Patent ID: 8206199

Claim:
An electric abrasive sharpener for sharpening edges comprising a housing supporting a pair of interconnecting abrasive wheels mounted for rotatable movement in a sharpening slot formed at the top of said housing, each of said abrasive wheels respectively having a raised helical thread extending in a radial direction continuously generally along the length of said abrasive wheels, a portion of one of said helical threads being disposed between two portions of the other of said helical threads during rotation for contacting the edges, a power drive connected to said pair of abrasive wheels for rotation in opposite directions about respective longitudinal axes, said helical threads having initial thread portions at each end of said abrasives wheels, said initial thread portions of said helical threads having peripheral edges, and said peripheral edges of said initial thread portions being substantially beveled along a plane intersecting said respective axes of rotation to form respective lead-in and lead-out chamfers to reduce kick-back of the edges being sharpened.