Hingeless ventilator

摘要

A two-way hingeless ventilator for ventilating an enclosure through a wall thereof has a frame defining an opening therethrough. A closure member is disposed against an outer side of the frame and is alternately swingable relative to the frame between open and closed positions at opposite sides of the opening. A tensioning rod is fixed on the frame and extends between opposite sides of the opening. An actuating member extends from an inner side of the closure member through the opening and intermediate ends of the tensioning rod. A positioning slot is defined in the actuating member through which the tensioning rod passes in a tensioned condition to apply a closing force to the closure member. The positioning slot has a central position defining a closed position of the cover member and opposite side slots extending away from the central position. The closure member is variably movable from the closed position to oppositely facing open positions by rotation or pivoting of the actuating member which causes the tensioning rod to variably engage along either of the side slots in its tensioned condition. An assist member is configured with the actuating member to add a mechanical advantage to the opening and closing operation.