F - Mech Eng,Light,Heat,Weapons – 42 – C
Patent
F - Mech Eng,Light,Heat,Weapons
42
C
327/119, 102/32
F42C 15/40 (2006.01) F42B 3/188 (2006.01)
Patent
CA 1206805
TITLE Electric Initiator Resistant to Actuation by Radio Frequency and Electrostatic Energies ABSTRACT OF THE DISCLOSURE 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.
441174
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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