ILLUMINATION PLATE FALL PREVENTION DEVICE OF CEILING ILLUMINATION DEVICE OF ELEVATOR CAGE, CEILING ILLUMINATION DEVICE WITH THE SAME, AND METHOD FOR REMOVING ILLUMINATION PLATE OF CEILING ILLUMINATION DEVICE

PROBLEM TO BE SOLVED: To obtain an illumination plate fall prevention device of a ceiling illumination device of an elevator cage capable of simply updating an existing ceiling illumination device to a ceiling illumination device with a fall prevention mechanism of an illumination plate, the ceiling illumination device with the same, and a method for removing the illumination plate of the ceiling illumination device.SOLUTION: An illumination plate fall prevention device 14 comprises: a lower metal fitting 15 which is arranged on the top face of a ceiling 2; an upper metal fitting 16; a stud bolt 18 and a nut 20 which tighten and fix the upper metal fitting 16 to the lower metal fitting 15 at a state of being brought into contact with the bottom face of an illumination box; and a plate spring 17 having a presser part 17c which is energized in a direction separating from the lower metal fitting 15 to contact a side face of an illumination plate 11, and pressed in a direction approximating the lower metal fitting 15 to separate from the side face of the illumination plate 11, and a stopper part 17d which is projected in a direction separating from the lower metal fitting 15 from an upper end of the presser part 17c, separately located at an upper part of an outer peripheral edge of the illumination plate 11, blocks floating of the illumination plate 11, and is attached to the lower metal fitting 15. 【課題】この発明は、既設の天井照明装置を照明板の落下防止機構付きの天井照明装置に簡易に更新できるエレベータかご室の天井照明装置の照明板落下防止装置、それを備えた天井照明装置、および天井照明装置の照明板の取り外し方法を得る。【解決手段】照明板落下防止装置１４は、天井２の上面に配設される下取付金１５と、上取付金１６と、上取付金１６を照明ボックスの底面に当接させた状態で下取付金１５に締着固定するスタッドボルト１８及びナット２０と、下取付金１５から離反する方向に付勢されて照明板１１の側面に当接し、下取付金１５に近接する方向に押圧されて照明板１１の側面から離間する押え部１７ｃ、及び押え部１７ｃの上端から下取付金１５から離反する方向に突出され、照明板１１の外周縁部の上方に離間して位置して、照明板１１の浮き上がりを阻止するストッパ部１７ｄを有し、下取付金１５に取り付けられた板ばね１７と、を備えている。【選択図】図２