Patent ID: 7779581

Claim:
A replaceable, wet-set tactile warning surface unit, comprising: a body defining an upper surface and a lower surface, the body defining a series of raised projections on its upper surface, and defining one or more spaced through-holes from the upper surface to the lower surface, in which the raised projections are spaced from one another and the through-holes are located between projections; and a number of anchor members equal to the number of through-holes coupled to the lower surface of the unit member directly below the through-holes by an equal plurality of fasteners that pass through the through-holes; wherein the body defines a perimeter flange that is thicker than the rest of the body, a plurality of spaced slots passing from an exterior portion of the perimeter flange to an interior portion that allow air to escape from underneath the unit when it is installed in fresh concrete, and wherein the lower surface of the body surrounding each of the through-holes defines a downwardly-protruding lower projection.