A device for opening the covers of considerations placed at ground level, in particular of the inspection of the manholes sewer

摘要

In the cover (9) for closing inspection orifices of sewage systems and the like, there is fastened perpendicularly to its surface a tube (19) which engages telescopically into a tube (23) mounted on the ceiling (1) of the sewage system. Inserted inside the tubes (19, 23) is a spindle (27), by means of which the cover (9) can be lifted out of the frame (5) of the orifice (3) and pivoted by means of a key (35) guided through the coaxial tubes (19, 23). The idle stroke of the spindle (27) preceding the stroke makes it possible to clean the spindle-key extension (31) easily. IMAGE