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OwnerJames C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher, Vincent J. Menichelliinventors
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An improved electroexplosive device employs a header having contact pins hermetically sealed with glass passing through from a connector end of the header to a cavity filled with a shunt layer of a new nonlinear resistive composition and a heat-sink layer of a new dielectric composition having good thermal conductivity and capacity. A bridge circuit placed across the contact pins in contact with the heat-sink layer is welded to the pins. The header is inserted into a body for the device and welded for a hermetic seal between the connector end and the bridge end. Layers of igniter and output charges are placed in the body over the heat-sink layer and bridge circuit. A closure disk is then placed over the charges and welded to the body to form a hermetic seal. The nonlinear resistive layer and the heat-sink layer are prepared from suitable comminuted materials by mixing with a low temperature polymerizing resin. The resin is dissolved in a suitable solvent and later evaporated. The resultant solid composite is ground into a powder, press formed into the header and cured (polymerized) at about 250.degree. to 300.degree. F.
In an electroexplosive device, a body having a passage and a header comprised of an insert having an external configuration matching said passage through said body such that said header will lodge in said passage at said one end leaving a space in said body for explosive materials to be loaded into said body behind said header, said insert having a cavity in the end thereof over which said explosive material is loaded, said header further comprising at least two electrical contact pins passing through said insert with ends of said pins protruding from said insert at said one end of said body passage, and with the other ends of said pins in said cavity of said insert flush with the cavity-end of said insert, a first layer of nonlinear resistive composition formed in said cavity of said insert in electrical contact with both pins, a second layer of thermal conductive dielectric composition over said layer of nonlinear resistive composition, and a bridgewire connected across the ends of said pins in thermal contact with said second layer over its full length between said contact pins.
The combination of claim 5 further including a keyed connector on said body around said contact pins protruding from said insert at said one end of said body.
Dependencies are inferred from the claim text.