Static molds – Core – Including means for attaching core to a support
Reexamination Certificate
1999-10-14
2001-08-28
Nguyen, Nam (Department: 1722)
Static molds
Core
Including means for attaching core to a support
C249S035000, C249S187100
Reexamination Certificate
active
06279868
ABSTRACT:
BACKGROUND OF THE INVENTION
In the construction of commercial and industrial buildings of the type which has concrete wall panels formed by using the tilt-slab method, a concrete building floor is normally poured in place and is then coated with a release agent to form a horizontal forming surface for the wall panels. The forms for producing the concrete wall panels are then placed on the forming surface, and reinforcing steel or rebars are positioned within the forms. When concrete is poured within the forms, the top edges of the forms are used as a guide for a screed which forms the flat top surfaces of the wall panels. After the concrete wall panels are cured, they are lifted or tilted by a crane to vertical positions to form the outer walls of the building.
When it is desired to form decorative areas or bands, known as rustications, within the surfaces of the concrete wall panels, recess forming strips of wood are commonly attached to the forming surface in a predetermined pattern, and the strips are treated or sprayed with a concrete release agent. However, it is not uncommon for the wood strips to be destroyed or damaged either when the cured concrete wall panels are tilted from the forming surface to vertical positions, or when the strips are removed from the forming surface. As a result, the recess forming boards or strips cannot be reused.
SUMMARY OF THE INVENTION
The present invention is directed to an improved rustication device for forming decorative areas or recesses in concrete wall panels poured onto a concrete floor or other forming surface and which provides the desirable advantages of durability, reusability and economy of construction in addition to providing high quality and precision decorative recesses within the surfaces of the concrete panels. The rustication device of the invention may also be cut to desired lengths and with mitered ends using conventional cutting tools, minimizes the use of fasteners such and screws and nails, and requires no special coating or concrete release agent on the device.
In accordance with a preferred embodiment of the invention, a rustication device includes an elongated base clip member or channel of extruded semi-rigid plastics material and which is adapted to be secured by screws to a concrete floor or other forming surface. The base channel has upwardly projecting side walls with inwardly projecting and longitudinally extending opposing teeth. The teeth releasably engage outwardly projecting teeth on internal space support walls of a rustication member of extruded semi-rigid plastics material. Inclined end walls project outwardly and downwardly from the top wall of the rustication member and have lower tapered edge portions 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 downwardly from the top wall and engage the forming surface.
Other features and advantages of the invention will be apparent from the following description, the accompanying drawing and the appended claims.
REFERENCES:
patent: D. 428162 (2000-07-01), Eyring et al.
patent: 2021210 (1935-11-01), Thorn
patent: 3148433 (1964-09-01), Carriker
patent: 3632078 (1972-01-01), Dashew
patent: 4089502 (1978-05-01), Miller
patent: 4659057 (1987-04-01), Felter
Eyring Kurt S.
Packer Matthew
Takagi Kyozaburo
Heckenberg Donald
Jacox Meckstroth & Jenkins
Miller-Valentine Construction Inc.
Nguyen Nam
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