Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1996-10-28
1998-11-03
Biefeld, Diana
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
116271, 116276, A47L 900
Patent
active
058290931
ABSTRACT:
Disclosed is an indicator device for visually denoting the amount of filled dust in a dust container of a vacuum cleaner. The indicator device operates based on a vacuum pressure difference created between an air suction port and an outlet of the vacuum cleaner. When a vacuum pressure difference is created between the air suction port and the outlet of the vacuum cleaner, a disc-shaped colored film and a circular rotating member positioned in an upper cap of the indicator device receive an atmosphere air from the exterior of the indicator device and denotes the amount of dust filled in the dust container. For this purpose, a colored film is separated by 3.times.N (N is an integer) times and colored in three primary colors of light of red, green and blue or in three primary colors of red, yellow and blue. The user of the vacuum cleaner can notice the operating state of the vacuum cleaner or the replacement time of the dust container by observing the color change of the colored film through the transparent upper surface of the upper cap installed at a through groove formed at the hood of the vacuum cleaner and exposed to the outside of the vacuum cleaner.
REFERENCES:
patent: 4060050 (1977-11-01), Simonsson
Biefeld Diana
Daewoo Electronics Co. Ltd.
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