Process and assembly for enclosing a volume

Claim 1

AN ENCLOSED WORKING AREA ASSEMBLY COMPRISING: A WORKING AREA SURFACE HAVING A PREDETERMINED LONGITUDINAL AND LATERAL EXTENT, FIRST SUPPORTING MEANS EXTENDING BENEATH SAID SURFACE WHILE ENGAGING AND MAINTAINING SAID SURFACE IN A RAISED POSITION TO PROVIDE AN UNOBSTRUCTED AREA BENEATH SAID SURFACE, A FLEXIBLE FILM ENCLOSURE OF APPROXIMATGELY CYLINDRICAL SHAPE, SAID ENCLOSURE HANGING FREELY ALONGSIDE AND EXTENDING CONTINUOUSLY AROUND AND OUT OF CONTACT WITH SAID WORKING AREA SURFACE, SAID ENCLOSURE HAVING A CENTRAL AXIS AND BEING AT LEAST TWICE THE LONGITUDINAL LENGTH OF SAID SURFAC, INLET MEANS TO INFLATE SAID ENCLOSURE, SECOND SUPPORTING MEANS POSITIONED ON SAID ASSEMBLY AND CONNECTED TO SAID ENCLOSURE FOR TELESCOPIC MOVEMENT OF SAID ENCLOSURE AROUND SAID SURFACE ALONG THE CENTRAL AXIS, SAID ENCLOSURE BEING PROVIDED WITH END PANELS INTERSECTING SAID CENTRAL AXIS, MEANS MAINTAINING EACH END PANEL HAVING ANINTERIOR PORTION AT A PREDETERMINED CONSTANT SEPARATION, A ROLLABLE UNDERLAP MEANS INTEGRAL WITH SAID INTERIOR PORTION AND FORMING A PORTION OF SAID END PANEL, SAID UNDERLAP MEANS COMPRISING A FLEXIBLE SHEET CONNECTED TO SAID FILM ENCLOSURE AND SURROUNDING SAID INTERIOR PORTION, SAID UNDERLAP MEANS AND SAID FILM ENCLOSURE EACH HAVING AN INNER AND AN OUTER SURFACE, WHEREBY WHEN THE ENCLOSURE IS INFLATED A GAS FILLED FOLD IS FORMED BETWEEN OPPOSED AND FACING INNER SURFACES OF SAID UNDERLAP MEANS AND SAID FILM ENCLOSURE TO PERMIT SAID FILM ENCLOSURE TO BE ROLLED ALONG SAID CENTRAL AXIS.