GB2307657A

GB2307657A - Edge tool grinding stone

Info

Publication number: GB2307657A
Application number: GB9624848A
Authority: GB
Inventors: Hidemi Shiroyama
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-01
Filing date: 1996-11-29
Publication date: 1997-06-04
Also published as: FR2741829A1; GB9624848D0; JP3027865U; FR2741829B3; JP3029992U

Abstract

The edged tool grinding stone is formed such that fine powder of an abrasive material is provided on a grinding surface of a natural grinding stone or of an artificial grinding stone such as a ceramic grinding stone, vitrified grinding stone, silicate grinding stone, rubber grinding stone, resinoid grinding stone, shellac grinding stone and metal bond grinding stone to be able to grind an edged tool by the grinding stone via water and the abrasive fine powder. The abrasive fine powder is preferably to be emery which is fine powder of garnet, emery which is powder of a blend of corundum, magnetite and quartz or fine powder of ceramics. As grinding progresses the powder becomes finer hence functioning as a range of grinding stone grades from rough to finish.

Description

EDGED WOL GRINDING STONE BACKGROUND OF THE DEVICE Field of the Device: The present device relates to a grinding stone for grinding various edged tools and more particularly to an edged tool grinding stone used for grinding Japanese and Western knives.

Description of Related Art: Generally, edged tools and various hard goods are ground by using a grinding stone. Among grinding stones, there are natural grinding stones and artificial grinding stones which are used properly in accordance to their use.

For example, a natural grinding stone contains hard and fine abrasive grains dispersedly within a relatively soft rock. When such a grinding stone is used to grind an edged tool, the surface of the edged tool is shaved off little by little by the abrasive grains and in the same time, the abrasive grains also loose their bite and fall off from the stone. Then, new abrasive grains appear one after another, shaving off the surface of the edged tool.

Further, fine particles of the abrasive grains fallen off from the stone enter the gap between the shaved edged tool and the stone and supplement the grinding effect, sharpening the cutting edge of the edged tool further. The cutting edge may be sharpened by grinding the edged tool by the grinding stone (natural grinding stone or artificial grinding stone) as described above.

While edged tools are ground thus by using natural grinding stones or artificial grinding stones, those natural and artificial grinding stones may be categorized roughly into a rough grinding stone (including a semi-rough grinding stone), a semi-finishing grinding stone and a finishing grinding stone (including a super-finishing grinding stone).

The rough grinding stone has coarse abrasive grains and is used mainly for shaping an edged tool which has been deformed during its use. It can quickly abrade the surface of the edged tool and is used first in girding the edged tool.

The semi-finishing grinding stone has abrasive grains having medium coarseness and hardness and is used for smoothing the cutting edge where rough streaks caused by the rough grinding stone remain.

The finishing grinding stone has fine and hard abrasive grains and is used to eliminate streaks on the cutting edge caused by the semi-finishing stone, thus finishing like a mirror.

Although the rough grinding stone having the coarse abrasive grains described above can quickly grind the edged tool, deep streaks remain on the surface of the edged tool, causing a significant irregularity on the cutting edge.

Further, although the semi-finishing grinding stone and the finishing grinding stone have finer abrasive grains and can grind the cutting edge finely, their grinding speed is slow.

Then, edged tools have been used to be ground by sequentially switching at least three types of grinding stones including the rough grinding stone, semi-finishing grinding stone and finishing grinding stone as described above to sharpen a cutting edge thereof.

That is, edged tools such as knives and scissors had to be ground by switching at least three types of grinding stones of the rough grinding stone, semi-finishing grinding stone and finishing grinding stone, by roughly grinding the edged tool by the rough grinding stone at first, then performing the semi-finish grinding by the semi-finishing grinding stone and finally finishing the grinding of the edged tool by the finishing grinding stone.

Accordingly, it is an object of the present device to solve the aforementioned problem by providing an edged tool grinding stone which eliminates the necessity of grinding various edged tools by sequentially using at least three types of grinding stones of the rough grinding stone, semifinishing grinding stone and finishing grinding stone and allows them to be ground continuously and effectively from rough grinding to semi-finish grinding and finish grinding by one type of grinding stone.

SUMMARY OF THE DEVICE In order to achieve the aforementioned object effectively, an edged tool grinding stone of the present device is formed such that fine powder of an abrasive material is provided on a grinding surface of a natural grinding stone or of an artificial grinding stone such as a ceramic grinding stone, vitrified grinding stone, silicate grinding stone, rubber grinding stone, resinoid grinding stone, shellac grinding stone and metal bond grinding stone to be able to grind an edged tool by the grinding stone via water and the abrasive fine powder.

As for the abrasive fine power in the present device, while there is no particular limit so long as it can be used as an abrasive material, it is preferable to be emery of fine powder of garnet, emery which is powder of a blend of corundum, magnetite and quartz or fine powder of ceramic.

The above and other advantages of the device will become more apparent in the following description and the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of an edged tool grinding stone; and FIG. 2 is a perspective view showing a state of use of the edged tool grinding stone.

MODE FOR CARRYING OUT THE DEVICE A mode for carrying out the present device will be explained with reference to FIGs. 1 and 2.

FIG. 1 is a perspective view of an edged tool grinding stone and FIG. 2 is a perspective view showing a state of use of the edged tool grinding stone. In the figures, the reference numerals 1 and la denote a natural grinding stone or an artificial grinding stone such as a ceramic grinding stone, vitrified grinding stone, silicate grinding stone, rubber grinding stone, resinoid grinding stone, shellac grinding stone and metal bond grinding stone.

The natural grinding stone 1 is what a relatively soft rock contains hard and fine abrasive grains dispersedly, as described before.

The ceramic grinding stone, i.e. the artificial grinding stone la, is what allows an edged tool to be ground quickly as no water nor oil infiltrate and is what wears less.

The vitrified grinding stone, i.e. the artificial grinding stone la, is what uses clay as a binder and is formed and sintered by blending an abrasive material with the binder.

The silicate grinding stone, i.e. the artificial grinding stone la, is what uses water glass as a main component of a binder and is formed by blending an abrasive material with the binder.

The rubber grinding stone, i.e. the artificial grinding stone la, is what uses natural rubber as a binder and is formed by blending an abrasive material with this binder.

The resinoid grinding stone, i.e. the artificial grinding stone la, is what uses phenol resin or thermosetting resin as a binder and is formed by blending an abrasive material with this binder.

The shellac grinding stone, i.e. the artificial grinding stone la, is what uses natural resin as a binder and is formed by blending an abrasive material with this binder.

The metal bond grinding stone, i.e. the artificial grinding stone la, is what is formed by combining diamonds with bronze, steel, nickel or the like.

The edged tool grinding stone A is formed by providing abrasive fine powder 3, i.e. emery 3a which is fine powder of garnet, emery 3b which is powder of a blend of corundum, magnetite and quartz or ceramic fine power 3c in concrete, in a manner of sowing on a grinding surface of a finishing grinding stone, shown in the figures, which is the natural grinding stone 1 or one of the various artificial grinding stones la described above.

In the edged tool grinding stone A of the device formed as described above, a grain size of the fine powder 3 (3a, 3b, 3c) sowed on the grinding surface 2 is coarse at first and an edged tool 4 may be ground roughly at first by abutting and grinding it with the grinding stone 1 via the abrasive fine powder 3 (3a, 3b, 3c) while pouring water.

As the grinding advances, the coarse fine powder 3 (3a, 3b, 3c) becomes fine and the edged tool 4 may be ground as if it is ground by a semi-finishing grinding stone (not shown). When the edged tool 4 is ground further, the fine powder 3 (3a, 3b, 3c) becomes such fine granular powder that the edged tool 4 may be sharpened to the degree of shining the surface of the cutting edge as if it is ground by a finishing grinding stone (not shown).

Finally, the ground edged tool 4 is washed by water to wash off the refined abrasive fine powder 3 (3a, 3b, 3c), thus completing the grinding of the edged tool 4.

As it is apparent from the above description, the edged tool grinding stone of the device allows the grinding works of the rough grinding, semi-finish grinding, and finish grinding to be done by one grinding stone and the ground edged tool to be regenerated as a shiny and keenedged edged tool. Further, the work time from the rough grinding to the finish grinding may be shortened as compared to that of the grinding work carried out while switching at least three types of conventional grinding stones of the rough grinding stone, semi-finishing grinding stone and finishing grinding stone.

While a preferred embodiment has been described, variations thereto will occur to those skilled in the art within the scope of the concepts of the present device which are delineated by the following claims.

Claims

1. An edged tool grinding stone in which fine powder of an abrasive material is provided on a grinding surface of a natural grinding stone or of an artificial grinding stone such as a ceramic grinding stone, vitrified grinding stone, silicate grinding stone, rubber grinding stone, resinoid grinding stone, shellac grinding stone and metal bond grinding stone to be able to grind an edged tool by said grinding stone via water and said abrasive fine powder.

2. The edged tool grinding stone according to Claim 1, wherein said abrasive fine powder provided on said grinding surface of said artificial grinding stone is emery which is fine powder of garnet or emery which is powder of a blend of corundum, magnetite and quartz.

3. The edged tool grinding stone according to Claim 1, wherein said abrasive fine powder provided on said grinding surface of said artificial grinding stone is powder of ceramics.