Sharpener

Abstract

To provide a convenient sharpener for sharpening fishhooks. [Solution] The sharpener 1 comprises a high-grain grindstone 3 formed with a roughly L-shaped cross section having a long side 3a and a short side 3b, and a similarly formed grindstone 4 with a relatively low grit size. The joint surfaces of the high-grain grindstone 3 and the low-grain grindstone 4 are joined facing each other, and grooves 5 and 6 are provided on the outside of the short sides 3b and 4b of the grindstones 3 and 4, respectively.

Description

[Technical Field]

[0001] This invention relates to a sharpener for sharpening fishing hooks. [Background technology]

[0002] Conventionally, when fishing, people have carried sharpeners for sharpening fishhooks, as disclosed in Patent Documents 1 and 2, for example. The sharpener disclosed in Patent Document 1 has a mountain-shaped grinding groove formed on the top surface of a grinding stone that is small enough to be held in one hand, and is configured so that the tip of the hook is sharpened by pressing and sliding the grinding groove. It is also possible to sharpen the hook by pressing and sliding the grinding stone against the surface of the grinding stone.

[0003] The sharpener disclosed in Patent Document 2 has cylindrical grinding stones formed on both ends of a diamond-shaped grinding stone, and is configured so that the cylindrical grinding stones can be used to grind along the shape of a fishhook. One triangular portion of the diamond-shaped grinding stone is used for rough grinding, and the other triangular portion is used for fine grinding. Furthermore, each of the rough grinding stone and the fine grinding stone has a V-shaped notch (groove) formed in it, so that the needle tip can be inserted and slid to grind the needle tip. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-308454 [Patent Document 2] Utility Model Application Publication No. 6-80556 Summary of the Invention [Problem to be solved by the invention]

[0005] The sharpener disclosed in Patent Document 1 can only be used with a single grit size whetstone. Therefore, when sharpening with different grit sizes, such as coarse and fine, a separate whetstone must be prepared, which is inconvenient. Bringing multiple whetstones to a fishing spot is inconvenient when moving between fishing spots or when using them suddenly. Furthermore, the sharpener disclosed in Patent Document 2 has grooves formed on the wide portion of the sharpening surface, making it difficult to sharpen multi-pointed or very small fishhooks because it is difficult to see what is in front of the sharpening tool and to guide the tip into the grooves. Additionally, the wide surface of a whetstone is typically used to sharpen large fishhooks or parts of the hook other than the tip. However, the grooves can get in the way when using the wide surface, such as accidentally getting caught on something, and the powder generated during sharpening can easily get into the grooves, resulting in inconvenience.

[0006] The present invention has been made in response to the above-mentioned problems, and aims to provide a convenient sharpener. [Means for solving the problem]

[0007] The sharpener of the present invention comprises a high-grain grinding stone formed with a roughly L-shaped cross section having a long side and a short side, and a similarly shaped grinding stone with a relatively low grit size, with the joining surfaces of the high-grain grinding stone and the low-grain grinding stone facing each other and having grooves on the outside of the short side of each grinding stone.

[0008] The sharpener with the above-mentioned configuration is equipped with a high-grain whetstone and a similarly shaped, relatively low-grain whetstone, eliminating the need to carry multiple whetstones to the fishing spot. Furthermore, since the grooves for sharpening the fishhook are provided on the outer sides of the short sides of the high-grain whetstone and the low-grain whetstone, when sharpening the fishhook with the grinding surface of each whetstone, the fishhook will not get caught in the grooves, and powder is less likely to get into the grooves. [Effects of the Invention]

[0009] According to the present invention, a highly convenient sharpener can be obtained. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a plan view showing one embodiment of a sharpener. [Figure 2] An exploded view of the sharpener shown in Figure 1. [Figure 3] A diagram of the sharpening stone in use from the sharpener case shown in Figure 1 (a plan view showing the stone with a lower grit size). [Figure 4] (a) is a diagram showing grooves formed on a grinding stone with a low grit size, and (b) is a diagram showing grooves formed on a grinding stone with a high grit size. [Figure 5] A view of the sharpening stone in use from the sharpener case shown in Figure 1 (reverse view showing the side with higher grit). [Figure 6] FIG. 1 is an end view showing a state in which a grinding stone with a high grain size and a grinding stone with a low grain size are joined together. [Figure 7] 10(a) to 10(c) are cross-sectional views showing modified examples of the joining surface between a grinding stone with a high grain size and a grinding stone with a low grain size, respectively. [Figure 8] 10(a) to 10(d) are cross-sectional views showing modified examples of the groove. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the sharpener will now be described. In the following description of the sharpener, the base end side is defined as the side where the support part of the case is provided, the tip end side (end face) is defined as the opposite side, the front face is defined as the side where the grindstone with lower grit size is located, and the back face is defined as the side where the grindstone with higher grit size is located.

[0012] Hereinafter, one embodiment of the sharpener of the present invention will be described with reference to FIGS. The sharpener 1 of this embodiment includes a grindstone body 2 having a high-grain grindstone (fine grindstone) 3 and a relatively low-grain grindstone (coarse grindstone) 4, and a case 30 that houses the grindstone body 2. In this configuration, grindstones with relatively different grit sizes are provided so that grindstones are used after grinding with the coarse grindstone 4 and then finishing with the high-grain grindstone (fine grindstone) 3. Specifically, the grindstone 3 preferably has a grit size of, for example, 800 or more, and the grindstone 4 has a grit size of, for example, 100 to 400, preferably about 200, and each grindstone is made of ceramic.

[0013] The grinding wheel body 2 is integrated by joining the grinding wheels 3 and 4 at their respective joining surfaces, and in this embodiment, when the opposing surfaces of the grinding wheels 3 and 4 are fastened together and integrated, the overall shape is a rectangular parallelepiped. In this case, the integrated shape is not particularly limited, and can be appropriately modified, such as into a polygonal shape, as long as a wide grinding surface is obtained.

[0014] The following describes the configuration of the grindstones 3 and 4. Since the grindstones 3 and 4 of this embodiment are configured to have the same shape, the detailed structure will be mainly described for the grindstone 3 with a high grain size (for fine polishing).

[0015] The grinding wheel 3 is formed with a substantially L-shaped cross section having a long side 3a and a short side 3b. The long side 3a and the short side 3b are exposed portions defined in specifying the shape of the substantially L-shaped cross section, and the long side 3a is defined as the surface in the width direction when the grinding wheel body 2 is viewed from the end face side, and the short side 3b is defined as the surface in the thickness direction. The substantially L-shaped shape includes a state bent at 90 degrees, a state bent at a slight angle, and a shape in which the thickness varies.

[0016] The longitudinal surface 3a and the lateral surface 3b have a generally L-shaped cross section, and therefore their inner surfaces 3aa and 3ba serve as joining surfaces. The inner surfaces 3aa and 3ba of these grinding stones 3 are joined by bonding or the like to the inner surfaces 4aa and 4ba of the grinding stone 4 that are similarly formed on the longitudinal surface 4a and the lateral surface 4b, respectively, of the grinding stone 4 to be joined, and are integrated (see FIG. 4). Therefore, the inner surfaces 3aa and 3ba and the inner surfaces 4aa and 4ba of the grinding stones 3 and 4 are not exposed to the outside when integrated.

[0017] Grooves 5, 6 are provided on the outer sides of the shorter sides 3b, 4b of each grinding stone 3, 4 along the extension direction. These grooves 5, 6 have inner surfaces with the same grit size as the grinding stones 3, 4, and by fitting a fishhook (not shown) into these portions and sliding it in the extension direction, the outer hook surface of the fishhook can be polished. In this case, the grooves 5, 6 in this embodiment are formed with a V-shaped cross section (see Figure 8(a)), and when the fishhook is pressed against them, it is restricted by the opposing inner surfaces, allowing it to slide stably in the longitudinal direction of the groove without wobbling.

[0018] Of the joining surfaces of each grinding wheel 3, 4, the inner surfaces 3ba, 4ba on the shorter side are configured as flat surfaces, while the inner surfaces 3aa, 4aa on the longer side are configured as tapered surfaces that gradually become thinner toward the ends. That is, the inner surfaces 3aa, 4aa of each grinding wheel are formed with tapers 3T, 4T, respectively, so that the overall thickness of the grinding wheel body 2 does not change when joined. In addition, the grinding surfaces of each grinding wheel 3, 4 are formed in a rectangular, flat shape to ensure wide grinding surfaces 3A, 4A.

[0019] The case 30 is configured to accommodate the grinding wheel body 2 configured as described above in a rotatable manner. In this embodiment, the main body 30A of the case 30 has a wall 31a formed on the tip side, and openings 32a and 32b formed on both sides and the base end side without any walls. Also, an opening 32c is formed on the base end side of the grinding wheel body 2 without any walls. A rotation support part 35 is press-fitted and fixed to the grinding wheel body 2 and the base end side of the case 30, and the grinding wheel body 2 is configured to be stored in and removed from the case 30 so as to be rotatable 360° around its end as an axis.

[0020] When the grinding wheel body 2 is housed in the case 30, the grooves 5 and 6 formed in the grinding wheels 3 and 4 are exposed. That is, the groove 5 of the grinding wheel 3 is exposed from the opening 32a of the body 30A, and the groove 6 of the grinding wheel 4 is exposed from the opening 32b of the body 30A.

[0021] The main body 30A of the case 30 has approximately the same shape as the surfaces (grinding surfaces) 3A, 4A of each grinding wheel 3, 4, and when the grinding wheel main body 2 is housed in the case 30, the inner surface of the main body 30A and each grinding surface 3A, 4A face each other with a small gap between them.

[0022] Furthermore, a notch 30a is formed in the main body 30A of the case 30, which allows part of the grinding wheel body 2 to be pushed or pulled when the grinding wheel body 2 is housed therein. That is, by forming the notch 30a on the side edge of the main body 30A, the grinding wheel body 2 can be easily grasped, and the housed grinding wheel body can be easily pulled out and rotated around the rotation support part 35 to put it into use.

[0023] Furthermore, it is preferable that a functional part (e.g., opening insertion part 30b) is formed in the main body 30A of the case 30, and by attaching a strap or the like to this part and connecting it to clothing or the like, it is possible to prevent it from being lost when in use.

[0024] Next, the operation and effect of the sharpener 1 having the above-described configuration will be described. The sharpener 1 described above is equipped with whetstones 3 and 4 of different grit sizes, so one sharpener can be used for different purposes, such as rough grinding or fine grinding, depending on the type and part of the fishhook, eliminating the need to carry multiple sharpeners and improving convenience. Furthermore, although the whetstones 3 and 4 (whetstone body 2) made of ceramic are prone to breaking when dropped or hit, they are housed in a case 30, so are protected during transport and use.

[0025] The sharpener 1 of this embodiment is protected by the case 30, and the grinding stone body 2 is housed through openings 32a, 32b of the main body 30A and can be pulled out through the cutout 30a, improving operability. In addition, since the shape of the grinding stone body 2 is configured to be similar to that of the main body 30A, the grinding stone body 2 can be made the minimum size necessary so as not to interfere with the case 30.

[0026] Furthermore, since the groove 5 of the grindstone 3 is exposed from the opening 32a of the case 30 and the groove 6 of the grindstone 4 is exposed from the opening 32b, it is possible to sharpen the curved portion of the fishing hook while the grindstone body 2 is housed in the case.

[0027] Furthermore, since the grooves 5, 6 of the sharpener of this embodiment are formed on a different surface from the grinding surfaces 3A, 4A, the needle tip is prevented from getting caught in the grooves 5, 6 when sharpening over a wide surface, and powder generated during sharpening is less likely to get into the grooves. In addition, since the grooves 5, 6 of the sharpener of this embodiment are formed on a different surface from the grinding surfaces 3A, 4A, it is easy to see what is in front of you and to guide the needle tip into the grooves, even when sharpening a fishhook with multiple points or an extremely small fishhook, making sharpening easy.

[0028] In this embodiment, as described above, the inner surfaces 3ba, 4ba on the shorter sides of the grinding wheels 3, 4 are not joined to the inner surfaces 3aa, 4aa on the longer sides at an angle of 90° or less, but are joined at an obtuse angle by the tapers 3T, 4T. This makes it possible to efficiently reduce the thickness of the grinding surfaces 3A, 4A and thereby achieve weight reduction, while also ensuring the minimum necessary height on the shorter sides of each grinding wheel (guaranteed by the portions thickened by the tapers), thereby efficiently improving the strength of the portions where the grooves 5, 6 are formed.

[0029] That is, if the grinding wheels 3 and 4 were made of ceramic, they could break due to a momentary impact, but as described above, by joining the two grinding wheels at an obtuse angle, it is possible to more easily avoid cracking, breakage, etc.

[0030] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. As described above, the grinding wheels 3 and 4 of this embodiment have tapered joining surfaces, but as shown in Fig. 7(a), the inner surfaces 3aa and 4aa of each grinding wheel may be joined with flat surfaces. Alternatively, as shown in Fig. 7(b), the inner surfaces 3aa and 4aa of each grinding wheel may be joined with stepped surfaces, or as shown in Fig. 7(c), they may be joined with mountain-like irregularities. In other words, by increasing the joining area, it is possible to improve the joining strength, and the shape of the opposing joining surfaces can be modified as appropriate.

[0031] Furthermore, the grooves 5 and 6 can be appropriately modified to have a V-shaped cross section as shown in FIG. 8(a), a U-shaped cross section as shown in FIG. 8(b), a trapezoidal cross section as shown in FIG. 8(c), an acute-angled (triangular) cross section as shown in FIG. 8(d), or even a recessed shape of any other shape. Furthermore, the material of which the grindstone is made is not limited to ceramic, and may be metal such as steel, stone, diamond, or the like. [Explanation of symbols]

[0032] 1 sharpener 2 Grindstone body 3,4 Whetstone 3a,4a Longitudinal surface 3b,4b short side 5,6 groove 30 cases

Claims

1. The grinding stone has a large grain size and is formed in a substantially L-shaped cross section having a long side and a short side, and a grinding stone having a relatively small grain size and formed in the same manner, The sharpener is formed by joining the high-grain grindstone and the low-grain grindstone so that their joining surfaces face each other, and by providing grooves on the outer side of the short side of each grindstone.

2. 2. The sharpener according to claim 1, wherein the joint surfaces of the high-grain grindstone and the low-grain grindstone are each tapered.

3. The joined high-grain grinding stone and low-grain grinding stone are housed in a case so as to be rotatable 360° around an axis of an end of the grinding stone, 2. The sharpener according to claim 1, wherein the case has a shape that exposes the grooves formed in each of the joined high-grain grindstone and low-grain grindstone when the case houses the joined high-grain grindstone and low-grain grindstone.

4. 4. The sharpener according to claim 3, wherein the case is formed with a notch through which parts of the joined high-grain grindstone and low-grain grindstone can be pushed or pulled when the joined high-grain grindstone and low-grain grindstone are housed therein.

5. 2. The sharpener according to claim 1, wherein the grinding surfaces of the high-grain grindstone and the low-grain grindstone are formed flat.

6. 6. The sharpener according to claim 1, wherein the high-grain grindstone and the low-grain grindstone are made of ceramic.

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