Priming device for blasting compositions

Claim 1

IN A COMPOSITE PRIMING DEVICE ESPECIALLY ADAPTED FOR INITIATING DETONATIVE BALSTING COMPOSITIONS AND HAVING A CAST CYLINDRICAL BODY OF COMMERCIAL DETONATING FUSEINSENSITIVE AND CAP-INSENSITIVE EXPLOSIVE, THE IMPROVEMENT COMPRISING (A) A WATER-IMPERVIOUS LONGITUDINAL PRESSURE-RESISTANT METALLIC TUBE DISPOSED COAXIALLY WITHIN THE CAST CYLINDRICAL BODY, SAID TUBE BEING OF SMALL DIAMETER AND CONTAINING FROM ABOUT 2 TO ABOUT 5 GRAMS OF A CHARGE OF COMMERCIAL DETONATING FUSE-SENSITIVE AND CAP-SENSITIVE CRYSTALLINE HIGH EXPLOSIVE PRESSED TO AN AVERAGE CHARGING DENSITY OF ABOUT 1945 GRAMS PR CC., (B) TWO CONDUITS OPPOSITELY SPACED FROM EACH OTHER AND JUXTAPOSED WITH THE TUBE, ONE OF SAID CONDUITS EXTENDING ENTIRELY THROUGH THE CAST CYLINDRICAL BODY AND HAVING A DIAMETER SUCH AS TO ACCOMMODATE A COMMERCIAL DETONATING FUSE, THE OTHER OF SAID CONDUITS BEING A CAP CONDUIT EXTENDING PARTLY THROUGH THE CAST CYLINDRICAL BODY AND HAVING A DIAMETER BLASTLENGTH SUCH AS TO ACCOMMODATE A COMMERCIAL BLASTING CAP, AND (C) THE TUBE BEING POSITIONED ON ONE SIDE OF THE CONDUITS ONLY WITH ITS LENGTH EXTENDING THEREBETWEEN AND ADJACENT THERETO SO THAT UPON INSERTION OF A COMMERCIAL BLASTING CAP INTO THE CAP CONDUIT THE CAP AND THE SAID TUBE ARE SUBSTANTIALLY COEXTENSIVE.