Static discharge disc

Details Static discharge disc Static discharge disc

1979-11-20

1981-12-29

Nelson, Peter A.

Ammunition and explosives

Igniting devices and systems

Accidental fuse ignition prevention means

1022028, F42B 318

Patent

active

043076637

ABSTRACT:
Electroexplosive device and static discharge element therefor. The electroexplosive device herein has a cylindrical metallic casing which is open at one end and closed at the other end, a bridge element and lead wires therefor, a static discharge disc surrounding the lead wires for preventing accidental ignition due to static electricity, and a ferrite sleeve surrounding the lead wires to prevent accidental initiation due to radio frequency currents. The static discharge element comprises a nonconductive circular substrate having a slotted opening for the lead wires, and a conductive coating layer on at least one face of the substrate to conduct electricity from the leads to the casing in the event of electrostatic discharge. This conductive layer should be in electrical contact with the casing but not with the lead wires; to that end the substrate is left uncoated in the immediate vicinity of the opening. The ferrite sleeve is in electrical contact with the casing through a solder layer but is electrically insulated from the lead wires by a nonconductive thermal plastic material.

REFERENCES:
patent: 2086532 (1935-10-01), Burrows
patent: 2977878 (1961-04-01), Kinkel et al.
patent: 3180263 (1965-04-01), Williams, Jr.
patent: 3333538 (1967-08-01), Schnettler
patent: 3420174 (1969-01-01), Potter
patent: 3426682 (1969-02-01), Corren et al.
patent: 3683811 (1972-08-01), Driscoll
patent: 3753403 (1973-08-01), Menichelli
patent: 3789762 (1974-02-01), Petrick
patent: 3971320 (1976-07-01), Lee
patent: 3988989 (1976-11-01), Shea
patent: 3999484 (1976-12-01), Evans

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