Fume hood exhaust terminal having an electrically driven linear actuator
US5833529A · kind A · utility
6Cited by
10References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 10, 1997 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Mar 10, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2013/1473
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A fume hood exhaust terminal for controlling gas flow in an exhaust duct has an electrically driven linear actuator for angularly positioning a damper in the terminal. Drive circuitry employed in the preferred embodiment prevents the possibility of shorting out the actuator motor in the event of an input signal condition which would attempt to operate the motor in two directions simultaneously. The circuit also includes a power failure detection circuit which includes the capability of storing sufficient power to place the damper in a preferred position until power is restored to the exhaust terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.