Patent ID: 8573083

Claim:
A fan biasing transmission mechanism, comprising: a housing having a first mounting chamber, a second mounting chamber and a third mounting chamber disposed intermediate said first and second mounting chambers; a control rod mounted in said first mounting chamber, said control rod having a driving gear wheel and a driven gear mounted thereon; a worm coupled to a motor and meshed with said driving gear wheel; a follower gear wheel pivotally mounted in said second mounting chamber; a link coupled with said follower gear wheel; two speed-changing transmission gears pivotally mounted on a common shaft in a stepped manner in said third mounting chamber and respectively meshed with said driven gear and said follower gear wheel, a lower end of said shaft being supported in said third mounting chamber; a locating plate bridging between said first and third mounting chambers and having an opening for receiving an upper end of said shaft therein for supporting said two speed-changing transmission gears in respective meshing engagement with said driven gear and said follower gear wheel; and a cap forming a closure for said housing, said cap having a cavity for receiving an upper end of said control rod therein to provide support thereof.