JP6639213B2 - Manual sharpener - Google Patents

Description

  The present invention relates to a sharpener that is mainly used in ordinary households and that can be applied to a blade having a wavy blade.

  Sharpeners have already been proposed in which the grindstone is supported by a coil spring and moves by the elasticity of the coil spring during polishing of the blade. For example, in the sharpener of Patent Literature 1, a V-shaped sharpening groove is formed by two opposed grindstones, and the blade is inserted into the V-shaped sharpening groove with the cutting edge of the blade facing downward and polished. Then, one of the grindstones is urged from the back surface thereof to the opposed grindstone side by a coil spring. Therefore, one of the grindstones is elastically movable in the lateral direction.

  On the other hand, in the sharpener of Patent Literature 2, a plurality of grindstones are arranged, and each grindstone is supported by a coil spring attached below the grindstones, and is movable in a vertical direction. However, the sharpening surface of this whetstone faces upward, and during polishing, the blade is laid down and only one surface of the blade tip is polished. That is, unlike Patent Literature 1, at the time of polishing, the blade is not polished with the cutting edge of the blade facing downward, and neither of the two surfaces of the blade tip portion is polished at the same time. If the sharpener of Patent Literature 2 is to be polished with the cutting edge of the blade facing downward, the sharpener must be used with the sharpening surface directed sideways. In that case, since each grindstone moves elastically in the lateral direction, in the case of polishing with the cutting edge of the cutting tool facing down, the sharpeners of Patent Documents 1 and 2 disclose the direction of the cutting edge and the moving direction of the grinding stone. Are substantially the same.

  Further, in the sharpener of Patent Document 3, a spherical grindstone is used as a grindstone, and these grindstones are each supported by a spring body and are movable. The moving direction is the horizontal direction as in Patent Documents 1 and 2. is there. As described above, in the sharpeners of Patent Literatures 1 to 3, all the grindstones are movable, but when polishing with the cutting edge of the blade facing downward, the moving direction of the grindstones is not a horizontal direction but a vertical direction. It is.

  As described above, the present invention is a sharpener that can be applied to a blade having a wavy blade. The corrugated blade is a blade having a waveform in which a blade edge of an arc-shaped convex blade and a blade edge of an arc-shaped concave blade alternately continue. Here, the cutting edge portion means that the cutting edge that forms the wave blade extends in a wavy manner at the lower edge of the blade, and along the cutting edge, an inclined surface for forming a sharp cutting edge extends, It refers to the part including the surface and the cutting edge. In many cases, the blade of the wave blade has an inclined surface formed only on one surface of the cutting edge portion, and the other surface of the cutting edge portion has a flat surface without any inclined surface. Such a blade having an inclined surface formed only on one surface of the blade tip portion is generally called a single blade. A knife is a typical single-edged knife.

  In general, when polishing not only the corrugated blade but also the blade of the blade, the inclined surface of the blade edge portion is polished to sharpen the blade edge. Since the linear blade of the blade with no unevenness on the cutting edge has no unevenness on the inclined surface, the frictional force between the cutting edge and the grindstone generated with the movement of the cutting edge during polishing is almost constant during the movement, Polishing can be performed smoothly. On the other hand, the wave blade has irregularities on the cutting edge, and irregularities are also formed on the inclined surface of the cutting edge. As described below, the unevenness of the inclined surface may hinder smooth polishing.

  When polishing a corrugated blade, it is preferable to use a small grindstone body to adapt to the unevenness of the blade edge. The sharpening device of Patent Document 3 is a device in which the small whetstone bodies are opposed to each other so as to be elastically movable in the lateral direction to form a sharpening device. The sharpener of Patent Literature 3 does not describe sharpening of a wave blade, but can sharpen a wave blade as compared with the sharpener of Patent Literature 1 which is completely unsuitable for polishing a wave blade. When the wave blade is polished with the sharpener described in Patent Document 3, the grinding stone body hits the convex surface of the uneven surface formed on the inclined surface of the cutting edge, and tries to spread the grinding stone body on both sides to the left and right. . That is, the grindstone body attempts to respond to the vertical change of the wave blade by the lateral movement. Therefore, when the grindstone body comes into contact with the convex surface of the inclined surface of the blade edge portion, a large frictional force is generated between the convex surface and the grindstone body, which may hinder smooth polishing. Further, as described above, the blade of the wave blade is often a single blade, and an inclined surface is formed only on one surface of the blade edge portion, and an uneven surface is formed on the inclined surface. Therefore, when the thickness of the blade is the same, the degree of protrusion of the convex surface is doubled as compared with the case where the concave and convex surfaces are formed on both sides of the blade edge portion. It becomes.

Japanese Utility Model Publication No. 60-4343 JP 2002-530214 A Japanese Patent No. 4346516

  An object of the present invention is to provide a manual sharpener that is applicable to a blade whose blade is a corrugated blade, and reduces the frictional force that the corrugated blade receives from a grindstone body when the corrugated blade is polished, thereby enabling smooth polishing. I do.

The invention according to claim 1 is a manual sharpener that simultaneously grinds both surfaces of a blade with a plurality of grindstones while moving the blade back and forth with its cutting edge downward, and grinds at least one surface of the blade. The grindstone body is attached to the sharpener so as to be elastically movable in the vertical direction, and the movable grindstone body is supported by each individual support member, and each support member is independently moved vertically. It is supported by an elastic member so that it can be elastically moved in the direction, and each whetstone body is configured to move up and down together with a supporting member that supports it .

The invention according to claim 2 is a configuration in which there are a plurality of grinding stone bodies for polishing at least one surface of the blade, and the invention according to claim 3 has the same number of grinding stone bodies for polishing each surface of the blade. Thus, each of the grinding stone bodies is attached to the sharpener so as to be elastically movable in the vertical direction.

Invention of claim 4 wherein each support member has a recess for receiving the grinding wheel body, the sharpener, a configuration having a means for preventing deviation from the recess of the grinding bodies, according to claim In the invention described in Item 5 , each support member is mounted on both sides of the blade with the blade moving direction line as a center line, and the concave portion has a side opening facing the blade moving direction line and is supported by the concave portion. The whetstone body is configured to protrude from the side opening to the opposite supporting member side beyond the moving direction line of the blade.

The invention according to claim 6 is characterized in that an upper opening is formed on the upper surface of each support member, an upper opening is formed so that the grindstone body can pass through the upper opening and enter the recess, and the grindstone body is laterally formed. In this configuration, a side opening is formed so as to protrude from the opening but cannot pass through.

According to a seventh aspect of the present invention, the individual supporting members mounted on one side and the other side of the moving direction line of the blade are not entirely opposed to each other, and are halfway along the moving direction line of the blade. In this configuration, a part of the support member is in contact with the grindstone body supported by the opposed support member so as to prevent deviation from the side opening of the grindstone body.

The invention according to claim 1 is a sharpener for polishing while moving the blade back and forth with its cutting edge downward, wherein a grindstone body for polishing at least one surface of the blade is arranged vertically with respect to the sharpener. It is mounted movably elastically. As described above, the present invention is a sharpener that can be applied to a blade having a corrugated blade, and uses a relatively small grindstone for a movable grindstone so as to be applicable to polishing of a corrugated blade. I plan to do that. If the grindstone body is large, the sharpening surface of the grindstone body may not be able to polish the concave blade. The present invention is intended to cope with the polishing of the corrugated blade by such a vertical movement of the grindstone body, and has a different configuration from a conventional sharpener corresponding to the horizontal movement. When the blade is polished with the sharpener of the present invention, the grindstone body is automatically pushed down by the convex inclined surface when the grindstone body hits the convex surface of the uneven surface formed on the inclined surface of the cutting edge. Then, when the grindstone body is pushed down, the grindstone body moves to a portion near the cutting edge of the convex inclined surface, but since the thickness of the blade near the cutting edge of the inclined surface is formed thin, the convex The degree is small, and the whetstone body can easily get over the inclined surface of the thin part where the degree of convexity is small. Thereby, even if the grindstone body hits the convex inclined surface, no large frictional force is generated, so that smooth polishing can be performed.

Further, according to the first aspect of the present invention, the movable grindstone body is supported by each of the individual support members, and each of the support members is elastically movable so as to be elastically movable in a vertical direction independently. It is supported by a member. In the case of a configuration in which the grindstone body moves alone without using the support member, the surface of the grindstone body is not a smooth surface, so that the grindstone body comes into contact with the peripheral wall or the like during movement, and smooth movement is hindered. There is a fear. Therefore, if the support member is used, it is possible to move the grindstone body without making contact with the peripheral wall or the like. Moves smoothly, and accordingly, the grindstone body can move smoothly.

The invention according to claim 2 has a plurality of movable grindstone bodies for polishing at least one surface of the blade. Therefore, the blade can be efficiently polished by polishing the uneven surface formed on the inclined surface of the blade tip with the plurality of grindstone bodies. The invention according to claim 3 has the same number of grindstone bodies for polishing the respective surfaces of the blade, and each grindstone body can be elastically moved in the vertical direction with respect to the sharpener. Therefore, when the inclined surfaces are formed on both surfaces of the cutting edge portion, and the uneven surface is formed on each inclined surface, the blade can be efficiently polished. In addition, in the case of a single blade in which an uneven surface is formed only on one inclined surface, the grinding stone body also hits the other inclined surface, so that burrs of the cutting edge can be prevented from remaining on the other inclined surface.

According to a fourth aspect of the present invention, each support member has a concave portion for receiving the grindstone body, and the sharpener has a means for preventing a deviation of the grindstone body from the concave portion. Therefore, as compared with a configuration in which the grindstone body is simply placed on the upper surface of the support member, the whetstone body can be prevented from rattling during polishing by being accommodated in the concave portion. According to a fifth aspect of the present invention, each support member is mounted on both sides of the blade with the center line in the direction of movement of the blade, and the recess has a side opening facing the line of movement of the blade. The grindstone body supported on the side protrudes from the side opening toward the opposing support member beyond the moving direction line of the blade. Therefore, since the polishing surfaces of the grindstone bodies on both sides intersect, the cutting edge can be sharply polished.

The invention according to claim 6 is characterized in that an upper opening is formed on the upper surface of each support member, an upper opening is formed so that the grindstone body can pass through the upper opening and enter the recess, and the grindstone body is laterally formed. A side opening is formed so as to protrude from the opening but cannot pass therethrough. Therefore, even if the means for preventing the deviation of the grinding wheel body is not particularly taken by a separate member, the deviation of the grinding wheel body accommodated in the concave portion of the support member is prevented, so that the configuration can be simplified.

According to a seventh aspect of the present invention, the individual supporting members mounted on one side and the other side of the moving direction line of the blade are not entirely opposed to each other, and are halfway along the moving direction line of the blade. A part of the support member is in contact with the grindstone body supported by the opposed support member, and is prevented from deviating from the side opening of the grindstone body. Therefore, similarly to the invention described in claim 7, even if a means for preventing the deviation of the grindstone body is not particularly taken by another member, the support member supporting the grindstone body prevents the deviation of the opposed grindstone body. Therefore, the configuration can be simplified.

FIG. 1 is a front view of the present invention. FIG. 2 is a perspective view showing the inside of the main body. FIG. 3 is a perspective view of one half of the half body. FIG. 4 is a perspective view of the grindstone unit. FIG. 5 is a plan view of the grindstone unit. FIG. 6 is a perspective view of the disassembled grindstone unit as viewed from above. FIG. 7 is a perspective view of the disassembled grinding unit viewed from below. FIG. 8 is a perspective view of the support member as viewed from above. FIG. 9 is a perspective view in the case of cutting along the line AA in FIG. 5 and immersing the grindstone body. FIG. 10 is a side view showing a state where the kitchen knife is being polished.

  Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the sharpener 1 has a handle portion 2 and a sharpening groove 3 formed therein. As shown in FIG. 2, the sharpener 1 is composed of halved main bodies 4 and 5 and a grindstone unit 6.

  As shown in FIG. 6, the grindstone unit 6 includes a grindstone box 7, four coil springs 8, four support members 9, 10, and four grindstone bodies 11, 12. As shown in FIG. 5, the support members 9 and 10 are arranged such that two support members 9 are arranged on one side of the blade moving direction line 18 and two support members 10 are arranged on the other side. ing. Since the support members 9 and 10 on both sides are opposed by a half pitch along the movement direction line 18 of the blade, the grindstone bodies 11 and 12 on both sides supported by the support members 9 and 10 also have a half pitch. It is displaced, and the opposed grinding stone bodies 11 and 12 do not hit directly in front.

The two support members 9 arranged on one side and the two support members 10 arranged on the other side are separated from each other with a blade moving direction line 18 interposed therebetween to form a gap 19. At the time of polishing, the cutting edge of the cutting tool is inserted into the gap 19 to polish the cutting edge. Each of the grindstone bodies 11 and 12 has a spherical shape and is formed of a ceramic sintered body. In addition, the grindstone bodies 11 and 12 need not be spherical, and may be, for example, a truncated cone or an oval, as long as the shape can exert the effects of the present invention. In addition, the material is not limited to the ceramic sintered body, but may be a metal having a higher hardness than the blade of the blade, and may be any material that can polish the blade of the blade.

  Four columns 13 are formed at the bottom of the grindstone box 7. As shown in FIGS. 7 and 9, fitting holes 14 are provided on the bottom surfaces of the support members 9 and 10, respectively. The coil spring 8 is fitted on the support 13, the supporting members 9 and 10 are mounted on the coil spring 8, and the support 13 is fitted in the fitting hole 14. Thus, the support members 9 and 10 are supported by the coil spring 8 so as to be elastically movable in the vertical direction. Since each of the support members 9 and 10 is individually supported by the coil spring 8, each of the support members 9 and 10 can independently and elastically move vertically. When assembling the grindstone unit 6, the coil spring 8 is fitted onto the support 13 of the grindstone box 7 from above, and the support members 9 and 10 are placed on the coil spring 8 from above the coil spring 8. What is necessary is just to put the grindstone bodies 11 and 12 from above 9 and 10. In this way, the components can be assembled simply by placing the components sequentially from above.

As shown in FIG. 8, a recess 15 for receiving the grindstone body 12 is formed in the support member 10, and the recess 15 has an upper opening 16 and a side opening 17. As shown in FIG. 5, the shape of the upper opening 16 is formed in a C shape that forms a part of the circumference. The diameter of the circle formed by the upper opening 16 is slightly larger than the diameter of the grindstone body 12. Therefore, the grindstone body 12 placed in the concave portion 15 slightly protrudes from the side opening 17 of the concave portion 15 beyond the blade moving direction line 18, but cannot deviate from the side opening 17. In addition, as shown in FIG. 4, the grindstone body 12 placed in the recess 15 may be configured to protrude above the upper opening 16 of the recess 15, and as shown in FIG. An immersive configuration may be used. Further, the shape of the upper opening 16 may be a U-shape instead of the C-shape forming a part of the circumference as in the embodiment. In this case, the grindstone body 12 tries to slip out of the side opening 17 of the recess 15, but hits the side surface 21 of the opposing support member 9 and is prevented from deviating. In this way, the grindstone body 12 does not deviate from the side opening 17 of the recess 15, but each of the grindstone bodies 11 and 12 of the assembled grindstone unit 6 shown in FIG. It is. The other support members 9, 10 and the grindstone bodies 11, 12 supported by them have the same configuration.

  As shown in FIG. 3, in one half body 4, a half storage part 20 for storing the grindstone unit 6 is formed. The other half body 5 also has a storage section (not shown) symmetrical to the storage section 20, and the storage sections cooperate to store the grindstone unit 6. Protrusions 23 are formed on the inner surfaces of both side plate parts 22 of the storage part 20, respectively. On the other hand, grooves 25, 25 are formed on both side surfaces 24, 24 of the grindstone box 7, respectively. When the grindstone unit 6 is stored in the storage section 20, the grooves 25, 25 are formed on the protrusions 23, 23. Is fitted to the ridges 23 while sliding. Reference numeral 31 denotes a movement stop plate of the grindstone unit 6. The half body 4 has side plate portions 26 and 27 that form the sharpening groove 3. As shown in FIG. 2, the side plate portion 26 is located right above the grinding wheel body 11 on the half body 4 side of the housed grinding wheel unit 6, and the side plate portion is located directly above the other grinding wheel body 12 on the half body 4 side. Since the portion 27 is located, neither of the grinding stone bodies 11 and 12 deviates upward. These configurations are the same for the other half body 5.

  Connection pieces 28 and 29 are formed at the bottom of one half body 4. These connecting pieces 28 and 29 are not formed in the other half body 5, but are instead formed with screw holes (not shown), and are connected to the connecting pieces 28 and 29 through the screw holes. The halves 4 and 5 are connected by screws (not shown). Further, five locking pieces 30 are formed at the edge of the half body 4, and locking recesses (not shown) for locking with the locking pieces 30 are formed in the other half body 5. The edges of both halves 4 and 5 are brought into close contact with each other by these locking actions.

  FIG. 10 is a side view showing a state where the knife 32 of the wave blade is being polished. The wavelength of the wave blade is short on the blade base side and long on the cutting end side. This is because the short wavelength part has good bite into the object to be cut such as bread, so first, the blade edge is bitten by the wave edge, and after the bite, it is efficiently in the long wavelength part. Cut it off. The way of changing the wavelength is the case where the wavelength gradually increases from the blade side to the cutting side, and the same wavelength that is shorter from the blade side to a predetermined position, and the wavelength near the center of the blade is more than that. It may be the same long wavelength, and it may gradually increase to the same wavelength longer from there to the tip side. The way of changing the wavelength may be other than this. As is clear from FIG. 10, at the time of polishing, the cutting edge 33 of the kitchen knife 32 is turned downward, and the cutting edge 33 is inserted into the sharpening groove 3. Then, the knife 32 is moved back and forth to polish. The corrugated blade has the convex blades 34 and the concave blades 35 arranged alternately. When the convex blades 34 hit the grindstones 11 arranged on one side during polishing, the grindstones 11 are lowered, and then the next adjacent grindstones are disposed. When the concave blade 35 comes into contact with the grindstone body 11, the blade 33 is polished while the grindstone body 11 rises. That is, as the blade 33 of the wave blade moves up and down with the movement of the kitchen knife, the grindstone bodies 11 move up and down independently of each other in the same manner. You can say that it makes a good move.

  Next, the size of the present embodiment will be described. The overall length of the sharpener 1 is about 150 mm. The height of the support members 9 and 10 is about 17 mm, the length of the blade along the movement direction line 18 is about 7.5 mm, and the width in a direction perpendicular to that is about 5 mm. The diameter of the grindstone bodies 11 and 12 is about 5 mm. As mentioned above, the present invention contemplates the use of relatively small whetstones for such movable whetstones. For example, compared to the wavelength of conventional blades, not only large whetstones that are formed by only a long and narrow rectangular parallelepiped whetstone, but water is applied to the whetstone in advance and a knife such as a knife is laid to sharpen, as well as Very large wheels are not included in the movable wheel body of the present invention. Although the sizes are as described above, it goes without saying that the present invention is not limited to these numerical values.

  The present invention can take various aspects based on the above-described configuration. For example, the number of grinding stone bodies may be two or three, or five or more. Further, the grindstone bodies 11 and 12 may be directly supported by an elastic member such as the coil spring 8 without being supported by the support members 9 and 10. The whetstone body that can move up and down may be mounted on only one side of the movement direction line 18 of the blade. In that case, the grindstone body on the other side may be plate-shaped, and the length along the cutting edge may be a plurality of times the wavelength of the wave blade. In addition, the roughness of the grindstone body 11 on one side of the blade and the roughness of the grindstone body 12 on the other side may be different, and the roughness of each of the grindstone bodies 11 and 11 arranged on the same side may be different. You may make it different. A plurality of grindstone units 6 having different roughnesses of the grindstone bodies may be prepared so that they can be replaced as needed. Instead of the coil spring 8 supporting the support members 9 and 10, a leaf spring made of metal or synthetic resin may be used.

By attaching the grindstone body to the sharpener so as to be elastically movable in the vertical direction, it is possible to cope with the polishing of the wave blade.

  1 sharpener, 2 handle part, 3 sharpening groove, 4 half body, 5 half body, 6 whetstone unit, 7 whetstone box, 8 coil spring, 9 support member, 10 support member, 11 whetstone body, 12 whetstone body, DESCRIPTION OF REFERENCE NUMERALS 13 support, 14 insertion hole, 15 recess, 16 upper opening, 17 side opening, 18 blade moving direction line, 19 gap, 20 storage section, 21 side of support member, 22 side plate section, 23 ridge, 24 grindstone Box side, 25 groove, 26 side plate, 27 side plate, 28 connecting piece, 29 connecting piece, 30 locking piece, 31 stop plate, 32 kitchen knife, 33 cutting edge, 34 convex blade, 35 concave blade

Claims (7)

A manual sharpener that simultaneously grinds both sides of a blade with a plurality of grindstone bodies while moving the blade back and forth with its cutting edge facing downward, and a grindstone body that grinds at least one surface of the blade, The movable grindstone body is attached to each support member, and each support member is independently movable elastically in the vertical direction. A manual sharpener , which is supported by an elastic member so that each of the grindstone bodies moves up and down together with a support member that supports the grindstone body . The manual sharpener according to claim 1, wherein there are a plurality of whetstone bodies for polishing at least one surface of the blade. The manual sharpener according to claim 2, wherein the same number of grindstone bodies for polishing the respective surfaces of the blades are provided, and each grindstone body is attached to the sharpener so as to be elastically movable in a vertical direction. 4. The method according to claim 1 , wherein each support member has a recess for receiving the grindstone body, and the sharpener has means for preventing deviation of the grindstone body from the recess. 5. Manual sharpener. Each support member is mounted on both sides thereof with the blade moving direction line as a center line, the concave portion has a side opening facing the blade moving direction line, and the grindstone body supported by the concave portion is 5. The manual sharpener according to claim 4 , wherein the blade protrudes from the opening toward the opposing support member beyond the line of movement of the blade. An upper opening is formed on the upper surface of each support member, an upper opening is formed so that the grindstone body can pass through the upper opening and enter the recess, and the grindstone body protrudes from the side opening but cannot pass. The manual sharpener according to claim 5 , wherein a side opening is formed so as to satisfy the following condition. The individual support members mounted on one side and the other side of the blade movement direction line are not entirely opposed, and are opposed by a half pitch along the blade movement direction line, 6. The manual sharpener according to claim 5 , wherein a part of the support member contacts the grindstone body supported by the opposing support member to prevent the grindstone body from deviating from the side opening.

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