Round damper and fusible link therefor
US4559867A · kind A · utility
21Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1984 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | Jun 29, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1834
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A transversely circular fire damper having a butterfly type blade operated by a jack shaft spaced longitudinally of the housing from the blade axle. Linkage including an "over center" stop rotates the blade in one direction by operation of a motor coupled with the shaft. A clutch in the form of a pair of relatively telescoped members secured together with entectic solder is connected with the jack shaft and the motor so that the shaft is released from the motor when the ambient temperature reaches a point high enough to melt the solder. The jack shaft is spring biased in a direction to close the damper blade under such condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.