JP7411401B2 - footwear sole - Google Patents

Description

The present invention relates to a footwear sole forming the bottom surface of footwear.

Footwear soles, such as shoe soles, that constitute the bottom surface of footwear are required to have various performances depending on the type of footwear.
For example, the soles of commuting shoes are required to be able to bend and deform flexibly in the front-rear direction so that the user can walk comfortably for long periods of time. In addition, in order to prevent locomotive syndrome, it is important to form the arch of the foot during childhood, so soles that can flexibly deform in the front-back direction are required for the soles of shoes for infants. It will be done.
In order to meet the above requirements, various improvements have been made to groove patterns provided on the bottom surface of footwear soles.

For example, Patent Document 1 discloses that a center land portion is provided in the widthwise central portion of the bottom surface of the sole by a pair of vertical grooves and extends in the front-rear direction, and a plurality of center land portions are arranged in the front-rear direction by a plurality of width-direction grooves. A shoe sole is described that has a structure that is divided into sections to increase flexibility in the front-back direction.

International Publication No. 2010/137068

However, when the center land part is divided into multiple parts lined up in the front-rear direction by a plurality of widthwise grooves, as in the conventional sole mentioned above, it is possible to obtain flexibility in the front-rear direction, but the sole is Twisting around the directional axis is likely to occur, and there is room for improvement in this respect.

An object of the present invention is to provide a footwear sole that can suppress twisting while ensuring flexibility in the front-rear direction.

The gist of the present invention is as follows.

(1) A footwear sole constituting the bottom surface of the footwear,
a center land portion that extends continuously from the front end to the rear end of the bottom surface;
a pair of side land portions provided on both sides of the center land portion in the width direction with a vertical groove in between;
The center land portion has at least one constricted portion that is widest at the rear end and narrows from both the front and rear sides,
The bottom surface,
A rear foot corresponding to the heel of the foot,
a midfoot region corresponding to the arch of the sole of the foot;
When divided into a forefoot portion corresponding to the part of the sole of the foot closer to the toe than the arch,
A footwear sole characterized in that the constricted portion is provided at least in the midfoot portion .

( 2 ) In the pair of side land portions,
a plurality of front outward grooves each extending diagonally forward so that one end is connected to the longitudinal groove and the other end is connected to the outer peripheral edge of the bottom surface on the front side of the one end;
A plurality of grooves each having one end connected to the longitudinal groove, the other end connected to the outer peripheral edge of the bottom surface on the rear side of the one end, and extending diagonally rearward so as to intersect at least one of the front outward grooves. The footwear sole according to (1 ) above, wherein the footwear sole is provided with a rear outward groove.

( 3 ) The bottom surface,
A rear foot corresponding to the heel of the foot,
a midfoot region corresponding to the arch of the sole of the foot;
When divided into a forefoot portion corresponding to the part of the sole of the foot closer to the toe than the arch,
The footwear sole according to ( 2 ) above, wherein a plurality of the front outward grooves and a plurality of the rear outward grooves are provided at least in the midfoot portion.

( 4 ) The bottom surface,
A rear foot corresponding to the heel of the foot,
a midfoot region corresponding to the arch of the sole of the foot;
When divided into a forefoot portion corresponding to the part of the sole of the foot closer to the toe than the arch,
The footwear sole according to ( 2 ) or ( 3 ) above, wherein in the forefoot portion, the groove width of the front outward groove is larger than the groove width of the rear outward groove.

( 5 ) The bottom surface,
A rear foot corresponding to the heel of the foot,
a midfoot region corresponding to the arch of the sole of the foot;
When divided into a forefoot portion corresponding to the part of the sole of the foot closer to the toe than the arch,
The footwear sole according to any one of ( 2 ) to ( 4 ) above, wherein in the rear foot portion, the groove width of the rear outward groove is larger than the groove width of the front outward groove.

( 6 ) One of the front outward grooves, one of the rear outward grooves, and a portion of the longitudinal groove are each curved and connected to each other, so that the center land portion is connected to the center land portion from the outer peripheral edge side of the bottom surface. The footwear sole according to any one of ( 2 ) to ( 5 ) above, which forms a chevron-shaped groove that is convex toward the side.

( 7 ) The average width of each side land portion is 1.5 to 3 of the average width of the center land portion.
．． The footwear sole according to any one of (1) to ( 6 ) above, which is 0 times.

According to the present invention, it is possible to provide a footwear sole that can suppress twisting while ensuring flexibility in the front-rear direction.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the sole which is one embodiment of this invention.

Hereinafter, a shoe sole (footwear sole) 1 that is an embodiment of the present invention will be described in detail with reference to the drawings.

A shoe sole 1 as a footwear sole shown in FIG. 1 constitutes a bottom surface 2 of a shoe, which is footwear.
The shoes provided with the sole 1 may be various types of shoes, such as shoes for infants and shoes for commuting (leather shoes). In this embodiment, the sole 1 is used for shoes for infants.

Generally, a shoe includes a sole part 3 disposed on the back side of the foot, and an upper part (not shown) supported by the sole part 3 and covering the front side of the foot. It is provided on the lower surface and constitutes the sole surface 2 of the shoe. The sole 2 of the shoe is the part that comes into contact with the ground, road surface, floor surface, etc. when the wearer of the shoe walks.

Note that the footwear sole of the present invention can also be applied to a bottom of footwear other than shoes, such as sandals.

The sole 1 shown in FIG. 1 is for a right foot shoe. Since the sole of the shoe for the right foot and the sole of the shoe for the left foot are symmetrical to each other, only the sole 1 of the shoe for the right foot will be described below.

The sole 1 has a center land portion 10 and a pair of side land portions 13 and 14 provided on both sides of the center land portion 10 in the width direction with longitudinal grooves 11 and 12 in between.

The center land portion 10 is defined between a pair of vertical grooves 11 and 12, and extends from the front end 2a of the bottom surface 2 to the rear end 2b. The pair of vertical grooves 11 and 12 each penetrate the bottom surface 2 in the front-rear direction, and are open to the outside of the bottom surface 2 on the front end 2a side and the rear end 2b side of the bottom surface 2.
Here, the side of the bottom surface 2 corresponding to the toe side of the sole of the foot is the front, the side corresponding to the heel side of the sole of the foot is the rear, and the line extending from the front to the rear at the longest part of the bottom surface 2 is the bottom surface 2. When the axis L is the front end of the axis L and the outer periphery of the bottom 2, the front end 2a of the bottom 2 is the front end 2a of the bottom 2, and the rear intersection of the axis L and the outer rim of the bottom 2 is the bottom 2. Let it be the rear end 2b. Further, the width direction of the bottom surface 2 is perpendicular to the axis L.

The center land portion 10 extends continuously from the front end 2a to the rear end 2b without having a groove or a sipe (cut). Therefore, the center land portion 10 can come into contact with the ground or road surface in the entire portion between the front end 2a and the rear end 2b when walking or the like. The center land portion 10 extends with a width including the axis L over the entire range in the front-rear direction between the front end 2a and the rear end 2b.

The center land portion 10 has the widest width at the rear end 2b of the bottom surface 2. Here, the width of the center land portion 10 is the width in the direction perpendicular to the axis L.

The center land portion 10 decreases in width from the rear end 2b toward the front, and then extends toward the front end 2a while increasing and decreasing the width, and has a constricted portion 10a between the front end 2a and the rear end 2b. Provided in at least one location. The narrowed portion 10a is a narrowed portion where the width of the center land portion 10 becomes narrower from both the front side and the rear side. In this embodiment, the center land portion 10 includes narrow portions 10a at nine locations. In FIG. 1, the narrowest portion of each constricted portion 10a is indicated by a broken line.
More specifically, the longitudinal grooves 11 and 12 each have a plurality of curved portions that are convex from the outer peripheral edge side of the bottom surface 2 toward the center land portion 10 side (inward in the width direction) in the front-rear direction. It has a continuous shape, and the apex position of the curved portion of the vertical groove 11 and the apex position of the curved portion of the vertical groove 12 are shifted from each other back and forth, so that the center land portion 10 has nine constricted portions 10a. are arranged side by side in an irregular arrangement. The center land portion 10 can be curved and deformed in the front-rear direction more easily in the portion where the constricted portion 10a is provided than in other portions.
Note that the bending deformation of the center land portion 10 or the sole 1 in the front-rear direction means that the portion of the center land portion 10 or the sole 1 corresponding to the front end 2a is closer to the bottom surface 2 than the portion corresponding to the rear end 2b. This means that all or part of the center land portion 10 or the sole 1 is deformed so as to be curved so as to be displaced in the vertical direction.

As described above, in the sole 1 of the present embodiment, the center land portion 10 is provided on the bottom surface 2 and extends continuously from the front end 2a to the rear end 2b, and at least one part of the center land portion 10 is provided with a constricted portion. 10a, even if the center land portion 10 that extends continuously from the front end 2a to the rear end 2b is provided on the bottom surface 2, the center land portion 10 can be easily moved in the front-rear direction at the narrowed portion 10a. The flexibility of the sole 1 in the front-rear direction can be increased by allowing the sole 1 to be curved and deformed. In addition, since the center land portion 10 is configured to extend continuously from the front end 2a to the rear end 2b of the bottom surface 2 without being divided in the front-rear direction by grooves or sipes (cuts), the center land portion 10 2, the torsional rigidity in the torsional direction about the axis L can be increased. Therefore, according to the sole 1 of this embodiment, twisting can be suppressed while ensuring flexibility in the front-rear direction.
In addition, the sole 1 of the present embodiment has flexibility in the front-rear direction and is configured to suppress twisting, so that a wearer wearing shoes equipped with the sole 1 can walk, etc. At this time, the sole 1 is flexibly curved and deformed in the front-rear direction with twisting suppressed, thereby promoting the formation of an arch in the wearer's foot. As described above, the sole 1 of the present embodiment can promote arch formation of the wearer's feet and prevent locomotive syndrome.
Furthermore, according to the sole 1 of the present embodiment, it is possible to suppress twisting of the sole 1 during walking, etc., so that the shoe provided with the sole 1 is suppressed from losing its shape. be able to.

In the sole 1 of the present embodiment, the sole 2 is provided with the center land portion 10 that extends continuously from the front end 2a to the rear end 2b, so that the sole 10 is separated in the front-rear direction by grooves or sipes (cuts). The abrasion resistance of the sole 1 can be improved compared to a configuration including a plurality of land parts.
Furthermore, in the sole 1 of the present embodiment, the center land portion 10 has a shape that is widest at the rear end 2b of the sole 2, where wear is likely to occur due to walking, etc., so that the wear resistance of the sole 1 is improved. It can be increased further.

In the present embodiment, the sole 1 includes a bottom surface 2, a rear foot portion 2A corresponding to the heel of the sole, a midfoot portion 2B corresponding to the arch of the sole, and a portion of the sole closer to the toe than the arch of the foot. In the case where the foot is divided into a forefoot portion 2C corresponding to the forefoot portion 2C, it is preferable that the constricted portion 10a is provided at least in the middle foot portion 2B. In this embodiment, two of the nine constricted portions 10a are provided in the midfoot portion 2B.

Here, the boundary between the rear foot part 2A and the middle foot part 2B is located on the outside of the bottom surface 2 in the width direction (the right side in the width direction for the right foot, and the left side in the width direction for the left foot). It is defined by a straight line that passes through the rear end side inflection point P1, where the outer peripheral edge extending outward from the end 2b in an outwardly convex shape inflects inwardly and is perpendicular to the axis L. . Further, the boundary between the middle foot part 2B and the forefoot part 2C is inflected on the outside in the width direction of the bottom surface 2 so that the outer peripheral edge extending from the front end 2a in an outwardly convex shape becomes inwardly convex. It is assumed that it is defined by a straight line passing through the front end side inflection point P2 and perpendicular to the axis L.

By providing the constricted portion 10a at least in the midfoot portion 2B in this way, the flexibility of the sole 1 in the front-rear direction can be increased in the portion corresponding to the arch of the sole. Therefore, when a wearer wearing shoes equipped with the sole 1 walks, etc., the sole 1 is made to be able to curve and deform more flexibly in the front-back direction at the part corresponding to the arch of the sole of the foot. , can further promote arch formation of the foot. Thereby, the sole 1 can be made to be able to more effectively prevent locomotive syndrome.

In this embodiment, the sole 1 has a configuration in which a pair of side land portions 20 and 30 are provided with a plurality of front outward grooves 21 and 31 and a plurality of rear outward grooves 22 and 32, respectively. It is preferable that In this embodiment, the side land portion 20 is provided with six front outward grooves 21 and five rear outward grooves 22, and the side land portion 30 is provided with seven front outward grooves 31 and 5. A book rear outward facing groove 32 is provided.

The six front outward grooves 21 provided in the side land portion 20 extend obliquely forward so that one end thereof is connected to the longitudinal groove 11 and the other end is connected to the outer peripheral edge of the bottom surface 2 on the front side of the end. It is extending. Note that the six front outward grooves 21 are arranged at intervals from each other in the front-rear direction. Further, the six front outward grooves 21 are each opened to the outside of the bottom surface 2 at the outer peripheral edge of the bottom surface 2 .
In this embodiment, the six front outward grooves 21 each have a groove width that gradually increases from one end to the other end, and are slightly curved so as to be convex toward the front side.

The five rear outward grooves 22 provided in the side land portion 20 each have one end connected to the longitudinal groove 11, the other end connected to the outer peripheral edge of the bottom surface 2 on the rear side of the end, and at least one It extends diagonally rearward so as to intersect with the front outward groove 21 of. Note that the five rear outward grooves 22 are arranged at intervals from each other in the front-rear direction. Moreover, the four rear outward grooves 22 other than the rear outward groove 22 on the most front side are each open to the outside of the bottom surface 2 at the outer peripheral edge of the bottom surface 2 .
In this embodiment, among the five rear outward grooves 22, the three rear outward grooves 22 on the front side have substantially constant groove widths between one end and the other end, and It is slightly curved so that it is convex on the side. On the other hand, the two rear outward grooves 22 each have a groove width that gradually increases from one end to the other end, and are slightly curved so as to be convex toward the rear.

Similarly, each of the seven front outward grooves 31 provided in the side land portion 30 has one end connected to the vertical groove 12 and the other end connected to the inner outer peripheral edge of the bottom surface 2 on the front side of the end. Extends diagonally forward. Note that the seven front outward grooves 31 are arranged at intervals from each other in the front-rear direction. Moreover, the seven front outward grooves 31 are each opened to the outside of the bottom surface 2 at the inner outer peripheral edge of the bottom surface 2 .
In this embodiment, each of the seven front outward grooves 31 gradually increases in groove width from one end to the other end, and is slightly curved so as to be convex toward the front side.

The five rear outward grooves 32 provided in the side land portion 30 each have one end connected to the longitudinal groove 12, the other end connected to the inner outer peripheral edge of the bottom surface 2 on the rear side of the end, and at least one It extends diagonally rearward so as to intersect with the front outward groove 31 of. Note that the five rear outward grooves 32 are arranged at intervals from each other in the front-rear direction. Furthermore, the five rearward outward grooves 32 are each opened to the outside of the bottom surface 2 at the inner outer peripheral edge of the bottom surface 2.
In this embodiment, among the five rear outward grooves 32, the frontmost rear outward groove 32 and the two rear outward grooves 32 from the rear side each extend from one end to the other end. The width of the groove gradually increases toward the rear, and the groove is slightly curved so as to be convex toward the rear. The other two rear outward grooves 32 each have a substantially constant groove width between one end and the other end, and are slightly curved so as to be convex toward the rear side.

In this way, by providing the pair of side land portions 20 and 30 with a plurality of front outward grooves 21 and 31 and a plurality of rear outward grooves 22 and 32, the side land portions The portions 20, 30 may be provided with grooves in the form of a diagonal grid. As a result, when a wearer wearing shoes equipped with the sole 1 walks, etc., the sole 1 easily deforms into a shape that matches the deformation of the arch of the wearer's foot. Arch formation can be further promoted. Therefore, the sole 1 can be made to more effectively prevent locomotive syndrome.

In this embodiment, the sole 1 preferably has a configuration in which a plurality of front outward grooves 21, 31 and a plurality of rear outward grooves 22, 32 are provided at least in the midfoot portion 2B. . With this configuration, when a wearer wearing shoes equipped with the sole 1 walks, etc., the sole 1 more effectively deforms into a shape that matches the deformation of the arch in the portion corresponding to the arch of the foot. By making it possible to more effectively promote arch formation of the wearer's feet. Therefore, the sole 1 can be made to more effectively prevent locomotive syndrome.

In this embodiment, the sole 1 preferably has a structure in which the width of the front outward grooves 21 and 31 is larger than the groove width of the rear outward grooves 22 and 32 in the forefoot portion 2C.
With such a configuration, the drainage performance of the sole 1 can be improved and high anti-slip properties can be achieved. That is, when walking while wearing shoes to which the sole 1 is applied, the forefoot portion 2C gradually touches the wet road surface etc. from the rear end 2b side toward the front end 2a side as the walking motion progresses. When contacting the shoes, water from the road surface, etc. is taken into the front outward grooves 21, 31, flows diagonally forward along the front outward grooves 21, 31, and is discharged to the outside of the forefoot portion 2C of the sole 1. . In this manner, the front outward grooves 21 and 31 having relatively wide groove widths can improve the drainage performance of the sole 1 when the forefoot portion 2C comes into contact with a wet road surface or the like during walking or the like.
On the other hand, by making the rear outward grooves 22 and 32 relatively narrow, the drainage performance of the sole 1 when the forefoot portion 2C comes into contact with a wet road surface is improved as described above, and the forefoot It is possible to suppress foreign objects such as stones from getting caught in the groove provided in the portion 2C.

In the present embodiment, it is preferable that the sole 1 is configured such that the groove width of the rear outward grooves 22 and 32 is larger than the groove width of the front outward grooves 21 and 31 in the rear foot portion 2A.
With such a configuration, the drainage performance of the sole 1 on a downhill slope can be improved. That is, when walking downhill while wearing shoes to which the sole 1 is applied, when the rear foot 2A comes into contact with a wet road surface, water from the road surface etc. flows into the rear outward groove. 22, 32, flows obliquely backward along the rear outward grooves 22, 32, and is discharged to the outside of the rear foot portion 2A of the sole 1. In this way, the rear outward grooves 22 and 32, which have relatively wide groove widths, can improve the drainage performance of the sole 1 when the rear foot 2A comes into contact with a wet road surface, etc. when walking downhill. can.
On the other hand, by making the front outward grooves 21 and 31 relatively narrow, the drainage performance of the sole 1 is improved when the rear foot 2A comes into contact with a wet road surface as described above, and It is possible to suppress foreign objects such as stones from getting caught in the grooves provided in the hindfoot portion 2A.

In addition, in this embodiment, since the front outward groove 21 and the rear outward groove 22 have a curved shape, when walking on a wet road surface as described above, the front outward groove 21 or the rear outward groove 22 is curved. By promoting the discharge of water taken into the directional grooves 22 to the outside, the drainage performance or slip resistance of the sole 1 can be further improved.

Further, in this embodiment, the front outward grooves 21 in the forefoot portion 2C are formed in a shape whose groove width gradually increases diagonally forward, and the rear outward grooves 22 in the rear foot portion 2A are formed in a shape that gradually widens diagonally forward. Since the grooves are formed in such a shape that the groove width gradually widens, as described above, when walking on a wet road surface, etc., the water taken into the front outward groove 21 or the rear outward groove 22 can be discharged to the outside. is further promoted, and the drainage performance or slip resistance of the sole 1 can be further improved.

In this embodiment, the sole 1 has one front outward groove 21, 31, one rear outward groove 22, 32, and part of the vertical grooves 11, 12 in the side land portions 20, 30. , respectively, may be curved and connected to each other to form a chevron-shaped groove that is convex from the outer peripheral edge side of the bottom surface 2 toward the center land portion 10 side.
In the present embodiment, in the side land portion 20, the front outward groove 21 at the frontmost position and the rear outward groove 22 at the third position from the front are connected to each other through the second curved portion from the front of the vertical groove 11. are connected to each other to form a chevron groove, and the second front outward groove 21 from the front and the fourth rear outward groove 22 from the front are connected to each other through the third curved portion from the front of the vertical groove 11. are connected to each other to form a chevron-shaped groove, and the third front outward groove 21 from the front and the fifth rear outward groove 22 from the front are connected to each other through the fourth curved portion from the front of the vertical groove 11. The grooves are connected to each other to form a chevron groove. Further, in the side land portion 30, the front outward groove 31 at the frontmost and the rear outward groove 32 at the second from the front are connected to each other via the second curved portion from the front of the vertical groove 12. to form a chevron-shaped groove, and the second front outward groove 31 from the front and the third rear outward groove 32 from the front are connected to each other via the third curved portion from the front of the vertical groove 12. The third front outward groove 31 from the front and the fourth rear outward groove 32 from the front are connected to each other via the fourth curved portion from the front of the vertical groove 12. to form a chevron-shaped groove, and the fourth front outward groove 31 from the front and the fifth rear outward groove 32 from the front are connected to each other via the fifth curved portion from the front of the vertical groove 12. It forms a chevron groove.
With such a configuration, the shape of the constricted portion 10a provided in the center land portion 10 can be made into a shape whose width increases and decreases smoothly, thereby increasing the durability of the center land portion 10.
Moreover, the sole 1 having the above-mentioned configuration and effects can be made more aesthetically pleasing.

In this embodiment, the sole 1 is preferably configured such that the average width of each side land portion 20, 30 is 1.5 to 3.0 times the average width of the center land portion 10.
If the width of the center land portion 10 is too wide compared to the width of the side land portions 20, 30, the area where the front outward grooves 21, 31 and the rear outward grooves 22, 32 can be provided is relatively small. This makes it difficult to ensure the drainage performance of the sole 1, and the rigidity of the center land portion 10 increases, reducing the flexibility of the sole 1 in the front-rear direction. On the other hand, if the width of the center land portion 10 is too narrow relative to the width of the side land portions 20 and 30, the twist prevention effect of the center land portion 10 will be reduced, and the wear resistance will also be reduced.
On the other hand, by making the average width of each of the side land parts 20 and 30 1.5 to 3.0 times the average width of the center land part 10, the sole 1 can improve its drainage performance and flexibility in the front and rear direction. It is possible to obtain a high level of well-balanced performance of elasticity, anti-twisting properties, and abrasion resistance.

In the above embodiment, the sole 1 may be formed from a rubber composition containing a rubber component and a filler.
Each component of the rubber composition preferable for forming the sole 1 will be explained below.

The rubber component preferably contains diene rubber, for example, from the viewpoint of obtaining excellent reinforcing properties and abrasion resistance.
The rubber component can be composed of 100% of the diene rubber, but can also contain rubbers other than diene rubber. In addition, from the viewpoint of being able to obtain excellent reinforcing properties and abrasion resistance, the content of diene rubber in the rubber component is preferably 30% by mass or more, and more preferably 40% by mass or more. , more preferably 50% by mass or more.

Here, the diene rubber includes natural rubber (NR), butadiene rubber (BR), polyisoprene rubber (IR), styrene butadiene rubber (SBR), styrene isoprene butadiene rubber (SIBR), chloroprene rubber (CR), Examples include acrylonitrile butadiene rubber (NBR).
Furthermore, examples of non-diene rubber include ethylene propylene diene rubber (EPDM), ethylene propylene rubber (EPM), butyl rubber (IIR), and the like.
Note that these rubbers may be used alone or as a blend of two or more. Further, these rubbers may be unmodified rubber or modified rubber.

Among the diene rubbers, the rubber component preferably contains polyisoprene rubber in an amount of 5% by mass or more, more preferably 8% by mass or more. This is because the reinforcing properties of the rubber composition can be further improved.
In addition, from the viewpoint of maintaining the slip resistance (grip property) of the sole 1 at a high level, the content of the polyisoprene rubber in the rubber component is preferably 30% by mass or less, and 20% by mass or less. It is more preferable that

The rubber composition preferably contains at least butadiene rubber in the rubber component. From the viewpoint of improving wear resistance, the rubber component preferably contains butadiene rubber in an amount of 20% by mass or more, more preferably 25% or more.
The content of the butadiene rubber in the rubber component is preferably 40% by mass or less, more preferably 35% by mass or less.

The rubber composition preferably contains at least styrene-butadiene rubber in the rubber component. From the viewpoint of improving slip resistance (wet grip properties) on wet road surfaces, the rubber component preferably contains styrene-butadiene rubber in an amount of 50% by mass or more, more preferably 55% or more.
In addition, from the viewpoint of maintaining wear resistance at a high level, the content of the styrene-butadiene rubber in the rubber component is preferably 75% by mass or less, and more preferably 70% by mass or less.

Examples of fillers included in the rubber composition include silica, carbon black, aluminum hydroxide, clay, alumina, talc, mica, kaolin, glass balloons, glass beads, calcium carbonate, magnesium carbonate, magnesium hydroxide, magnesium oxide, and magnesium oxide. Examples include titanium, potassium titanate, barium sulfate, and the like.

As the filler, for example, silica and carbon black can be used. If the filler is silica and carbon black, it can be used in the black sole 1. Moreover, silica alone can also be used as the filler. If the filler is silica, it can be used in the collar sole 1.

Silica can be appropriately selected depending on the purpose, and includes, for example, wet silica (hydrated silicic acid), dry silica (anhydrous silicic acid), calcium silicate, aluminum silicate, and the like. Silica may be used alone or in combination of two or more.

The BET specific surface area of silica may be selected as appropriate, for example, from 40 to 350 ^{m 2} /g, from 80 to 300 m ² /g, or from 150 to 280 m ² /g.

The BET specific surface area refers to a specific surface area determined by the BET method, and refers to a value measured in accordance with ASTM D4820-93.

The proportion of silica in the filler may be adjusted as appropriate, and is, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more with respect to the total mass of the filler. Further, for example, the proportion of silica in the filler is 100% by mass or less, less than 100% by mass, 95% by mass or less, 90% by mass or less, or 80% by mass or less, based on the total mass of the filler.

Carbon blacks include, for example, high, medium or low structure carbon blacks such as SAF, ISAF, ISAF-HS, IISAF, N339, HAF, FEF, GPF, SRF grades. Carbon black may be used alone or in combination of two or more.

The BET specific surface area of carbon black may be selected as appropriate, for example, from 40 to 350 m ² /g or from 80 to 200 m ² /g.

The proportion of carbon black in the filler may be adjusted as appropriate, for example, 1% by mass or more, 2% by mass or more, 3% by mass or more, 4% by mass or more, 5% by mass or more, based on the total mass of the filler. The content is 10% by mass or more, and 20% by mass or more. For example, the proportion of carbon black in the filler is 100% by mass or less, less than 100% by mass, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, based on the total mass of the filler. , 10% by mass or less, or 5% by mass or less.

The blending amount of the filler may be adjusted as appropriate, and is, for example, 60 to 80 parts by mass based on 100 parts by mass of the rubber component.

In addition to the rubber components and fillers, the rubber composition contains ingredients commonly used in the rubber industry, such as styrene-alkylene block copolymers, thermoplastic resins, softeners, vulcanization accelerators, and silane coupling agents. , a vulcanizing agent, a glycerin fatty acid ester, an anti-aging agent, a vulcanization accelerator, an organic acid compound, etc. can be appropriately selected and contained.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

For example, in the embodiment described above, the constricted portions 10a are provided at nine locations on the center land portion 10, but the constricted portions 10a may be provided at at least one location. Further, the location where the constricted portion 10a is provided can be changed in various ways.

The number and shape of the front outward grooves 21, 31 and the rear outward grooves 22, 32 provided on the side land portions 20, 30 can also be varied. In this case, the shapes of the vertical grooves 11, 12 can be changed in various ways according to the number and shape of the front outward grooves 21, 31 and the rear outward grooves 22, 32.
Alternatively, a configuration may be adopted in which the front outward grooves 21, 31 and the rear outward grooves 22, 32 are not provided in the side land portions 20, 30.

1: Sole (footwear sole), 2: Bottom surface, 2a: Front end, 2b: Rear end, 2A: Rear foot, 2B: Midfoot, 2C: Forefoot, 3: Sole, 10: Center land area , 10a: Narrow portion, 11: Vertical groove, 12: Vertical groove, 20: Side land portion, 21: Front outward groove, 22: Rear outward groove, 30: Side land portion, 31: Front outward groove, 32 : Rear outward groove, L: Axis, P1: Posterior inflection point, P2: Front inflection point

Claims (7)

A footwear sole forming the bottom surface of footwear,
a center land portion that extends continuously from the front end to the rear end of the bottom surface;
a pair of side land portions provided on both sides of the center land portion in the width direction with a vertical groove in between;
The center land portion has at least one constricted portion that is widest at the rear end and narrows from both the front and rear sides,
The bottom surface,
A rear foot corresponding to the heel of the foot,
a midfoot region corresponding to the arch of the sole of the foot;
When divided into a forefoot portion corresponding to the part of the sole of the foot closer to the toe than the arch,
A footwear sole characterized in that the constricted portion is provided at least in the midfoot portion . on the pair of side land portions,
a plurality of front outward grooves each extending diagonally forward so that one end is connected to the longitudinal groove and the other end is connected to the outer peripheral edge of the bottom surface on the front side of the one end;
A plurality of grooves each having one end connected to the longitudinal groove, the other end connected to the outer peripheral edge of the bottom surface on the rear side of the one end, and extending diagonally rearward so as to intersect at least one of the front outward grooves. 2. The footwear sole of claim 1 , further comprising: a rear outwardly directed groove. The bottom surface,
A rear foot corresponding to the heel of the foot,
a midfoot region corresponding to the arch of the sole of the foot;
When divided into a forefoot portion corresponding to the part of the sole of the foot closer to the toe than the arch,
The footwear sole according to claim 2 , wherein a plurality of the front outward grooves and a plurality of the rear outward grooves are provided at least in the midfoot portion. The bottom surface,
A rear foot corresponding to the heel of the foot,
a midfoot region corresponding to the arch of the sole of the foot;
When divided into a forefoot portion corresponding to the part of the sole of the foot closer to the toe than the arch,
The footwear sole according to claim 2 or 3 , wherein in the forefoot portion, a groove width of the front outward groove is larger than a groove width of the rear outward groove. The bottom surface,
A rear foot corresponding to the heel of the foot,
a midfoot region corresponding to the arch of the sole of the foot;
When divided into a forefoot portion corresponding to the part of the sole of the foot closer to the toe than the arch,
The footwear sole according to any one of claims 2 to 4 , wherein in the rear foot portion, the groove width of the rear outward groove is larger than the groove width of the front outward groove. One of the front outward grooves, one of the rear outward grooves, and a part of the vertical groove are each curved and connected to each other, so that they extend from the outer peripheral edge side of the bottom surface to the center land portion side. The footwear sole according to any one of claims 2 to 5 , which has a chevron-shaped groove that is convex toward the bottom. The footwear sole according to any one of claims 1 to 6 , wherein the average width of each of the side land portions is 1.5 to 3.0 times the average width of the center land portion.

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