JP4436385B2 - Blade polishing holder - Google Patents

Abstract

A cutting-tool holder (1; 101) for use in grinding includes a pinching portion (11; 111) and a connecting portion (12; 112). The pinching portion (11; 111) includes a pair of pinching pieces (11a, 11a) configured to pinch a blade of a kitchen knife. The connecting portion (12; 112) has a generally C-shaped cross section. The connecting portion (12; 112) connects base ends of the pinching pieces (11a, 11a) with each other, and is configured to bias the pinching pieces (11a, 11a) toward each other. Further provided in the cutting-tool holder (1; 101) is a retaining portion (20; 20'; 120) disposed at an inside of the connecting portion (12; 112) and configured to retain a back of the blade of the kitchen knife pinched by the pinching pieces (11a, 11a).

Description

  The present invention is an auxiliary tool for polishing a blade, and is an invention capable of maintaining the sharpness of the blade.

The angle of the incisor portion of the knife is important for the function of the knife, and the appropriate angle varies depending on the food culture area.
The angle of the incisor portion of the kitchen knife often used in Japan is about 10 to 15 degrees. This is because cutting is performed by a method in which the incisor portion of the knife is applied and slid against ingredients such as raw fish. If the angle of the incisor portion is an acute angle, the knife is easy to slide.
On the other hand, it is set to about 30 to 40 degrees in Western knives. This is to cut the ingredients by a method of cutting the ingredients such as meat, and since it is necessary to apply a large force, the angle of the incisor portion is large so as not to spill the blade.
Therefore, the sharpness of the knife means that the incisor portion of the knife is at the above angle in relation to how to cut the ingredients.

By the way, when the incisor portion of the knife is spilled or dull, the blade and the grindstone are brought into contact with each other at a predetermined angle of about 10 to 15 degrees (or about 30 to 40 degrees), and the angle Polishing is carried out repeatedly while keeping the angle constant, so that the angle of the incisor portion is set to a predetermined angle.
However, polishing while maintaining the abutting angle between the grindstone and the blade at a predetermined angle is an operation that requires skill.
In view of this, there has been disclosed a blade polishing holder that simply sets the contact angle between the blade and the grindstone to a predetermined angle (hereinafter referred to as “conventional blade polishing holder”, see FIG. 1).

This conventional type blade polishing holder is an invention comprising a holder body having a sandwiching part for sandwiching the blade of a knife, a connecting part having a substantially C-shaped cross section, and a gripping part for helping to open and close the holder body. According to the configuration of the invention, in a state where the blade is sandwiched in the holder body, the blade is placed on the grindstone and pressed against the blade from the upper side of the grindstone, so that the side surface of the blade is in contact with the inner surface of the sandwiching portion, The contact angle of the blade with respect to the grindstone is set to, for example, θ ₀ degrees (see FIG. 2A). And it was invention which became possible to make the incision angle of a blade into (theta) ₀ degree by rubbing back and forth, maintaining the force pressed against a blade from the upper side of a grindstone.
JP 2006-205283 A

However, in the case of the configuration of the above-described conventional blade polishing holder, the contact angle between the grindstone and the blade can be set to θ ₀ , but the blade swings due to the applied force when rubbing. The blade contact angle θ ₀ could not be kept constant.
Specifically, the force F ₁ for pressing the grinding direction for knife is weakened, as in FIG. 2 (b), the side surface of the blade is cause to float from the inner surface of the clamping portion, the contact angle theta ₁ to the grinding wheel It becomes larger than the θ _0. On the other hand, when the force F ₂ is too strong, the contact angle θ ₂ of the blade of the blade becomes smaller than θ ₀ during the friction as shown in FIG.
That is, according to the configuration of the conventional blade polishing holder, there is a problem that the contact angle θ ₀ changes depending on the magnitude of the force applied during the friction.

  In view of the above problems, an object of the present invention is to provide a blade polishing holder that can polish the blade of a knife at a predetermined angle and maintain the sharpness of the knife.

In order to solve the above-mentioned problem, the blade polishing holder according to claim 1 of the present invention is coupled to a sandwiching portion composed of a pair of sandwiching pieces for sandwiching the blade of a knife, and a base end side of the pair of sandwiching pieces, A cutter polishing holder comprising: a connecting portion having a substantially C-shaped cross section that biases the pair of sandwiching pieces in a direction approaching each other ; and a protective member made of synthetic resin and covering an inner peripheral surface of the connecting portion. The protective member has a locking portion that includes a pair of protrusions that project toward the clamping piece side and that form a groove that can accommodate the blade side of the knife sandwiched between the clamping portions, The groove formed by the pair of protrusions is substantially V-shaped so that the groove width becomes wider toward the sandwiching part.

The invention according to claim 2 is characterized in that the groove of the connecting portion is formed at a position corresponding to the bottom side of the groove formed by the pair of protrusions .

According to a third aspect of the present invention, in the blade polishing holder according to the first or second aspect, a reinforcing material is provided on the outer peripheral surface of the connecting portion. According to the invention which concerns on Claim 3 , the outer peripheral surface side of the connection part contact | abutted to a grindstone can be protected and abrasion can be suppressed.

The invention according to claim 4 is the blade polishing holder according to any one of claims 1 to 3, wherein the connecting portion having a hole and one end are attached to the pair of sandwiching pieces, The other end has a grip portion formed of a pair of grip pieces penetrating the hole portion and extending to the opposite side of the pair of clamping pieces.
According to the invention which concerns on Claim 4 , the attachment or detachment operation | work of the blade of a knife becomes easy with respect to a blade grinding | polishing holder. In addition, the gripping piece does not interfere with the grindstone when the gripping piece penetrates not the outside of the connecting portion but the inside.

According to a fifth aspect of the present invention, in the blade polishing holder according to any one of the first to fourth aspects, a protective member that covers the inside of the pair of clamping pieces is further provided.
According to the invention which concerns on Claim 5 , since not a clamping part but a protection member contacts with the blade of a knife directly, while a blade becomes difficult to be damaged, a blade becomes difficult to slip.

  According to the present invention, the contact angle between the blade and the grindstone is constant regardless of the force applied during sliding during the polishing operation, so the angle of the incisor portion after polishing is set to a predetermined angle. Can do. As a result, the sharpness of the knife can be maintained.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 3 is a perspective view illustrating the entire blade polishing holder 1 according to the embodiment, and FIG. 4 is a front view of the blade polishing holder 1 illustrated in FIG. 3.

  As shown in FIGS. 3 and 4, the blade polishing holder 1 of this embodiment includes a holder main body 10 that sandwiches the blade of a knife, a locking portion 20 provided inside the holder main body 10, and the holder main body 10. The protective member 30 is fixed to the inner peripheral surface of the holder body, the reinforcing member 40 is fixed to the outer peripheral surface of the holder main body 10, and the grip portion 50 is attached to the holder main body 10. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 4. The blade polishing holder 1 is formed symmetrically about the central axis C.

  The holder body 10 includes a sandwiching portion 11 having a pair of sandwiching pieces 11a and 11a for sandwiching the blade of a kitchen knife, and a connecting portion 12 coupled to the base end side of the pair of sandwiching pieces 11a and 11a. Is integrally formed by press-molding one stainless steel plate, steel plate or the like.

The clamping part 11 consists of a pair of clamping pieces 11a and 11a. As shown in FIG. 5, the sandwiching piece 11 a includes a distal end portion 11 b that sandwiches the side surface of the blade, and a proximal end portion 11 c that is integrally formed with and coupled to the opening portion 12 a of the connecting portion 12. In addition, the sandwiching piece 11a is substantially in a letter shape so that the tip end portion 11b is parallel to the side surface of the blade that is sandwiched. Thereby, the blade of a knife can be clamped stably. Further, it is possible to prevent the sandwiched blade from sliding, and the blade engaged with the locking portion 20 does not come out during polishing.
It has a hole 11d (see FIG. 4) punched into a substantially rectangular shape for allowing a protrusion 30a of a protective member 30 to be described later to penetrate.

The shape of the connecting portion 12 is a substantially rectangular shape when viewed from the front as shown in FIG. 4, and is approximately C-shaped when viewed from the side as shown in FIG.
Moreover, as shown in FIG. 5, the opening part 12a of the connection part 12 is formed integrally with the base end part 11c of the clamping piece 11a. Thereby, even if the clamping pieces 11a and 11a are opened, they are elastically biased so as to approach each other.
The connecting portion 12 is formed with gripping piece holes 12b and 12c (see FIG. 5) and a reinforcing material hole 12d (see FIG. 3) by punching.

  Since the protection member 30 is for preventing the side surface of the blade from being directly pinched by the sandwiching piece 11a, the material may be a synthetic resin such as polyethylene (PE) having a hardness lower than that of the blade. . The shape of the protection member 30 is substantially the same as that of the holder body 10, but it is desirable to cover a groove 20a, which will be described later, in order to facilitate engagement of the blade. Moreover, you may extend so that the front end side 11b of the clamping piece 11a may be covered (refer FIG. 5). According to this, it can prevent that a blade contacts the front-end | tip part 11b of the clamping piece 11a, and is damaged. The protective member 30 may be fixed to the inner peripheral surface side of the holder main body 10 with an adhesive, but, as in the present embodiment, the portion corresponding to the hole portion 11d formed in the sandwiching piece 11a is turned over. The protective member 30 may be fixed to the holder body 10 by providing the protruding portion 30a and fitting it into the hole 11d. Further, as shown in FIG. 5, the protection member 30 is provided with gripping piece hole portions 30 b and 30 c through which a pair of gripping pieces 50 a and 50 a described later penetrate.

As shown in FIGS. 3 and 5, the locking portion 20 according to the present embodiment includes a groove 20 a and a pair of protrusions 20 b and 20 b. The groove 20a is a groove having a substantially U-shaped cross section formed on the inner peripheral surface of the connecting portion 12. However, the groove 20a is not limited to the shape, and may be a groove having a substantially U-shaped cross section. Also, the groove 20a needs to have a size that can accommodate the blade of the blade.
The pair of protrusions 20b and 20b have a shape in which the protective member 30 near the edge of the groove 20a protrudes from the groove 20a toward the sandwiching piece 11a. Further, the pair of protrusions 20 b and 20 b are formed integrally with the protection member 30.
Thus, if the latching | locking part 20 which consists of the groove | channel 20a and the protrusions 20b and 20b is arrange | positioned in the connection part 12, the blade side clamped by the holder main body 10 can engage. Even if force is applied from the upper side of the blade, the blade can be polished while maintaining a constant contact angle without changing the contact angle between the grindstone and the blade.
In addition, it is desirable that the shape of the locking portion 20 formed by the groove 20a and the pair of protrusions 20b and 20b be substantially V-shaped in cross section because it can be engaged with blades having different widths.

As shown in FIG. 4, the reinforcing member 40 has a substantially rectangular shape when viewed from the front, but is not limited to the shape in the present invention, and may be any shape that covers the outer peripheral surface of the connecting portion 12.
The reinforcing member 40 is fixed to the outer peripheral surface of the connecting portion 12 by spot welding or the like, but in addition, a protruding portion 40a extending so as to fit into the reinforcing member hole portion 12d may be provided (see FIG. 3). ). According to this, even if the reinforcing member 40 is slid in the longitudinal direction, the protrusion 40a is caught in the reinforcing member hole 12d, so that the fixing to the connecting portion 12 can be strengthened.
Further, since the reinforcing material 40 is a member that comes into contact with the grindstone, it is desirable that the material of the reinforcing material 40 has wear resistance. Here, as what has abrasion resistance, for example, mild steel such as steel that is not quenched is desirable.

The gripping part 50 includes a pair of gripping pieces 50a and 50a. The gripping piece 50a is formed by forming a single plate made of stainless steel, steel, or the like into a substantially T-shape when viewed from the front, but is not limited to this shape.
As shown in FIG. 5, one end side of the gripping piece 50a is fixed to the outer peripheral surface of the holding piece 11a by spot welding or the like. Further, the other end side extends through and extends through the gripping piece hole portions 12 b and 12 c formed in the connecting portion 12 and the gripping piece hole portions 30 b and 30 c formed in the protective member 30. Thus, the gripping piece 50a does not interfere with the grindstone by passing the gripping piece 50a through the inside instead of the outside of the connecting portion 12 or the like.
Moreover, the recessed part 50b for making a user easy to press the holding | grip piece 50a, and the rib part 50c for preventing the deformation | transformation by the force added when pinching may be formed.

  According to the above configuration, the clamping pieces 11a and 11a are opened by pressing the recesses 50b and 50b in the direction in which the gripping pieces 50a and 50a are close to each other. Then, the blade can be inserted into the locking portion 20 by inserting the blade from the tip end portions 11b and 11b side where the blade is opened. Moreover, since the clamping pieces 11a and 11a are closed by the elastic biasing of the connecting portion 12, the blade can be clamped.

Next, a method for polishing the knife 2 using the blade polishing holder 1 will be described with reference to FIGS. FIG. 6 is a view showing a method of attaching the blade polishing holder 1 to the knife blade,
6 (a) shows a state of the opening method of the blade polishing holder 1, FIG. 6 (b) shows a state in which the knife blade is inserted into the blade polishing holder 1, and FIG. FIG. 3 is a view showing a state in which the blade polishing holder 1 holds the blade. FIG. 7 is a cross-sectional side view showing the usage state of the blade polishing holder 1, and FIG. 7 (a) shows a state in which the blade polishing holder 1 sandwiching a knife is placed on a grindstone. (B) is a figure which shows the state which slides the loaded holder 1 for blade grinding | polishing. FIG. 8 is a perspective view showing a state in which the knife 2 is being polished using the blade polishing holder 1.

  First, a method for mounting the blade polishing holder 1 will be described. A finger is applied to the concave portions 50b and 50b of the gripping pieces 50a and 50a, and the pressure is applied in the direction of the white arrow shown in FIG. Thereby, the clamping pieces 11a and 11a coupled to the gripping pieces 50a and 50a are opened. Then, as shown in FIG. 6 (b), the knife 2a of the knife is inserted with the blade 2a side facing between the holding pieces 11a and 11a that are opened. At that time, the blade 2a is pushed in until the groove 2a comes into contact with the protective member 30 covering the groove 20a. And when the said pressurization is stopped, 11a and 11a are closed by the elastic bias of the connection part 12, and as shown in FIG.6 (c), the blade 2a can be held. By such a method, the blade polishing holder 1 is mounted on the knife.

Next, a method for polishing a knife equipped with the blade polishing holder 1 will be described. As shown in FIG. 7A, the blade polishing holder 1 with the blade 2 a interposed therebetween is placed on the grindstone 3. In this state, the contact angle of the blade 2a with the grindstone 3 is θ.
While maintaining the state, as shown in FIG. 8, sliding is repeatedly performed on the grindstone 3 while applying a force to the blade from the upper side of the grindstone 3. Thereby, the blade 2a can be sharpened. Here, FIG. 7B is a side cross-sectional view showing the state at the time of rubbing, but even if the force at the time of rubbing is applied, the blade 2a only on the side of the blade 2c is housed in the locking portion 20 and is engaged. Therefore, the contact angle θ shown in FIG. 7A does not change and sharpening can be performed while maintaining a constant angle. Thereby, the angle of the incisor portion 2b of the blade 2a can be set to θ.

  When one side of the blade is polished, the knife 2 equipped with the blade polishing holder 1 is reversed, and the other side is also polished by the method described above. When polishing the knife 2, lubricating oil such as water or oil may be used as appropriate.

In general, the contact angle θ is preferably 10 to 15 degrees for a Japanese knife, and about 30 to 40 degrees for a Western knife.
Further, the contact angle θ is determined by the width of the blade and the shape of the polishing holder, but if the radius of the substantially C-shaped cross section of the connecting portion 12 is small, the contact angle θ is small and the radius is large. If so, the contact angle θ increases. Therefore, if the shape of the connecting portion 12 is set in accordance with the optimum angle of the incisor, the blade and the grindstone can be brought into contact with each other at a desired angle.

  According to the blade polishing holder 1 according to this embodiment described above, the blade side sandwiched between the holding portions 11 is engaged with the groove as the locking portion 20, so that the blade 2 a can swing. The contact angle of the blade 2a with respect to the grindstone 3 is always constant.

  The present invention has been specifically described above based on the blade polishing holder 1 according to the embodiment. Next, based on FIGS. 9 and 10, a blade polishing holder 101 which is a modification of the blade polishing holder 1 will be described. FIG. 9 is a perspective view showing the entire blade polishing holder 101. FIGS. 10A and 10B are diagrams showing a method of holding the knife blade with respect to the blade polishing holder 101, where FIG. FIG. 4 is a diagram showing a stage in which a blade 102a is clamped by a blade polishing holder 101.

Unlike the above-described blade polishing holder 1, the blade polishing holder 101 shown in FIG. Moreover, the latching | locking part 120 does not have the projection part 20b unlike the latching | locking part 20 of the holder 1 for blade grinding | polishing.
The blade polishing holder 101 includes a holder main body 110 including a sandwiching portion 111 and a connecting portion 112, a locking portion 120, a protection member 130, and a reinforcing material 140.
The connecting portion 112 is the same as the connecting portion 12 described in the embodiment. Similarly, the clamping part 111 is the clamping part 11, the groove 120 a relating to the locking part 120 is the groove a relating to the locking part 20, the holder body 110 is the blade polishing holder 10, and the protection member 120 is the protection member 20. Since the reinforcing material 140 is the same as the reinforcing material 40, description thereof is omitted.

  Hereinafter, a method of using the blade polishing holder 101 will be described. First, as shown in FIG. 10A, the blade 102 d is brought into contact with the groove with the blade 102 a of the knife 102 c facing the groove 120 a as the locking portion 120. Then, as shown in FIG. 10B, the knife is pressed toward the holder main body 110. As a result, the blade 102a of the knife is sandwiched between the sandwiching portions 111. Hereinafter, the blade 2a is polished by the method described in paragraph 0025 and subsequent paragraphs. The knife blade holder 101, which is a modified example, can also polish the knife blade at a certain angle.

  The polishing holder 1 and the like according to the embodiment have been described above, but the present invention is not limited to this embodiment, and can be implemented with appropriate modifications.

It is a perspective view of the whole conventional blade grinding | polishing holder based on a prior invention. It is sectional drawing which shows the state at the time of use of the conventional type blade grinding | polishing holder based on a conventional invention, (a) is the state which pinched the blade, and added the force F, (b) is the state when the force F is weak, (C) is a side view showing a state where force F is strong. It is a perspective view of the whole blade grinding | polishing holder which concerns on embodiment. It is a front view of the holder for blade grinding | polishing which concerns on embodiment. It is the sectional view on the AA line of the blade grinding | polishing holder shown in FIG. FIG. 6 is a view showing a method for mounting the knife polishing holder 1 according to the embodiment on a knife, and FIG. 6 (a) shows a state of an opening method of the blade polishing holder 1 in FIG. 6 (b). FIG. 6C is a diagram showing a state in which a knife blade is inserted into the blade polishing holder 1, and FIG. 6C is a diagram showing a state in which the blade polishing holder 1 holds the blade. It is sectional drawing about the grinding | polishing method using the blade grinding | polishing holder which concerns on embodiment, Comprising: (a) is the state mounted in the grindstone, (b) is a figure which shows the state which is grind | polished. It is a usage drawing of the blade grinding | polishing holder which concerns on embodiment. FIG. 9 is a perspective view showing the entire blade polishing holder 101 according to a modification. 10A and 10B are diagrams illustrating a method of holding the knife blade with respect to the blade polishing holder 101, where FIG. 10A illustrates a state in which the cutting edge is in contact with the engaging portion 120 of the blade polishing holder 101, and FIG. FIG. 11 is a diagram showing a stage in which the blade 102a is sandwiched between the blade polishing holders 101.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Knife polishing holder 2 Knife 2a Blade 2b Cutting blade 2c Mine 3 Grinding stone 10 Holder main body 11 Holding part 11a Holding piece 12 Connection part 20 Locking part 20a Groove 20b Protrusion 30 Protection member 40 Reinforcement material 50 Holding part 101 For blade polishing Holder 102a Blade 102c Mine 102d Cutting edge 110 Holder body 111 Holding part 112 Connection part 120 Locking part 130 Protection member 140 Reinforcing material

Claims (5)

A sandwiching portion composed of a pair of sandwiching pieces for sandwiching the blade of a kitchen knife, and a connecting portion having a substantially C-shaped cross section that is coupled to a proximal end side of the pair of sandwiching pieces and biases the pair of sandwiching pieces in a direction approaching each other And a protection member for covering the inner peripheral surface of the connecting portion , made of synthetic resin, and a blade polishing holder comprising:
The protective member has a locking portion that includes a pair of protrusions that protrude toward the holding piece side and that form a groove that can accommodate the blade side of the knife sandwiched between the holding portions. The groove formed by the protruding portion is a substantially V-shaped holder whose groove width becomes wider toward the clamping portion. 2. The blade polishing holder according to claim 1, wherein the groove of the connecting portion is formed at a position corresponding to a bottom side of the groove formed by the pair of protrusions. The blade polishing holder according to claim 1 or 2, wherein a reinforcing material is provided on an outer peripheral surface of the connecting portion. The connection part having a hole part, and one end attached to the pair of holding pieces, the other end penetrating the hole part, and a pair of gripping pieces extending to the opposite side of the pair of holding pieces The blade polishing holder according to any one of claims 1 to 3 , further comprising a gripping portion. The blade polishing holder according to any one of claims 1 to 4, further comprising a protective member that covers the inside of the pair of sandwiching pieces.

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