Indicator device for a vacuum cleaner dust container which has an additional pressure controller

摘要

Disclosed is an indicator device for visually in detail denoting the amount of filled dust in a dust container of a vacuum cleaner with time. The indicator device operates based on a vacuum pressure difference created between an air suction port and an outlet of the vacuum cleaner. A first plunger and a second plunger slidablely positioned in a first cylinder primarily decrease the vacuum degree in a dust collecting compartment and continuously display the amount of filled dust in the dust container. For this purpose, the first plunger is colored red and the second plunger is colored green. A third plunger slidablely positioned in a second cylinder secondarily decreases the vacuum degree in a dust collecting compartment. 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 first plunger and the second plunger through a transparent window installed at a hood of the vacuum cleaner.