Manhole cover sealing and locking arrangement
US4763449A · kind A · utility
35Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1987 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Oct 20, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/1427
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A manhole for an urban sanitary system comprises a cover 2, a frame 1 for receiving the cover, a toric elastomeric sealing ring G1 interposed between the frame and the cover, and a soundproofing ring G2 on which the cover seats. The locking of the cover on the frame and the support of the cover on the rings G1and G2 are implemented by a plurality of flanges 4 recessed in the frame and bolted thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.