JP5583874B1 - Shoe sole suitable for rough terrain - Google Patents

Abstract

  In the shoe sole in which a large number of first, second, and third cleats protruding from the base surface of the rubber outsole are disposed, the inner first cleat disposed on the inner ME of the foot of the front foot portion is obliquely rearward. The outer first cleat having an engagement surface directed outward and disposed on the outer side of the front foot part has an engagement surface directed obliquely rearward and disposed on the inner side of the middle foot part. The inner second cleat has an engagement surface that faces diagonally forward and outward, and the second outer cleat disposed outside the foot of the middle foot has an engagement surface that faces diagonally forward and the rear. The inner third cleat arranged on the inner side of the foot of the foot part has an engaging surface directed toward the outer side of the front side of the foot part, and the outer third cleat arranged on the outer side of the foot of the rear part of the foot part is an inner side of the front side of the diagonal part. An engagement surface directed toward the surface.

Description

The present invention relates to a sole for walking, raining and everyday shoes, in addition to a sole suitable for rough road surfaces such as trail running, mountain climbing, and cross-country. In the present invention, the rough road surface includes a muddy road surface, an inclined road surface, an uneven road surface, and the like.

  In general, in order to improve grip performance on rough road surfaces, it is effective to increase the amount of soil that cleat penetrates the road surface and scrapes when gripping. Therefore, it is important to consider the direction of the load applied to the cleat from the road surface and its projected area when gripping. However, conventionally, the direction of the load in the sole surface when walking on an inclined road surface is not sufficiently considered. In particular, an arch that does not contact the ground is often formed on the middle foot, and it seems that no cleat design has been made with sufficient grip.

JP2011-382A (summary) JP2009-233163A (Summary) JP2007-307377A (summary) JP2002-034609A (summary) JP09-075106A (Summary) JP07-136003A (Summary)

  Accordingly, an object of the present invention is to provide a shoe sole having excellent grip performance on an inclined road surface, particularly on an uneven road surface.

Prior to the description of the configuration of the present invention, the direction of the load in the sole surface on the inclined road surface will be described.

  The inventor first calculated the direction of main loads applied to the sole surface when walking (4 km / h) on an inclined road surface. An illustration of the direction of the load is shown in FIG. 11A. In FIG. 11A, the alternate long and short dash line and the solid line indicate the direction of the load mainly applied during walking down and climbing, respectively.

  As indicated by the alternate long and short dash line, a load is applied from the rear foot portion 5R toward the rear end of the middle foot portion 5M and the front foot portion 5F toward the rearward inner side ME and the outer side LA when walking down. On the other hand, as shown by a solid line, when climbing and walking, the front diagonal inner ME, the front diagonal outer LA, and the front at the front D1 with respect to the line MP connecting the MP joints of the forefoot 5F. It can be seen that a load is applied.

Consider the cause of such a load.
When climbing and walking, after the shoe sole touches down and before taking off, the foot dorsiflexes in the line MP connecting the MP joints, and in this dorsiflexed state, the part in front of the foot from the line MP clears the soil on the road surface. Scrape backwards. Therefore, a load having a vector toward the front D1 is generated. Furthermore, when the forefoot rotates around the mother ball in the direction in which the toes move outward, a load toward the outside LA of the oblique front D1 is generated in the outside LA of the foot, while in the inside ME of the foot It is estimated that a load toward the inner side ME of the front D1 is generated.

  On the other hand, when walking, the sole of the shoe is generally slightly bent and raised above the front D1 from the line MP connecting the MP joints. Therefore, when descending and walking, the part of the rear D2 from the line MP is grounded before the part of the front D1 from the line MP is grounded.

Here, the load applied from the outsole 5 to the road surface at the portion D2 behind the line MP is large on the long axis CL of the foot and in the vicinity of the main ball O1, and is small at the inner and outer edges of the outsole 5. In other words, considering the force from the outsole to the road surface when walking down, no force is applied to the outer periphery of the sole, so in addition to the force applied in the direction of sliding to the toe side, the force is applied in the direction of gathering at the center of the sole. It becomes a combined force. On the other hand, the direction of the force from the road surface to the outsole when walking down is opposite to the resultant force.
For this reason, as shown by the one-dot chain line in FIG. 11A, the load applied to the outsole 5 from the road surface is centered on the long axis CL and the main ball O1, and on the outer side LA of the diagonally rearward D2 in the outer side LA of the foot. On the other hand, it is presumed that the inner ME of the foot is headed toward the inner ME of the diagonally rearward D2.

In one aspect, the present invention includes a rubber outsole 5 and a resin midsole 4. The plurality of first cleats 11 to 14 and second cleats 22 made of rubber project from the base surface 5 </ b> S of the outsole 5. , 23 and the third cleats 31 to 34 are disposed on the soles of the front foot portion 5F, the middle foot portion 5M and the rear foot portion 5R, respectively.
Among the first cleats 11 to 14, the inner first cleats 11 and 12 disposed on the inner side ME of the foot have engagement surfaces 11E and 12E toward the outer side LA of the oblique rear D2,
Outer first cleats 13 and 14 disposed on the outer side LA of the first cleats 11 to 14 have engaging surfaces 13E and 14E toward the inner ME of the oblique rear D2,
Among the second cleats 22 and 23, the inner second cleat 22 disposed on the inner side ME of the foot has an engagement surface 22E toward the outer side LA of the oblique front D1,
Of the second cleats 22 and 23, the outer second cleat 23 disposed on the outer side LA of the foot has an engagement surface 23E toward the inner ME of the oblique front D1,
Among the third cleats 31 to 34, the inner third cleats 31 and 32 disposed on the inner side ME of the foot have engagement surfaces 31E and 32E toward the outer side LA of the oblique front D1,
Out of the third cleats 31 to 34, the outer third cleats 33 and 34 disposed on the outer side LA of the foot have engagement surfaces 33E and 34E toward the inner ME of the oblique front D1.

In the present invention, the term “engagement surface toward ˜” means “the engagement surface that is substantially orthogonal to ˜”. However, the engagement surface does not need to be perpendicular to the base surface 5S, and may be 70 ° to 110 ° with respect to the base surface 5S.

In the present invention, the engagement surfaces 11E and 12E of the inner first cleats 11 and 12 of the forefoot portion 5F are directed toward the outer side LA obliquely rearward, while the outer first cleats 13 and 14 of the forefoot portion 5F are engaged. The surfaces 13E and 14E are directed toward the inner ME on the oblique rear side. Therefore, the engagement surfaces 11E to 14E are easily engaged so as to be orthogonal to the load direction described above. Therefore, the grip when climbing and walking will be high and it will be difficult to slip.
Such grip performance will also be exhibited when walking on flat ground.

On the other hand, in the middle foot portion 5M and the rear foot portion 5R, the engagement surfaces 22E, 31E, 32E of the inner second and third cleats 22, 31, 32 are directed toward the outer front LA obliquely forward. Further, in the middle foot portion 5M and the rear foot portion 5R, the engagement surfaces 23E, 33E, 34E of the outer second and third cleats 23, 33, 34 are directed toward the obliquely forward inner ME. Therefore, the engagement surfaces 22E, 23E, 31E to 34E are easily engaged so as to be orthogonal to the load direction described above. Therefore, it will have a high grip when walking down and will not slip easily.
Such grip performance will also be exhibited when walking on flat ground.

FIG. 1 is a schematic bottom view showing a shoe sole according to Embodiment 1 of the present invention. FIG. 2 is a schematic bottom view showing an enlarged front foot portion of the shoe sole. FIG. 3 is a schematic bottom view showing an enlarged middle foot portion and rear foot portion of the shoe sole. 4A is a cross-sectional view taken along line IV-IV of FIG. 1, and FIG. 4B is a partially enlarged cross-sectional view of FIG. 5A, FIG. 5B, FIG. 5C, FIG. 5D, FIG. 5E and FIG. 5F are respectively AA, BB, CC, DD, EE, and FF of FIG. It is sectional drawing of the outsole in a line. FIG. 6 is a perspective view of the outsole when the front foot portion is viewed from the inside. FIG. 7 is a perspective view of the outsole when the front foot portion is viewed from the outside. FIG. 8 is a perspective view of the outsole when the rear foot portion is viewed from the inside. FIG. 9 is a perspective view of the outsole when the rear foot portion is viewed from the outside. FIG. 10A is a bottom view of a shoe sole showing only a cleat having a height of 2.8 mm or more among cleats, and FIG. 10B is a plan view showing a skeleton of a foot. FIG. 11A is a plan view showing the force generated in the sole surface during ascending walking and descending walking as a vector, and FIGS. 11B, 11C, and 11D are schematic bottom views of shoe soles showing other examples of arrangement of cleats, respectively. .

  Preferably, an angle α2 formed by at least one of the engagement surfaces 22E and 23E of the second cleats 22 and 23 and the base surface 5S is formed by the rear surface BS of the second cleats 22 and 23 and the base surface 5S. It is the same as the angle β2 or an angle closer to a right angle than the angle β2.

When the angle α2 is closer to the right angle than the angle β2, the engagement surfaces 22E and 23E easily engage with soil in the middle foot portion 5M, and the grip performance is improved, while the rear surface BS is inclined with respect to the base surface 5S. The area of the area where the second cleats 22 and 23 protrude from the base surface 5S is larger than the area of the top surface T of the second cleats 22 and 23, and the load applied to the soles is increased. You can expect to be dispersed and relaxed.
In order to obtain a sufficient engagement action, the engagement surface is more preferably set to 80 ° to 100 ° with respect to the base surface 5S.

  Preferably, an angle α3 formed by at least one of the engagement surfaces 31E to 34E of the third cleats 31 to 34 and the base surface 5S is formed by the rear surface BS of the third cleats 31 to 34 and the base surface 5S. The angle is the same as the angle β3 or closer to a right angle than the angle β3.

  Preferably, an angle α1 formed by at least one of the engagement surfaces 11E to 14E of the first cleats 11 to 14 and the base surface 5S is formed by the front surface FS of the first cleats 11 to 14 and the base surface 5S. It is the same as the angle β1 or an angle closer to a right angle than the angle β1.

  When the angle α3 is closer to the right angle than the angle β3, or when the angle α1 is closer to the right angle than the angle β1, the grip performance and the push-up relaxation can be expected in the rear foot portion 5R and the front foot portion 5F.

  Preferably, the first, second and third cleats 11 to 14, 22, 23, 31 to 34 protrude from the base surface 5S by approximately 2 to 10 mm. For cleats other than the first to third cleats, cleats having a height of less than 2 mm may exist.

  In this case, when the protrusion height H from the base surface 5S is 2 mm (millimeters) or more, a certain degree of engagement force can be obtained. Moreover, stability and a lightness are not inhibited by protrusion height H being 10 mm or less.

For these reasons, the protrusion height H is more preferably about 2.5 to 8 mm, more preferably about 2.8 to 7 mm, and most preferably about 3 to 6 mm.

  Preferably, the area of each top surface T to be grounded in each of the first, second and third cleats 11 to 14, 22, 23, 31 to 34 is 50 to 500 square millimeters, more preferably 50 to 300. Square millimeter.

  If the area of the top surface T is less than 50 square millimeters, it is difficult to form a sufficiently long engagement surface. On the other hand, if the area of the top surface T exceeds 300 square millimeters, it will be difficult for cleats to enter the ground.

Preferably, angles θ22 and θ23 formed by a normal line NL perpendicular to at least one of the engagement surfaces 22E and 23E of the second cleats 22 and 23 and the long axis CL of the foot are set to 15 ° to 45 °. And the area of the said engaging surfaces 22E and 23E is set to 20-500 square millimeters, More preferably, the said area is set to 40-200 square millimeters.
Here, “the angle formed between the normal line perpendicular to the engagement surface and the long axis of the foot” takes into account the case where the engagement surface is inclined with respect to the base surface 5S, and the normal line and the long axis are It means the angle formed by both lines when projected onto the basal plane 5S.

In this case, the engagement surfaces 22E and 23E will exert an engagement force toward the intended engagement direction in the middle foot portion 5M.
If the angles θ22 and θ23 are smaller than 15 ° or larger than 45 °, a deviation occurs in the engaging direction, and a sufficient engaging force cannot be exhibited.
Further, if the engagement area is less than 40 square millimeters, it is difficult to sufficiently engage the ground. On the other hand, if it exceeds 200 square millimeters, the engagement force of one cleat is locally increased and the balance of walking is increased. It may be easy to collapse.

For this reason, more preferably, the engagement surfaces 22E and 23E in which the angles θ22 and θ23 are set to 15 ° to 45 ° are at least one for both the inner and outer second cleats 22 and 23 (each). Or a plurality are formed. More preferably, the angles θ22 and θ23 formed by the normal line NL perpendicular to both the engaging surfaces 22E and 23E and the long axis CL of the foot are set to 20 ° to 40 °, and most preferably the engaging surfaces 22E, The area of 23E is set to 50 to 160 square millimeters.

Preferably, angles θ31 to θ34 formed by a normal line NL perpendicular to at least one of the engagement surfaces 31E to 34E of the third cleats 31 to 34 and the long axis CL of the foot are set to 15 ° to 45 °. And the area of the said engagement surfaces 31E-34E is set to 20-500 square millimeters, More preferably, it is set to 40-200 square millimeters.

In this case, like the above-described middle foot portion 5M, the engagement surfaces 31E to 34E in the rear foot portion 5R will exert an engagement force toward the intended engagement direction.

For the same reason as described above, more preferably, the engagement surfaces 31E to 34E in which the angles θ31 to θ34 are set to 15 ° to 45 ° are at least for both the inner and outer third cleats 31 to 34 (each). One or more are formed. More preferably, the angles θ31 to θ34 formed by the normal NL perpendicular to the engagement surfaces 31E to 34E and the long axis CL of the foot are set to 20 ° to 40 °, and most preferably the engagement surfaces 31E to 34E. Is set to 50 to 160 square millimeters.

Preferably, angles θ11 to θ14 formed by a normal line NL perpendicular to the engagement surfaces 11E to 14E of at least one of the first cleats 11 to 14 and the long axis CL of the foot are set to 20 ° to 60 °. And the area of the said engaging surfaces 11E-14E is set to 20-500 square millimeters, More preferably, it is set to 40-200 square millimeters.

In this case, like the above-described middle foot portion 5M, the engagement surfaces 11E to 14E in the front foot portion 5F will exert an engagement force toward the intended engagement direction.

For the same reason as described above, the engagement surfaces 11E to 14E in which the angles θ11 to θ14 are set to 20 ° to 60 ° are more preferably at least 1 for both the inner and outer first cleats 11 to 14 (each). One or more are formed. More preferably, the angles θ11 to θ14 formed by the normal line NL perpendicular to the engaging surfaces 11E to 14E and the long axis CL of the foot are set to 25 ° to 55 °, and most preferably the engaging surfaces 11E to 14E. Is set to 60 to 200 square millimeters.

Preferably, the midsole 4 includes a midsole main body 40 and a reinforcing device 41 having a Young's modulus larger than that of the midsole main body 40, and at least one of the second cleats 22 and 23 is directly below the reinforcing device 41. Some are arranged.

When the second cleats 22 and 23 of the middle foot portion 5M come into contact with the ground, the reaction force is applied to the middle foot 1M between the Lisfranc joint and the Chopard joint, and it is easy to feel pushing up on the sole. On the other hand, in this example, the second cleats 22 and 23 are arranged in a part directly below the strengthening device 41, and it is difficult to feel the push-up.

In particular, when the reinforcing device 41 is formed of a foam resin, an appropriate cushion is given to the foot arch and the foot arch is prevented from falling.

More preferably, a plurality of the inner second cleats 22 are arranged spaced apart from each other in the front-rear direction of the foot, and the inner second cleat 22 in front of the top surface T of the inner second cleat 22 in the rear D2 in an unloaded state. The distance from the road surface is larger on the top surface T of
A plurality of the outer second cleats 23 are arranged spaced apart from each other in the front-rear direction of the foot, and in a no-load state, the top surface T of the outer second cleat 23 ahead of the top surface T of the outer second cleat 23 in the rear D2. The distance from the road is larger.

In the middle foot portion 5M, the top surface T of the front second cleats 22, 23 has a greater distance from the road surface 100 than the top surface T of the rear second cleats 22, 23. Therefore, when the foot flat after landing, the front D1 of the upper surface of the midsole 4 on the outsole 5 is likely to sink in the middle foot portion 5M. Therefore, the stagnation of the load that is likely to occur in the middle foot portion 5M during the foot flat is less likely to occur, and it is easy to walk forward.

More preferably, the top surfaces T of the second cleats 22 and 23 in the front D1 are not grounded in the unloaded state, and a value obtained by dividing one foot load (load on one shoe) by the foot size is 8 kg. / Cm, more preferably 4 kg / cm, even more preferably 3 kg / cm.
The load on one leg on the middle foot during high-speed walking is about 60% of the body weight (about 80% of the body weight during low-speed walking), and when the body weight is 60 kg and the foot size is 27 cm, 60 kg × 0.6 ÷ 27 cm = 1. A load of 33 kg / cm is applied. Therefore, it is particularly preferable to ground when the value is at least 2 kg / cm, and most preferably ground when it is at least 1.3 kg / cm. It should be noted that the load on one leg applied to the middle foot during high-speed running is about 300% of the body weight. When the body weight is 70 kg and the foot size is 27 cm, a load of 70 kg × 3.0 ÷ 27 cm = 7.78 kg / cm is applied. Further, the load on one leg applied to the middle foot during low-speed running is about 150% of the body weight. When the body weight is 70 kg and the foot size is 27 cm, a load of 70 kg × 1.5 ÷ 27 cm = 3.89 kg / cm is applied. Further, the load on one leg applied to the middle foot during low-speed walking is about 80% of the body weight. When the body weight is 70 kg and the foot size is 27 cm, a load of 70 kg × 0.8 ÷ 27 cm = 2.07 kg / cm is applied.

In this case, the second cleats 22 and 23 in the front D1 are grounded during walking, and can suppress the fall of the arch of the foot, and enter the ground after the grounding and exert an engaging force.

From the viewpoint of suppressing the fall of the arch, the distance from the top surface T of the second cleat 22, 23 of the front D1 to the road surface 100 is preferably about 0.5 mm to 2.0 mm. For the same reason, when the value obtained by dividing the load on one foot by the size of the foot is 0.5 kg / cm or less, it is more preferable that the second cleats 22 and 23 on the front D1 do not come in contact with each other, When the divided value is 1 kg / cm or less, it is particularly preferable that the second cleats 22 and 23 of the front D1 are not grounded.

Preferably, the inner third cleats 31, 32 are
A plurality of cleats 32 near the center disposed at positions closer to the long axis CL of the foot than the inner edge of the outsole 5 and spaced apart from each other in the front-rear direction of the foot; and A plurality of cleats 31 closer to the inner edge disposed closer to the inner edge than the long axis CL;
The outer third cleats 33, 34 are
A plurality of cleats 33 located near the long axis CL of the foot than the outer edge of the outsole 5 and spaced apart from each other in the front-rear direction of the foot; And a plurality of cleats 34 closer to the outer edge than the major axis CL.

In this case, at least four cleats 31 and 32 are disposed in the inner ME of the rear foot portion 5R in a state where they are separated from each other in the front-rear and left-right directions, and are similarly disposed on the outer side LA of the rear foot portion 5R. Therefore, it becomes easy to exert engagement force and support force in the entire rear foot portion 5R, and the support of the rear foot portion 5R will be easily stabilized.

More preferably, of the inner third cleats 31 and 32, the cleat 32 closer to the center and the cleat 31 closer to the inner edge are normal lines perpendicular to the engagement surfaces 31E and 32E of the cleats 31 and 32, respectively. Are offset from each other in the NL direction and are alternately arranged,
Of the outer third cleats 33 and 34, the cleat 33 closer to the center and the cleat 34 closer to the outer edge are offset from each other in the direction of the normal line NL perpendicular to the engagement surfaces 33E and 34E of the respective cleats 33 and 34. And are alternately arranged.

In this case, at each of the inside and outside of the rear foot portion 5R, at least four cleats are offset from each other in the direction of the normal line NL and are alternately arranged. Therefore, any one of the cleats is easily arranged on an arbitrary line crossing the rear foot portion 5R, and the engagement force and the support force are more easily exerted on the entire rear foot portion 5R, so that the rear foot portion 5R is supported. It will be easier to stabilize.

More preferably, the center-side cleat 32 of the inner third cleats 31 and 32 and the center-side cleat 33 of the outer third cleats 33 and 34 are offset from each other in the major axis CL direction. Are arranged.

In this case, at least eight cleats 31 to 34 of the rear foot portion 5R are further offset. For this reason, the entire rear foot portion 5R is more likely to exert the engagement force and the support force, and the support of the rear foot portion 5R will be more stable.

Preferably, the inner first cleats 11, 12 are
A plurality of cleats 12 located near the center of the foot and closer to the long axis CL of the foot than the inner edge of the outsole 5; A plurality of cleats 11 arranged closer to the inner edge than the major axis CL, and disposed closer to the inner edge,
The outer first cleats 13 and 14 are:
A plurality of cleats 13 near the center disposed at positions closer to the long axis CL of the foot than the outer edge of the outsole 5, and spaced apart from each other in the front-rear direction of the foot; and And a plurality of cleats 14 closer to the outer edge than the major axis CL.

In this case, at least four cleats 11 and 12 are arranged in the front-rear and left-right separated state in the inner ME of the forefoot part 5F, while being similarly arranged in the outer side LA of the forefoot part 5F. Therefore, the entire forefoot portion 5F is likely to exert engagement force and support force, and the support of the forefoot portion 5F will be likely to be stabilized.

More preferably, of the inner first cleats 11 and 12, the cleat 12 closer to the center and the cleat 11 closer to the inner edge are normal lines perpendicular to the engaging surfaces 11E and 12E of the cleats 11 and 12, respectively. Are offset from each other in the NL direction and are alternately arranged,
Of the outer first cleats 13 and 14, the cleat 13 closer to the center and the cleat 14 closer to the outer edge are offset from each other in the direction of the normal line NL perpendicular to the engaging surfaces 13E and 14E of these cleats 13 and 14. And are alternately arranged.

In this case, at each of the inside and outside of the forefoot portion 5F, at least four cleats are offset from each other in the direction of the normal line NL and are alternately arranged. Therefore, any one of the cleats is easily arranged on an arbitrary line crossing the forefoot portion 5F, and the engagement force and the support force are more easily exhibited in the entire forefoot portion 5F, so that the support of the forefoot portion 5F is further stabilized. It will be easy.

More preferably, the central cleat 12 of the inner first cleats 11 and 12 and the central cleat 13 of the outer first cleats 13 and 14 are offset from each other in the major axis CL direction. Are arranged.

In this case, at least eight cleats 11 to 14 of the front foot portion 5F are further offset. Therefore, the entire forefoot portion 5F is more likely to exert the engagement force and the support force, and the support of the forefoot portion 5F will be more stable.

Preferably, the cleats 12 and 13 closer to the center of the first cleats 11 to 14 are disposed on the outer side LA of the foot than the engagement surface 12E of the inner first cleat 12 disposed on the inner side ME of the foot. The engaging surface 13E of the outer first cleat 13 has a larger area.

During walking, the load distribution in the sole surface changes the direction of the load around the baseball. For this reason, the boundary line in which the direction of the engagement surface of the cleat changes in the foot width direction is slightly offset from the long axis of the foot to a line slightly closer to the inner ball. Therefore, the area of the outer area is larger than the inner area than this line. Therefore, by making the area of the engaging surface 13E of the outer first cleat 13 larger than that of the inner first cleat 12, the engaging force is easily exerted.

Preferably, the inner first cleats 11 and 12 are disposed in a region surrounded by two cleats 11 and 11 near the inner edge and two cleats 12 and 12 near the center, and the inner first cleats 11 and 12 An inner auxiliary cleat 15 having an engagement surface 15E on a surface intersecting the engagement surfaces 11E, 12E;
The outer first cleats 13, 14 are arranged in a region surrounded by the two outer cleats 14, 14 and the two central cleats 13, 13, and are engaged with the outer first cleats 13, 14. An outer auxiliary cleat 16 having an engagement surface 16E on a surface intersecting with 13E and 14E,
Each of the auxiliary cleats 15 and 16 is disposed apart from the first cleats 11 to 14.

A footpad is arranged on the front foot 1F, and various complicated operations are required as compared with the rear foot 1R. For example, in the case where the direction is changed by propelling diagonally forward inward or outward, or when stopping suddenly, engaging forces in various directions may be required in the front foot 1F.

From this point of view, the auxiliary cleats 15 and 16 having the engaging surfaces 15E and 16E on the surfaces intersecting the engaging surfaces 11E to 14E of the first cleats 11 to 14 exert an engaging force when the direction is changed. Will demonstrate.
In particular, since the main first cleats 11 to 14 and the auxiliary cleats 15 and 16 are spaced apart from each other, it may be difficult to cause a situation in which the clay soil adheres between the cleats in the front foot portion 5F. Absent.

Preferably, a virtual line VL that extends smoothly back and forth along the long axis CL of the foot is set, and each of the inner cleats 11, 12, 22, 31, and 32 is disposed on the inner side ME of the virtual line VL. The outer cleats 13, 14, 23, 33, and 34 are disposed on the outer side LA of the virtual line VL.

In this case, the midsole 4 is supported by a thin plate-like portion of the outsole 5 on the virtual line VL between the inner cleats and the outer cleats, and is not supported by the cleats. Therefore, the upper surface of the midsole 4 is likely to sink downward along the virtual line VL, the foot is guided along the long axis CL, and the foot is not easily warped or warped. Therefore, walking and running efficiency will be improved.

More preferably, of the first and third cleats 11 to 14 and 31 to 34, the cleats 12, 13, 32, and 33 arranged close to the virtual line VL are adjacent to the virtual line VL. A first groove G1 is formed along the closest first side S1.

By forming the first groove G1, the upper surface of the midsole 4 tends to sink downward in the vicinity of the first side S1. Therefore, the upper surface of the midsole 4 will easily sink further downward along the virtual line VL.

More preferably, the first groove G1 extends along a pair of second sides S2, S2 adjacent to the first side S1 of the cleats 12, 13, 32, 33 arranged close to the virtual line VL. The 2nd groove | channel G2 continuing to is formed.

In this case, the midsole 4 is more likely to sink downward in the vicinity of the first side S1.
Even if the second groove G2 is not provided over the entire length of the second side S2, the second groove G2 may be provided so as to be continuous with the first groove G1.

More preferably, a long groove G extending from the front foot portion 5F to the rear foot portion 5R along the virtual line VL is formed on the base surface 5S.

In this case, the long groove G is recessed with respect to the base surface 5S, and in the long groove G, the outsole 5 is thinner than the base portion (part defined by the base surface 5S). Therefore, the upper surface of the midsole 4 tends to sink further downward in the long groove G.

Preferably, the cleats 12 and 13 near the center of the first cleats 11 to 14, the second cleats 22 and 23, and the cleats 32 and 33 near the center of the third cleats 31 to 34 are: It is formed in a square plate shape.

Unlike a V-shaped or U-shaped cleat, a square-shaped cleat has a linear engagement surface. For this reason, clayey soil is less likely to adhere to the cleat than in a V-shape or the like.

Preferably, the sum total of the areas of the top surfaces T of the second cleats 22 and 23 having a height of 2 mm to 10 mm is 20% to 60% of the projected area obtained by projecting the midfoot part 5M of the shoe sole onto a plane. is there.

In the middle foot portion 5M, if the total area of the top surfaces T is less than 20%, the ground contact area in the middle foot portion 5M is small, so that the wearer can easily feel push-up, and the number of second cleats The size is likely to be insufficient, and sufficient engagement force will not be obtained.

In the middle foot portion 5M, if the sum of the areas of the top surface T exceeds 60%, the ground contact area in the middle foot portion 5M is large, so that the second cleat is less likely to enter the soil, and the second cleat is involved. The amount of soil to be combined is small, and it will be difficult to obtain sufficient engagement force.

From this viewpoint, more preferably, in the middle foot portion 5M, the total is set to 30% to 50% of the projected area.

For the same reason, preferably, the area of the top surface T of the cleats 11 to 16 having the height of 2 mm to 10 mm in the region 5FR in the posterior D2 with respect to the first metatarsal joint MP1 in the forefoot portion 5F. The total sum is 25% to 65% of the projected area of the rear D2 region 5FR of the shoe sole projected on a plane.

The area ratio of the forefoot portion 5F is more preferably 35% to 55%.

Preferably, the fourth cleats 42 and 43 are provided in a region 5F2 of the posterior D2 with respect to the line MP connecting the joints between the metatarsal joints in the forefoot portion 5F.
Among the fourth cleats 42 and 43, the inner fourth cleat 42 disposed on the inner side ME of the foot has an engagement surface 42E toward the outer side LA of the oblique front D1,
Out of the fourth cleats 42 and 43, the outer fourth cleat 43 disposed on the outer side LA of the foot has an engagement surface 43E toward the inner ME of the diagonally forward D1.

In the area 5F2 behind the front foot portion 5F in the outsole 5, a load directed diagonally backward acts as shown by a one-dot chain line in FIG. 11A when walking down. Therefore, the fourth cleats 42 and 43 having the engaging surfaces 42E and 43E heading obliquely forward D1 are provided in the rear region 5F2, so that the grip performance when walking down will be further improved.

Preferably, the front angle D11 of the inner first cleat 11 is larger in the front D1 than the main ball O1 in the forefoot portion 5F as the cleat of the rear D2.

In this case, the closer the inner first cleat 11 is to the main ball O1, the larger the angle θ11. Therefore, the engagement force with respect to the load indicated by the solid line in FIG. 11A is exhibited.

Preferably, a plurality of first and fourth cleats 10, 11, 42, having engagement surfaces 10E, 11E, 42E, 43E toward the main ball O1 are provided around the main ball O1 in the forefoot portion 5F. 43 is further provided.
In this case, each cleat efficiently engages the soil against the radial load generated around the main ball O1 during climbing and descending walking.

Preferably, the middle foot portion 5M includes
An inner edge-side second cleat 21 having an engagement surface 21 </ b> E toward the outer side of the oblique front D <b> 1 and disposed closer to the inner edge than the inner second cleat 22;
It further includes an outer edge-side second cleat 24 that has an engagement surface 24 </ b> E that faces inward of the oblique front D <b> 1 and is arranged closer to the outer edge than the outer second cleat 23.
In this case, the second cleats 21 and 24 near the inner and outer edges increase the engagement force.
More preferably, the second cleat 21 near the inner edge is disposed further rearward than the innermost second cleat 22 at the rearmost among the second inner cleats 22.
The outer edge-side second cleat 24 is disposed further rearward than the rearmost outer second cleat 23 of the outer second cleat 23.
In this case, the second cleats 21 and 24 closer to the inner and outer edges than the inner second cleat 22 and the outer second cleat 23 are arranged on the rear side, so that the engagement is from the rear foot portion 5R to the middle foot portion 5M. The resultant force and the support force will be more easily exhibited, and the support from the rear foot portion 5R to the middle foot portion 5M will be more stable.
More preferably, between the rearmost inner second cleat 22 of the inner second cleat 22 and the innermost third cleat 32 of the inner third cleat 32, these cleats 22, 32. On the other hand, the second cleat 21 closer to the inner edge is arranged offset in the direction of the normal line NL perpendicular to the engagement surface 21E,
Between the outermost second cleat 23 of the outermost second cleat 23 and the outermost third cleat 33 of the outermost third cleat 33, the cleats 23, 33 are engaged with the engagement. The second cleat 24 closer to the outer edge is disposed offset in the direction of the normal line NL perpendicular to the mating surface 24E.
In this case, at least four cleats 21 to 24 are offset from each other in the middle foot portion 5M. Therefore, the engagement force and the support force are more easily exhibited from the rear foot portion 5R to the middle foot portion 5M, and the support of the middle foot portion 5M from the rear foot portion 5R is likely to be further stabilized.

  The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and figures are for illustration and description only and should not be used to define the scope of the present invention. The scope of the present invention is defined only by the claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.

Embodiments of the present invention will be described below with reference to the drawings.
This embodiment is, for example, a shoe sole for trail running / walking.
As shown in FIG. 4, the shoe sole includes a rubber outsole 5 and a resin midsole 4. An upper (not shown) for covering the instep is provided on the shoe sole.

The midsole 4 includes, for example, a midsole body 40 made of EVA foam and a reinforcing device 41 made of EVA foam or non-foam. In addition, "made of resin" means that it has a resin component such as thermoplasticity, and includes any appropriate other component. The midsole 4 may be provided with a low repulsion material, a high repulsion material, a groove, and the like.

The outsole 5 is a grounded bottom that is more wear resistant than the midsole body 40, and generally has a higher hardness than the foam of the midsole body 40. The term “made of rubber” means that it has components of natural rubber and synthetic rubber, and includes any other component.

As shown in FIG. 1, the outsole 5 includes a plurality of rubber first cleats 11 to 14, second cleats 21 to 24, and third cleats 31 to 34, respectively. 5M and the rear foot 5R.

The forefoot portion 5F, the middle foot portion 5M, and the rear foot portion 5R mean portions covering the front foot 1F, the middle foot 1M, and the rear foot 1R of the foot in FIG. 10B, respectively. The forefoot 1F includes five metatarsals and 14 ribs. The metatarsal 1M includes a scaphoid bone, a cubic bone, and three wedge bones.

  As shown in FIGS. 4 to 9, the cleats protrude downward from the base surface 5 </ b> S of the outsole 5 of FIG. 4 and are formed integrally with the outsole 5. The base surface 5S means a bottom surface of a portion having a substantially constant thickness along the lower surface of the midsole 4, and generally has shallow grooves and small irregularities.

In the front foot portion 5F shown in an enlarged manner in FIG. 2, among the first cleats 11 to 14, the inner first cleats 11 and 12 disposed on the inner side ME of the foot are engaging surfaces toward the outer side LA of the oblique rear D2. 11E, 12E. On the other hand, out of the first cleats 11 to 14, the outer first cleats 13 and 14 disposed on the outer side LA of the legs have engagement surfaces 13E and 14E that face the inner ME of the oblique rear D2.
Note that a rubber inner auxiliary cleat 15 and an outer auxiliary cleat 16 described later are formed integrally with the outsole 5 on the front foot portion 5F.

In the middle foot portion 5M shown in an enlarged manner in FIG. 3, the inner second cleat 22 disposed on the inner side ME of the foot among the second cleats 22 and 23 is the engagement surface 22E toward the outer side LA of the oblique front D1. Have On the other hand, of the second cleats 22 and 23, the outer second cleat 23 disposed on the outer side LA of the foot has an engagement surface 23E that faces the inner ME of the diagonally forward D1.
At the rear end of the middle foot portion 5M in FIG. 3, a second cleat 21 near the inner edge and a second cleat 24 near the outer edge are provided inside and outside the second cleats 22 and 23. The second cleat 21 closer to the inner edge has an engagement surface 21E toward the front D1 of the outer side LA. On the other hand, the second cleat 24 closer to the outer edge has an engagement surface 24E toward the front D1 of the inner ME.
The second cleats 21 near the inner edge are offset in the normal NL direction with respect to the cleats behind the rear D2 and the inner third cleats 32 of the inner second cleats 22, and are alternately arranged.
The second cleats 24 near the outer edge are offset in the normal NL direction with respect to the rear D2 cleats and the outer third cleats 33 of the outer second cleats 23 and are alternately arranged.
That is, the second cleat 21 closer to the inner edge is disposed further rearward than the innermost second cleat 22 that is the rearmost of the inner second cleats 22. On the other hand, the second cleat 24 closer to the outer edge is disposed further rearward than the rearmost outer second cleat 23 of the outer second cleat 23.
Between the innermost second cleat 22 that is the rearmost of the inner second cleats 22 and the innermost third cleat 32 that is the frontmost of the inner third cleats 32, The second cleat 21 near the inner edge is disposed offset in the direction of the normal line NL perpendicular to the engagement surface 21E.
Between the outermost second cleat 23 of the outermost second cleat 23 and the outermost third cleat 33 of the outermost third cleat 33, the cleats 23, 33 are engaged with the engagement. The second cleat 24 closer to the outer edge is disposed offset in the direction of the normal line NL perpendicular to the mating surface 24E.
The inner second cleat 22 and the outer second cleat 23 are arranged offset from each other in the long axis direction CL of the foot.
Each of the second cleats 21 to 24 may be disposed at least in part, more preferably in the middle foot part 5M. In addition, each of the third cleats 31 to 34 may be disposed at least in part, and more preferably in the rear foot part 5R.
The majority means more than half.
Further, the second cleats 21 and 24 near the inner and outer edges may be grounded in an unloaded state, and, like the inner and outer second cleats 22 and 23, are not grounded in an unloaded state. Further, it may be grounded under the load.

In the rear foot portion 5R of FIG. 3, among the third cleats 31 to 34, the inner third cleats 31 and 32 disposed on the inner side ME of the foot are engaging surfaces 31E and 32E toward the outer side LA of the oblique front D1. Have On the other hand, out of the third cleats 31 to 34, the outer third cleats 33 and 34 disposed on the outer side LA of the foot have engagement surfaces 33E and 34E that face the inner ME of the oblique front D1.

In FIG. 3, the inner third cleats 31, 32 include a plurality of cleats 31 near the inner edge and cleats 32 near the center. The plurality of cleats 32 near the center are spaced apart from each other in the front-rear direction of the foot, and are disposed at positions closer to the long axis CL of the foot than the inner edge of the outsole 5. The plurality of cleats 31 closer to the inner edge are spaced apart from each other in the front-rear direction of the foot, and are disposed at positions closer to the inner edge than the long axis CL.

The outer third cleats 33 and 34 include a plurality of cleats 33 near the center and cleats 34 near the outer edge. The plurality of cleats 33 near the center are spaced apart from each other in the front-rear direction of the foot, and are disposed at positions closer to the long axis CL of the foot than the outer edge of the outsole 5. The plurality of cleats 34 near the outer edge are separated from each other in the front-rear direction of the foot, and are disposed at positions closer to the outer edge than the long axis CL.

Among the inner third cleats 31 and 32, the cleat 32 near the center and the cleat 31 near the inner edge are normal lines NL perpendicular to the engaging surfaces 31E and 32E of the cleats 31 and 32, respectively. Are mutually offset in the direction of, and are alternately arranged.
Further, of the outer third cleats 33 and 34, the cleat 33 near the center and the cleat 34 near the outer edge are normal lines NL perpendicular to the engaging surfaces 33E and 34E of the cleats 33 and 34, respectively. Are mutually offset in the direction of, and are alternately arranged.

In the present invention, “offset mutually and alternately in the normal NL direction” is not simply offset, but in the normal NL direction, for example, a cleat 33 (32 near the center). ) And the cleat 33 (32) near the center, the cleat 34 (31) near the outer edge is disposed, and the cleat 34 (31) near the outer edge and the cleat 34 (31) near the outer edge in the normal NL direction. This means that the cleat 33 (32) closer to the center is arranged at a position between the two.

The center-side cleat 32 of the inner third cleats 31 and 32 and the center-side cleat 33 of the outer third cleats 33 and 34 are arranged slightly offset from each other in the major axis CL direction. ing.

In FIG. 2, the inner first cleats 11 and 12 include a plurality of cleats 11 near the inner edge and cleats 12 near the center. The plurality of cleats 12 near the center are spaced apart from each other in the front-rear direction of the foot, and are disposed at positions closer to the long axis CL of the foot than the inner edge of the outsole 5. The plurality of cleats 11 near the inner edge are spaced apart from each other in the front-rear direction of the foot, and are disposed at positions closer to the inner edge than the long axis CL.

  The outer first cleats 13 and 14 include a plurality of cleats 13 near the center and cleats 14 near the outer edge. The plurality of cleats 13 near the center are spaced apart from each other in the front-rear direction of the foot, and are disposed at positions closer to the long axis CL of the foot than the outer edge of the outsole 5. The plurality of cleats 14 near the outer edge are separated from each other in the front-rear direction of the foot and are disposed at positions closer to the outer edge than the long axis CL.

Of the inner first cleats 11 and 12, the cleat 12 closer to the center and the cleat 11 closer to the inner edge are in the direction of the normal line NL perpendicular to the engaging surfaces 11E and 12E of the cleats 11 and 12. They are offset from each other and arranged alternately.
Of the first outer cleats 13 and 14, the cleat 13 closer to the center and the cleat 14 closer to the outer edge are in the direction of the normal line NL perpendicular to the engaging surfaces 13E and 14E of the respective cleats 13 and 14. Are mutually offset and alternately arranged.
Note that the meanings of “offset from each other in the normal NL direction and alternately arranged” are the same as described above.

Of the inner first cleats 11 and 12, the cleat 12 closer to the center and of the outer first cleats 13 and 14, the cleat 13 closer to the center are offset from each other in the major axis CL direction. Yes. It should be noted that at least a part of the first cleats 11 to 14, more preferably the majority, may be disposed on the forefoot part 5F.

The forefoot portion 5F further includes the inner auxiliary cleat 15 and the outer auxiliary cleat 16. Each of the auxiliary cleats 15 and 16 is disposed apart from the first cleats 11 to 14.

The inner auxiliary cleat 15 is a region surrounded by two adjacent inner edge cleats 11, 11 of the inner first cleats 11, 12 and two adjacent central cleats 12, 12. And has an engagement surface 15E on a surface intersecting with the engagement surfaces 11E, 12E of the inner first cleats 11, 12.
The outer auxiliary cleat 16 is located in a region surrounded by two adjacent outer edge cleats 14 and 14 of the outer first cleats 13 and 14 and two adjacent central cleats 13 and 13. The engaging surface 16E is provided on a surface that is disposed and intersects with the engaging surfaces 13E and 14E of the outer first cleats 13 and 14.

As shown in FIGS. 5A and 5B, an angle α1 formed by the engagement surfaces 11E to 14E of the first cleats 11 to 14 and the base surface 5S is the front surface FS of the first cleats 11 to 14 and the base surface. It is the same as the angle β1 formed by 5S, or an angle closer to a right angle than this angle β1.

More specifically, the engagement surfaces 12E and 13E of the cleats 12 and 13 closer to the center are closer to the right angle α1 than the front surface FS, but are not right angles. On the other hand, the engagement surfaces 11E and 14E of the cleats 11 and 14 near the inner edge and the outer edge have a right angle α1.
In addition, angle (alpha) 1 of each engagement surface 11E-14E and angle (beta) 1 of each front surface FS may be the same.

As shown in FIG. 5C, the engaging surfaces 15E, 16E of the auxiliary cleats 15, 16 are formed as inclined surfaces.

An angle α2 formed by the engagement surfaces 22E and 23E of the four second cleats 22 and 23 in FIG. 3 and the base surface 5S in FIG. 5D is determined by the rear surface BS and the base surface 5S of the second cleats 22 and 23. Is an angle closer to a right angle than the angle β2 formed by. In this embodiment, the angle α2 is a right angle, and the angle β2 is inclined with respect to the basal plane 5S. Both the angles α2 and β2 may be a right angle, or both may be inclined with respect to the basal plane 5S.

As shown in FIGS. 5E and 5F, an angle α3 formed by the engagement surfaces 31E to 34E of the third cleats 31 to 34 and the base surface 5S is determined by the rear surface BS of the third cleats 31 to 34 and the base surface. It is the same as the angle β3 formed by 5S, or an angle closer to a right angle than this angle β3.

More specifically, the angle α3 of the engagement surfaces 32E and 33E of the cleats 32 and 33 closer to the center is the same angle as the angle β3 of the rear surface BS and is not a right angle. On the other hand, the engagement surfaces 31E and 34E of the cleats 31 and 34 near the inner edge and the outer edge have a right angle α3. The angle α3 of the engagement surfaces 31E and 34E and the angle β3 of each rear surface BS may be the same.

In FIG. 3, angles θ22 and θ23 formed by the normal line NL perpendicular to the engagement surfaces 22E and 23E of the second cleats 22 and 23 and the long axis CL of the foot are set to 15 ° to 45 °. The area of the engagement surfaces 22E and 23E is set to 40 to 200 square millimeters.

In the figure, the angles θ31 to θ34 formed by the normal NL perpendicular to the engagement surfaces 31E to 34E of the third cleats 31 to 34 and the long axis CL of the foot are set to 15 ° to 45 °. The area of the engagement surfaces 31E to 34E is set to 40 to 200 square millimeters.

In FIG. 2, angles θ11 to θ14 formed by the normal NL perpendicular to the engagement surfaces 11E to 14E of the first cleats 11 to 14 and the long axis CL of the foot are set to 20 ° to 60 °. The area of the engagement surfaces 11E to 14E is set to 40 to 200 square millimeters.

Among the first cleats 11 to 14, the cleats 12 and 13 closer to the center are the outer first cleats 13 arranged on the outer side LA than the engaging surface 12E of the inner first cleat 12 arranged on the inner side ME of the foot. The engagement surface 13E has a larger area.

5A to 5F, the protrusion height H of the first, inner auxiliary, outer auxiliary, second and third cleats 11 to 16, 22, 23, 31 to 34 from the base surface 5S is, for example, 2. It is set to 8 mm to 4.2 mm.

In FIG. 4B, the reinforcing device 41 has a Young's modulus greater than that of the midsole body 40, and preferably has a Young's modulus greater than that of the midsole body 40 and the outsole 5. At least a part of the second cleats 22 and 23 arranged at the foremost D1 of the second cleats 22 and 23 is arranged directly below the reinforcing device 41 indicated by a broken line in FIG.

A plurality of the inner second cleats 22 are arranged apart from each other in the front-rear direction of the foot, and as shown in FIGS. 4A and 4B, in front of the top surface T of the inner second cleat 22 at the rear D2 in an unloaded state. The distance between the top surface T of the inner second cleat 22 and the road surface 100 is greater.
A plurality of the outer second cleats 23 shown in FIG. 3 are arranged apart from each other in the front-rear direction of the foot, and in front of the top surface T of the outer second cleat 23 in the rear D2 in the no-load state of FIGS. 4A and 4B. The top surface T of the outer second cleat 23 has a greater distance from the road surface.

That is, the top surfaces T of the second cleats 22 and 23 in the front D1 do not come into contact with the road surface 100 in the unloaded state, but the value obtained by dividing the load on one foot by the size of the foot is, for example, 1.3 kg / cm or more If it is, ground. The load is generated during walking or running of a wearer having a normal physique.

As shown in FIGS. 2 and 3, the base surface 5S is formed with a long groove G extending from the rear foot portion 5R to the front foot portion 5F in FIG. 2 along the virtual line VL. The long groove G extends smoothly back and forth along the long axis CL of the foot. More specifically, the imaginary line VL is set at substantially the same position as the long axis CL of the foot in the middle foot part 5M and the rear foot part 5R in FIG. 3 (the long groove G overlaps the long axis CL), In the forefoot portion 5F of FIG. 2, the forefoot 5F is inclined forward toward the inner side ME and extends forward.

In FIG. 1, the inner cleats 11, 12, 22, 31, and 32 are disposed on the inner ME with respect to the virtual line VL. The outer cleats 13, 14, 23, 33, and 34 are disposed on the outer side LA with respect to the virtual line VL.

Of the first and third cleats 11 to 14, 31 to 34 shown in FIG. 1, the cleats 12, 13, 32, and 33 arranged close to the long groove G are closest to the virtual line VL. A first groove G1 is formed along the first side S1 of FIGS.

As shown in FIGS. 6 to 9, a second continuous with the first groove G <b> 1 along a pair of second sides S <b> 2 and S <b> 2 adjacent to the first side S <b> 1 of the cleats 12, 13, 32 and 33. A groove G2 is formed.

Further, a third groove G3 that is continuous with the second groove G2 is formed along the third side S3 opposite to the first side S1 of the cleats 12, 13, 32, and 33.

As shown in FIGS. 6 to 9, the cleats 12 and 13 near the center of the first cleats 11 to 14, the second cleats 22 and 23, and the center of the third cleats 31 to 34. The cleats 32 and 33 are formed in a rectangular thick plate shape.

In the case of the present embodiment, the rectangular first cleats 12 and 13 in FIG. 1 are formed in a trapezoidal thick plate shape. The square second and third cleats 22, 23, 32, 33 are formed in a parallelogram thick plate shape.

As can be seen from FIGS. 6 to 9 and FIG. 4A, the outsole 5 winds up along the upper midsole 4 at the inner and outer edges and front and rear ends, that is, at the periphery of the outsole 5. The basal plane 5S of the outsole 5 is rounded, so that it is easy to travel and walk.
In addition, the cleats 51 and 52 at the front and rear ends protrude from the base surface 5S by about 2.8 mm to 4.5 mm.

In FIG. 1, the area of the top surface T to be grounded in each of the first, second and third cleats 11 to 14, 22, 23, 31 to 34 is set to 50 to 300 square millimeters.

In FIG. 10A, halftone dots are attached to the top surface T of the cleats 11 to 16, 21 to 24, and 31 to 34 having a protrusion height H of 2.8 mm to 4.2 mm.

  In the middle foot portion 5M of FIG. 10A, the sum of the areas of the top surfaces T of the second cleats 22 and 23 having the height of 2.8 mm to 4.2 mm is the projection of the middle foot portion 5M of the shoe sole on the plane. 30% to 50% of the projected area.

  On the other hand, the sum total of the areas of the top surfaces T of the cleats 11 to 16 having the height of 2.8 mm to 4.2 mm in the region 5FR posterior D2 from the first metatarsal joint MP1 in the forefoot portion 5F. Is preferably 35% to 55% of the projected area of the rear D2 region 5FR of the shoe sole on a plane, and is larger than that of the midfoot 5M. This is because clay is likely to be present between the cleats in the middle foot portion 5M, and it is preferable to reduce the ratio of the cleats.

Next, examples of FIGS. 11B to 11D will be described.
In these drawings, halftone dots are attached to the top surface T of each cleat. In addition, the surfaces that are perpendicular to or close to the base surface 5S, that is, the engagement surfaces 11E, 14E, 22E, 23E, 32E, 33E, 42E, and 43E, are drawn with thicker lines than the lines representing the other surfaces.

  In the example of FIG. 11B, fourth cleats 42 and 43 are provided in a region 5F2 posterior D2 from the line MP connecting the MP joints in the forefoot portion 5F. Of the fourth cleats 42 and 43, the inner fourth cleat 42 disposed on the inner side ME of the foot has an engagement surface 42E that faces the outer side LA of the oblique front D1. Out of the fourth cleats 42 and 43, the outer fourth cleat 43 disposed closer to the outer side LA of the foot than the inner fourth cleat 42 has an engagement surface 43E toward the inner ME of the oblique front D1.

  Central first cleats 10, 10 are arranged at the center inside and outside the front D1 with respect to the line MP connecting the MP joints of the front foot 5F. The center first cleat 10 has an engaging surface 10E extending substantially laterally. The engagement surface 10E faces rearward D2.

  In the front D1, the inner first cleat 11 has a larger angle θ11 (see FIG. 2) as the cleat in the rear D2 than the main ball O1 in the front foot 5F. The part of the first cleats 10 and 11 and the fourth cleats 42 and 43 in FIG. 11B are arranged around the main ball O1 in the forefoot portion 5F, and are connected to the line MP connecting the main ball O1 to the MP joint. It has engaging surfaces 10E, 11E, 42E, and 43E that face.

  In the example of FIG. 11C, the cleat is formed in a V shape. In the example of FIG. 11D, the cleat has a shape other than a square or a V-shape. Two or more types of cleats may be used.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the grooves G and G1 to G3 may not be provided. Further, grooves may be provided around the second cleats 22 and 23.
Accordingly, such changes and modifications are to be construed as within the scope of the invention as defined by the claims.

In addition to trail running, mountain climbing, and cross country use, the present invention can be used for walking, rain boots, and everyday shoe soles.

1F: Forefoot 1M: Middle leg 1R: Rear leg 4: Midsole 40: Midsole body 41: Strengthening device 5: Outsole
5F: Forefoot 5FR: Area behind MP1 5F2: Area behind MP 5M: Middle foot 5R: Rear foot 5S: Base surface 10: Central first cleat 11, 12: Inner first cleat 13, 14: Outer first cleat 10E to 14E: Engagement surface
15: Inner auxiliary cleat 16: Outer auxiliary cleat 15E, 16E: Engagement surface 21: Inner edge side second cleat 22: Inner second cleat 23: Outer second cleat 24: Outer edge side second cleat 21E-24E: Engagement surface 31, 32: Inner third cleats 33, 34: Outer third cleats 31E-34E: Engaging surface 42: Inner fourth cleat 43: Outer fourth cleat 42E, 43E: Engaging surface 100: Road surface BS: Rear surface FS: Front surface T: Top surface CL: Long axis NL: Normal line VL: Virtual line D1: Front D2: Back G: Groove G1: First groove G2: Second groove G3: Third groove H: Projection height S1: First 1 side S2: 2nd side S3: 3rd side ME: medial LA: lateral MP: line connecting the joints between the metatarsal joints MP1: first joint between the metatarsal joints O1: the base ball α1 to α3, β1 ~ Β3: Angle θ11 ~ θ1 4, θ22, θ23, θ31 to θ34: angle

Claims (34)

A rubber outsole 5 and a resin midsole 4 are provided. The plurality of first cleats 11 to 14, second cleats 22 and 23, and third cleats 31 protruding from the base surface 5 </ b> S of the outsole 5. In the soles arranged on the front foot part 5F, the middle foot part 5M and the rear foot part 5R,
Among the first cleats 11 to 14, the inner first cleats 11 and 12 disposed on the inner side ME of the foot have engagement surfaces 11E and 12E toward the outer side LA of the oblique rear D2,
Outer first cleats 13 and 14 disposed on the outer side LA of the first cleats 11 to 14 have engaging surfaces 13E and 14E toward the inner ME of the oblique rear D2,
Among the second cleats 22 and 23, the inner second cleat 22 disposed on the inner side ME of the foot has an engagement surface 22E toward the outer side LA of the oblique front D1,
Of the second cleats 22 and 23, the outer second cleat 23 disposed on the outer side LA of the foot has an engagement surface 23E toward the inner ME of the oblique front D1,
Among the third cleats 31 to 34, the inner third cleats 31 and 32 disposed on the inner side ME of the foot have engagement surfaces 31E and 32E toward the outer side LA of the oblique front D1,
Out of the third cleats 31 to 34, the outer third cleats 33 and 34 disposed on the outer side LA of the foot have engagement surfaces 33E and 34E toward the inner ME of the oblique front D1.   2. The shoe sole according to claim 1, wherein an angle α <b> 2 formed by at least one of the engagement surfaces 22 </ b> E and 23 </ b> E of the second cleats 22 and 23 and the base surface 5 </ b> S is a rear surface BS of the second cleats 22 and 23 and the base. It is the same as the angle β2 formed by the surface 5S, or an angle closer to a right angle than the angle β2.   3. The shoe sole according to claim 1, wherein an angle α <b> 3 formed by at least one of the engagement surfaces 31 </ b> E to 34 </ b> E of the third cleats 31 to 34 and the base surface 5 </ b> S is a rear surface BS of the third cleats 31 to 34. The angle is the same as the angle β3 formed by the base surface 5S or an angle closer to a right angle than the angle β3.   5. The shoe sole according to claim 1, wherein an angle α <b> 1 formed by at least one of the engagement surfaces 11 </ b> E to 14 </ b> E of the first cleats 11 to 14 and the base surface 5 </ b> S is the first cleat 11 to 11. 14 is the same as the angle β1 formed by the front surface FS and the base surface 5S, or an angle closer to a right angle than the angle β1.   5. The shoe sole according to claim 1, wherein the first, second, and third cleats 11 to 14, 22, 23, 31 to 34 protrude 2 to 10 mm from the base surface 5 </ b> S.   The shoe sole according to any one of claims 1 to 5, wherein an area of each top surface T to be grounded in each of the first, second and third cleats 11 to 14, 22, 23, 31 to 34 is 50 to 500. Square millimeter. The shoe sole according to any one of claims 1 to 6, wherein an angle formed between a normal line NL perpendicular to at least one of the engagement surfaces 22E and 23E of the second cleats 22 and 23 and a long axis CL of the foot. θ22 and θ23 are set to 15 ° to 45 °, and the areas of the engagement surfaces 22E and 23E are set to 20 to 500 square millimeters.   The shoe sole according to any one of claims 1 to 7, wherein an angle formed by a normal line NL perpendicular to at least one of the engagement surfaces 31E to 34E of the third cleats 31 to 34 and a long axis CL of the foot. θ31 to θ34 are set to 15 ° to 45 °, and the area of the engagement surfaces 31E to 34E is set to 20 to 500 square millimeters.   The shoe sole according to any one of claims 1 to 8, wherein an angle formed between a normal line NL perpendicular to at least one engaging surface 11E to 14E of the first cleats 11 to 14 and a long axis CL of the foot. θ11 to θ14 are set to 20 ° to 60 °, and the area of the engagement surfaces 11E to 14E is set to 20 to 500 square millimeters. 10. The shoe sole according to claim 1, wherein the midsole 4 includes a midsole body 40 and a reinforcing device 41 having a Young's modulus larger than that of the midsole body 40. Further, at least a part of the second cleats 22 and 23 is disposed. The shoe sole according to claim 10, wherein a plurality of the inner second cleats 22 are arranged apart from each other in the front-rear direction of the foot, and the inner side in front of the top surface T of the inner second cleat 22 in the rear D2 in an unloaded state. The top surface T of the second cleat 22 has a greater distance from the road surface,
A plurality of the outer second cleats 23 are arranged spaced apart from each other in the front-rear direction of the foot, and in a no-load state, the top surface T of the outer second cleat 23 ahead of the top surface T of the outer second cleat 23 in the rear D2. The distance from the road is larger. The sole according to claim 11, wherein the top surface T of the second cleats 22, 23 of the front D1 is not grounded in the unloaded state, and a value obtained by dividing a one-foot load by a foot size is 3 kg / cm. Ground in some cases. The shoe sole according to any one of claims 1 to 12, wherein the inner third cleats 31 and 32 are:
A plurality of cleats 32 near the center disposed at positions closer to the long axis CL of the foot than the inner edge of the outsole 5 and spaced apart from each other in the front-rear direction of the foot; and A plurality of cleats 31 closer to the inner edge disposed closer to the inner edge than the long axis CL;
The outer third cleats 33, 34 are
A plurality of cleats 33 located near the long axis CL of the foot than the outer edge of the outsole 5 and spaced apart from each other in the front-rear direction of the foot; And a plurality of cleats 34 closer to the outer edge than the major axis CL. 14. The shoe sole according to claim 13, wherein the cleat 32 closer to the center and the cleat 31 closer to the inner edge of the inner third cleats 31 and 32 are formed on the engaging surfaces 31E and 32E of the cleats 31 and 32, respectively. Are offset from each other in the direction of the vertical normal NL and are alternately arranged,
Of the outer third cleats 33 and 34, the cleat 33 closer to the center and the cleat 34 closer to the outer edge are offset from each other in the direction of the normal line NL perpendicular to the engagement surfaces 33E and 34E of the respective cleats 33 and 34. And are alternately arranged. 15. The shoe sole according to claim 14, wherein the central cleat 32 of the inner third cleats 31 and 32 and the central cleat 33 of the outer third cleats 33 and 34 are in the direction of the major axis CL. Are offset from each other. The shoe sole according to any one of claims 1 to 15, wherein the inner first cleats 11 and 12 are:
A plurality of cleats 12 located near the center of the foot and closer to the long axis CL of the foot than the inner edge of the outsole 5; A plurality of cleats 11 arranged closer to the inner edge than the major axis CL, and disposed closer to the inner edge,
The outer first cleats 13 and 14 are:
A plurality of cleats 13 near the center disposed at positions closer to the long axis CL of the foot than the outer edge of the outsole 5, and spaced apart from each other in the front-rear direction of the foot; and And a plurality of cleats 14 closer to the outer edge than the major axis CL. The shoe sole according to claim 16, wherein the cleat 12 closer to the center and the cleat 11 closer to the inner edge of the first inner cleats 11 and 12 are engaged with the engaging surfaces 11E and 12E of the cleats 11 and 12, respectively. Are offset from each other in the direction of the vertical normal NL and are alternately arranged,
Of the outer first cleats 13 and 14, the cleat 13 closer to the center and the cleat 14 closer to the outer edge are offset from each other in the direction of the normal line NL perpendicular to the engaging surfaces 13E and 14E of these cleats 13 and 14. And are alternately arranged.   The shoe sole according to claim 17, wherein the cleat 12 closer to the center of the inner first cleats 11 and 12 and the cleat 13 closer to the center of the first outer cleats 13 and 14 are in the major axis CL direction. Are offset from each other. The shoe sole according to any one of claims 16 to 18, wherein cleats 12 and 13 closer to the center of the first cleats 11 to 14 are engaging surfaces of the inner first cleat 12 disposed on the inner side ME of the foot. The area of the engaging surface 13E of the outer first cleat 13 disposed on the outer side LA is larger than that of 12E. The shoe sole according to any one of claims 16 to 19, wherein the inner first cleats 11 and 12 are surrounded by two cleats 11 and 11 near the inner edge and two cleats 12 and 12 near the center. An inner auxiliary cleat 15 disposed and having an engagement surface 15E on a surface intersecting with the engagement surfaces 11E, 12E of the inner first cleats 11, 12;
The outer first cleats 13, 14 are arranged in a region surrounded by the two outer cleats 14, 14 and the two central cleats 13, 13, and are engaged with the outer first cleats 13, 14. An outer auxiliary cleat 16 having an engagement surface 16E on a surface intersecting with 13E and 14E,
Each of the auxiliary cleats 15 and 16 is disposed apart from the first cleats 11 to 14. The shoe sole according to any one of claims 1 to 20, wherein a virtual line VL that extends smoothly back and forth along the long axis CL of the foot is set, and each of the inner cleats 11, 12, 22, 31, 32 is The outer cleats 13, 14, 23, 33, and 34 are arranged on the outer side LA of the virtual line VL. 23. The shoe sole according to claim 21, wherein the virtual is next to the cleats 12, 13, 32, 33 arranged close to the virtual line VL among the first and third cleats 11-14, 31-34. A first groove G1 is formed along the first side S1 closest to the line VL. The shoe sole according to claim 22, wherein a pair of second sides S2, S2 adjacent to the first side S1 of the cleats 12, 13, 32, 33 disposed close to the virtual line VL, A second groove G2 connected to the first groove G1 is formed. The shoe sole according to claim 21 , wherein a long groove G extending from the front foot portion 5F to the rear foot portion 5R along the virtual line VL is formed in the base surface 5S. The shoe sole according to any one of claims 1 to 24, wherein cleats 12 and 13 near the center of the first cleats 11 to 14, the second cleats 22 and 23, and the third cleats 31 to 34. Of these, the cleats 32 and 33 closer to the center are formed in a square plate shape. 13. The shoe sole according to claim 6, 11 or 12 , wherein the sum of the areas of the top surfaces T of the second cleats 22 and 23 having a height of 2 mm to 10 mm is obtained by projecting the middle foot portion 5M of the shoe sole onto a plane. 20% to 60% of the projected area. In any one of the shoe sole of claim 1 to 26, wherein the cleat 11 with a height of 2 Mm～10mm Te region 5FR odor rear D2 than the first metatarsophalangeal joint MP1 in the forefoot 5F The total area of the top surfaces T of ˜16 is 25% to 65% of the projected area obtained by projecting the region 5FR of the rear D2 of the shoe sole onto the plane. The shoe sole according to any one of claims 1 to 27, wherein fourth cleats 42 and 43 are provided in a region 5F2 posterior to the line MP connecting the joints between the metatarsal joints in the forefoot portion 5F. ,
Among the fourth cleats 42 and 43, the inner fourth cleat 42 disposed on the inner side ME of the foot has an engagement surface 42E toward the outer side LA of the oblique front D1,
Out of the fourth cleats 42 and 43, the outer fourth cleat 43 disposed on the outer side LA of the foot has an engagement surface 43E toward the inner ME of the diagonally forward D1. In the shoe sole according to claim 9, the angle θ11 of the inner first cleat 11 is larger in the front D1 than the main ball O1 in the front foot portion 5F as the cleat of the rear D2.   30. The shoe sole according to any one of claims 1 to 29, wherein a plurality of engagement surfaces 10E, 11E, 42E, and 43E facing the main ball O1 are provided around the main ball O1 in the front foot portion 5F. First and fourth cleats 10, 11, 42, 43 are further provided. In the shoe sole of any one of Claims 1-30, in the said midfoot part 5M,
An inner edge-side second cleat 21 having an engagement surface 21 </ b> E toward the outer side of the oblique front D <b> 1 and disposed closer to the inner edge than the inner second cleat 22;
It further includes an outer edge-side second cleat 24 that has an engagement surface 24 </ b> E that faces inward of the oblique front D <b> 1 and is arranged closer to the outer edge than the outer second cleat 23. The shoe sole according to claim 31, wherein the second cleat 21 closer to the inner edge is disposed further rearward than the rearmost inner second cleat 22 of the inner second cleats 22,
The outer edge-side second cleat 24 is disposed further rearward than the rearmost outer second cleat 23 of the outer second cleat 23. The shoe sole according to claim 31 or 32, wherein the rearmost inner second cleat 22 of the inner second cleats 22 and the innermost third cleat 32 of the inner third cleats 32 are between The cleats 22 and 32 are offset in the direction of the normal line NL perpendicular to the engagement surface 21E, and the second cleat 21 closer to the inner edge is disposed.
Between the outermost second cleat 23 of the outermost second cleat 23 and the outermost third cleat 33 of the outermost third cleat 33, the cleats 23, 33 are engaged with the engagement. The second cleat 24 closer to the outer edge is disposed offset in the direction of the normal line NL perpendicular to the mating surface 24E.   The shoe sole according to any one of claims 1 to 33, wherein the inner second cleat 22 and the outer second cleat 23 are arranged offset from each other in the long axis direction CL direction of the foot.

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