Ceiling grille for rooftop air conditioner unit

A ceiling mounted grille for a motor vehicle for directing conditioned air from an air conditioning unit mounted upon the roof of the vehicle into the passenger compartment of the vehicle, wherein said grille includes

• a plenum for receiving conditioned air for the air conditioning unit, said plenum having a front wall, a rear wall and opposed side walls,
• a front deflector vane rotatably mounted in the front wall of said plenum,
• a rear deflector vane rotatably mounted in the rear wall of the plenum,
• a first rocker arm connected to the front deflector vane and a second rocker arm connected to said rear deflector vane, said rocker arm being arranged to rotate said deflector vanes between an open position and a closed position,
• a cam having a profiled camming face thereon,
• a first cam follower arranged to ride in contact with said camming face and a second cam follower also arranged to ride in contact with said camming face,
• means for connecting said first rocker arm to said cam follower and said second rocker arm to said second cam follower for selectively positioning the deflection vane in response to the positioning of the cam, and
• drive means for positioning said cam.