ENCAPSULATED CASE FOR SMALL-ARMS WEAPON Russian patent published in 2017 - IPC F42B5/26 F42C19/10 

FIELD: weapons and ammunition.

SUBSTANCE: case has a central opening in the bottom of the capsule slots and annular groove on the periphery of the bottom of the capsule nest with the primer pressed into it, consisting of a metal cup with a pressed into it igniter composition percussion coated sealing membrane instead of trilobal anvil applied metal bead adjacent to one side of the sealing membrane and the other - to the bottom jack sleeve capsule and placed inside the central part of such diameter, so that the bead is recessed in the metal capsule slot end cap sleeve relative to the magnitude of the "D" equal to the value "C" maximum height igniter composition with a sealing membrane within a tolerance, the value plus the thickness of the wall of the metal cap and plus by the amount of "H", given on the cartridge along the recess of the primer-igniter relative to the end of the cap of the case, subject to tolerance. The "A" value of cap well depth is equal to the "B" value of the metal cap height within a tolerance plus the "H" value defined according to the recess of the cap primer with respect to the cap head end within the tolerance. So, the formulas should be implemented: "A" = "B" + "H" and "D" = "C" + "H". In this case, the inner surface of the central opening in the bottom of the capsule socket, three symmetrically arranged circumferentially undercuts are placed for flow of detonation products percussion igniter composition to the powder charge.

EFFECT: increased reliability and sensitivity of the cap primer triggering.

3 cl, 1 dwg