FRAGMENTATION AMMUNITION CASING Russian patent published in 2011 - IPC F42B12/22 

FIELD: weapons and ammunition.

SUBSTANCE: casing of fragmentation ammunition includes cylindrical cover on inner surface of which there is fragmentation grid made from spiral and opposite-directed riffles having the depth of 0.25…0.55 of thickness of the cover wall and forming semi-finished fragments as per the shape of truncated pyramids conjugated with their rhomb-shaped bases, driving band and low-pressure chamber formed by means of bottom connection strap and open backwards in cone shank. Main diagonal of the bases of fragments is oriented relative to the cover within ±15°. Length of the above diagonal exceeds cover wall thickness by 1.5…2.5 times, and length of small diagonal by 1.4…2.0 times. Bottom connection strap on the cover side is equipped in addition with layer of semi-finished fragments formed with cavities with depth of 0.2…0.4 of thickness of bottom connection strap and as per the shape of many-sided pyramids the side edges of which are inclined relative to the plane of connection strap at an angle of 40°…50°. At that, bases have total surface area of not less than 0.22 of surface area of bottom connection strap. Low-pressure chamber has depth of not more than 1.5 of gauge and thickness of its side wall is not more than 0.35 of thickness of bottom connection strap.

EFFECT: increasing efficiency of fragmentation effect of the shell.

3 dwg