Adjustable pitch fan

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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230/3

F04D 29/36 (2006.01)

Patent

CA 1119566

ABSTRACT OF THE DISCLOSURE Apparatus having radially disposed adjustable pitch fan blades embodies a split hub that is adapted to retain the blades in the plane of the hub. One portion of the hub includes an annular base with concentric upstanding inner and outer walls that define a channel. The outer wall includes a plurality of openings in which the blades are rotatably journalled with a cam portion of each blade extending into the channel. Cam follower means are slidably disposed in the channel and interlink adjacent cam portions so that rotation of any one blade will correspondingly adjust the pitch of each of the other blades. The blades are locked to a pre- determined pitch setting by fastening the hub portions together. Another embodiment includes the fan blades and split hub which is bushed and secured to a shaft of a reversible drive motor. The fan and motor are mounted in a housing having open ends, an inlet end including air straightening means to improve air coupling with the fan blades and being adapted to fit a grain drying bin. The other end includes a shutter that is normally closed but which opens under air pressure to exhaust the air from the bin when the apparatus operates. Means are provided to hold open the shutter so that when the motor rotation is reversed, air may be blown into the bin.

315690

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