Forming element and forming apparatus for casting manhole inverts
Patent 4484724 Issued on November 27, 1984. Estimated Expiration Date: 
December 22, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 22, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 725098 1145228 1560811 Composite construction form system Full height sewer system manhole invert form assembly with angularly adjustable intersecting flow path Method of site casting tunnels, culverts, pressure pipes with minimum forming Method and apparatus for forming manhole bases Patent #: 4318880 InventorApplicationNo. 06/452199 filed on 12/22/1982US Classes:249/11, Culvert, waterway, pipe, or tunnel249/145, Plural intersecting cores to produce product having intersecting passages249/151, Core slidably removably engaging a hole in the wall of the molding device249/184Of plural sectionsExaminersPrimary: Czaja, Donald E.Assistant: Becker, Mary A. Attorney, Agent or FirmInternational ClassesF16L 43/00 (20060101)F16L 45/00 (20060101) AbstractApparatus for forming inverts in manhole floors between angularly-related pipeline sections includes a set of a plurality of wedge-shaped forming elements each having a molding surface of corresponding compound longitudinal and transverse arcuate curvature, the forming elements being of respectively varying longitudinally arcuate extents and being adapted for longitudinal end-to-end joinder for producing a variety of angular curvatures. The forming apparatus is set-up in the manhole between the pipeline sections with the molding surface downwardly facing and concrete is poured about the apparatus, the concrete thereby setting in conformity with the apparatus' molding surface to create a curvilinear invert between the pipeline sections.Other References
Field of SearchCulvert, waterway, pipe, or tunnelWITH STATIC GAGE, LEVEL, PLUMB, OR SCALE MARKINGS, ETC., ON MOLDING APPARATUS Having inner and outer shells forming conduit-type product, receptacle-type product, or module Plural intersecting cores to produce product having intersecting passages CORE (INTERNAL MOLD) Plural spaced cores having community feature Core slidably removably engaging a hole in the wall of the molding device Including means for attaching core to a support Of plural sections | |
