Title: Cellular floor, wall or the like structure

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Abstract: An improved cellular floor, wall or the like structure is disclosed. The structure in a specific embodiment disclosed, includes a covered raceway for electrical conductors. The raceway has a plurality of knockouts in its cover, and is covered by and at least partially supports a poured concrete floor. The improvement is a plurality of cooperating piston-cylinder assemblies on the raceway cover. Each of the assemblies is a cylinder with a concrete piston therewithin. The cylinder is positioned so that its projection on the raceway cover is larger than and covers one of the knockouts. The piston is capable of limited axial movement within the cylinder, and has an end in substantial contact with one of the knockouts. The piston end is of such size and shape that, when driven toward the knockout, the piston will drive the knockout into the raceway and enter the knockout opening. The piston expands in cross-sectional size away from the end to a size sufficiently large to prevent the piston from going completely through the knockout opening. The piston is a part of and integral with the concrete floor of the structure.


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