Propellent-charge cartridge case

• US 3,948,178 A
• Filed: 02/11/1974
• Issued: 04/06/1976
• Est. Priority Date: 02/17/1973
• Status: Expired due to Term

• Current Assignee: Rheinmetall GmbH
• Original Assignee: Rheinmetall GmbH
• Inventors: Prochnow, Jurgen, Luther, Hans Werner
• Primary Examiner(s): Feinberg, Samuel
• Assistant Examiner(s): Jordan, C. T.
• Application Number:
  US05/441,002
• Time in Patent Office: 785 Days
• Field of Search: 102/43 R, 102/43 P
• US Class Current: 102/464
• CPC Class Codes: F42B 5/26 Cartridge cases F42B5/18 takes precedence ; manufacturing of cartridge cases B21K21/04

Abstract

A propellent-charge cartridge case which comprises a cartridge-case stub which has a cartridge-case wall and includes at least one part provided with a resilient gas check which can be pressed against a barrel wall. The cartridge-case wall is formed with an annular groove cut from the outside into the cartridge-case wall which weakens the cross section of the wall. A resilient insert fills the annular groove so that as gas pressure builds up within the cartridge case upon firing, the cartridge case stub is deformed in the region of the annular groove so as to reduce the size thereof and squeeze the insert out of the annular groove in gas-sealing manner against the barrel wall.

Claims

1. A propellent-charge cartridge case comprising a cartridge-case stub having a base and a cartridge case wall extending axially from said base, an annular external groove formed in said wall and adapted to be juxtaposed with the internal wall of a barrel receiving the cartridge case, a resilient insert filling said annular groove and adapted to be pressed against said barrel wall upon the discharge of a charge received in said case, and an internal groove in said cartridge case wall in the region of said external groove for weakening said cartridge case wall.

2. In a cartridge having a propellent charge and adapted to sealingly engage a barrel in which said cartridge is discharged, the improvement which comprises a cartridge case having an annular wall confronting a wall of said barrel;

a groove formed in said wall of said cartridge case and opening in the direction of said barrel wall;

a region of reduced cross section along said wall of said cartridge case at said groove deformable outwardly by the firing of a charge within said cartridge; and

a resilient insert received in said groove and displaced at least partly therefrom upon deformation of said region into sealing engagement with said wall of said barrel, said wall of said case being formed with an internal groove in the plane of the first mentioned groove and defining therewith said region.