Monolithic precast invert system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 21, 1986
Grant Date -
N/A
app pub date -
Jul 19, 1983
filing date -
Jul 19, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Concentric inner and outer molds define the walls of the manhole base to be cast. The top of the inner mold is provided with a stationary invert forming section and at least one swingable invert forming section swingably mounted upon a centrally located pivot pin. The invert forming mold member is provided with locating openings adapted to receive the pin within the swingable invert forming section to positively and accurately locate the swingable invert forming section. The open region between the fixed and movable sections is filled with a 'knee' member in the form of a hollow curved shell which defines the central portion of the invert. The top of the inner mold may alternatively be provided with two or more swingably mounted invert forming sections.
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Cited Art Landscape
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