JP6881759B2 - Sole, shoes and non-slip members - Google Patents

Description

The present invention relates to a sole having excellent anti-slip resistance to an ice surface, a shoe having the sole, and a non-slip member to which the technique of the sole is applied.

Various types of soles with improved slip resistance (slip resistant soles) have been proposed so far.

For example, Patent Document 1 includes a sole provided at the lower part of a shoe body and a suction cup having a conical recess, and the sole is provided with a large number of suction cups to be integrated. A non-slip structure (claim 1 of the same document) is described. In Patent Document 2, the anti-slip structure described above allows a suction cup having adhesive force to catch the ground, and not only on dry asphalt, soil, lawn, etc., but also on wet ground, snowy roads, and frozen roads. It is also described that the anti-slip effect can be obtained even on the ground where the oily liquid is spilled (paragraph 0016 of the same document).

Further, Patent Document 2 describes a slip-resistant sole having a plurality of ground contact protrusions formed on the ground contact side surface of the base portion at predetermined intervals in the length direction of the base portion, and each of the above ground contact surfaces. The convex portion has a V-shaped cross section, an inclined reinforcing portion is formed at the base portion with the base portion, and is formed by an elastic polymer having a JIS-A hardness of 45 to 80 degrees at 20 ° C. A slip-resistant sole (claim 1 of the same document) is described. Patent Document 2 also describes that the above-mentioned slip-resistant sole makes it possible to walk stably even on a slippery floor surface or the like (paragraph 0021 of the same document). ..

Jitsuto No. 3096646 Re-table 2006-003740 Gazette

However, the slip-resistant soles so far have not always been able to exhibit excellent slip resistance. This is because, with conventional slip-resistant soles, the frictional force (the frictional force that the sole receives from the walking surface; the same applies hereinafter) momentarily occurs immediately after the shoe begins to be stepped on, such as when the shoe sole begins to kick the walking surface. This is because it had the property of reaching a peak and then rapidly reducing the frictional force. A wearer of shoes with a sole having such characteristics has the illusion that the slip resistance (friction force) immediately after starting to step on is maintained, and unconsciously kicks the walking surface with a strong force. Tends to continue. Even in such a case, when walking on a walking surface with good conditions such as walking on a dry road surface, it is unlikely that the person will slip and fall, but walking on a walking surface with poor conditions such as walking on an ice surface. When doing so, it tends to slip and fall easily.

The present invention has been made to solve the above-mentioned problems, and it is possible to keep the stepping effect not only immediately after the start of stepping but also after that, and it is possible to maintain a walking surface in poor conditions such as when walking on an ice surface. It provides a sole that can exhibit excellent slip resistance even when walking. It is also an object of the present invention to provide a shoe provided with this sole. Furthermore, it is also an object of the present invention to provide a non-slip member to which the technique of this sole is applied.

The above-mentioned problem is characterized in that the coefficient of dynamic friction with respect to the ice surface is larger than the maximum coefficient of static friction with respect to the ice surface (in the present specification, unless otherwise specified, the lowermost portion of the sole (out). The sole part) is called the "sole".)
Is solved by providing.

Here, the "dynamic friction coefficient with respect to the ice surface" and the "maximum static friction coefficient with respect to the ice surface" refer to the friction coefficient measured by a measuring method based on ISO13287 "slip resistance test of shoe sole", and specifically. Refers to the coefficient of friction measured in steps 1 to 6 below. However, the coefficient of friction is measured 10 times in total, with the following steps 1 to 6 as one cycle, and the maximum static friction coefficient obtained in a total of 5 measurements from the 6th measurement to the 10th measurement. The average value and the average value of the coefficient of dynamic friction are adopted as the formal maximum coefficient of static friction and the coefficient of dynamic friction, respectively.
[Step 1]
Horizontal ice surface (ice surface. The ice surface in a state where no floating water to be maintained at 0 ℃ the surface is supported by the slidable state in the horizontal direction by the force F ₂ to be described later.) On the Install the soles on the ice. The sole shall be held by a jig or the like so as not to move in the horizontal direction.
[Step 2]
A vertical downward force F ₁ (500N) is applied to the upper surface of the sole to press the sole against the ice surface.
[Step 3]
_{While continuing to apply the force F 1} of (2) above to the sole, a horizontal force F ₂ is applied to the ice surface to gradually increase the _{force F 2.}
[Step 4]
Force from the start of application of a force F ₂ in step 3, the force F ₂ to the ice surface starts sliding in the horizontal direction was measured, the highest peak value appeared during this time (the maximum value of the force F ₂₎ The _{value divided by F 1} is defined as the "maximum static friction coefficient with respect to the ice surface".
[Step 5]
_{The force F 2} is increased until the speed at which the ice surface slides in the horizontal direction reaches 300 mm / s.
[Step 6]
_{The force F 2} when the speed at which the ice surface slides in the horizontal direction stabilizes at 300 mm / s is measured, and the average value _{of the force F 2 during this period (0.3 seconds have passed since the force F 2} was started to be applied). the value obtained by dividing the average value) until the end of 0.6 seconds at a force F ₁ from the "coefficient of dynamic friction ice surface."

In this way, by making the coefficient of dynamic friction with respect to the ice surface larger than the maximum coefficient of static friction with respect to the ice surface, the sole can be kept effective not only immediately after the start of stepping but also thereafter. It becomes possible to do. Therefore, it is possible to provide a shoe sole capable of exhibiting excellent slip resistance even when walking on a walking surface under poor conditions such as when walking on an ice surface.

In the sole of the present invention, the specific value of the "dynamic friction coefficient with respect to 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 slippery with respect to the ice surface so that it can be walked more safely. The "dynamic friction coefficient with respect to the ice surface" is more preferably 0.30 or more, further preferably 0.35 or more, and optimally 0.37 or more. In the sole of the present invention, the "dynamic friction coefficient with respect to the ice surface" can be set to 0.39 or more.

The specific structure of the sole of the present invention is not particularly limited as long as it exhibits a characteristic that the coefficient of dynamic friction with respect to the ice surface is larger than the maximum coefficient of static friction with respect to the ice surface. This characteristic is that, for example, a plurality of non-slip protrusions whose lower end surface serves as a ground contact surface are formed downward, and a mortar-shaped recess is formed on the lower end surface of each non-slip protrusion, and each recess is formed. It can be expressed by adopting a structure in which a step portion is formed in an annular shape on the inner peripheral surface of the above. At this time, it is preferable that the sole is provided with a drain hole for sucking up the water that has entered the recess when the lower end surface of the anti-slip protrusion touches the ground and discharging the water around the sole. As a result, it is possible to easily maintain excellent slip resistance even on a walking surface under adverse conditions such as when walking on an ice surface on which water floats.

In the sole of the present invention, a row of protrusions composed of a plurality of non-slip protrusions arranged along the width direction of the sole with a predetermined interval in the width direction of the sole is arranged in the front-rear direction of the sole. It is preferable to arrange them in a plurality of rows at predetermined intervals. In other words, it is preferable to align the front and rear positions of the non-slip protrusions forming the same protrusion row (row in the width direction of the sole). For example, this corresponds to the case where the anti-slip protrusions 20 are arranged in a grid pattern in the width direction and the front-rear direction of the sole. As a result, it becomes possible to prevent the gaps between the adjacent anti-slip protrusions from being clogged with snow or the like, and it is possible to further improve the slip resistance of the sole. When the anti-slip protrusions 20 are arranged in a grid pattern in the width direction and the front-rear direction of the sole, the reason why the gaps between the adjacent anti-slip protrusions are less likely to be clogged with snow or the like will be described later.

In the sole of the present invention, it is also preferable to provide a midsole portion made of a material having a hardness lower than that of the sole body (outsole portion) on the upper surface side thereof. This makes it possible to more preferably express the above-mentioned characteristics (characteristics that the treading can be continued not only immediately after the start of treading but also after that).

The sole of the present invention is not particularly limited in its use, and can be provided for various types of shoes. Among them, commuting shoes for cold regions, school shoes, athletic shoes, work shoes and the like can be suitably provided. Further, it can be suitably provided for work shoes in a skating rink, work shoes in a freezer, and the like. The sole of the present invention may be provided in a state of being integrally formed with the shoe, or may be provided in a state of being detachable from an existing shoe.

Further, the technique of "making the coefficient of dynamic friction with respect to the ice surface larger than the maximum coefficient of static friction with respect to the ice surface" used in the sole of the present invention can be applied to non-slip members other than the sole. For example, it can be applied to a non-slip member of a mat laid on a floor surface, a road surface, a loading platform, etc., a non-slip member of a cane tip, a non-slip member of gloves, and the like. This makes it possible to provide a mat, a cane tip, gloves, etc. having excellent slip resistance to the ice surface.

As described above, according to the present invention, the treading can be continued not only immediately after the start of treading but also after that, even when walking on a walking surface under poor conditions such as when walking on an ice surface. It becomes possible to provide a sole capable of exhibiting excellent slip resistance. It will also be possible to provide shoes with this sole. Further, it becomes possible to provide a non-slip member to which this sole technology is applied.

It is a bottom view which showed the state which saw the sole of the shoe of 1st Embodiment from the lower surface side. It is the bottom view which looked at the sole of the shoe of 1st Embodiment from the lower surface side, and is the enlarged view which showed the state which A part in FIG. 1 of the said sole was enlarged. It is a perspective view which showed the enlarged state of one non-slip protrusion in the sole of the 1st Embodiment. It is the bottom view which looked at the sole of the shoe sole of the 2nd Embodiment from the lower surface side, and is the enlarged view which showed the part corresponding to the part A in FIG. 1 of the said sole. It is a perspective view which showed the enlarged state of one non-slip protrusion in the sole of the second embodiment. It is the bottom view which looked at the sole of the third embodiment from the lower surface side, and is the enlarged view which showed the part corresponding to the part A in FIG. 1 of the said sole enlarged. It is a perspective view which showed the enlarged state of one non-slip protrusion in the sole of the third embodiment. It is a graph which showed the result of having measured the change of the friction coefficient with respect to the ice surface in the state where water does not float on the surface about the sole of Example 1. It is a graph which showed the result of having measured the change of the friction coefficient with respect to the ice surface in the state where water does not float on the surface about the sole of Comparative Example 1. It is a graph which showed the result of having measured the change of the friction coefficient with respect to the ice surface in the state which water floated on the surface about the sole of Example 1. It is a graph which showed the result of having measured the change of the friction coefficient with respect to the ice surface in the state which water floated on the surface about the sole of Comparative Example 1. It is a bottom view which showed the state which saw the sole of the shoe of 4th Embodiment from the lower surface side. It is the bottom view which looked at the sole of the shoe sole of 4th Embodiment from the lower surface side, and is the enlarged view which showed the state which expanded the part A in FIG. 12 of the said sole. It is a figure which showed the state of the sole when walking with the shoe provided with the sole of the 4th Embodiment, as seen from the side of the shoe. It is a figure which showed the example of the arrangement of the anti-slip protrusion which has the same effect as the sole of the fourth embodiment. It is a figure which showed the state which saw the shoe provided with the sole of the 5th Embodiment from the side of the shoe. It is a bottom view which showed the state which the sole of the 6th Embodiment was seen from the lower surface side. It is a figure which showed the state which the shoe provided with the sole of the 6th Embodiment was seen from the side of the shoe.

A preferred embodiment of the present invention will be described in more detail with reference to the drawings. In the following, for convenience of explanation, the present invention will be described by taking a shoe sole as an example. However, the configuration described below is not limited to the case where it is used for soles, and can be suitably used for other non-slip members such as mats, cane tips, and gloves. Further, in the following, the soles of a total of six embodiments from the first embodiment to the sixth embodiment will be described. However, the technical scope of the present invention is not limited to these embodiments, and various structures in which the coefficient of dynamic friction with respect to the ice surface is larger than the maximum coefficient of static friction with respect to the ice surface can be adopted. Further, in the following, the sole of the first embodiment will be mainly described, but the configuration described in the sole of the first embodiment is not contradictory to the sole of the other embodiment. , It can also be suitably adopted in the sole of the other embodiment. Similarly, the configurations described in the soles of the second embodiment and the third embodiment are preferably adopted in the soles of the first embodiment as long as the configurations are not inconsistent with the soles of the first embodiment. can do.

1. 1. The sole of the first embodiment is a bottom view showing a state in which the sole of the first embodiment is viewed from the lower surface side. FIG. 2 is a bottom view of the sole of the first embodiment as viewed from the lower surface side, and is an enlarged view showing an enlarged state of a portion A in FIG. 1 of the sole. FIG. 3 is a perspective view showing an enlarged state of one non-slip protrusion on the sole of the first embodiment. FIG. 3A shows the entire non-slip protrusion, and FIG. 3B shows a state in which the non-slip protrusion in FIG. 3A is broken in a plane B parallel to the yz plane. Shown.

As shown in FIG. 1, the sole of the first embodiment has a large number of anti-slip protrusions 20 formed downward on the lower surface side of the sole body 10 (outsole portion). The thickness of the sole body 10 is usually 2 to 30 mm. The lower end surface (the end surface on the negative side in the z-axis direction) of the anti-slip protrusion 20 is a ground contact surface (a surface in contact with the walking surface). In the sole of the first embodiment, the anti-slip protrusion 20 is provided over the entire lower surface of the sole body 10, but the area of the sole body 10 that does not easily come into contact with the walking surface, that is, the anti-slip property. Anti-slip protrusions 20 are provided in areas that are difficult to contribute to improvement (for example, the portion shown by the shaded hatching in FIG. 1 (the portion of the sole body 10 that overlaps the arch, the peripheral edge of the sole body 10, etc.)). You can also avoid it. In the following, the region on the lower surface of the sole body 10 where the anti-slip protrusion 20 is not provided is referred to as a “protrusion non-forming region”, and the region on the sole body 10 where the anti-slip protrusion 20 is provided is referred to as a “projection forming region”. I may call it.

The number of anti-slip protrusions 20 provided 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 provided on the sole body 10 will be small, and the maximum static friction coefficient and dynamic friction coefficient of the sole will be at a required level. It may be difficult to raise it. Therefore, the number of anti-slip protrusions 20 per unit area (when there is a protrusion non-forming region on the lower surface of the sole body 10, the value in the protrusion forming region; the same applies hereinafter) is usually 0.5. / Cm ² or more. The number of anti-slip protrusions 20 per unit area ^{is preferably 0.8 pieces / cm 2} or more, and more preferably 1 piece / cm ² or more.

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

_{The width W 0} (FIG. 2) of the gap between the adjacent non-slip protrusions 20 is also not particularly limited. However, if the width W ₀ of the gap is made too narrow, there is a risk that pebbles, sand, or the like may easily clog the gap between the adjacent anti-slip protrusions 20. Further, when the shoe sole is stretched, the anti-slip protrusion 20 is compressed in the height direction and spreads in the radial direction, and the adjacent anti-slip protrusions 20 interfere with each other, which is desired. There is a risk that it will be difficult to obtain anti-slip performance. Therefore, the gap width W _{0 (the minimum value when the gap width W 0} differs depending on the location. The same applies in the following 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, an excessively large width W ₀ of the gap, it becomes difficult to increase the number of anti-slip protrusions 20 per unit area, the desired anti-slip performance is likely to be difficult to obtain. Therefore, the gap width W _{0 (the maximum value when the gap width W 0} differs depending on the location. The same applies in the following 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 formed integrally with the sole body 10. As the molding material of the sole, various rubbers, elastomers and the like conventionally used for the outsole portion of the sole can be adopted. More specifically, it is selected from the group consisting of synthetic rubber, natural rubber, thermoplastic styrene-butadiene rubber (SBS), styrene-based thermoplastic elastomer (SIS), ethylene-vinyl acetate copolymer (EVA), polyurethane and polyvinyl chloride. A material composed of one or more of the above elastic polymers and a rubber compounding agent can be used as a molding material for shoe soles.

The hardness of the sole (hardness of the outsole portion) varies depending on the molding material of the sole and is not particularly limited. However, if the outsole portion of the sole is too soft, it may be difficult to maintain the strength of the anti-slip protrusion 20. Therefore, when the outsole portion of the sole is made of rubber, the hardness of the outsole portion (value measured by an A hardness tester; hereinafter the same in the case of rubber) is usually 10 degrees or more. It is said that it is preferably 20 degrees or more, more preferably 30 degrees or more, and even more preferably 35 degrees or more. When the outsole portion of the sole is formed of EVA, the hardness of the outsole portion (value measured by an E hardness tester; hereinafter the same in the case of EVA) is 10 degrees or more. It is preferably 20 ° C or higher, more preferably 30 ° C or higher, and even more preferably 30 ° C or higher. On the other hand, if the outsole portion of the sole is too hard, the anti-slip protrusion 20 is less likely to be elastically deformed, and it is difficult to follow the walking surface, which may make it difficult to obtain the desired anti-slip performance. In addition, the cushioning property of the sole is lowered, which may make the shoe uncomfortable to wear. Therefore, when the outsole portion of the sole is made of rubber, the hardness of the outsole portion is preferably 70 degrees or less, more preferably 60 degrees or less, and further preferably 50 degrees or less. preferable. When the outsole portion of the sole is formed of EVA, the hardness of the outsole portion is usually 70 degrees or less, preferably 60 degrees or less, more preferably 50 degrees or less, and more preferably 40 degrees. The following is more preferable.

By the way, each anti-slip protrusion 20 is usually formed in a columnar shape. In the sole of the first embodiment, as shown in FIG. 3A, the anti-slip protrusion 20 is formed in a columnar shape. However, the shape of the anti-slip protrusion 20 is not formed in a columnar shape, but may be a polygonal columnar shape such as a triangular columnar shape, a square columnar shape, or a hexagonal columnar shape, an elliptical columnar shape, or a combination thereof. Further, in the sole of the first embodiment, the outer diameter D ₀ (FIG. 3A) of the non-slip protrusion 20 is constant regardless of the height, but the outer circumference of the non-slip protrusion 20 is constant. _{The outer diameter D 0} of the non-slip protrusion 20 may be changed depending on the height, such as forming the surface in a tapered shape.

_{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 anti-slip protrusion 20 differs depending on the molding material of the anti-slip protrusion 20 and the like. , Not particularly limited. However, if the ratio H ₀ / D ₀ is too small, the anti-slip protrusion 20 may have a flat shape, making it difficult to obtain the desired anti-slip performance. Therefore, the ratio H ₀ / D ₀ is usually 0.1 or more. The ratio H ₀ / D ₀ is preferably 0.2 or more, and more preferably 0.3 or more. On the other hand, if the ratio H ₀ / D ₀ is too large, the non-slip protrusion 20 becomes elongated, and it may be difficult to maintain high strength of the non-slip protrusion 20. Therefore, the ratio H ₀ / D ₀ is usually set to 3 or less. The ratio H ₀ / D ₀ is preferably 2 or less, and more preferably 1 or less.

_{The outer diameter D 0} (FIG. 3A) of the non-slip protrusion 20 is usually 2 mm or more, preferably 5 mm or more, and more specifically, 7 mm or more. Further, the outer diameter D ₀ of the anti-slip protrusion 20 is usually 30 mm or less, preferably 20 mm or less, and more specifically, 15 mm or less. On the other hand, the height H ₀ (FIG. 3A) of the anti-slip protrusion 20 is usually 1 mm or more, preferably 2 mm or more, and more specifically, 3 mm or more. .. _{Further, the height H 0} of the anti-slip protrusion 20 is usually 15 mm or less, preferably 10 mm or less, and more specifically, 7 mm or less.

Further, in the sole of the first embodiment, as shown in FIG. 3, a mortar-shaped recess 21 having a circular cross section is formed on the lower end surface of each of the anti-slip protrusions 20. Therefore, the anti-slip protrusion 20 can be attracted to the walking surface like a suction cup. The inner peripheral surface of the recess 21 may be formed smoothly, but in the sole of the first embodiment, the step portion 22 is formed in an annular shape on the inner peripheral surface of the recess 21. For this reason, it is possible to make it hard to slip not only immediately after starting to step on the sole of the shoe but also after that. Further, by forming the step portion 22 in an annular shape, it is possible to develop the slip resistance in all directions. The sole of the first embodiment has excellent anti-slip performance not only when it is stepped on in the front-rear direction but also when it is stepped on in the lateral direction (for example, when it repeatedly jumps sideways).

When the step portions 22 are provided on the inner peripheral surface of the recess 21, the number of the step portions 22 is not particularly limited. However, if the number of steps of the step portion 22 is small, the step portion 22 is likely to disappear due to wear of the anti-slip protrusion 20. In addition, it may be difficult to obtain the desired anti-slip performance. Therefore, the number of steps of the step portion 22 is preferably two or more steps, and more preferably three or more steps. On the other hand, there is no particular upper limit to the number of steps of the step portion 22, but if the number of steps of the step portion 22 is too large, it may be difficult to form the anti-slip protrusion 22. Therefore, the number of stages of the stage portion 22 is usually 10 or less. The number of steps of the step portion 22 is preferably 7 steps or less, and more preferably 5 steps or less.

_{The ratio H 1} / W _{1 of the height H 1} (FIG. 3 (b)) of the step 22 to the width W ₁ of the step 22 (FIG. 3 (b)) is not particularly limited. However, if the ratio H ₁ / W ₁ is too small, the inclination of the inner peripheral surface of the recess 21 is inevitably gentle, and the anti-slip protrusion 20 is less likely to stick to the walking surface. Therefore, the ratio H ₁ / W ₁ is usually 0.1 or more. The ratio H ₁ / W ₁ is preferably 0.3 or more, and more preferably 0.5 or more. On the other hand, if the ratio H ₁ / W ₁ is too large, the step portion 22 will be located deep from the lower end surface of the anti-slip protrusion 20, and the corner portion of the step portion 22 will not easily come into contact with the walking surface. There is a risk that it will be difficult to obtain the desired anti-slip performance. Therefore, the ratio H ₁ / W ₁ is usually set to 3 or less. The ratio 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 _{step portion 22 varies depending on the outer diameter D 0} of the non-slip protrusion 20 and the number of steps of the step portion 22, but is usually 0.3 mm or more, and is preferably 0.3 mm or more. It can be 0.4 mm or more, and more specifically, 0.5 mm or more. Further, the width W ₁ of the step portion 22 is usually 5 mm or less, preferably 3 mm or less, and more specifically, 1 mm or less. When two or more steps 22 are provided, the width W ₁ of the steps 22 may be set equally in all the steps 22 or may be changed depending on the steps. On the other hand, the height H ₁ of the step portion 22 (FIG. 3 (b)) _{varies depending on the height H 0} of the anti-slip protrusion 20 and the number of steps of the step portion 22, but is usually 0.1 mm or more, which is preferable. , 0.2 mm or more, and more specifically, 0.3 mm or more. Further, the height H ₁ of the step portion 22 is usually 3 mm or less, preferably 2 mm or less, and more specifically, 1 mm or less. When two or more steps 22 are provided, the height H ₁ of the steps 22 may be set equally in all the steps 22 or may be changed depending on the steps.

Further, in the sole of the first embodiment, as shown in FIG. 3, a drain hole 23 is provided at the center of the recess 21 in each of the non-slip protrusions 20. The drain hole 23 is provided so as to communicate with the water discharge path 11 provided in the sole body 10. The water discharge path 11 is provided in a state of communicating with the outer peripheral surface (side surface) of the shoe sole body 10. Therefore, when walking on a walking surface in which water is floating, the water that has entered the recess 22 is sucked up by the drain hole 23 and then discharged to the outside of the sole body 10 through the water discharge path 11. It has become. Therefore, the anti-slip performance of the sole can be maintained even when walking on a walking surface on which water floats. How the water discharge path 11 is provided is not particularly limited, but in the sole of the first embodiment, the water discharge path is formed by forming a concave groove formed on the upper surface (the surface on the positive side in the z-axis direction) of the sole body 10. It is set to 11. As will be described later, a midsole portion (not shown) is fixed to the upper surface side of the sole body 10 (outsole portion), so that the upper side of the water discharge path 11 (recessed groove) is blocked by the midsole portion. It will be in a state of being lost.

_{The diameter D 1} of the drain hole 23 _{(FIG. 3A) varies depending on the diameter D 0} of the non-slip protrusion 20, the number of steps of the step portion 22, the width W ₁ of the step portion 22, and the like, and is not particularly limited. _{However, if the diameter D 1} of the drain hole 23 is too small, the drain hole 23 may be easily clogged with pebbles, sand, or the like. Therefore, the diameter D ₁ of the drain hole 23 is usually 0.5 mm or more. The diameter D ₁ of the 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 drain hole 23 is too large, the outer diameter D 1} of the anti-slip protrusion 20 is inevitably also large, and it becomes difficult to increase the number of anti-slip protrusions 20 per unit area. There is a risk that it will be difficult to obtain the desired anti-slip performance. Therefore, the diameter D ₁ of the drain hole 23 is usually 20 mm or less. The diameter D ₁ of the drain hole 23 is preferably 10 mm or less, and more preferably 7 mm or less.

In the sole of the first embodiment described above, the coefficient of dynamic friction with respect to the ice surface (referred to as μ ₁ ) is larger than the maximum coefficient of static friction with respect to the ice surface (referred to as μ _0). .. The ratio mu _{1 /} mu ₀ of the dynamic friction coefficient mu ₁ to the maximum static friction coefficient mu ₀ of an ice surface is not particularly limited as greater than 1, preferable to be 1.1 or more, if it is 1.2 or more More preferred. In the sole of the first embodiment, as will be described later, the ratio μ ₁ / μ ₀ on the ice surface can be set to 1.3 or more. There is no particular upper limit to the ratio μ ₁ / μ _{0 , but in reality, the ratio μ 1} / μ _{0 on} the ice surface is considered to be limited to about 1.5 to 2.

The specific value of the _{coefficient of dynamic friction μ 1 with} respect to the ice surface is also not particularly limited. However, if the coefficient of kinetic friction μ ₁ is too small, it cannot be said that the slip resistance is excellent. Therefore, the coefficient of dynamic friction with respect to the ice surface μ ₁ is usually set to 0.3 or more. As described above, the coefficient of dynamic friction with respect to the ice surface μ ₁ is preferably 0.25 or more, more preferably 0.30 or more, further preferably 0.35 or more, and optimally 0.37 or more. is there. In the sole of the first embodiment, as will be described later, the coefficient of dynamic friction with respect to the ice surface μ ₁ can be set to 0.39 or more. The higher the coefficient of kinetic friction μ ₁ , the more preferable it is, but in reality, it is considered difficult to set it to 0.7 or more on the ice surface.

By the way, when the sole of the first embodiment is provided in an actual shoe, it is also preferable to provide a midsole portion (not shown) on the upper surface side of the sole body 10. The hardness of the midsole portion is usually lower than the hardness of the sole body 10. As a result, it is possible to more preferably develop the characteristic that the treading can be continued not only immediately after the start of treading but also after that, 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, elastomers and the like conventionally used for the midsole portion of the sole can be adopted. More specifically, it is selected from the group consisting of synthetic rubber, natural rubber, thermoplastic styrene-butadiene rubber (SBS), styrene-based thermoplastic elastomer (SIS), ethylene-vinyl acetate copolymer (EVA), polyurethane and polyvinyl chloride. A material composed of one or more of the above elastic polymers and a rubber compounding agent can be used as a molding material for the midsole portion. Among them, EVA is suitable as a molding material for the midsole portion.

The specific value of the hardness of the midsole portion is not particularly limited as long as it is lower than the hardness of the outsole portion, but it is at least 5 to 10 degrees or more, and in some cases, about 15 to 20 degrees or more than the hardness of the outsole portion. It is preferable to lower it. For example, when the midsole portion is formed by EVA, the hardness of the midsole portion (value measured by an E hardness tester; hereinafter the same in the case of EVA) is preferably 50 degrees or less, preferably 40 degrees or less. It is more preferable, and it is more preferable that the temperature is 30 degrees or less. The lower limit of the hardness of the midsole portion is not particularly limited, but if the midsole portion is made too soft, the strength of the midsole portion may not be maintained. Therefore, when the midsole portion is formed by EVA, the hardness of the midsole portion is preferably 5 degrees or more, more preferably 10 degrees or more, and further preferably 15 degrees or more.

2. The sole of the second embodiment Next, the sole of the second embodiment will be described. FIG. 4 is a bottom view of the sole of the second embodiment as viewed from the lower surface side, and is an enlarged view showing a portion corresponding to the portion A in FIG. 1 of the sole. FIG. 5 is a perspective view showing an enlarged state of one non-slip protrusion on the sole of the second embodiment. FIG. 5 (a) shows the entire non-slip protrusion, and FIG. 5 (b) shows a state in which the non-slip protrusion in FIG. 5 (a) is broken in a plane B parallel to the yz plane. Shown.

In the sole of the first embodiment described above, the anti-slip protrusions 20 are formed in a columnar shape, but in the sole of the second embodiment, as shown in FIGS. 4 and 5, the respective anti-slip protrusions 20 are formed. The protrusions 20 are formed in a square columnar shape. Along with this, in the sole of the second embodiment, the drain hole 23 is formed in a quadrangular cross section, and the recess 21 is also formed in a mortar shape with a quadrangular cross section. Further, the step portion 22 is formed in a square ring shape. By providing the square columnar anti-slip protrusions 20 in this way, the coefficient of dynamic friction with respect _{to the ice surface μ 1} can be made larger than the maximum coefficient of static friction μ _{0 with respect to the ice surface.}

The sole of the second embodiment has an advantage that the anti-slip protrusions 20 can be arranged more densely than the sole of the first embodiment. Further, since a large number of straight portions can be secured in the step portion 22, there is an advantage that the anti-slip performance in the direction perpendicular to the straight portion can be easily improved. As the configuration not particularly mentioned in the sole of the second embodiment, a configuration substantially similar to the sole of the first embodiment can be adopted.

3. 3. Sole of the third embodiment Next, the sole of the third embodiment will be described. FIG. 6 is a bottom view of the sole of the third embodiment as viewed from the lower surface side, and is an enlarged view showing a portion corresponding to the portion A in FIG. 1 of the sole. FIG. 7 is a perspective view showing an enlarged state of one non-slip protrusion on the 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 in FIG. 7 (a) is broken in a plane B parallel to the yz plane. Shown.

In the sole of the third embodiment, as shown in FIGS. 6 and 7, each anti-slip protrusion 20 is formed in a hexagonal columnar shape. Along with this, in the sole of the third embodiment, the drain hole 23 is formed in a hexagonal cross section, and the recess 21 is also formed in a mortar shape with a hexagonal cross section. Further, the step portion 22 is formed in a hexagonal ring shape. By providing the hexagonal columnar anti-slip protrusion 20 in this way, the coefficient of dynamic friction with respect _{to the ice surface μ 1} can be made larger than the maximum coefficient of static friction μ _{0 with respect to the ice surface.}

The sole of the third embodiment has an advantage that the anti-slip protrusions 20 can be densely arranged as in the sole of the second embodiment. Further, since a large number of straight portions can be secured in the step portion 22, there is an advantage that the anti-slip performance in the direction perpendicular to the straight portion can be easily improved. As the configuration not particularly mentioned in the sole of the third embodiment, a configuration substantially similar to the sole of the first embodiment or the sole of the second embodiment can be adopted.

4. Sole of the fourth embodiment Next, the sole of the fourth embodiment will be described. FIG. 12 is a bottom view showing a state in which the sole of the shoe sole of the fourth embodiment is viewed from the lower surface side. FIG. 13 is a bottom view of the sole of the fourth embodiment as viewed from the lower surface side, and is an enlarged view showing an enlarged state of part A in FIG. 12 of the sole. FIG. 14 is a view showing a state of the sole when walking with the shoe provided with the sole of the fourth embodiment as viewed from the side of the shoe.

As shown in FIGS. 12 and 13, the sole of the fourth embodiment has the respective non-slip protrusions 20 formed in a square columnar shape. The non-slip protrusion 20 on the sole of the fourth embodiment has the same form as the non-slip protrusion 20 (FIG. 5) on the sole of the second embodiment described above. However, in the sole of the second embodiment, as shown in FIG. 4, the non-slip protrusions 20 adjacent to each other in the width direction (x-axis direction) of the sole are half in the front-rear direction (y-axis direction) of the sole. As shown in FIG. 13, in the sole of the fourth embodiment, the non-slip protrusions 20 adjacent to each other in the width direction (x-axis direction) of the sole are arranged in a state of being shifted by pitch. It is arranged so as not to shift in the front-back direction (y-axis direction) of.

In other words, in the sole of the fourth embodiment, as shown in FIG. 12, along the width direction (x-axis direction) of the sole with a predetermined interval in the width direction (x-axis direction) of the sole. The protrusion rows L (each broken line shown in FIG. 12 corresponds to one protrusion row L) composed of a plurality of non-slip protrusions arranged are spaced apart from each other in the front-rear direction (y-axis direction) of the sole. It is in a state of being arranged in multiple rows with a space between them. By arranging the non-slip protrusions 20 in a grid pattern in this way, it is possible to further improve the slip resistance of the sole. In particular, even when walking on a snow surface, the anti-slip protrusion 20 can exert a desired anti-slip action.

This is because when snow or the like is clogged in the gap between the adjacent anti-slip protrusions 20, the anti-slip protrusions 20 are less likely to be elastically deformed, and the bottom surface of the shoe sole is also flattened (the angle at which the sole stands on the walking surface). Since there is no part), the sole may become slippery. In this regard, in the sole of the fourth embodiment, as shown in FIG. 14, even if the gap between the adjacent non-slip protrusions 20 (the portion α shown by the shaded hatching in the figure) is clogged with snow or the like. during walking when such kick ground or time of landing the sole, a state where the ground portion around curved in the sole, the width W _{0 'of} the gap α-slip projections 20 adjacent in the longitudinal direction, initially This is because the gap α penetrates in the width direction of the sole, so that the snow or the like clogged in the gap α can be easily removed.

Therefore, in the sole of the fourth embodiment, the width W ₀ (FIG. 13) of the gap between the adjacent non-slip protrusions 20 can be made narrower than that of the sole of the second embodiment. Therefore, in the sole of the fourth embodiment, the anti-slip protrusions 20 can be densely arranged, and more excellent anti-slip performance can be exhibited. As the sole not particularly mentioned in the sole of the fourth embodiment, substantially the same configuration as the sole of the first to third embodiments can be adopted.

By the way, as described in FIG. 13, the above-mentioned effect (the effect of making it easier for snow or the like clogged in the gap α of the non-slip protrusions 20 adjacent to each other in the front-rear direction to come off) is that the non-slip protrusions 20 are attached to the sole of the shoe. Even if they are not arranged in a grid pattern in the width direction and the front-rear direction, they are played as long as the front-rear positions of the non-slip protrusions 20 forming the same protrusion row L (row in the width direction of the sole) are aligned. FIG. 15 is a diagram showing an example of arrangement of anti-slip protrusions 20 having the same effect as the sole of the fourth embodiment. FIG. 15 is an enlarged view of the portion corresponding to the portion A in FIG. In the sole shown in FIG. 15, the position of the non-slip protrusion 20 forming a certain protrusion row L and the non-slip protrusion 20 forming another protrusion row L adjacent to the protrusion row L in the front-rear direction. Is deviated by half a pitch in the width direction (x-axis direction) of the sole. The above-mentioned effect is also exhibited in the sole in which the anti-slip protrusion 20 is arranged as shown in FIG.

5. Sole of the fifth embodiment Next, the sole of the fifth embodiment will be described. FIG. 16 is a diagram showing an example of a shoe provided with a sole according to a fourth embodiment as 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 sole of the fifth embodiment, the form and arrangement of the anti-slip protrusion 20 are substantially the same as those of the sole of the fourth embodiment. However, in the sole of the fifth embodiment, as shown in FIG. 16, a soft midsole portion 32 is provided on the upper surface side of the sole body 10 (outsole portion). The hardness of the soft midsole portion 32 is lower than the hardness of the sole body 10 (outsole portion). As a result, it is possible to more preferably develop the characteristic that the treading can be continued not only immediately after the start of treading but also after that, in actual shoes. The molding material and hardness of the soft midsole portion 32 are the same as those described for the midsole portion in "1. Sole of the first embodiment" described above.

Further, in the 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 are the common sole body 10 (out). Although it was provided on the sole), in the sole of the fifth embodiment, as shown in FIG. 16, the non-slip protrusion 20 on the toe portion and the non-slip protrusion 20 on the heel portion are different sole bodies. It is provided on 10 (outsole). Therefore, the above-mentioned soft midsole portion 32 is also provided separately for the toe portion and the heel portion. The sole body 10 (outsole part) and soft midsole part 32 of the toe part, and the sole body 10 (outsole part) and soft midsole part 32 of the heel part are fixed to the common midsole body 31. Has been done.

As the sole not particularly mentioned in the sole of the fifth embodiment, substantially the same configuration as the sole of the first to fourth embodiments can be adopted.

6. Sole of the sixth embodiment Next, the sole of the sixth embodiment will be described. FIG. 17 is a bottom view showing a state in which the sole of the sixth embodiment is viewed from the lower surface side. FIG. 18 is a view showing a state in which the shoe provided with the sole of the sixth embodiment is viewed from the side of the shoe. FIG. 18 shows a state in which the periphery of the sole of the shoe is seen through.

In the sole of the sixth embodiment, the form of the anti-slip protrusion 20 is substantially the same as that of the sole of the second embodiment, the fourth embodiment and the fifth embodiment. Further, as shown in FIG. 17, the sole of the sixth embodiment has a non-slip protrusion 20 on substantially the entire lower surface of the sole, and in this respect, the sole of the first embodiment and the sole of the first embodiment. It is almost the same. In addition, in the sole of the sixth embodiment, the anti-slip protrusions 20 are arranged in a grid pattern in the width direction and the front-rear direction of the sole, and in this respect, substantially the same as the sole of the fourth embodiment. It has become.

Further, as shown in FIG. 18, the sole of the sixth embodiment is the same as the sole of the fifth embodiment in that a soft midsole portion 32 is provided on the upper surface side of the sole body 10 (outsole portion). It is similar. However, in the sole of the fifth embodiment, as shown in FIG. 16, the sole body 10 (outsole portion) and the soft midsole portion 32 are provided separately by the toe portion and the heel portion, respectively. On the other hand, in the sole of the sixth embodiment, as shown in FIG. 18, the sole body 10 (outsole portion) and the soft midsole portion 32 are common to the toe portion and the heel portion, respectively.

As the sole not specifically mentioned in the sole of the sixth embodiment, substantially the same configuration as the sole of the first to fifth embodiments can be adopted.

7. Measurement 7.1 Measurement method In order to confirm the anti-slip performance of the sole of the present invention, the sole of Example 1 belonging to the technical scope of the sole of the present invention was prepared, and the maximum static friction coefficient and the dynamic friction coefficient with respect to the ice surface were prepared. An experiment was conducted to measure. Further, in order to evaluate the slip resistance of Example 1, the soles of other companies that are evaluated to have the best slip resistance against the ice surface among the soles currently on the market (hereinafter, "Comparative Example 1"). The same measurement was performed for "sole"). The method for measuring the maximum static friction coefficient and the dynamic friction coefficient was performed in steps 1 to 6 described above. However, in step 1 above, the sole was installed on the ice surface where water was not floating on the surface, but here, in order to evaluate the anti-slip performance under more slippery conditions, water is applied to the surface. In addition to the case where the sole was installed on the ice surface in a non-floating state, the measurement was also performed in the case where the sole was installed on the surface in which water was floating on the surface.

The sole of the first embodiment corresponds to the sole of the first embodiment described above, and the anti-slip protrusion 20 is formed in a columnar shape. _{In the sole of Example 1, the width W 0} (FIG. 2) of the gap between the 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. ^{It is 2} . The outer diameter D ₀ (FIG. 3 (a)) of the anti-slip protrusion 20 is 8 mm, and the height H ₀ (FIG. 3 (a)) of the anti-slip protrusion 20 is 4 mm for anti-slip. the ratio _H 0 / _{D 0} of the height _{H 0} to the outer diameter _{D 0} of the projection 20 has a 0.5. Further, the number of steps of the step portion 22 is three, and the width W ₁ (FIG. 3 (b)) of the step portion 22 is 0.5 mm in each step portion 22, and the height H of the step portion 22 is H. ₁ (FIG. 3 (b)) is 0.3 mm in each step portion 22. Therefore, the ratio H ₁ / W ₁ of the height H _{1 to the width W 1} of the step portion 22 is 0.6. Further, the diameter D ₁ (FIG. 3 (a)) of the drain hole 23 is 3 mm. The hardness of the rubber used for the sole (outsole portion) is in the range of 35 to 50 degrees.

7.2 Measurement results First, the measurement results for the ice surface with no water floating on the surface will be described. FIG. 8 is a graph showing the results of measuring the change in the coefficient of friction of the sole of Example 1 with respect to the ice surface in a state where water does not float on the surface. FIG. 9 is a graph showing the results of measuring the change in the coefficient of friction of the sole of Comparative Example 1 with respect to the ice surface in a state where water does not float on the surface. The time on the horizontal axis in the graphs of FIGS. 8 and 9 represents the time from the start of applying the _{horizontal force F 2 to the ice surface in step 3 above.} The meaning of the horizontal axis of the graph is the same in FIGS. 10 and 11 described later.

_{From the value of the peak P 0} in the graph of FIG. 8, it can be seen that _{the maximum static friction coefficient μ 0} of the shoe sole of Example 1 with respect to the ice surface in a state where water is not floating on the surface is 0.29. _{Further, the coefficient of dynamic friction μ 1} of the shoe sole of Example 1 with respect to the ice surface in a state where water is not floating on the surface is 0.39 by obtaining the average value _{of the range R 0} in the graph of FIG. _{Similarly, when the maximum static friction coefficient μ 0} and the dynamic friction coefficient μ ₁ of the shoe sole of Comparative Example 1 with respect to the ice surface in a state where water is not floating on the surface are obtained from the graph shown in FIG. 9, the maximum static friction coefficient μ ₀ Is 0.39, and the coefficient of dynamic friction μ ₁ is 0.30. The results are summarized in Table 1 below.

Looking at the stage of "Comparative Example 1" in the above Table 1, the sole of Comparative Example 1, the dynamic friction coefficient mu ₁ has become smaller than the maximum static friction coefficient mu _0, the coefficient of dynamic friction with respect to the maximum static friction coefficient mu ₀ the ratio μ ₁ / μ ₀ of mu ₁ is found to be about 0.77. Therefore, it can be said that the sole of Comparative Example 1 exhibits excellent slip resistance immediately after starting to step on the ice surface, but tends to become slippery thereafter. Actually, when walking on the ice surface with the shoes equipped with the sole of Comparative Example 1, immediately after starting to step on the ice surface (immediately after landing on the walking surface or immediately after kicking the walking surface), the ice surface However, it tended to be slippery after that. For this reason, even when walking on the ice surface with shoes equipped with the sole of Comparative Example 1, which is evaluated to have the best anti-slip performance on the ice surface among those currently on the market, considerable caution is taken. I found that I needed to do it. Even if the shoes equipped with the soles of Comparative Example 1 were worn, it was difficult to run on the ice surface and repeatedly jump sideways on the ice surface.

On the other hand, looking at the stage of "Example 1" in Table 1 above, the sole of Example 1 has a coefficient of dynamic friction μ ₁ larger than the maximum coefficient of static friction μ _0, and the maximum coefficient of static friction μ the ratio mu ₁ / mu ₀ of the dynamic friction coefficient mu ₁ for _0, it can be seen that also is about 1.34. In addition, the kinematic friction coefficient μ ₁ of the sole of Example 1 is 0.39, which is much higher than _{the kinetic friction coefficient μ 1} of the sole of Comparative Example 1 of 0.30. Therefore, it can be said that the sole of the first embodiment can continue to be effective not only immediately after the start of the stepping but also thereafter. Actually, when walking on the ice surface with the shoes provided with the sole of Example 1, the feeling of firmly capturing the ice surface from the time the sole landed on the ice surface until the time when the sole was separated from the ice surface was felt. there were. Therefore, when the shoes provided with the soles of Example 1 were worn, it was possible to walk with the same feeling as when walking on a dry road surface without paying special attention. When the shoes provided with the soles of Example 1 were put on, it was possible to run on the ice surface and repeatedly jump sideways on the ice surface.

Next, the measurement results for the ice surface with water floating on the surface will be described. FIG. 10 is a graph showing the results of measuring the change in the coefficient of friction of the sole of Example 1 with respect to the ice surface in a state where water is floating on the surface. FIG. 11 is a graph showing the results of measuring the change in the coefficient of friction of the sole of Comparative Example 1 with respect to the ice surface in a state where water is floating on the surface.

_{From the value of the peak P 0} in the graph of FIG. 10, it can be seen that _{the maximum static friction coefficient μ 0} of the shoe sole of Example 1 with respect to the ice surface in which water is floating on the surface is 0.31. _{Further, the coefficient of dynamic friction μ 1} of the shoe sole of Example 1 with respect to the ice surface in a state where water is floating on the surface is 0.20 by obtaining the average value _{of the range R 0} in the graph of FIG. _{Similarly, when the maximum static friction coefficient μ 0} and the dynamic friction coefficient μ ₁ of the shoe sole of Comparative Example 1 with respect to the ice surface in which water is floating on the surface are obtained from the graph shown in FIG. 11, the maximum static friction coefficient μ ₀ is obtained. At 0.41, the coefficient of dynamic friction μ ₁ becomes 0.10. The results are summarized in Table 2 below.

Looking at the stage of "Comparative Example 1" in the above Table 2, the sole of Comparative Example 1, the dynamic friction coefficient mu ₁ has become considerably smaller than the maximum static friction coefficient mu _0, kinetic friction with respect to the maximum static friction coefficient mu ₀ It can be seen that the ratio μ ₁ / μ ₀ of the coefficient μ _{1 is only about 0.24.} For this reason, the sole of Comparative Example 1 exhibits excellent slip resistance immediately after it begins to step on the ice surface with water floating on the surface, but after that, it tends to become slippery rapidly. It can be said that.

On the other hand, looking at the stage of "Example 1" in Table 2 above, the sole of Example 1 has a coefficient of dynamic friction μ ₁ that is smaller than the maximum coefficient of static friction μ ₀ , but has a maximum coefficient of static friction. mu ratio mu ₁ / mu ₀ of the dynamic friction coefficient mu ₁ for _0, has a approximately 0.64, 0.24 ratio mu ₁ / mu ₀ in the sole of Comparative example 1 under the same conditions greatly exceeded by There is. In addition, the coefficient of dynamic friction μ ₁ of the sole of Example 1 is 0.20 even on an ice surface with water floating on the surface, and the coefficient of dynamic friction μ 1 of the sole of Comparative Example 1 under the same conditions. _It has reached twice the number of 1. Therefore, the sole of Example 1 is evaluated to have the best anti-slip performance against the ice surface among the soles currently on the market, even if the sole has water floating on the surface. It was found that the shoe sole provided with the sole of Comparative Example 1 exhibited outstanding anti-slip performance.

10 Sole body (outsole part)
11 Water discharge path 20 Anti-slip protrusion 21 Recess 22 Step part 23 Drain hole 30 Midsole part 31 Midsole body 32 Soft midsole part D ₀ Outer diameter of non-slip protrusion D ₁ Diameter of drain hole H _{0 For non-} slip Height of protrusion H Height of _1st step W ₀ Width of gap between adjacent non-slip protrusions W Width of _1st step

Claims (7)

A sole having a plurality of columnar anti-slip protrusions having a lower end surface as a ground contact surface, which are integrally formed downward with respect to the sole body in a state where there is a gap between adjacent non-slip protrusions. And
It is formed of rubber having a hardness of 30 to 60 degrees measured by an A hardness meter or an elastomer having a hardness of 30 to 60 degrees measured by an E hardness meter.
A mortar-shaped recess is formed on the lower end surface of each anti-slip protrusion.
By forming a plurality of step portions in an annular shape on the inner peripheral surface of each recess,
A sole characterized in that the coefficient of dynamic friction with respect to the ice surface is made larger than the maximum coefficient of static friction with respect to the ice surface.
The sole according to claim 1, wherein the coefficient of dynamic friction with respect to the ice surface is 0.25 or more.
A plurality of projection rows consisting of a plurality of anti-slip protrusions arranged along the width direction of the sole with a predetermined interval in the width direction of the sole are spaced apart from each other in the front-rear direction of the sole. The sole according to claim 1 or 2 arranged in a row.
The sole according to any one of claims 1 to 3, wherein a drain hole is provided for sucking up water that has entered the recess when the lower end surface of the anti-slip protrusion touches the ground and discharging the water around the sole.
The sole according to any one of claims 1 to 4, wherein a midsole portion made of a material having a hardness lower than that of the sole body is provided on the upper surface side thereof.
A shoe having a sole according to any one of claims 1 to 5.
A plurality of columnar anti-slip protrusions whose lower end surface is a ground contact surface are integrally formed downward with respect to the sole body in a state where there is a gap between adjacent anti-slip protrusions. It ’s a member,
It is formed of rubber having a hardness of 30 to 60 degrees measured by an A hardness meter or an elastomer having a hardness of 30 to 60 degrees measured by an E hardness meter.
A mortar-shaped recess is formed on the lower end surface of each anti-slip protrusion.
By forming a plurality of step portions in an annular shape on the inner peripheral surface of each recess,
A non-slip member characterized in that the coefficient of dynamic friction with respect to the ice surface is made larger than the maximum coefficient of static friction with respect to the ice surface.

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