Abstract: A scraper and scrubber includes a hollow, elongated cylindrical body having an outer surface; a plurality of parallel, circumferentially spaced, V-shaped channels having a first depth extending in the longitudinal direction on the outer surface to form a plurality of parallel, circumferentially spaced ridges extending in the longitudinal direction on the outer surface between adjacent channels; a plurality of V-shaped helical grooves having a second, smaller depth extending at an acute angle to the channels and intersecting the ridges to form pointed, substantially pyramid shaped structures on the ridges, the substantially pyramid shaped structures formed on each ridge being offset with respect to the substantially pyramid shaped structures formed on adjacent ridges.

Abstract: A multifunction solar window and venetian blind is disclosed which is both functional and decorative. The disclosed structure includes a combination of a double-glazed window or door provided with a plurality of solar thermal energy absorbing slats rotatably installed intermediate the glass panes of said window. The slats have at least one surface constructed for absorbing solar thermal energy, and may be rotated to face either surface toward the exterior of dwelling in which the window may be installed. A plurality of apertures through the frame above and below the glass surfaces may be selectively opened and closed, in desired combinations, to provide open pathways through which air may flow into and out of the space between the glass surfaces. The slats in this space may transfer their heat to this air which may, by selective opening of said apertures, be used to heat or ventilate the interior of the dwelling.