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US 4,285,253 AGranted
Mechanical steel for sharpening blades
OwnerTheodore L. Edlinginventor
Life of this patent
Estimating the term…
Abstract
A fine smooth finish can be obtained on blades without grinding by drawing them against a rotating hardened disk with a smooth peripheral edge. One or a pair of hardened disks having smooth, rounded peripheral edges being disposed adjacent to and partially received by knife-guiding structure, having rotation imparting drive. The use of smooth edged hardened disks enables a very fine finished edge to be obtained, similar to the edge resulting from the use of a hand held steel, and often better.
Claims9
A mechanical steel comprising:
- a hardened disk of a hardness substantially equal to or greater than the hardness of knives to be sharpened, said disk having a smooth transversely rounded peripheral edge,
- drive means for rotating said disk about its axis, and
- sloped knife-guiding means disposed to partially receive said disk, the slope of said knife-guiding means forming an angle of substantially 40 degrees with a tangent to the disk at the point where its rotation exits the area where the disk is received in the knife-guiding means.
A mechanical steel for sharpening blades which comprises:
- a pair of coplanar hardened disks each having a smooth transversely rounded peripheral edge,
- drive means for rotating said disks in directions opposite to each other, so that the direction of rotation of each disk is upward at the points where they are nearest to each other, and
- hardened knife-guiding means disposed between and separating said disks.
Dependencies are inferred from the claim text.