Ammunition and explosives – Igniting devices and systems – Ignition or detonation circuit
Patent
1979-05-14
1982-02-09
Jordan, Charles T.
Ammunition and explosives
Igniting devices and systems
Ignition or detonation circuit
361249, F42C 1106, F42D 100
Patent
active
043145078
ABSTRACT:
A circuit for use in the sequential initiation of explosives comprises an up-down counter having a first input terminal at which an up-count is initiated, a second input terminal at which a downcount is initiated, and an output terminal, an energy storage capacitor for powering the counter, a first resistor which has a low impedance for a fixed time to current of a particular value and of a first polarity and which thereafter has a high impedance connected to one of the input terminals of the counter so that when current of the first polarity and of the particular value is passed through the first resistor a signal is applied after the fixed time to the input terminal to initiate a count in an up direction, and a second resistor which has a low impedance to a predetermined voltage of a given polarity connected to the other input terminal of the counter so that when the predetermined voltage of the given polarity is applied to the second resistor a count is initiated in a down direction, the counter generating an output signal at its output terminal for actuating a detonator when the count in the down direction reaches zero.
REFERENCES:
patent: 3312869 (1967-04-01), Werner
patent: 3468255 (1969-09-01), Stryker, Jr.
patent: 3571605 (1971-03-01), Dobson et al.
AECI Limited
Jordan Charles T.
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