Two position rotary actuator incorporating DC solenoid
US6651952B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1999 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | Jan 29, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/165
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for controlling a ventilation damper unit utilizing a direct coupled two-position rotary damper actuator with a DC solenoid is disclosed. The actuator acts to rotate the output coupling, and in turn, the damper shaft to open the damper. After approximately 95 degrees +/−3 degrees of output coupling rotation, a limit switch is activated and a DC solenoid equipped with a full way bridge rectifier extends to a brake rotor to lock the damper into position. Simultaneously power is shut-off to the actuator motor assembly to reduce electrical consumption. Upon complete power failure to the actuator unit, such as during a fire and smoke emergency, the DC solenoid is spring returned allowing the damper to be spring returned to a closed position, thus preventing flow of air and smoke through a building and starving a fire of oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.