Machine for surface treatment of concrete panels or sections

Machine for surface treatment of horizontally cast concrete units, such as walls, partitions, and floor decks, which are used in the erection of prefabricated houses and which are cast in mold frames having lateral boundaries, the top edges of which are flush with the upper surface of the concrete unit, the finishing being performed while the units rest in their mold frames, comprising a horizontal rectangular framework, opposed vertical supports on opposite sides of said framework, wheels mounted on said opposed vertical supports for guiding said framework for movement along parallel longitudinal tracks disposed under each of said opposed vertical supports, vertically adjustable transverse support means extending between said vertical supports, a plurality of pairs of rollers, the rollers of each pair being mounted at opposite ends of said vertically adjustable transverse support means, a plurality of parallel endless belts, each of said belts passing over one of said pairs of rollers, means mounted on said machine for driving said belts in mutually opposite directions, a mold frame mounted beneath said horizontal framework for containing a cast concrete unit to be finished, sides on said mold frame parallel to said vertical supports, said mold frame sides having a width greater than the cast concrete unit, each said belt having a lower run and an upper run, said lower run spanning at least the entire width between said mold frame sides and overlying the surface of the cast concrete unit, a plurality of support plate means mounted on said framework, each of said support plate means positioned above and in contact with the lower run of an endless belt to direct the respective said belt downward against the surface of the cast concrete unit, and separately driven means connected to each of said support plate means for vibrating the respective support plate means substantially perpendicular to the surface of the cast concrete unit.