| 摘要 |
A prefabricated hatch construction for attachment over an opening in a wall or the like, comprising a rectangular reinforced plastic frame and a reinforced plastic cover hinged thereto. The frame is of channel-like cross section, including a depending inner skirt to extend through the wall opening and an outwardly extending peripheral flange to overlie and be secured to those portions of the wall which border the opening thereof. The flange has a reversely curved section providing for wind and rain deflection, and also constituting a springy-bearing for a sealing gasket which is engageable with the wall. The cover is crowned and has a depending peripheral flange which wedgingly engages the channel section of the frame to effect a tight seal. Adjustable telescopic struts provide for holding the cover in various open positions on the frame, and cooperable fastener devices lock the cover in its closed position.
|
