Cartridge Base and Plastic Cartridge Case Assembly for Ammunition Cartridge

• US 20120024183A1
• Filed: 07/30/2010
• Published: 02/02/2012
• Est. Priority Date: 07/30/2010
• Status: Active Grant

• Current Assignee: Pcp Tactical, LLC
• Original Assignee: MNP Corporation
• Inventors: Klein, Thomas R.
• Granted Patent: US 8,573,126 B2
• Time in Patent Office: Days
• US Class Current: 102/467
• CPC Class Codes: F42B 5/307 formed by assembling several elements
• CPC Class Codes: F42B 5/36 modified for housing an integral firing-cap

Abstract

A cartridge for ammunition has a base with an axial end section. An annular wall extends from the enlarged outer peripheral lip section to an opposite end. The axial end section has a primer cavity therein and a radially outwardly extending peripheral extraction lip. An annular ledge is axially positioned at an inner end of said primer cavity and radially extends inwardly from said annular wall. A passage has a reduced diameter compared to the primer cavity and extends through the annular ledge. A main charge cavity is at an opposite side of the ledge from the primer cavity. A knurl section is on an outer surface of said cylindrical wall. A cartridge case is attached to the base about said knurl section.

Claims

1. A cartridge for ammunition, said cartridge comprising:

a base having an axial end section having a primer cavity therein and a radially outwardly extending peripheral extraction lip;

an annular wall extending from said enlarged outer peripheral lip section to an opposite end;

an annular ledge axially positioned at an inner end of said primer cavity and radially extending inwardly from said annular wall;

a passage having a reduced diameter compared to said primer cavity and extending through said annular ledge;

a main charge cavity at an opposite side of said ledge from said primer cavity and within the confines of the annular wall;

a knurl section on an outer surface of said annular wall;

said knurl section having canted grooves thereon; and

a cartridge case attached to the base about said knurl section.

2. A cartridge as defined in claim 1 further comprising:

said knurl section axially aligned in part with said annular ledge and fully circumscribes said outer surface of said annular wall.

3. A cartridge as defined in claim 1 further comprising:

said base being made from carbon steel.

4. A cartridge as defined in claim 3 further comprising:

said knurl section comprising cross-hatched canted grooves thereon to form diamond shaped hatchings.

5. A cartridge as defined in claim 1 further comprising:

said knurl section comprising cross-hatched canted grooves thereon to form diamond shaped hatchings.

6. A cartridge as defined in claim 5 further comprising:

said base being made from carbon steel.

7. A cartridge for ammunition, said cartridge comprising:

a base having an interior cavity section for storing a charge;

said base having an annular wall with an outer surface;

said outer facing surface having an annular knurl section having cross-hatched grooves forming diamond shaped hatchings; and

a cartridge case connected about said annular wall and to said knurl section.

8. A cartridge as defined in claim 7 further comprising:

said cross-hatching grooves being canted with respect to the axial axis of said cartridge.

9. A cartridge as defined in claim 8 further comprising:

said knurl section axially aligned in part with a thickened section of said annular wall.

10. A cartridge as defined in claim 9 further comprising:

said base having an enlarged diameter extraction lip at an axial end section.

11. A cartridge as defined in claim 10 further comprising:

said base being made from carbon steel.

13. A cartridge as defined in claim 9 further comprising:

said knurl section formed by grooves angled with respect to a longitudinal axis of said cartridge.

14. A cartridge as defined in claim 10 further comprising:

said grooves forming diamond shaped hatchings.

15. A cartridge as defined in claim 14 further comprising:

said base being made from carbon steel.

12. A cartridge for ammunition;

said cartridge comprising;

said base having an annular wall extending to said open front end defining an interior cavity;

said interior cavity extending from an open front end to an annular ledge radially inwardly extending from said annular wall and axially positioned between said open front end and a rear end;

said annular wall section having an knurl section axially aligned in part with said ledge; and

a plastic cartridge case having a rear end with an outer flange for extending about said annular wall and engaging said knurl section and an inner flange extending about said cavity inside said annular wall such that said annular outer wall is sandwiched between said inner and outer flanges with said knurl section engaging said outer flange.

16. A cartridge as defined in claim 12 further comprising:

said knurl section formed from cross-hatched grooves to form diamond shaped hatchings.

17. A cartridge as defined in claim 16 further comprising:

said base being made from carbon steel.

18. A base for an ammunition cartridge case, said base comprising:

an axial end section having a primer cavity therein and a radially outwardly extending peripheral extraction lip;

an annular wall extending from said enlarged outer peripheral lip section to an opposite end;

an annular ledge axially positioned at an inner end of said primer cavity and radially extending inwardly from said annular wall;

a passage having a reduced diameter compared to said primer cavity extending through said annular ledge;

a main charge cavity at an opposite side of said ledge from said primer cavity and within the confines of the annular wall;

a knurl section on an outer surface of said annular wall; and

said knurl section having angular canted grooves thereon.

19. A base as defined in claim 18 further comprising:

said knurl section axially aligned in part with said annular ledge and fully circumscribes said outer surface of said annular wall.

20. A base as defined in claim 18 further comprising:

said base being made from carbon steel.

21. A base as defined in claim 20 further comprising:

said knurl section comprising cross-hatched angular grooves thereon to form diamond shaped hatchings.

22. A method of manufacturing a composite ammunition cartridge comprising:

pressure forming a metallic base with an axial end section having a primer cavity therein and a radially outwardly extending extraction lip;

an annular wall being pressure formed to extend from said enlarged outer peripheral lip section to an opposite end;

an annular ledge being pressure formed and axially positioned at an inner end of said primer cavity and radially extending inwardly from said annular wall;

a passage being formed with a reduced diameter compared to said primer cavity and extending through said annular ledge;

a main charge cavity being pressure formed at an opposite side of said annular ledge from said primer cavity;

a knurl section being pressure formed on an outer surface of said annular wall;

said knurl section having grooves pressure formed thereon; and

a cartridge case being molded about the periphery of an outer surface of the annular wall and intruding into said knurl section.

23. A method as defined in claim 22 further comprising:

said pressure forming being high speed cold forming.

24. A method as defined in claim 23 further comprising:

said metallic base being made from carbon steel.

25. A method as defined in claim 22 further comprising:

said metallic base being made from carbon steel.

26. A method as defined in claim 25 further comprising:

said cartridge case having an outer flange molded about said periphery of said annular wall and intruding into said knurl section; and

said cartridge case having an inner flange molded within said annular wall.