PROBLEM TO BE SOLVED: To enhance attaching workability while achieving cost reduction by facilitating the attachment of a plurality of repair doors to a plurality of repair windows.SOLUTION: Repair window units 25 are respectively provided to two openings 42 of a disposal door and the respective repair window units include annular base frames attached to the peripheral edge parts of the openings, annular packings attached to the inner peripheral edges thereof, repair doors, hinge parts 48 provided to one end parts of the base frames, and lock parts 49 provided to the other end parts of the base frames. The openings and the repair window units are formed into a shape becoming point symmetry within a plane parallel to the disposal door centering around an intersection P of a vertical line V passing the intermediate position in the right and left direction between both openings and a horizontal line H passing the intermediate position in the up and down directions of both openings. The shaft of the hinge part is disposed in parallel with the surface of the disposal door. A release lever for releasing the closed state of the repair doors is provided to the lock parts and the operation direction for releasing the closed state of the release lever is set to the thickness direction of the disposal door.COPYRIGHT: (C)2014,JPO&INPIT【課題】複数の手入れ窓への手入れ扉の取り付けを容易にして、取り付け作業性を向上し、コスト低減を図る。【解決手段】処置扉の二つの開口部42に手入れ窓ユニット25がそれぞれ設けられ、各手入れ窓ユニットは、開口部の周縁部に取り付けられる環状のベース枠と、その内周縁に取り付けられる環状のパッキンと、手入れ扉と、ベース枠の一端部に設けられるヒンジ部48と、ベース枠の他端部に設けられるロック部49とを備え、開口部及び手入れ窓ユニットは、両開口部の間の左右方向の中間位置を通る垂直線Vと両開口部の上下方向の中間位置を通る水平線Hとの交点Pを中心として処置扉と平行な面内で点対称となる形状に形成され、ヒンジ部の軸は、処置扉の表面と平行に配置され、ロック部には、手入れ扉の閉止状態を解除する解除レバーが設けられ、解除レバーは、閉止状態を解除するための操作方向が処置扉の厚さ方向に設定されている。【選択図】図1
