Vacuum cleaner air flow sensing arrangement
US4342133A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1981 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Mar 12, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/34
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An air flow sensing arrangement is disclosed for use in a vacuum cleaner. A plenum chamber or cavity established by a first wall and a second wall is provided adjacent to a fan inlet with all air from a bag chamber being directed radially inward therethrough toward an aperture in the first wall communicating with the fan inlet. The second wall is provided with openings adjacent to its outer periphery so that air is proportionally directed into the cavity along a plurality of paths. An air distribution chamber is established by the second wall and a secondary filter is supported on the second wall. Air is distributed by the distribution chamber about an entire outer surface of a wall portion of the second wall so as to maintan a consistent proportion of air flow through the openings into the cavity in the event irregular filter clogging occurs. A flow sensing device including a pivoting vane having a magnet thereon is disposed within the cavity so as to be within a path of air flowing through the openings. Air impinging against the vane causes it to pivot in an arcuate path to indicate a predetermined air flow level. A switch means is mounted in a position so as to be tangential to …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.