| 摘要 |
A beam having intermediate the ends thereof at least one guide for a grab element provided to be detachably connected to the cover and at one end thereof has a support provided to act against a surface outside the cover and at the opposite end thereof a screw spindle, which is rotatably connected to a shoe, provided to act against a surface outside the cover and diametrically opposed to the first-mentioned surface. The beam is further provided with guide means for receiving one end of a lever in such a manner that the lifted up cover can be pivoted about the rotational axis of the shoe to a place beside the manhole opening. The lever is preferably shaped as a spanner and has a key to operate the screw spindle as well as cocks and the like. |
