Missing pad detector for a floor polishing tool
US5177828A · kind A · utility
16Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1991 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Aug 20, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L11/4072
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A surface treating tool such as a floor polisher and method and apparatus for detecting the absence of a pad or other surface treating member on the tool. In the preferred manner of operation, the invention monitors the amperes being drawn by an electric motor rotating the pad support. If the amperage draw during initial start up of the tool is less than a predetermined amount (representing the absence of a pad on the support), the tool is prevented from lowering the padless support into potentially damaging contact with the floor or other surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.