Manhole assembly with water barrier
US4593714A · kind A · utility
Inventor
Key dates
| Filing date | Jun 19, 1984 |
| Grant date | Jun 10, 1986 |
| Priority date | — |
| Expiry date | Jun 19, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7021
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A manhole assembly is attached on a fill pipe for an underground storage tank for gasoline, diesel fuel or other types of toxic chemicals. The manhole assembly comprises a bucket-like body attached on an upper end of the fill pipe and a removable cover mounted on an upper end of the body to selectively expose the fill pipe. At least one annular dam is formed on an upper surface of the body and is adapted to nest within an annular groove formed on an underside of the cover. The dam functions as a barrier to prevent the ingress of water into the body during rainstorms and the like. A combined sealing and cushioning assembly attaches a bottom wall of the body to the fill pipe and a drain connection is provided for selectively communicating an internal chamber of the body with the fill pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.