Fan assembly

Details Fan assembly Fan assembly

1974-12-23

1976-07-06

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power or manual actuator on non-rotatable part

165 39, 416162, 416164, F04D 2936

Patent

active

039679160

ABSTRACT:
A fan assembly particularly adaptable for use with an induced draft heat exchanger having a fan with a plurality of variable pitch blades, a drive mechanism and a pitch control mechanism, wherein the drive mechanism and the pitch control mechanism are designed to be located upstream of the heating element on the cool-air side of the heat exchanger. The pitch control mechanism is coupled directly to the rotating fan shaft, separate from the frame member for the heat exchanger to prevent problems in the alignment of the bearings for supporting the fan assembly. A fail safe mechanism is also provided in the rotating assembly of the fan to insure maximum pitch of the fan blades if the pitch control mechanism fails.

REFERENCES:
patent: 457513 (1891-08-01), Littlejohn
patent: 2010640 (1935-08-01), Michl
patent: 2225209 (1940-12-01), Dewey
patent: 2478244 (1949-08-01), Cooley
patent: 2743088 (1956-04-01), Bach
patent: 2826395 (1958-03-01), Petty
patent: 2844303 (1958-07-01), Kristiansen
patent: 3116794 (1964-01-01), Walker et al.
patent: 3148735 (1964-09-01), Miller et al.
patent: 3173343 (1965-03-01), Berry

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