Electric initiator resistant to actuation by radio frequency and

Details Electric initiator resistant to actuation by radio frequency and Electric initiator resistant to actuation by radio frequency and

1982-11-15

1985-05-21

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Accidental fuse ignition prevention means

F42B 318

Patent

active

045178950

ABSTRACT:
An RF-filter for an electric blasting cap comprises, in sequence from the cap's bridgewire, a first series-wired inductance plug (e.g., one or more ferrite beads), a shunt-wired resistance slug (e.g., conductive silicone rubber), two series-wired resistors (e.g., 27 ohm) in parallel geometry, and a second series-wired inductance plug adjacent the sealing plug on the cap. The filter elements are sheathed in a heat-resistant insulating and supporting sleeve, and an electrostatic flashover point is provided between the sealing plug and the inductance plug. The filter affords RF protection of 25 db between 1 and 4000 MHz, and withstands high current or voltage surges over a wide temperature range without permanent impairment.

REFERENCES:
patent: 3264989 (1964-03-01), Rucker
patent: 3572247 (1971-03-01), Warshall

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