Sealing system for manhole covers comprises profile frame fitting loosely against manhole rim, base of profile frame having grooves in its upper and lower surfaces, in which rubber cords are mounted of greater diameter than depth of grooves

摘要

The sealing system for manhole covers comprises a peripheral profile frame (4) which fits loosely against the manhole rim (2). The base of the profile frame has circumferential grooves in its upper and lower surfaces (5, 6), in which rubber cords (7, 8) are mounted which have a greater diameter than the depth of the grooves.