Delay type electric detonator
First Claim
1. A delay type electric detonator comprising:
- a pair of leg wires which are connectable to a bus wire connected to an electric blaster;
a delay circuit connected across the leg wires and generating at an output terminal an igniting current at a predetermined time;
an igniting resistor connected across the output of the delay circuit and one of the leg wires, and igniting the detonator when said igniting current passes through the igniting resistor; and
by-pass means connected between the other of the leg wires and the igniting resistor and conducting a measuring current through the igniting resistor, said measuring current being smaller than said igniting current;
whereby a terminal voltage generated across the igniting resistor by flowing the measuring current through the igniting resistor is measurable from the exterior of the detonator.
1 Assignment
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Accused Products
Abstract
An electric detonator of the delay type including a housing having a metal portion and an insulating portion, a pair of leg wires extending outside through the housing, a delay circuit connected across the leg wires and generating an ignition current at a predetermined timing, and an igniting resistor connected to an output terminal of the delay circuit and one of the leg wires. In order to check the resistance value of the igniting resistor even after the detonator has been assembled, a by-pass resistor is connected between the other of the leg wires and a junction point between the delay circuit and the igniting resistor. A small measuring current is conducted through the igniting resistor via the by-pass resistor to generate a voltage drop across the igniting resistor. This voltage drop is measured by connecting a voltage measuring device between the leg wire and the metal portion of the housing.
13 Citations
10 Claims
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1. A delay type electric detonator comprising:
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a pair of leg wires which are connectable to a bus wire connected to an electric blaster; a delay circuit connected across the leg wires and generating at an output terminal an igniting current at a predetermined time; an igniting resistor connected across the output of the delay circuit and one of the leg wires, and igniting the detonator when said igniting current passes through the igniting resistor; and by-pass means connected between the other of the leg wires and the igniting resistor and conducting a measuring current through the igniting resistor, said measuring current being smaller than said igniting current; whereby a terminal voltage generated across the igniting resistor by flowing the measuring current through the igniting resistor is measurable from the exterior of the detonator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification