Ammunition and explosives – Igniting devices and systems – Ignition or detonation circuit
Reexamination Certificate
1999-04-22
2001-07-17
Jordan, Charles T. (Department: 3641)
Ammunition and explosives
Igniting devices and systems
Ignition or detonation circuit
C102S218000, C102S214000, C102S200000, C102S248000, C102S202800
Reexamination Certificate
active
06260483
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention is an improvement in the system described in U.S. Pat. No. 4,576,093, issued Mar. 18, 1986, to the inventor of this invention, Richard N. Snyder. This patent is hereby incorporated by reference.
The above-mentioned patent describes a remote radio blasting system employing a radio transmitter controlled by a tone generating handset and a receiver receiving DTMF codes from the transmitter. The receiver decodes received DTMF codes to first arm and then fire a firing circuit, which electrically detonates blasting caps to cause the detonation of the explosives.
SUMMARY OF THE INVENTION
The system of the present invention employs a transmitter and receiver like that described in the above-identified patent. In the present invention, the receiver triggers a blocking oscillator which generates a high output voltage by means of a transformer. The high voltage output of the blocking oscillator is rectified and is used to charge a capacitor to a high voltage. The capacitor voltage is coupled by means of a coupling circuit to a plasma arc coupler which is designed to generate a high voltage arc. The capacitor will discharge through the arc in the plasma coupler showering explosive material in the end of a shock tube with electrons and molten metal atomic particles from the plasma coupler. The high voltage arc will ignite the explosive material in the end of the shock tube and the explosion will travel along the shock tube to the explosive device, which will then detonate. In this manner, the shock tube is ignited without the use of blasting caps or pyrotechnic initiators, thus eliminating a need for a volatile explosive ignition at the receiver.
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Aitken Richard L.
Jordan Charles T.
Semunegus Lulit
Venable
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