JPH11138451A - Water proof sand paper grindstone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with replacement of a base following abrasion of a grindstone surface and improve practicability by forming the hard grindstone surface on an upper surface of a grindstone base, brought into close contact and fixing a rear surface of a sand paper to the grindstone surface, correspondingly thereto in size, and using a polishing surface with abrasive grains as the grinding surface of the stone. SOLUTION: A water proof sand paper 2 is mounted on a surface 3 of a grindstone base 1, with its rear surface 5 being in contact therewith. A wing nut 18 of one pressing plate 7 is loosened, and one end of the sand paper 2 penetrates through a water proof sand paper through-hole 16. The pressing plate 7 is retreated to the position a bolt 17 reaches on an uppermost position of an oblong hole 14, and then fixed thereto by means of the wing nut 18. Namely, one end of the sand paper is fixed while being sandwiched between a pressing rubber 15 and an inclined portion 6. Similar operation is executed in respect to the other end of the sand paper 2. The rear surface 5 of the sand paper is thus brought into close contact with the grindstone surface 3. Polishing is performed by the use of a polishing surface 4 of the fixed sand paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In the present invention, the conventional grindstone always restores the sharpened surface due to wear caused by use (hereinafter referred to as "rehabilitation").
Had to do. The present invention relates to a grindstone which is made unnecessary by using the grindstone stand of the present invention and water-resistant sandpaper firmly in combination to use this inconvenient rework.

[0002]

2. Description of the Related Art A grindstone is originally obtained by cutting a natural stone suitable for use for sharpening a cutting tool and processing it into an appropriate size. However, there are synthetic whetstones that can be used instead of high quality stones, which are expensive.

FIG. 21 shows an example of a conventional general grinding stone.
The grinding surface 3X of the grinding wheel 2X is a flat surface. This whetstone 2X
Is fixed to the grindstone base 1X. This whetstone 2X, which has a general flat hard sharpening surface, is used for sharpening most kinds of knives such as knives and knives.

In addition, a grindstone 2Y having an upwardly convex sharpened surface 3Y used for sharpening a Japanese sword or the like shown in FIG.
Or, conversely, as shown in FIG.
There is also a whetstone 2Z having. These grindstones often use a part of the necessary curved sharpening surfaces 3Y and 3Z, and thus often partially reduce the sharpening.

Regarding the conventional grinding stones 2X, 2Y and 2Z, any grinding stone having any sharpening surface is worn away due to use, and the shape of the sharpening surface is destroyed.

[0006]

Conventional grindstones are heavy because they are made of stone. In addition, there are many types such as coarse, medium and finish grindstones. Also, it is necessary to provide appropriate moisture so as not to crack when storing the more expensive whetstone. Moreover, in addition to the sharpening operation, it is necessary to rehabilitate, and the rehabilitation requires a large labor burden, which makes the handling of the grindstone inconvenient. In addition, expensive whetstones are wasted and scrapped for rebuilding.

[0007]

According to the present invention, a hard grinding wheel surface 3 is provided on an upper surface of a grinding wheel base 1 in FIGS.
The back surface 5 of the waterproof sandpaper having a size corresponding to the grinding wheel surface 3 is fixed to the grinding wheel surface 3 so as to be in close contact therewith, and the polishing surface 4 coated with sharpening powder is used as the grinding surface of the conventional grinding wheel. .

[0008] With any conventional grinding stone having a sharpening surface, if a grinding surface similar to the grinding stone is formed and the back surface of a thin and durable water-resistant sandpaper is fixed closely to the grinding surface, the grinding surface on the surface becomes the sharpening surface of the conventional grinding stone ( Hereafter referred to as the sharpening surface). As a result, the cutting edge does not sink, and the polished surface of the water-resistant sandpaper is firmly in contact with the cutting edge being sharpened, and has the effect of sharpening a sharp edge with no roundness.

According to the first aspect of the present invention, if a water-resistant sandpaper having a grain size corresponding to the grain size of a conventional grindstone is used, the grindstone has the same sharpening surface as the conventional grindstone.

If a water-resistant sandpaper 2 having a grain size equivalent to that of a conventional grindstone is used, a single grindstone table 1 can be used as a grindstone for rough, medium and finish grinding.

Since the water-resistant sandpaper 2 is an industrial product and has a stable quality, it does not come and go like a conventional grindstone, and is cheaper and lighter than a conventional grindstone. Since it is used, if it becomes old or the polished surface is reduced, it can be easily replaced and restored to a new sharpened surface with low maintenance cost, and there is also the effect that waste and labor of reworking are unnecessary. .

The inventor has solved several problems in the process of completing the present invention and has enhanced the perfection of the present invention. That is, as shown in FIG. 1 to FIG.
When the sharpening blade is inclined with respect to the grindstone surface 3, the water-resistant sandpaper 2 is cut off or cut into the corner of the grindstone surface 3 in the width direction, and the cutting edge is chipped. In many cases, the blade main body polished at the end of the sandpaper 2 is polished and scratched.

According to the present invention, the corners R at both ends in the width direction of the upper surface of the grindstone surface 3 are rounded in FIGS. Covered.

According to the second aspect of the present invention, the corners in the width direction of the grindstone surface 3 are rounded and covered with the waterproof sandpaper 2P. No cutting. Also, it is possible to prevent the sharpening knife from being damaged.

The inventor has encountered the following problem. That is,
When the waterproof sandpaper is fixed to the grindstone surfaces 3, 3 </ b> H, and 3 </ b> B with the holding plate 7, if the waterproof sandpaper is not parallel to the grindstone, it is likely to be wrinkled when it is attached, and a part of the back surface of the waterproof sandpaper is the grindstone surface 3. , It is difficult to bring the entire back surface of the water-resistant sandpaper into close contact with the surface.

The present invention corresponds to claim 3 and FIGS.
In grindstone stand 1, holding plate 7, water resistant sandpaper 2
Mark marks 20, 21, 2 at predetermined positions in the width direction of
I put 2,23.

According to the third aspect of the present invention, when the waterproof sandpaper 2 is attached to the grindstone table 1, the mark (20 or 21) of the grindstone table 1 or the pressing plate 7 is marked with the waterproof sandpaper mark (22 or 23). If they are combined, they can be easily brought into close contact and fixed without wrinkling.

The inventor has also encountered the following problem. That is, since the conventional sandpaper is entirely coated with the abrasive, when it is partially used as a grindstone, the usable portion to which the abrasive is applied is often discarded without being used.

The present invention corresponds to claim 4 and FIGS.
Water-resistant sandpaper 2 attached to grinding wheel head 1 in 3
V is a blank portion 24 as a region where no abrasive is applied to both ends in the longitudinal direction, and a water-resistant sandpaper 2W is a blank portion 25 as a region where the abrasive is not applied to portions off the whetstone surfaces 3, 3H and 3B on both sides in the width direction. Was provided.

According to the means corresponding to the fourth aspect, the use of the blank portion 24 of the water-resistant sandpaper as the mounting area of the holding plate 7 can eliminate the abrasive, thereby eliminating waste.

Regarding the blank areas 25 on both sides in the width direction, the blades are various and diverse, so that the shape of the grindstone surface is complicated, and the water-resistant sandpaper cannot be brought into close contact with the grindstone surface only by the holding plates at both ends in the longitudinal direction. In this case, the blank portions 25 on both sides in the width direction are used to be sandwiched between the grindstone side plates 10 by using a sandwiching device, or to be adhered to the side plates 10 by applying an adhesive material and used for close contact.

The inventor has also encountered the following problem. In other words, if the blank areas 24 at both ends in the longitudinal direction are made free, they are spoiled and hinder the sharpening operation, and the blank areas 24 are twisted and difficult to set on the grindstone base 1B. In addition, the surface of the water-resistant sandpaper grindstone of the present invention is various in accordance with the type of the blade, and there is a limit in making the back surface of the water-resistant sandpaper 2F close to the grindstone surface only by the holding plate 7.

According to the fifth aspect of the present invention, there is provided a fixed area of a blank 25 where no abrasive is applied on both ends 24 in the longitudinal direction and both sides in the width direction, and the abrasive is applied on the back surface from each end. The pressure-sensitive adhesive was applied to a predetermined width that did not reach the set area.

According to the means corresponding to claim 5, FIG.
After attaching the water-resistant sandpaper 2E to the grindstone base 1H having the grindstone surface 3H having a convex curved surface on the upper side according to the procedure described with reference to FIGS. 1 to 4, both ends thereof are connected to the connecting portion 29 below the grindstone base 1H.
Connected.

Also, in the case of a downwardly concave surface shown in FIG.
The back surface of the portion coated with the abrasive on the upper surface of the water-resistant sandpaper 2F is placed on the whetstone surface 3B, and the portion coated with the adhesive 27 on the back surface of the blank area on both sides in the width direction is adjusted to the curved surface of the sharpening surface. Open the cuts in the required places, and apply the fixed pieces 28 formed by opening to the grindstone side plates 10 on both sides of the grindstone base 1B by applying tension to the waterproof sandpaper 2.
The back surface of F is brought into close contact with the sharpening surface 3B, the polished surface is fixed, and the blade is sharpened.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 20 show an embodiment of the sandpaper grindstone of the present invention. In the drawings, the same components as those described above are denoted by the same reference numerals, and description thereof is omitted.

FIGS. 1 to 4 show a first embodiment corresponding to claim 1 of the present invention. In this embodiment, 1 is a grindstone stand. The grinding wheel base 1 is formed into a trapezoidal shape from a steel plate, and a hard grinding wheel surface 3 is provided on an upper surface thereof. Bolt holes 9 for fixing the holding plate 7 are formed in the inclined portions 6 on both sides in the longitudinal direction of the grinding wheel surface 3. The grindstone side plate 10 is a strength member that integrally joins the grindstone surface 3 and the inclined portion 6 at both ends in the width direction of the grindstone base 1, and further extends below the lower end of the inclined portion 6 to form a grindstone foot 11. I have. Also, as shown in FIG. 3, the wheel head side plates 10 are parallel to each other.

Reference numeral 2 denotes a waterproof sandpaper. The water-resistant sandpaper 2 forms a polished surface by uniformly applying and fixing a sharpening powder of a predetermined particle size to the entire surface of one surface of the tough water-resistant paper or cloth. It consists of a polished surface 4 of a waterproof sandpaper and a back surface 5 of a waterproof sandpaper to which nothing is applied. Water resistant sandpaper is an industrial product.

The grindstone surface 3 is formed on the back surface 5 of the waterproof sandpaper.
When the paper is fixed closely, the surface 4 of the waterproof sandpaper
The polished surface was processed in consideration of the surface, rigidity, and the like so that the polished surface was similar to the sharpened surface of a conventional grindstone. Also, it has a sufficiently high hardness and rigidity with respect to any of vertical, longitudinal and lateral forces applied when the blade is sharpened on the grindstone surface 3.

Reference numeral 7 denotes a holding plate. The holding plate 7 is made of a steel plate and includes a holding plate side plate 12 at both ends in the width direction of the holding plate swash plate 8 and a holding rubber support plate 13 above. An elongated hole 14 for a retaining plate bolt is provided at the center of the inclined portion 8 of the retaining plate, and a water-resistant sandpaper passage hole 16 is provided at an upper end thereof. The spacing between the pressing plate side plates 12 is finished so that the pressing plate side plates 12 can be incorporated into the grindstone side plate 10 without play in the width direction. A pressing rubber 15 is fixed to the pressing rubber support plate 13.

The holding plate 7 is provided on each of the inclined portions 6 on both sides in the longitudinal direction of the whetstone base 1 with bolts which penetrate through the whetstone head bolt holes 9 and the elongated holes 14 for the holding plate bolts from inside the whetstone base 1 through washers. 17 and a wing nut 18. The pressing plate 7 of FIG. 4 transmits the tightening force of the wing nut to the grinding wheel head inclined portion at the lower end of the pressing rubber 15 and the pressing plate swash plate 8. The angle of the pressing rubber support plate 13 is adjusted so that the pressing rubber 15 uniformly hits the grindstone base inclined portion 6.

The grindstone table 1H shown in FIG. 18 is the same as the grindstone table 1 except that the grindstone table 3H has an upwardly convex curved surface 3H.

The grindstone table 1B shown in FIG. 19 is substantially the same as the grindstone table 1 except that the upper surface of the grindstone table 1B has a concavely curved surface.

Next, the operation of the first embodiment of the present invention will be described. In FIG. 1 to FIG. 4, the back surface 5 of the waterproof sandpaper is brought into contact with the grindstone surface 3 of the grindstone table 1, and the longitudinal direction of the waterproof sandpaper 2 is aligned with the longitudinal direction of the grindstone surface 3.
The wing nut 18 of one holding plate 7 is loosened, and one end of the waterproof sandpaper 2 is passed from the inclined portion 6 side through the waterproof sandpaper passage hole 16 above the inclined portion 6. Next, the holding plate 7 is lowered to a position where the bolt 17 comes to the uppermost part of the holding plate bolt elongated hole 14 and fixed to the inclined portion 6 with the wing nut 18 so as not to interfere with the sharpening work. In this manner, one end of the waterproof sandpaper 2 is sandwiched between the pressing rubber 15 and the inclined portion 6 and is fixed with a uniform load over the entire width.

Next, the opposite end of the waterproof sandpaper 2 is fixed in the same manner as described above. At this time, the end passing through the water-resistant sandpaper through hole 16 is strongly pulled, and the back surface 5 of the water-resistant sandpaper is brought into close contact with the grindstone surface 3, and then the wing nut 18 is tightened and fixed. Thus, the polished surface 4 of the water-resistant sandpaper whose back surface is in close contact with the hard grindstone surface 3 forms a hard polished surface similar to the sharpened surface 3X of the conventional grindstone.

In many cases where the grinding wheel surface 1H shown in FIG. 18 has a convex grinding wheel surface 3H above, the back surface 5 of the water-resistant sandpaper is brought into close contact with the grinding wheel surface 3H by the procedure described with reference to FIGS. If fixed, the polished surface of the water-resistant sandpaper constitutes the same polished surface as the polished surface 3Y of the conventional grindstone.

In the case where the concave grinding wheel surface 3B is provided below the grinding wheel base 1B shown in FIG. 19, before the procedure described with reference to FIGS. Is fixed by applying tension to the grindstone side plate 10. Subsequently, when the back surface of the water-resistant sandpaper 2F is fixed in close contact with the grindstone surface 3B by the procedure described with reference to FIGS. 1 to 4, the polished surface of the water-resistant sandpaper 2F has a concave curved sharpening surface below the conventional grinding stone 2Z. A sharpening surface similar to 3Z is constructed.

According to the embodiment of the present invention, when the honed surface 3 is formed in the same manner as the honed surface of the conventional whetstone and the back surface 5 of the water-resistant sandpaper is fixed closely, the polished surface of the thin and soft surface becomes The sharpening surface is the same as the sharpening surface of a conventional whetstone. It should be noted that in the first aspect, the hard sharpening surface is synonymous with being formed so as to have rigidity. Due to the rigidity, the water-resistant sandpaper does not locally deform on the grindstone surface, and the water-resistant sandpaper 2 can be brought into close contact with the sandpaper 2 by applying a tension. It is in a state where it sharply contacts the sharpened edge without sinking and sharpens to a sharp edge without roundness. The reason why the pressing plate 7 is used is that if the back surface of the polished surface is coated with an adhesive and brought into close contact, the sharpened surface becomes soft. This is to prevent this. Also, this is to enable the polishing surface to be easily moved back and forth by peeling off from the grinding wheel surface 3 many times.

By replacing the water-resistant sandpaper 2 which is an industrial product, a constant sharpened surface can be maintained at a low cost. Further, there is no need for rework. It has many effects.

FIGS. 5 to 7 show a second embodiment corresponding to claim 2 of the present invention. In the present embodiment, (a) the corners at both corners in the width direction of the grinding wheel surface 3 are rounded with R. (B) The width of the waterproof sandpaper 2P is wider than the width of the grindstone surface 3. (C) The pressing rubber support plate 13 and the pressing rubber 15 of the pressing plate 7 are stretched in the width direction to align with the width of the waterproof sandpaper 2P, and are bent so as to face the grindstone side plate 10, and the waterproof sandpaper 2P is thus ground. The side plate 10 was also pressed. (D) The pressing rubber 15 of the pressing plate 7 is sandpaper 2
P is fixed so as to wrap the grindstone head 1 at three places, ie, the inclined part 6 of the grindstone head 1 and the wheel head side plate 10.

Since the present invention is constructed as described above, the pressing rubber 15 of the pressing plate 7 is provided by the water-resistant sandpaper 2P by the inclined portion 6 of the grinding wheel base 1 and the grinding wheel base side plates 10 on both sides in the width direction of the grinding wheel surface 3. It is fixed so as to cover the grindstone surface 3 at the location. Therefore, the waterproof sandpaper 2P covers and protects the corner R in the width direction of the grindstone surface 2.

FIGS. 8 to 10 show a third embodiment according to the third aspect. In the present embodiment. (B) Grinding wheel mark 1 at the central position in the width direction of each of grinding wheel head 1, 1H, 1B holding plate 7 and water-resistant sandpaper 2
0, mark 21 on the holding plate, mark 22 on the surface of the waterproof sandpaper, mark 23 on the back of the waterproof sandpaper
Was marked. (B) When the presser plate 7 is fixed to the grindstone table 1, the mark 20 of the grindstone table 1 and the mark 21 of the presser plate coincide. (C) Therefore, when the waterproof sandpaper 2 is fixed to the grindstone base 1 in the procedure shown in FIGS. 1 to 5, the mark 22 on the front surface or the mark 23 on the back surface of the waterproof sandpaper 2 is replaced with the mark 20 or the pressing plate of the grindstone 1. 7, the water-resistant sandpaper 2 can be easily attached to the grindstone surface 3 with the back surface 5 closely contacted without wrinkling.

FIGS. 11 to 13 show a first example of the fourth embodiment according to the fourth aspect of the present invention. In this embodiment, (a) In FIGS. 11 and 12, the water-resistant sandpaper 2V has blank portions 24 to which no abrasive is applied at both ends in the longitudinal direction as fixed regions. (B) In FIGS. 11 and 13, the water-resistant sandpaper 2 </ b> W has the grindstone surfaces 3, 3,
A blank portion 25 where no abrasive was applied was provided in a portion protruding from H and 3B. According to the present embodiment, the waterproof sandpaper 2V, 2
W is the abrasive applied to only the portions on the grindstone surfaces 3, 3H and 3B where the abrasive is required in FIGS. 1, 18 and 19, and the blanks 24 and 25 where the abrasive is not required are the abrasives. It is economical because the application of is omitted.

In the second example of the fourth embodiment, the blank fixing region 24 of the water-resistant sandpaper 2V having blank portions at both ends can be extended independently of the abrasive applied portion.
In the case where only a part of the polished surface is used like the use range L without using the entire sharpening surface as illustrated in FIG. 18, the worn polished surface is shifted and a new polished surface is used. The polishing surface can be used without waste because it can be transferred to the inside.

In the third example of the fourth embodiment, the blank water-resistant sandpaper 2W at both ends has a blank 25 in the width direction in addition to the blank 24 in the fixed area. Since there are various types of blades, the shape of the grindstone surface is complicated, and the water-resistant sandpaper can be applied to the grindstone surface 3H, 3 with only the holding plates 7 at both ends in the longitudinal direction.
B. In such a case, the blank 25 in the width direction is sandwiched between the grindstone side plates 10 by using a pulling and pinching device, or the back surface of the blank 25 in the width direction is coated with an adhesive material and fixed to the grindstone side plate 10 to prevent water resistance. Grinding stone surface 3 on the back of sandpaper
H and 3B are used to fix the polishing surface 4 closely.

In the fourth embodiment, an abrasive is conventionally applied to the entire surface of the waterproof sandpaper. When doing fine work, it is often done with bare hands, but there is no blank space to grab the paper, so if you use it for a long time, your hands will rub and it will hurt. Since the water-resistant sandpaper 2W of the present invention has a blank portion on the polished surface, it is easy to work and often does not hurt even when grasping.

FIG. 18 shows a first example of the fifth embodiment according to claim 5 of the present invention. In this embodiment, (a) the water-resistant santopaper 2E is free to have a polished surface longer than a sharpened surface in the longitudinal direction. When the polished surface is more than twice as long as the polished surface, the blank portions 24 at both ends are appropriately about 4 cm each. However, when the polished surface is the same length as the polished surface, the blank portion is at least 以上 of the polished surface. The length is better. (B) The connecting portions 29 at both ends of the water-resistant sandpaper 2E are left blank without applying an abrasive. (C) The water-resistant sandpaper 2E is fixed to the grindstone surfaces 1, 3H of the grindstone surfaces 3, 3H with the back surfaces thereof closely adhered to each other in the same procedure as in FIGS. It is turned to the lower side of the tables 1 and 1H to be connected by the connecting portion 29.

With this configuration, when the polished surface in the working range L on the grindstone surfaces 3 and 3H deteriorates, a new portion of the polished surface is moved to the range of L on the grindstone surfaces 3 and 3H and fixed. cure.

As described above, the annular waterproof sandpaper 2E
The setting is easy until the polished surface is deteriorated over the entire circumference of the polished surface. The long sandpaper is stored in the lower part of the grindstone compactly without getting in the way.

FIGS. 19 and 20 show a second example of the fifth embodiment according to the fifth aspect. In this embodiment, (a) The water-resistant sandpaper 2F is folded on the other fixed pieces 28 except for the fixed pieces 28 on both sides of the portion corresponding to the grindstone surface 3B as shown in FIG. (B) The back surface of the polished surface of the water-resistant sandpaper 2F is placed on the grindstone surface 3B of the grindstone table 1B, and tension is applied so that the fixed pieces 28, which are a pair at both ends in the width direction, are simultaneously drawn downward, and the grindstones on both sides are provided. It is stuck on the base plate 10 or wound around the back of the grindstone base plate 10 and bonded. (C) The waterproof sandpaper 2F is fixed to the grindstone base 1B by the pressing plate 7 in the procedure described with reference to FIGS. In this way, even in the case of a concave curved surface downward, the back surface of the water-resistant sandpaper can be fixed in close contact with the grindstone surface.

In the embodiment of the present invention, (a) the grinding wheel head 1 and the holding plate 7 are described as being formed from a steel plate, but the material is not limited to the steel plate. (B) The shape of the grindstone surfaces 3, 3H, 3B is not limited to a flat surface, an upwardly convex curved surface, or a downwardly concave curved surface, and a combination of these is also possible. (C) The fixing method for fixing the back surface of the water-resistant sandpaper closely to the grindstone surface of the grindstone head is not limited to the wing nut method. The method of claim 5 also includes the method of using an adhesive. (D) Wheel head, holding plate, water-resistant sandpaper 2, 2
The positions of the marks 20, 21, 22, and 23 of the front and back surfaces of P, 2V, 2W, 2E, and 2F have been described as being in the center in the width direction, but it is sufficient that each of them is marked at one fixed position. (E) In the embodiment of the present invention, the combination of the grinding wheel head 1H and the waterproof sandpaper 2E and the combination of the grinding wheel head 1B and the waterproof sandpaper 2F have been described. 2P, 2V,
The combination of 2W, 2E, and 2F is free. Also,
The water-resistant sandpaper 2F is fixed to the concave surface of the grindstone surface 1B. By using the fixed pieces on both sides in the width direction of the water-resistant sandpaper 2F in the example of fixing the water-resistant sandpaper to the grindstone surface in various combinations. The back side of the paper can be closely contacted and fixed, and the polished surface can be the same as the polished surface of a conventional grindstone. It goes without saying that various changes can be made without departing from the spirit of the present invention.

1

According to the water-resistant sandpaper grindstone of the present invention, according to the first aspect, it is possible to relieve the whetstone surface from being rehabilitated due to wear. 2. The waste of scraping expensive whetstones of natural stones due to rectification is eliminated. 3. There are many types of coarse, medium, and finished abrasives, and the problem of bulkiness in carrying and humidity control is eliminated. 4. Since the water-resistant sandpaper 2 is an industrial product, it can be purchased at low cost anywhere and is always a water-resistant sandpaper whetstone with stable quality. 5. By changing the roughness of the water-resistant sandpaper 2, it can be used as a rough grinding, a medium grinding, and a finishing grinding with one grindstone table, and is light and bulky to carry. According to claim 2 6. Since the water-resistant sandpaper 2P is not cut by the blade, the edge of the grindstone surface is not cut, and the blade is not damaged, the blade can be sharpened with ease. According to claim 3 7. When the water-resistant sandpaper 2 is attached to the grindstone table 1, the back surface can be easily brought into close contact with the grindstone surface without wrinkling, so that it can be easily fixed. 7. In accordance with claim 4, wherein the edge is rounded due to wrinkles, and the blade does not flow along the wrinkles, so that the sharpening can be performed with ease. The abrasive at the portion where the water-resistant sandpaper is attached can be omitted, and the work can be used easily without wasting the polished surface. It has an excellent effect. According to claim 5,9. The polished surface of the annular waterproof sandpaper can be used without waste over the entire range. In particular, there is no waste of the abrasive in the usage for sharpening a part of the sharpening surface. 10. The back surface of the water-resistant sandpaper can be fixed to the whetstone surface of any shape with the back surface in close contact. 11. In addition, the conventional whetstone is made of stone, so it is heavy, so the so-called sickle sharpening method of holding the whetstone with one hand and holding down the blade with one free hand could not be done by ordinary people, but the water-resistant sandpaper whetstone of the present invention Is made to match the shape of the blade, and since the grindstone is light, a dangerous blade can be fixed and the grindstone of the present invention can be sharpened lightly with one hand, so that the grinding work is less fatigued. It has many excellent effects.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a grinding wheel head according to the present invention.

FIG. 2 is a perspective view of FIG.

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a sectional view taken along line AA in FIG. 3;

FIG. 5 is a perspective view of a water-resistant sandpaper grindstone to which a water-resistant sandpaper wider than a sharpening surface according to claim 2 of the present invention is attached.

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a sectional view taken along line BB in FIG. 6;

FIG. 8 is a perspective view of a grindstone table provided with marks for setting a waterproof sandpaper.

9 is a top view of FIG. 8 and an installation example diagram in which sandpaper is attached by using a mark.

FIG. 10 is an exploded perspective view of FIG.

11 is a sectional view taken along line CC of FIG. 12 and a sectional view taken along line DD of FIG. 13;

FIG. 12 is an example diagram in which sharpening powder is not applied to both ends in the width and longitudinal directions.

FIG. 13 is an example diagram in which sharpening powder is not applied to both ends in the width and longitudinal directions and both sides in the width direction.

FIG. 14 is a sectional view taken along the line EE of FIG. 15;

FIG. This is an example in which an adhesive is applied to the back side of a blank portion where no sharpening powder is applied.

16 is a sectional view taken along line FF and GG of FIG. 17;

FIG. 17 is an example in which a cut is made on both sides where no sharpening powder is applied, and an adhesive is applied on the back side.

FIG. 18 is an example of use of FIGS. 14 and 15;

19 is an example of use of FIGS. 16 and 17. FIG.

20 is a development view of using the waterproof sandpaper of FIG. 19;

FIG. 21 is a conventional grindstone having a flat sharpening surface.

FIG. 22 is a conventional grindstone whose sharpening surface is upwardly curved.

FIG. 23 is a conventional grindstone having a sharply concave concave surface.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 wheel head 2 2P water-resistant sandpaper 3 whetstone surface 4 polished surface of water-resistant sandpaper (front surface) 5 back surface of water-resistant sandpaper R R at corners of corners in width direction of whetstone surface 7 holding plate 20 mark of whetstone base 21 mark of holding plate 22 Marks on the surface of the water-resistant sandpaper 23 Marks on the back of the water-resistant sandpaper 24 Blanks where no abrasive is applied to both ends in the longitudinal direction 25 Blanks where no abrasive is applied to both ends in the longitudinal direction and both sides in the width direction 26 24 On the back surface at both ends in the longitudinal direction Coated adhesive 27 25 Adhesive applied to the back on both sides in the width direction

Claims (5)

[Claims] 1. A hard grinding wheel surface (3) on an upper surface of a grinding wheel base (1).
The back surface (5) of the water-resistant sandpaper is closely fixed to the grindstone surface (3), and the polished surface (4) of the water-resistant sandpaper (2) on which the sharpening powder is applied is used as the sharpening surface. Water resistant sandpaper whetstone. 2. The width (R) of both corners in the width direction of the grinding wheel surface (3) of the grinding wheel head (1) is rounded, and the width of the waterproof sandpaper (2P) is made wider than the width of the grinding wheel surface (3). The water-resistant sandpaper grindstone according to claim 1. 3. A mark (20, 21, 22, 23) is provided at a predetermined position in the width direction of each of the grinding wheel base (1), the holding plate (7) and the waterproof sandpaper (2), and the mark (20) of the waterproof sandpaper is provided. The water-resistant sandpaper according to claim 1 or 2, wherein the water-resistant sandpaper (2) is closely fixed by aligning the marks (20, 21) with the marks (20, 21) of the whetstone stand (1) and the holding plate (7). Whetstone. 4. The water-resistant material according to claim 1, further comprising blank areas (24, 25) where no abrasive is applied at both ends in the longitudinal direction and both sides in the width direction, and having a polished surface therebetween. Water resistant sandpaper for sandpaper whetstones. 5. A fixed area of a blank (24, 25) where no abrasive is applied is provided at both ends in the longitudinal direction and both sides in the width direction,
5. The water-resistant sandpaper for a water-resistant sandpaper whetstone according to claim 4, wherein an adhesive (26, 27) is applied to a predetermined width of the back surface from each end so as not to reach a region where the abrasive is applied.