| 摘要 |
An opening and closing apparatus for a manhole cover includes a supporting member 2 having a number of elongated holes 1, two hook rods 4, each having a lower hook, and extending vertically through one of the elongated holes 1 of the supporting member 2, and a bracket 5 through which each hook rod 4 extends. A clamp 6 permits adjustment of the vertical position of each hook rod 4. Two horizontal extension members 8 horizontally adjustably connect to opposite ends of the supporting member 2 so that an upper surface of each horizontal extension member 8 wholly or partially overlaps the supporting member 2. A set of bolts 9 and nuts 10 tightly fasten the supporting member 2 to each horizontal extension member 8. A leg 11 projects downward from an inner end of each horizontal extension member 8. A hydraulic jack unit 17 has a base 15, two wheels 16 supported on the base 15, a fixed portion 14 fixed to an upper surface on the base 15 and standing upright therefrom, a lever 12, and a movable portion 13 adapted to be vertically moved by operating the lever 12. The movable portion 13 has a side surface integrally connected to an outer end of each horizontal extension member 8 and extends vertically at right angles to each horizontal extension member 8.
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