Ammunition and explosives – Blasting – Patterned blasting
Patent
1990-02-22
1991-05-14
Nelson, Peter A.
Ammunition and explosives
Blasting
Patterned blasting
102313, 102215, 102217, F42B 300
Patent
active
050146220
ABSTRACT:
An explosive device receives signals specifying a unique communications address for use in a blasting circuit and a required blasting delay. The device has an electric igniter, but no independent power source which might cause accidental detonation. In an address and delay setting mode, when the device is being handled by a blaster, a unipolar signal is transmitted to the device to charge only a control power supply for general communications. In a blasting mode, a bipolar signal is transmitted to charge both control and igniter power supplies. A security code must, however, be transmitted to enable charging of the igniter power supply. Prior to detonation, each explosive device in a blasting circuit responds to a calibration signal by generating a timing circuit test count. A blasting machine processes nominal delays and test counts, and transmits adjusted delays to synchronize operation. A firing signal is recognized only if it contains a predetermined number of coded components thereby providing immunity to electromagnetic noise. The device is safely removed from a blasting circuit by transmitting a disarming signal which causes its igniter power supply to be discharged.
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