JP3145382U - A truncated conical whetstone and a knife sharpener using the same - Google Patents

Abstract

The present invention provides a grindstone that can be operated with only one hand during sharpening, that does not have an error in maintaining the angle of sharpening, and that can extend the sharpness and the life of the cutting edge, and a knife sharpener using the grindstone.
A plurality of grindstone portions 3 having a truncated cone shape of a knife sharpener and having an inclination in which the inner peripheral portion 1b of the circle is the highest and gradually decreases toward the outer peripheral portion 1c. It is provided radially with the inner peripheral part 1b as the center, and the top part 3a of the grindstone part 3 is a grindstone surface made of cemented carbide, artificial stone or ceramic. Two frustoconical whetstones having a space between the two frustoconical whetstones and a knife blade being inserted between them, and each frustoconical whetstone rotating as the inserted knife moves back and forth Is supported at right angles to the longitudinal movement direction of the knife.
[Selection] Figure 1

Description

  The present invention relates to a truncated conical grindstone and a knife sharpener using the grindstone.

  7A and 7B show a conventional knife sharpener, FIG. 7A is a perspective view, and FIG. 7B is a diagram showing a structure of a sharpening portion. The conventional knife sharpener 40 shown in FIG. 7 (a) is composed of a sharpening portion 40a for inserting the knife 8 and moving it forward and backward (movement direction 11) and a handle 40b for gripping the sharpener.

  As shown in FIG. 7 (b), the sharpening portion 40a is opposed to a rotating shaft 42 in which a conical or truncated conical rotating grindstone 41 is inclined with respect to the handle 40b so that the grindstone surface is V-shaped. And can be rotated.

  Since the rotating shaft 42 of the rotating grindstone 41 is not perpendicular to the movement direction 11 of the knife 8, the cutting edge of the knife 8 is pressed against the rotating grindstone 41, but the knife is in the A7 direction perpendicular to the rotating shaft. In order to prevent shifting, it is necessary to firmly support the handle 40b, which is a two-handed operation.

  The conventional rotating grindstone 41 has a problem in that since the grindstone portion is flat, the tip of the cutting edge is linear and the cross section of the cutting edge is finished flat, sharpness is not sharp, and the cutting edge life is short.

  Patent Document 1 is an invention of a conventional knife sharpener that is slidably mounted with a pressing portion that stabilizes the movement direction 11 of the knife 8 so that an amateur such as a housewife can easily reciprocate. However, both hands had to be used to hold the knife sharpener.

Japanese Patent Laying-Open No. 2005-193317 (pages 2, 3 and 1)

  An object of the present invention is to provide a grindstone that can be operated with only one hand during sharpening, does not have an error in maintaining the angle of sharpening, and can increase the sharpness and the life of the blade edge, and a knife sharpener using the grindstone. .

  The frustoconical grindstone of the present invention is a frustoconical abrasive grindstone of a knife sharpener, and has a plurality of grindstones whose inner circumference is the highest and gradually decreases toward the outer circumference. The portion is provided radially around the inner peripheral portion, and at least the top portion of the grindstone portion is a grindstone surface made of cemented carbide, artificial stone, or ceramic.

  The knife sharpener using the truncated cone-shaped grindstone of the present invention is configured such that the grindstone portion of one of the truncated cone-shaped grindstones is opposed to the grindstone portion of the other truncated cone-shaped grindstone. A knife blade is inserted between the two frustoconical whetstones, and each frustoconical whetstone rotates in accordance with the back-and-forth movement of the inserted knife. Two truncated conical whetstones are axially supported at right angles to the longitudinal movement direction of the knife.

  According to the truncated conical grindstone of the present invention, since a plurality of grindstone portions whose top portions are the grindstone surfaces are provided, the blade of the knife to be polished is polished into a corrugated shape, and is sharper than a conventional grindstone. It is good and the lifetime of a blade edge can be lengthened.

  In the knife sharpener of the present invention, since the two truncated cone-shaped grindstones are pivotally supported at right angles to the longitudinal movement direction of the knife, the angle of the knife and the hand that supports it is out of order like a conventional knife sharpener. In addition, since the truncated cone-shaped grindstone is in the form of a roller that rolls on the mounting surface by the longitudinal movement of the knife, there is no need for a handle for supporting the sharpening tool, which is conventionally required, and the need for two-handed work is eliminated.

  Embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of the position of a truncated conical grindstone according to the present invention, where (a) is a plan view and (b) is a cross-sectional view along BB of (a).

  As shown in FIG. 1 (a), a truncated conical grindstone 10 is provided with a circular hole 1a in the center of a disc 1, and a plurality of grindstone portions 3 on the surface of the disc 1 with an inner peripheral portion 1b as a center. It is provided radially toward 1c.

  The grindstone portion 3 has a deformed triangular pyramid that forms a top portion 3a that has a slope in which the inner peripheral portion 1b of the circle is highest and gradually decreases toward the outer peripheral portion.

  In other words, the grindstone surface that comes into contact with the knife of the knife in the present invention is not the surface like a conventional grindstone, but the top portion 3a of the grindstone portion 3. 3 b is the bottom side of the grindstone 3.

  The grindstone 3 has an inclined surface formed from the base 3b to the top 3a, and the truncated cone-shaped grindstone 10 in which a plurality of grindstones 3 are provided radially on the surface of the disk 1 has a substantially bevel gear shape. .

  As shown in the cross-sectional view of FIG. 1B, the apex 3a is formed at an inclination angle α with respect to the central axis, with the inner peripheral portion 1b being the highest and gradually lowering toward the outer peripheral portion.

  It should be noted that either the disc 1 and the grindstone portion 3 may be integrally formed or the grindstone portion 3 may be attached to the disc 1 for selection. In any case, at least the top of the grindstone portion 3 may be a grindstone surface made of cemented carbide, artificial stone, or ceramic.

  FIG. 2 shows a knife sharpener using a truncated conical grindstone according to the present invention, wherein (a) is a front view and (b) is an enlarged view of a main part with a knife inserted.

  The knife sharpener 20 of the present invention is configured so that the grindstone portion 3 of one truncated cone-shaped grindstone 10A is opposed to be positioned between the grindstone portions 3 of other truncated cone-shaped grindstones 10B. The two truncated cones have a space for inserting the blade 9 of the knife 8 between 10A and 10B, and the respective truncated cone-shaped grindstones 10A and 10B rotate in accordance with the longitudinal movement of the inserted knife. The shaped whetstone 10 is pivotally supported at right angles to the longitudinal movement direction of the knife.

  In FIG. 2A, 6 indicates a central axis. FIG. 2B shows a state in which each of the grindstone portions 3 of the left and right frustoconical grindstones 10 </ b> A and 10 </ b> B comes into contact with the blade 9 of the knife 8 and is polished.

  FIG. 3 is an explanatory diagram of a combination of truncated conical whetstones. As shown in the figure, the two truncated conical whetstones 10 </ b> A and 10 </ b> B are combined with each other so that the top 3 a of the other grindstone 3 is positioned between the tops 3 a of one whetstone 3. In the figure, 6 is a central axis.

  FIG. 4 is a partial cross-sectional view showing a side surface of the knife sharpener of the present invention with the knife inserted.

  The knife sharpener 20 faces the truncated conical whetstone 10 </ b> A (front side) and the truncated conical whetstone 10 </ b> B (back side) so that the grindstone portion 3 is positioned between the whetstone portions 3. Thus, the circular hole 1a is pivotally supported. In the drawing, the right half shows the grindstone portion 3 of the truncated conical grindstone 10B with the truncated conical grindstone 10A removed.

  The kitchen knife 8 is sandwiched between the truncated cone-shaped grindstones 10A and 10B, and the blade 9 is held in a groove having a cutting angle (180-α) formed by the top 3a of the front and rear grindstone portions 3. It is moved in the direction of movement 11 of the arrow.

  The knife sharpener 20 is rotated by the movement of the knife 8. At this time, the front side of the blade 9 is polished by the top 3a of the truncated conical grindstone 10A, and the back side of the blade 9 is the top of the truncated conical grindstone 10B. Polished by 3a.

  FIG. 5 is an explanatory view showing the form of the knife blade polished by the knife sharpener of the present invention, where (a) is a developed view of the top 3a of the rotating truncated cone-shaped grindstone, and (b) is polished. It is a bottom view of a kitchen knife.

  When the blade 9 of the knife 8 inserted in the knife sharpener 20 is moved in the movement direction 11 indicated by the right arrow, the truncated conical grindstone 10 rotates in the rotation direction 12 indicated by the arrow, and the top 3a of the grinding wheel part 3 is moved. However, the blade 9 is polished while turning in the turning direction 13 indicated by the arrow around the inner circumference.

  Each time the top 3a of the grindstone surface rotates, a part of the blade 9 of the knife 8 is polished within an angle λ to create a conical recess 14 at an angle α, and the polishing surface 9a of the blade 9 has a recess and a convex portion. Produces the waveform

  Similarly, the top 3a of the grindstone 3 on the opposite side of the kitchen knife 8 creates a conical recess 15 and generates a corrugation consisting of a recess and a convex on the polishing surface 9a of the blade 9.

  As a result, the blade 9 of the kitchen knife 8 is polished on both sides, and the tip of the blade 9 is polished into a corrugated shape 16, resulting in a sharp sharpness.

  As shown in FIG. 5B, the blade 9 of the knife 8 polished is formed into a corrugated blade shape by the dent 14 and the dent 15 by the grindstone portions 3 of the frustoconical grindstone 10 on both sides, and finished with a sharp sharpness.

  Polishing by such a corrugated blade is the effect of the truncated cone-shaped grindstone 10 of the present invention in which a plurality of grindstone portions 3 having top portions 3a are arranged radially.

  FIG. 6 shows an embodiment of the knife sharpener of the present invention.

  As shown in the figure, since the left and right truncated conical whetstones are pivotally supported and have a roller structure, there is no need for a handle unlike conventional sharpeners, and polishing can be performed by moving the knife back and forth with one hand. .

  Further, since the knife is inserted at a right angle to the rotation axis of the knife sharpener 20, there is no angle deviation.

The position embodiment of the truncated cone type grindstone of this invention is shown, (a) is a top view, (b) is BB sectional drawing of (a). The knife sharpener using the truncated cone-shaped grindstone of this invention is shown, (a) is a front view, (b) is the principal part enlarged view which inserted the knife. It is explanatory drawing of the combination of a truncated cone-shaped grindstone. It is a partial cross section figure which shows the side of the state which inserted the knife in the knife sharpener of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the form of the knife of the knife ground with the knife sharpener of this invention, (a) is a development view of the top part 3a of the rotating truncated cone-shaped grindstone, (b) is a bottom view of the polished knife. It is. It is one Embodiment of the knife sharpener of this invention. The conventional knife sharpener is shown, (a) is a perspective view, (b) is a figure which shows the structure of a sharpening part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc 1a Circular hole 1b Inner peripheral part 1c Outer peripheral part 3 Grinding stone part 3a Top part 3b Bottom 8 Knife 9 Blade 9a Polishing surface 10, 10A, 10B Cone-conical whetstone 11 Movement direction 12 Rotation direction 13 Turning direction 14 Recess 15 Depression 16 Waveform 20 Knife sharpener 40 Knife sharpener 40a Sharpening portion 40b Handle 41 Rotating grindstone 42 Rotating axis A7 direction α angle β angle λ angle

Claims (2)

  A grinding wheel with a truncated cone shape of a knife sharpener, wherein a plurality of grinding wheel portions having a slope in which the inner peripheral portion of the circle is highest and gradually decreases toward the outer peripheral portion are radially centered on the inner peripheral portion. A truncated cone-shaped grindstone characterized in that at least the top of the grindstone is a grindstone surface made of cemented carbide, artificial stone or ceramic. The grindstone portion of one of the frustoconical grindstones is formed so as to be opposed to the grindstone portion of the other frustoconical grindstone, and between the two frustoconical grindstones Two frustoconical whetstones are perpendicular to the direction of longitudinal movement of the knife so that the knife blades are inserted and the respective frustoconical whetstone rotates with the longitudinal movement of the inserted knife. A knife sharpener using a truncated conical whetstone that is pivotally supported.

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