Abrading – Machine – Reciprocating tool
Reexamination Certificate
1999-03-23
2001-02-13
Eley, Timothy V. (Department: 3723)
Abrading
Machine
Reciprocating tool
C451S170000
Reexamination Certificate
active
06186874
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates in general to knife sharpeners and more specifically, to a blade sharpening apparatus capable of sharpening knives having serrations or having flat edges.
2. Description of the Prior Art
Typically, knives for many uses are constructed with a blade having either a serrated cutting edge or a flat edge. A serrated edge is particularly difficult to sharpen. Because of the nature of a serrated edge of a blade and its possible range of dimensions, known sharpener devices have not been able to satisfactorily sharpen both a serrated edge of a wide range of sizes and a straight edge in an effective manner. Prior sharpener designs have required that the sharpening stone be replaced by other stones in order to sharpen either a serrated edge, accommodate all sizes of serrations, and also sharpen flat edges. Known sharpeners also have a tendency to operate at high speeds that can cause heat build up and remove the temper of the knife blade. Past known devices are further deficient in providing a guide that permits sharpening to occur at optimum angles. Accordingly, there is a need in the prior art to provide an improved knife sharpener capable of sharpening knives having serrated edges of all sizes and flat edges as well in an efficient and effective manner.
SUMMARY OF THE INVENTION
It is, therefore, an objective of this invention to provide an improved blade sharpening apparatus capable of sharpening knives and the like having serrated edges of all sizes and flat blades. The invention of the application includes sharpening stones having an unique triangular configuration of equal sized faces that allow for superior sharpening of serrations and that allow the stones to be rotated to extend wear. The stones are moved in a back and forth stroke by an improved drive mechanism to assure superior sharpening. A slidable blade guide allows the user to select a coarse stone for initial edge sharpening or to repair damaged edges or alternatively, a fine stone to grind a final finished edge on the knife or to sharpen already sharp knives. The slidable guide also acts to provide a guide surface to sharpen a blade at an optimum angle. The knife sharpener of the invention is portable in nature and can be powered by batteries or other sources of electrical potential.
REFERENCES:
patent: 3956856 (1976-05-01), Yonkers
patent: 4231194 (1980-11-01), Glesser
patent: 4468894 (1984-09-01), Hong
patent: 4850149 (1989-07-01), Phillips
patent: 5005319 (1991-04-01), Friel
patent: 5245791 (1993-09-01), Bigliano et al.
patent: 5620359 (1997-04-01), Harrison et al.
patent: 5759093 (1998-06-01), Rodriguez
Eley Timothy V.
Gilhooly Edward D.
Nguyen Dung Van
Smith Abrasives Inc.
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