Iron manhole cover, has safety unit connected with fixation body for opposing displacement of body from flange clamping position towards flange releasing position, where unit cooperates with body or with flange in complementary form

摘要

The cover (2) has a framework (4) defining a central opening (20), and an insert (6) for closing the opening. A securing flange (12) of the insert is placed on the framework. A fixation body (14) fixes the flange on the framework. A safety unit (16) i.e. steel spring, is connected with the fixation body for opposing displacement of the fixation body from a flange clamping position towards a flange releasing position. The safety unit cooperates with the fixation body or with the flange in complementary form. The flange has a blocking surface co-operating with the safety unit.