JP2013078612A - Sole or shoe having the sole on bottom face thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip resistant sole or a shoe having the slip resistant sole on the bottom face thereof which allows easy and sure confirmation of when the slip resistant shoe should be replaced.SOLUTION: In the slip resistant sole 1 including a midsole 20 having cushioning properties provided on the upper bottom of an outsole 10 having a ground contact surface, a plurality of concave-convex shaped grip designs are protruded on the ground contact surface of the outsole 10. At least one synthetic resin visible material 50 is laminated between the upper bottom of the outsole 10 and the lower bottom of the midsole 20 so that it is exposed when the outsole 10 is worn by a predetermined amount (u). The upper bottom of the outsole 10 on which the resin visible material 50 is laminated is formed with a recessed part shallower than the lower bottom of the outsole 10 when viewed from the upper bottom of the outsole 10. The resin visible material 50 is laminated on the recessed part while biting into both the outsole 10 and the midsole 20.

Description

  The present invention relates to a slip-resistant shoe sole having a midsole having a cushioning property softer than the outsole on an upper sole of the outsole having a ground contact surface, and the shoe has the shoe sole or the shoe sole on the bottom surface. .

  Conventionally, in places where water and oil are splashed on the ground surface of food processing plants, and in places where there is a danger to the feet of construction sites, manufacturing industries that handle heavy machinery and parts, fisheries, and forestry The most common foot injury accident is an arm or lower back injury caused by a fall on site. In order to prevent such accidents, JIS T8101 safety shoes were developed for the purpose of protecting the feet of workers, and JPSA standard protective sneakers (among these two standards) A shoe that satisfies any one of the criteria is hereinafter referred to as a “shoe”).

  Conventional shoe soles and shoes considering slip resistance are disclosed in, for example, Patent Document 1.

Utility Model Registration No. 2567956

Note that safety shoes are defined in the JIS standard as “shoes that mainly protect the toes of the wearer with a tip and have anti-slip”. And it is stipulated that cowhide or rubber is used as the material of the upper of the safety shoes.
Protective sneakers, on the other hand, are shoes that have a safety function that protects the feet, just like safety shoes, but they use artificial leather or vinyl leather cloth for the upper, making it mandatory to use cowhide materials. It is not subject to JIS standards for "safety shoes". Instead, there are many designs that cannot be expressed with leather products, and the performance is improved by using various materials such as meshes and other materials that are difficult to sag and reflectors. In addition, products with excellent slip resistance and those with electrostatic functions have been developed, and safety aspects are also considered.

  In recent years, with the increase in imports of sneaker-type shoes equipped with foreign-made toescores, sneakers that claim safety performance are misunderstood as JIS-standard products for safety shoes. There are many products that have been damaged, and products that have problems with safety performance and durability. Therefore, it is necessary to clear a certain standard according to the JIS standard for these products, so the Japan Protective Sneakers Association (JPSA) was established and a group standard (JPSA standard) according to the JIS standard was established. It was. As a result of the public test, a certified product that satisfies the JPSA standard is a product that has been certified by the Japan Safety Products Association for the safety performance of the toes equivalent to the JIS standard, and is a highly reliable product.

  In 2006, the Japan Safety Shoe Industry Association revised the safety shoe JIS standard to establish a new test method and standard value for “slip resistance” as additional performance required for safety shoes. Specifically, it was established that a safety shoe with slip resistance should have a performance coefficient of a dynamic friction of a shoe sole of 0.20 or more when tested by a test method stipulated in JIS.

  Accordingly, the JPSA standard protective sneaker, which is a standard conforming to the above JIS standard, has similarly established a new test method and standard value for “slip resistance” with the revision of the additional performance of the JIS standard.

  However, even if one of the above two safety standards establishes a standard for “slip resistance,” the soles will wear due to the fact that the same shoe is worn for a long period of time in the field. The slip resistance is reduced, and the original function as slip resistance is impaired. As a result of continuing to wear shoes in which the slip resistance is lost, there is a risk of slipping and falling, resulting in injury. Nevertheless, even if the soles were worn, the standards for changing shoes were vague and largely based on individual judgment. In addition, even when developing shoes, there was no official standard for how much wear was actually less than the standard for slip resistance as a shoe, and for supporting or confirming the test method. .

  The present invention has been proposed in view of the above points, and provides a shoe sole that can easily and reliably confirm when a shoe having slip resistance should be replaced, or a shoe having the shoe sole on the bottom surface. It is for the purpose.

  In order to solve the above-described problems, the present invention provides a slip-resistant shoe sole including a midsole having a cushioning property softer than the outsole on an upper sole of the outsole having a grounding surface, A plurality of concavo-convex grip designs protrude from the ground contact surface, and are made of a synthetic resin that is exposed when the outsole is worn a predetermined amount between the upper bottom of the outsole and the lower bottom of the midsole. At least one visual recognition material is laminated, and a concave portion shallower than the lower bottom of the outsole is formed on the upper bottom of the outsole on which the visual recognition material is laminated, It is a shoe sole characterized in that the visual recognition material is laminated in a recessed portion in a state where both of the outsole and the midsole are difficult to enter. Further, the shoe has a shoe sole having such characteristics on the bottom surface.

The present invention can produce the following effects. Specifically, the bottom sole of the outsole (the back side of the shoe sole) usually has a protruding grip design made of foamed polyurethane, which retains a certain amount of adsorption force against the grounding surface and further enhances slip resistance. However, the visual recognition material according to the present invention is exposed when the grip design of the shoe sole disappears or when the outsole is worn out. Even if the outsole wears and the visual recognition material begins to be exposed, the outsole is “hard” to some extent and therefore does not wear immediately. Therefore, even if the visual recognition material starts to wear, it seems that the exposed area of the visual recognition material gradually expands. When the visual recognition material starts to be exposed, in other words, when the visual recognition material starts to appear, “the slip resistance decreases. As a warning message “Be alert, since it has started,” it is possible to provide an effect of warning the wearer so that the wearer can perceive and recognize that the quality of the shoes is gradually decreasing.
When the visual recognition material is completely exposed, it is in an excessively worn state, and the dynamic friction coefficient of the shoe sole of the shoe is less than the specified value 0.20 of the slip resistance defined by the JIS standard or the JPSA standard. It can be determined that the performance has deteriorated. In such a case, there is a risk of falling, and it is necessary to change shoes, and the information can be perceived by the wearer.
From the above, regarding the slip resistance of shoes, the visual confirmation material according to the present embodiment is merely a “standard for slip resistance”, and the wear resistance is reduced when the outsole wears and the visual recognition material starts to be exposed. A person can be warned, and it is possible to visually judge the replacement time of the shoes. In this way, it is possible to notify the wearer that it is time to replace the shoes by using the visual recognition material with the change in appearance as a visual clue. A shoe having slip resistance conforming to the JIS standard or JPSA standard can be made into a product, and a third party can be urged to replace the shoe when the slip resistance is deteriorated.

In the safety shoes concerning this embodiment, it is an important section longitudinal section with a visual recognition material interposed. It is the elements on larger scale of the part enclosed with the dashed-two dotted line of FIG. 1, and is a partial sectional view which shows that the visual recognition material is laminated | stacked in the state which penetrated in both the outsole and the mid sole. FIG. 3 is a partial cross-sectional view showing a state in which the outsole is worn by a predetermined amount and one surface of the visual recognition material is exposed in the state of FIG. 2. It is the sole figure which showed the location where weight spreads and spreads on the sole of a person's foot. It is a back view in the state where a wearer wore safety shoes concerning this embodiment. In the safety shoes which concern on other embodiment, it is the back view which interposed the visual recognition material. It is AA principal part sectional drawing of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiment, the case of the safety shoe 100 conforming to the JIS standard will be described.

<1. Regarding the structure of safety shoes according to an example of the present embodiment>
<1.1. About sole (sole) 1 and upper (top) 2>
The structure of the safety shoe 100 can be roughly divided into a shoe sole 1 and an upper 2.
The shoe sole 1 is a base portion that supports the insole 30, the midsole 20, and the wearer's foot 5 (see FIG. 4). is there.
A shoe sole 1 according to this embodiment is formed as a two-layer sole (double sole), and is used for a safety shoe 100 as shown in a longitudinal sectional view of a main part of FIG. FIG. 1 is a longitudinal sectional view of an essential part of the safety shoe 100 according to the present embodiment, with visual recognition materials 50a, 50b, and 50c (generally referred to as 50) interposed.
The basic structure of the sole 1 of the safety shoe 100 according to the present embodiment is an upper sole 10a of an outsole (shoe sole grounding portion) 10 that has a ground contact surface and is formed into a shoe sole shape having an anti-slip effect. In addition, it has a two-layer bottom structure including a midsole 20 serving as an intermediate layer having a soft cushioning property that is more flexible and elastic than the outsole 10. Due to the two-layer bottom structure, the excellent shock absorption of the midsole 20 reduces the burden on the foot and reduces fatigue.
In addition, the material used for the safety shoes 100 and the type and structure of the shoes are made of durable materials that clear the standards of each company in addition to the performance defined in the JIS T8101 standard.
The upper 2 is an upper portion of the shoe 100 excluding the sole 1, and the midsole 20 is joined to the bottom of the upper 2. The upper 2 protects the foot 5 from external weather changes and impacts, and has a role to keep the foot in close contact so that the foot does not dance during walking. In addition, the upper 2 of the safety boot 100 according to the present embodiment uses a cowhide material.
Further, the safety shoe 100 provided with the shoe sole 10 of the present embodiment corresponds to the upper 2 in which the upper surface of the midsole 20 is joined to the bottom surface and covers the entire foot, and the tip of the upper 2, that is, the toe of the foot. And a tip 40 that fits into the area to protect the toes. Further, a steel shank is joined to the bottom surface of the upper 2 to support the arch portion of the foot and facilitate walking.

<1.2. Outsole 10 and midsole 20: For foam>
In the present embodiment, the outsole 10 and / or the midsole 20 has a structure of rubber, a synthetic resin foam, or a combination of these layers. In the present embodiment, both the outsole 10 and the midsole 20 are made of synthetic resin. It is molded from the body. The synthetic resin foam according to the present embodiment is a polyurethane foam that is a polyurethane resin (PU) foam, and examples of the polyurethane foam include those obtained by foaming and crosslinking a mixture of a polyol component and an isocyanate component.

The outsole 10 is formed of a high-density foamed polyurethane excellent in wear resistance and slip resistance, that is, a hard urethane foam that is expected to have sufficient strength as the sole 1 of the so-called safety shoe 100. On the other hand, the midsole 20 is a low-density foamed polyurethane excellent in cushioning properties compared to the outsole 10, that is, a composition having a high foaming rate (a large space and low density), so-called sufficient impact. It is made of a soft urethane foam that is sufficiently soft to exhibit absorbency.
Therefore, the two-layer structure of the shoe sole 1 according to the present embodiment is a structure in which a midsole 20 made of relatively soft, soft urethane foam is overlaid on the upper sole 10a of the hard foam urethane outsole 10. ing.
Although both the outsole 10 and the midsole 20 are different in hardness and softness, both are out of foam, so that the physical properties are familiar and the two are bonded by self-adhesion by foaming. Therefore, the possibility that the midsole 20 may be unexpectedly peeled off from the outsole 10 can be greatly reduced.
Moreover, as foams other than PU, it is also possible to form with the foam of an ethylene vinyl acetate copolymer resin (ethylene vinyl acetate: EVA) and a vinyl chloride resin, for example.

  However, it is preferable that the outsole 10 is hardly foamed because it is easily worn when foamed. In addition to the above materials, rubber, polyurethane, polyvinyl chloride, thermoplastic elastomer, and EVA can be used as materials for the outsole 10 of the safety shoe 100. However, oil is present on the ground surface, and slip resistance is particularly required. The material of the outsole 10 of the safety shoe 100 in the case where it is often used in a certain environment is synthetic rubber and PU.

<1.3. Outsole 10 and midsole 20: rubber>
Further, when the material of the outsole 10 and the midsole 20 is rubber, it is a polymer compound that exhibits rubber-like elasticity by vulcanization or crosslinking, and natural rubber or synthetic rubber is used.
The rubber used as the material of the outsole 10 and the midsole 20 is a rubber for a shoe sole, and is a synthetic rubber such as styrene-butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), and special synthetic rubber. Examples thereof include, but are not limited to, acrylonitrile / butadiene rubber (NBR), butadiene / acrylonitrile / acrylate terpolymer, and butadiene / acrylonitrile / isoprene terpolymer. These rubbers may be used alone or in a blend. In this case, the outsole 10 and the midsole 20 are bonded by an adhesive.
In view of weight reduction and cushioning properties of the safety shoe 100, the midsole 20 is preferably made of a foam. This is because the excellent shock absorption by the foam reduces the burden on the foot and reduces fatigue.

<1.4. About the thickness s in the vertical direction of the midsole 20>
Further, the thickness s in the vertical direction of the midsole 20 in the present embodiment is about 4 to 20 mm. Since the midsole 20 has a sufficient cushioning property and is lightweight by sufficiently taking the thickness s in the vertical direction, there is little fatigue even when walking for a long time while wearing the safety shoes 100 according to this embodiment. As can be seen from the wide distribution range of the thickness s of the midsole 20, the shoe sole 1 including the midsole 20 and the outsole 10 according to the present embodiment has a heel region 95 as shown in FIG. Has a heel-like structure as compared to the toe portion region 60 and the midway region 90. The safety shoe 100 according to the present embodiment assumes a case where the height of the heel 12 is a standard heel, but the present invention can also be applied to a case of a heel having another height. The cut design of the heel rear end portion has the effect of smoothing the landing of the heel 12, stabilizing the walking, and assisting the operation of lifting the foot 5 during walking.

<1.5. Regarding the thickness t of the outsole 10 in the vertical direction>
The outsole 10 is generally formed with a thickness t of about 3 mm in the vertical direction. The lower sole 10b of the outsole 10 has a plurality of concave and convex grip designs 11 excellent in slip resistance and wear resistance, which reduces the impact of the concave and convex portions on the ground surface during walking and protects the soles of the feet. Play a role to do. In particular, the shape of the ground contact surface of the outsole 10 is a polygonal or circular independent grip design 11, which gathers to form a pattern of the entire shoe sole 1, and the grip design 11 is not easily depressed, and It is desirable to have a strength that does not easily fall over.

<1.6. Insole 30>
In addition, as the insole 30 to be bonded to the upper bottom of the midsole 20, a fiber board insole formed by compression molding a synthetic material or a non-fabric insole using a high-performance chemical fiber nonwoven fabric is used. In both cases, a material that stands out in terms of wear resistance and flex resistance, and is excellent in soft foot contact, sweat absorption, and moisture release is preferable. The insole 30 constitutes the frame of the shoe 100 and is a support that firmly supports the weight during walking, and the insole cushion material can be thickened to further improve the cushioning property of the shoe sole 1. .

<1.7. Tip 40>
In addition, a toe portion of the upper 2 of the safety shoe 100 is provided with a tough carbon tool steel tip 40 for the purpose of ensuring the safety of the toe. There are two types of steel tip: interior type and exterior type. There is also a resin tip that is lightweight and has the same performance as a steel tip. Both have performances conforming to JIS standards.

<2. About the visual recognition material that is a feature of the present embodiment>
Next, the visual recognition material 50 that is a feature of the present embodiment will be described below with reference to FIGS. FIG. 2 is a partially enlarged view of a portion surrounded by a two-dot chain line in FIG. 1, and a part showing that the visual recognition material 50 is stacked in a state where a predetermined amount is inserted into both the outsole 10 and the midsole 20. FIG. 3 is a partial cross-sectional view showing a state in which the outsole 10 is worn by a predetermined amount u1 and u2 to expose one surface 50d1 and 50d2 of the visual recognition material 50c in the state of FIG. . FIG. 4 is a sole view showing the portions 5a, 5b, and 5c where the weight is dispersed and hung on the sole of the human foot 5. FIG. FIG. 5 is a rear view of the wearer wearing the safety shoes 100 according to the present embodiment.

<2.1. About the visual recognition material 50 according to the present embodiment>
The visual recognition material 50 according to this embodiment is a state in which the slip resistance of the safety shoe 100 is less than the dynamic friction coefficient of the sole 1 defined by the JIS standard due to wear caused by the wearer's safety shoe 100 being worn for a long time. It is a member for recognizing that it is in a slippery state, and a member having a discriminating power that allows the wearer to visually recognize that it is time to replace the safety shoes 100.

<2.2. Visual material 50 is laminated between outsole 10 and midsole 20>
Therefore, at least one visual recognition member 50 according to the present embodiment is laminated between the upper bottom 10 a of the outsole 10 and the lower bottom 20 b of the midsole 20. As shown in FIG. 1 and FIG. 2, the visual recognition material 50 is in a state of being inserted into both the outsole 10 and the midsole 20 by a predetermined amount, and the outsole 10 is a predetermined amount u1 in the vertical direction and a predetermined amount in the front-rear direction. Each surface 50d1 and 50d2 of the visual recognition material 50 is exposed by the u2 wear (hereinafter, a general term for a predetermined amount of wear of the outsole 10 is u, and a predetermined amount u is worn. The generic name of one surface of the visual recognition material 50 exposed in this way is 50d). Specifically, the lower sole 10b of the outsole 10 is usually a protruding grip design 11 made of a plurality of foamed polyurethanes, and has a certain degree of adsorption force with respect to the ground surface to further enhance the slip resistance. The visual recognition material 50 is configured to be exposed when one grip design 11 is lost or when the outsole 10 is worn out.
A concave portion shallower than the lower bottom 10 b of the outsole 10 when viewed from the upper bottom of the outsole 10 is formed on the upper bottom of the outsole 10 on which the visual recognition material 50 is laminated, and the visual recognition material 50 is formed in the concave portion. Are stacked. Thus, even when the visual recognition material 50 is laminated on the recessed portion, the thickness t in the vertical direction of the outsole 10 is set to be uniform.

<2.3. Degree of wear of visual recognition material 50>
The visual recognition material 50 is formed from a synthetic resin, and in this embodiment, is formed from a vinyl chloride resin. The degree of wear of the visual recognition material 50, that is, the ease of wear, is set to be equivalent to that of the outsole 10 which is a foam of hard urethane that is hardly foamed, and the color of the visual recognition material 50 is different from that of the outsole 10. Set to color. In addition, it is desirable to change the composition and mix the paint and the dye so that the visual difference from the outsole 10 becomes clear depending on the color or gloss.
The color of the visual recognition material 50 may be a single color or a color in which a plurality of colors are mixed, or may be a pattern having characteristics sufficient to identify that the visual recognition material 50 is exposed by wearing the outsole 10 to the limit. If it is a conspicuous color, pattern, or shape such as a fluorescent color, it is confirmed that when the wearer walks, the outsole 10 of the safety shoe 100 worn by the wearer reaches the wear limit and the visual recognition material 50 is exposed. It is also possible for a third party to recognize and teach the wearer.
Here, “the wear degree of the visual recognition material 50 is set to be equal to that of the outsole 10” means that the visual recognition material 50c is worn out by a predetermined amount u1, u2 as shown in FIG. If one surface 50d1, 50d2 is exposed and the wearer is not aware that the visual recognition material 50c is exposed at that stage, the exposed visual recognition material 50c and the remaining outsole 10 are not materials that wear simultaneously. The soft midsole 20 may be worn out, or the outsole 10 may be worn first and only the visual recognition material 50c may be popped out to cause a secondary disaster.

  In the above-described embodiment, the visual recognition material 50c is described, but the visual recognition materials 50a and 50b are similarly worn on the bottom of the outsole 10 and the grip design 11 by a predetermined amount u, and one surface of each visual recognition material 50a and 50b. 50d is exposed.

<2.4. About “Color”>
In addition, even if simply referred to as “color”, here are three types of sensory attributes used to describe the color: three attributes of color such as hue (hue), lightness (brightness), and saturation (brightness) It is used as a general term. Note that white, gray, and black gray scales are distinguished by lightness and do not include hue and have zero saturation. Such a color is called an achromatic color, and colors other than grayscale are chromatic colors having all three attributes. In practice, however, even white, black, and gray usually show some saturation, so it is inappropriate to make so-called white, black, and gray colors that have only one of the three attributes of color. .
From the above, it is preferable that any one of hue, brightness, and saturation is set so that the outsole 10 and the visual recognition material 50 are different.

<2.5. The form in which the visual recognition material 50 has discriminating power changes as the wear of the outsole 10 progresses>
Moreover, the visual recognition material 50 can also be configured such that the shape, pattern, and color of the visual recognition material 50 having discriminating power change as the wear of the outsole 10 progresses. is there. That is, as the outsole 10 wears, the wear area of the outsole 10 increases, and the exposed area of the visual recognition material 50 gradually increases. Furthermore, when the exposed area of the visual recognition material 50 increases gradually as the wear of the outsole 10 progresses, the visual recognition material 50 starts to be worn simultaneously with the outsole 10, and accordingly the visual recognition material 50 having discriminating power. It is also possible to configure the shape, pattern, and color form to change stepwise. That is, a plurality of types of shapes, patterns, and colors are stacked so that the shape, pattern, and color of the visual recognition material 50 change stepwise as the wear of the visual recognition material 50 progresses. For example, it is possible to configure so that the color of the visual recognition material 50 changes to a warning color step by step as the wear progresses. This causes the wearer to perceive the progress of wear by the form change of the visual recognition material 50, and has an effect that the period until the use limit of the safety shoes 100 is reached can be predicted in advance. It is.

  Further, since the slip resistance varies depending on the material forming the sole 1 and the shape of the outsole 10, the predetermined amount u of the outsole that exposes the visual recognition material 50 depends on the slip resistance of each sole 1. Can be set as appropriate. The user can perceive the use limit of the shoe sole 1 by matching the exposure of the visual recognition material 50 with the use limit of the shoe sole 1 due to wear.

<2.5. Hardness of visual recognition material 50>
Moreover, the hardness of the visual recognition material 50 is set to be equal to that of the outsole 10 so that even if the wearer wears the safety shoes 100 according to the present embodiment, the wearer does not feel a foreign object. A shape and an arrangement position are set in the shoe sole 1. The specific shape and arrangement position of the visual recognition material 50 will be described later.

  If the visual recognition material 50 has a higher hardness than the outsole 10, the outsole 10 is damaged because it is always sandwiched between the ground contact surface and the visual recognition material 50 during walking, and the wear of the outsole 10 is promoted. It will be. Therefore, the hardness of the visual recognition material 50 and the outsole 10 is preferably set to be equal, or at least the visual recognition material 50 is preferably set to be softer than the outsole 10.

<3. About the specific arrangement position of the visual recognition material concerning this embodiment>
<3.1. Mother Ryukyu Part 5a, Small Ryukyu Part 5b, Saddle Part 5c>
Next, when the wearer wears the safety shoes 100, which region of the shoe sole 1 will receive weight will be described, and the arrangement of the visual recognition material 50 according to the present embodiment in the region will be described below with reference to FIG. And it demonstrates based on FIG.
In general, when a person stands on both feet 5 and 5 or walks normally, the back of the foot 5 is used equally on the left and right. At least when standing on both feet 5 and 5, the feet 5 and 5 should be evenly weighted. At this time, as shown in FIG. 4, the well-balanced standing and walking methods are the base ball part 5a (corresponding to the bulging part of the base of the big toe), the small ball part as shown in FIG. 5b (corresponding to the bulging part of the base of the little toe of the foot), refers to a state where the weight is placed on the heel part 5c in a balanced manner. Therefore, there are mainly three areas where the weight is applied to the sole 1 of the safety shoe 100 during walking, that is, the part is easily worn.

<3.2. Outer base 10 baseball region 70, small baseball region 80, buttocks region 95>
From the above, the outsole 10 corresponds to the parts of the base ball part 5a, the small ball part 5b, and the hook part 5c on the back surface of the wearer's foot 5, corresponding to the base ball part region 70 and the small ball part region. 80, and the visual recognition material 50 is disposed in a region corresponding to at least one of the base ball portion region 70, the small ball portion region 80, and the hook region 95 (hereinafter referred to as the mother portion). The visual recognition material 50a in the Ryukyu portion region 70, the visual recognition material 50b in the small ball portion region 80, and the visual recognition material 50c in the hip region 95 are referred to as the visual recognition material 50 as a generic term of the visual recognition materials 50a, 50b, and 50c).
With such a configuration, the visual observation material 50 is provided in the main ball portion region 70, the small ball portion region 80, and the hip portion region 95, so that the wear progresses before the entire shoe sole 1 is worn. The wearer can perceive it.

It should be noted that the visual recognition material 50 arranged in the region corresponding to at least two of the main ball part region 70, the small ball part region 80, and the hip part region 95 depends on the progress of wear of the outsole 10. It is also possible to adopt a configuration in which the exposure is performed step by step from one region to the next region. For example, the visual recognition material 50 is disposed in two places, the main ball region 70 and the hip region 95. And by wearing the safety shoes 100 and wearing it for a long time, depending on the person, the hip region 95 is more easily worn than the base ball region 70, and the visual confirmation material 50c of the hip region 95 is exposed. By continuing to wear, the visual recognition material 50a of the base ball portion region 70 is exposed. When worn to this point, the function as the safety shoe 100 can no longer be expected, including the function of slip resistance, so it is necessary to replace it immediately. Thus, since the wear part of the shoe sole 1 is each person, the visual recognition material 50 can be exposed in steps by arranging the visual recognition material 50 in a plurality of places, and the safety shoe 100 is at the last minute. Can be used up to.
Of the above three regions, the region where the wearer's weight is the most is the buttocks region 95, so the wearability is often worn from the outsole 10 of the buttocks region 95 and the visual recognition material 50c is often exposed. However, even if the visual recognition material 50c in the buttock region 95 is exposed, the buttock region 95 does not directly affect the slip resistance because the area of the buttock region 95 that directly touches the ground contact surface is not so large. However, the fact that the visual recognition materials 50a and 50b of the outsole 10 in the main ball part region 70 and the small ball part region 80 are successively exposed means that the grip design 11 of the outsole 10 is not present. This means that the lower sole 10b of the shoe sole 1 is considerably worn and is in a considerably dangerous state.

  Each of the ball segments of the shoe sole 1 is attached to a visual recognition material 50 having a predetermined hardness and degree of wear in consideration of the region of the wearer's foot 5 where the ball 5b, the small ball 5b, and the ball 5c contact each other. 70, the small heel part region 80, and the buttock region 95, the body weight can be dispersed in each of the mother heel part region 70, the small heel part region 80, and the buttock region 95. Rigidity is ensured and good slip resistance can be obtained. As a result, the progress of wear of the outsole 10 is slowed down, and the slip resistance of the safety shoe is a lower limit value that allows the user to feel that the dynamic friction coefficient of the outsole 10 is difficult to slip for a long period of time. The slip resistance and wear resistance of the sole 1 of the safety shoe 100 can be maintained for a long period of time compared to the conventional case, and can be strongly improved.

<4. About the shape of the visual recognition material>
Next, the shape of the visual recognition material 50, in particular, the shape of the visual recognition material 50c in the buttocks region 95 will be described.
The rear end portion of the safety shoe 100, that is, the buttocks region 95, is a region where the weight of the wearer of the safety shoe 100 is the most. In other words, it is also a region where the load of the wearer is applied in the entire region of the sole 1 of the safety shoe 100, and the visual recognition material 50 according to the present embodiment has a predetermined hardness. In the region 95, it is necessary to pay attention to the shape of the visual recognition material 50c.
Therefore, when the wearer wears the safety shoes 100, the shape of the visual recognition material 50c in the buttocks region 95 is such that it does not hit the wearer's buttocks 5c as much as possible (so as not to make the wearer feel a foreign object). It is preferably formed in a substantially L shape in cross-sectional view, and as shown in FIG. 1 to FIG. 3, it is a shape that feels like the L-shaped portion of the visual recognition material 50c wraps the wearer's buttocks 5c. Accordingly, the substantially L-shaped visual recognition material 50c can support the wearer's buttocks 5c to increase the sense of stability during wearing and improve the comfort of the safety shoe 100, and can also cause deformation and partial deformation of the shoe sole 1. Abrasion can be prevented and good slip resistance can be maintained. Accordingly, in the structure of the shoe sole 1, the rear end portion of the midsole 20 is set to a structure including the heel portion 5c.
Further, as shown in FIG. 5, the shape of the bottom view of the visual recognition material 50c in the buttocks region 95 is an arc shape along the outer periphery of the buttocks region 95 of the outsole 10, and at least one along the arc. Two or more visual recognition members 50c are arranged.

  Furthermore, since the entire heel region 95 of the shoe sole 1 is thicker in the vertical direction than the other regions, the cushioning property of the midsole 20 occupying most of the volume is of course not a problem, Although there is a concern that the thickness of the outsole 10 that supports it is felt as if the thickness in the vertical direction is thin, the stability is impaired, but the outsole 10 is a hard urethane having a certain degree of strength, and is equivalent to the region 95. Since one or more visual recognition materials 50c having hardness and wear degree are provided, the sense of stability in the buttock region 95 is firm compared to the conventional case.

<5. Effect>
With the configuration as described above, the shoe sole according to the present invention and the shoe 100 (safety shoe in the present embodiment) using the shoe sole 1 can obtain the following effects.
Usually, the lower sole 10b of the outsole 10 is a protruding grip design 11 made of a plurality of foamed polyurethanes, and has a certain amount of adsorbing force on the ground surface to further enhance the slip resistance. The visual recognition material 50 is exposed when the design 11 is lost or when the outsole 10 is worn out. Even if the outsole 10 is worn and the visual recognition material 50 starts to be exposed, the outsole 10 is “hard” to some extent, and thus cannot be worn out immediately. Therefore, even if the outsole 10 starts to be worn, it is a feeling that the area where the visual recognition material 50 is exposed gradually increases. When the visual recognition material 50 starts to be exposed, in other words, the visual recognition material 50 starts to be visible. Then, it is possible to provide an effect of warning the wearer so that the wearer can perceive and recognize that the quality of the safety shoes 100 is gradually deteriorated as a warning message “Please be wary because slip resistance is beginning to drop”. . Further, since the visual recognition material 50 has the same degree of wear and hardness as the outsole 10, it does not wear immediately. The fact that it does not wear immediately means that it still has slip resistance and is difficult to slip. In addition, the wear speed is the same, and there is little possibility of liquid such as water penetrating into the safety shoe 100.
In addition, when the visual recognition material 50 is completely exposed, it is in an excessive wear state, and the dynamic friction coefficient of the sole 1 of the safety shoe 100 is less than the specified value 0.20 of the slip resistance defined by the JIS standard. It can be determined that the slip resistance has deteriorated. In such a case, there is a risk of falling, and it is necessary to replace the safety shoes 100, and the information can be perceived by the wearer.
From the above, regarding the slip resistance of the safety shoe 100, the visual recognition material 50 according to the present embodiment is merely a “standard for slip resistance”, and when the outsole 10 is worn out and the visual recognition material 50 starts to be exposed, the slip resistance decreases. The wearer can be warned that the safety shoes 100 are to be replaced, and the replacement time of the safety shoes 100 can be visually determined. As described above, the visual change 50 can be used as a visual clue to notify the wearer that it is time to replace the safety shoes 100. Safety shoes 100 having slip resistance in accordance with JIS standards can be used as a product, and a third party can be encouraged to replace when the slip resistance is deteriorated.

  Moreover, even if the movement of the load in the front-rear direction and the left-right direction during walking occurs due to the shape of the ground contact surface, the visual confirmation materials 50a and 50b of the main ball region 70, the small ball region 80, and the hip region 95 are obtained. When 50c is not exposed, it exhibits extremely high slip resistance, and even if it is wet with water or oil and the weight of the body in the forward / backward and left / right directions during walking is caused by the shape of the ground contact surface The shoe sole 1 having high slip resistance effectively contacts the ground surface and can exhibit high slip resistance.

  In addition, since the visual recognition material 50 should just function as a means for having the said effect, it functions as a means for notifying that the safety shoes 100 are worn out, and grasping | ascertaining the replacement time of the safety shoes 100. As long as this is done, it is preferable that the thickness and shape of the visual recognition material 50 be made in accordance with the wearer's workability and work content. This is because a certain amount of thickness is required from when the outsole 10 starts to be exposed due to wear until it is completely exposed. That is, the visual recognition material 50 is in a state where it is inserted into both the outsole 10 and the midsole 20 by a predetermined amount, and one surface 50d of the visual recognition material 50 is exposed when the outsole is worn by a predetermined amount u. ing. Therefore, the visual recognition material 50 is a slip sign exposed by the wear of the outsole 10, and remains without falling out even if the outsole 10 is completely worn down. For example, the thickness in the vertical direction of the visual recognition material 50 according to this embodiment is about 3 mm.

  Further, the way the shoe sole 1 is worn is not uniform because each person has wrinkles. However, in many cases, one of the three regions (the main ball region 70, the small ball region 80, and the hip region 95) is worn ahead. Therefore, the shoes 100 with the notice visual recognition material 50 suitable for most wearers can be provided by arranging the visual recognition material 50 in all or part of the three regions.

<6. Other embodiments>
The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the technical scope of the present invention.

In the above-described embodiment, the visual recognition material visual recognition materials 50a, 50b, and 50c are provided mainly in the baseball portion region 70, the small ball portion region 80, and the hip portion region 95 of the safety shoe 100. A location changes with wearers and the lamination | stacking location of the visual recognition material 50 is not limited to these area | regions. Depending on the person, more weight (weight) is applied to the baseball region 70 and the small baseball region 80 than the base region 95, or more than the baseball region 70 and the small baseball region 80. In some cases, more weight is applied to the buttock region 95, and the weight of the shoe wearer is the most on the sole 1 and the outsole 10 is easily worn by each person. It is. For example, the wear of the safety shoes 100 varies in various ways such as a wearer's wear type and a person who wears and wears his / her foot and walks. Therefore, the visual recognition member 50 in the present invention is only one means for warning and one of the standards regarding the slip resistance of the safety shoe 100.
In the present embodiment, the visual recognition material 50 is arranged at two locations, but it is preferable to arrange the visual recognition material 50 at a place where the wear is severe or a place where it becomes slippery when worn. It is also possible to prepare several arrangement patterns, and the wearer can select and purchase and use safety shoes 100 suitable for himself / herself.

  In another embodiment, as in the above-described embodiment, the visual recognition materials 50a and 50b are not provided in the main ball region 70 and the small ball region 80 (see FIG. 5), but both the regions 70 and 80 are provided. That is, in the vertical direction of the front portion of the elliptical grip design 13 that protrudes downward from the front center region 65 of the lower bottom 10b of the outsole 10 (the back surface of the shoe sole 1) and is arranged in the front-rear direction. On the opposite side, that is, in the region of the upper bottom 10a of the outsole 10, a recessed portion 13a is formed, and a visual recognition material 50e is laminated on the recessed portion 13a. That is, a configuration in which the visual recognition material 50e is included in the elliptical grip design 13 in the front center region 65 is also possible. On the other hand, in the collar region 95 of the upper bottom 10a of the outsole 10, the visual recognition material 50c is laminated on the concave portion 95a having a fan shape when viewed from above. The effect of the visual recognition materials 50c and 50e when the safety shoes 100 according to this embodiment are actually worn will be described with reference to FIGS. 6 is a back view of the safety shoe 100 according to another embodiment with the visual recognition materials 50c and 50e interposed therebetween, and FIG. 7 is a cross-sectional view of the main part AA in FIG.

6 and 7, a plurality of triangular shapes are provided as the grip design 11 on the lower bottom 10b of the outsole 10, but the front portion 55 of the lower bottom 10b of the outsole 10 and the heel portion 12 of the rear portion 92. , Recessed portions 13a and 95a of the upper bottom 10a of the outsole 10 are formed, and at least one viewing material 50c and 50e is provided there.
Unlike the hip region 95, the front central region 65 is different in weight from the grip design 11, 11 of the main ball region 70 and the small ball region 80 located on both sides of the central portion 65 than the grip design 13 of the central portion 65. When the grip design 13 of the central portion 65 is worn out, the grip designs 11 and 11 on both sides 70 and 80 are partially worn away so that the grip design 11 and 11 are not uneven. The bottom 10b of the sole 10 is worn until it is exposed, so that the sole 1 becomes almost flat and the slip resistance effect of the safety shoe 100 is considerably reduced. Before such a situation is prevented, a visual recognition material 50e is included in the grip design 13 of the front center region 65 so that the visual recognition material 50e is exposed by wear of the grip design 13.

  As described above, first, the visual recognition material 50c in the buttock region 95 is set to be exposed, and unlike the buttock region 95, the visual recognition material 50e is provided in the central portion 65 of the front region where it is difficult to apply weight. . With such a configuration, the visual recognition material 50c in the hip region 95 is the region where the weight is the most, so the visual recognition material 50c in the hip region 95 is exposed quickly, but the elliptical shape of the front central region 65 is formed. It is considered that the slip resistance of the shoe sole 1 is considerably reduced when the visual recognition material 50e provided in the recessed portion 13a of the grip design 13 is exposed. Thus, the visual recognition material 50e is provided in the recessed part 13a of the grip design 13 in the front center region 65 for the purpose of warning the wearer in two steps regarding the slip resistance of the sole 1.

  In addition, about providing the visual recognition material 50e and 50c in each recessed part 95a and 13a of the collar part area | region 95 and the front center area | region 65, attention is first urged by exposure of the visual recognition material 50c of the collar part area | region 95, and Although it is assumed that the warning is caused by the stepwise exposure of the visual recognition material 50 such as warning by the exposure of the visual recognition material 50e, there are various ways of wearing the shoe 100 depending on the person, and the method of reducing the sole 1 is different for each person. In other words, the visual recognition material 50c in the front region 65 is exposed, not the visual recognition material 50c in the front region 65, and then the visual recognition material 50c in the collar region 95 is exposed. It may be a pattern. Therefore, it is possible to produce an effect that the visual confirmation material 50 of the shoe sole 1 is exposed by being divided into a plurality of times, and the wearer is warned a plurality of times for each step.

  In order to prevent the nail from stepping out from the shoe sole 1, although not shown, a structure in which a stainless steel stepping-out prevention plate is laminated on the shoe sole 1 may be employed.

In the above-described embodiment, the safety shoes having the two-layer bottom structure have been described. However, the visual recognition material according to the present invention can be applied to the safety shoes having the single-layer structure and the safety shoes having the multilayer bottom.
For example, as one form of the bottom layer, an outsole having a contact portion with a grounding surface is formed as a single unit by injection molding or pressure molding using a molding die, and the outsole is bonded to the bottom surface of the upper There are some that form shoes by adhering using a.

  Further, at least one visual recognition member 50 in the present invention is laminated between the upper bottom 10a of the outsole 10 and the lower bottom 20b of the midsole 20. A plurality of visual recognition members 50 may be stacked in the vertical direction or the horizontal direction.

  In addition, as in the above-described embodiment, the present invention can be applied to a shoe that does not have the heel portion 12 and whose midsole 20 has a substantially equal thickness in the vertical direction over the length direction of the shoe.

  Moreover, in the said embodiment, although the safety shoes 100 based on the JIS standard which uses the cowhide material for the upper 2 were demonstrated, not the cowhide material but the artificial leather material and the vinyl leather cloth material are used for the upper. The visual recognition material which concerns on the said embodiment can be used also about the protective sneakers according to the JPSA standard. In this case, “safety shoes 100 compliant with JIS standard” described in the paragraph of the above embodiment is rewritten as “protective sneaker 100 compliant with JPSA standard”.

INDUSTRIAL APPLICABILITY The present invention can be used for shoe soles that exhibit extremely high slip resistance.
In addition, by using conductive rubber, cloth, and thread on the toe heel part, the antistatic shoes are designed to efficiently release the static electricity charged in the human body from the shoe sole and prevent the occurrence of sparks. (Electrostatic shoes) can also be used for electrostatic shoes having the performance of shoes.
In addition, safety shoes are worn on site, including general machinery / working / heavy work, construction / civil engineering and dismantling work, weight handling work, casting ceramic work, welding / melting work, oil / chemical handling work, and protective sneakers Can be used for cleaning work, building maintenance, transportation, food processing, leisure, horticulture, DIY.

DESCRIPTION OF SYMBOLS 1 Shoe sole 2 Upper 5 Feet 5a Mother heel part 5b Small heel part 5c Saddle part 10 Outsole 10a Upper base 10b Lower base t Thickness of the vertical direction u Predetermined wear amount of the outsole that exposes the visual recognition material 11 Grip design 12 Heel 13 Grip design 13a Recessed portion 20 Midsole 20b Lower bottom s Vertical thickness 30 Middle bottom 40 Tip core 50, 50a, 50b, 50c, 50e Visualizing material 50d One surface 55 Front portion 60 Toe portion region 65 Front center region 70 Mother Ryukyu Region 80 Small Ryukyu Region 90 Midway Region 92 Rear Part 95 Hump Region 95a Recessed Part 100 Safety Shoes, Protective Sneakers (Shoes)

Claims (7)

A slip-resistant shoe sole including a midsole having a cushioning property softer than the outsole on an upper sole of the outsole having a ground surface,
A plurality of concavo-convex grip designs protrude on the ground contact surface of the outsole,
Between the upper bottom of the outsole and the lower bottom of the midsole, at least one visual recognition material made of synthetic resin that is exposed when the outsole is worn by a predetermined amount is laminated,
A concave portion shallower than the bottom bottom of the outsole as viewed from the top bottom of the outsole is formed on the top bottom of the outsole on which the visual recognition material is stacked, and the visual recognition material is formed in the concave portion. A shoe sole characterized by being laminated in a state where both of the midsole is difficult to be folded. The outsole has a buttocks region corresponding to the buttocks on the back of the wearer's foot,
In a region corresponding to the buttocks region between an upper bottom of the outsole and a lower bottom of the midsole, a plurality of the visual recognition materials are laminated,
The plurality of visual recognition materials in the buttock region are arc-shaped along an outer periphery of the buttock of the outsole, and the plurality of visual recognition materials are provided along the arc. Shoe sole as described in.   3. The shoe sole according to claim 2, wherein at least one of the plurality of visual recognition materials in the buttock region has a substantially L shape in a cross-sectional view so as to wrap a wearer's buttock outer periphery.   The shoe sole according to claim 1, wherein a wear degree of the visual recognition material is set to be equal to that of the outsole.   The sole according to any one of claims 1 to 4, wherein a dynamic friction coefficient of the outsole is 0.20 or more. The outsole has a buttocks region corresponding to the buttocks on the back of the wearer's foot,
In the region corresponding to the buttocks region between the upper bottom of the outsole and the lower bottom of the midsole, at least one visual recognition material is laminated,
2. The shoe sole according to claim 1, wherein at least one of the visual recognition materials in the buttock region has a substantially L shape in cross-sectional view so as to wrap the outer periphery of the heel of the wearer.   A shoe having the sole of any one of claims 1 to 6 on its bottom surface.

Images