Electronic output circuit for vacuum cleaners
US4163999A · kind A · utility
16Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1978 |
| Grant date | Aug 7, 1979 |
| Priority date | — |
| Expiry date | Jan 9, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An upright vacuum cleaner having a brush roller rotatably driven by a belt from the cleaner motor and having a safety device for protecting the belt and motor when the brush rotation falls below a predetermined speed. The device includes a magnet in the brush roller, a rotation sensing circuit for generating a pulse for each revolution of the magnet and a motor shut-off circuit controlled by the sensing circuit to shut-off power to the motor when the pulse rate falls below that desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.