Sealing arrangement has sleeve made of air and watertight material rigidly fitted on one side of opening, and on other side sleeve is fastened to rotatable ring which when rotated twists sleeve and steplessly reduces internal diameter

摘要

The sealing arrangement comprises a sleeve made of air and watertight material which is rigidly fitted on one side of the opening to be sealed. The other side of the sleeve is fastened to a rotatable ring which when rotated twists the sleeve and steplessly reduces the internal diameter. Therefore, sealing is achieved regardless of whether an object is guided through the opening or not.