Patent ID: 7828224

Claim:
An air conditioning diffuser having a function of automatically changing an air supply direction, comprising: a frame fastened to a ceiling of a room and communicating with an air duct through which cold or hot air passes, with an air passage defined in the frame so that the cold or hot air is supplied from the air duct to the room through the air passage; a temperature sensing cylinder mounted to a support bracket fastened to the frame in the air passage, with a wax charged in the temperature sensing cylinder to expand or contract depending on a temperature of the cold or hot air passing through the air passage, and a piston rod provided in the temperature sensing cylinder such that the piston rod is advanced from a lower end of the temperature sensing cylinder by expansion of the wax; a blade support body coupled to the lower end of the temperature sensing cylinder using coupling means, with a plurality of removal prevention supports provided in a circumferential outer rim of the blade support body and spaced apart from each other at regular angular intervals, and a plurality of rotating shaft seats formed in the respective removal prevention supports and in an outside wall of the rim; a pushing member coupled to a lower end of the piston rod and placed in the blade support body; a vertical movable member provided in a space defined in the blade support body to ensure movement of the vertical movable member therein, the vertical movable member being pushed downwards by the pushing member when the wax is expanded, with a plurality of eccentric shaft seats formed around an intermediate portion on a circumferential outer surface of the vertical movable member and spaced apart from each other at regular angular intervals; a plurality of air guide blade assemblies supported by the blade support body, each of the air guide blade assemblies comprising: a blade exposed outside the blade support body; a rotating shaft extending from the blade and rotatably seated in the respective rotating shaft seats of the blade support body, with a stopper provided on an outer surface of the rotating shaft and stopped by each of the removal prevention supports of the blade support body; a connection part extending from the rotating shaft in a predetermined direction; and an eccentric rotating shaft protruding from the connection part so as to be eccentric from the rotating shaft, the eccentric rotating shaft inserted into each of the eccentric shaft seats of the vertical movable body so that, when the vertical movable member is moved upwards or downwards, the eccentric rotating shafts are moved upwards or downwards, thereby the blades are rotated around the rotating shafts in a closing or opening direction; and an elastic member provided under the vertical movable member at a lower position in the space of the blade support body so that, when the vertical movable member is released from the pushing member by contraction of the wax of the temperature sensing cylinder, the elastic member biases the vertical movable member upwards.