a protective cover for the left hand panel edge as well as to provide protection for the contacting door jamb 58 the presence of relatively rigid sleeve 36 makes possible the use of flexible panel materials that provide the closure member with characteristics that are peculiarly suited to different specialized purposes for example some applications require a flexible resilient light weight panel which is also transparent such a panel e g a panel made of clear lucite u00ae can replace a heavy substantially rigid door structure having glass inserts for viewing through the door in addition to being easily deflected by loads pushed through the self closing door such a panel has the added advantage of resisting shattering and other damage that may occur in a conventional door subjected to such treatment further the danger of injury to person or object which is ever present where a self closing door is used particularly one without damping means is materially reduced in the present invention due to the lightness of the overall structure fig5 illustrates the present invention in combination with a double door wherein the door panel is in the nature of a curtain as before applicable reference numerals have been carried forward substantially identical doors are supported on opposite.