Pressure regulating composite cartridge
First Claim
1. A cartridge for use in a rifle having a cartridge receiving chamber, said cartridge comprising a head interfitted with a plastic casing, said casing having a bullet end and a head end, said bullet end having a bullet receiving recess adapted to receive a bullet in a frictional engagement and having a pressure regulating front partition separating said bullet recess from a powder chamber, said pressure regulating front partition being molded integrally with said casing and having a frangible annulus whereby said partition resists removal thereof until a predetermined pressure is achieved in said chamber by an ignited propellant charge, said casing further providing a space between said partition and said bullet whereby, upon propellant ignition and separation of the partition, said space is pressurized before movement of the projectile begins to stabilize said casing adjacent to said space against said chamber;
- an external interlock surface at said head end, a cartridge head having a casing engaging recess at one end thereof and a primer receiving recess in the other end thereof, said casing engaging recess receiving said casing therein and extending toward said bullet receiving end around the outside of said external interlock surface and fairing with said casing.
20 Assignments
0 Petitions
Accused Products
Abstract
A plastic cased metal headed ammunition casing for high powered rifle and cannon cartridges is described in which the plastic case has a pressure regulating baffle or wall in the forward and thereof to regulate and control the development of chamber pressure and directs pressure into a space around the bore of the projectile prior to movement of the projectile. 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. An expandable sleeve may be used to stabilize the head-casing interfit. The head provides sufficient resistance to the residual pressure after firing so that the cartridge can be used in rapid fire automatic weapons.
290 Citations
14 Claims
-
1. A cartridge for use in a rifle having a cartridge receiving chamber, said cartridge comprising a head interfitted with a plastic casing, said casing having a bullet end and a head end, said bullet end having a bullet receiving recess adapted to receive a bullet in a frictional engagement and having a pressure regulating front partition separating said bullet recess from a powder chamber, said pressure regulating front partition being molded integrally with said casing and having a frangible annulus whereby said partition resists removal thereof until a predetermined pressure is achieved in said chamber by an ignited propellant charge, said casing further providing a space between said partition and said bullet whereby, upon propellant ignition and separation of the partition, said space is pressurized before movement of the projectile begins to stabilize said casing adjacent to said space against said chamber;
- an external interlock surface at said head end, a cartridge head having a casing engaging recess at one end thereof and a primer receiving recess in the other end thereof, said casing engaging recess receiving said casing therein and extending toward said bullet receiving end around the outside of said external interlock surface and fairing with said casing.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
-
8. A method of manufacturing a rifle cartridge comprising the steps of:
-
molding a substantially cylindrical plastic cartridge casing having a bullet receiving end and a head receiving end, said bullet receiving end having a bullet recess to receive a bullet and having a pressure regulating front partition at the base of the bullet recess extending across the casing separating the bullet recess from a powder chamber, said bullet recess formed to hold the bullet at a spaced apart relationship with said partition so that an open space is present at the base of said whereby upon ignition of the propellant in said case, said partition fractures and pressurizes said open space before said projectile moves, and said head receiving end having a circumferential head interlock surface thereon; forming a cartridge head having a coaxial primer recess and a coaxial casing receiving recess, said casing receiving recess having interior grooves and ridges adapted to interfit with complementary ridges and grooves on the exterior of said casing; placing a charge of propellant in said casing; placing a deformable expansion sleeve into said cartridge; and
,assembling said casing and said head. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification