Abstract: A fan biasing transmission mechanism includes gearbox affixed to the rear side of the housing of an electric fan's fan motor, a control rod pivotally and axially movably mounted in the gearbox. a power gear fixedly mounted on the control rod and meshed with a motor shaft worm wheel of the fan motor, a driving gear pivotally mounted in the gearbox, a gear-clutch gear fixedly mounted on the control rod and movable with the control rod into mesh with the gear-clutch gear, a first bevel gear fixedly mounted on the driving gear, a second bevel gear meshed with the first bevel gear, a bracket, a crank arm pivotally coupled between the gear shaft and the bracket, and an elastic member connected between the gear shaft and the gearbox.

Abstract: In the exemplary embodiment, an electric rotary fan has a fan head including a rotary motor and a fan blade, the fan blade rotated by the motor for producing an air stream. A pair of rubber bushings are each disposed between the fan head and a stand and each have a hole though the bushing and a key displaced from the hole, the holes of both bushings being coaxially aligned on a horizontal pivot axis. A pair of fasteners each pass through the associated bushing's hole to affix the fan head to the stand such that each fastener and its associated bushing cooperate to allow forced pivoting of the fan head relative to the stand the pivot about the pivot axis. The keys prevent relative pivoting between the bushings and the fan head by each engaging a mating tab hole in the fan head.

Abstract: A fan biasing transmission mechanism includes gearbox affixed to the rear side of the housing of an electric fan's fan motor, a control rod pivotally and axially movably mounted in the gearbox. a power gear fixedly mounted on the control rod and meshed with a motor shaft worm wheel of the fan motor, a driving gear pivotally mounted in the gearbox, a gear-clutch gear fixedly mounted on the control rod and movable with the control rod into mesh with the gear-clutch gear, a first bevel gear fixedly mounted on the driving gear, a second bevel gear meshed with the first bevel gear, a bracket, a crank arm pivotally coupled between the gear shaft and the bracket, and an elastic member connected between the gear shaft and the gearbox.