ELECTRIC DETONATOR Russian patent published in 1995 - IPC

FIELD: blasting operations; safe blasting means. SUBSTANCE: electric detonator has body 1, electric primer 4, initiating unit 5. initiated charge of secondary explosive. Initiated charge consists of charge 2 of pressed secondary explosive of high density and charge 3 of powder secondary explosive. Initiating unit 5 is made in form of caps placed in each other and rigidly fixed to each other and having holes in their end faces. Located between caps is a portion of loose secondary explosive. Located in cap end facing initiated explosive is calibrated membrane, and located in cap end facing electric primer is valve made in form of disk having radial channels with hollows on ends. and filled with combustible varnish. Valve is made of polyethylene, and caps are fixed relative to each other by rolling of protruding part of mouth of one cap in end surface of the other cap. EFFECT: higher reliability of operation of electric detonator. 3 cl, 4 dwg