Dust indicator for a vacuum cleaner
US9095244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2011 |
| Grant date | Aug 4, 2015 |
| Priority date | — |
| Expiry date | Jun 28, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L9/2894
- WIPO fieldFurniture, games
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.