Nail file

Abstract

To provide a nail file that can be folded compactly and carried, is suitable for daily use, and is put to a finger for filing.SOLUTION: In a nail file, a body is formed of a sheet-like file having a right-angle triangular shape having a first acute angle part of 35° to 40°. The body is provided with three folding lines extending from a right angle vertex to the hypotenuse at an angle of dividing the right angle vertex of the body into four, one folding line with which the first acute angle can be folded into the inside of a triangular pyramidal shape formed by folding the three folding lines, and one insertion part to which a second acute angle part having an angle of 55° to 50° of the body is inserted, so that the triangular pyramidal shape can be held.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a nail file suitable for carrying around at all times and for daily use. [Background technology]

[0002] People often bring a nail file to file their nails when traveling or at work. Many of the various nail files available today are portable, but many nail files that emphasize portability have also been devised. (Patent Documents 1 to 9)

[0003] Even when you're out and about, the tips of your nails can crack, so it's convenient to carry a nail file with you in case you need to deal with the problem immediately. However, since nails don't always crack when you're out and about, you end up carrying an unnecessary item with you every time you go out. Therefore, nail files have been devised that are made of sandpaper or abrasive sheets, which are very light, thin, and pose no risk of breakage, and are inserted into the fingers for everyday use. (Patent Documents 10 to 13) [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 63-110138 [Patent Document 2] Jitsuzen Showa 49-082965 [Patent Document 3] Jitsuzen Showa 50-024378 [Patent Document 4] Jitsuzen Showa 51-158879 [Patent Document 5] Jitsuzen Showa 52-000371 [Patent Document 6] Jitsuzen Showa 54-004184 [Patent Document 7] Jitsuzen Showa 62-130503 [Patent Document 8] Actual total 02-082207 [Patent Document 9] Actual total 03-017713 [Patent Document 10] Design registration 1645703 [Patent Document 11] Design registration 1648370 [Patent Document 12] Design registration 1657345 [Patent Document 13] Design registration 1696261 Summary of the Invention [Problem to be solved by the invention]

[0005] However, known nail files using abrasive paper or abrasive sheets are formed into a curved file surface by rolling the file before use, and the optimal standard for the degree of rounding is unclear to the user. Furthermore, methods for maintaining the conical shape include inserting one corner into a notch (Patent Document 10), folding one corner inward (Patent Document 11), or fastening with a clip or the like (Patent Document 12), which have the problem of making it difficult to maintain the conical shape during use. Those that utilize the adhesive function of hook-and-loop fasteners (Patent Document 13) have the problem of the hook-and-loop fastener's adhesive surface sticking to fuzzy clothing, etc. Furthermore, once rolled, abrasive paper or abrasive sheets are difficult to return to their original flat state, making it difficult to carry them around after use. The present invention has been made to solve such problems in the prior art. [Means for solving the problem]

[0006] The nail file has a main body made of a sheet-like file with a first acute angle portion in the shape of a right triangle of 35° to 40°, three folding lines extending from the right-angled apex of the main body to the hypotenuse at angles that divide the right-angled apex of the main body into four equal parts, one folding line in the triangular pyramid shape formed by folding the three folding lines so that the first acute angle portion can be folded inside, and one insertion portion that can hold the triangular pyramid shape by inserting a second acute angle portion of the main body with an angle of 55° to 50°. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a nail file that is suitable for use on the go and in everyday life, is portable, can be folded into a three-dimensional or flat shape, and is used by inserting it into a finger. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view of the file surface of the main body in Example 1 of the present invention; [Figure 2] 1 is a perspective view of a main body showing an assembly sequence according to a first embodiment of the present invention; [Figure 3] FIG. 1 is a perspective view of a main body showing the position of a folding line and the relationship between overlapping side surfaces in the first embodiment of the present invention; [Figure 4] FIG. 10 is a perspective view of a main body in which a second acute-angled portion is inserted into an insertion portion from the file surface side in the first embodiment of the present invention; [Figure 5] FIG. 10 is a perspective view of the main body in which the second acute-angled portion is inserted into the insertion portion from the rear side of the file in the first embodiment of the present invention; [Figure 6] FIG. 1 is a perspective view of a main body during assembly according to a first embodiment of the present invention; [Figure 7] FIG. 1 is a perspective view of a main body during assembly according to a first embodiment of the present invention; [Figure 8] FIG. 1 is a perspective view of a main body after assembly according to a first embodiment of the present invention; [Figure 9] FIG. 1 is a perspective view of the inside of a main body after assembly according to the first embodiment of the present invention; [Figure 10] A plan view of the back surface of the file body with the folding line folded in a mountain fold in Example 1 of the present invention. [Figure 11] FIG. 1 is a perspective view of a main body during assembly according to a first embodiment of the present invention; [Figure 12] FIG. 10 is a perspective view of a main body assembled by inserting the second acute-angled portion into the insertion portion from the file surface side in the first embodiment of the present invention; [Figure 13] FIG. 10 is a perspective view of the inside of the main body assembled by inserting the second acute-angled portion into the insertion portion from the file surface side in the first embodiment of the present invention; [Figure 14]FIG. 10 is a perspective view of the main body assembled by inserting the second acute-angled portion into the insertion portion from the rear side of the file in the first embodiment of the present invention; [Figure 15] FIG. 10 is a perspective view of the inside of the main body assembled by inserting the second acute-angled portion into the insertion portion from the rear side of the file in the first embodiment of the present invention; [Figure 16] FIG. 1 is a plan view of a main body folded into a flat shape suitable for carrying in the first embodiment of the present invention; [Figure 17] FIG. 10 is a perspective view of a main body in which the shape of the insertion portion is changed in the second embodiment of the present invention; [Figure 18] A plan view of the back surface of the file body in Example 2, which has a different acute angle from Example 1 of the present invention. [Figure 19] Reference diagram for use in Example 1 of the present invention DETAILED DESCRIPTION OF THE INVENTION

[0009] The present embodiment will be described below. The main body is made of a sheet-like file with a first acute angle portion in the shape of a right triangle of 35° to 40°. Three fold lines extend from the right-angled apex of the main body to the hypotenuse at angles that divide the right-angled apex of the main body into four equal parts. In the triangular pyramid shape formed by folding the three fold lines, one fold line can be added inside the first acute angle portion, and one insertion portion can be inserted into which the second acute angle portion of the main body, which is 55° to 50°, can be inserted to maintain the triangular pyramid shape. The folding line is positioned so that the first acute angle portion folded along it can act as a stopper to maintain the triangular pyramid shape, and the second acute angle portion can be inserted into the insertion portion from two directions, from the file surface side of the main body and from the back side of the file. [Example]

[0010] FIG. 1 shows a plan view of the main body of the first embodiment of the present invention. The dots indicate the file surface, and the dashed lines on the file surface indicate mountain fold lines. The main body 1 of the first embodiment of the present invention shown in FIG. 1 is in the shape of a right triangle with two interior angles of 40° and 50°, and has three fold lines 5a, 5b, and 5c, one folding line 6, and one insertion portion 7, which is a heart-shaped cutout hole. The main body 1 of the first embodiment of the present invention is made of sandpaper.

[0011] The three fold lines 5a, 5b, and 5c on the main body 1 in Example 1 of the present invention are formed from the right-angled vertex c of the main body 1 to the hypotenuse 4 at an angle that divides it into four equal parts, and these three fold lines 5a, 5b, and 5c define four triangles (acd), (cde), (cef), and (bcf) on the main body 1.

[0012] The four triangles (acd), (cde), (cef), and (bcf) shown in the plan view of the main body 1 in Figure 1 are the faces indicated by W, X, Y, and Z that become the side faces that form the triangular pyramid shape when the main body 1 is assembled into a triangular pyramid-shaped nail file.

[0013] In Example 1 of the present invention, of the four triangular faces (acd), (cde), (cef), and (bcf) defined on the main body 1 by three fold lines 5a, 5b, and 5c, one fold line 6 is provided on the face of the triangle (bcf) with the largest area, thereby defining a triangle (bgh) with an acute angle portion 9 as one of its corners.

[0014] In the main body 1 in the first embodiment of the present invention, one insertion portion 7 is provided at a position sandwiched between the folding line 5c and the folding line 6, and this insertion portion 7 is a hole portion, or a cutout portion, provided in the main body 1. The outline 7a of the insertion portion, which is the shape of the insertion portion 7 in the first embodiment, is heart-shaped.

[0015] As shown in Figure 2, in the first embodiment of the present invention, the main body 1 is assembled into a triangular pyramid-shaped nail file by mountain-folding the folding lines 5a, 5b, 5c and the folding line 6. At this time, the two sides W and Z overlap to form a hollow three-dimensional object in the shape of a triangular pyramid. This triangular pyramid shape in the first embodiment of the present invention refers to a three-dimensional shape that is cone-shaped, and has some differences from the triangular pyramid that is a mathematical three-dimensional figure.

[0016] In the first embodiment of the present invention, when assembling into a triangular pyramid shape as shown in FIG. 2, by mountain-folding the folding line 6, it is possible to fold a triangular (bgh) face with the acute angle portion 9 as one corner inside the assembled triangular pyramid shape.

[0017] In Example 1 of the present invention, as shown in FIG. 3, the folding line 6 is the line connecting contact point g and contact point h on side Z, which is the boundary line dividing overlapping sides Z and W into single and double sections when assembled.

[0018] 9, in the first embodiment of the present invention, the nail file is assembled into a triangular pyramid shape, and the back surface of the file of the triangle (bgh) with the acute angled portion 9 of the main body as one angle folded inside the triangular pyramid shape along the folding line 6 is folded so that it comes into contact with the back surface of the file on the side W. At this time, the tip of the acute angled portion 9 of the main body crosses the folding line 5c and catches on the back surface of the file on the side Y, which acts as a stopper and allows the triangular pyramid shape to be maintained.

[0019] FIG. 10 shows a plan view of the main body 1 in the first embodiment of the present invention, in which the folding line 6 is folded in a mountain fold, and shows that the tip of the triangle (bgh), which is part of the side Z folded along the folding line 6, extends beyond the fold line 5c to the side Y.

[0020] As shown in Figures 4, 12, and 13, in Example 1 of the present invention, the main body 1 is assembled into a triangular pyramid shape by folding three fold lines 5a, 5b, and 5c, and the triangular pyramid shape of the nail file is maintained by inserting the acute angled portion 8 into the insertion portion 7 from the file surface side. Also, as shown in Figs. 5, 14 and 15, a triangular pyramidal nail file can be formed and held by inserting the acute angled portion 8 into the insertion portion 7 from the back side of the file.

[0021] In the first embodiment of the present invention, when the folding line 6 is folded to form and hold a triangular pyramid-shaped nail file as shown in Fig. 8, the side Z overlaps the side W. Also, when the acute-angled portion 9 is inserted into the insertion portion 7 from the back side of the file to form and hold a triangular pyramid-shaped nail file as shown in Figs. 5, 14, and 15, the side Z also overlaps the side W.

[0022] In the first embodiment of the present invention, when the acute angled portion 8 is inserted into the insertion portion 7 from the file surface side to form and hold a triangular pyramid-shaped nail file as shown in Figures 4, 12, and 13, the side W overlaps the side Z. This makes it possible to file nails using the file surface of the side W as well.

[0023] The size of the main body 1 in the first embodiment of the present invention can be implemented with the length of the opposite side 2 ranging from 6 cm to 12 cm, but the length of the opposite side 2 is preferably from 9 cm to 11 cm.

[0024] When selecting the sandpaper, which is the main body 1 in Example 1 of the present invention, the base material, adhesive, and abrasive grains are not limited and can be implemented, but since the present invention is for filing nails, which are part of the human body, it is preferable to select sandpaper that uses garnet abrasive material, a natural mineral that is non-toxic and does not contain free silica, as the abrasive grains, and that uses a base adhesive and a top coat adhesive, both of which are glue, as the adhesive, as this has the effect of not restricting use by people who have a constitution that shows hypersensitive reactions to chemicals.

[0025] In selecting the sandpaper that is the main body 1 in Example 1 of the present invention, sandpaper based on Japanese paper is selected, which is preferable because the excellent flexibility of Japanese paper makes it less likely for the surface of the file to crack at the folded part. In addition, the excellent flexibility of Japanese paper makes it fit well with the inserted finger, which is preferable in that it can enhance the ease of use for sanding nails and the feeling of sanding more freely.

[0026] When selecting the sandpaper that is the main body 1 of the present invention, the grit size may be fine, medium, or coarse.

[0027] Figure 16 shows a plan view of main body 1 folded in half by mountain folding along folding lines 6 and 5b. By folding it in this way, it becomes possible to carry it around, for example, by placing it between a wallet or a notebook.

[0028] After assembling the main body 1 of the present invention into a triangular pyramid shape, by pulling out the folded acute angle part 9 or the acute angle part 8 inserted into the insertion part, the triangular pyramid shape collapses and changes from a three-dimensional to a flat shape, making it possible to carry it in a flat shape. [Example]

[0029] The shape of the cutout portion of the insertion portion 7 in the second embodiment of the present invention is such that, as shown in FIG. 17, the insertion portion 7 includes the length and position of 7b, and the outline 7a of the insertion portion 7 can be changed to implement the present invention.

[0030] The shape of the outline 7a of the insertion portion 7 in Example 2 of the present invention is not limited to a heart shape as in Example 1, but can also be a moon or star shape as shown in Figure 17, and can also be a square, triangle, polygon, circle, oval, shape resembling an animal, shape resembling a plant, shape resembling an object, shape resembling a letter, etc.

[0031] Figure 18(A) shows a plan view of Example 2 of the present invention in which the angle of the acute angle portion 9 is 35° and the folding line 6 is folded in a mountain fold, showing that by folding the folding line 6 in a mountain fold, the tip of the main body acute angle portion 9 crosses the fold line 5c and catches on the back surface of the file on the side Y. As in Example 1 of the present invention in which the angle of the acute angle portion 9 is 40° as shown in Figure 18(B), the tip of the main body acute angle portion 9 crosses the fold line 5c and catches on the back surface of the file on the side Y, which acts as a stopper and allows the triangular pyramid shape to be maintained. The angle of the acute angle portion 9 of the present invention can be set to an angle between 35° and 40°.

[0032] In the second embodiment of the present invention, the shapes and symbols are the same as those in the first embodiment except for the modified portions.

[0033] As shown in the usage image diagram of Example 1 in FIG. 19, the present invention can be used by inserting it into a finger, and the user can insert any finger. [Explanation of symbols]

[0034] 1 Polished surface of the main body 2 opposite sides 3 Adjacent side 4 Hypotenuse 5a A mountain fold line on the line connecting the right angle vertex c and the tangent point d 5b A mountain fold line on the line connecting the right angle vertex c and the tangent point e 5c A mountain fold on the line connecting the right angle vertex c and the tangent point f 6. A fold line on the line connecting point g and point h 7 Insertion part 7a Outline of insertion part 7b Width and length of insertion part and its position on the body 8 Second acute angle with an internal angle of 50 degrees 9 First acute angle with an internal angle of 40 degrees 10 Back of the polished surface of the main body 11 Valley folds appearing on the back of the polished surface of the main body a vertex, b vertex, c right-angle vertex d contact, e contact, f contact, g contact, h contact, i contact, j contact W side (triangle cad) X side (triangle cde) Y side (triangle cef) Z side (triangle cfb)

Claims

1. A body made of a sheet-like file having a first acute angle portion in the shape of a right triangle of 35° to 40°; Three fold lines extending from the right angle apex of the body to the hypotenuse at an angle that divides the right angle apex into four equal parts; In the triangular pyramid shape formed by folding the three fold lines, one fold line is formed so that the first acute angle portion can be folded inside the fold line; The nail file is provided with one insertion portion into which the second acute angle portion of the body, which is inclined from 55° to 50°, can be inserted to retain the triangular pyramid shape.

2. The nail file according to claim 1, wherein the folding line is provided at a position where the first acute angle portion folded along the folding line can serve as a stopper for maintaining the triangular pyramid shape.

3. 2. The nail file according to claim 1, wherein the insertion portion is an insertion portion that allows the second acute angle portion to be inserted from two directions, that is, the file surface side and the file back side of the body.

Images