File

Abstract

If the shape of the file holder is cylindrical, the force of pressing in the normal direction is small when holding that part, so friction is less likely to occur, and as a result, it is not suitable for long-term work and makes you more likely to get tired. As a result, it becomes difficult to work on small areas. [Solution] A file 1 is provided which includes a first side 4 extending vertically and a second side 5 different from the first side, the second side forming the hypotenuse of an approximately right triangle with the first side as the opposite side, and the angle of the hypotenuse is changed from a point D located midway on the hypotenuse.

Description

[Technical field]

[0001] This invention relates to a file intended for polishing recreational items, small items, and other industrial items. [Background technology]

[0002] In the prior art, when using this type of file, the file is held in the dominant hand and the object to be polished is held in the non-dominant hand to perform the polishing work. Depending on the size, shape, etc. of the object to be polished, the polisher is forced to perform very detailed and complicated work, and as a result, the work is often performed for a long time. In other words, the efficiency and quality of the polishing work using a file is greatly influenced by how the file is held.

[0003] Model Patent Registration No. 3183565 describes an invention which comprises a flat file and a connecting member which secures the tip of the file, the connecting member being detachable and having a motor built into it, with the aim of making it possible to easily sharpen blades without having to worry about fine adjustments to the position relative to the blade. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3183565 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional technology, the shape of the handle of the file is cylindrical. When holding this cylindrical part, the force pressing in the normal direction is small, so friction is difficult to generate, and as a result, it is not suitable for long-term work and easily makes the user tired. As a result, it is difficult to work on small areas.

[0006] The purpose of this device is to hold the file at a different angle to one side of the file, increasing the normal force (friction force) to that side. Also, by adjusting the angle of the fingers, part of the shear force due to gravity is converted into normal force, weakening the slipping force. As a result, blind movement of the file is prevented. As a result, very fine or complicated work can be done regardless of the size, shape, etc. of the object to be polished. [Means for solving the problem]

[0007] In order to achieve the above object, the file includes a first side extending vertically and a second side different from the first side, the second side forming the hypotenuse of an approximately right triangle with the first side as the opposite side, and the hypotenuse is provided with a file whose angle is changed from a point midway on the hypotenuse. Effect of the Invention

[0008] According to this invention, by setting a different angle to one side of the file, the force (friction force) in the normal direction between the finger and that side is increased. In addition, by adjusting the angle of the finger, part of the shear force due to gravity is converted into a normal force, and the sliding force is weakened. As a result, the file is prevented from moving blindly. In other words, very fine and complicated work is possible regardless of the size, shape, etc. of the object to be polished. In other words, stable operation of polishing work on the object can be realized. This makes it easier to work on small parts and achieve a precise finish. In addition, by holding it properly, it can contribute to reducing fatigue during long hours of work. As a result, the purpose is that the worker can work more comfortably, which leads to improved productivity. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a front view of a file according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side view of the file shown in FIG. [Diagram 3] FIG. 2 is a rear view of the file shown in FIG. [Figure 4] FIG. 4 is a rear view of a file according to a second embodiment of the present invention. [Diagram 5] FIG. 10 is a rear view of a file according to a third embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the file 1 according to the present embodiment will be described with reference to Figures 1 to 3. For convenience, parts having the same functions are given the same reference numerals and their description will be omitted.

[0011] This embodiment relates to a file 1 intended for polishing ornaments, entertainment items, small industrial items, and the like.

[0012] The materials that can be used for the file 1 include glass, non-ferrous metals, hardened steel, polycrystalline sintered diamond, reinforced plastics, carbon, hard rubber, alumina, zirconia, silicon nitride, silicon carbide, high-speed steel, ceramics, etc. The manufacturing method thereof is a known example.

[0013] The file 1 in this embodiment is made of glass. It is mainly manufactured using soda-lime glass, borosilicate glass, etc. Soda-lime glass is relatively inexpensive and easy to process, while borosilicate glass has excellent impact resistance and heat resistance, allowing for more precise processing. The thickness of the glass is appropriately changed depending on the object to be polished. In other words, it is changed according to the shape of the object to be polished and the area to be cut. Specifically, a thinner thickness is suitable for polishing fine areas, and a thicker thickness is suitable for polishing wide areas, so the thickness may be appropriately changed.

[0014] The file 1 is formed into a desired shape using a cutting tool such as a diamond cutter or a laser cutter. When forming a file with a curved surface or a somewhat complicated shape, sandblasting, acid etching, or the like is performed.

[0015] The polishing surface of file 1 uses diamond abrasive grains or aluminum oxide abrasive grains, etc. The roughness of the abrasive grains is determined by factors such as the hardness of the object to be polished, and is selected depending on how much of the object needs to be polished. Once the roughness of the abrasive grains has been determined, they are applied to the front or back of file 1 to create polishing surface 2. This can be done by fixing the abrasive grains to the front or back of file 1 with an adhesive, or by baking the abrasive grains directly onto the front or back. Note that the polishing surface 2 in the drawings has been marked with light ink.

[0016] The shape of the file 1 will be described. FIG. 1 is a plan view of the file 1. The file 1 has an elongated plate-like shape as a whole. It has an inverse tapered shape that is thin at one end, tip A, and thickens toward the other end, end B. Tip A has a shape of a roughly right-angled triangle. If tip A is the apex 3 of the right-angled triangle, it is composed of a first side 4 that extends horizontally from apex 3 toward end B, and a second side 5 that forms a hypotenuse from apex 3 toward end B and is different from the first side 4. The second side 5 has a line segment BC that is parallel to the first side 4 from an arbitrary point C on that line segment. Work is performed by holding this line segment BC.

[0017] The line segment AC is formed by changing the angle of an arbitrary point D on the line segment. In detail, the line segment AC is composed of two lines, namely, the line segment AD and the line segment CD. The angles formed by the lines are explained below. The angle α formed by the first side 4 and the line segment AD starting from the vertex 3 is 6 degrees. The angle β formed by the first side 4 and the line segment CD starting from an arbitrary point D is 16 degrees. As the angles α and β are different, when the file 1 is held, the normal force (friction force) between the finger and the side increases. In addition, by adjusting the angle of the finger, part of the shear force due to gravity is converted into a normal force, and the sliding force is weakened. As a result, the file is prevented from moving blindly. As a result, very fine work and complicated work are possible regardless of the size, shape, etc. of the object to be polished.

[0018] Furthermore, the shape of the file 1 is asymmetrical because the tip A of the file 1 is formed in the shape of a roughly right-angled triangle when viewed in a plane. By forming the tip A of the file 1, specifically the polishing surface, asymmetrically, various ways of holding the file are possible, making it easier to perform fine work even if the object to be polished has a complex shape. Also, because the way the file 1 is held can be changed alternately between the left and right, it is possible to avoid working in the same position for a long period of time, and as a result, the strain on specific parts of the body, such as the hands, can be reduced. The end B of the file 1 is configured symmetrically.

[0019] 3 is a rear view of the file 1. The entire area is the abrasive surface 2. However, instead of showing the entire area, the area may be limited as in the front view.

[0020] The following describes a procedure for using the file 1 on a toy to be polished. Note that this is merely an example, and the procedure is not limited to this.

[0021] The file is held in the dominant hand and the object to be polished is held in the non-dominant hand to perform the polishing work. When holding the file 1, the index finger is placed on any point D on the line segment of the second side 5, and the thumb and middle finger hold both sides of the first side 4. These three fingers securely fix the file 1 to the hand, preventing it from moving blindly during the polishing work and allowing delicate work to be performed. In addition, since the second side 5 is formed of sides with different angles, the force (friction force) in the normal direction between the fingers and the side increases. In addition, by adjusting the angle of the fingers, part of the shear force due to gravity is converted into a normal force, and the sliding force is weakened. As a result, the file is prevented from moving blindly.

[0022] (Effects of this embodiment) In this embodiment, since the second side 5 is not a straight line but is composed of two sides with different angles, when the file 1 is held, the force (friction force) in the normal direction between the finger and the side increases. In addition, by adjusting the angle of the finger, a part of the shear force due to gravity is converted into a normal force, and the sliding force is weakened. As a result, the file is prevented from moving blindly. In other words, very fine work and complicated work are possible regardless of the size, shape, etc. of the object to be polished. As a result, very fine work and complicated work are possible regardless of the size, shape, etc. of the object to be polished. In other words, stable operation of polishing work on the object can be realized. This makes it easier to work on small parts and achieves a precise finish. In addition, by holding it properly, it can contribute to reducing fatigue during long-term work. As a result, the worker can work more comfortably, which leads to improved productivity.

[0023] (Second embodiment different from the first embodiment) In this embodiment, the differences from the first embodiment will be described.

[0024] The second side 5 will be described with reference to FIG. 4. The length of the line segment AC in the second side 5 is the same as in the first embodiment, but the position of the arbitrary point D in the line segment AC is different. Specifically, the position of the arbitrary point D is close to the arbitrary point C, and as a result, the angle β formed by the first side 4 and the line segment CD starting from the arbitrary point D is 0°. In other words, since the length of the line segment CD is different, the angle β is different from that in the first embodiment, and therefore when the file 1 is held, the force pressing perpendicularly to the line segment CD increases, so that a normal force (friction force) is likely to occur. As a result, it is possible to hold it in a stable manner without slipping. Note that multiple types of files 1 may be provided so that the length and angle of the line segment AC or the line segment CD can be selected according to the size of the user's hand and the thickness of the fingers.

[0025] (Third embodiment different from the first embodiment) In this embodiment, the differences from the first embodiment will be described.

[0026] The second side 5 will be described with reference to FIG. 5. The length of the line segment AC on the second side 5 is the same as in the first embodiment, but the position of the arbitrary point D on the line segment AC is different. Specifically, the position of the arbitrary point D is horizontal to the arbitrary point C, and as a result, the angle β formed by the first side 4 and the line segment CD starting from the arbitrary point D is 90°. That is, the first side 4 and the line segment CD are perpendicular to each other. That is, when the file 1 is held, the line segment CD is configured in the horizontal direction, so that the force pressing in the horizontal and vertical directions is large, and frictional force is easily generated, and as a result, it is possible to hold it in a stable manner without slipping. Note that multiple types of files 1 may be provided so that the length and angle of the line segment AC or the line segment CD can be selected according to the size of the user's hand and the thickness of the fingers. Although not shown, the line segments AC and CD may be configured in perpendicular directions.

[0027] (Other Examples) The second side 5 is not limited to a straight line and may be a curved line. Examples of shapes formed by curved lines include the following shapes. Specifically, the shapes include a shape in which the line segment AC describes a gentle curve and the line segment CD describes a straight line or another curve, a shape in which the line segments AC and CD curve in different directions, a shape in which the line segments AC and CD intersect midway, and the like.

[0028] Furthermore, one of the line segments AC and CD may be a straight line and the other a curved line. Specifically, the shape may be such that the line segment AC is a straight line and the line segment CD is a curved line, or the line segment AC is a curved line and the line segment CD is a straight line.

[0029] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit and technical concept of the present invention.

[0030] Although the above-mentioned file 1 has been described as an example of an ornament, a recreational item, a small item, etc., it may also be used as a beauty product such as a nail file.

[0031] In addition, in the above description, when the external dimensions or sizes are described as "same", "equal", "different", etc., the description does not mean in the strict sense. In other words, "same", "equal", and "different" mean "substantially the same", "substantially equal", and "substantially different", allowing for design and manufacturing tolerances and errors.

[0032] In addition to the above, the above-mentioned embodiments and the methods according to the modifications may be appropriately combined and used. Although not illustrated individually, the present invention may be implemented with various modifications without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0033] 1 File 2 Polished surface 3. Vertex 4. First Side 5. Second Side A tip B-terminus C Any point D Any point

Claims

1. A file with abrasive surfaces on one or both sides for polishing ornaments, entertainment items, small items, and other industrial items, The file is A first side extending vertically; a second side different from the first side, The second side forms the hypotenuse of a substantially right-angled triangle with the first side as the opposite side, and the angle of the hypotenuse changes at a point midway along the hypotenuse.

2. 2. The file of claim 1, A file characterized by its asymmetrical shape.

3. 2. The file of claim 1, A file, wherein the second side is a straight line.

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