Electric vacuum cleaner with window for viewing belt
US4392271A · kind A · utility
17Cited by
2References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Sep 21, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L9/0444
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An electric vacuum cleaner has a generally opaque housing enclosing a bruch roller rotatable about a horizontal axis, a motor, and a belt or the like extending from the motor to a pulley on or affixed to the brush roller, for driving the brush roller. A transparent window is provided in the top of the housing and aligned with the belt, and highly contrasting markings are provided on the belt, thereby to enable an operator to determine, viewing the belt through the window, the moving condition of the belt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.