Dust-proof cabinet

Claim 1

A DUST-FREE WORK CABINET, COMPRISING A FLAT BASE WITH A FRAME AROUND THE BASE; A ONE-PIECE, RIGID, TRANSPARENT MOLDED PLASTIC HOOD HAVING A CLOSED TOP AND OPEN BOTTOM, SAID BOTTOM HAVING A PERIPHERAL FLANGE, HINGE MEANS PIVOTALLY SECURING ONE EDGE OF THE FLANGE TO ONE EDGE OF SAID BASE, RESILIENT GASKET MEANS ON SAID BASE HERMETICALLY SEALING THE OPEN BOTTOM OF THE HOOD TO THE BASE, SAID HOOD HAVING AN OPENING IN ONE SIDE THEREOF, SAID FRAME HAVING A DISCONTINUITY AT ANOTHER EDGE OF THE BASE REGISTERING WITH SAID OPENING SO THAT THE BASE EXTENDS FLAT OUT TO SAID OTHER EDGE THEREOF, SAID HOOD HAVING ANOTHER OPENING IN THE TOP THEREOF, AND AN AIR TREATING ASSEMBLY MOUNTED IN SAID OTHER OPENING TO MAINTAIN A TREATED ATMOSPHERE INSIDE THE HOOD, SAID ASSEMBLY COMPRISING A GENERALLY CYLINDRICAL CASING HAVING AN EXTENSION PASSING AXIALLY THROUGH SAID OTHER OPENING, SAID CASING HAVING OPEN OPPOSITE OUTER AND INNER ENDS, AN AIR BLOWER DISPOSED IN THE CASING ADJACENT SAID OUTER END FOR DRAWING AIR INTO THE HOOD, A DUST-REMOVING AIR FILTER DISPOSED IN ALIGNMENT WITH SAID BLOWER AND RECEIVING AND PASSING AIR THEREFROM.