A plastic tile with interlocking projections

Claim 2

A tile according to claim 1 further including a plurality of upstanding ribs extending along the upper surface of the watershed portion between the front and rear walls, one end rib being near but not at one of the side edges and cooperating with an overlapping side edge of an adjacent tile.

Claim 3

A tile formed from resin-based plastics material containing both filler materials and reinforcing fibers, the configuration of the tile including a depending front wall, an upstanding rear wall, and a watershed portion joining the walls, a rear wall projection extending forwardly of the upstanding rear wall provided with an interlocking surface disposed upwardly from the watershed portion and defining therewith a recess, a front wall projection extending rearwardly from the rear face of the front wall being provided with an interlocking surface spaced downwardly from the watershed portion and definiNg therewith a further recess, the front wall projection being complementary in shape to the recess beneath the rear wall projection and the rear wall projection being complementary in shape to the recess above the front wall projection, said interlocking surfaces being inclined relative to the watershed portion and being substantially parallel to one another, the said projections having their interengaging surfaces inclined to the general plane of the watershed, so constructed and arranged that no reentrant angles exist between surfaces thereof, and further comprising a flange extending rearwardly from the upper edge of the rear wall.