Plastic cartridge case for high pressure center fire ammunition having multi-component stamped metal head

• US 3,874,294 A
• Filed: 01/02/1973
• Issued: 04/01/1975
• Est. Priority Date: 01/02/1973
• Status: Expired due to Term

• Current Assignee: Hale H. Jackson
• Original Assignee: Hale H. Jackson
• Inventors: Hale, H. Jackson
• Primary Examiner(s): Stahl, Robert F.
• Application Number:
  US05/320,328
• Time in Patent Office: 819 Days
• Field of Search: 102/43R,43P,44,38,39,40,41,45
• US Class Current: 102/467
• CPC Class Codes: F42B 33/001 Devices or processes for assembling ammunition, cartridges or cartridge elements from parts
• CPC Class Codes: F42B 5/307 formed by assembling several elements

Abstract

A center fire cartridge case for high pressure cartridges has a plastic body and a metallic head. The head is assembled solely from inexpensive, easily manufactured components which positively interlock to maintain the structural integrity of the cartridge case. Interaction of head components forms an extractor groove without the need for a turning operation.

Claims

1. A cartridge case for a high-powered center fire cartridge comprising a plastic casing with a rearward end, a transverse wall defining a flash hole, and a rearwardly extending skirt, a metallic tubular reinforcing sleeve positioned around the skirt, a metallic extraction rim having a central opening and positioned against the rearward end of the casing for holding the reinforcing sleeve against Removal from the casing, and a metallic cup member having an outwardly directed peripheral flange at a rear end portion and a tubular extension at a forward end portion and being positioned within the skirt and the central opening of the extraction rim with the tubular extension extending through the flash hole and the peripheral flange holding the extraction rim against removal, the tubular extension being outwardly flared to abut the transverse wall in interlocking relationship.

2. A cartridge case as in claim 1 wherein said reinforcing sleeve has a rear end portion of reduced diameter and the rear end portion and said extraction rim form an extractor groove for the cartridge case.

3. A cartridge case as in claim 2 wherein said reinforcing sleeve is a steel stamping.

4. A cartridge case as in claim 1 wherein said extraction rim has a peripheral groove around said central opening for containing the peripheral flange of said cup member.

5. A cartridge case as in claim 1 wherein said reinforcing sleeve has a rear surface and said extraction rim abuts said rear surface in lateral engaging relationship.

6. A cartridge case for a high-powered center fire cartridge comprising a plastic casing with a rearward end, a transverse wall defining a flash hole, and a rearwardly extending skirt, a metallic tubular reinforcing sleeve positioned around the skirt, and a metallic cup member having an outwardly directed peripheral flange at a rear end portion and a tubular extension at a forward end portion, a portion of the flange being folded over to form an extraction rim, said cup member being positioned within the skirt with the tubular extension extending through the flash hole and the extraction rim holding the reinforcing sleeve against removal from the casing, the tubular extension being outwardly flared to abut the transverse wall in interlocking relationship.

7. A method of manufacturing a cartride case having a plastic body with a transverse wall and rearwardly extending skirt formed therein, the method comprising the steps of positioning a reinforcing sleeve around the skirt, positioning an extraction rim having a central opening rearwardly of the skirt and reinforcing sleeve, moving a flanged cup member through the central opening of the extraction rim to a position within the skirt so that its flanged portion abuts the extraction rim and a tubular extension protrudes through a flash hole in the transverse wall, and outwardly flaring the tubular extension thereby positively interlocking the rim, sleeve and cup to the plastic body.