Manhole cover frame with adjustable level - has telescoping parts and rests in seating groove filled with granular material

摘要

The manhole cover frame height is readily adjustable. This frame supports covers of the roads, domestic and agricultural yard draining systems. The frame has two separate components (1, 2) which move telescopically in each other. The upper part (1) height is adjusted by filling the groove in the lower part (2) to the required extent. The height adjustment can be made by using sand as filling material. Gravel also can be used or alternatively steel balls. Another filling material is plastics balls or standard size cast iron rings, which can also be made from plastics.