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Composite pane having a high resistance to impacts

  • US 4,321,777 A
  • Filed: 01/28/1980
  • Issued: 03/30/1982
  • Est. Priority Date: 01/23/1979
  • Status: Expired due to Term
First Claim
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1. In a composite window pane specifically designed to resist impacts such as impacts from projectiles fired from fire-arms, comprising two sheets of glass in substantially parallel planes, at least one transparent sheet of polycarbonate which resists impacts and is interposed between the two sheets of glass and is in a plane substantially parallel to said planes;

  • the improvement comprising a film of a transparent liquid between each face of said sheet of polycarbonate and the adjacent one of said sheets of glass, and flexible sealing means comprising a U-section frame which extends around the pane to constitute an outer sealing element, said U-section frame comprising two annular outer flanges which are adhered against outer faces of said sheets of glass, and two peripheral annular portions which project inwardly of the frame and are respectfully sealingly engaged between marginal portions of the sheet of polycarbonate and marginal portions of said sheets of glass and allow relative movements between said sheet of polycarbonate and said sheets of glass in said substantially parallel planes, said frame being adhered only to said sheets of glass and not to said sheet of polycarbonate.

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