| 摘要 |
PURPOSE: A manhole cover opening/closing device by using a roller is provided to prevent the falling of a manhole cover by completely separating a cover from a supporter. CONSTITUTION: A manhole cover opening/closing device comprises a roller(30) and a roller housing(64). The roller is installed in a vertical body(22) of a supporter(20) of a manhole(10) using a shaft bolt(32). The roller housing is formed at edge of a cover(60) and positions the roller. |
