Carpet spotting machine with thermostatic protection against overflow
US5784753A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Dec 26, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L11/4061
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A portable carpet cleaning machine has a tank for storing a cleaning solution and a hand-actuatable spray nozzle for applying the solution under pressure. A vacuum motor drives a fan which produces a vacuum in a recovery tank for storing spent solution. Air flows through the recovery tank and the vacuum fan to exhaust. A fast-acting, heat-sensitive thermostatic switch is connected in electrical circuit and in heat transfer relation with the vacuum motor winding to interrupt the flow of current in the motor winding immediately upon sensing a temperature rise in the winding above a predetermined temperature and in a very short time after overflow water is passed from the recovery tank to the vacuum fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.