Knife sharpener for asian and european/american knives
AssigneeEdgecraft Corporation
InventorsBela Elek, Daniel D. Friel, Sr.
Life of this patent
Estimating the term…
Abstract
A knife sharpener sharpens a wide range of knives and blades. The knife sharpener includes an angle guide associated with a first stage abrasive surface at an angle in the range of 12-18 degrees. A second stage is provided at an angle in the range of 17-23 degrees. A third stage is provided at an angle in the range of 19-25 degrees. The abrasive surface in the first and second stages is in the range of 240 to 400 grit while the abrasives in the third stage is in the range of 600 to 2000 grit.
Claims24
A precision manual knife sharpener for selectively sharpening with the same sharpener knives and blades representative of two widely different style of knives having different factory made primary edge facets established at widely different primary angle A and primary angle B, said sharpener comprising a first stage having a first stage disk with an abrasive surface for sharpening a first primary angle facet blade edge of a first knife, a first knife angle guide in said first stage to position the blade edge facet of the first knife into contact with said first stage abrasive surface to establish the first primary angle facet along the blade edge, said first stage guide located with respect to the first abrasive surface at an angle A which is in a range no greater than 18 degrees, said first stage abrasive surface having its abrasive surface from abrasives in the range of 240 to 400 grit, a second stage having a second stage disk with an abrasive surface for sharpening a second primary angle facet blade edge of a second knife, a second knife angle guide in said second stage to position the edge facet of the second knife into contact with said second stage abrasive surface to establish the second primary angle facet along the blade edge, said second stage guide located with respect to the second stage abrasive surface at an angle B which is greater than angle A, a third stage having a third stage disk with an abrasive surface for selectively sharpening the blade edge of the respective first knife and second knife to create a microscopic bevel at the tip of the blade edge of the respective first knife and second knife, a third knife angle guide in said third stage to position the blade edge facet into contact with said third stage abrasive surface, said third stage guide located with respect to the third stage abrasive surface at an angle C which is at least as great as the angle B of the second stage and which is at least 5 degrees greater than angle A of the first stage, and said third stage disk having its abrasive surface formed from ultra fine abrasives.
A sharpening element for sharpening knives that have a double faceted cutting edge comprising a pair of disk assemblies mounted and secured on a rotatable knurled shaft supported by appropriate bearings, each of said disk assemblies comprising a contoured plastic hub fitted and faced with a metal stamping coated with a single grit diamond abrasive and contoured to match the contour of the outer surface of said hub and shaped nominally on its said outer coated surface as a truncated cone, said assemblies being press-fitted onto said shaft with the smaller end of each disk assembly's abrasive coated metal stamping surface in nominal physical contact with each other so that the knife to be sharpened passes in contact simultaneously with the diamond abrasive surfaces on each assembly at a non-perpendicular angle to said shaft.
Dependencies are inferred from the claim text.