Blade sharpener
US5009040A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1990 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Aug 17, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24D15/084
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A blade sharpener having a sharpening mechanism which functions to sharpen a blade engaging that mechanism and being moved longitudinally relative thereto. The sharpener also includes sharpening defeating means which, when operative, at least inhibits and possibly prevents sharpening of a blade by the sharpening mechanism when that blade is moved longitudinally through the sharpener in one direction. The defeating means is responsive to blade movement so as to adopt an operative condition when the blade is moved in the aforementioned one direction, and to adopt an inoperative condition when the blade is moved through the sharpener in the opposite direction. The defeating means includes a blade engaging member such as a roller, and in the operative condition that roller engages and presses against the cutting edge of the blade so as to impose a force on the blade which acts counter to the force causing the blade to engage the sharpening mechanism. The counter force therefore tends to push the blade out of contact with the sharpening mechanism. The roller does not engage the blade, or at least does not apply the counter force, when the defeating means is in the inoperative condition.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.