Plastic sheets for use in protecting openings in walled structures

  • US 6,974,622 B2
  • Filed: 01/16/2003
  • Issued: 12/13/2005
  • Est. Priority Date: 01/16/2002
  • Status: Expired due to Fees
First Claim
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1. A plurality of corrugated plastic sheets comprising a first corrugated sheet and a second corrugated sheet, each corrugated sheet comprising an intermediate corrugated region and a pair of lateral corrugated regions disposed on opposite sides of said intermediate corrugated region, wherein:

  • said intermediate corrugated region comprises at least one substantially planar mounting region and at least one inclined intermediate region projecting away from said planar mounting region in the direction of an adjacent corrugation; and

    said pair of lateral corrugated regions comprise lateral corrugations along lateral edges of said sheet, each of said lateral corrugations having a substantially planar mounting region, an intermediate inclined region projecting away from said planar mounting region in the direction of an adjacent corrugation, and a lateral inclined region projecting away from said mounting region in the direction of one of said lateral edges;

    said corrugated region and said lateral corrugated regions are configured such that said sheet can resist a missile weighing about 9.4 lbs (4.3 kgs), having a cross-sectional impact area of about 5.25 in2 (34 cm2), and impacting said sheet at a velocity of about 50 ft/s (15.24 m/s);

    said lateral inclined region of one of said lateral corrugations of said second sheet overlaps said intermediate inclined region of one of said lateral corrugations of said first sheet for at least a majority of the cross-sectional extent of said intermediate inclined region;

    said planar mounting region of said lateral corrugation of said second sheet overlaps said planar mounting region of said lateral corrugation of said first sheet;

    said intermediate inclined region of said lateral corrugation of said second sheet overlaps said lateral inclined region of said lateral corrugation of said first sheet for at least a majority of the cross-sectional extent of said intermediate inclined region; and

    said lateral corrugations and said corrugations adjacent thereto define corrugations of substantially the same size and geometry.

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