Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1979-01-05
1980-03-18
Goldberg, Gerald
Measuring and testing
With fluid pressure
Porosity or permeability
116268, 116DIG25, G01L 708, B01D 4604
Patent
active
041932927
ABSTRACT:
An indicating device for vacuum cleaners, or similar apparatus, utilizing a dust container. The indicating device such as a diaphragm, is under the influence of a pressure differential and is movable against a force of a spring to give a visual indication from the outside of the vacuum cleaner of the degree of filling of the dust container therein. The motor of the vacuum cleaner has a motor regulator and the overall arrangement is provided with a unit for continuously varying the tension of the spring against the force of which the indicating device is movable.
This invention relates to an indicating device for vacuum cleaners or similar apparatus having dust container with means which under the influence of a pressure differential is movable against the force of a spring and has a signalling device visible from the outside of the means for continuous visual indication of the degree of clogging of the dust container.
REFERENCES:
patent: 3279418 (1966-10-01), Nilsson
patent: 3474906 (1969-10-01), Tennis
patent: 4060050 (1977-11-01), Simonsson
patent: 4070170 (1978-01-01), Leinfelt
Aktiebolaget Electrolux
Goldberg Gerald
Miller Alfred E.
Roskos Joseph W.
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