초록 ▼

A chub cartridge has a tubular chamber containing a water-bearing blasting agent, and a longitudinal tunnel adjacent to the tubular chamber and integral therewith. Preferably, the tunnel is full-length and continuous and has holes for threading a detonating cord therethrough and for holding a cord f

A chub cartridge has a tubular chamber containing a water-bearing blasting agent, and a longitudinal tunnel adjacent to the tubular chamber and integral therewith. Preferably, the tunnel is full-length and continuous and has holes for threading a detonating cord therethrough and for holding a cord firmly against the tubular chamber for the cord-priming of the cartridges. In primer assemblies, the tunnel also can be used to hold a cap/booster in place, and for lacing cap wires or a low-energy detonating cord. A preferred cartridge is made continuously in a series by wrapping a web of film having a row of holes along one edge so as to form a tube and an outer flap containing the holes, and sealing the tube and the flap so as to form a tunnel containing the holes in its outer portion, the wrapping being performed so that either the inner or outer portion of the tunnel is circumferentially longer than the other.

대표청구항 ▼

A blasting cartridge of the chub type comprising a generally cylindrical body of plastic film gathered and closed at both ends and containing a water-bearing blasting agent, said generally cylindrical body comprising a web of film wrapped about a longitudinal axis and sealed continuously in the dire

A blasting cartridge of the chub type comprising a generally cylindrical body of plastic film gathered and closed at both ends and containing a water-bearing blasting agent, said generally cylindrical body comprising a web of film wrapped about a longitudinal axis and sealed continuously in the direction of said axis to form (a) a sealed, substantially tubular enclosure filled with said blasting agent, and (b) a flap portion, said flap portion being sealed longitudinally to form a tunnel adjacent to the substantially tubular enclosure on an axis parallel to the longitudinal axis of said enclosure, and said tunnel having a portion of its wall exposed to allow access to the tunnel without destroying the integrity of the tubular enclosure.