Method and apparatus for providing watertight seal for manhole pipe connection
US4387900A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1982 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | May 5, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/5383
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A resilient gasket having an outer annular flange positioned within a manhole opening and maintained thereagainst under compression by means of a compression band. The gasket is provided with a central opening defined by an enlarged beaded periphery having an elasticity adapted to tightly encircle the outer periphery of the pipe. A folded intermediate section is arranged between and integrally joined to the outer flange and the beaded inner periphery, the intermediate section is comprised of first and second diagonally aligned annular portions integrally joined along a fold to define a V-shape which imparts a yieldability enabling the gasket to maintain a watertight seal between the manhole opening and the pipe, even in the presence of a significant misalignment therebetween. A strap is positioned about the intermediate section of the gasket adjacent the inner beaded periphery to enhance the watertight seal between the gasket and the pipe. The compression band may be provided with pairs of substantially V-shaped slots which enable the band to assume a curvature in a direction transverse to the curved periphery in order to conform to the curvature of the manhole opening. The clampin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.