DUST INDICATOR FOR A VACUUM CLEANER
First Claim
1. A dust indicator for a vacuum cleaner, said dust indicator being arranged in a wall at least partly defining a space of the vacuum cleaner that is set under negative pressure with respect to the outside of said wall during operation of the vacuum cleaner, said dust indicator comprising:
- an air channel having an air inlet arranged at an outer side of said wall, and an air outlet arranged at an inner side of said wall, said air channel thereby providing an airflow into said space during operation of the vacuum cleaner due to said negative pressure; and
a sensor arranged for detecting dust by means of sending and/or receiving an electromagnetic signal transmitted through said space, wherein said air channel is arranged such that said airflow prevents dust from sticking in an area of the path of the electromagnetic signal of said sensor; and
a transparent window behind which said sensor is arranged, thereby obtaining shielding of the sensor from dust and debris within said space.
1 Assignment
0 Petitions
Accused Products
Abstract
This invention relates to a dust indicator in a vacuum cleaner, which dust indicator (200) is arranged in a wall (102) at least partly defining a space of the vacuum cleaner that is set under negative pressure with respect to the outside of the wall during operation of the vacuum cleaner. The dust indicator comprises an air channel (211) having an air inlet (212) arranged at an outer side of the wall, and an air outlet (213) arranged at an inner side of the wall, such that an airflow is directed into the space during operation of the vacuum cleaner due to the negative pressure. The dust indicator further comprises a sensor (220) arranged for detecting dust by means of sending and/or receiving an electromagnetic signal which is transmitted through the space. The air channel is arranged such that the airflow prevents dust from sticking in an area of the path of the electromagnetic signal of the sensor. The sensor is arranged behind a transparent window (232) such that it is shielded from dust and debris within said space.
6 Citations
16 Claims
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1. A dust indicator for a vacuum cleaner, said dust indicator being arranged in a wall at least partly defining a space of the vacuum cleaner that is set under negative pressure with respect to the outside of said wall during operation of the vacuum cleaner, said dust indicator comprising:
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an air channel having an air inlet arranged at an outer side of said wall, and an air outlet arranged at an inner side of said wall, said air channel thereby providing an airflow into said space during operation of the vacuum cleaner due to said negative pressure; and a sensor arranged for detecting dust by means of sending and/or receiving an electromagnetic signal transmitted through said space, wherein said air channel is arranged such that said airflow prevents dust from sticking in an area of the path of the electromagnetic signal of said sensor; and a transparent window behind which said sensor is arranged, thereby obtaining shielding of the sensor from dust and debris within said space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification