Variable pitch fan

Details Variable pitch fan Variable pitch fan

1990-02-13

1992-06-16

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power or manual actuator on non-rotatable part

416157R, 416163, 416174, F04D 2906

Patent

active

051220342

ABSTRACT:
A fan assembly has variable pitch blades adjustable from outside the assembly while the fan is operating so as to alter the volume and direction of the induced airflow. The fan blades have an airfoil configuration such that air is moved by the fan in either direction with equal inefficiency. The airfoil configuration of the blades is neutral and the blades are straight. The fan assembly is lubricated by a pick-up non-rotatably mounted in a reservoir formed by the pulley hub and blade hub. The pick-up feeds lubrication directly to the bearing assemblies on which the spider and pulley hub are mounted.
The neutral airfoil shape of the blade extends along the blade, and the blade has a blunt leading edge and a tapered trailing edge.

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patent: 1635315 (1927-07-01), Ehinger
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patent: 4599041 (1986-07-01), Stricker
patent: 4842484 (1989-06-01), Johnson
patent: 5022821 (1991-06-01), Isert

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