Vacuum cleaner
US5365633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1991 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | Apr 18, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L9/0081
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A vacuum cleaner including an electric blower disposed inside a generally cylindrical rigid blower casing positioned inside the vacuum cleaner body. The blower casing has a lining of sound absorbing material and is configured to cause a swirling flow around inside the casing to an exit opening into a smoothly-curved transfer passage which curves away from the blower casing with a non-radial flow direction. The transfer passage curves circumferentially and axially and opens into an annular noise reduction space at the bottom of the cleaner body in which air is guided over a sound absorbing layer by smoothly arcuate guide ribs, vented through an aperture into an exhaust space between the bottom of the body and a caster base and escapes through a peripheral clearance around the caster base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.