KR102555764B1 - Shoe soles, shoes and non-slip members - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a shoe outsole that can withstand not only immediately after starting to stand up with strength but also continues thereafter, and can exhibit excellent sliding resistance even when walking on a poor walking surface such as when walking on an ice surface.
In the present invention, the shoe sole has a coefficient of kinetic friction with respect to the ice surface greater than the maximum coefficient of static friction with respect to the ice surface. The coefficient of kinetic friction against the ice surface is preferably 0.25 or more. These conditions are, for example, a plurality of anti-slip protrusions whose lower surfaces serve as a ground contact surface are formed downward, a recessed portion formed in the shape of a bowl is formed on the lower surface of each anti-slip protrusion, and each concave portion This can be achieved by a shoe sole having an annular stepped portion on the inner circumferential surface.

Description

Shoe soles, shoes and non-slip members

The present invention relates to a shoe sole having excellent sliding resistance to ice, a shoe provided with the shoe sole, and an anti-slip member to which the shoe sole technology is applied.

As a shoe sole (slip resistance shoe sole) with improved sliding resistance, various types have been proposed so far.

For example, in Patent Literature 1, a shoe sole provided on the lower part of a shoe body and a sucker having an awl-shaped concave portion are provided, and a plurality of the suckers are provided on the shoe sole to integrate the sliding of the shoe sole. A preventive structure (claim 1 of the same document) is described. In Patent Document 2, the non-slip structure allows the sucker having adhesive power to grip the ground, and not only dry asphalt, soil, grass, etc., but also wet ground, snowy road, frozen ground, or ground covered with oily liquid. The contents by which the anti-slip effect is obtained (paragraph 0016 of the same document) are also described.

Further, in Patent Document 2, an anti-skid shoe sole having a plurality of ground convex portions formed on the ground contact side surface of the base portion at predetermined intervals in the longitudinal direction of the base portion, wherein each ground convex portion has a V-shaped cross section, and the base portion has a V-shaped cross section. An active shoe outsole (claim 1 of the same document) is described, characterized in that a slope reinforcement part is formed at the joint portion and at the same time, it is formed of an elastic polymer having a JIS-A hardness of 45 to 80 degrees at 20 ° C. there is. Patent Literature 2 also describes content that it is possible to walk stably even on a floor or the like in a slippery state due to the slip resistant shoe sole (paragraph 0021 of the same document).

Patent Document 1: Japanese Utility Model Registration No. 3096646 Patent Document 2: Japanese Patent Publication No. 2006-003740

However, it was not possible to say that conventional sliding-resistant shoe soles could always exhibit excellent sliding resistance. This is because the frictional force (frictional force received by the sole of the shoe from the walking surface, the same below) instantaneously reaches a peak immediately after the moment when you start to stand with force, such as the moment you start kicking the walking surface, and the frictional force after that. This is because it had a rapidly degrading characteristic. A wearer of shoes equipped with a shoe sole having such characteristics tends to unconsciously continue kicking the walking surface with strong force, mistaking that the slipping difficulty (frictional force) immediately after starting to stand with strength is maintained thereafter. Even in this case, there is little chance of slipping and falling when walking on a walking surface with good conditions, such as walking on a dry road surface, but there is a tendency to slip and fall easily when walking on a walking surface with bad conditions, such as walking on an icy surface.

The present invention has been made to solve the above problems, and can endure not only immediately after starting to stand with force but also after that, and exhibits excellent sliding resistance even when walking on a walking surface with poor conditions such as when walking on an ice surface. It is to provide a shoe sole that can be worn. It is also an object of the present invention to provide a shoe provided with this shoe sole. Furthermore, it is also an object of the present invention to provide an anti-slip member to which this shoe sole technology is applied.

The above problem is a shoe sole characterized in that the coefficient of kinetic friction with respect to the ice surface is greater than the maximum coefficient of static friction with respect to the ice surface (in this specification, unless otherwise specified, the lowermost part (outsole part) of the shoe sole is provided). It is called 'shoe sole'. ) is solved by providing

Here, the 'dynamic coefficient of friction on the ice surface' and the 'maximum coefficient of static friction on the ice surface' refer to the coefficient of friction measured by a measurement method based on ISO13287 'slip resistance test of shoe soles', and specifically, in the following steps Refers to the coefficient of friction measured by 1 to 6. However, the friction coefficient measurement is performed a total of 10 times, including the cycle of steps 1 to 6 below, and the average value of the maximum static friction coefficient obtained from the total of 5 measurements from the 6th to the 10th measurement and the dynamic friction coefficient The average values are adopted as the formal maximum static friction coefficient and dynamic friction coefficient, respectively.

<Step 1>

A shoe sole is installed on a horizontal ice surface (an ice surface maintained at 0°C and no water formed on the surface. This ice surface is supported in a horizontally slidable state by a force F ₂ described later). The sole of the shoe is kept in a state held by a jig or the like so as not to move in the horizontal direction.

<Step 2>

A vertically downward force F ₁ (500 N) is applied to the upper surface of the sole of the shoe, and the sole of the shoe is firmly pressed against the ice surface.

<Step 3>

While the force F ₁ of (2) above is continuously applied to the shoe sole, the force F ₂ in the horizontal direction is applied to the ice surface, and the force F ₂ is gradually increased.

<Step 4>

The force F ₂ from the start of applying the force F ₂ in step 3 until the start of the slide in the horizontal direction of the ice surface is measured, and the highest peak value (maximum value of the force F ₂ ) appearing during this time is the force The value divided by F ₁ is the 'maximum coefficient of static friction on the ice surface'.

<Step 5>

Increase the force _F2 until the speed at which the ice surface slides horizontally is 300 mm/s.

<Step 6>

Measure the force F ₂ when the horizontal sliding speed of the ice surface stabilized at 300 mm/s, and the average value of the force F ₂ between them (0.3 second to 0.6 second after the application of the force F ₂ started) The average value until the ice surface) is divided by the force F ₁ as the 'coefficient of dynamic friction on the ice surface'.

In this way, by making the sole of the shoe have a coefficient of kinetic friction with respect to the ice surface greater than the maximum coefficient of static friction with respect to the ice surface, it becomes possible to withstand not only immediately after starting to stand up with force, but also continuously after that. Therefore, it becomes possible to provide a shoe sole capable of exhibiting excellent sliding resistance even when walking on a walking surface with poor conditions such as when walking on an ice surface.

In the shoe sole of the present invention, the specific value of the "coefficient of kinetic friction against the ice surface" is not particularly limited, but is preferably 0.25 or more. As a result, the sole of the shoe can be made more difficult to slip on the ice surface and can be made more safe to walk on. The 'coefficient of kinetic friction on the ice surface' is more preferably 0.30 or more, more preferably 0.35 or more, and optimal if 0.37 or more. In the shoe sole of the present invention, it is also possible to set the 'coefficient of kinetic friction against the ice surface' to 0.39 or more.

The specific structure of the sole of the shoe of the present invention is not particularly limited, as long as it exhibits a characteristic that the coefficient of kinetic friction against the ice surface is greater than the maximum coefficient of static friction against the ice surface. This characteristic is, for example, that a plurality of non-slip protrusions whose lower surfaces serve as ground contact surfaces are formed downward, and concave portions recessed in a bowl shape are formed on the lower surfaces of each anti-slip protrusions, and each concave portion It can be expressed by adopting a structure in which a stepped portion is annularly formed on the inner peripheral surface. At this time, it is preferable to install a water drainage hole in the sole of the shoe to suck up the water entering the concave portion when the bottom surface of the non-slip protrusion is grounded and to discharge it to the periphery of the sole of the shoe. This makes it easy to maintain excellent sliding resistance even on a walking surface under bad conditions, such as when walking on an ice surface with water.

In the shoe sole of the present invention, a row of projections composed of a plurality of non-slip protrusions arranged along the width direction of the shoe sole at predetermined intervals in the width direction of the shoe sole are arranged at predetermined intervals in the front-back direction of the shoe sole. It is preferable to arrange in multiple rows in the state. In other words, it is preferable to match the front and rear positions of the non-slip projections constituting the same row of projections (rows in the width direction of the shoe sole). For example, a case where the non-slip protrusions 20 are arranged in a lattice shape in the width direction and the front-back direction of the shoe sole corresponds to this case. As a result, it becomes possible to make it difficult for snow or the like to accumulate in the gap between the adjacent non-slip protrusions, and it becomes possible to further enhance the sliding resistance of the shoe sole. The reason why it is difficult for snow or the like to accumulate in gaps between adjacent anti-slip protrusions when the non-slip protrusions 20 are arranged in a lattice shape in the width direction and front-back direction of the shoe sole will be described later.

In the shoe sole of the present invention, it is also preferable to provide a midsole portion made of a material lower in hardness than the shoe sole main body (outsole portion) on the upper surface side thereof. This makes it possible to more appropriately express the above-described characteristics (characteristics of being able to endure not only immediately after starting to stand with force but also continuing thereafter).

The use of the shoe sole of the present invention is not particularly limited, and can be provided to various types of shoes. Among them, it can be appropriately provided for commuting shoes for cold regions, school shoes, sports shoes, or work shoes. In addition, it can be appropriately provided for shoes for work in a skating rink and shoes for work in a freezer. The shoe sole of the present invention may be provided in a state integrally formed with the shoe, or may be provided in a state in which it is attachable and detachable to existing shoes.

In addition, the technique of making the coefficient of kinetic friction on the ice surface larger than the maximum coefficient of static friction on the ice surface used in the shoe sole of the present invention can be applied to non-slip members other than the shoe sole. For example, it can be applied to the non-slip member of mats laid on floors, road surfaces, luggage racks, etc., the non-slip member of the tip of a cane, the non-slip member of gloves, and the like. This makes it possible to provide a mat, tip of a cane, gloves, etc. having excellent sliding resistance to an ice surface.

As described above, according to the present invention, a shoe sole capable of enduring not only immediately after starting to stand with strength but also continuing thereafter, and exhibiting excellent sliding resistance even when walking on a poor walking surface such as when walking on an ice surface It becomes possible to provide It also becomes possible to provide shoes provided with this shoe sole. Furthermore, it becomes possible to provide an anti-slip member to which this shoe sole technology is applied.

Fig. 1 is a bottom view showing a state of the shoe sole of the first embodiment seen from the bottom side.
Fig. 2 is a bottom view of the shoe sole of the first embodiment as seen from the bottom side, and is an enlarged view showing a state in which portion A in Fig. 1 of the shoe sole is enlarged.
Fig. 3 is a perspective view showing an enlarged state of one non-slip protrusion of the shoe sole of the first embodiment.
Fig. 4 is a bottom view of the shoe sole of the second embodiment as seen from the bottom side, and is an enlarged view of a portion corresponding to section A in Fig. 1 of the shoe sole.
Fig. 5 is a perspective view showing an enlarged state of one non-slip protrusion of the shoe sole of the second embodiment.
Fig. 6 is a bottom view of the shoe sole of the third embodiment as seen from the bottom side, and is an enlarged view of a portion corresponding to section A in Fig. 1 of the shoe sole.
Fig. 7 is a perspective view showing an enlarged state of one non-slip protrusion of the shoe sole of the third embodiment.
8 is a graph showing the results of measuring the change in the coefficient of friction with respect to the ice surface in a state in which water is not formed on the surface of the shoe sole of Example 1.
9 is a graph showing the results of measuring the change in the coefficient of friction with respect to the ice surface in a state in which no water has formed on the surface of the shoe sole of Comparative Example 1.
FIG. 10 is a graph showing the results of measuring the change in friction coefficient with respect to the ice surface in a state where water is present on the surface of the shoe sole of Example 1.
FIG. 11 is a graph showing the results of measuring the change in coefficient of friction with respect to the ice surface in a state where water is present on the surface of the shoe sole of Comparative Example 1.
Fig. 12 is a bottom view showing the state of the shoe sole of the fourth embodiment as viewed from the bottom side.
Fig. 13 is a bottom view of the shoe sole of the fourth embodiment as viewed from the bottom side, and is an enlarged view showing a state in which portion A in Fig. 12 of the shoe sole is enlarged.
Fig. 14 is a diagram showing the state of the sole of the shoe when walking with the shoe provided with the sole of the fourth embodiment, viewed from the side of the shoe.
Fig. 15 is a diagram showing an example of arrangement of non-slip protrusions having the same effect as the shoe sole of the fourth embodiment.
Fig. 16 is a view showing the state of the shoe provided with the shoe sole of the fifth embodiment, viewed from the side of the shoe.
Fig. 17 is a bottom view showing the state of the shoe sole of the sixth embodiment as viewed from the bottom side.
Fig. 18 is a view showing the state of the shoe provided with the shoe sole of the sixth embodiment, viewed from the side of the shoe.

Preferred embodiments of the present invention will be described more specifically with reference to drawings. Hereinafter, for convenience of description, the present invention will be described by taking a shoe sole as an example. However, the structure described below is not limited to the case of employing in soles of shoes, and can be suitably employed in other non-slip members such as mats, cane tips, and gloves. In addition, below, the shoe sole of a total of 6 embodiments from the 1st embodiment to the 6th embodiment is demonstrated. However, the technical scope of the present invention is not limited to these embodiments, and various structures can be employed in which the coefficient of kinetic friction with respect to the ice surface is greater than the maximum coefficient of static friction with respect to the ice surface. Furthermore, in the following, the sole of the shoe of the first embodiment will be mainly described, but the configuration described in the sole of the shoe of the first embodiment can be used in the sole of the shoe of the other embodiment as long as the configuration does not contradict the sole of the shoe of the other embodiment. It can also be appropriately employed for outsoles. Similarly, the configurations described in the soles of the shoes of the second and third embodiments can be appropriately adopted in the soles of the shoes of the first embodiment as long as the structures are not contradictory in the soles of the shoes of the first embodiment.

1. Outsole of the first embodiment

Fig. 1 is a bottom view showing a state of the shoe sole of the first embodiment seen from the bottom side. Fig. 2 is a bottom view of the shoe sole of the first embodiment as seen from the bottom side, and is an enlarged view showing a state in which portion A in Fig. 1 of the shoe sole is enlarged. Fig. 3 is a perspective view showing an enlarged state of one non-slip protrusion of the shoe sole of the first embodiment. Fig. 3(a) shows the entire non-slip protrusion, and Fig. 3(b) shows a state in which the non-slip protrusion of Fig. 3 (a) is broken into a plane B parallel to the y-z plane.

As shown in Fig. 1, the shoe sole of the first embodiment has a plurality of non-slip protrusions 20 formed downward on the lower surface side of the shoe sole body 10 (outsole portion). The thickness of the shoe sole body 10 is usually 2 to 30 mm. The non-slip protrusion 20 has its lower end face (negative end face in the z-axis direction) serving as a grounding surface (surface in contact with the walking surface). In the shoe sole of the first embodiment, the non-slip projections 20 are provided over the entire lower surface of the shoe sole body 10, but the region of the shoe sole body 10 that is difficult to contact with the walking surface, that is, Areas that are difficult to contribute to the improvement of sliding resistance (for example, the portion shown by cross hatching in FIG. 1 (the portion overlapping the sole in the shoe sole body 10 and the periphery of the shoe sole body 10, etc.)) In, it is also possible not to install the protrusion 20 for non-slip. Hereinafter, the area where the anti-slip protrusion 20 is not provided on the lower surface of the shoe sole body 10 is referred to as a 'protrusion non-formation area', and the non-slip protrusion 20 in the shoe sole body 10 The area in which the is installed is referred to as a 'protrusion formation area'.

The number of non-slip protrusions 20 installed per unit area varies depending on the dimensions of the anti-slip protrusions 20 and the like, and is not particularly limited. However, if the number of anti-slip protrusions 20 per unit area is too small, the total number of anti-slip protrusions 20 installed on the shoe sole body 10 decreases, and the maximum static friction coefficient and the dynamic friction coefficient of the shoe sole There is a risk that it will be difficult to raise to the required level. Therefore, the number of non-slip protrusions 20 per unit area (the value in the protrusion formation area when there is a protrusion non-formation area on the lower surface of the shoe sole body 10. The same below) is usually 0.5/cm ² it becomes more The number of non-slip protrusions 20 per unit area is preferably 0.8/cm ² or more, and more preferably 1/cm ² or more.

On the other hand, if the number of anti-slip protrusions 20 per unit area is too large, the size of each anti-slip protrusion 20 inevitably becomes small, making it difficult to mold a shoe outsole or making it difficult to secure the strength of each anti-slip protrusion 20. There is a risk that it will become difficult. Therefore, the number of non-slip protrusions 20 per unit area is usually 10/cm ² or less. The number of non-slip protrusions 20 per unit area is preferably 5/cm ² or less, more preferably 3/cm ² or less, and even more preferably 2/cm ² or less. In the shoe sole of the first embodiment, the number of anti-slip protrusions 20 per unit area is substantially uniform over the entire lower surface of the sole body 10 (protrusion formation area), but the anti-slip protrusions per unit area ( 20) may be increased or decreased depending on the location.

The gap width (W ₀ , FIG. 2 ) of adjacent non-slip protrusions 20 is not particularly limited either. However, when the gap width W ₀ is made too narrow, there is a risk that gravel, sand, and the like may easily accumulate in the gap between the adjacent non-slip protrusions 20 . In addition, when standing on the sole of a shoe, the non-slip protrusions 20 are compressed in the height direction and widened in the radial direction, so that adjacent anti-slip protrusions 20 interfere with each other, making it difficult to obtain the desired sliding performance. There are concerns about quality. Therefore, the gap width (W ₀ , the minimum value when the gap width (W ₀ ) differs depending on the place. The same applies in the next sentence) is usually 0.1 mm or more. The gap width (W ₀ ) is preferably 0.3 mm or more, and more preferably 0.5 mm or more. On the other hand, if the width W ₀ of the gap is too wide, it becomes difficult to increase the number of anti-slip protrusions 20 per unit area, and there is a possibility that it becomes difficult to obtain desired slide resistance. Therefore, the width of the gap (W ₀ , the maximum value when the width of the gap (W ₀ ) differs depending on the place. The same applies in the next sentence) is usually 10 mm or less. The gap width (W ₀ ) is preferably 5 mm or less, and more preferably 3 mm or less.

The non-slip protrusion 20 is usually integrally molded with respect to the shoe sole body 10. As the molding material for the shoe sole, various kinds of rubber, elastomer, etc. conventionally used for the outsole part of the shoe sole can be employed. More specifically, one or more selected from the group consisting of synthetic rubber, natural rubber, thermoplastic styrene butadiene rubber (SBS), styrenic thermoplastic elastomer (SIS), ethylene vinyl acetate copolymer (EVA), polyurethane and polyvinyl chloride A material made of a kind of elastomer and a rubber compounding agent can be used as a molding material for shoe soles.

The hardness of the shoe sole (hardness of the outsole portion) also varies depending on the molding material of the shoe sole, and is not particularly limited. However, if the outsole portion of the shoe sole is too soft, it may be difficult to maintain the strength of the non-slip protrusion 20 . Therefore, when the outsole part of the shoe sole is formed of rubber, the hardness of the outsole part (a value measured by A durometer. Hereinafter, the same applies to rubber) is usually 10 degrees or more, preferably 20 degrees or more, , It is more preferable when it is 30 degrees or more, and it is more preferable when it is 35 degrees or more. In addition, when the outsole part of the shoe sole is formed of EVA, the hardness of the outsole part (a value measured by E durometer. Hereinafter, the same applies to EVA) is preferably 10 degrees or more, more preferably 20 degrees or more, , more preferably 30 degrees or more. On the other hand, if the outsole portion of the sole of the shoe is too hard, the non-slip protrusion 20 becomes difficult to elastically deform, making it difficult to follow the walking surface, and there is a risk that desired sliding performance may be difficult to obtain. In addition, there is a possibility that the cushioning property of the shoe sole is lowered and the wearing comfort of the shoe is deteriorated. Therefore, when the outsole part of the shoe sole is formed of rubber, the hardness of the outsole part is preferably 70 degrees or less, more preferably 60 degrees or less, and even more preferably 50 degrees or less. In addition, when the outsole part of the shoe sole is made of EVA, the hardness of the outsole part is usually 70 degrees or less, preferably 60 degrees or less, more preferably 50 degrees or less, and even more preferably 40 degrees or less. .

By the way, each anti-slip protrusion 20 is normally formed in a columnar shape. In the shoe sole of the first embodiment, as shown in Fig. 3(a), the non-slip protrusion 20 is formed in a cylindrical shape. However, the shape of the anti-slip protrusion 20 is not formed in a cylindrical shape, but may be a polygonal column shape such as a triangular columnar shape, a square columnar shape, or a hexagonal columnar shape, or an elliptical columnar shape, or a combination thereof. In the shoe sole of the first embodiment, the outer diameter (D ₀ , Fig. 3(a)) of the non-slip protrusion 20 is constant regardless of the height, but the outer circumferential surface of the anti-slip protrusion 20 is tapered. The outer diameter D ₀ of the anti-slip protrusion 20 may be changed according to the height.

The ratio H ₀ /D 0 of the height (H ₀ , FIG. 3 (a)) to the outer diameter (D ₀ , FIG. 3 (a)) of the non-slip protrusion ₂₀ is the molding material of the non-slip protrusion 20, etc. Depending on this, it is also different and is not particularly limited. However, when H ₀ /D ₀ is too small, the non-slip protrusion 20 becomes a flat shape, and there is a possibility that it is difficult to obtain desired sliding resistance. Therefore, H ₀ /D ₀ is usually 0.1 or more. H ₀ /D ₀ is preferably 0.2 or more, and more preferably 0.3 or more. On the other hand, when H ₀ /D ₀ is too large, the anti-slip protrusion 20 becomes thin and long, and there is a concern that it may become difficult to maintain the strength of the anti-slip protrusion 20 high. Therefore, H ₀ /D ₀ is usually 3 or less. H ₀ /D ₀ is preferably 2 or less, and more preferably 1 or less.

The outer diameter (D ₀ , FIG. 3(a)) of the non-slip protrusion 20 is usually 2 mm or more, preferably 5 mm or more, and more specifically, 7 mm or more. In addition, the outer diameter (D ₀ ) of the non-slip protrusion 20 is usually 30 mm or less, preferably 20 mm or less, and more specifically, 15 mm or less. Meanwhile, the height of the non-slip protrusion 20 (H ₀ , FIG. 3(a)) is usually 1 mm or more, preferably 2 mm or more, and more specifically, 3 mm or more. In addition, the height (H ₀ ) of the non-slip protrusion 20 is usually 15 mm or less, preferably 10 mm or less, and more specifically, 7 mm or less.

Further, in the shoe sole of the first embodiment, as shown in Fig. 3, a concave portion 21 recessed in a bowl shape with a circular cross section is formed on the lower end surface of each non-slip protrusion 20. Therefore, it is possible to adsorb the non-slip protrusion 20 to the walking surface like a sucker. The inner circumferential surface of the concave portion 21 may be formed smoothly, but in the shoe sole of the first embodiment, the stepped portion 22 is formed in an annular shape on the inner circumferential surface of the concave portion 21 . Therefore, it became possible to make it difficult to slip not only immediately after starting to stand up with the sole of the shoe, but also after that. Further, by forming the stepped portion 22 in an annular shape, it is possible to develop the slip resistance in all directions. The shoe outsole of the first embodiment is supposed to have excellent sliding performance not only when standing with force in the front-rear direction but also when standing with force in the lateral direction (for example, when repeatedly jumping sideways).

In the case where the stepped portion 22 is provided on the inner circumferential surface of the concave portion 21, the number of stepped portions 22 is not particularly limited. However, when the number of stages of the stepped portion 22 is small, the stepped portion 22 tends to disappear due to abrasion of the non-slip protrusion 20 . Moreover, there exists a possibility that it may become difficult to obtain desired slide resistance performance. Therefore, the number of stages of the stepped portion 22 is preferably two or more, and more preferably three or more. On the other hand, there is no particular upper limit to the number of stages of the stepped portion 22, but if the number of stages of the stepped portion 22 is too large, molding of the non-slip protrusion 22 may become difficult. Therefore, the number of stages of the stepped portion 22 is usually 10 or less. The number of stages of the stepped portion 22 is preferably 7 or less, and more preferably 5 or less.

The ratio H ₁ /W 1 of the height (H ₁ , FIG. 3(b)) of the stepped portion 22 to the width (W ₁ , FIG. 3(b)) of the stepped portion ₂₂ is not particularly limited. However, if H ₁ /W ₁ is too small, the slope of the inner circumferential surface of the concave portion 21 inevitably becomes gentle, making it difficult for the non-slip protrusion 20 to be adsorbed to the walking surface. Therefore, H ₁ /W ₁ is usually greater than or equal to 0.1. H ₁ /W ₁ is preferably 0.3 or more, and more preferably 0.5 or more. On the other hand, if H ₁ /W ₁ is too large, the step portion 22 is located deep from the bottom surface of the non-slip protrusion 20, and it is difficult for the corner portion of the step portion 22 to come into contact with the walking surface, resulting in the desired slide resistance. Performance may be difficult to obtain. Therefore, H ₁ /W ₁ is usually 3 or less. H ₁ /W ₁ is preferably 2 or less, and more preferably 1.5 or less.

The width (W ₁ , FIG. 3(b)) of the stepped portion 22 varies depending on the outer diameter (D ₀ ) of the non-slip protrusion 20 and the number of stages of the stepped portion 22, but is usually 0.3 mm or more. And, preferably, it is 0.4 mm or more, and more specifically, it can be 0.5 mm or more. Also, the width W ₁ of the stepped portion 22 is usually 5 mm or less, preferably 3 mm or less, and more specifically 1 mm or less. When the stepped portions 22 are provided in two or more stages, the width W ₁ of the stepped portions 22 may be set to be the same for all the stepped portions 22 or may be varied depending on the stage. On the other hand, the height (H ₁ , FIG. 3(b)) of the stepped portion 22 varies depending on the height H ₀ of the non-slip protrusion 20 and the number of stages of the stepped portion 22, but is usually 0.1 mm or more. It becomes, Preferably it becomes 0.2 mm or more, More specifically, it can be 0.3 mm or more. In addition, the height (H ₁ ) of the stepped portion 22 is usually 3 mm or less, preferably 2 mm or less, and more specifically, 1 mm or less. When the stepped portions 22 are provided in two or more stages, the height H ₁ of the stepped portions 22 may be set to be the same for all the stepped portions 22 or may be varied depending on the stage.

Furthermore, in the shoe sole of the first embodiment, as shown in Fig. 3, a water drainage hole 23 is provided in the center of the concave portion 21 of each non-slip protrusion 20. This water drainage hole 23 communicates with a water discharge path 11 provided in the shoe sole body 10 and is provided. The water discharge path 11 is provided in a state of communication with the outer circumferential surface (side surface) of the shoe sole body 10 . Therefore, when walking on a walking surface with water, the water entering the concave portion 22 is sucked up by the water drain hole 23, and then the shoe sole body 10 through the water discharge path 11 It is designed to be discharged to the outside of the Therefore, even when walking on a walking surface with water, the sliding resistance of the shoe sole can be maintained. Although there is no particular limitation on how the water discharge path 11 is provided, in the shoe sole of the first embodiment, the concave groove formed on the upper surface (positive side in the z-axis direction) of the shoe sole body 10 is water It is set as the discharge path 11. Since a midsole (not shown) is fixed to the upper surface side of the shoe sole main body 10 (outsole), the upper side of the water discharge path 11 (concave groove) is blocked by the midsole.

The diameter (D ₁ , FIG. 3(a)) of the water drain hole 23 is the diameter (D ₀ ) of the non-slip protrusion 20, the number of stages of the stepped portion 22, and the width of the stepped portion 22. (W ₁ ) It is also different depending on the like and is not particularly limited. However, if the diameter D ₁ of the draining hole 23 is too small, there is a concern that gravel, sand, etc. may easily accumulate in the draining hole 23 . Therefore, the diameter D ₁ of the water drain hole 23 is usually 0.5 mm or more. The diameter D ₁ of the water drain hole 23 is preferably 1 mm or more, and more preferably 1.5 mm or more. On the other hand, if the diameter (D ₁ ) of the water drain hole 23 is too large, the outer diameter (D ₁ ) of the anti-slip protrusions 20 inevitably increases, and it becomes difficult to increase the number of anti-slip protrusions 20 per unit area. There is a risk that it may become difficult to obtain the desired bow resistance performance. Therefore, the diameter D ₁ of the water drain hole 23 is usually 20 mm or less. The diameter D ₁ of the water drain hole 23 is preferably 10 mm or less, and more preferably 7 mm or less.

In the shoe sole of the first embodiment described above, the coefficient of kinetic friction against the ice surface (referred to as μ ₁ ) is greater than the maximum coefficient of static friction against the ice surface (referred to as μ ₀ ). The ratio of the dynamic friction coefficient (μ ₁ ) to the maximum static friction coefficient (μ ₀ ) on the ice surface (μ ₁ / μ ₀ ) is not particularly limited as long as it is greater than 1, but is preferably 1.1 or more, and more preferably 1.2 or more. do. In the shoe sole of the first embodiment, it is also possible to set μ ₁ /μ ₀ on the ice surface to 1.3 or more as will be described later. Although there is no particular upper limit to μ ₁ / μ ₀ , it is thought that in reality, μ ₁ / μ ₀ on the ice surface is limited to about 1.5 to 2.

A specific value of the coefficient of kinetic friction (μ ₁ ) with respect to the ice surface is not particularly limited either. However, if the coefficient of kinetic friction (μ ₁ ) is too small, it can no longer be said that the sliding resistance is excellent. Therefore, the coefficient of kinetic friction against the ice surface (μ ₁ ) is usually 0.3 or more. As described above, the coefficient of kinetic friction (μ ₁ ) against the ice surface is preferably 0.25 or more, more preferably 0.30 or more, more preferably 0.35 or more, and optimal if 0.37 or more. In the shoe sole of the first embodiment, as will be described later, the coefficient of kinetic friction (μ ₁ ) against the ice surface can be set to 0.39 or more. The higher the coefficient of kinetic friction (μ ₁ ) is, the better it is, but realistically it is considered difficult to set it to 0.7 or more on the ice surface.

By the way, in the case where actual shoes are provided with the shoe sole of the first embodiment, it is also preferable to provide a midsole portion (not shown) on the upper surface side of the shoe sole main body 10. The hardness of the midsole portion is usually lower than that of the sole body 10 of the shoe. As a result, it is possible to more properly express the characteristic of being able to endure not only immediately after starting to stand up with strength but also after that, more properly in actual shoes. The molding material of the midsole portion is not particularly limited as long as it is softer than the outsole portion. As the molding material for the midsole portion, various rubbers and elastomers conventionally used for the midsole portion of shoe soles can be employed. More specifically, one or more selected from the group consisting of synthetic rubber, natural rubber, thermoplastic styrene butadiene rubber (SBS), styrenic thermoplastic elastomer (SIS), ethylene vinyl acetate copolymer (EVA), polyurethane and polyvinyl chloride A material made of a kind of elastomer and a rubber compounding agent can be used as a molding material for the midsole portion. Among them, EVA is preferable as a molding material for the midsole portion.

The hardness of the midsole is not particularly limited as long as it is lower than the hardness of the outsole, but it is preferable to lower the hardness of the outsole by at least 5 to 10 degrees, and in some cases by 15 to 20 degrees or more. For example, when the midsole part is made of EVA, the hardness of the midsole part (a value measured with an E hardness meter. Hereinafter, the same applies to EVA) is preferably 50 degrees or less, more preferably 40 degrees or less, It is more preferable if it is 30 degrees or less. The lower limit of the hardness of the midsole is not particularly limited, but if the midsole is too soft, the strength of the midsole may not be maintained. Therefore, when the midsole portion is formed of EVA, the hardness of the midsole portion is preferably 5 degrees or more, more preferably 10 degrees or more, and even more preferably 15 degrees or more.

2. Outsole of the second embodiment

Next, the shoe sole of the second embodiment will be described. Fig. 4 is a bottom view of the shoe sole of the second embodiment as seen from the bottom side, and is an enlarged view of a portion corresponding to section A in Fig. 1 of the shoe sole. Fig. 5 is a perspective view showing an enlarged state of one non-slip protrusion of the shoe sole of the second embodiment. Fig. 5 (a) shows the entire non-slip protrusion, and Fig. 5 (b) shows a state in which the anti-slip protrusion of Fig. 5 (a) is broken into a plane B parallel to the y-z plane.

In the shoe sole of the first embodiment described above, the non-slip protrusion 20 is formed in a cylindrical shape, but in the shoe sole of the second embodiment, as shown in FIGS. 4 and 5, respectively, the anti-slip protrusion 20 ) is formed in the shape of a square prism. Concomitantly with this, in the shoe sole of the second embodiment, the drain hole 23 is formed in a rectangular cross section, and the concave portion 21 is also formed in a bowl shape with a rectangular cross section. In addition, the stepped portion 22 is formed in a quadrangular annular shape. Even by providing the anti-slip protrusion 20 in the shape of a square column in this way, the coefficient of kinetic friction (μ ₁ ) against the ice surface can be made higher than the maximum coefficient of static friction (μ ₀ ) against the ice surface.

The sole of the shoe of the second embodiment has an advantage that the non-slip protrusions 20 can be densely arranged compared to the sole of the shoe of the first embodiment. In addition, since many straight parts can be secured in the stepped part 22, it also has an advantage that it is easy to increase the sliding resistance in the direction perpendicular to the straight part. As for the structure not specifically mentioned in the shoe sole of the second embodiment, almost the same structure as the shoe sole of the first embodiment can be employed.

3. Outsole of the third embodiment

Next, the shoe sole of the third embodiment will be described. Fig. 6 is a bottom view of the shoe sole of the third embodiment as seen from the bottom side, and is an enlarged view of a portion corresponding to section A in Fig. 1 of the shoe sole. Fig. 7 is a perspective view showing an enlarged state of one non-slip protrusion of the shoe sole of the third embodiment. Fig. 7 (a) shows the entire non-slip protrusion, and Fig. 7 (b) shows a state in which the non-slip protrusion of Fig. 7 (a) is broken into a plane B parallel to the y-z plane.

In the shoe sole of the third embodiment, as shown in Figs. 6 and 7, each non-slip protrusion 20 is formed in the shape of a hexagonal column. Correspondingly, in the shoe sole of the third embodiment, the drain hole 23 is formed in a hexagonal cross section, and the concave portion 21 is also formed in a bowl shape with a hexagonal cross section. In addition, the stepped portion 22 is formed in a hexagonal annular shape. By providing the anti-slip protrusion 20 in the shape of a hexagonal column in this way, the coefficient of kinetic friction (μ ₁ ) against the ice surface can be made larger than the maximum coefficient of static friction (μ ₀ ) against the ice surface.

The shoe sole of the third embodiment has the advantage that the non-slip protrusions 20 can be densely arranged as in the shoe sole of the second embodiment. In addition, since many straight parts can be secured in the stepped part 22, it also has an advantage that it is easy to increase the sliding resistance in the direction perpendicular to the straight part. As for the structure not specifically mentioned in the shoe sole of the third embodiment, almost the same structure as the shoe sole of the first embodiment and the shoe sole of the second embodiment can be employed.

4. Outsole of the fourth embodiment

Next, the shoe sole of the fourth embodiment will be described. Fig. 12 is a bottom view showing the state of the shoe sole of the fourth embodiment as viewed from the bottom side. Fig. 13 is a bottom view of the shoe sole of the fourth embodiment as seen from the bottom side, and is an enlarged view showing a state in which portion A in Fig. 12 of the shoe sole is enlarged. Fig. 14 is a diagram showing the state of the sole of a shoe when walking with the shoe provided with the sole of the fourth embodiment, viewed from the side of the shoe.

As shown in Figs. 12 and 13, in the shoe sole of the fourth embodiment, each non-slip protrusion 20 is formed in the shape of a square column. The non-slip protrusion 20 in the shoe sole of the fourth embodiment has the same shape as the anti-slip protrusion 20 (FIG. 5) in the shoe sole of the second embodiment described above. However, in the shoe sole of the second embodiment, as shown in FIG. 4, the non-slip protrusions 20 adjacent in the width direction (x-axis direction) of the shoe sole extend in the front-back direction (y-axis direction) of the shoe sole. Although arranged in a state shifted by 1/2 pitch, in the shoe sole of the fourth embodiment, as shown in FIG. 13, the non-slip protrusions 20 adjacent in the width direction (x-axis direction) of the shoe sole, They are arranged so as not to shift in the front-back direction (y-axis direction) of the outsole.

In other words, in the shoe sole of the fourth embodiment, as shown in FIG. 12, a plurality of soles disposed along the width direction (x-axis direction) of the shoe sole at predetermined intervals in the width direction (x-axis direction) of the shoe sole. The rows of projections L (each broken line shown in FIG. 12 corresponds to one row of projections L) composed of anti-slip projections are arranged in a plurality of rows at predetermined intervals in the front-back direction (y-axis direction) of the shoe sole. It is in a deployed state. By arranging the non-slip protrusions 20 in a lattice shape in this way, it is possible to further enhance the sliding resistance of the shoe sole. In particular, it becomes possible to exert a desired anti-slip action on the anti-slip protrusion 20 even when walking on a snowy surface.

This is because when snow or the like accumulates in the gap between the adjacent non-slip protrusions 20, in addition to making it difficult for the non-slip protrusions 20 to elastically deform, the bottom surface of the shoe sole also becomes flat (there is no corner that can stand on the walking surface). ), so the sole of the shoe may become slippery. This is because in the sole of the shoe of the fourth embodiment, as shown in Fig. 14, it is believed that snow or the like has accumulated in the gap between the adjacent non-slip protrusions 20 (the portion indicated by hatching in the same figure, α). Even when walking, when the sole of the shoe lands or when the ground is kicked, the periphery of the grounding portion of the sole of the shoe is in a curved state, and the width of the gap (α) between the protrusions 20 for preventing slipping adjacent in the front and rear direction (W ₀ ´ ) becomes wider than originally, and since the gap α is penetrated in the width direction of the shoe sole, it becomes possible to easily remove snow accumulated in the gap α.

Therefore, in the shoe sole of the fourth embodiment, it becomes possible to make the gap width (W ₀ , FIG. 13 ) of adjacent non-slip protrusions 20 narrower than that of the shoe sole of the second embodiment. Therefore, in the shoe sole of the fourth embodiment, the non-slip protrusions 20 can be densely arranged, and it becomes possible to exhibit more excellent sliding performance. As for the structure not specifically mentioned in the shoe sole of the 4th embodiment, almost the same structure as the shoe sole of the 1st to 3rd embodiment can be adopted.

However, as shown in FIG. 13, even if the anti-slip protrusions 20 are not arranged in a lattice shape in the width direction and the front-back direction of the shoe sole, the anti-slip protrusions constituting the same protrusion column L (column in the width direction of the shoe sole) ( If the front and back positions of 20) coincide, the same effect as described above (the effect of making it easy for snow and the like to fall out in the gap α between the adjacent non-slip protrusions 20 in the front and back direction) is obtained. Fig. 15 is a view showing an arrangement example of non-slip protrusions 20 from which the same effects as those of the shoe sole of the fourth embodiment can be obtained. FIG. 15 is an enlarged view of a portion corresponding to section A in FIG. 12 . In the shoe sole shown in FIG. 15, the position of the anti-slip projection 20 constituting a certain row of projections L and the anti-slip projection 20 constituting another row of projections L adjacent to the row of projections L in the front-back direction ) is shifted by 1/2 pitch in the width direction (x-axis direction) of the shoe sole. The above effect is also obtained in the shoe sole in which the non-slip protrusion 20 is arranged as shown in FIG. 15 .

5. Outsole of the fifth embodiment

Next, the shoe sole of the fifth embodiment will be described. Fig. 16 is a diagram showing an example of a shoe provided with a shoe sole according to the fourth embodiment, viewed from the side of the shoe. Fig. 16 shows a state in which the periphery of the sole of the shoe is seen through.

In the shoe sole of the fifth embodiment, the shape and arrangement of the non-slip protrusions 20 are substantially the same as those of the shoe sole of the fourth embodiment. However, in the shoe sole of the fifth embodiment, as shown in Fig. 16, the soft midsole portion 32 is provided on the upper surface side of the shoe sole main body 10 (outsole portion). The hardness of the soft midsole portion 32 is lower than that of the shoe sole main body 10 (outsole portion). As a result, it is possible to more properly express the characteristic of being able to endure not only immediately after starting to stand up with strength but also after that, more appropriately in actual shoes. Regarding the molding material and hardness of the soft midsole part 32, the above '1. It is the same as what was described for the midsole part in the 'sole sole of the first embodiment'.

Further, in the shoe sole of the fourth embodiment, as shown in FIG. 14, the non-slip protrusion 20 provided on the toe portion and the non-slip protrusion 20 provided on the heel portion have a common sole body 10 , outsole), but in the shoe sole of the fifth embodiment, as shown in FIG. 16, the anti-slip protrusion 20 of the toe portion and the non-slip protrusion 20 of the heel portion are separate shoe soles. It is installed in the body (10, outsole). Therefore, the soft midsole portion 32 described above is also provided separately in the toe portion and the heel portion. The sole body 10 (outsole portion) and soft midsole portion 32 of the toe portion, and the sole body 10 (outsole portion) and soft midsole portion 32 of the heel portion share a common midsole body 31. It is fixed.

As for the structure not specifically mentioned in the shoe sole of the fifth embodiment, almost the same structure as the shoe soles of the first to fourth embodiments can be employed.

6. Outsole of the sixth embodiment

Next, the shoe sole of the sixth embodiment will be described. Fig. 17 is a bottom view showing the state of the shoe sole of the sixth embodiment as viewed from the bottom side. Fig. 18 is a view showing the state of the shoe provided with the shoe sole of the sixth embodiment, viewed from the side of the shoe. Fig. 18 shows the periphery of the sole of the shoe in a transparent state.

In the shoe sole of the sixth embodiment, the shape of the non-slip protrusion 20 is substantially the same as that of the shoe sole of the second, fourth and fifth embodiments. Also, as shown in Fig. 17, the shoe sole of the sixth embodiment has anti-slip protrusions 20 on almost the entire lower surface of the shoe sole, and in this respect is almost the same as the shoe sole of the first embodiment. . Furthermore, in the sole of the shoe of the sixth embodiment, the non-slip protrusions 20 are arranged in a lattice shape in the width direction and the front-back direction of the shoe sole, and in this respect is substantially the same as the shoe sole of the fourth embodiment.

Furthermore, the shoe sole of the sixth embodiment is different from the shoe sole of the fifth embodiment in that the soft midsole portion 32 is provided on the upper surface side of the shoe sole body 10 (outsole portion) as shown in FIG. are made the same However, in the shoe sole of the fifth embodiment, as shown in FIG. 16, the shoe sole body 10 (outsole portion) and the soft midsole portion 32 are divided and provided at the toe portion and the heel portion, respectively. In the shoe sole of the sixth embodiment, as shown in Fig. 18, the shoe sole body 10 (outsole portion) and the soft midsole portion 32 are made common in the toe portion and the heel portion, respectively.

As for the structure not specifically mentioned in the shoe sole of the sixth embodiment, almost the same structure as the shoe sole of the first to fifth embodiments can be employed.

7. Measure

7.1 Measurement method

In order to confirm the slip resistance of the shoe sole of the present invention, the shoe sole of Example 1 belonging to the technical scope of the shoe sole of the present invention was manufactured, and an experiment was performed to measure the maximum static friction coefficient and dynamic friction coefficient against the ice surface. . In addition, in order to evaluate the slip resistance performance of Example 1, the shoe soles of other companies that are evaluated to have the best slip resistance performance on ice among the shoe soles currently on the market (hereinafter referred to as 'shoe soles of Comparative Example 1'). The same measurements were performed for The method of measuring the maximum coefficient of static friction and the coefficient of kinetic friction was performed by the steps 1 to 6 described above. However, in the above step 1, the shoe sole was installed on the ice surface without water on the surface, but here, in order to evaluate the sliding performance in a more slippery condition, the ice surface with no water on the surface. In addition to the case where the shoe sole was installed for , the measurement was also performed on the case where the shoe sole was installed on the surface with water on the surface.

The shoe sole of Example 1 corresponds to the shoe sole of the first embodiment described above, and the non-slip protrusion 20 is formed in a cylindrical shape. In the shoe sole of Example 1, the gap width (W ₀ , FIG. 2 ) of adjacent anti-slip protrusions 20 is 1.8 mm, and the number of anti-slip protrusions 20 per unit area is about 1.2/cm ^{2 .} there is. In addition, the outer diameter (D ₀ , FIG. 3 (a)) of the non-slip protrusion 20 is 8 mm, and the height (H ₀ , FIG. 3 (a)) of the non-slip protrusion 20 is 4 mm, and the non-slip The ratio (H ₀ /D ₀ ) of the height (H ₀ ) to the outer diameter (D ₀ ) of the prevention protrusion (20) is 0.5. Furthermore, the number of stages of the stepped portion 22 is three, and the width W ₁ of the stepped portion 22 ( FIG. 3 (b)) is 0.5 mm in all the stepped portions 22, The height H ₁ ( FIG. 3(b) ) is 0.3 mm in all the stepped portions 22 . Therefore, the ratio (H ₁ /W ₁ ) of the height (H ₁ ) to the width (W ₁ ) of the stepped portion 22 is 0.6. In addition, the diameter D ₁ of the water drain hole 23 (FIG. 3(a)) is set to 3 mm. The hardness of the rubber used for the shoe sole (outsole portion) is within the range of 35 to 50 degrees.

7.2 Measurement results

First, the measurement results of the ice surface in a state in which no water has formed on the surface will be described. FIG. 8 is a graph showing the results of measuring the change in the coefficient of friction on the ice surface in the state in which water is not formed on the surface of the shoe sole of Example 1. FIG. 9 is a graph showing the results of measuring the change in the coefficient of friction on the ice surface in the state in which water is not formed on the surface of the shoe sole of Comparative Example 1. In the graphs of FIGS. 8 and 9 , the time on the horizontal axis represents the time from the start of applying the force (F ₂ ) in the horizontal direction to the ice surface in the step 3 above. About the meaning of the horizontal axis of a graph, it is the same also in FIG. 10 and FIG. 11 mentioned later.

It can be seen that the maximum coefficient of static friction (μ ₀ ) of the sole of the shoe of Example 1 on the ice surface with no water formed on the surface is 0.29 from the peak (P ₀ ) value of the graph of FIG. 8 . Further, the coefficient of kinetic friction (μ ₁ ) of the sole of the shoe of Example 1 on the ice surface in a state in which water is not formed on the surface is 0.39 by calculating the average value of the range (R ₀ ) of the graph in FIG. 8 . Similarly, if the maximum coefficient of static friction (μ ₀ ) and coefficient of kinetic friction (μ ₁ ) of the sole of the shoe of Comparative Example 1 on the ice surface in a state where no water has formed on the surface is obtained from the graph shown in FIG. 9, the maximum coefficient of static friction (μ ₀ ) is 0.39, and the coefficient of kinetic friction (μ ₁ ) is 0.30. These results are summarized in Table 1 below.

Maximum coefficient of static friction (μ ₀ ) Coefficient of dynamic friction (μ ₁ ) Example 1 0.29 0.39 Comparative Example 1 0.39 0.30

Looking at 'Comparative Example 1' in Table 1, the sole of the shoe of Comparative Example 1 has a dynamic friction coefficient (μ ₁ ) smaller than the maximum static friction coefficient (μ ₀ ), and a dynamic friction for the maximum static friction coefficient (μ ₀ ). It can be seen that the ratio (μ ₁ /μ ₀ ) of the coefficient μ ₁ is about 0.77. Therefore, it can be said that the sole of the shoe of Comparative Example 1 exhibits excellent sliding resistance immediately after starting to stand on the ice surface with force, but tends to be slippery thereafter. In fact, when walking on the ice surface while wearing the shoes with soles of Comparative Example 1, the ice surface can be captured reliably immediately after starting to stand with force (immediately after landing on the walking surface or immediately after starting to kick the walking surface), but after that had a tendency to slip. Therefore, it can be seen that considerable caution is required even when walking on an ice surface while wearing shoes having soles of Comparative Example 1, which are evaluated to have the best slip resistance on ice among those currently on the market. It was difficult to run on the ice surface or repeatedly jump sideways on the ice surface even when wearing the shoes having the soles of the shoes of Comparative Example 1.

In contrast, looking at 'Example 1' in Table 1, the shoe sole of Example 1 has a coefficient of dynamic friction (μ ₁ ) greater than the maximum coefficient of static friction (μ ₀ ), and a maximum coefficient of static friction (μ ₀ ). It can be seen that the ratio (μ ₁ / μ ₀ ) of the coefficient of kinetic friction (μ ₁ ) to that is about 1.34. In addition, the coefficient of kinetic friction (μ ₁ ) of the sole of the shoe of Example 1 is 0.39, greatly exceeding the coefficient of kinetic friction (μ ₁ ) of the sole of the shoe of Comparative Example 1 of 0.30. Therefore, it can be said that the sole of the shoe of Example 1 can withstand not only immediately after starting to stand up with strength, but also after that. In fact, when walking on the ice surface while wearing the shoes with the soles of Example 1, there was a feeling that the soles of the shoes firmly caught the ice surface during the period from landing on the ice surface to falling off. Therefore, when the shoes having the soles of the shoes of Example 1 were worn, they could walk with the same feeling as when walking on a dry road surface without any special care. When the shoes having the shoe soles of Example 1 were worn, it was possible to run on the ice surface or repeatedly jump sideways on the ice surface.

Subsequently, the measurement results of the ice surface in a state where water is formed on the surface will be described. FIG. 10 is a graph showing the results of measuring the change in friction coefficient on the ice surface in a state where water is present on the surface of the shoe sole of Example 1. FIG. 11 is a graph showing the results of measuring the change in the coefficient of friction for the ice surface in a state in which water is present on the surface of the shoe sole of Comparative Example 1.

It can be seen that the maximum coefficient of static friction (μ ₀ ) of the sole of the shoe of Example 1 on the ice surface with water on the surface is 0.31 from the peak (P ₀ ) value of the graph of FIG. 10 . Further, the coefficient of kinetic friction (μ ₁ ) of the sole of the shoe of Example 1 on the ice surface with water on the surface is 0.20 by calculating the average value of the range (R ₀ ) of the graph in FIG. 10 . Similarly, if the maximum static friction coefficient (μ ₀ ) and dynamic friction coefficient (μ ₁ ) of the sole of the shoe of Comparative Example 1 on the ice surface with water on the surface are obtained from the graph shown in FIG. 11, the maximum static friction coefficient ( μ ₀ ) is 0.41, and the coefficient of kinetic friction (μ ₁ ) is 0.10. These results are summarized in Table 2 below.

Maximum coefficient of static friction (μ ₀ ) Coefficient of dynamic friction (μ ₁ ) Example 1 0.31 0.20 Comparative Example 1 0.41 0.10

Looking at 'Comparative Example 1' in Table 2, the shoe sole of Comparative Example 1 has a dynamic friction coefficient (μ ₁ ) that is significantly smaller than the maximum static friction coefficient (μ ₀ ), and has a dynamic coefficient of dynamic friction for the maximum static friction coefficient (μ ₀ ). It can be seen that the ratio of the coefficient of friction (μ ₁ ) (μ ₁ / μ ₀ ) is only about 0.24. Therefore, it can be said that the sole of the shoe of Comparative Example 1 exhibits excellent sliding resistance immediately after starting to stand on the ice surface in a state where water is formed on the surface, but thereafter it tends to become slippery rapidly.

In contrast, looking at 'Example 1' in Table 2, the shoe sole of Example 1 has a dynamic friction coefficient (μ ₁ ) smaller than the maximum static friction coefficient (μ ₀ ), but the maximum static friction coefficient (μ ₀ ) The ratio (μ ₁ / μ ₀ ) of the coefficient of kinetic friction (μ ₁ ) to the shoe was about 0.64, greatly exceeding the μ ₁ / μ ₀ of 0.24 of the sole of the shoe of Comparative Example 1 under the same conditions. In addition, the coefficient of kinetic friction (μ ₁ ) of the sole of the shoe of Example 1 is 0.20 even on an ice surface with water on the surface, which is twice the coefficient of kinetic friction (μ ₁ ) of the sole of the shoe of Comparative Example 1 under the same conditions. reached Therefore, the shoe sole of Example 1 is superior to the shoe sole provided with the shoe sole of Comparative Example 1, which is evaluated to have the best sliding resistance against ice among the shoe soles currently on the market, even when water is formed on the surface. It can be seen that excellent performance is exhibited.

10: shoe sole body (outsole part) 11: water discharge path
20: protrusion for non-slip 21: concave portion
22: stepped portion 23: water drain hole
30: midsole part 31: midsole body
32: soft midsole part D ₀ : outer diameter of protrusion for non-slip
D ₁ : Diameter of water drain hole H ₀ : Height of protrusion for non-slip
H ₁ : height of the stepped part
W ₀ : Gap width between adjacent non-slip protrusions
W ₁ : width of step

Claims (8)

A shoe sole, characterized in that the coefficient of kinetic friction against the ice surface is greater than the maximum coefficient of static friction against the ice surface.
According to claim 1,
The sole of a shoe with a coefficient of kinetic friction against the ice surface of 0.25 or more and less than 0.7.
According to claim 1,
A plurality of non-slip protrusions, the lower surface of which serves as a ground contact surface, are formed downward,
On the lower surface of each non-slip protrusion, a recessed portion is formed in the shape of a trigger,
A shoe sole in which a stepped portion is annularly formed on an inner circumferential surface of each concave portion.
According to claim 3,
A shoe sole in which rows of protrusions composed of a plurality of non-slip protrusions are disposed along the width direction of the shoe sole at predetermined intervals in the width direction of the shoe sole, and a plurality of rows are arranged at predetermined intervals in the front-back direction of the shoe sole. .
According to claim 3,
A shoe sole provided with a water drainage hole for sucking up water entering the concave portion when the bottom surface of the non-slip projection is grounded and discharging it around the sole of the shoe.
According to claim 1,
A shoe sole provided with a midsole portion made of a material lower in hardness than the shoe sole body on the upper surface side.
Shoes provided with the shoe sole according to any one of claims 1 to 6.
An anti-slip member, characterized in that the coefficient of kinetic friction with respect to the ice surface is greater than the maximum coefficient of static friction with respect to the ice surface.

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