Fume hood exhaust terminal having an electrically driven linear

Details Fume hood exhaust terminal having an electrically driven linear Fume hood exhaust terminal having an electrically driven linear

1997-03-10

1998-11-10

Joyce, Harold

Ventilation

Workstation ventilator

Covered workbench chamber

25112912, 251228, B08B 1502

Patent

active

058335293

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.

REFERENCES:
patent: 1926120 (1933-09-01), Snediker
patent: 3993096 (1976-11-01), Wilson
patent: 4418719 (1983-12-01), Downs, Jr. et al.
patent: 4472999 (1984-09-01), McCabe
patent: 4605198 (1986-08-01), Greiner
patent: 4784114 (1988-11-01), Muckler et al.
patent: 5106052 (1992-04-01), Datta
patent: 5278454 (1994-01-01), Strauss et al.
patent: 5518446 (1996-05-01), Jacob
patent: 5519295 (1996-05-01), Jatnieks

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