Entrance dust arrester
US4551879A · kind A · utility
2Cited by
6References
9Claims
0Family size
Inventor
Key dates
| Filing date | Oct 15, 1984 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Oct 15, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L9/02
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An entrance dust arrester is provided which vacuums the area directly under a door as the door is opened and closed, thereby preventing the tracking of debris into a clean area. A housing with downward facing vacuum apertures may be attached to the outside of the door or may be built into the door itself. A system of air directing vanes distributes the vacuum evenly. The vacuum source itself may be integral to the housing or may be external and connected by a moveable coupling. The vacuum source is turned on and off by either or magnetic reed switch or a pressure operated switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.