| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a reversal device of a manhole cover, for gently reversing by dead weight, and also reversible without requiring strong force when reversing.SOLUTION: In a reversal device 1 of a manhole cover for reversing a manhole cover 10 held by holding means 20, the cover 10 comprises a disk-like cover part 11 and a rib part 12 formed under the cover part 11, and the holding means 20 comprises a pair of support shafts 12 for holding the cover part 11 from the side surface side and forming a rotational center 26A when reversing the cover 10, in a position opposed to the diametrical direction of the cover 10, and a support shaft 26 is arranged so that the rotational center 26A is parallel to a gravity center surface 13A of passing through the center of gravity 13 of the cover 10 and is also positioned in a thickness directional area of the cover 10.</p> |
