Air-tightly sealable container with bell jar covering

摘要

Provided by the invention is an air-tightly sealable bell jar container comprising a base plate and a bell jar covering mountable on the base plate. An air-tight sealing mechanism is obtained by forming a laterally and downwardly opening annular groove in the base plate to support an O-ring gasket of rubber and providing, below the base plate, a presser plate which presses up the O-ring gasket against the base plate by a means of cams or screw means in such a fashion that the O-ring gasket is elastically deformed and laterally bulged out to be brought into air-tight contacting with the inner wall of the bell jar covering surrounding the base plate.