Sealing device for double glazed window assembly

Claim 1

In combination, a sealed double glazed window assembly comprising a pair of glass sheets arranged in spaced parallel relationship to form an air space therebetween and a spacing unit disposed between the inner marginal edges of the glass sheets, said spacing unit having an inner face and outer face, each said face having a hole registry with one another, said holes being providing the injection of a as into said space; and a sealing device comprising: a flexible plug adapted to fit into said holes; said plug defining a hollow cavity having an open end terminating at said outer face of said unit; and a blind rivet having a portion extending within said cavity of said plug, said rivet comprising a) a deformable sleeve member received in said cavity; b) a stem coaxially positioned within said sleeve member, said stem having, at one end thereof, an enlarged head portion positioned inside said cavity below said sleeve member and having an outer diameter greater than that of said sleeve member; said stem having a frangible neck of reduced size inside said cavity; said stem having a portion extending outside said plug; said sleeve member being deformed by an outward pulling action, exerted on said outside portion of said stem whereby said enlarged head portion is forcibly engaged in said sleeve member and deforms said sleeve member to expand said plug in said hole of said spacing unit to thereby sealingly contain the gas injected between the glass sheets.