Apparatus and procedure for forming pre-shaped interlocking cement slabs

Claim 1

An improved pour and mold cast-formed concrete slab of simplified construction that is contoured for use as one of a plurality of endwise interfitting-latching and aligned longitudinal progression of substantially planar slabs to provide a substantially sealed-off joined longitudinally extending side edging for a street or roadway to finish the side paving thereof along its berm which comprises, a non-laminated unitary rectangular-shaped slab body of cast-molded solidified cementitious material having a rough pour-finished roadway mounting under surface face and a smoothly mold-finished and contoured upper surface face, said upper surface face being defined by a pair of longitudinally extending substantially planar front and back upper face portions that slope laterally towards each other to define a substantially centrally-positioned longitudinally-extending drainage concavity along the slab, said planar back face portion defining a raised curb portion along and with said back side wall, said body having a pair of longitudinally extending depthwise-defined vertical front an back substantially parallel opposed side walls and a pair of laterally extending depthwise-defined smoothly finished vertical and substantially parallel opposed end walls, said one end wall of said pair having an outwardly projecting, smoothly finished ledge-like tongue portion horizontally therealong and spaced laterally inwardly from said upper and upper surface faces as well as longitudinally inwardly from said pair of front and back opposed side walls of said slab body, the other end wall of said pair having a smoothly finished shelf-like groove portion extending horizontally therealong that is complementary with said tongue portion and spaced laterally inwardly from said under and upper surface faces as well as longitudinally inwardly from said pair of front and back opposed side walls; said under surface face being roughly pour-formed as an upwardly exposed surface within the mold, and said upper surface face and said pair of opposite end walls being cast-formed and contoured with smoothly finished surfaces by inner walls of the mold.