Movable blade damper
US4253483A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1978 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Jul 12, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/4259
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a damper having an opening therethrough, an aperture defining blade member is movable between a first position, in which the aperture is aligned with the opening to permit the flow of fluid through the damper, and a second position, in which the blade member substantially blocks the flow of fluid through the damper opening. A sealing member is located around the periphery of the opening adjacent the blade member to substantially abut the blade member in both the first and second blade positions. A pressurized fluid such as air is supplied to the sealing member to promote flow of fluid between the sealing member and the blade member into the opening, and thereby substantially to prevent the leakage of fluid out of the opening between the blade member and the sealing member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.