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US 4,723,375 AGranted
Device for sharpening knives
AssigneeFiskars Inc.
InventorOlavi Linden
Life of this patent
Estimating the term…
Abstract
A device for sharpening knives, comprising a frame and a grinding element rotatably mounted in the frame. The grinding element is provided with two cone-shaped grinding surfaces turned towards each other. The cone angle of the grinding surfaces varies in the peripheral direction of the grinding element, with at least one portion with a small cone angle having a rougher surface than the portion having a wide cone angle.
Claims13
A device for sharpening knives, comprising:
- a frame;
- a grinding element rotatably mounted in the frame;
- said grinding element comprising first and second truncated cone-shaped grinding surfaces extending in a peripheral direction disposed to form an angle with each other;
- and
- means for steering a knife into contact with said grinding surface so that, during the sharpening process, the knife bears against both of said grinding surfaces;
- said grinding surfaces having cone angles varying in the peripheral direction of said grinding element, and including at least one portion having a relatively small cone angle and a rougher surface than portions of the surface having a wider cone angle.
3 more elements
A device for sharpening knives, comprising:
- a frame;
- a grinding element, rotatably mounted in said frame, said grinding element comprising first and second truncated cone-shaped grinding surfaces, disposed to form an angle with each other;
- each of said grinding surfaces defining a plurality of cone angles including at least one portion having a relatively rough surface and at least one portion having a relatively smooth surface, the cone angle of said rough surface portion being less than the cone angle of adjacent portions of said grinding surface;
- and
- means for steering a knife into contact with both said grinding surfaces.
2 more elements
Dependencies are inferred from the claim text.