Polishing body

Abstract

To provide a polishing body that can remove smudges in various portions of an object to be polished, without contaminating the object to be polished.SOLUTION: A polishing body 1 is formed of calcined clay including kaolinite, has Mohs hardness of 4-5, and is formed in nearly square pillar-shape as a whole, in which both end faces in a longitudinal direction thereof have shapes oblique with respect to the longitudinal direction, one end face of both end faces in the longitudinal direction has a shape swellingly curving to outside and the other end face has a flat shape.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to abrasive bodies.

Background Art

[0002] For example, cement is used for the adhesion of stone materials such as granite used for gravestones and the construction of joints. Such cement joints often turn black and become dirty over time. This blackening and soiling cannot be sufficiently cleaned even with various detergents or a high-pressure washer. Further, over time, blackening, water stains, and other dirt penetrate into the entire flat surface of the stone material and the recessed portions such as engraved characters and patterns.

[0003] Stains can be scraped off with a tool using a blade of a cutter knife made of iron such as a cutter scraper. However, the iron content contained in the cutter knife adheres to the stone material, and rust forms on the adhered iron content, impairing the design of the stone material. Also, although it is possible to remove stains with a scraper using fiber-reinforced plastic, it requires force and time to completely remove the stains, and it is difficult to efficiently remove the stains.

[0004] Further, in order to remove stains, it is conceivable to use the joint removal tool disclosed in Patent Document 1. However, this tool is suitable for scraping off joint agents in thin, flat, and linear portions, but it is difficult to remove stains from a stone material having a wide flat surface and curved recessed portions such as engraved characters and patterns. Also, since this tool is equipped with a hard tip, there is a risk of damaging the object to be polished.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide an abrasive body capable of removing dirt from various parts of an object to be polished without damaging the object to be polished.

Means for Solving the Problems

[0007] The abrasive body according to the present invention is formed from fired clay containing kaolinite and has a Mohs hardness of 4 to 5. Further, it is preferably in a substantially quadrangular prism shape as a whole, and both end faces in the longitudinal direction are inclined with respect to the longitudinal direction. Furthermore, it is desirable that one of the end faces in the longitudinal direction has a curved shape that bulges outward, and the other end face has a flat shape.

Effects of the Invention

[0008] The abrasive body according to the present invention is formed from fired clay containing kaolinite and has a Mohs hardness of about 4 to 5. Therefore, it is possible to remove dirt from various parts of the object to be polished without damaging the object to be polished.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0010] Hereinafter, the polishing body according to the embodiment of the present invention will be described in detail.

[0011] As illustrated in FIGS. 1, 2, 3, and 4, the polishing body 1 is generally in the shape of a substantially rectangular prism and includes a front surface 11, a back surface 12, a right side surface 13, a left side surface 14, a bottom surface 15, and a top surface 16. The right side surface 13 and the left side surface 14, and the bottom surface 15 and the top surface 16 are in a substantially parallel relationship. The right side surface 13 and the left side surface 14 are in a substantially congruent relationship with each other. The length in the longitudinal direction of the polishing body 1, that is, the depth D, is longer than the length in the short direction, that is, the width W and the height H. An XYZ orthogonal coordinate system is set with the depth direction of the polishing body 1 as the X-axis direction, the width direction as the Y-axis direction, and the height direction as the Z-axis direction.

[0012] The front surface 11 and the back surface 12, which are both end faces in the longitudinal direction of the polishing body 1, are inclined with respect to the longitudinal direction X and are in contact with the bottom surface 15 and the top surface 16 obliquely, respectively. The angle α1 formed by the front surface 11 and the bottom surface 15 and the angle α2 formed by the back surface 12 and the top surface 16 are acute angles, and the angle β1 formed by the front surface 11 and the top surface 16 and the angle β2 formed by the back surface 12 and the bottom surface 15 are obtuse angles. The angle α1 and the angle α2 are each preferably 25° to 55°, for example, about 40°. By setting such angles, the tip portion A formed by the front surface 11 and the bottom surface 15, the corner portion B formed by the back surface 12, the right side surface 13, and the top surface 16, and the corner portion C formed by the back surface 12, the left side surface 14, and the top surface 16 become protruding portions. As a result, it becomes easy to insert into the recess in the object to be polished and polish the inner portion thereof. Hereinafter, the tip portion A, the corner portion B, and the corner portion C are referred to as protruding portions.

[0013] The front surface 11 is curved so as to bulge outward. Specifically, the sides where the front surface 11 contacts the bottom surface 15 and the sides where the front surface 11 contacts the upper surface 16 are arc-shaped or parabolic and protrude outward, and the two sides are parallel.

[0014] The back surface 12 is formed flat.

[0015] Considering ease of handling and workability, etc., the overall size of the abrasive body 1 is desirably a size that is easy for an operator to hold and work with, for example, a width W = 1 cm to 5 cm, a depth D = 5 cm to 10 cm, and a height H = 1 cm to 5 cm. For example, it is desirable that the width W = 3 cm, the depth D = 8 cm, and the height H = 2 cm.

[0016] The abrasive body 1 is integrally formed from clay containing kaolinite (Al 4 Si 4 O 10 (OH) 8 ). The molecular structure of kaolinite is layered. Since the Mohs hardness of granite such as Onyx used for tombstones is 6 to 7, the Mohs hardness of the abrasive body 1 is 4 to 5 so as not to damage the object to be polished.

[0017] The manufacturing method of the abrasive body 1 is as follows: First, fired clay containing kaolinite fired to have a Mohs hardness of 4 to 5 is processed into a quadrangular prism shape. Next, both ends in the longitudinal direction of the clay formed into a quadrangular prism are formed so as to have an inclination with respect to the longitudinal direction X. At this time, one end face is processed into a curved surface that bulges outward, and the other end face is processed flat. In this way, the abrasive body 1 is manufactured.

[0018] The method of using the abrasive body 1 is to wipe the dirt off by rubbing it back and forth or left and right in a state where the abrasive body 1 is in contact with the dirt on the object to be polished. When the dirt is widely present on the surface of the object to be polished, for example, as shown in Fig. 5(A), by pressing any one of the relatively wide planes of the abrasive body 1, that is, the right side surface 13, the left side surface 14, the bottom surface 15 or the upper surface 16 against the object to be polished and rubbing it, it is possible to efficiently remove the dirt. Also, for example, when it is desired to remove the dirt from a portion having a complex shape such as a depression like characters, patterns, etc. engraved on the object to be polished, as illustrated in Figs. 5(B) and (C), by inserting the protrusions A, B or C into the depression and rubbing it, it is possible to efficiently remove the dirt. In particular, since the protrusion A is curved, by polishing while slightly rotating the entire abrasive body 1 while bringing the protrusion A into contact with the dirt, it is possible to efficiently remove the dirt.

[0019] Since the abrasive body 1 is made of fired clay, it is consumed by use like an eraser and the overall volume becomes smaller. When the protrusions become rounded due to wear, it becomes difficult to bring the abrasive body 1 into contact with the inside of a portion having a complex shape such as a thin groove or a recessed portion in the object to be polished. In this case, it is possible to revive the protrusions by shaving or grinding the rounded portion of the abrasive body 1 with a knife, file, etc. having a Mohs hardness of 6 or more so that it becomes angular. Also, in order to adapt the size to the portion in the object to be polished where the dirt is to be removed, it is possible to adjust the abrasive body 1 to an optimum size and shape by intentionally shaving or grinding the abrasive body 1 with a knife, file, etc. having a Mohs hardness of 6 or more.

[0020] Since the abrasive body 1 has a plurality of surfaces with relatively large areas and protrusions, it is possible to efficiently remove dirt by selectively using the parts according to the shape of the part of the object to be polished where the dirt is to be removed and polishing.

[0021] In addition, a set of abrasive bodies in various shapes and sizes may be prepared and used appropriately according to the site to be cleaned. For example, abrasive body 1, a flat plate-shaped abrasive body with a relatively large contact surface, a sheet-shaped abrasive body, a pencil-shaped abrasive body with a rod shape and a tapered tip, a spherical or hemispherical abrasive body, etc. may be prepared as a set and used appropriately according to the size, shape, and site of the part to be polished.

[0022] If the abrasive body is a rectangular parallelepiped, even if trying to polish the dirt adhering to the depth of the groove part or the like of the object to be polished, the corner part of the abrasive body and the object to be polished may interfere, the abrasive body may not contact the dirt, and polishing may become difficult. However, by forming a protruding part on abrasive body 1, it becomes possible to scrape off the dirt adhering to the depth of the groove part of the object to be polished.

[0023] Abrasive body 1 is suitable for polishing tombstones or their joints after years, but if the Mohs hardness of the object to be polished is 6 or more, not only granite used for tombstones, but also tile materials or their joints can be the objects to be polished.

[0024] In addition, since abrasive body 1 is made of fired clay containing kaolinite, even if it wears during use, it is possible to easily restore the corners, and it is also possible to adjust to the optimal size and shape, and there is no inconvenience that rust occurs on the object to be polished due to the adhesion of iron content to the object to be polished.

[0025] Therefore, abrasive body 1 can efficiently and easily remove dirt such as blackening and bleeding stains adhering to a portion with a complex shape in the object to be polished without damaging the object to be polished.

[0026] Next, a modified example of abrasive body 1 will be described. In the above-described embodiment, the front surface 11 and the back surface 12 are substantially parallel, but as illustrated in FIGS. 6(A) and (B), the inclination direction of the back surface 12 is arbitrary.

[0027] Also, the size and shape of the protruding portion are not limited to those exemplified in the embodiments. For example, as shown in the right side view of FIG. 7(A), the protruding portion on the front surface 11 may be arranged at an intermediate position between the bottom surface 15 and the upper surface 18. Additionally, the shape of the curved surface is arbitrary. Also, as shown in FIG. 7(A), instead of the flat back surface 12, a protruding portion 12A with an arbitrary shape may be formed.

[0028] Also, it is not necessary to make the front surface 11 a curved surface. As exemplified in FIG. 7(B), the front surface 11 may be a flat surface 11A similar to the back surface 12. Also, the shape of the back surface 12 can be appropriately changed, such as the back surfaces 12A and 12B shown in FIGS. 6(A) to 7(B).

[0029] In the above embodiment, the abrasive body 1 was manufactured by forming fired clay containing kaolinite into a square column shape and then forming both end faces, but it is not limited to this method. For example, the abrasive body 1 may be manufactured by forming clay containing kaolinite into a square column shape, then forming both end faces, and then firing. Also, a mold imitating the shape of the completed abrasive body 1 may be prepared, filled with clay containing kaolinite, formed, and then fired to manufacture the abrasive body 1.

[0030] The present invention is not limited to the above embodiments and examples, and can be appropriately changed within the scope of the gist of the invention.

Example

[0031] A polishing body made of kaolinite with a width W = 2 cm, a depth D = 6 cm, a height H = 1.5 cm, α1 = α2 = 45°, and a Mohs hardness of 4 was manufactured. Using this polishing body, the black stains on the surface of the granite and the grooves of the character "Yo" engraved on the granite were polished. The surface of the granite was polished using the flat and large-surface-area part of the polishing body, and the grooves of the character "Yo" were polished using the protruding part of the polishing body. A photograph of the granite before polishing is shown in Fig. 8(A), and a photograph after polishing is shown in Fig. 8(B). In Fig. 8(A), black stains adhere to the surface of the granite and the grooves of the character "Yo" engraved on the granite, but after polishing, the stains are removed and, visually, it has reached a level where it appears almost white. It can also be seen that the surrounding granite has not been damaged. Furthermore, by properly using parts such as the flat surface, curved surface, and protruding part of the polishing body, the work could be carried out efficiently.

Explanation of Signs

[0032] 1 Polishing body 11 Front surface 12 Back surface 13 Right side surface 14 Left side surface 15 Bottom surface 16 Flat surface 17 Object to be polished

Claims

1. An abrasive body formed from fired clay containing kaolinite and having a Mohs hardness of 4 to 5.

2. The abrasive body according to claim 1, which is generally in the shape of a quadrangular prism and has both end faces in the longitudinal direction inclined with respect to the longitudinal direction.

3. The abrasive body according to claim 2, wherein one of the end faces in the longitudinal direction has a shape curved so as to bulge outward, and the other end face has a flat shape.

Images