Metal tools and implements – making – Tool sharpeners – Cutting
Reexamination Certificate
1999-08-04
2001-05-29
Watts, Douglas D. (Department: 3724)
Metal tools and implements, making
Tool sharpeners
Cutting
Reexamination Certificate
active
06237443
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a device for manually sharpening cutting tools, especially hand-held cutting tools, comprising a shaft-shaped supporting body being at least at one end provided with an edge indentation associated with a sharpening tool made of hard metal, a central tongue projecting into the edge indentation for forming lateral entering grooves for a tool to be sharpened terminating at the sharpening tool.
BACKGROUND OF THE INVENTION
A device of thus kind is known from DE-U 2 97 04 759. With this known arrangement, the sharpening tool is formed as a rectangular bar. The bar may be turned. However, the effective working length is limited to a comparatively small central area, since the bar must be held reliably. Therefore, the available effective working length is comparatively quickly worn out. Therewith, a comparatively short total tool life and therewith a comparatively bad material exploitation and altogether a bad economic efficiency results.
SUMMARY OF THE INVENTION
Starting from this, the problem to be solved by the present invention is to improve a device of the kind mentioned above with simple and cheap means in such a way that a long tool life is achieved.
The solution to this problem is achieved according to the present invention in a surprisingly simple way in that the sharpening tool is formed as a circular plate being rotatable about its axis and being arranged in the area of the inner end of the associated edge indentation with its axis being vertical to the plane of the edge indentation and the tongue projecting over the plate.
The sharpening plate used here may be used for sharpening over its total periphery. The effective working length therefor corresponds to the total length of the periphery and therewith to the total length of the available edge. This ensures a long tool life and therewith good material exploitation and good economic efficiency. Therefore, with the measures according to the present invention the disadvantages of the known arrangement are completely eliminated.
The tongue may advantageously be provided with at least one further entering groove for a tool to be sharpened. This tongue-sided entering groove is intersected by the sharpening plate under a comparatively obtuse angle and is therefore advantageously useful especially for sharpening cutting tools with a comparatively big intersection angle as is the case with e.g. scissors or other cutting dies. In contrast to this, the lateral entering grooves of the sharpening plate are intersected under a comparatively arcute angle and accordingly, are more suitable for sharpening cutting tools with a comparatively arcute intersection angle as e.g. with knife blades etc. Altogether, the mentioned measure therefore results in a sharpening head with universal usability.
A further advantageous measure may be that the plate forming the sharpening tool is arranged adjustably in the longitudinal direction of the edge indentation. Hereby, it is possible to change the angle under which the sharpening plate intersects the lateral flanks of the preferably inwardly widening edge indentation, thereby the geometrical dimensions may be adapted to the blade to be sharpened.
A further useful measure may be that the plate forming the sharpening tool is peripherally formed conically. This measure advantageously results in a sharp cutting whetting edge. This embodiment is advantageously possible because due to the big effective working length over the total periphery a possibility for turning of the plate may be omitted.
Further advantageous embodiments and useful modifications of the superior measures may be taken from the following description of examples by means of the drawings.
REFERENCES:
patent: 1573875 (1926-02-01), Shaw
patent: 24292 (1919-03-01), None
Jones Tullar & Cooper P.C.
Watts Douglas D.
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