Nabco Limited

Hiroyuki Yokotachi

Yoshinori Hamada

A door system has a compartment formed with a first gateway and a second gateway opposed to the first gateway, and a barrier apparatus housed in the compartment. The barrier apparatus includes a swivel panel which swings back and forth between a first position where one surface of the swivel panel faces the first gateway, and a second position where the opposite surface of the swivel panel faces the first gateway. The barrier apparatus further includes a pair of door panels provided at the opposite ends of the swivel panel to move with the swivel panel. The door panels synchronously open the gateways when the swivel panel is at the first position and at the second position. Air sealing is provided between the compartment and the door panels.

Door system with a pair of door panels connected by a swivel panel that swings back and forth for selectively opening and closing gateways in a compartment

A revolving door system includes outer walls ( ) disposed in parallel with a doorway in a building. A hollow center core ( ) having a racetrack-shaped cross-section is disposed between the outer walls, whereby passageways are defined by the lower surface ( ) of a ceiling ( ), the floor, the center core and the outer walls. Upper and lower rails ( ) and ( ) are secured within the center core, and with which plural sets of upper and lower suspension devices ( ) and ( ) are movable engaged. A plurality of doors ( ) are supported by the upper and lower suspension devices. A pulling bar ( ) is linked to the upper suspension device for each door. The pulling bars are connected to a driving chain ( ) driven to move by a door driving arrangement. A carrier bar ( ) is connected to each upper suspension device, for rotatably supporting the upper portion of each door at a location near the center core. The lower portion of each door is rotatably supported by one of the lower suspension devices. An electromagnetic locking arrangement ( ) detachably holds the upper portion of each door with respect to the carrier bar at a location remote from the center core.

Growing community of inventors

Itabashi-ku, Japan

Hiroyuki Yokotachi