US 12,031,806 B2
Cartridge case for centerfire ammunition, and centerfire ammunition
Peter Biedermann, Lyss (CH); and Peter Spatz, Bern (CH)
Assigned to RUAG Ammotec AG, Thun (CH)
Appl. No. 18/248,985
Filed by RUAG Ammotec AG, Thun (CH)
PCT Filed Jul. 1, 2021, PCT No. PCT/EP2021/068248
§ 371(c)(1), (2) Date Apr. 13, 2023,
PCT Pub. No. WO2022/078639, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 102020127053.4 (DE), filed on Oct. 14, 2020.
Prior Publication US 2023/0384065 A1, Nov. 30, 2023
Int. Cl. F42B 5/36 (2006.01); F42B 5/285 (2006.01)
CPC F42B 5/36 (2013.01) [F42B 5/285 (2013.01)] 19 Claims
OG exemplary drawing
 
19. A method of manufacturing a bottom piece of a cartridge case, comprising:
performing a cold forming process on a metal blank to form a hollow casing section closed at a rear side by an ignition surface;
forming a bottom flange on an exterior of the hollow casing section;
pressing on an inside surface of the hollow casing section to form a cone section, wherein the cone section expands in a tulip or flower-like manner and has a cone-shaped inner contour; and
pressing the cone-shaped inner contour to form: a recess configured to receive a casing sleeve of the cartridge case, and a receiving chamber configured to receive an ignition charge.