Static molds – Uniting preform with molding material – Including means other than mold surface to support preform
Patent
1989-01-30
1990-11-13
Housel, James C.
Static molds
Uniting preform with molding material
Including means other than mold surface to support preform
249 11, 249 12, 249158, 249159, 249171, 249194, B28B 704
Patent
active
049696262
ABSTRACT:
An adjustable culvert form facilitates fabrication of rectilinear culverts and skewed culverts that is, culverts having an angular relationship between sidewalls and span. It is particularly useful for the production of three-sided culverts. The form generally defines a parallelogram having low, vertically standing sidewalls which are interconnected at adjacent ends by hinges. The hinges may be either a conventional pair of interleaved pivots coupled by a removable pin or a unique expandable, multiple pin hinge configuration. The form is placed on a smooth horizontal surface such as a previously poured concrete slab, the surface forming the largest continuous surface of the product. The culvert is cast in an inverted orientation. The width and length of the formed product may be adjusted by the incorporation or removal of sidewall panels. Triangular sidewall panels are secured to end adjacent regions of the sidewall panels to form haunches. The walls (legs) of the culvert are formed by square or correspondingly skewed wall forms extending upwardly from the haunch panels. Various inserts may be attached to the form to mold in-situ such features as key or rail securement sites.
REFERENCES:
patent: 1049436 (1913-01-01), Woolf
patent: 1384514 (1921-07-01), Close
patent: 1407246 (1922-02-01), Bond
patent: 1461973 (1923-07-01), De La Mare
patent: 3685783 (1972-08-01), Hilson
patent: 3825220 (1974-07-01), Schmaltz
patent: 4055321 (1977-10-01), Schimmel
patent: 4564313 (1986-01-01), Niswander et al.
patent: 4673159 (1987-06-01), Schmidgall
Housel James C.
Hyway Contrete Pipe Company
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