Emergency ventilation control apparatus for animal confinement house
US4428278A · kind A · utility
Inventor
Key dates
| Filing date | Aug 26, 1981 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Aug 26, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01K1/007
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus responsive to electric power failure for opening curtains or doors normally covering ventilation openings in a confinement house of the type used for raising poultry and livestock is disclosed. An electromagnet (59) is provided which is energized by the electric power supply (41) to the house (10) and is de-energized upon failure of the electric power supply (41). A pivoted metal strip (61) is normally in contact with the magnet (59) and is interconnected by means of a cord (66) with the winch (25) which is used to raise and lower the curtains (16). When the electric power (41) fails and the electromagnet (59) is de-energized, the cord (66) releases, and allows the curtains (16) to fall under their own weight. A capacitor (78) prevents de-energization of the magnet (59) when momentary power failures occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.