Detachable grinding disc for electric grinders

Abstract

To provide a grinding disk that is configured to be detachably attached to an electric grinder for a table, which is frequently used for various types of work such as woodworking, and is excellent in adhesion efficiency and use efficiency.SOLUTION: The grinding disk comprises: a plate part made of a circular metal plate; a sanding part on which a grinding member is formed such that a grinding surface is formed on one side of the plate part; and a fastening part provided in a form of a through hole at a central axis of the plate part to be easily fastened to the electric grinder. The plate part has a gradual curvature K such that a convex surface is formed on the sanding part side where the grinding surface is formed. The grinding disk elastically adheres to the electric grinder when fastened thereto.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an abrasive disc for attachment to an electric sander with high adhesion efficiency, and more particularly to an abrasive disc that is detachable from a table-type electric sander that is frequently used in woodworking and other work, and has excellent adhesion efficiency and usability. [Background technology]

[0002] Generally, as shown in FIG. 1(a), abrasive discs are attached to an electric grinder mounted on a table that is mainly used for woodworking and the like, and are used in a manner that rotates at high speed.

[0003] The abrasive disc of the present invention is different from a hand grinder used for double-sided use and cutting, and has a configuration in which one side is completely attached to the disc of an electric grinder via an adhesive.

[0004] Specifically, a disk is attached to an electric sander, and sandpaper is attached to the disk. When the abrasive surface of the sandpaper wears out, it is replaced as a disposable product.

[0005] The replacement method is as shown in Figure 1(b), in which the adhesive surface is forcibly removed, the disc surface where the residual adhesive remains is polished, and new polishing paper is attached by adhesive.

[0006] Therefore, the replacement process is complicated, and it is difficult to attach the abrasive paper neatly and in the correct position, causing difficulties for the user.

[0007] Furthermore, even if the sandpaper is finally attached, it is not attached exactly in the center, so when rotating at high speed, vibrations occur in the electric sander, which can cause malfunctions, and it has been reported that this often leads to safety accidents.

[0008] Therefore, a solution to this problem is needed, but up until now, the method of attaching abrasive paper to the existing disk has been used, as mentioned above.

[0009] Therefore, efforts are being made to manufacture abrasive discs, in which the disc and abrasive material are integrated, in a replaceable and reusable form.

[0010] However, when the abrasive disc is manufactured to have a simple flat surface, it is difficult to completely adhere to the existing disc surface of the electric grinder, and a solution to this problem is also required.

[0011] In this regard, in terms of prior art, an "abrasive disc and its manufacturing method" is disclosed in Korean Patent Publication No. 10-2006-0024016, but this uses a high-strength material that is highly resistant to heat and stress, and has the problem of low production efficiency making it difficult to apply to actual industries. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Korean Patent Publication No. 10-2006-0024016 Summary of the Invention [Problem to be solved by the invention]

[0013] SUMMARY OF THE INVENTION The present invention has been devised to solve the above-mentioned problems of the prior art, and has an object to provide an abrasive disc that can be easily attached to and detached from an electric sander.

[0014] Another object of the present invention is to provide a technique for preventing the abrasive disc from being turned upside down when fastened to an electric grinder.

[0015] Another object of the present invention is to provide a manufacturing technique for an abrasive disc that can be completely adhered to when fastened to an electric grinder.

[0016] The problems to be solved by the present invention are not limited to those mentioned above, and other problems to be solved by the present invention not mentioned here will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0017] The abrasive disc for attachment to an electric sander according to the present invention has a high adhesion efficiency and includes a plate portion formed from a circular metal plate, a sanding portion on one side of the plate portion on which an abrasive material is formed so as to form an abrasive surface, and a fastening portion formed in the form of a through-hole at the center axis of the plate portion and formed in a shape that allows easy attachment to the electric sander, and the plate portion has a gentle curvature K so that a convex surface is formed on the sanding portion side where the abrasive surface is formed, and when attached to the electric sander, it adheres elastically. [Effects of the Invention]

[0018] The abrasive disc for attachment to an electric sander according to the present invention, which has high adhesion efficiency, can be easily attached to and detached from an electric sander, which has the effect of making it convenient for reuse.

[0019] Furthermore, the present invention has the advantage that when the abrasive disc is fastened to the electric grinder, it can be tightly attached over the entire surface.

[0020] Furthermore, the present invention has the effect of preventing the abrasive disc from being turned over when the abrasive disc is rotated at high speed after being attached to the electric grinder. [Brief explanation of the drawings]

[0021] [Figure 1] 1(a) is a diagram showing various forms of conventional electric sanders, and FIG. 1(b) is a photograph showing the process of replacing sandpaper by adhering it to a disk according to the conventional technology. [Figure 2]1A and 1B are plan and front views of an abrasive disc according to the present invention. [Figure 3] (a) is a diagram showing the state before the abrasive disc of the present invention is fastened to an electric sander, and (b) is a diagram showing the state in which the abrasive disc of the present invention is fastened to an electric sander and completely adhered. [Figure 4] 1 is a cross-sectional view of the abrasive disc of the present invention taken along the a-a' section. [Figure 5] 1 is a cross-sectional view of the aa' section of an abrasive disc according to the present invention, showing the degree of curvature formed in each section. DETAILED DESCRIPTION OF THE INVENTION

[0022] The specific features of the present invention, including the problems to be solved, the means for solving the problems, and the effects of the present invention, are included in the following examples and drawings. The advantages and features of the present invention, as well as the methods for achieving them, will become clear from the following examples, which will be described in detail with reference to the accompanying drawings.

[0023] As shown in FIG. 2, the abrasive disc 1 detachably mounted on an electric grinder P according to the present invention has a high adhesion efficiency and includes a plate portion 10 made of a circular metal plate, a sanding portion 20 on one side of the plate portion 10 where an abrasive is formed so as to form an abrasive surface, and a fastening portion 30 formed in the form of a through-hole at the center axis of the plate portion 10 and formed in a shape that makes it easy to fasten to the electric grinder P. The plate portion 10 has a gentle curvature K so that a convex surface is formed on the sanding portion 20 side where the abrasive surface is formed, and is characterized in that it elastically adheres to the electric grinder P when fastened to the electric grinder P.

[0024] First, the plate portion 10 is made of a circular metal plate material.

[0025] It goes without saying that the plate portion 10 must be configured to have a size that allows it to be fastened to the electric sander P, and must be formed to have a thickness that allows it to be easily fastened without impeding the sanding function.

[0026] Here, the plate portion 10 is formed with a surface of gentle curvature so that a convex surface is formed in the direction of the sanding portion 20 side where the polishing surface is formed.

[0027] This is to ensure that after the plate portion 10 is fastened to the electric grinder P, the tight contact state can be easily maintained for a long period of time even during high speed rotation.

[0028] As shown in FIG. 3(a), the plate part 10 is configured to have a convex surface on the sanding part 20 side, so that when it is fastened to the electric sander P, it is formed to be elastically and closely coupled as shown in FIG. 3(b).

[0029] Here, it goes without saying that the plate portion 10 must have a surface with a predetermined curvature, and must be formed of a material and structure with sufficient elasticity to be able to elastically adhere to a flat surface as shown in Figure 3(b) when fastened, and to restore the curvature to the shape shown in Figure 3(a) when released.

[0030] If the plate portion of the grinding disc is in the form of a simple plane as in the conventional case, when it is attached to the electric grinding machine P and grinding work is performed at high speed for a long period of time, deformation due to heat, deformation due to centrifugal force, deformation due to continuous local pressure (grinding area) occurs, and it often becomes upside down or bends.

[0031] Therefore, in order to prevent this, it is preferable to form a curvature in the plate portion 10.

[0032] Here, when a curvature is formed to form a convex surface in the direction in which the polishing surface of the plate portion 10 is formed, if the plate portion 10 is formed in a general convex shape, depending on the degree of curvature, the plate portion 10 may be turned over when fastened or may not be in complete contact with the electric polishing machine, making it difficult to form a uniform polishing surface.

[0033] Specifically, the curvature K is maintained at a constant level over the entire surface, and if the value of the curvature K is too high, the joint will be turned over during the fastening process.

[0034] In addition, if the curvature K is maintained at a certain level, and if the value of the curvature K is too low, the contact surface does not completely contact with the contact surface, and a space is formed in the center due to the elastic force, making it difficult to maintain complete contact.

[0035] Therefore, it is preferable that the plate portion 10 is formed in a shape in which the curvature K gradually and continuously decreases and converges to 0 as it approaches the outer circumferential surface portion based on the cross section.

[0036] Specifically, as shown in Figure 4, the plate portion 10 is formed to have a structure in which the value of curvature K decreases as it approaches the outer peripheral surface, based on the cross section, and as shown in Figure 5, the curvature K near the central axis portion A of the plate portion 10 is formed to be 0.0015 to 0.0025.

[0037] It is preferable that the curvature K of the outer peripheral surface portion B of the plate portion 10 is a plane that converges to 0, and the radius of curvature between the central axis portion A and the outer peripheral surface portion B of the plate portion 10 should be configured to have a shape that gradually and continuously decreases as it goes toward the outer peripheral surface portion.

[0038] As mentioned above, the reason why the curvature K decreases toward the outer peripheral surface B of the plate portion 10 is that if a convex surface is simply formed with a constant curvature K, it is difficult to form a perfect contact surface (flat surface) when fastened to the electric grinding machine P.

[0039] However, when the plate portion 10 is formed to have a curvature K that gradually decreases toward the outer peripheral surface portion B as in the present invention, a stable contact surface can be easily formed without the occurrence of an inverted state.

[0040] Of course, the detailed information may vary depending on the mechanical properties of the material used, such as elasticity, bending strength, and brittleness, but when formed into the above-mentioned structure, it adheres perfectly to the surface to which it is attached and can maintain its shape even during high-speed rotation.

[0041] Next, the sanding unit 20 is provided with an abrasive material on one side of the plate unit 10 so that a polishing surface is formed.

[0042] Here, the abrasive material can be made of any material that can polish metal and wood.

[0043] In addition, the sanding unit 20 may be formed in any shape as long as the abrasive can be stably formed.

[0044] In addition, the sanding part 20 may be configured to be integrated with the plate part 10 by using a ceramic material mixed during the manufacturing process of the plate part 10 .

[0045] The plate unit 10 and the sanding unit 20 may be formed separately and configured to be attachable and detachable, or more preferably, the plate unit 10 and the sanding unit 20 may be integrally formed and manufactured as a single item.

[0046] Therefore, instead of the conventional method of adhering abrasive paper to an electric sander P and then removing it, the plate part 10 and the sanding part 20 can be easily attached and detached as an integral part using a connecting element such as bolting, thereby improving the convenience of use.

[0047] Of course, if the wear surface of the sanding section is in usable condition, it can be reused for further use.

[0048] Next, the fastening part 30 is formed in the form of a through hole on the central axis of the plate part 10, so that the plate part 10 can be easily fastened to the electric grinder P.

[0049] The fastening portion 30 may be configured in any shape as long as it can be easily fastened to the rotary shaft of the electric grinder P.

[0050] As such, it will be understood that the technical configuration of the present invention described above can be embodied in other specific forms by a person skilled in the art to which the present invention pertains without changing the technical idea or essential features of the present invention.

[0051] Therefore, the above-described embodiments should be understood to be illustrative in all respects and not limiting. The scope of the present invention is determined by the claims below rather than the above detailed description, and all changes and modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention. [Explanation of symbols]

[0052] 1 abrasive disc 10 Board part 20 Sanding Department 30 Fastening part A Center shaft part B Outer surface area P Electric sander

Claims

1. a plate portion formed from a circular metal plate; a sanding unit in which an abrasive material is formed on one side of the plate unit so as to form a polishing surface; a fastening portion formed in the form of a through-hole on the central axis of the plate portion and configured to be fastened to the center of the rotary surface plate of an electric grinder, The plate portion has a gentle curvature K so that a convex surface is formed on the sanding portion side where the polishing surface is formed, and the curvature K is formed in a shape that continuously decreases from the central axis portion to the outer circumferential surface portion based on the cross section, and when the fastening portion is fastened to the center of the rotary surface plate, the other side surface elastically adheres to the rotary surface plate.

2. 2. The grinding disc detachable from an electric grinder according to claim 1, wherein the maximum curvature of the central shaft portion of the plate portion is 0.0015 to 0.0025 based on the cross section, the curvature of the outer peripheral surface portion converges to 0, and the curvature changes so as to become continuously smaller from the central shaft portion to the outer peripheral surface portion.

3. 2. The abrasive disc detachable from an electric grinder according to claim 1, wherein the plate portion and the sanding portion are integrally formed.

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