Blade Sharpener

Abstract

A blade sharpener including a frame casing body having a grip and a grinding chamber and a grinder assembly detachably installed in the grinding chamber in which the grinder assembly is formed by a grinder casing body having a pair of vertical walls facing each other, a supporting window provided in each of the vertical walls, a rotary shaft provided between the vertical end walls with both end thereof in the supporting windows of the vertical walls, an abrasive wheel provided on the rotary shaft at the axial center, and a pair of lateral coil springs each provided on either side of the abrasive wheel. The rotary shaft can be supported by a pair of longitudinal coil springs installed in the vertical walls.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a blade sharpener that sharpens blades such as kitchen knives and table knives with an abrasive wheel and more particularly to a manual blade sharpener having an abrasive wheel therein.[0003]2. Background Art[0004]Japanese Patent Application Laid-Open (Kokai) No. S62-181860 discloses a table knife sharpener that is comprised of a frame casing body, a adhesive wheel rotatably installed in this frame casing body and equipped with grinding surfaces that are of a truncated cone shape and forming an angle to each other, a guide part that guides the blade so that the blade being sharpened is pressed against both grinding surfaces, and a liquid vessel installed in the frame casing body so as to surround the bottom part of the abrasive wheel.[0005]In this device, two sides of the blade of a knife is pressed against the two sides of the grindstone and the knife is moved back and forth at a bias r...

AI Technical Summary

Benefits of technology

The present invention provides a blade sharpener that can prevent variations in the force of pressing the cutting edge against conical surfaces and can grind blades further evenly and smoothly compared to existing blade sharpeners. The grinding element of the blade sharpener is constantly urged by two lateral urging means or coil springs so that the blade receives lateral pressure from both sides by the urging means and makes good contact with the grinding element when the blade is moved back and forth with respect to the grinding element, resulting in sharpened blades efficiently. The blade further receives longitudinal pressure from four directions, making further good contact with the grinding element, and thus resulting in even greater sharpening efficiency.

Problems solved by technology

This device has problems, however.

During sharpening by the back and forth movements of the blade, frictional heat is generated, thus dulling the blade.

Grinding dust from the blade would clog the pores of the abrasive wheel.

Though the liquid vessel that contains liquid for cooling and cleaning the blade during the sharpening is provided, the problems of the frictional heat and clogging are not sufficiently solved.

Furthermore, since the abrasive wheel is fixedly provided in the frame casing body, it is difficult to wash and clean the abrasive wheel.

Pressing the blade too firmly will create defects in the cutting edge and can leave it to be able to cut less than before.

In addition, blades with serrated cutting edges and fine ceramic blades cannot be sharpened very well even with use of a diamond abrasive wheel for the grinding surface.

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