Manhole invert casting system
US4867411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1987 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Aug 28, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F5/021
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A plurality of invert forming mold members are bolted together and have their ends received in internal frames provided at adjacent pipe openings in a manhole. The mold members are formed of relatively thick and heavy polyurethane and are of U-shaped cross-section. A mold supporting plate is provided in each of the internal mounting frames and has an opening configured to matingly receive the endmost mold component. The mold components are provided in a variety of linear lengths, angular curved configurations and elevation changing members so that they can be associated to form inverts required for any particular manhole configuration. The assembly of mold members is extremely strong and rigid and does not require any additional internal bracing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.