F - Mech Eng,Light,Heat,Weapons – 42 – D
Patent
F - Mech Eng,Light,Heat,Weapons
42
D
317/5.9
F42D 1/04 (2006.01) F42D 1/05 (2006.01)
Patent
CA 1093631
ABSTRACT OF THE DISCLOSURE A method for the initiation of a number of electric detonators by means of a blasting machine of the type in which a capacitor is charged, in which level-sensing units measure the level of the charge, and where the detonators are initiated by the electric energy stored in the capacitor being supplied to the detonators, either by means of automatic firing at the in- tended charge level or through manual firing after indication that the intended charge level has been attained. According to the method, the charge level of the capacitor in connection with firing is in a limited range which follows the variations of the load between different initiation occasions in such a way, that the current impulse provided to each detonator assumes a value between a minimum and a maximum limit, and where the limits for each individual case of load within the operating range of the apparatus are adapted to suit the electrical and other physical characteristics of the detonators, so that safe initiation and a disturbance-free firing process are obtained.
278556
Gustafsson Ake
Westberg Jan
Nitro Nobel Ab
Swabey Ogilvy Renault
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