Deflectable conductive gasket with environmental seal
A deflectable gasket assembly for EMI shielding and environmental sealing is described. The gasket assembly is formed from an electrically-conductive mesh sheet positioned between adjacent conductive surfaces. A gasket is provided at the outer boundaries of the mesh sheet for environmental protection. The edge of the gasket has a branched sealing element extending above and below the gasket assembly for contacting the adjacent surfaces. The branched sealing element is deformable and can be used on external aircraft electronic components.
1. An EMI and corrosion resistant assembly comprising
a first conductive surface comprising an external aircraft component surface;
a second conductive surface spaced apart from the first conductive surface, and comprising a second external aircraft surface; and
a composite gasket interposed and in electrical contact with the first and second conductive surfaces, wherein the composite gasket comprises
a resilient, electrically-conductive mesh sheet extending along an x-axis and a y-axis, axis, mesh sheet being adapted for electrical contact between adjacent first and second conductive surfaces;
a gel matrix material applied to the mesh sheet; and
a non-conductive chemically resistant elastomer affixed to the outer periphery of said mesh sheet, extending along the x-axis and y-axis; an end portion of said elastomer comprising a branched sealing element having a first branch portion and a second branch portion extending above and below the mesh sheet respectively, along a z-axis beyond the x-y plane of the mesh sheet, for contacting the adjacent conductive first and second surfaces, said branched sealing element being deformable along the z-axis.
2. The assembly of claim 1 which is at least part of an external aircraft electronic component.
3. The assembly of claim 2 , wherein the branched sealing element is in the shape of a forked element.
4. The assembly of claim 1 which is an external aircraft antenna.
5. The assembly of claim 4 wherein the branched sealing element is in the shape of a fillet conforming to the aerodynamic shape of an external aircraft electronic component.
6. The assembly of claim 1 wherein the mesh sheet is corrugated.
7. The assembly of claim 1 wherein the mesh sheet comprises one or more electrically-conductive fibers.
8. The assembly of claim 7 wherein the electrically-conductive fibers are non-conductive fibers having an electrically-conductive coating, metal wires, carbon fibers, graphite fibers, inherently-conductive polymer fibers, or a combination thereof.
9. The assembly of claim 7 wherein:
the non-conductive fibers are cotton, wool, silk, cellulose, polyester, polyamide, nylon, polyimide, or a combination thereof, and the electrically-conductive coating is copper, nickel, silver, aluminum, tin, carbon, graphite, or an alloy or combination thereof; and
the metal wires are copper, nickel, silver, aluminum, bronze, steel, tin, or an alloy or combination thereof, or one or more of copper, nickel, silver, aluminum, bronze, steel, tin, or an alloy or combination thereof coated with one or more of copper, nickel, silver, aluminum, bronze, steel, tin, or an alloy or combination thereof.