MANHOLE FOR PREVENTING INFLOW OF IMPURITIES

摘要

PURPOSE: A manhole is provided to prevent the inflow of impurities and to open and close a cover easily by preventing the movement of a cover. CONSTITUTION: The manhole for preventing the inflow of impurities contains an outward end projection(1) formed on the outer side of a cover to place a backing projection of a main body, a guide wall formed directly below the outward end projection(1) and provided with an inclined plane fitted with a projection of the main body to be slid and a movable hole with a setting hole for stopping the projection, a projected frame(9a) fitted to the backing end projection of the main body and formed on the front end of the guide wall, and an inclined frame(2) formed on the outside of the projected frame(9a) contacted with an upper side of the backing end projection.