of the curtain while passing across a left side roller and a right side roller mounted to opposite ends of the curtain 39 s leading edge the strap runs underneath the left roller to support the left side of the curtain the strap runs across the top of the right roller to keep the strap from simply dropping out from underneath the left roller application_number US 99129901 A description a multipurpose barrier 10 includes a curtain 12 that is vertically moveable to an open position fig1 various intermediate positions fig2 and a closed position fig3 the term u201c curtain u201d refers to any sheet that can readily bend and repeatedly recover its original shape examples of curtain 12 include but are not limited to a pliable sheet of plastic a pliable sheet of fabric and an assembly of pivotally interconnected rigid panels the curtain 39 s movement allows it to selectively cover and uncover an access opening 14 between two vertical tracks 16 and 18 such an opening may simply be a doorway or may provide physical or visual access to an area that at times is preferably shielded or guarded as curtain 12 opens the lower portion of curtain.