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US 8,585,462 B2Granted
Precision sharpener for ceramic knife blades
AssigneeEdgecraft Corporation
InventorsGeorge C. Jensen, Daniel D. Friel, Jr., Samuel Weiner
Life of this patent
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AssigneeEdgecraft Corporation
InventorsGeorge C. Jensen, Daniel D. Friel, Jr., Samuel Weiner
Estimating the term…
An electrically powered knife sharpener for ceramic (or other brittle, crystalline or amorphous media which could be used for blades) knives includes at least one pre-sharpening stage with a sharpening member(s) and includes a final stage with a sharpening member(s). There are one or more motor driven shafts on which the abrasive surfaced sharpening members, such as disks, are mounted. Guide structure is provided to guide the knife for aligning and positioning the knife facet precisely at a defined location on the abrasive surface of each rotating sharpening member. The pre-sharpening stage sharpening member(s) moves in a first direction. The final stage sharpening member(s) moves in a second direction which differs from the first direction.
An electrically powered sharpener for sharpening the cutting edge of a cutting instrument having a blade with one or more facets which converge toward each other to form the cutting edge at their intersection, said sharpener having at least one pre-sharpening stage, at least one sharpening member having an abrasive surface with abrasive particles in said pre-sharpening stage, a final stage in said sharpener, at least one final stage sharpening member having an abrasive surface with abrasive particles in said final stage, and electrically powered drive structure for moving all of said pre-sharpening stage sharpening members in the same first direction from the edge into the blade to place the edge under compression and for moving all of said final stage sharpening members in a same second direction which differs from said first direction and which moves out of the edge to place the edge under tension.
A method of sharpening the hard and brittle cutting edge of a cutting instrument having a blade with one or more facets which converge toward each other to form the cutting edge at their intersection, comprising providing a sharpener having at least one pre-sharpening stage and at least one final sharpening stage with at least one abrasive surfaced pre-sharpening member with abrasive particles in the pre-sharpening stage and at least one abrasive surfaced final stage sharpening member with abrasive particles in the final stage, placing the hard and brittle cutting edge against the abrasive surface of the pre-sharpening member, moving all of the pre-sharpening members in a same first direction from the edge into the blade to place the edge under compression to pre-sharpen the cutting edge, removing the cutting edge from the first stage, placing the cutting edge against the abrasive surface of the final stage sharpening member, and moving all of the final stage sharpening members in a same second direction which differs from the first direction and which moves out of the edge to place the edge under tension to sharpen the cutting edge.
Dependencies are inferred from the claim text.