Patent ID: 7641125

Claim:
A ceiling diffuser comprising: a. a diffuser hood with an air inlet for receiving warm or cool air from a duct and an air outlet for discharging the warm or cool air into an occupied space; b. a base plate supported within the diffuser hood; c. a damper stack extending between the base plate and the air inlet d. a damper movably mounted on the damper stack for opening and closing the air inlet; e. a supply temperature actuator for sensing the temperature of the warm or cool air received from the duct f. a room temperature actuator for sensing the temperature in the occupied space; g. a linkage for moving the damper on the damper stack to open and close the air inlet, wherein the linkage has a heating mode and a cooling mode that are selected by the supply temperature actuator and wherein the linkage includes: i. a heating slide alternatively engaged by the room temperature actuator; ii. a cooling slide alternatively engaged by the room temperature actuator; iii. a cam actuator alternatively driven by the heating slide and the cooling slide; iv. a cam lift profile driven by the cam actuator that engages the damper to move the damper to open and close the air inlet, wherein the supply temperature actuator selects the heating slide for engagement with the room temperature actuator for the heating mode and wherein the supply temperature actuator selects the cooling slide for engagement with the room temperature actuator for the cooling mode and wherein the heating slide and cooling slide are free to slide with respect to each other.