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Method of zoning grate surfaces

  • US 4,296,160 A
  • Filed: 01/07/1980
  • Issued: 10/20/1981
  • Est. Priority Date: 01/07/1980
  • Status: Expired due to Term
First Claim
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1. A method of delineating a zone on a surface of a thermoplastic grating, said grating comprising a molded thermoplastic sheet of a first color having an upper surface and a lower surface, a plurality of support legs on the lower surface and a plurality of square openings in the sheet communicating between upper and lower surfaces, the sheet portions between said square holes being bars defining the edges of adjacent holes, which comprises;

  • inserting in those openings within said zone a removable closure member adapted to interlock with the grating and close the openings, said member having a second color which is visually distinguishable from the first color, said member comprising a cylinder having a first closed end and a second end, and expanded flange portions on each of said first and second ends, said flange portions flaring toward the mid-section of the cylinder shaped member, said interlocking occurring when the flanges frictionally engage the bars.

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