초록 ▼

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

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.

대표청구항 ▼

An actuator for a fire damper having louver means movable between opened and closed positions, and associated closing spring means for urging said louver means to said closed position, said actuator comprising: electric motor means having a rotatable rotor shaft; gear reduction means operatively con

An actuator for a fire damper having louver means movable between opened and closed positions, and associated closing spring means for urging said louver means to said closed position, said actuator comprising: electric motor means having a rotatable rotor shaft; gear reduction means operatively connected with said louver means, said gear reduction means being driven by said rotor shaft whereby said motor means acts in opposition to said closing spring means to move said louver means from said closed position to said opened position; and electric brake means operatively connected with said rotor shaft, whereby actuation of said brake means after said electric motor means has been switched off brakes rotation of said rotor shaft to maintain said louver means in said opened position, said brake means being released when electric current is not applied thereto, whereby said closing spring means moves said louver means from said opened position to said closed position, said closing spring means acting during closing of said louver means to drive said rotor shaft of the switched-off motor means in a reverse direction opposite the direction of rotation during opening of said louver means.