Abstract: An apparatus and method for roughing surfaces and edges of concrete casted blocks, comprising a block support surface having a plurality of surface sections. A first of the surface sections has a rear end thereof above an adjacent front end of a second of the surface sections to create a ledge for projecting a leading edge portion of concrete blocks conveyed over the first surface section. A first roughing device has a plurality of impacting elements thereon for roughing concrete blocks. The first roughing device is disposed generally above the rear end of the first surface section for abrading a projecting leading edge portion of each concrete block as they are conveyed over the rear end. A conveyor displaces concrete blocks over the first and second surface sections, the blocks being tilted when reaching a predetermined position over the ledge to avoid being abraded by the roughing device.

Abstract: An apparatus and method for roughing surfaces of concrete casted blocks are provided. A horizontally disposed surface roughing device, having impacting elements secured thereto, is driven to impact on blocks supported thereunder on a support table. The support table has a flat support upper surface. Block tilt support pins project from the upper surface at predetermined locations for supporting some of the blocks tilted at a predetermined angle. The block tilt support pins are displaceable from a retracted position below the upper surface to a projecting block tilting position above the upper surface. A displacement mechanism imparts translationary displacement between the impacting elements and the support table to abrade the blocks.

Abstract: A pre-cast cobblestone (10) is comprised of a concrete body (11) of substantially rectangular outline and having a top and bottom wall (13-14) and opposed side walls (15). The top wall (13) is embossed and the side walls (15) have longitudinally shaped flat side surfaces (15'). At least two of the side walls have spaced-apart protruding sections (16-17, 18-19) of irregular transverse cross-section which are aligned with straight intersecting outer parallel axes (12-12') of the side walls. The side walls (15) also have recessed sections (19) of irregular transverse cross-section defined between the protruding sections.