Patent ID: 6231438
Filing Date: 2001-05-15
Classification: F24F

Abstract:
In an underfloor air diffuser system for transmitting air from a series of underfloor plenums through at least one floor opening to the space above the floor, where said floor opening extends between an upper surface and a lower surface and includes a circular grate essentially flush with said upper surface, the improvement comprising in combination therewith the provision of a manually adjustable airflow damper assembly for controlling airflow from said plenums to said space from a fully opened position to a fully closed position, said airflow damper assembly comprising:a) a circular grate housing having a cylindrical body portion with an outwardly extending flange portion to override said upper surface, where said body portion extends through a said floor opening, a shoulder spaced internally below said flange portion, a circular flange member threadably engaging said body portion for fixedly securing said body portion to said floor, and plural cam riding pins projecting inwardly from said body portion;b) a circular sleeve member having a continuous upper edge and a continuous lower edge, plural angled cam slots extending in close proximity from said upper edge to close proximity to said lower edge, one said slot for each said cam riding pins, where said circular sleeve member is fixed to said body portion by means of said cam riding pins to allow both rotative and vertical movement of said sleeve member relative to said body portion, and a pair of axially extending, spaced apart arms; andc) a manually rotatable, circular grate mechanism sized to seat on said internal shoulder, said grate mechanism including a series of concentric, spaced apart grate rings with openings to allow passage of air therethrough, a peripheral portion to essentially lie contiguous with the interior of said body portion, plural fixed vane members to direct the passage of said air, a suspended dirt basket, and a downwardly extending axial arm positioned to be slidably received between said spaced apart arms.