JP2025080400A - Knife sharpener - Google Patents

Abstract

To provide a cutter sharpener for polishing the cutting edge of a blade such that the cutter sharpener can be used stably.SOLUTION: A cutter sharpener comprises a body and a first polishing body, which is disposed in the body and polishes a first blade that is a first type of a blade. The body has, in the bottom surface, a bottom surface recess formed to be recessed toward the upper surface side in a width direction at a center part in a longitudinal direction. The cross section perpendicular to the longitudinal direction in the center part in the longitudinal direction of the body has a U-shape protruding downward. A first slit is formed in a groove shape in the width direction in the upper surface of the body, where the first slit guides a blade edge toward the first polishing body.SELECTED DRAWING: Figure 1

Description

One aspect of the present invention relates to a knife sharpener that sharpens the cutting edge of a knife.

Conventionally, there has been an electric grinding wheel, as described in Patent Document 1, which includes a motor, a grinding wheel fixed to the motor shaft, and a spring. On the other hand, there has been a blade sharpening tool, as described in Patent Document 2, which does not have a motor, and which includes a support for supporting the grinding body, a base, and an elastic member and a guide member positioned between the support and the base.

Japanese Utility Model Publication No. 48-73893 JP 2018-122382 A

In recent years, the 3Rs have been proposed, which are the three Rs: Reduce, which uses things carefully and reduces waste; Reuse, which reuses usable items; and Recycle, which reuses waste as a resource. As mentioned above, the blade cartridges of conventional razors were often made of resin and metal, but there is a demand for replacing them with materials that are easier to recycle. In addition, Goal 12 of the 17 Sustainable Development Goals (SDGs) adopted at the United Nations Summit lists the securing of sustainable production and consumption patterns as "responsible consumption and production," and calls for a significant reduction in waste generation. For example, Goal 12-5 lists the goal of significantly reducing waste generation by preventing, reducing, recycling, and reusing waste by 2030. Under these circumstances, there is a demand for reducing waste generation in the field of knives and other blades.

On the other hand, knife sharpeners (knife sharpeners) for sharpening knives have not yet become widespread in ordinary households. The reasons why knife sharpeners are not widespread in ordinary households include the impression that they are difficult to use easily and safely, and the difficulty in finding storage space. Furthermore, conventional relatively compact knife sharpeners are not easy to install stably so as not to shift position, and the main body may move during use. Furthermore, there are few that are capable of sharpening multiple types of knives. The present invention aims to solve at least one of these problems, while popularizing knife sharpeners in ordinary households, allowing knives to be used comfortably for long periods of time, thereby reducing waste generation, etc.

The present invention provides a knife sharpener having the following configuration, for example:

One aspect of the present invention is a device comprising:
A blade sharpener comprising: a first sharpening body disposed within the body for sharpening a first blade, the first blade being a first type of blade;
The main body has a bottom surface recess formed in a longitudinal center portion thereof so as to be recessed toward an upper surface side across a width direction,
A cross section of the main body perpendicular to the longitudinal direction at the central portion in the longitudinal direction has a downwardly convex U-shape,
A first slit is formed on the upper surface of the main body, the first slit being formed in a groove shape extending in the width direction and guiding the cutting edge toward the first grinding body.
It is a knife sharpener.

According to the above-mentioned knife sharpener, the bottom recess is provided to improve gripping properties, and the user can hold the knife sharpener stably without it being displaced. Therefore, the knife sharpener can be prevented from moving in the direction in which the knife is slid during use, and can be used safely. In the conventional configuration, a guard member is provided between the gripping part held by the user and the slit into which the blade tip is inserted to prevent the hand from slipping toward the slit, but this configuration can be used safely without providing such a guard member. Since the above-mentioned knife sharpener does not require such a guard member, the size in the height direction can be reduced, and it can be stored compactly. In addition, the force applied by the user to the blade is effectively applied to the blade tip, so the blade to be sharpened can be sharpened with a relatively light force.

In the above-mentioned blade sharpener, preferably, a second sharpening body for sharpening a second blade of a different type from the first blade is further disposed in the main body,
A second slit is further formed on the upper surface of the main body, the second slit being formed in a groove shape extending in the width direction and guiding the cutting edge toward the second grinding body;
The first slit and the first polishing body are arranged on one side of the main body in the longitudinal direction relative to the central portion, and the second slit and the second polishing body are arranged on the other side of the main body in the longitudinal direction relative to the central portion.

According to the above-mentioned knife sharpener, the first slit and first grinding body, and the second slit and second grinding body are arranged on one side and the other side of the center in a well-balanced manner, so that each grinding body can sharpen different types of blades, while still allowing for a compact configuration. In addition, because the center of gravity can be positioned near the center, it is less likely to become displaced, making it more stable when in use.

In the above-mentioned blade sharpener, preferably, the first blade is a blade with a wavy cutting edge, and the second blade is a blade with a straight or curved cutting edge.

When sharpening blades with wavy edges, the blade sharpener is particularly prone to misalignment, but the above-mentioned blade sharpener can stabilize the position during use. Also, in recent years, high-quality bread has become more widely distributed than before, and as a result, wavy-edged knives with wavy edges are being used more frequently. We can provide a blade sharpener that can sharpen both such wavy-edged knives and blades with straight or curved edges.

In the above-mentioned blade sharpener, preferably, a third sharpening body for sharpening the second blade is further disposed within the main body,
A third slit is further formed on the upper surface of the main body, the third slit being formed in a groove shape extending in the width direction and guiding the cutting edge toward the third grinding body;
The third slit and the third polishing body are disposed on the other side in the longitudinal direction of the main body with respect to the central portion.

The above-mentioned blade sharpener is configured to include a second sharpening body and a third sharpening body as sharpening bodies for sharpening a second blade having a straight or curved cutting edge, so that it can be configured to effectively sharpen a second blade that is used more frequently. In addition, the second slit, the second sharpening body, the third slit, and the third sharpening body for sharpening the second blade are configured to be adjacent to the other side of the center portion, so that it is easy to sharpen the second blade.

In the above knife sharpener, the main body is preferably a substantially rectangular parallelepiped.

The above knife sharpener can be made more compact, making it easier to store, for example, in a kitchen drawer.

In the above-mentioned knife sharpener, the bottom recess is preferably formed symmetrically with respect to the center of the body in the width direction.

When the above-mentioned blade sharpener is configured so that the first and second sharpening bodies are arranged on one side and the other side of the center in the longitudinal direction, respectively, the main body can be easily gripped by placing the fingers on the bottom recess regardless of which sharpening body is being used. In addition, the main body can be easily gripped regardless of the dominant hand.

One aspect of the present invention is a device comprising:
A blade sharpener comprising: an abrasive body disposed within the body,
The main body has a bottom surface recess formed in a longitudinal center portion thereof so as to be recessed toward an upper surface side across a width direction,
A cross section of the main body perpendicular to the longitudinal direction at the central portion in the longitudinal direction has a downwardly convex U-shape,
A slit is formed on the upper surface of the main body in a groove shape extending in the width direction to guide the cutting edge toward the grinding body,
The upper surface of the main body is not provided with any member protruding upward.
It is a knife sharpener.

According to the above-mentioned knife sharpener, the bottom recess is provided to improve gripping properties, and the user can hold the knife sharpener stably without it being displaced. Therefore, the knife sharpener can be prevented from moving in the direction in which the knife is slid during use, and can be used safely. In the conventional configuration, a guard member was provided between the gripping part held by the user and the slit into which the blade tip is inserted, protruding upward from the top surface of the main body to prevent the hand from slipping toward the slit, but this configuration can be used safely without providing such a guard member. Since the above-mentioned knife sharpener does not require such a guard member, the size in the height direction can be reduced, and it can be stored compactly. In addition, the force applied by the user to the blade is effectively applied to the blade tip, so the blade to be sharpened can be sharpened with a relatively light force.

One aspect of the present invention is a device comprising:
A knife sharpener comprising: a first sharpening body arranged in the main body for sharpening a first blade having a wavy cutting edge; a second sharpening body for sharpening a second blade having a straight or curved cutting edge; and a third sharpening body for sharpening the second blade,
the third abrasive body having a finer grain size than the second abrasive body;
The main body has a bottom surface recess formed in a central portion in a longitudinal direction of the main body so as to be recessed toward an upper surface side across a width direction,
The bottom surface recess is formed symmetrically with respect to a center in the width direction of the main body,
A cross section of the main body perpendicular to the longitudinal direction at the central portion in the longitudinal direction has a downwardly convex U-shape,
The upper surface of the main body is
a first slit formed in a groove shape extending in the width direction and guiding the cutting edge toward the first grinding body;
a second slit formed in a groove shape extending in the width direction and guiding the cutting edge toward the second grinding body;
a third slit formed in a groove shape extending in the width direction and guiding the cutting edge toward the third grinding body;
the first slit and the first polishing body are disposed on one side of the central portion in the longitudinal direction of the main body, and the second slit, the second polishing body, the third slit, and the third polishing body are disposed on the other side of the central portion in the longitudinal direction of the main body.
It is a knife sharpener.

In the above-mentioned blade sharpener, preferably, the first grinding body is composed of two plate-shaped grindstones,
the second abrasive body is a grindstone having a shape in which two truncated cones are connected to each other at their upper surfaces, each of which has an area smaller than that of its bottom surface;
The third abrasive body is composed of two cylindrical grinding stones.

FIG. 1 is a perspective view of a knife sharpener. FIG. 2 is a perspective view of the knife sharpener with the cover removed. FIG. 3 is a perspective view of the knife sharpener with the cover removed. FIG. 4 is a view of the cover as seen from the bottom side. FIG. 5 is a bottom view of the knife sharpener. FIG. 6 is a side view of the knife sharpener. FIG. 7 is a perspective view of a knife sharpener. FIG. 8 is a cross-sectional view of the knife sharpener taken along the line AA in FIG.

The blade sharpener of the present invention will be described in detail with reference to the drawings. However, the embodiment described below is merely one example of the present invention, and is not intended to limit the technical scope of the present invention. In each drawing, the same components are given the same reference numerals, and their description may be omitted. In this specification, the upper and lower sides in the vertical direction are referred to as the upper and lower sides, respectively, based on the state in which the blade sharpener 1 is placed during use, the lower surface is referred to as the bottom surface or lower surface, and the upper surface is referred to as the upper surface.

<Configuration of a knife sharpener>
As shown in Fig. 1 and Fig. 2, etc., the knife sharpener 1 includes a base 2 and a cover 3. The base 2 and the cover 3 are connected to form the main body 4 of the knife sharpener 1, and the main body 4 includes a plurality of sharpening bodies for sharpening the blade. As shown in Fig. 1, the main body 4 is a rounded, approximately rectangular parallelepiped, and a bottom recess 25 (described later) is formed on the bottom surface. The knife sharpener 1 can sharpen a wavy-edged knife, which is a blade with a wavy edge, and a double-edged knife, which is a blade with a straight or curved edge. In other words, the main body 4 is the housing (case) of the knife sharpener 1.

<Base 2>
The base 2 is a part of the main body 4 and constitutes the bottom of the blade sharpener 1. The base 2 supports the first abrasive body 21, the second abrasive body 22, and the third abrasive body 23, which are the respective components of the blade sharpener 1. That is, the first abrasive body 21, the second abrasive body 22, and the third abrasive body 23 are disposed inside the main body 4 which is constituted by the base 2 and the cover 3. The base 2 has two screw holes 24 which are through holes, and is connected to the cover 3 by a screw 24a inserted into the screw holes 24. A screw thread may be formed inside the screw hole 24, but the screw hole 24 may also be a through hole without a screw thread.

1 and 6, the base 2 has a bottom recess 25 formed on its bottom surface in the longitudinal center so as to be recessed toward the upper surface side across the width direction. The bottom recess 25 has a seamless curved surface configuration. In other words, the bottom recess 25 is formed in a gently curved shape with rounded corners. FIG. 8 is a cross-sectional view of the blade sharpener 1 at the position A-A in FIG. 6. That is, FIG. 8 is a cross-sectional view of the blade sharpener 1 in a plane perpendicular to the longitudinal direction at the longitudinal center. As shown in FIG. 8, in the cross section perpendicular to the longitudinal direction of the base 2, the central portion of the base 2 has a U-shape that is convex downward. The bottom recess 25 is formed symmetrically with respect to the center in the width direction of the base 2. The bottom recess 25 is formed so that when the user holds the body 4 of the knife sharpener 1 from above during use, the user's fingers can rest on it, allowing the user to hold the knife sharpener 1 stably.

As shown in FIG. 3, the base 2 is rectangular in plan view from above. The base 2 has a first abrasive body 21 on one side relative to the longitudinal center of the blade sharpener 1, and a second abrasive body 22 and a third abrasive body 23 on the other side. These abrasive bodies are arranged from one side of the blade sharpener 1 in the order of the first abrasive body 21, the third abrasive body 23, and the second abrasive body 22.

As shown in Figures 5 and 7, a U-shaped hook 26 is provided on the bottom surface of the base 2. The hook 26 is rotatably connected to the bottom surface of the base 2 at two connecting parts 26a. By rotating the hook 26 around the connecting parts 26a as a rotation axis, the hook 26 can be changed from the stored state shown in Figure 5 to the deployed state shown in Figure 7. In the deployed state of Figure 7, the hook 26 can be stored by hanging it on a hook or the like provided on the wall of the kitchen.

<First polishing body 21, second polishing body 22, third polishing body 23>
The first grinding body 21 is disposed below the first slit 31 as shown in Fig. 2 and Fig. 3. The first grinding body 21 is a grinding stone for grinding a serrated blade knife, and is composed of two plate-shaped grinding stones, the first grinding stone 21a. The first grinding stone 21a is formed of, for example, a cemented carbide alloy. The end faces of the first grinding stone 21a come into contact with the cutting edge of the serrated blade knife, and the serrated blade knife can be ground. The first grinding body 21 is supported by being clamped at its bottom and sides by the base 2.

The second grinding body 22 is disposed below the second slit 32 as shown in Figs. 2 and 3. The second grinding body 22 is a grinding stone for initially grinding a double-edged knife, and is made of the second grinding stone 22a, which is a grinding stone in the shape of two truncated cones, each of which has an area smaller than the bottom surface and is connected to each other at its top surface. The second grinding stone 22a is formed, for example, from ceramic. The side surface of the second grinding stone 22a abuts against the cutting edge of the double-edged knife, and the double-edged knife can be sharpened. The second grinding body 22 has a central axis 22b that passes through the center, and this central axis is supported by the base 2.

The third grinding body 23 is disposed below the third slit 33 as shown in Figs. 2 and 3. The third grinding body 23 is a whetstone for finishing the double-edged knife that has been ground by the second grinding body 22, and is a whetstone with a finer grain size than the second grinding body 22. The third grinding body 23 is made of two cylindrical whetstones, the third grinding stone 23a. The third grinding stone 23a is formed, for example, from ceramic. The side of the third grinding stone 23a abuts against the cutting edge of the double-edged knife, and can grind the double-edged knife. The side and bottom end of the third grinding stone 23a are supported by the base 2.

<Cover 3>
The cover 3 is a part of the main body 4 and constitutes the upper part of the blade sharpener 1. As shown in Figs. 1 and 2, a first slit 31, a second slit 32, and a third slit 33 are formed on the upper surface of the cover 3. The first slit 31, the second slit 32, and the third slit 33 are each formed in a groove shape extending from the upper surface of the cover 3 downward across the width direction of the cover 3. The first slit 31, the second slit 32, and the third slit 33 are each formed in a straight line along the vertical direction. The first grinding body 21, the second grinding body 22, and the third grinding body 23, each supported by the base 2, are disposed below the first slit 31, the second slit 32, and the third slit 33. The first slit 31 is located on one side of the center of the blade sharpener 1 in the longitudinal direction, and the second slit 32 and the third slit 33 are located on the other side. These slits are formed in the order of first slit 31, third slit 33, and second slit 32 from one side of the blade sharpener 1. The first slit 31, second slit 32, and third slit 33 guide the cutting edge of the blade to be sharpened toward the first abrasive body 21, the second abrasive body 22, and the third abrasive body 23, respectively.

The side surfaces 3a on both sides of the cover 3 are formed with curved recesses 3b that curve upward along the bottom recess 25.

The cover 3 has two screw holes 34 into which the screws 24a inserted through the screw holes 24 in the base 2 are inserted. The screw holes 34 are female threads with internal threads.

As shown in FIG. 6, icons 31a, 32a, and 33a are provided on the side 3a of the cover 3 adjacent to the first slit 31, the second slit 32, and the third slit 33, respectively, as usage guides. The icons 31a, 32a, and 33a display the type of blade to be sharpened in the adjacent first slit 31, the second slit 32, and the third slit 33, respectively, and an indication of the number of times the blade to be sharpened should be slid when sharpening. The icons 31a to 33a are provided not only on one side 3a of the cover 3 shown in FIG. 6, but also on the side opposite this side 3a. Providing the icons 31a to 33a on both sides makes the icons 31a to 33a easier to see, regardless of the user's dominant hand.

<Size of knife sharpener 1>
6 and 1, the length L1 in the longitudinal direction of the main body 4 of the blade sharpener 1 is 135 mm, the length L2 in the width direction is 36 mm, and the length in the vertical direction, i.e., the height L3 is 40 mm. The length L4 in the longitudinal direction of the bottom recess 25 is 74 mm, and the length in the vertical direction, i.e., the height L5 is 28 mm. The height L6 at the position where the height is lowest in the center in the width direction of the bottom recess 25 is 13 mm.

This size improves grip, and when a user grasps the main body 4, the user's fingers can wrap around the bottom recess 25 to some extent, making the main body 4 less likely to tip over and making it easier to apply force from above when using it. In addition, because the bottom recess 25 has a curved shape, the user can hold the main body 4 with a good feel.

<Using the knife sharpener 1>
As described above, the knife sharpener 1 can be used to sharpen a serrated knife and a double-edged knife. When sharpening a serrated knife, the user can recognize that the first slit 31 and the first grinding body 21 are for sharpening a serrated knife by looking at the icons 31a to 33a (especially the icon 31a). The user inserts the edge of the serrated knife to be sharpened through the first slit 31, and contacts the edge with the first grinding body 21 while being guided by the first slit 31. The user then sharpens the edge of the serrated knife by sliding the serrated knife toward himself. The user can repeat this sharpening operation for the number of times indicated by the guide of the icon 31a. In this manner, the serrated knife can be sharpened using the knife sharpener 1.

On the other hand, when sharpening a double-edged knife, the user can recognize by looking at the icons 31a to 33a (especially icons 32a and 33a) that the double-edged knife should first be sharpened with the second slit 32 and the second sharpening body 22, and then with the third slit 33 and the third sharpening body 23. The user first inserts the edge of the double-edged knife to be sharpened through the second slit 32, and abuts the edge against the second sharpening body 22 while being guided by the second slit 32. The user then sharpens the edge of the double-edged knife by sliding it toward himself. The user can repeat the sharpening operation with the second sharpening body 22 for the number of times indicated by the guide of the icon 32a. The user then inserts the edge of the double-edged knife to be sharpened through the third slit 33, and sharpens the edge with the third sharpening body 23 in the same manner. The user can repeat the sharpening operation with the third sharpener 23 for the number of times indicated by the guide of the icon 33a. In this way, the double-edged knife can be sharpened using the blade sharpener 1.

<Modification>
The blade sharpener of the above embodiment may employ the following modified examples. Note that the modified examples described below should not be interpreted as limiting the present invention, but are described as specific examples.

In the embodiment, a serrated blade knife and a double-edged blade knife are the blades to be sharpened, but for example, a serrated blade knife and a single-edged blade knife may be sharpened, or a double-edged blade knife and a single-edged blade knife may be sharpened. In this case, a sharpening body suitable for the blade to be sharpened is used. However, it is preferable to configure the embodiment so that a double-edged blade knife and a serrated blade knife, which are often used in ordinary households, are sharpened.

The abrasives used in the knife sharpener 1 of the embodiment are not limited to the first abrasive 21, the second abrasive 22, and the third abrasive 23 described in the embodiment, and can be changed as appropriate. In addition, in the configuration of the embodiment, the first abrasive 21 is used as one abrasive for the serrated blade knife, and the second abrasive 22 and the third abrasive 23 are used as two abrasives for the double-edged knife, but the configuration is not limited to this. In other words, the serrated blade knife may be configured to use two or more abrasives, and the double-edged knife may be configured to use one or three or more abrasives. However, it is preferable to use the configuration of the embodiment in which the abrasives are arranged in a balanced manner.

The blade sharpener 1 of the embodiment does not employ a configuration in which the grinding body is rotated using a motor or the like, but the grinding body may be rotated using a motor or the like. In this case, only one of the grinding bodies may be rotated, or all of the grinding bodies may be rotated.

<Features of the embodiment>
The knife sharpener of one embodiment described above by way of example and modified examples has the following features.

The knife sharpener 1 comprises a main body 4 including a base 2 and a cover 3, and a first sharpening body 21 arranged within the main body 4 for sharpening a first blade (e.g., a serrated knife), which is a first type of blade. The main body 4 has a bottom recess 25 formed in the center of the longitudinal direction on the bottom surface so as to be recessed toward the upper surface side across the width direction. The cross section of the main body 4 at the center of the longitudinal direction, perpendicular to the longitudinal direction (see FIG. 8), is U-shaped with a convex downwards. The top surface of the main body 4 has a first slit 31 formed as a groove across the width direction to guide the cutting edge toward the first sharpening body 21.

According to such a blade sharpener 1, the configuration with the bottom recess 25 improves gripping properties, and the user can hold the blade sharpener 1 stably without shifting position. Therefore, the blade sharpener 1 can be prevented from moving in the direction in which the blade is slid during use, and can be used safely. In the conventional configuration, a guard member was provided between the gripping part held by the user and the slit into which the blade tip is inserted to prevent the hand from slipping toward the slit, but this configuration can be used safely without providing such a guard member. Since the blade sharpener 1 does not require such a guard member, the size in the height direction can be reduced, making it easier to store compactly. In addition, the force applied by the user to the blade is effectively applied to the blade tip, so the blade to be sharpened can be sharpened with a relatively light force.

In addition, in the above-mentioned blade sharpener 1, it is preferable to configure the upper surface of the main body 4 (the upper surface of the cover 3) so that there are no parts that protrude upward.

The knife sharpener 1 further includes a second sharpening body 22 disposed within the main body 4 for sharpening a second blade (e.g., a double-edged knife) of a different type from the first blade (e.g., a serrated knife). A second slit 32 is further formed on the top surface of the main body 4, and is grooved across the width to guide the blade tip toward the second sharpening body 22. The first slit 31 and the first sharpening body 21 are disposed on one side of the main body 4 in the longitudinal direction relative to the center of the main body 4, and the second slit 32 and the second sharpening body 22 are disposed on the other side of the center of the main body 4 in the longitudinal direction.

With this type of blade sharpener 1, the first slit 31 and first grinding body 21, and the second slit 32 and second grinding body 22 are arranged on one side and the other side of the center in a well-balanced manner, allowing each grinding body to sharpen different types of blades while still allowing for a compact configuration. In addition, since the center of gravity can be positioned near the center, it is less likely to become displaced, making it more stable when in use.

The knife sharpener 1 is also configured to sharpen a serrated knife with a wavy cutting edge as the first knife, and sharpen a straight or curved cutting edge (e.g., a double-edged knife) as the second knife.

When sharpening blades with wavy edges, the blade sharpener is particularly prone to misalignment, but the above-mentioned blade sharpener 1 can stabilize the position during use. Also, in recent years, high-quality bread has become more widely distributed than before, and as a result, wavy-edged knives with wavy edges are being used more frequently. We can provide a blade sharpener that can sharpen both such wavy-edged knives and blades with straight or curved edges.

The blade sharpener 1 further includes a third grinding body 23 arranged within the main body 4 for grinding a second blade (e.g., a double-edged knife). A third slit 33 is further formed in the upper surface of the main body 4, and is grooved across the width to guide the blade tip toward the third grinding body 23. The third slit 33 and the third grinding body 23 are arranged on the other side of the main body 4 in the longitudinal direction relative to the longitudinal center of the main body 4.

The blade sharpener 1 is configured to include the second sharpening body 22 and the third sharpening body 23 as sharpening bodies for sharpening a second blade (e.g., a double-edged knife) with a straight or curved cutting edge, so that it can be configured to effectively sharpen a second blade that is used more frequently. In addition, the second slit 32, the second sharpening body 22, the third slit 33, and the third sharpening body 23 for sharpening the second blade are arranged adjacent to the other side of the center, so that it is configured to easily sharpen the second blade.

In addition, because the main body 4 of the knife sharpener 1 is a roughly rectangular parallelepiped, it can be made more compact and can be easily stored, for example, in a kitchen drawer.

In addition, in the blade sharpener 1, the bottom recess 25 is formed symmetrically with respect to the center in the width direction of the main body 4. The blade sharpener 1 is configured such that the first abrasive body 21 is disposed on one side of the center in the longitudinal direction, and the second abrasive body 22 and the third abrasive body 23 are disposed on the other side, so that the user may grip one side to use the second abrasive body 22 and the third abrasive body 23, or grip the other side to use the first abrasive body 21. In this case, as described above, the bottom recess 25 is formed so as to be symmetrical with respect to the center in the width direction of the main body 4, so that the user can easily grip the main body 4 by hooking a finger on the bottom recess 25 in either case. In addition, the configuration makes it easy to grip the main body 4 regardless of the dominant hand.

As shown in the embodiment, the blade sharpener 1 can be configured to include a main body 4, a first grinding body 21 arranged in the main body 4 for grinding a first blade having a wavy cutting edge, a second grinding body 22 for grinding a second blade having a straight or curved cutting edge, and a third grinding body 23 for grinding the second blade. Here, the third grinding body 23 has a finer grain size than the second grinding body 22. The main body 4 has a bottom surface recess 25 formed in the center of the longitudinal direction of the main body 4 so as to be recessed toward the upper surface side across the width direction. The cross section of the main body 4 perpendicular to the longitudinal direction at the center of the longitudinal direction (see FIG. 8) is U-shaped with a convex downward. The upper surface of the main body 4 has a first slit 31, a second slit 32, and a third slit 33. The first slit 31 is formed in a groove shape across the width direction and guides the cutting edge toward the first grinding body 21. The second slit 32 is formed as a groove extending in the width direction and guides the cutting edge toward the second abrasive body 22. The third slit 33 is formed as a groove extending in the width direction and guides the cutting edge toward the third abrasive body 23. The first slit 31 and the first abrasive body 21 are disposed on one side of the longitudinal center of the main body 4, and the second slit 32, the second abrasive body 22, the third slit 33, and the third abrasive body 23 are disposed on the other side of the longitudinal center of the main body 4.

In addition, in the above, the first polishing body 21 can be composed of two plate-shaped first grinding stones 21a, the second polishing body 22 can be composed of a second grinding stone 22a having a shape of two truncated cones connected to each other at their top surfaces, each of which has an area smaller than that of the bottom surface, and the third polishing body 23 can be composed of two cylindrical third grinding stones 23a.

The knife sharpener 1 is compact with the above-mentioned configuration and size, and can be stored in a convenient place such as a kitchen drawer, making it easy to resharpen knives, so that knives can always be used with sharp edges. It can also be stored in a kitchen drawer, helping to keep the kitchen tidy. Furthermore, despite its compact size, the knife sharpener 1 can be held firmly and stably to sharpen knives and the like. Furthermore, the knife sharpener 1 can sharpen multiple types of blades while maintaining a compact configuration.

1... knife sharpener 2... base 21... first grinding body 22... second grinding body 23... third grinding body 24... screw hole 24a... screw 25... bottom recess 26... hook 3... cover 31... first slit 32... second slit 33... third slit 31a to 33a... icon 34... screw hole 4... main body

Claims (9)

The main body,
A blade sharpener comprising: an abrasive body disposed within the body,
The main body has a bottom surface recess formed in a longitudinal center portion thereof so as to be recessed toward an upper surface side across a width direction,
A cross section of the main body perpendicular to the longitudinal direction at the central portion in the longitudinal direction has a downwardly convex U-shape,
A slit is formed on the upper surface of the main body in a groove shape extending in the width direction to guide the cutting edge toward the grinding body.
Knife sharpener. The grinding body is a first grinding body for grinding a first blade,
The slit is a first slit,
A second sharpening body for sharpening a second blade of a different type from the first blade is further disposed in the main body;
A second slit is further formed on the upper surface of the main body, the second slit being formed in a groove shape extending in the width direction and guiding the cutting edge toward the second grinding body;
the first slit and the first polishing body are disposed on one side of the central portion in the longitudinal direction of the main body, and the second slit and the second polishing body are disposed on the other side of the central portion in the longitudinal direction of the main body.
2. The knife sharpener according to claim 1. The first blade is a blade having a wavy cutting edge, and the second blade is a blade having a straight or curved cutting edge.
3. The knife sharpener according to claim 2. A third grinding body for grinding the second blade is further disposed in the main body,
A third slit is further formed on the upper surface of the main body, the third slit being formed in a groove shape extending in the width direction and guiding the cutting edge toward the third grinding body;
the third slit and the third polishing body are disposed on the other side in the longitudinal direction of the main body with respect to the central portion.
3. The knife sharpener according to claim 2. The main body is a substantially rectangular parallelepiped.
3. The knife sharpener according to claim 2. The bottom surface recess is formed symmetrically with respect to the center in the width direction of the main body.
3. The knife sharpener according to claim 2. The main body,
A blade sharpener comprising: an abrasive body disposed within the body,
The main body has a bottom surface recess formed in a longitudinal center portion thereof so as to be recessed toward an upper surface side across a width direction,
A cross section of the main body perpendicular to the longitudinal direction at the central portion in the longitudinal direction has a downwardly convex U-shape,
A slit is formed on the upper surface of the main body in a groove shape extending in the width direction to guide the cutting edge toward the grinding body,
The upper surface of the main body is not provided with any member protruding upward.
Knife sharpener. The main body,
A knife sharpener comprising: a first sharpening body arranged in the main body for sharpening a first blade having a wavy cutting edge; a second sharpening body for sharpening a second blade having a straight or curved cutting edge; and a third sharpening body for sharpening the second blade,
the third abrasive body having a finer grain size than the second abrasive body;
The main body has a bottom surface recess formed in a central portion in a longitudinal direction of the main body so as to be recessed toward an upper surface side across a width direction,
The bottom surface recess is formed symmetrically with respect to a center in the width direction of the main body,
A cross section of the main body perpendicular to the longitudinal direction at the central portion in the longitudinal direction has a downwardly convex U-shape,
The upper surface of the main body is
a first slit formed in a groove shape extending in the width direction and guiding the cutting edge toward the first grinding body;
a second slit formed in a groove shape extending in the width direction and guiding the cutting edge toward the second grinding body;
a third slit formed in a groove shape extending in the width direction and guiding the cutting edge toward the third grinding body;
the first slit and the first polishing body are disposed on one side of the central portion in the longitudinal direction of the main body, and the second slit, the second polishing body, the third slit, and the third polishing body are disposed on the other side of the central portion in the longitudinal direction of the main body.
Knife sharpener. The first abrasive body is composed of two plate-shaped grindstones,
the second abrasive body is a grindstone having a shape in which two truncated cones are connected to each other at their upper surfaces, each of which has an area smaller than that of its bottom surface;
The third abrasive body is composed of two cylindrical grinding stones.
9. The knife sharpener according to claim 8.

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