Shutter-fan system

Claim 1

A shutter-fan assembly for use with a temperature modifying system, comprising: assembly mounting means for mounting the assembly in spaced relation with a temperature modifying system; a rotor assembly attached in rotatable relation with said mounting means, having a substantially circular array of blades extending outwardly therefrom, at least some of said blades being moveable from a first obturating position to a second, blowing position; thermally responsive means to move the moveable blades from one said position to the other said position, and means to rotate said rotor assembly whereby in operation when in said second blade position the assembly functions as a fan said blades being individually supported on anti-friction mountings for movement between said positions, each blade having a cam spindle off-set from the blade axis of movement, said thermally responsive means including a temperature sensitive pushing element in thermal contact with coolant inlet conditions to the engine, push rod means connected thereto for displacement axially within said rotor assembly, and anti-friction thrust means connecting said push rod means with said blade spindles to accurately position said blades in response to changes in length of said pushing element produced by temperature change in said coolant, said push rod means including a resilient loading device to provide pre-determined pre-load to the push rod means.