Apparatus for forming inverts and manhole assemblies and the lik

Details Apparatus for forming inverts and manhole assemblies and the lik Apparatus for forming inverts and manhole assemblies and the lik

1989-01-26

1990-07-17

Woo, Jay H.

Static molds

Container-type molding device

And an inner removable core to form recess or opening

249146, 249150, 249151, 249177, 249183, B28B 730, B28B 2188

Patent

active

049416430

ABSTRACT:
Apparatus for forming inverts in a manhole base comprising at least one adjustably positionable channel-forming member for forming an invert which communicates between associated sidewall openings of a manhole base. Flexible members join the ends of the invert form. The adjustability of the channel-forming assembly extends over a range of angles which are both greater than and less than 180 degrees.

REFERENCES:
patent: 3363876 (1968-07-01), Moore
patent: 3796404 (1974-03-01), Ditcher
patent: 3815864 (1974-06-01), Loeber
patent: 4119291 (1978-10-01), Polito
patent: 4143849 (1978-03-01), Good
patent: 4177229 (1978-12-01), Moore
patent: 4278229 (1981-07-01), Burlett
patent: 4318880 (1982-03-01), McIntosh et al.
patent: 4427619 (1984-01-01), Peterson
patent: 4484724 (1984-11-01), Srachangast
patent: 4565347 (1986-01-01), Ditcher

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