Monolithic precast invert system

Details Monolithic precast invert system Monolithic precast invert system

1983-07-19

1986-01-21

Woo, Jay H.

Static molds

Uniting preform with molding material

249 11, 249145, 249146, 249184, B28B 730, B28B 2188

Patent

active

045653470

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.

REFERENCES:
patent: 3758066 (1973-09-01), Skinner et al.
patent: 3796406 (1974-03-01), Ditcher
patent: 3815214 (1974-06-01), Kyle, Sr.
patent: 4085918 (1978-04-01), Wilkerson
patent: 4119291 (1978-10-01), Polito
patent: 4177229 (1979-12-01), Moore
patent: 4278229 (1981-07-01), Burlett
patent: 4318880 (1982-03-01), McIntosh et al.
patent: 4422994 (1983-12-01), Ditcher

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