Noise reducing means for vacuum cleaner
US4435877A · kind A · utility
62Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1982 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | Sep 30, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L9/0081
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A noise muffler for a vacuum cleaner is constructed of flexible open cell foam inserts, one of which extends across an opening through which working air flows between two plenums. At this opening the foam insert is provided with a plurality of relatively large perforations. Similar perforations may be provided at the ends of the other insert, this other insert being in the downstream plenum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.