Rust-resistant sleeve for use in a branch hole of a water pipeline
US6158474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1999 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Feb 8, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S285/925
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A reliable sleeve unit with a water-absorbing swelling rubber that provides a reliable seal to a branch hole and the branch stop while controlling the development of rust. The rubber layer is applied on a cylindrical metal sleeve having a flange on its outer circumference in a manner such that a certain height length of the metal sleeve from its bottom end face is left uncovered. The height length of the flange is set to be long enough for the flange to be inserted into the inner circumference of the branch pipe to be connected to the branch hole. The rubber layer is applied onto the metal sleeve in a manner such that the height length of the rubber layer coating the metal sleeve is approximately equal to the wall height of the branch hole, or in a manner such that the bottom edge of the rubber layer is set to be higher than the bottom end face of the metal sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.