Monolithic precast invert system
US4565347A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1983 |
| Grant date | Jan 21, 1986 |
| Priority date | — |
| Expiry date | Jul 19, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F2005/028
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.