Backup seal with bush in form of radially floating washer
US4552368A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1984 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Nov 30, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/929
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A backup seal for a main seal (not shown) sealing a rotary shaft (10) to a housing (12) comprises a rotary seal element (20) sealed (22) to the shaft (10) and a stationary seal element (16) sealed (18) to the housing (12). The seal elements (16,20) have opposing annular seal surfaces (41,42) surrounding the shaft (10) and these are adapted to be urged together to form a running seal therebetween substantially only by the pressure of fluid product leaking through the main seal should that fail. A second aspect of the invention provides a close fit bush (50) which helps to close the seal faces (41,42) together when the main seal fails and before any leak occurs between them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.