Abstract: A sliding door capable of permitting both initiation of a door opening operation and termination of a door closing operation to be smoothly and readily accomplished. During the door closing operation, obliquely downward and inward movement of a door body and an action of a link cooperate with each other to permit the door body to be pressedly contacted with an outer wall surface of an object such as a refrigerator using substantially reduced force. During the door opening operation, upward outward movement of the door body and an action of the link permit the door body to be readily released from the outer wall surface using significantly reduced force.

Abstract: A sliding door adapted to operate an entrance of a large-sized freezer or the like and capable of facilitating operation at the initial stage of opening of the door. Upward elastic force of elastic suspensions constantly acts on a door body, so that the door body may be suspended while being raised from a floor, when the door is kept at an open position. Also, when the entrance is kept closed with the door, a driving wheel strikes on a tapered section of a lower rail surface to cause a bottom packing of the door body to be pressed on the floor against upward elastic force of the suspensions.

Abstract: A regulator of air pressure within a hot or cold storage chamber which comprises a damper and frames. The damper is disposed within an opening provided at a wall of the storage chamber defining an air passage, and the frames are airtightly in contact with peripheral surfaces of the opening and the damper at the inside and outside of the storage chamber to close the air passage. The damper and either one of the frames are moveable in the inside or outside direction of the storage chamber in accordance with variations of air pressure within the storage chamber to thereby release the sealing of the air passage and establish pressure equilibrium between the inside and outside of the storage chamber.

Abstract: A regulator of air pressure within a hot or cold storage chamber which comprises a damper and frames. The damper is disposed within an opening provided at a wall of the storage chamber defining an air passage, and the frames are airtightly in contact with peripheral surfaces of the opening and the damper at the inside and outside of the storage chamber to close the air passage. The damper and either one of the frames are moveable either inside or outside direction of the storage chamber in accordance with variations of air pressure within the storage chamber to thereby release the sealing of the air passage and establish pressure equilibrium between the inside and outside of the storage chamber.