초록 ▼

Disclosed is a method for delineating zones on the surface of thermoplastic gratings. The method comprises inserting in the grate openings a removable closure member adapted to interlock with the grating and close the opening. The removable closure member is distinguishable from the grating in color

Disclosed is a method for delineating zones on the surface of thermoplastic gratings. The method comprises inserting in the grate openings a removable closure member adapted to interlock with the grating and close the opening. The removable closure member is distinguishable from the grating in color and when a plurality of closure members are so inserted in a pattern, they delineate a given zone.

대표청구항 ▼

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 be

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.