Abrading – Machine – Rotary tool
Reexamination Certificate
2000-02-16
2001-09-18
Hail, III, Joseph J. (Department: 3723)
Abrading
Machine
Rotary tool
C451S486000, C451S555000
Reexamination Certificate
active
06290582
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to sharpening devices, and in particular to devices for sharpening tools with cutting edges, preferably knives.
HISTORY OF THE RELATED ART
There exists a variety of more or less complicated devices for sharpening knives, ranging from devices for industrial use, to devices for domestic use. The present invention relates to a sharpening device which is particularly well suited for easily and efficiently providing a sharp cutting edge on tools having such edges which, moreover, produces a predetermined edge angle, and which may be used equally well for industrial purposes, as for domestic purposes.
Even though the invention is primarily directed towards sharpening tools with cutting edges, it is appreciated that it may be used for sharpening or grinding other types of edges, e.g. edges on plates, on which there still remains rough edges after cutting operations and the like.
For manual sharpening of tools with cutting edges, everything from grinding machines with discs or belts, to simple sharpening stones for example. The sharpening machines do in this respect have the disadvantage of being difficult to operate, and demanding a certain skill, while the sharpening stones or the like, are too inefficient to be a rational alternative. Further, the fact that sharpening machines produce a plane or concave surface in the transition between the blade and the cutting edge, while the optimal shape is slightly convex, also constitutes a problem. It is also a problem, for conventional sharpening devices, to sharpen equally much on both sides of the cutting edge tool, and thus center the cutting edge.
The present invention aims at solving the above stated problems, and to provide a simple and inexpensive sharpening device, which can be used without skill.
SUMMARY OF THE INVENTION
The invention, and that, which in particular characterises it, is apparent from the appended patent claims.
The invention will be described in closer detail in the following, with reference to the appended drawings, in which,
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Hail III Joseph J.
Jenkens & Gilchrist A Professional Corporation
Ojini Anthony
Telefonaktiebolaget LM Ericsson
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