Water lock method and apparatus
US5299884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1991 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Sep 10, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/1409
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A watertight chimney assembly prevents infiltration of water in the region between a manhole cover support frame and a concrete manhole assembly. The watertight chimney, in one embodiment, is comprised of a pair of tubular telescoping sleeves each provided with a flange for mounting respectively to and between the top lip of a manhole assembly and the bottom surface of a flange on the cover support frame supported a desired distance above the top of the manhole assembly to maintain the cover frame at proper grade. An O-ring seated within an annular groove provided in one of the tubular sleeves provides a sliding watertight seal therebetween. The sleeve flanges are arranged and compressed between the cover support frame and manhole assembly and contribute to the watertight seal. One of the sleeves is reversible to increase the telescoping range between a minimum and a maximum extension. In an alternative embodiment, the internal surface of the manhole opening constitutes one of the telescoping members. A sealing gasket may be arranged on either of the two telescoping members and may be seated within a groove or clamped against the manhole opening. The sealing gasket may be any one o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.