JPH10235031A - Kitchen knife - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kitchen knife such that the core of the knife provided with a handle of a synthetic resin can be prevented from corroding, breaking from that part, and coming-off and dropping from the handle. SOLUTION: In a knife in which both sides of the core 2 of a knife member are held between handle members 3 and the core 2 and the handle members 3 are firmly coupled together by male and female rivets 4, 5, the handle members 3 are molded from a synthetic resin, and the surface of the core 2 is coated with a resin film 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knife used at home or the like.

[0002]

2. Description of the Related Art Most conventional knives use a natural wooden pattern or reinforced wood as a handle member. When using a wooden handle of a natural tree, a core is inserted from the tip of the wooden handle with a hole. Also, when using reinforced wood, the handle is divided into two handle parts, the core is sandwiched by the handle parts from both sides, and the core and the handle part are firmly connected by a metal bar and tack. I have.

Heretofore, a knife has only been cleaned by washing with water before or after use. In recent years, however, food poisoning caused by Escherichia coli has caused social problems, and therefore, it has become common practice in general households to sterilize Escherichia coli by applying boiling water to the handle of a knife. The reinforced wood used for the handle is formed by infiltrating a high-temperature-curable phenol resin into the internal structure of a veneer, laminating a large number of these, applying high pressure, and heat-molding. However, when hot water is applied to this reinforced wood, a slight odor is generated from the impregnated phenol resin, and many users dislike unpleasant odors because the knife is a tool for cooking food. Even in the case of a wooden pattern of a natural tree, boiling water produces a unique scent of wood, and some users dislike this scent.

Therefore, even if hot water is applied to the handle, no odor is generated, and the appearance and feel of the handle are the same as those of reinforced wood, and the handle is made of a synthetic resin such as polyacetal resin. Knives were developed. However, when molding a synthetic resin having a large thickness, a phenomenon occurs in which the surface of the resin is dented during cooling. Therefore, a gap is formed between the core and the synthetic resin handle member, and water accumulates therein. When the handle is made of natural wood or reinforced wood, these materials have air permeability, so there is no particular problem if moisture enters between the core and the handle, but the handle is made of synthetic resin. At one point, there was no air permeability, so that water remained, causing the core to rust.

The stainless steel used for the knife is a so-called martensitic stainless steel in terms of stainless steel, and is the steel material having the lowest corrosion resistance as compared with other ferritic and austenitic stainless steels. Stainless steel is an alloy in which 13% or more of chromium is added to iron. When exposed to oxygen in the air, an extremely thin oxide film is generated on the surface. This oxide film is so thin that the steel inside can be seen through while shining. Even if it is damaged, it regenerates immediately in the air, giving birth to the name of non-rusting steel.

[0006] The corrosion resistance increases as the chromium content increases. This is ferritic stainless steel. A steel having a chromium content of 18% or more and nickel added at 8% or more is known as the most corrosion-resistant stainless steel of the austenitic stainless steels.

[0007] However, the blade requires hardness. All cutting tools made of steel need to be hardened to have a hard altitude. Hardening is also required when making blades such as knives from stainless steel, and this requires carbon as an alloying component. The martensitic stainless steel is obtained by adding carbon to the aforementioned ferritic stainless steel. Although carbon in stainless steel is useful for quenching, it causes a reduction in corrosion resistance. This is because carbon combines with chromium and iron to form carbides. The chromium absorbed by the carbide no longer contributes to corrosion resistance. As a result, apparently, the chrome of the fabric is reduced, and the ability to form an oxide film is reduced, causing rust. That is, the martensitic stainless steel used for the knife rusts if there is moisture.

Therefore, even if stainless steel is used for the knife, as described above, the handle member is formed of synthetic resin, the core is clamped from both sides, and the handle member and the core are firmly connected with a metal bar and a stud. In the case of the structure, since the moisture easily remains in the gap between the handle member and the core, and the supply of oxygen is small, the corrosion of the core proceeds more rapidly than the blade portion.

When the material of the blade of the knife is carbon steel, the core is almost uniformly rusted and corroded over the entire surface, but the corrosion when the material of the blade is stainless steel is localized. There is a feature that occurs. If the core is scratched or dented, moisture will remain in the core and the circulation of air will be poor and the corrosion will proceed deeply and linearly. As a result, the core was actually corroded deeply in a narrow width even though there was no evidence of rust in appearance, and as shown in FIG. And the blade part comes off the handle. Therefore, if the knife bends in this way, the general user cannot avoid thinking that the core has been rusted, but inevitably misunderstand that the knife had a defect from the beginning.
For this reason, manufacturers are often replaced with new ones free of charge, which is a heavy burden.

In order to completely prevent the corrosion of the core, it is sufficient to replace this part with austenitic stainless steel having high corrosion resistance. This method cannot be used because it takes time and effort to weld, and the surface of the blade is apt to be scratched, which may lower the commercial value.

[0011]

As described above, a knife made of stainless steel using a synthetic resin for the handle member has a disadvantage that the core is corroded and broken. Therefore, an object of the present invention is to provide a knife which can prevent such a defect from occurring by simple means and at low cost.

[0012]

According to the construction of the present invention, both sides of the core 2 of the blade member 1 are clamped by the handle member 3, and the core 2 and the handle member 3 are connected by the metal rods 4 and 5, respectively. The handle member 3 is formed of a synthetic resin, and is characterized in that a resin film 6 is coated on the surface of the core 2.

[0013]

Since the present invention has the above-described configuration,
Even if moisture enters the gap between the core 2 and the handle member 3, the core 2 is covered with the resin coating 6, so that the core 2 can be prevented from rusting. Therefore, it is possible to prevent the core of the stainless steel knife in which the handle member and the core are joined by the metal bar and the stud using the synthetic resin handle member from being broken by rust, and the blade portion from coming off the handle. Here, as described above,
The cause of the breakage of the core is that even though there is no rusted trace in appearance, the core is actually deeply corroded in a narrow width, and a broken portion is formed from the corroded portion and the core is broken. However, if the knife bends in such a manner, even a person skilled in the art cannot avoid misunderstanding that the knife had a defect from the beginning without thinking that the core was rusted. That is,
Until the present invention was made, the cause of the core breaking in the form of a crack was not known. The present invention is a creation including the fact that the cause of the core breaking can be ascertained for the first time.

In order to coat the core 2 with the resin film 6, for example, a resin dissolved in a solvent is placed in a container, the core 2 is immersed therein, pulled up, and then dried. It has the effect that it is simple, hassle-free, and requires only a small cost. As another coating method, there is spraying by spraying. However, even this method has an effect that it is simple and requires low cost. It is also possible to paint with a brush. That is, it is very easy to coat the resin film 6 on the surface of the core 2, no special equipment for coating is required, and only the core needs to be processed. It can be done at cost.

As a material for coating the surface of the core 2, a metal coating by plating can be considered. However, since the metal coating uses a metal having a lower ionization tendency than stainless steel, which is the material of the knife, the coating is pin-foamed.
When the metal is present or the coating is slightly damaged, the core 2 having a higher ionization tendency than the coating corrodes at a rapid rate, so that plating cannot be used. On the other hand, since the present invention is a resin film, it does not react with the metal and does not act to accelerate the corrosion of the metal, so that the core can be prevented from rusting for a long period of time.

[0016]

Embodiments of the present invention will now be described with reference to the drawings. The blade member 1 is integrally formed of martensitic stainless steel. The core 2 is provided with three holes 7 for penetrating a male and a stud. A method of coating the resin film 6 on the core 2 is a solution 8 obtained by diluting 55% of toluene, 15% of xylene and 8% of butyl acetate with a thinner.
Is put in a container 9 and the core 2 is immersed in the solution 8, then the core 2 is pulled out and air-dried, so that the resin film 6 is coated on the surface of the core 2. Preferably, this coating operation is repeated about three times to form a durable film. If heat drying is performed instead of natural drying, the drying time is reduced.

The material of the resin film 6 may be a resin other than those described above, and a paint is mainly used. The paint used should be tough, have good adhesion and water resistance, and be excellent in electrical insulation. For example, a phenol resin paint or a vinyl resin paint is used.
The color of the resin film 6 is colorless and transparent, but is not limited to this, and other colors may be used. However, as shown by the shaded line in FIG. 3, when the tip portion of the coated resin film 6 cannot be covered by the pattern member 3 and protrudes from the pattern member 3 and is exposed, the exposed resin film 6 A colorless and transparent material is preferable so that 6 is not noticeable.

The method of coating the resin film is not limited to the method of dipping the core 2 in the solution as described above, and other methods may be used. For example, a simple and low-cost method such as a method of spraying a solution with a sprayer is used.

The handle member 3 is made up of two plate-shaped handle portions 10 and 10 and is made of a polyathletal resin which is a kind of synthetic resin. Each handle 10 is provided with three holes 11. This is for penetrating the studs 4 and 5. Each handle 10, 10 is a core 2
Handle 1 on both sides
0, 10 and the core 2 are firmly connected. The handle member 3 is not limited to the one divided into two handle portions as described above, but is integrally molded as a single body, has a U-shaped cross section, and has a deep groove for mounting a core in the center. Only the upper edge of the core 2 is exposed from the groove, and the lower edge of the core 2 is accommodated in the groove and not exposed.

In the finishing stage of the manufacture of the knife, the surface of the handle member is polished to remove scratches on the surface and to give gloss. At this time, the periphery of the core 2 exposed on the surface of the handle is also polished at the same time, so that the resin coating on that portion is naturally peeled off. However, even if there is no resin coating on the periphery of the core 2, since this portion is always exposed to the outside air, there is no possibility of rust like the blade portion.

When the studs 4 and 5 are directly in contact with the inner surface of the hole 11 of the core to be attached to the knife, the resin coating on that portion is damaged and the metal is exposed, causing corrosion. Therefore, preferably, the hole 11 of the core is formed large in advance, and a flat plate ring made of a synthetic resin such as a washer is inserted into the hole 11, and when the mandrel and the stud are penetrated, the hole of the mandrel and the hole 11 is formed. It is preferable to interpose a flat ring made of synthetic resin between the inner surfaces. This can prevent the resin coating in the core hole 11 from being damaged.

The material is 17% chrome, 2% molybdenum,
In the case of a 1% carbon knife, the probability of breakage of the core of the knife not processed according to the present invention is 1.013.
%, But 0.08 in the case of the knife embodying the present invention.
It dropped sharply to 7%.

[Brief description of the drawings]

FIG. 1 is a perspective view of a process for manufacturing the present invention.

FIG. 2 is a partially exploded perspective view of the present invention.

FIG. 3 is a front view of the present invention.

FIG. 4 is a front view of a blade with a broken core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blade member 2 Core 3 Handle member 4 Male stud 5 Male stud 6 Resin coating 7 Hole 8 Solution 9 Container 10 Handle 11 Hole

Claims (1)

[Claims] 1. A knife in which both sides of a core of a blade member are clamped by a handle member, and the core and the handle member are firmly connected by a metal bar and a stud. The handle member is formed of synthetic resin. Characterized in that a resin film is coated on the surface of the core.