BLAST CHARGE Russian patent published in 2015 - IPC F42B3/08 F42B1/02 

FIELD: blasting jobs.

SUBSTANCE: blast charge comprises electric fuse, extra fuse and explosive charge with axial channel arranged in the length to decompose said explosive matter at overcompacted detonation mode from electric fuse and extra fuse. Axial channel in explosive charge is composed of even number of shaped recesses symmetric relative to each other to make intersecting axially symmetric elliptical shapes in height 1.1-2 times greater than the width and to compose two focal distances symmetric about shaped recesses. Extra fuse is arranged nearby the explosive charge end and shaped thereto and can perform the point initiation at its centre. Explosive charge axial channel accommodates the explosive insert arranged opposite said extra fuse explosive charge end. Said insert is shaped to explosive charge axial channel cross-section with extending part to be coupled with similar blast charge.

EFFECT: higher blast fragmentation.

2 dwg, 1 tbl