Closure means for circular openings of large diameter
US3990605A · kind A · utility
17Cited by
11References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1974 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Nov 20, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/426
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A closure for a large diameter circular opening such as the end of a tubular conduit subjected to internal positive pressure comprises a coaxial cover lid that may be opened only when a pressure relieving venting valve is opened, the cover lid being connected over the opening by screw threaded means of larger diameter than the inside diameter of the opening, and the venting valve having a removable closure cap which impedes removal of the lid until the internal pressure is vented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.