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US 7,740,522 B2Granted
Knife sharpener
AssigneeNational Presto Industries, Inc.
InventorShane R. Walker
Life of this patent
Estimating the term…
Abstract
A motorized knife sharpener includes means of for sharpening heavy, medium, and fine blades at angles appropriate to the cutting edges of such blades.
Claims5
A knife sharpener, comprising:
- a housing assembly enclosing a grinding assembly, the grinding assembly including a motor and a plurality of grinding disc operably coupled to the motor with a rotating axle assembly;
- and
- a plurality of interchangeable blade guides, each interchangeable blade guide being individually connectable to the housing assembly, wherein each interchangeable blade guide corresponds to a specified sharpening application, each interchangeable blade guide including individual grinding stages, each stage corresponding to one of the grinding discs, and wherein each grinding stage defines a presentation angle of a blade to a side grinding surface of the corresponding grinding disc wherein each stage of the blade guide presents a different angle fro the other stages.
A method for sharpening a blade, comprising:
- providing a knife sharpener including a grinding assembly having a plurality of driven grinding discs;
- providing a plurality of individually interchangeable blade guides, each interchangeable blade guide including individual grinding stages, each stage corresponding to one of the grinding discs, and wherein each grinding stage defines a presentation angle of a blade to a side grinding surface of the corresponding grinding disc, wherein each stage of the blade guide presents a different angle fro the other stages;
- selecting the appropriate blade guide based on the blade to be sharpened;
- attaching the selected blade guide to the knife sharpener;
- and
- positioning the blade within the at least one grinding stage on the attached blade guide such that the blade is presented at a desired angle to a side grinding surface of the at least one grinding disc corresponding to the grinding stage.
3 more elements
Dependencies are inferred from the claim text.