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AssigneeEdgecraft Corporation
InventorsBela Elek, Daniel D. Friel, SR., Daniel D. Friel, JR.
Estimating the term…
A sharpener for creating cross-grind knife edges includes a nominally flat annular abrasive sharpening member which could be a ring or a disk and is rotated about its center and held against a moving knife edge facet to simultaneously and sequentially abrade the knife edge at multiple locations on the abrasive member. The disk may be slidably mounted on a shaft in opposition to a spring restraining force. The disk is nominally disposed in a vertical orientation. The sharpener may include multiple stages including a manual stage having a pair of off axis conical shaped rotatable abrasive coated disks which have abrading lines on opposing facets which are not parallel but cross and intersect in a crossing pattern at the blade edge.
An electrical sharpener for a knife that has at least one cutting edge facet adjacent the knife face, said sharpener comprising an enclosing base and cover structure, at least one knife angle guiding slot with upper and lower knife guiding walls, an electrically powered motor, a nominally flat abrasive surfaced disk on a motor driven shaft, said disk held in a rest position by force of a spring yet slidingly displaceable when contacted by insertion of said knife into the knife angle guiding slot, the lateral displacement of said disk being limited by physical contact of the shoulder of the knife facet with the upper guiding wall of the knife guiding slot and without contact of the cutting edge with any of the guiding wall structure.
An electrical knife sharpener for a knife blade with at least one edge facet adjacent the knife face and its cutting edge, said sharpener comprising an electrical motor, a rotating nominally planar annular abrasive surfaced disk on a motor driven shaft, a knife angle guide to support the knife blade and position its edge facet at precisely the correct angle in contact with the surface of said annular abrasive ring as the knife edge facet is drawn across the rotating abrasive sections of said disk that will create a flat edge facet by contacting first on that area of the disk that grinds in a direction into the line of the cutting edge followed by grinding on that area that grinds in a direction out of the cutting edge being formed.
A combination electrical and manual knife sharpener for knives that have two edge facets adjacent the knife faces and joining to form a cutting edge, said sharpener comprising at least one electrical stage and one manual stage, the electrical stage comprising an electrical motor, at least one rotating nominally planar sharpening disk which is at least partially abrasive coated and mounted on a motor driven shaft, a knife angle guide to support the knife blade and to position its edge facet at precisely the correct angle in contact with the surface of said abrasive coated disk as the edge facet is drawn across the abrasive disk in a direction so that on each knife stroke the abrasive grinds into the knife edge followed by grinding out of the edge being formed, the manual stage comprising two truncated cone shaped sharpening elements and a knife guide, said truncated cone shaped sharpening elements being abrasive coated and mounted rigidly along their central axis on a common freely rotatable shaft with their smaller end surfaces juxtaposed, and said knife guide being positioned to align the line of knife edge motion at an angle to the axis of said rotatable shaft.
A manual knife sharpener for sharpening a knife having two edge facets adjacent the knife edge, said sharpener comprising a sharpening assembly and a knife guide, said sharpening assembly comprising two nominally truncated cone shaped diamond abrasive coated sharpening elements fastened rigidly along their central axis onto a common freely rotatable shaft with their smaller end surfaces juxtaposed said knife guide mounted to direct the knife edge facets into contact with the conical surface of the two sharpening elements with said edge aligned at an angle of approximately 70-80 degrees relative to the axis of the common shaft of the sharpening elements so as to cause said conical surfaces to rotate and abrade said facets as the knife is moved back and forth in said guide.
A method of creating a cross-grind knife edge of a knife blade comprising inserting the knife blade into a slot in a first stage of a combination electrical and manual sharpener, the first stage being an electrical stage and a second stage being a manual stage, the first stage having at least one rotating nominally planar sharpening disk mounted on a motor driven shaft, the sharpening disk being at least partially abrasive coated, disposing the knife blade against an angle guide in the first stage to precisely position an edge facet of the knife blade at precisely the desired angle in contact with the surface of the rotating disk in a direction so that on each back and forth stroke of the knife blade in the first stage slot the abrasive grinds into the knife edge followed by a grinding out of the edge being formed to create a cross grind pattern on the edge facet, removing the knife blade from the first stage slot and then inserting the knife blade into a slot in the second stage, the second stage having two truncated-cone shaped sharpening elements which are abrasive coated and mounted rigidly along a central axis on a common freely rotatable shaft with their smaller end surfaces juxtaposed, placing the knife blade against a guide to align the line of knife edge motion at an angle of about 70-80 degrees to the axis of the freely rotatable shaft, moving the knife blade across the abrasive surfaces of the sharpening elements to create abrading lines on opposing facets of the knife blade edge which intersect in a crossing pattern at the edge and establishing a cross grind edge configuration, and removing the knife blade from the second stage slot.
Dependencies are inferred from the claim text.