CARTRIDGE FOR COMMERCIAL EXPLOSIVE Russian patent published in 1997 - IPC

FIELD: drilling and blasting operations in gas- and dust-dangerous mines. SUBSTANCE: cartridge uses a cylindrical polyethylene envelope with a blind bottom, whose inlet is furnished with a cover and annular corrugations for joint with another cartridge so as to make up a single charge of several cartridges. The envelope bottom section is furnished with annular corrugations to be found on the cylindrical surface, corresponding to the annular corrugations at the envelope inlet, and with a cylindrical groove by the depth of the envelope wall. The envelope inlet up to the first corrugation is furnished with an annular shell, whose inside diameter and length equal the outside diameter and length of the groove in the envelope bottom section, respectively. EFFECT: enhanced efficiency. 2 cl, 2 dwg