To realize a suction port exhibiting a high dust suction force even if an air suction force is comparatively small.
Pressure holding blades 148 provided at the front edge part of an air suction port 125 opening in a horizontally long form at the bottom surface of a suction port main body 104 are divided to be plural, arranged in a line at intervals and suspended. The respective pressure holding blades are installed in a tilting state where the center side in a horizontal direction is positioned backward so as to approach the front edge of the air suction port and an outer side is positioned forward so as to move away from the front edge of the air suction port 125 to tilt forward and backward. Thus, an air suction stream is made to be smooth.
HAYASHI SHOJI
KITAGAWA TADASHI
SATO SUSUMU
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