WALL SURFACE-WASHING APPARATUS WITH EVACUATING-CUP

PURPOSE:To prevent the title apparatus from separating and falling from a wall surface, without breaking the adsorptive force of an evacuating cup even if a trouble occurs, by a formation wherein a check valve is provided between the evacuating cup and an ejector and air is allowed to flow only in the direction of the ejector from the evacuating cup. CONSTITUTION:For an evacuating cup 2, a suction air pipe line 14 for evacuation is connected thereto, following which both a compressed air source 8 such as a compressor and a nozzle 6 in an ejector 1 are also connected. The ejector 1 has the nozzle 6 and a diffuser 7, and the compressed air source 8 is connected to the side of the nozzle 6 through a compression air pipe line 9, and the evacuating cup 2 is connected to the side of the diffuser 7 through both the suction air pipe line 14 and the check valve 4, and thus a jet with high speed is ejected from the nozzle 6. Negative pressure is generated near the peripheral part of the nozzle 6, by the jet ejected from the nozzle 6, and the air in the evacuating cup 2 is sucked through both the check valve 4 and the suction air pipe line 14 and is discharged into the outside air together with the jet. In this way, the inside of the evacuating cup 2 is made at the negative pressure, and the evacuating cup 2 can be adsorbed on a wall surface such as a glass wall.