Patent ID: 6074294
Filing Date: 2000-06-13
Classification: B60H,Y10S

Abstract:
An air conditioning and ventilation system film valve assembly, comprising,a ventilation housing having at least one ventilation window with a predetermined length and width,a single drive shaft within said housing located generally parallel to and spaced from said ventilation window,a pair of idler shafts parallel to said drive shaft and bordering said ventilation window, and,a continuous film belt extending in opposite directions from said drive shaft and around said idler shafts and having a vent opening with a length and width sufficient to substantially overlap said ventilation window and a solid section adjacent to said vent window with a length and width sufficient to substantially block said ventilation window, a first pair of elongated, parallel drive bands at one end of said belt that are spaced apart substantially equal to the width of said ventilation window and a second pair of elongated, parallel drive bands at the other end of said belt that are spaced apart greater than the first pair of drive bands, with the ends of said first pair of drive bands being wrapped around said drive shaft inboard of the ends of said second pair of drive bands, and in the opposite direction thereto, so that, as said shaft turns, said two pairs of drive bands winding onto or off of said drive shaft in opposite directions and clear of one another, thereby shifting said belt back and forth around said idler shafts to selectively cover or uncover said ventilation window while leaving an unobstructed air flow path to said window between said pairs of drive bands.