DEVICE FOR OPENING OPEN AND CLOSURE DOOR OF CRYOGENIC FREEZER

摘要

PURPOSE:To open an open and closure door of a cryogenic freezer easily when it has become difficult to open said door due to the reduction in the pressure in the freezer caused by pull down and the like. CONSTITUTION:An air-flow passage 5 for connecting the exterior and the interior of a freezer is provided in an open and closure door 1 and a needle valve 6 is provided in the passage 5 to open or close the passage 5 in association with the action of a grip of the door.