| 摘要 |
PURPOSE: A locking device of a manhole cover is provided to prevent a safety accident by preventing the separation of the manhole cover, and automatically controlling water and gas pressure inside a manhole. CONSTITUTION: A locking device of a manhole cover comprises a support frame(110), an ascending and descending unit(130), and a stopper(140). The support frame comprises a circular frame(111), an ascending and descending unit support stand(113), and a support stand(112). The ascending and descending unit is inserted into the ascending and descending unit support stand. The top end of the ascending and descending unit support stand is combined with a manhole cover(120). The central part of the ascending and descending unit support stand is perpendicularly punched with a guide pin combining slot(134). The guide pin combining slot is elevatably combined with the manhole cover through a guide pin(115). The lower part of the ascending and descending unit is equipped with a plurality of height-adjustable through-holes(135) and a stopper. |
