having a coaxial primer recess and a coaxial casing receiving recess having an inside diameter approximately equal to the outside diameter of said casing; placing a charge of gunpowder into said casing; placing a primer in said primer recess; forcing said head and said casing together axially whereby said head receiving end is inserted within said head. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification