JP2589658B2 - Metal components included in footwear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal component contained in footwear such as shoes.

[0002]

2. Description of the Related Art Conventionally, for example, when manufacturing leather shoes, a heel portion of a last covered by a shoe upper is covered with a moon core.
Hammering a metal nail. In addition, a shank that is curved so as to conform to the shape of the arch is attached to the center core. Further, when attaching the heel to the outsole, a metal embedding nail is hit. These fixed nails, shank, and embedded nails are left in the shoe even after the leather shoe is completed.

[0003] On the other hand, the last, the core and the outsole are mutually bonded by an adhesive during the manufacturing process. Until the bonding is completed, a temporary nail made of metal is nailed in the vicinity of the toe. Be stopped. After the bonding is completed, such temporary nails are removed.

[0004]

In the leather shoes manufactured through the above-described processes, there is a case where the user forgets to pull out the temporary nails hit in the manufacturing process. Therefore, if temporary nails remain in the shoes due to forgetting to pull them out and protrude into the shoes, there is a risk of being pierced into the soles of the feet of the user who purchased the shoes, causing a serious accident that threatens the human body. There is a possibility that it will be in the future.

[0005] For this reason, shoe manufacturers inspect whether they have forgotten to remove temporary nails before shipping leather shoes as commodities. If a temporary nail that has been forgotten to be removed is embedded inside the shoe sole from the surface, it is difficult to visually check the presence of the temporary nail from the outside. They are groping to check for temporary nails.

However, such groping inspections are extremely inefficient and hinder the shipment of large quantities of goods. In addition, if the temporary nails remain, there is a risk that the finger of the inspection worker may be injured, and this will make the worker's work cautious and further delay the inspection.

Therefore, the present inventors have found that it is advantageous to use a magnetic detecting means used as a needle meter for clothing in order to mechanically inspect whether the temporary nail has been forgotten as described above. did.

[0008] That is, in the field of clothing, in order to confirm whether the user has forgotten to remove the staple, or whether there is no broken needle of the sewing machine needle broken at the time of sewing, the clothing is read by a magnetic induction method or an electromagnetic induction method. Preliminary checks have been conducted to prevent accidents. In the field of clothing, meter reading is generally performed twice. In other words, the first needle inspection is performed after attaching relatively small accessories such as fasteners, front rings, snaps, etc. attached to the sewing machine in the sewing process, and then examining whether the sewing machine needle remains. (For convenience, referred to as high-sensitivity meter reading).
In the second meter reading, after attaching a relatively large accessory such as a metal button, it is checked whether the user has forgotten to remove the needle (for convenience, referred to as a low-sensitivity meter reading). For example, SANKO ELECTRONICS LABORATORY CO., LTD.
Address), two sensitivity levels (detection ability) are provided: A sensitivity for the high-sensitivity meter reading and B sensitivity for the low-sensitivity meter reading. .

The A sensitivity has a detection capability equivalent to 1.2 mmφ in terms of iron ball in order to detect a sewing needle. Therefore, in order for a fastener, a front ring, a snap, and the like mounted on the clothing to be searched for at the A sensitivity to clear the A sensitivity, it must be 1.1 mmφ or less in terms of an iron ball. On the other hand, the B sensitivity has a detection capability equivalent to an iron ball equivalent to 2.5 mmφ for detecting a town needle. Therefore, in order to clear the B sensitivity, a metal button or the like mounted on the clothing subjected to the search at the B sensitivity must have an iron ball equivalent of 2.4 mmφ or less.

By the way, it has been found that a sensitivity equivalent to the B sensitivity is sufficient for detecting forgetting to pull out a temporary nail in a shoe using the same magnetic detection means as the needle meter.

That is, when a temporary nail used for temporary fixing of leather shoes is subjected to a needle tester function test and measured, it is equal to or more than 2.7 mmφ in terms of iron ball per temporary nail, and is detected by the B sensitivity. It is possible. Therefore, by letting the leather shoes pass through the magnetic detecting means under the detecting ability equivalent to the iron sensitivity equivalent to the B sensitivity of 2.5 mmφ, forgetting to remove the temporary nail can be detected.

However, as described above, since metal components such as fixed nails, shank, and embedded nails are left in the completed shoe, the shoe is used as the magnetic detecting means. When you pass, regardless of whether you forget to remove the temporary nail,
The B sensitivity cannot be cleared. That is, as a result of the present inventors, a set of a conventionally used shank, eight fixed nails, and three embedded nails was subjected to a needle test function test. Sphere equivalent 8.0mm
It was found that the diameter was not less than φ, and an abnormal signal was always generated from the magnetic detection means. And, no matter how much the mass of these metal components is reduced by thinning or thinning, it cannot be reduced to 2.5 mmφ or less in terms of iron ball detected by the B sensitivity of the low-sensitivity meter. In particular, only one shank included in leather shoes cannot satisfy the B sensitivity.

[0013] In this regard, fixed nails, shank,
If a metal component such as an embedded nail is formed of, for example, a synthetic resin, no magnetism is detected, but it is almost impossible to substitute the material of the metal component included in these shoes with a synthetic resin. . For example, fixed nails and embedded nails
The tip must be extremely sharp and bends or breaks without enduring the impact of hitting. In addition, the shank needs to have a strong elasticity that can hinder a load corresponding to the weight of the user and resiliently recover from repeated deformation during walking.

[0014]

SUMMARY OF THE INVENTION The present inventors have determined that fixed nails, shank, embedded nails, and other metal components contained in shoes remain made of tough metal. However, it has been found that the above-mentioned problem can be solved by configuring the magnetism detecting means so as to be non-magnetic with an iron ball equivalent of 2.5 mmφ or less that can clear the sensitivity equivalent to the B sensitivity in the magnetic detecting means.

The tough metal material used in the present invention may be selected from metals that are non-magnetic per se.

When considering the toughness, workability and cost of the material, for example, austenitic stainless steel can be selected. This is because austenitic stainless steel is generally considered to be non-magnetic. However, if a commercially available austenitic stainless steel fixed nail, shank, and embedded nail were prototyped and passed through magnetic detection means, it would not be possible to achieve the sensitivity equivalent to the B sensitivity described above. found.

That is, among the austenitic stainless steels available on the market, if a shank is formed by SUS304, the B sensitivity cannot be cleared at all. This indicates that austenitic stainless steel is generally considered to be non-magnetic, but it is presumed that at a severe level of sensitivity such as the B sensitivity described above, the reaction has inevitable micromagnetism. Alternatively, even if it is non-magnetic, it is theoretically known that it is magnetic depending on its chemical composition and the rate of cold working, and when cold working is performed, part of austenite turns into martensite. It is presumed that it was transformed and became magnetic, resulting in the above-described results.

The metal component contained in the footwear according to the present invention is advantageously made of stainless steel because it has excellent toughness and does not require plating treatment. In order to solve the above problem, it is necessary to form the magnet from a nonmagnetic austenitic stainless steel.

In the case of using austenitic stainless steel, it is preferable that the chemical component contains at least 0.1% or more of N in order to demagnetize the stainless steel.
Moreover, in order to improve the workability in addition to the non-magnetic properties, it is more preferable to contain Cu.

The best mode in the case of using austenitic stainless steel is that, among the chemical components, C is 0.01 to 0.05%, Si is 1.0% or less, and Mn is 3.0 to 7.0%. , Ni at 5.0 to 6.0%, and Cr at 1
7.0 to 19.0%, Cu is 1.0 to 4.0%
%, Nb is 0.2% or less, and N is 0.1 to 0.3%.

Another best mode when using austenitic stainless steel is that C among the chemical components is set to 0.0.
7 to 0.10%, Si is 1.0% or less, Mn is 9.
0 to 10.0%, Ni 5.0 to 6.0%, C
r is set to 17.5 to 18.5%, and N is set to 0.25 to 0.35%.

Further, the metal component contained in the footwear according to the present invention can be selected from titanium because it has excellent toughness, does not require plating, and is light in weight.

Titanium is suitable as a constituent of footwear due to its light weight, and is non-magnetic, so that the above-mentioned object of the present invention can be suitably achieved.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a men's leather shoe as an example of footwear. A heel portion of the last 2 covered by the upper 1 is covered with a moon core 3, and a plurality of fixing nails 4 are driven along the periphery of the moon core 3.

A shank 6 which is curved so as to conform to the shape of the arch is attached to the core 5 having an insole.

When attaching the heel 8 to the outsole 7,
A plurality of embedding nails 9 are driven, and a decorative plate 10 is adhered to the surface of the heel 8.

The last 2, the core 5 and the outsole 7 provided with the moon core 3 are adhered to each other by an adhesive during the manufacturing process.
It is temporarily fixed by hitting a metal temporary nail (not shown), and after the bonding is completed, the temporary nail is pulled out.

The manufacturing process itself of such a shoe is known in the prior art. However, when the present invention is applied to a shoe, the metal components such as the fixing nail 4, the shank 7, the embedding nail 9, and the like are not tough. It is made of a metal material that satisfies magnetism.

That is, in the leather shoe according to the present invention, the metal components such as the fixing nail 4, the shank 7, and the embedding nail 9 have the same shapes and dimensions as conventionally known ones. Regardless of the presence or absence of the metal material, a metal material satisfying toughness and non-magnetism is selected as the metal material.

As shown in the figure, the metal component included in the leather shoe embodying the present invention is usually composed of a fixing nail 4, a shank 7, and an embedding nail 9. By doing so, the nails such as the fixing nail 4 and the embedding nail 9 can be made unnecessary, and only the shank 7 may be made of a metal component. Therefore, in the case of leather shoes, the metal component of the present invention may be constituted by nails such as the fixing nail 4 or the embedded nail 9 and the shank 7 or may be constituted only by the shank 7.

As described above, when selecting a metal material that satisfies toughness and non-magnetism, the austenitic stainless steel is preferably selected as the metal component of the leather shoe composed of at least the shank 7, and the austenitic stainless steel is preferably used. It is manufactured by processing.

As described above, austenitic stainless steel is generally considered to be non-magnetic,
304, SUS305, SUS310, SUS316,
In addition, when the shank 6 is experimentally manufactured using a commercially available product, the B sensitivity of the needle detector can not be cleared at all. Out of stainless steel
In particular, non-magnetized stainless steel is used.

Particularly, in the case of nails such as the shank 6 formed by cold working and the fixed nail 4 and / or the embedded nail 9, the austenitic stainless steel is used, and the chemical component is at least N = 0. Use those containing 1% or more.

According to the knowledge of the present inventors, austenitic stainless steel usually has an austenitic structure at normal temperature, but when cold worked, a part or most of austenite is transformed into martensite and becomes magnetic. Will take on. However, when N, which is considered to be an austenite-forming element, is included, the tendency to transform into martensite is reduced. According to the experiments of the present inventors, in order to demagnetize the magnetic property of the metal component such as the shank or nail as described above until the B sensitivity of the needle detector falls below 2.5 mmφ in terms of iron ball, Good results were obtained by containing N at 0.1% or more.

Further, in order to facilitate the cold working of such a metal component, it is necessary to use a non-magnetized austenitic stainless steel as described above, which contains Cu as a chemical component. It is good to make it. According to the findings of the present inventors, the inclusion of Cu facilitates deformation during cold working. Moreover, Cu
Is considered to form an austenite-forming element like N, and contributes to weakening the tendency to transform into martensite by cold working, and has an effect similar to two birds per stone.

Next, an embodiment considered as the best mode of the present invention will be introduced.

Example 1 A flat plate of austenitic stainless steel having the following chemical components was cold-worked to form a shank 6 for a shoe similar to a conventionally known shape and size.
Was made. The chemical composition of steel is 0.04% C, Si
Is 0.40%, Mn is 5.15%, P is 0.030%,
S 0.000%, Ni 5.55%, Cr 18.2
1%, Cu 2.47%, Nb 0.09%, N 0.4%.
193%. The shank has a thickness of about 1.20 mm, a width of about 12.0 mm, a total length of about 110.0 mm, and a weight of about 10 g.

The shank of Example 1 was subjected to a needle test function test and found to be equivalent to 1.5 mmφ in terms of iron ball. Therefore, the B-sensitivity of the needle detector (manufactured by Sanko Electronics Research Laboratories) used for the clothing could be cleared without any problem.

By the way, at the time of the needle meter function test, the chemical components of C were 0.01 to 0.05% and Si was 1.
0% or less, Mn is 3.0 to 7.0%, and Ni is 5.0
To 6.0%, Cr is 17.0 to 19.0%, C
Several types of shanks were manufactured by changing u in the range of 1.0 to 4.0%, Nb in the range of 0.2% or less, and N in the range of 0.1 to 0.3%, and each of the shanks was subjected to a test. It was determined that the iron ball equivalent was 1.7 mmφ or less.

With respect to the composition of the chemical components, the conventional SU
S304, SUS305, SUS310, SUS316
Etc. all make Mn 2.00% or less,
In the above embodiment, Mn is set to 3.0% or more,
Forms an austenite-forming element and contributes to weakening the tendency to transform into martensite by cold working.

(Example 2) A flat plate of austenitic stainless steel having the following chemical components was cold-worked to form a shank 6 for leather shoes having a conventionally known shape and dimensions.
Was made. The chemical components in steel are as follows: C is 0.07%, Si
Is 0.53%, Mn is 9.85%, P is 0.020%,
0.000% of S, 5.62% of Ni, 18.0% of Cr
8% and N is 0.298%. The shank has a thickness of about 1.20 mm, a width of about 12.0 mm, a total length of about 110.0 mm, and a weight of about 10 g, as in the first embodiment.

The shank of Example 2 was subjected to a needle test function test and was found to be equivalent to 1.4 mmφ in terms of iron balls. Therefore, the B-sensitivity of the needle detector (manufactured by Sanko Electronics Research Laboratories) used for the clothing could be cleared without any problem.

By the way, at the time of the needle meter function test, the chemical components of C were 0.07 to 0.10% and Si was 1.10%.
0% or less, Mn is 9.0 to 10.0%, and Ni is 5.
0 to 6.0%, Cr is 17.5 to 18.5%,
Several types of shank with N varied in the range of 0.25 to 0.35% were prototyped, and each of them was subjected to a test, and all of them were found to be 1.7 mmφ or less in terms of iron ball.

Also in this example, compared with the conventional SUS series, Mn is contained at a high content of 9.0% or more.
It is recognized that Mn forms an austenite forming element and contributes to weakening the tendency to transform into martensite by cold working.

Embodiment 3 Austenitic stainless steel round wire having a chemical composition within the same range as that of Embodiment 2 is cold-worked to form a fixing nail 4 and a fixing nail 4 having a conventionally known shape and size. An embedding nail 9 was produced. Then, the set of eight fixed nails and three embedded nails was subjected to a needle detector function test, and as a result, it was recognized that the iron ball equivalent was 0.6 mmφ or less as a whole.

As described in the above embodiment, according to the result of the needle meter function test, the number of the shank 6 is 1.7 mmφ or less in terms of iron ball, and the number of the fixed nails 4 and the number of the embedded nails 9 are the same as the set number. In the state, it is 0.6 mmφ or less in terms of iron ball.

Therefore, by combining the single shank of the first embodiment or the second embodiment with the set of the fixed nails and the embedded nails of the third embodiment, the meter reading made by Sanko Electronics Laboratory Co., Ltd. is made as a whole. When passed through a container, it is equivalent to an iron ball.
The B sensitivity equivalent to 5 mmφ was successfully cleared.

On the other hand, a temporary nail, which has been conventionally used, is added to the set of one shank of the embodiment 1 or 2 and the number of fixed nails and embedded nails of the third embodiment. When these were passed as a whole through a needle detector manufactured by Sanko Electronic Laboratory Co., Ltd., an abnormal signal was generated in the B sensitivity, and the presence of a temporary nail was detected.

(Example 4) A flat plate of titanium was cold-worked to produce a shank 6 for a shoe similar to a conventionally known shape and size. The shank is about 1.20mm thick,
About 12.0mm in width, about 110.0mm in total length, about 4.5g in weight
It is.

The shank of Example 4 was subjected to a needle test function test and found to be equivalent to 1.7 mmφ in terms of iron ball. Therefore, the B sensitivity of the above-described needle detector (manufactured by Sanko Electronics Research Laboratory) was successfully cleared.

Although the embodiments have been described above, it is needless to say that the present invention is not limited to the above embodiments. In particular, it is clear that the present invention can be applied not only to the above-mentioned men's leather shoes, but also to women's leather shoes and the like. The present invention can be widely applied to footwear such as certain shoes, cloth shoes, and sandals which may cause a danger due to remaining broken pieces of sewing needles as well as clothing.

Further, in the above embodiment, the most preferable materials of the metal component are exemplified by non-magnetized austenitic stainless steel and titanium, but they are non-magnetic enough to achieve the above object. In addition, other metal materials can be selected as long as they have toughness.

Further, in the above-described embodiment, metal components such as nails and shank included in leather shoes are exemplified. However, the present invention is not limited to these, and rings attached to shoes, It can be implemented for various metal components included in footwear.

[0055]

According to the present invention, the metal component contained in the footwear has toughness and thus fulfills the essential function required of the metal component, while it is non-magnetic, so that it has the same function as a needle detector. By using the magnetic detection means based on the principle, it is possible to efficiently detect whether dangerous metal fragments generated during the manufacturing process of footwear remain, such as forgetting to remove temporary nails and remaining broken pieces of sewing needles. The effect is that it becomes possible.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

[Explanation of symbols]

 4 fixed nail 6 shank 9 embedded nail

Claims (3)

(57) [Claims] 1. A metal component included in footwear, comprising a metal material having toughness and non-magnetism. 2. A metal component included in footwear, which is made of austenitic stainless steel, especially non-magnetized stainless steel. 3. A metal component included in footwear, which is made of titanium.