| 摘要 |
A height adjuster of a manhole cover is provided to reduce the construction cost by simplifying the structure, to improve customer satisfaction by variously regulating the height, and to reduce the labor cost by installation of an unskilled worker. A height adjuster(130) of a manhole cover(120) installed between a manhole main body(110) and the manhole cover to regulate up-down length comprises a base pipe unit(131) formed with a first adjusting unit from the upper end faced with at least two positions of the pipe-like outer peripheral wall placed at the upper side of the manhole main body to arrange plural through-holes vertically at regular intervals; a slide pipe unit(133) inserted into the base pipe unit to slidingly move up and down and formed with a second fixing hole congruously with the through-hole of the first adjusting unit on the lower end faced with at least two positions of the outer peripheral surface of the pipe shape; and a combining member(135) penetrated through the second fixing hole of the slide pipe unit and one of the through-holes of the first adjusting unit of the base pipe unit. |
