Abstract: A cover assembly for an opening comprises a frame and a covering. At least one elastically deformable, rod-like closing member, which extends substantially in a horizontal plane, is provided on the covering. The closing member forms one part of a locking device, the other part of which is a retaining member which includes a groove provided in the frame, in which can engage a closing finger of the closing member accompanied by an elastic bending of the closing finger in the horizontal plane.

Abstract: A frame for a manhole comprises a cylindrical pipe portion and an outwardly projecting lateral flange portion located on the outside of the pipe portion. Projections are provided on the inside of the portion and on these can be supported a cover or grating. The flange portion is constructed as a cohesive collar, which projects substantially horizontally outwards. The flange portion is located at a height below the upper border of the pipe portion. This height is a third to a half of the total height of the pipe portion. Due to the fact that the flange portion is spaced from the upper end of the pipe portion, during the installation of the frame, it is surrounded at all sides by the material of the ground surface, so that the frame is connected in stable manner to the ground material and cannot be significantly displaced by the traffic flow.