Vent valve of an air pump
US4886093A · kind A · utility
14Cited by
5References
20Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 20, 1988 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Dec 20, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7891
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A vent valve of an air pump typically utilized in an aquarium apparatus. The vent valve includes a wall member with a vent hole in the wall member. A valve body having a flap member closes onto the vent hole. The closure action of the flap member is regulated so that the flap is twisted under the force of air flowing through the vent hole in a direction toward the flap member and returns to a closed position against the wall member with a rolling sidewise fold-down motion when an air flow lessens. In this manner, there is a reduction in the flapping noise of the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.