Delay circuit for electric blasting, detonating primer having de

Details Delay circuit for electric blasting, detonating primer having de Delay circuit for electric blasting, detonating primer having de

1987-09-17

1989-05-02

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

102200, 102217, F42C 1106, F42D 106

Patent

active

048257656

ABSTRACT:
A delay type electric detonating primer for use in a multiple-step blasting system including a capacitor for storing electric changes supplied from an electric blaster via bus wires and leg wires, an actuation circuit connected across the capacitor for generating an actuation signal when an energy supply from the electric blaster is stopped, a clock pulse generating circuit having a crystal oscillator and being energized with energy stored in the capacitor to produce clock pulses, a counting circuit which is initiated to count the clock pulses in response to the actuation signal, and generates an ignition signal when the counter has counted the predetermined number of clock pulses, and a switching circuit for discharging electric charges stored in the capacitor through an igniting resistor in response to the ignition signal.

REFERENCES:
patent: 3834310 (1974-09-01), Ueda et al.
patent: 4044681 (1977-08-01), deMere
patent: 4145970 (1979-03-01), Hedberg et al.
patent: 4409897 (1983-10-01), Kirby et al.
patent: 4445435 (1984-05-01), Oswald
patent: 4487125 (1984-12-01), Zuk
patent: 4601243 (1986-07-01), Ueda et al.
patent: 4615268 (1986-10-01), Nakano et al.

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