Ammunition and explosives – Igniting devices and systems
Patent
1974-04-16
1976-04-13
Pendegrass, Verlin R.
Ammunition and explosives
Igniting devices and systems
86 20C, F42B 300
Patent
active
039496732
ABSTRACT:
A blasting charge, e.g., for pre-splitting, easy to load into boreholes and to maintain in wet boreholes when the charge density is low, comprising an elongated sinuous length of semi-rigid tubing, e.g., polyethylene, laden with explosive, e.g., a water-bearing explosive, the charge having sufficient rigidity that when unwound from a coil and fed into a borehole it retains a degree of curvature and exerts pressure against the wall of the borehole. Loading explosive into a borehole by unwinding a coiled length of semi-rigid explosive-laden tubing and feeding the tubing into the hole, the leading end of the tubing being provided with explosives-retaining means, e.g., a 180.degree. bend in the tubing together with a sleeve fitting over the bent portion of the tubing.
REFERENCES:
patent: 2755878 (1956-07-01), Smith
patent: 3273337 (1966-09-01), Bolieau
patent: 3318242 (1967-05-01), Griffith
patent: 3384688 (1968-05-01), Gow et al.
patent: 3534685 (1970-10-01), Romocki et al.
patent: 3590739 (1971-07-01), Persson
patent: 3610089 (1971-10-01), Cook et al.
patent: 3691954 (1972-09-01), Kern
patent: 3793954 (1974-02-01), Johnston
E. I. DuPont de Nemours and Company
Pendegrass Verlin R.
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