| 摘要 |
<p>A closure lid for wall openings consists of a lid (4) removably set into a wall opening (2). When the lid (4) is set into the opening (2), its edge closely follows the edge of the opening and is flush with the surface of the wall that surrounds the edge of the opening. In part of the circumference of the lid, the marginal surface (11) of the lid (4) slants outwards from the front (12) to the back (13) of the lid. In at least part of the remaining circumference of the lid, its marginal surface (11) slants inwards from the front (12) to the back (13) of the lid (4). The marginal surface (17) of the opening (2) is substantially parallel to the marginal surface (11) of the lid (4). When the lid (4) has an approximately rectangular outline, the marginal surface (11) of the lid (4) slants outwards from the front (12) to the back (13) of the lid along one side (7) of the rectangle formed by the lid (4), and along both sides (8, 9) of the rectangle adjacent to the above-mentioned side (7) it slants inwards from the front to the back of the lid (4).</p> |
