| 摘要 |
<p>S P E C I F I C A T I O N "Support Frame" A support frame for a man-hole cover or similar article of highway furniture has a vertical wall portion with an outwardly extending flange at one end. Support means for the cover on the inside of the flange is so arranged that the frame can be mounted either with the flange at the upper end of the wall or with the flange at the lower end of the wall, the top of the cover being level with the top of the frame in both cases. When the frame is mounted with the flange at the upper end, the frame is "self-levelling".</p> |
