| 摘要 |
<p>A door or window frame is provided at a pair of opposite locations with tilting means mounting the frame in a wall opening for pivotal movement about an axis perpendicular to these sides of the frame. The frame is also equipped with fixing means which may be extended to engage the structure once the frame is in place. Where necessary, holding devices which are engaged upon pivotal movement of the frame are provided upon the frame and the structure along sides other than those carrying the tilting means, all of the several means and devices being locked once the frame is properly positioned by locking nuts or the like.</p> |
