| 摘要 |
<p>A hingeless ventilator for an opening in a wall having a frame fixable to the wall about the opening, a foraminous plate unitary with the frame for screening the opening, and a closure member on a side of the wall and swingable against the frame at one or each side of the opening for opening and closing the opening. A spring rod on the opposite side of the wall and connected to the closure member by laterally spaced arms, rides on guides fixed to the frame for selectively positioning the closure member, while normally spaced means on the closure member and frame and interfitting during swinging of the closure member substantially fix the latter's swinging axis or axes. The arms connecting the spring rod to the closure member are flat and extend through and ride in slots in the screen plate and are so shaped as substantially to fill the slots over their range of relative movement. A locating rib outstanding from the foraminous plate adjacent sides thereof and engaging the inner face of the closure member, either directly or through a sealing gasket thereon, positions the closure member during the initial portion of its swing for later engagement of the interfitting means.</p> |
