Dust disposal attachment for a rotary element of a power tool
US5074044A · kind A · utility
Inventors
Key dates
| Filing date | Apr 26, 1991 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Apr 26, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B55/102
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An attachment is provided for a saw or other power tool having a rotary shaft and a circular blade mounted on the shaft. A substitute saw blade guard is fastened on the saw housing to define a dust confining channel about the periphery of a portion of the circular rotary saw blade. A shaft extension is fastened to the exposed tip of the shaft and an impeller is fastened to the shaft extension outside of the dust confining channel. A bonnet with an internal dust transfer passageway is secured relative to the dust guard to confine the impeller within an impeller enclosure. Operation of the rotary blade causes the impeller to rotate to create a suction, thereby drawing air and dust from the channel about the periphery of the rotary blade and into the vortex created at the axial center of the impeller. The impeller discharges air laden with dust from a discharge outlet in the impeller bonnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.