Patent ID: 6470949
Filing Date: 2002-10-29
Classification: F25D

Abstract:
A closure system for a refrigerated cold room whereinthe cold room has a door frame around and defining an entrance opening of the room and a wall around the door frame; an insulated access door supported at the frame and moveable between an open condition providing access to the entrance opening and a closed condition against the door frame for closing the entrance opening; a flexible sheet which is adapted to be extended and when extended to cover the entrance opening of the cold room and is adapted to be rolled up to open the entrance opening; and a drive device located near the entrance opening and connected with the sheet for moving the sheet between being rolled up and being extended over the entrance opening for minimizing temperature loss while the insulated access door is in the open condition; a protruding part protruding from the wall and near the door frame; an elongate slit in the door frame and at the protruding part and the slit being shaped, positioned and sized to permit the flexible sheet to pass through the slit as the sheet is moving between being extended and rolled up; the flexible sheet being guided in moving by passing through the slit to be one of in front of and behind the access door; the frame having an internal side at least one groove being defined in the internal side of the frame for guiding the sheet for movement between being extended and rolled up; a stopper positioned for closing the slit for minimizing temperature variations when the cold room is closed by the insulated access door.