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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 s

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.

대표청구항 ▼

A delay circuit for use in electric blasting comprising: a capacitor for storing electric energy supplied from an energy supply source; an actuation circuit for detecting a stop of the supply of said electric energy from the energy supply source and for generating an actuation signal in response the

A delay circuit for use in electric blasting comprising: a capacitor for storing electric energy supplied from an energy supply source; an actuation circuit for detecting a stop of the supply of said electric energy from the energy supply source and for generating an actuation signal in response thereto; a clock pulse generating cirucit energized with energy stored in said capacitor for generating clock pulses; a counting circuit for initiating a counting of said clock pulses in response to said actuation signal and generating an ignition signal upon counting clock pulses the number of which is equal to a predetermined preset count value; and a switching circuit for discharging charges stored in said capacitor through an ignition circuit in response to said ignition signal.