Door device with pressure difference mitigating mechanism

A door device with pressure difference mitigating mechanism, comprising:

• a door divided into a hanging door portion and a door-end door portion pivotally supported by the hanging door portion;
• a handle for opening and closing the door;
• a door closer;
• a hinge closer for supporting and rotating the door-end door portion with respect to the hanging door portion and having a pressure in a closing direction,
• a first latch for latching the door-end door portion to a door frame;
• and
• a second latch for latching a left side of the door-end door portion to a right side of the hanging door portion,
• wherein
• relationships
• DH<AH+LBH
• PAH+DHC>PBH+AH+LBH
• are satisfied in which
• DH is a door opening force at a handle position required to overcome a door closing force of the door closer,
• DHC is the door closing force at the handle position required to overcome the door opening force of the door closer,
• AH is the door opening force at the handle position required to overcome the door closing force of the hinge closer,
• LBH is a force at the handle position required to overcome a releasing force of the latch B,
• PAH is a load acting in the closing direction on the door at the handle position by a pressure difference, and
• PBH is a load acting in the closing direction on the door-end door portion at the handle position by the pressure difference,
• and wherein
• one side of the hanging door portion defines a notched opening and upper and lower bearing portions,
• a stepped contracted portion of the door-end door portion is fitted in the notched opening and the door-end door portion is pivotally supported by the hinge closer, and
• a rotating shaft of the door-end door portion pivotally supported by the hanging door portion is not made eccentric but is set at a center of the door-end door portion, and
• the second latch is a roller catch or a magnet catch.