Vacuum cleaner including automatic shutoff device
US4294595A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1980 |
| Grant date | Oct 13, 1981 |
| Priority date | — |
| Expiry date | Jul 18, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/03
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An automatic shutoff arrangement for a vacuum cleaner of the "clean air" type in which the vacuum fan is downstream of the dirty air passageway and vacuum filter. The automatic shutoff arrangement includes an apparatus for sensing a selected characteristic of the air flow at a first point adjacent the entrance to the dirty air passageway and at a second point along the clean air passageway between the vacuum filter and fan and operates in response to a relative change in the selected characteristic between such points to interrupt power to the vacuum motor and/or indicate to the operator that the dirty air passageway is obstructed or vacuum filter is full.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.