HARD COATING CLEANER Russian patent published in 1995 - IPC

FIELD: cleaning facilities. SUBSTANCE: machine for vacuum cleaning of hard coatings has fan 7 connected with hermetically sealed bin 3 and blow-off nozzle 11, suction nozzle 14 coupled with bin 3 and air filter opened into atmosphere. Filter made in form of porous walls 12 of delivery air duct is installed between fan 7 and blow-off nozzle 11. Porous walls 12 of delivery air duct are hermetically mounted on rigid frame 10 arranged inside delivery air duct. Porous walls 12 of air filter are flexible and interconnected inside delivery air duct by means of flexible members 15, for instance, extension springs, to provide possibility of increase of inner space and surface of delivery air duct under action of gauge pressure and self-sustained oscillations of porous walls. Additional spaces 16 are formed between flexible walls 12 of filter and rigid frame 10 of delivery air duct. EFFECT: enhanced quality of cleaning. 4 cl, 1 dwg