METALLIC MOUTH FOR A PLASTIC CARTRIDGE CASE

• US 3,842,739 A
• Filed: 05/31/1973
• Issued: 10/22/1974
• Est. Priority Date: 05/31/1973
• Status: Expired due to Term

• Current Assignee: John J. Scanlon, Raymond A. Anderson, Thomas G. Owen
• Original Assignee: John J. Scanlon, Raymond A. Anderson, Thomas G. Owen
• Inventors: Owen, Thomas G., Scanlon, John J., Anderson, Raymond A.
• Primary Examiner(s): Borchelt, Benjamin A.
• Assistant Examiner(s): Jordan, C. T.
• Application Number:
  US05/365,590
• Time in Patent Office: 509 Days
• Field of Search: 102/43P
• US Class Current: 102/467
• CPC Class Codes: F42B 5/073 using an auxiliary locking element
• CPC Class Codes: F42B 5/307 formed by assembling several elements

Abstract

A cartridge case having a plastic body has a metallic tubular mouth member affixed thereto. A generally cylindrical projectilereceiving portion may be crimped to securely hold a projectile and a rear portion of the mouth member is tapered to match the inner contour of the plastic case. Interaction of a circumferential rib with a forward gum chamber wall and the interaction of matching shoulders on the mouth member and the plastic body prevent separation of the mouth member from the cartridge case during firing, extraction and ejection. The mouth member provides enhanced reloadability for the cartridge case and produces a center of gravity matching that of metallic cartridge cases for optimum ejection characteristics.

Claims

1. In a cartridge case having a plastic body with an inwardly tapered forward end portion, the improvement comprising a tubular mouth member having a generally cylindrical projectile-receiving portion and a generally frusto-conical interlocking portion, the mouth member being secured within the plastic body with the inwardly tapered forward end portion of the plastic body engaging the interlocking portion of the mouth member and with the projectile-receiving portion extending forwardly of the plastic body.

2. The cartridge case of claim 1 wherein said plastic body has an inner surface and said metal mouth member includes a rear portion extending from said interlocking portion for tightly engaging the inner surface of said plastic body.

3. The cartridge case of claim 1 wherein said mouth member includes a circumferential rib positioned at a forward end of said interlocking portion.

4. The steel case of claim 1 wherein said mouth member is steel.

5. The cartridge case of claim 1 wherein the inwardly tapered forward end portion of said plastic body is bonded to the interlocking portion of said mouth member.

6. A mouth member for a multi-component cartridge case, said mouth member comprising a tubular projectile-receiving portion, a tubular rear portion, a generally frusto-conical interlocking portion joining the projectile-receiving portion and the rear portion, and a circumferential rib positioned at one end of the interlocking portion adjacent to the projectile-receiving portion.

7. In a cartridge for firing in a gun chamber having a tapered forward wall, said cartridge including a cartridge case having a body with a tapered forward end portion, the improvement comprising a unitary tubular mouth member having a generally cylindrical projectile-receiving portion, a generally frusto-conical interlocking portion positioned within the forward end portion of the body, and a circumferential rib positioned between the projectile-receiving portion and the interlocking portion for engaging a forward wall of a gun chamber during firing of the cartridge.

8. A cartridge case comprising a body having an inwardly tapered forward end portion and a mouth member having a tubular projectile-receiving portion, a generally frusto-conical interlocking portion for positioning within the tapered forward end portion of the body, and a circumferential rib joining the projectile-receiving portion and the interlocking portion.

9. The cartridge case of claim 8 wherein the forward end portion of said body has an outer surface and said circumferential rib has an outer surface adjoining the outer surface oF said forward end portion.

10. The cartridge case of claim 8 wherein said mouth member has a tubular rear portion extending from said attachment portion a predetermined distance along said body.