Shut-off device for cyclonic vacuum cleaner
US5062870A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1990 |
| Grant date | Nov 5, 1991 |
| Priority date | — |
| Expiry date | Jul 6, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/03
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A dual cyclonic vacuum cleaner device (10) including outer cylcone (11), inner cyclone (12), collecting receiver (13) and motor (14) and a valve (46) in a housing (38) which preferably closes a passage into an inlet scroll (27) leading to the inner cyclone when the outer cyclone is full is described. The valve rises to meet a ring stop (47) to cause the closure because of the differential pressure (.DELTA.P) between a pressure at an opening (45) and a pressure inside of the housing. The valve (46) prevents dirt laden air from entering directly into the shroud 31 which could plug the inner cyclone, put dirt in the vacuum motor and expel dirt laden air to the atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.