When tilt-up building walls are designed to have decorative areas or bands (known as rustications) within the surfaces of the concrete wall panels, wooden recess forming strips commonly are attached to the forming surface in a predetermined pattern. It's not uncommon for the wood strips to be destroyed or damaged either when the cured panels are released from forms and lifted to vertical positions or when the strips are removed from the forming surface. As a result, the recess forming boards or strips aren't reusable, creating a recurring cost.
In order to eliminate this recurring cost, inventors Kurt S. Eyring and Kyozaburo Takagi of Centerville, Ohio, and Matthew Packer of West Carrollton, Ohio, have come up with an "Extruded Plastic Rustication Device for Forming Decorative Concrete Panels" that is capable of repeated use. Patented August 28, 2001 under U.S. Patent No. 6,279,868, the invention is assigned to Miller-Valentine Construction in Dayton, Ohio.
Besides its reusability, the device also may be cut to desired lengths and get mitered ends using conventional cutting tools, minimizing the need for fasteners such as screws and nails.
The device includes an elongated base clip member or channel of extruded semi-rigid plastic, which is designed to be screwed to a concrete floor or other forming surface. The base channel has side walls projecting up with opposing teeth projecting inward. The teeth engage other teeth that project on internal space support walls of the rustication member. Inclined end walls project outwardly and downwardly from the top wall and have lower tapered edges for engaging the forming surface to form recesses having beveled edge surfaces within the concrete panels. Vertical stem or parallel spaced support walls also project downward from the top wall and engage the forming surface.