Indicating apparatus for a damper opening/closing apparatus of an air diffuser

An opening/closing apparatus of a diffuser comprising:

• a case of a cylindrical form mounted at the center of a diffuser and including an indicating scale portion that has indicating scales formed along an arc adjacent to the outer front peripheral of the case;
• a rotating manipulation portion including a rotating shaft which passes through the center portion of one surface of the case and is extended in a predetermined length out of the case, an operating gear portion integrally formed around the outer peripheral of the rotating shaft and a knob integrally fixed to one end of the rotating shaft which has an extending portion passing through the other surface of the case to be connected to an operating rode of the damper;
• an indicating operation portion including an engaging gear of a larger diameter rotatably engaged with the operating gear, a shaft bearing having a center portion projected from the front surface of the case and an outer portion positioned adjacent to the front surface and an indicator coupled with the outer portion of the shaft bearing;
• a driven wheel including first and second plain gears integrated to each other, in which the first and second plain gears each has a larger diameter and a smaller diameter to be engaged with the operating gear and the engaging gear, so that the indicator is rotated by the shaft bearing to direct the indicating scale on the indicating scale portion.