Rolling ramp inlet
US5097749A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1990 |
| Grant date | Mar 24, 1992 |
| Priority date | — |
| Expiry date | Dec 6, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01K1/0058
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A ventilation control apparatus for use with a building ventilation system in a building. The building ventilation system including input and outlet vents and a fan. An opening is formed in the ceiling of the building for introducing ventilating air flow into the building from the input vent through the opening and out through the outlet vent. The ventilation control apparatus includes a movable baffle and may have a baffle counterbalance attached to the movable baffle. The movable baffle is positioned under the opening for regulating air flow through the top channel into the building. The counterbalance, if used, is attached to the movable baffle and weighted for closing the movable baffle a desired distance relative to the top channel when the fan is not operating and for controllably regulating movement of the movable baffle relative to the top channel when the fan is activated to create a pressure drop across the top channel. The pressure drop creates a force which moves the movable baffle member. The movement of the baffle member lowers the pressure drop and is hence self adjusting. The baffle will move to the position appropriate to the amount of air flowing. Adding weight to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.