| 摘要 |
<p>A device for covering shafts of manholes in roads, (3) which is slideably guided in a covering ring (2) that is rigidly fixed on the shaft (1) proper, and a retaining ring (4) for receiving the shaft cover positioned in the plane of the road surface (6). Flexible fastening and simple construction is obtained by mounting the retaining ring (4) on the tube (3) so as to be detachable, with a limited degree of movement.</p> |
