Method of detecting a missing pad for a floor polishing tool
US5298080A · kind A · utility
9Cited by
7References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1992 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Nov 19, 2012 |
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.