| 摘要 |
A two-way hingeless ventilator (10) for ventilating an enclosure through a wall (15) thereof has a frame (21) defining an opening therethrough. A closure member (30) 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 (34) is fixed on the frame (21) and extends between opposite sides of the opening (22). An actuating member (40) extends from an inner side of the closure member through the opening and intermediate ends of the tensioning rod. A positioning slot (46) 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.
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