AIRTIGHT STRUCTURE OF ENTRANCE IN COVER WITH ASSEMBLED AT NECK OF VESSEL

摘要

PURPOSE: Provided is an airtight structure of an entrance in a cover with assembled at the neck of a vessel which forms an elastic airtight part at the upper part of the entrance so that it keeps airtightness efficiently at the cover requiring to switch more than two places. CONSTITUTION: The airtight structure of the entrance in the cover with assembled at the neck of the vessel is characterized by comprising the parts of: the elastic airtight part(102) which is formed at the entrance(101) of the cover(100) with having a circular wheel form and lowered downward to keep airtightness; and an airtight part for the entrance(103) which is closely placed at an airtight inner wall part of the cover to keep airtightness.