Frank J Muckler

US Patent:

47841141, Nov 15, 1988

Filed:

May 21, 1984

Appl. No.:

6/613010

Inventors:

Frank Muckler - Stone Mountain GA
Edward B. Vandas - St. Louis MO

International Classification:

F21C 1520

US Classification:

126299E

Abstract:

A cooking or ventilating system has an extraction unit connected through an exhaust duct with the outside atmosphere, and a damper which is shiftable between positions operatively opening or closing the exhaust duct. A mechanism for opening and closing the damper under power includes an electric motor and a ball screw linear actuator driven by the motor. Air flow through the system is controlled to prevent exhausted grease from being carried up the exhaust duct. The damper is mounted for closing in the direction of air flow through the system and, when opened, for shielding the drive mechanism from smoke and grease, etc. , in the air flow. Control circuits provide automatically timed normal operation of the motor as well as control operation of detergent and spray wash apparatus of the ventilating system. The control circuits also include a thermosatic sensor arrangement for sensing temperatures within the extraction unit. In the event of a fire, the damper is closed by automatically initiated operation of the motor and water spray through the spray wash apparatus is initiated.