The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 1986
Filed:
May. 30, 1985
Dennis J Ulicny, Carpentersville, IL (US);
ECM Motor Co., Schaumburg, IL (US);
Abstract
An electrically-operated fire damper actuator is disclosed which is adapted to operate an associated fire damper having louvers movable between opened and closed positions, with the damper or the actuator including a closing spring which urges the louvers to the closed position. The present actuator is configured to open the louvers in opposition to the closing spring, and maintain the damper in an opened condition against the action of the closing spring, while permitting the damper to close in the event of loss of power to the actuator. The actuator comprises an electric motor which operates through a multi-stage gear reduction unit for opening the louvers in opposition to the closing spring, and further includes an electric brake operatively connected to the motor rotor shaft for maintaining the damper louvers in the opened position. The present actuator further includes a one-way clutch mechanism with the gear reduction unit for avoiding damage to the reducing gears as the damper louvers move to the fully closed position under the action of the closing spring.