JP3308482B2 - Midsole structure for sports shoes and molding method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a midsole structure for a sports shoe and a method for molding the same, and more particularly, to a midsole formed of a soft elastic member and having a corrugated sheet incorporated therein.

[0002]

2. Description of the Related Art The sole of sports shoes used for various sports is a midsole (middle sole).
And an outsole attached to the lower surface thereof and directly in contact with the road surface. The midsole is generally formed of a soft elastic member in order to ensure cushioning as a shoe.

[0003] By the way, as sports shoes,
In addition to cushioning properties, running stability is required. That is, it is necessary to prevent the shoes from being excessively deformed in the left-right direction at landing and causing so-called lateral runout.

[0004] In order to prevent such a lateral vibration by incorporating a corrugated sheet in a midsole, the applicant of the present invention has proposed the same (Japanese Utility Model Publication No. Sho 61-6804).

In the above-mentioned publication, the corrugated sheet is built in the heel portion of the midsole, so that when the shoe lands, the heel portion of the midsole is prevented from laterally deforming laterally. Is generated, and as a result, the lateral swing of the heel portion of the shoe is prevented.

[0006] On the other hand, there is a difference in whether the frequency of landing from the inside of the heel or the frequency of landing from the outside of the heel is high depending on the competition event or the competitor.
For example, in the case of tennis or basketball, since there is much lateral movement, there is a strong tendency for the heel to fall outward by landing from the inside of the heel, causing so-called supination. In the case of running, since the load lands on the outside of the rear end of the heel and moves in the direction of the toe, the heel falls down inward, causing a so-called pronation.

[0007] The pronation or supination is a natural exercise that occurs when the foot lands, but if it is excessive, the pronation or supination is excessive and the supination or the supination is obstructed to the athlete's ankle, knee, waist, and the like. May be induced.

However, in the conventional midsole, a corrugated sheet having a constant wavy shape in both the front-back direction and the left-right direction of the heel portion is used, so that the compression hardness is constant over the entire midsole. As a result, it is not possible to effectively control the pronation or supination of the athlete's foot required according to the competition event.

Generally, by inserting a corrugated sheet, the heel portion of the midsole tends to be hardly deformed in the left-right direction. Further, when the corrugated sheet is made of a highly elastic material, the heel portion of the midsole is vertically It also tends to be less deformable in the direction. Therefore, when the corrugated sheet has a constant corrugated shape, the cushioning property at the time of landing may be reduced even in a region where cushioning is required in the heel portion of the midsole.

On the other hand, good cushioning is an indispensable condition in sports shoes,
When the cushioning property is enhanced, there is a possibility that the competitive power such as the propulsive power and the jumping power of the competitor may be absorbed.

The present invention has been made in view of such conventional circumstances, and prevents an athlete from swaying at the time of landing according to various types of sports to suppress over-pronation and over-pronation. It is another object of the present invention to provide a midsole structure for sports shoes that can achieve both cushioning at the time of landing and prevention of a decrease in playing power.

[0012]

According to a first aspect of the present invention, there is provided a midsole structure for a sports shoe, wherein a corrugated sheet is interposed at least in a heel portion in a midsole formed of a soft elastic member, and the corrugated sheet is provided. The amplitude of the wave shape of at least one of the wavelength is the heel portion
The feature is that it differs between the outer parts .

The sports shoe according to the second aspect of the present invention.
The midsole structure according to claim 1, wherein
At least one of the amplitude and wavelength of the wave shape of the plate
Is different between the front and rear ends of the heel.
It is characterized by.

According to a third aspect of the present invention, in the sports shoe midsole structure according to the first aspect, the wave-shaped amplitude of the corrugated sheet is small on the rear end side of the heel portion and is large on the front end side. It is characterized by having.

According to a fourth aspect of the present invention, in the midsole structure for a sports shoe according to the first aspect, the wave-shaped amplitude of the corrugated sheet is large on the inner side of the heel portion and smaller on the outer side. It is characterized by having.

According to a fifth aspect of the present invention, in the midsole structure for a sports shoe according to the fourth aspect , the wave-shaped wavelength of the corrugated sheet is larger on the inner side of the heel portion and smaller on the outer side. It is characterized by having.

According to a sixth aspect of the present invention, in the midsole structure for a sports shoe according to the fourth aspect , the wave-shaped wavelength of the corrugated sheet is larger on the outer side of the heel portion and smaller on the inner side. It is characterized by having.

According to a seventh aspect of the present invention, in the midsole structure for a sports shoe according to the first aspect, the amplitude of the corrugated shape of the corrugated sheet is larger on the outer side of the heel portion and smaller on the inner side. It is characterized by having.

In the midsole structure of a sports shoe according to an eighth aspect of the present invention, in the seventh aspect , the wave-shaped wavelength of the corrugated sheet is larger on the outer side of the heel portion and smaller on the inner side. It is characterized by having.

According to a ninth aspect of the present invention, in the midsole structure for a sports shoe according to the seventh aspect , the wave-shaped wavelength of the corrugated sheet is larger on the inner side of the heel portion and smaller on the outer side. It is characterized by having.

According to a tenth aspect of the present invention, in the midsole structure of the sports shoe, the corrugated sheet is interposed at least in the heel portion of the midsole formed of the soft elastic member, and the corrugated sheet has a corrugated amplitude. It is characterized in that it is large on the outer side of the heel portion and smaller on the central portion between the inner and outer portions of the heel portion.

In the midsole structure for sports shoes according to the eleventh aspect of the present invention, the corrugated sheet is interposed at least in the heel portion of the midsole formed of the soft elastic member, and the corrugated sheet has a corrugated phase. It is characterized in that there is a 波長 wavelength shift between the outer side of the heel portion.

A midsole structure for a sports shoe according to a twelfth aspect of the present invention is characterized in that, in any one of the first to eleventh aspects, the hardness of the corrugated sheet is higher than the hardness of the midsole. I have.

According to a thirteenth aspect of the present invention, there is provided a midsole structure for a sports shoe according to any one of the first to twelfth aspects, wherein the corrugated sheet is made of fiber reinforced plastic.

According to a fourteenth aspect of the present invention, the midsole structure of the sports shoe according to the thirteenth aspect is characterized in that the fibers of the fiber-reinforced plastic are fibers aligned in one direction.

According to a fifteenth aspect of the present invention, in the midsole structure for a sports shoe according to the fourteenth aspect , the fibers of the fiber-reinforced plastic are oriented in accordance with the direction of the corrugated ridge of the corrugated sheet. It is characterized by:

The midsole structure of a sports shoe according to the invention of claim 16 is the invention of claim 14 , wherein the fiber of the fiber-reinforced plastic is in a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet. It is characterized by being oriented.

In a midsole structure for a sports shoe according to a seventeenth aspect of the present invention, in the thirteenth aspect , the fiber of the fiber-reinforced plastic has a woven structure composed of a weft and a warp, and an elastic modulus of the weft is smaller. It is characterized in that it is greater than or equal to the elastic modulus of the warp.

The midsole structure of a sports shoe according to the invention of claim 18 is characterized in that, in claim 17 , the weft yarn is oriented in accordance with the direction of the corrugated ridge of the corrugated sheet. .

According to a nineteenth aspect of the present invention, in the midsole structure for a sports shoe according to the seventeenth aspect , the weft yarns are arranged at ± 3 with respect to the direction of the corrugated ridge of the corrugated sheet.
It is characterized by being oriented in the range of 0 °.

According to a twentieth aspect of the present invention, there is provided a midsole structure for a sports shoe according to any one of the first to thirteenth aspects, wherein a rib structure functioning as a rib is provided on a surface of the corrugated sheet. Features.

According to a twenty-first aspect of the present invention, in the midsole structure for a sports shoe according to the twentieth aspect , the rib structure is constituted by a plurality of ridges corresponding to the direction of the wave-shaped ridge. It is characterized by.

[0033] In the midsole structure of a sports shoe according to the invention of claim 22 , in any one of claims 1, 10 and 11 , the corrugated sheet is made of a thermoplastic or thermosetting resin and has an outer peripheral end face. A first corrugated sheet, which is arranged on the inside of the heel side wall surface of the shoe,
The second corrugated sheet is made of a soft elastic member having an elastic modulus smaller than that of the first corrugated sheet, and has an outer peripheral end surface formed of a second corrugated sheet arranged substantially flush with a heel side wall surface of the shoe. I have.

A midsole structure for a sports shoe according to the invention of claim 23 is characterized in that, in any one of claims 1 to 22 , a window hole is formed in a heel center portion of the midsole.

According to a twenty-fourth aspect of the present invention, there is provided a method for forming a midsole structure in which a corrugated sheet is interposed at least in a heel portion in a midsole of a sports shoe. A first flat sheet made of resin and having an outer peripheral end surface located inside the heel side wall surface of the shoe, and a soft elastic member having an elastic modulus smaller than that of the first flat sheet, and A step of laminating a second flat sheet whose outer peripheral end face is arranged substantially flush with the heel side wall surface of the shoe, and disposing the first and second flat sheets in a mold and performing thermoforming. The step of forming the first and second flat sheets into a corrugated shape to obtain a corrugated sheet.

According to a midsole structure of a sports shoe according to the twenty-fifth aspect of the present invention, a corrugated sheet is interposed in each of a heel portion and a forefoot portion in a midsole formed of a soft elastic member, and the corrugated sheets are attached to the midsole. It is characterized by being connected at the midfoot inside the midsole.

According to a twenty-sixth aspect of the present invention, in the midsole structure for a sports shoe according to the twenty-fifth aspect , the wave-shaped amplitude of the corrugated sheet at the heel portion is smaller on the inner side of the heel portion and is smaller on the outer side. It is characterized by having become large.

[0038] In a midsole structure for a sports shoe according to a twenty-seventh aspect of the present invention, in any one of the twenty- fifth and twenty- sixth aspects, the corrugated sheet portion in the forefoot portion is disposed only on the outer portion of the forefoot portion. It is characterized by.

The midsole structure for a sports shoe according to the invention of claim 28 , according to any one of claims 25 to 27 , wherein the amplitude of the wavy shape of the corrugated sheet in the forefoot part is on the inner side of the forefoot part. It is characterized by being smaller and larger on the outer side.

The midsole structure of a sports shoe according to the invention of claim 29, in any one of claims 25 to 28, the waveform shape of the wavelength of the corrugated sheet in the forefoot, at the inner side of the forefoot It is characterized by being smaller and larger on the outer side.

According to a thirtieth aspect of the present invention, in the midsole structure for a sports shoe according to any one of the twenty-fifth to twenty- ninth aspects, the connecting portion for connecting the corrugated sheets includes:
A rib structure that functions as a rib is provided.

According to a thirty-first aspect of the present invention, in the midsole structure for a sports shoe according to the thirtieth aspect , the rib structure is constituted by a plurality of concave portions or convex portions extending in a direction in which the connecting portions are arranged. It is characterized by.

According to a thirty-second aspect of the present invention, in the midsole structure for sports shoes according to any one of the twenty-fifth to thirty-first aspects, the hardness of the corrugated sheet is higher than the hardness of the midsole. I have.

A midsole structure for a sports shoe according to the invention of claim 33 is characterized in that, in any of claims 25 to 32 , the corrugated sheet is made of fiber reinforced plastic.

A midsole structure for a sports shoe according to a thirty-fourth aspect of the present invention is characterized in that, in the thirty-third aspect , the fibers of the fiber-reinforced plastic are fibers aligned in one direction.

According to a thirty-fifth aspect of the present invention, in the midsole structure for a sports shoe according to the thirty-fourth aspect , the fibers of the fiber-reinforced plastic are oriented in accordance with the direction of the corrugated ridge of each of the corrugated sheets. It is characterized by having.

According to a thirty- sixth aspect of the present invention, in the midsole structure for a sports shoe according to the thirty-fourth aspect , the fiber of the fiber-reinforced plastic is in a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet. It is characterized by being oriented in.

A thirty-seventh aspect of the present invention provides the midsole structure for a sports shoe according to the thirty-third aspect , wherein the fiber of the fiber-reinforced plastic is a woven structure composed of a weft and a warp, and the elastic modulus of the weft is It is characterized in that it is greater than or equal to the elastic modulus of the warp.

The midsole structure of a sports shoe according to the invention of claim 38, in claim 37, wherein the weft yarn is characterized in that it is oriented coincident with the waveform-shaped ridge direction of said corrugated sheets .

According to a thirty-ninth aspect of the present invention, in the midsole structure for a sports shoe according to the thirty-seventh aspect , the weft is formed so that the weft thread is oriented with respect to the direction of the wavy ridge of the corrugated sheet.
It is characterized by being oriented in a range of 30 °.

A midsole structure for a sports shoe according to a fortieth aspect of the present invention is characterized in that, in any one of the twenty-fifth to thirty-ninth aspects, a rib structure that functions as a rib is provided on the surface of the corrugated sheet. And

According to a forty-first aspect of the present invention, in the midsole structure for a sports shoe according to the forty- sixth aspect, the rib structure is constituted by a plurality of ridges which coincide with the direction of the ridge of the wavy shape. It is characterized by.

According to a forty-second aspect of the present invention, in the midsole structure for a sports shoe according to the twenty-fifth aspect , each of the corrugated sheets is made of a thermoplastic or thermosetting resin, and an outer peripheral end face of the midsole is formed on the side of the shoe. It is characterized in that it is arranged inside the wall surface.

A midsole structure for a sports shoe according to the invention of claim 43 is characterized in that, in any of claims 25 to 42 , a window hole is formed in the center of the heel of the midsole.

According to the first aspect of the present invention, the corrugated sheet is interposed at least in the heel portion in the midsole, and at least one of the amplitude and the wavelength of the corrugated shape of the corrugated sheet is between the inner and outer portions of the heel portion. Different in
According to the second aspect of the present invention, the corrugated sheet has a wavy shape.
At least one of the width and the wavelength is the heel portion.
It differs between the front and rear ends. Thereby, the following operation and effect can be obtained.

For example, if the amplitude of the wavy shape of the corrugated sheet is reduced in the heel portion, the flexibility of the midsole is maintained, the impact when the heel touches the ground is reduced, and the cushioning property is secured. On the other hand, if the amplitude of the wavy shape of the corrugated sheet is increased in the heel portion, the compression hardness of the midsole increases, preventing lateral deflection after landing and unnecessarily sinking the heel of the foot into the midsole Can be suppressed,
Competitive loss is reduced.

According to the third aspect of the present invention, since the amplitude of the corrugated sheet is small at the rear end of the heel portion of the midsole and large at the front end, the midsole of the midsole is small at the rear end of the heel having a small amplitude. Flexibility is maintained, and the compression hardness of the midsole increases at the front end side of the heel where the amplitude is large. This allows
In sports events that frequently touch the ground from the rear end of the heel,
The cushioning property can be ensured by effectively mitigating the impact at the time of landing, and the heel can be prevented from being deformed laterally after landing.

After the landing, when the load moves to the front end side of the heel having a high compression hardness, unnecessary sinking of the heel is suppressed, so that the player loses the competitive power when moving to the next operation. Can be reduced.

According to the fourth aspect of the present invention, the amplitude of the corrugated sheet is large on the inner side of the heel portion of the midsole and smaller on the outer side of the midsole. The flexibility of the midsole is increased on the inner side of the heel where the amplitude is large. This makes it possible to effectively reduce the impact at the time of landing and secure cushioning properties, and to prevent deformation in the heel lateral direction after landing in a sporting event in which landing frequently from the heel outer portion.

Further, when the heel of the foot is pronation after landing, the heel of the foot is prevented from unnecessarily sinking into the inner side of the midsole due to the inside of the heel having a high compression hardness. Can be prevented.

According to a fifth aspect of the present invention, in the fourth aspect ,
As the wave-shaped wavelength of the corrugated sheet is large on the inside part side of the heel part of the midsole and small on the outside part side,
In sports events that frequently land from the outside of the heel,
When landing sequentially from the heel portion to the toe portion of the shoe, the load-carrying path (load path) and the corrugated traveling path of the corrugated sheet can be substantially matched.
As a result, not only the lateral runout and excessive pronation in the heel portion can be reliably prevented, but also a large ground contact area can be secured at the time of landing, whereby the grip performance can be improved and the wear resistance of the shoe sole can be improved.

According to the invention of claim 6 , in claim 4 ,
As the wave-shaped wavelength of the corrugated sheet is larger on the outer side of the heel portion of the midsole and smaller on the inner side,
In sports events that frequently land from the inside of the heel,
When landing sequentially from the heel portion to the toe portion of the shoe, the load-carrying path (load path) and the corrugated traveling path of the corrugated sheet can be substantially matched.
As a result, not only the lateral runout and excessive overturning at the heel portion can be reliably prevented, but also a large ground contact area can be secured at the time of landing, whereby the grip performance can be improved and the abrasion resistance of the shoe sole can be improved.

According to the seventh aspect of the present invention, since the amplitude of the corrugation of the corrugated sheet is large on the outer side of the heel portion of the midsole and smaller on the inner side, the midsole on the heel inner side of the small amplitude is small. The compression hardness of the midsole is increased on the outer side of the heel where the amplitude is large. This makes it possible to effectively reduce the impact at the time of landing, secure cushioning properties, and prevent lateral deformation of the heel after landing in a sporting event in which landing frequently occurs from the inside of the heel.

Further, when the heel of the foot is spun out after landing, the heel of the foot is prevented from unnecessarily sinking into the outer side of the midsole by the heel outer portion having a large compression hardness. Can be prevented.

In the invention of claim 8 , in claim 7 ,
As the wave-shaped wavelength of the corrugated sheet is larger on the outer side of the heel portion of the midsole and smaller on the inner side,
In sports events that frequently land from the inside of the heel,
When landing sequentially from the heel portion to the toe portion of the shoe, the load-carrying path (load path) and the corrugated traveling path of the corrugated sheet can be substantially matched.
As a result, not only the lateral runout and excessive overturning at the heel portion can be reliably prevented, but also a large ground contact area can be secured at the time of landing, whereby the grip performance can be improved and the abrasion resistance of the shoe sole can be improved.

According to the ninth aspect of the present invention, in the seventh aspect ,
As the wave-shaped wavelength of the corrugated sheet is large on the inside part side of the heel part of the midsole and small on the outside part side,
In sports events that frequently land from the outside of the heel,
When landing sequentially from the heel portion to the toe portion of the shoe, the load-carrying path (load path) and the corrugated traveling path of the corrugated sheet can be substantially matched.
As a result, not only the lateral runout and excessive pronation in the heel portion can be reliably prevented, but also a large ground contact area can be secured at the time of landing, whereby the grip performance can be improved and the wear resistance of the shoe sole can be improved.

According to the tenth aspect of the present invention, the corrugated sheet is interposed at least in the heel portion in the midsole, and the amplitude of the corrugated shape of the corrugated sheet is large on the inside and outside of the heel portion. It is smaller at the center between the outer parts.

As a result, the flexibility of the midsole is maintained at the central portion of the heel having a small amplitude, and the compression hardness of the midsole is increased at the inside and outside of the heel having the large amplitude. As a result, the cushioning property at the time of landing on the heel can be ensured at the center of the heel, and deformation in the lateral direction of the heel after landing can be prevented, and the stability can be improved.

According to the eleventh aspect of the present invention, the corrugated sheet is interposed at least in the heel portion in the midsole, and the wave-shaped phase of the corrugated sheet is one between the inside and the outside of the heel portion.
/ 2 wavelength shift.

As a result, with respect to the wave shape from the inside of the heel to the outside of the heel, the amplitude gradually decreases as the peak of the wave on the inside of the heel moves toward the outside of the heel. The amplitude becomes zero at the central portion between the outer portions, and gradually increases toward the outer side from the central portion toward the outer side of the heel, and is located at the trough of the wave on the outer side of the heel.

Similarly, regarding the wave shape from the outer side of the heel to the inner side of the heel, the amplitude gradually decreases as the wave peak portion on the outer side of the heel moves toward the inner side of the heel. The amplitude becomes zero at the central portion between the outer portions, and gradually increases from the central portion toward the inside of the heel toward the inside of the heel.

As described above, the amplitude of the wave-shaped wave at the central portion between the inside and the outside of the heel is zero,
As in the case of the tenth invention, the flexibility of the midsole is maintained in the central portion between the inside and the outside of the heel, and the compression hardness of the midsole increases in the inside and outside of the heel having relatively large amplitude. As a result, the cushioning property at the time of landing on the heel can be ensured at the center of the heel, and deformation in the lateral direction of the heel after landing can be prevented, and the stability can be improved.

According to the twelfth aspect of the present invention, the first to first aspects are provided.
1 , the hardness of the corrugated sheet is higher than the hardness of the midsole. Generally, when an impact load is repeatedly applied to the midsole when the shoe lands, the corrugated sheet is repeatedly deformed together with the midsole, and as a result, the midsole gradually loses its elasticity and easily becomes sagged. On the other hand, when the hardness of the corrugated sheet is set high, the midsole becomes difficult to settle due to the resilience of the corrugated sheet, so the impact at the time of landing can be reduced even during long-term use, and the cushioning property is secured. it can.

According to the thirteenth aspect, the first to the first aspects
In any one of 2, the corrugated sheet is composed of fiber reinforced plastic (FRP) using, for example, carbon fiber, aramid fiber, glass fiber, or the like as a reinforcing fiber and a thermosetting resin or a thermoplastic resin as a matrix resin. The elasticity and durability of the corrugated sheet are improved, and the corrugated sheet can withstand long-term use.

[0075] Fibers of the fiber reinforced plastic, as in the invention of claim 14 is preferably a fiber that has been aligned in one direction.

According to the fifteenth aspect , since the fibers of the fiber-reinforced plastic are oriented in accordance with the direction of the corrugated ridge of the corrugated sheet, the elasticity in the direction perpendicular to the ridge is not excessively increased. , The elasticity in the direction of the ridge can be selectively improved.

[0077] The fibers of the fiber reinforced plastic, as in the invention of claim 16, it may be oriented in a range of ± 30 ° with respect to the corrugated ridge direction of the corrugated sheet.

Further, as in the seventeenth aspect , the fiber of the fiber-reinforced plastic is a woven structure composed of a weft and a warp, and the elastic modulus of the weft is greater than or equal to the elastic modulus of the warp. Is also good.

The weft yarn of this weaving structure is as defined in claim 18 or 1
As in the invention of the ninth aspect , the corrugated sheet is oriented so as to coincide with the direction of the corrugated ridge, or is oriented in a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet. Is preferred.

According to the twentieth aspect, the first to the first aspects
In any one of ( 3) and (8), the rib structure is provided on the surface of the corrugated sheet, so that the elasticity of the corrugated sheet can be appropriately changed.

[0081] The rib structure, as in the invention of claim 21 is preferably is composed of a plurality of convex portions that coincide with the direction of the wave-shaped ridges, in this case, perpendicular to the ridge The elasticity in the direction of the ridge can be selectively improved without excessively increasing the elasticity of the ridge.

According to the twenty-second aspect of the present invention, the corrugated sheet is made of a thermoplastic or thermosetting resin, and the outer peripheral end surface of the corrugated sheet is arranged inside the heel side wall surface of the shoe; And a second corrugated sheet whose outer peripheral end surface is arranged substantially flush with the heel side wall surface of the shoe.

As described above, since the outer dimensions of the first corrugated sheet are made smaller than the outer dimensions of the heel side wall surface, the first corrugated sheet having a large elastic modulus and being hardly deformed can be easily placed in the cavity of the mold. Being able to be inserted makes molding easier.

On the other hand, since the outer peripheral end surface of the first corrugated sheet is disposed inside the heel side wall surface, the first corrugated sheet exhibits a function of substantially suppressing deformation of the midsole after molding.
The outer peripheral end surface of the corrugated sheet is buried in the side wall surface of the heel and becomes difficult to see from the outside. However, since the outer dimensions of the second corrugated sheet that is in close contact with the first corrugated sheet are substantially the same as the outer dimensions of the heel side wall surface, the outer peripheral end surface of the second corrugated sheet is visible from the outside even after molding.

Therefore, the purchaser and the user of the shoes can recognize the presence of the corrugated sheet from the second corrugated sheet, thereby improving the beauty of the product.

Although the outer dimensions of the second corrugated sheet before molding are generally larger than the dimensions of the cavity of the mold, the second corrugated sheet is made of a soft elastic member, so that its elastic modulus is small and deformed. It does not hinder insertion into the cavity.

According to the twenty- third aspect of the present invention, the first to second aspects are provided.
In any one of the above two , since the window hole is formed in the central portion of the heel of the midsole, the compression hardness of the midsole structure in the central portion of the heel is reduced by the compression hardness carried by the midsole. . Thereby, a sufficient cushioning property can be obtained in the central part of the heel.

According to the twenty-fourth aspect, a first flat sheet made of a thermoplastic or thermosetting resin and having an outer peripheral end surface located inside the heel side wall surface of the shoe, A second flat sheet made of a soft elastic member having a lower elastic modulus than the elastic sheet and having an outer peripheral end surface substantially flush with a heel side wall surface of the shoe is laminated, and the first and second flat sheets are laminated. By arranging the flat sheet in a mold and performing thermoforming, the first and second flat sheets are formed into a corrugated shape to obtain a corrugated sheet.

As described above, by making the outer dimensions of the first flat sheet smaller than the outer dimensions of the heel side wall surface,
The first flat sheet having a large elastic modulus and being hardly deformed can be easily inserted into the cavity of the mold, thereby facilitating molding.

On the other hand, by forming the outer peripheral end surface of the first flat sheet inside the heel side wall surface, the first flat sheet is formed so as to substantially exhibit the function of suppressing the deformation of the midsole. The rear outer peripheral surface is buried in the heel side wall surface and becomes difficult to see from the outside. However, since the outer dimensions of the second flat sheet that is in close contact with the first flat sheet are substantially the same as the outer dimensions of the heel side wall surface, the outer peripheral end surface of the second flat sheet is visible from the outside even after molding.

Therefore, the purchaser and the user of the shoe can recognize the presence of the corrugated sheet from the formed second flat sheet, thereby improving the beauty of the product.

Although the outer dimensions of the second flat sheet are generally larger than the dimensions of the cavity of the mold, the second flat sheet is formed of a soft elastic member, so that its elastic modulus is small and deformed. Easy to insert into the cavity.

According to the twenty-fifth aspect of the present invention, the corrugated sheet is interposed in the heel portion and the forefoot portion in the midsole, and the corrugated sheets are connected by the middle foot portion in the midsole. With this configuration, the following operation and effect can be obtained.

That is, when the shoe lands, the portion from the heel portion to the forefoot portion of the midsole is unlikely to be laterally displaced and deformed laterally. As a result, not only the heel portion (ie, the rear foot portion) but also the forefoot portion Shake is prevented.

[0095] corrugated amplitude of the corrugated sheet in the heel, as in the invention of claim 26, preferably larger in smaller and outer side by the inner side of the heel part. In this case, since the compression hardness of the midsole on the outer side of the heel is increased, it is possible to prevent the heel of the foot from unnecessarily sinking on the outer side of the midsole after landing.

The corrugated sheet portion in the forefoot portion is
As in the twenty-seventh aspect of the present invention, it is preferable to be arranged only on the outer part of the forefoot.

[0097] Further, the wave shape of the amplitude of the corrugated sheet in the forefoot, as in the invention of claim 28, preferably larger in smaller and outer side by the inner side of the forefoot. In this case, since the compression hardness of the midsole on the outer side of the forefoot is increased, it is possible to prevent the forefoot of the foot from unnecessarily sinking on the outer side of the midsole after landing.

[0098] corrugated wavelength of the corrugated sheet in the forefoot, as in the invention according to claim 29, preferably larger in smaller and outer side by the inner side of the forefoot. In this case, after the player lands on the outer side of the forefoot, when the athlete steps inward the next step, the load-carrying path (load path) almost coincides with the corrugated traveling path of the corrugated sheet. It becomes possible to do. As a result, not only can the lateral deflection of the forefoot portion be reliably prevented, but also the bendability in the stepping-out direction at the time of running out is improved, and as a result, smooth running out is achieved while maintaining accurate gripping properties.

According to the thirtieth aspect, in the twenty-fifth to thirteenth aspects,
In any one of 29 , since the rib structure is provided at the connecting portion connecting the corrugated sheets, a shank effect can be exerted by the rib structure, whereby the rigidity of the middle foot portion (the arch portion) can be improved. .

This rib structure is preferably constituted by a plurality of concave portions or convex portions extending in the direction in which the connecting portions are arranged, as in the invention of the thirty-first aspect , whereby the structure can be simplified.

In the invention of claim 32 , claims 25 to 25
31. In any one of the embodiments, the hardness of the corrugated sheet is higher than the hardness of the midsole, so that the midsole with the built-in corrugated sheet can be hardly bent.

In the invention of claim 33 , claims 25 to
32 , the corrugated sheet is made of fiber reinforced plastic (FRP), so that the elasticity and durability of the corrugated sheet can be improved, and the corrugated sheet can be used for a long time.

[0103] Fibers of the fiber reinforced plastic, as in the invention of claim 34 is preferably a fiber that has been aligned in one direction.

According to the thirty-fifth aspect , the fibers of the fiber-reinforced plastic are oriented in accordance with the direction of the corrugated ridge of the corrugated sheet, so that the elasticity in the direction perpendicular to the ridge is not excessively increased. , The elasticity in the direction of the ridge can be selectively improved.

[0105] The fibers of the fiber reinforced plastic, as in the invention of claim 36, it may be oriented in a range of ± 30 ° with respect to the direction of ridges of the corrugated sheet.

[0106] Further, as in the invention of claim 37, the fibers of the fiber reinforced plastic is a weave comprising a weft and a warp, or or a comparable weft modulus greater than the elastic modulus of the warp yarns Is also good.

[0107] The weft of this woven structure is as defined in claim 38 or 3.
As in the invention of the ninth aspect , the corrugated sheet is oriented so as to coincide with the direction of the corrugated ridge, or is oriented in a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet. Is preferred.

According to the forty- ninth aspect, the twenty-fifth to twenty-fifth aspects are described.
In any one of 39 , the rib structure is provided on the surface of the corrugated sheet, so that the elasticity of the corrugated sheet can be appropriately changed.

[0109] The rib structure, as in the invention of claim 41 is preferably is composed of a plurality of convex portions that coincide with the direction of the wave-shaped ridges, in this case, perpendicular to the ridge The elasticity in the direction of the ridge can be selectively improved without excessively increasing the elasticity of the ridge.

In the invention according to claim 42 , the corrugated sheet is made of a thermoplastic or thermosetting resin, and the outer peripheral end face is arranged inside the side wall face of the shoe. Can be easily inserted into the cavity, and molding is facilitated.

According to the invention of claim 43 , claims 25 to
In any of 42 , since the window hole is formed in the center portion of the heel of the midsole, the compression hardness of the midsole structure in the center portion of the heel is reduced by the compression hardness carried by the midsole. . Thereby, a sufficient cushioning property can be obtained in the central part of the heel.

[0112]

[ Overview of the entire midsole structure ]

FIGS. 1 and 2 show sports shoes in which the midsole structure according to the first and second aspects of the present invention is employed, respectively. The sports shoes 1 shown in FIG. 1 are running shoes mainly used for running, and the sports shoes 1 'shown in FIG. 2 are, for example, tennis shoes, basket shoes or volleyball shoes. The same reference numerals in each drawing indicate the same or corresponding parts.

The soles of the sports shoes 1 and 1 ′ have a midsole (middle sole) 3 to which the lower part of the upper part 2 is attached.
And a corrugated sheet 4 interposed in the midsole 3 and having a corrugated shape, and an outsole 5 bonded to the lower surface of the midsole 3 and directly in contact with the road surface.

The midsole 3 is used to alleviate the impact applied to the bottom of the shoe 1 at the time of landing, and is arranged so as to sandwich the corrugated sheet 4 from above and below as shown in the exploded view of FIG. Upper midsole 3
a and the lower midsole 3b.

The material for forming the midsole 3 is as follows.
In general, a soft elastic member that is a material having good cushioning properties is used. Specifically, a foam of a thermoplastic synthetic resin such as an ethylene-vinyl acetate copolymer (EVA) or a polyurethane (PU) is used. Of a thermosetting resin, or a foam of a rubber material such as butadiene rubber or chloroprene rubber.

When the midsole structure according to the present invention is applied to a general running shoe, the foam forming the midsole 3 has a tensile modulus of 1 to 100 k.
g / cm ² , preferably about 10 kg / cm ² is used.

The corrugated sheet 4 is made of a thermoplastic resin such as thermoplastic polyurethane (TPU), polyamide elastomer (PAE) or ABS resin, which is a material having relatively high elasticity, or a thermosetting resin such as epoxy resin or unsaturated polyester resin. It is composed of resin.

[0118] When applying the present midsole structure typical running shoe, as the corrugated sheet 4, tensile modulus 100~50000kg / cm ^2, preferably about a thickness of about 1mm heat at about 1000 kg / cm ² A plastic polyurethane sheet is used.

Although not clearly shown in FIGS. 1 and 2, in the sports shoes 1 shown in FIG. 1, the corrugated sheet 4 is disposed on the heel portion in the midsole 3 as described later. On the other hand, in the sports shoe 1 'shown in FIG. 2, the corrugated sheet 4 is disposed on the heel portion (that is, the rear foot portion) and the front foot portion in the midsole 3.

[Operation and Effect of Midsole Structure ] In the midsole structure according to the present invention, the corrugated sheet 4 is sandwiched between the upper midsole 3a and the lower midsole 3b, and the whole is integrated. In the midsole structure having such a configuration, when the shoe lands, the pressure applied from the upper midsole 3a is dispersed by the corrugated sheet 4, so that the pressure receiving area of the lower midsole 3b increases, and as a result, the entire midsole structure Has increased compression hardness.

The compression hardness is determined by the flexural rigidity EI (E: longitudinal elastic modulus, I: second moment of area) of the material forming the corrugated sheet 4. Here, a coordinate system as shown in FIG.
Consider a state in which a bending moment M around an axis is acting.

When the corrugated sheet 4 has a thickness t, the sheet having the amplitude A,
Assuming that the wave sheet 4 is bent in a sine wave shape with a wavelength λ, the yz section of the corrugated sheet 4 is as shown in FIG. The waveform of this cross section can be expressed as in Equation 1.

(Equation 1)

Now, assuming that the total length of the corrugated sheet 4 is L, L
= Nλ (n: natural number), the neutral axis of this section is y = 0. Assuming that the small area on the cross section is ds, the second moment of area I with respect to the neutral axis of the cross section is as shown in Expression 2.

(Equation 2)

Here, t = 1 (mm), L = 100 (m
FIG. 6 shows the relationship between the wavelength λ, the amplitude A, and the second moment of area I when m). As can be seen from FIG. 6, when the wavelength λ exceeds a certain value, only the amplitude A contributes to the second moment of area I, and the wavelength λ hardly contributes.

When this is confirmed from the equation, when λ≫A in equation (2), equation (2) becomes equation (3).

(Equation 3)

This means that when the wavelength λ is sufficiently larger than the amplitude A, the second moment of area I is proportional to the square of the amplitude A, but the wavelength λ has no effect on the second moment of area I. I have.

On the other hand, in the case of A 数 式 λ, Expression 2 becomes Expression 4.

(Equation 4) This means that when the wavelength λ is sufficiently smaller than the amplitude A, the second moment of area I is proportional to the cube of the amplitude A and inversely proportional to the wavelength λ.

Actually, the influence of the amplitude A and the wavelength λ on the second moment of area I is intermediate between the above equations 3 and 4, and in any case, the influence on the second moment of area I The influence of the amplitude A is extremely large as compared with the wavelength λ.

Next, the relationship between the bending rigidity EI of the corrugated sheet 4 and the cushioning property of the midsole 3 incorporating the corrugated sheet 4 is shown in FIG. In the figure, the vertical axis C is a cushion coefficient, which is compared with a reference value of 100, which is the amount of compressive deformation when a predetermined load is applied to the midsole 3 where the corrugated sheet 4 is not interposed. This shows the cushioning properties of the midsole 3 with the corrugated sheet 4 interposed. As shown in the figure, it can be seen that as the bending rigidity EI increases, the cushion coefficient C decreases and the cushioning property deteriorates, but the stability improves.

Therefore, in the region where stability during landing is required in the midsole 3, the amplitude A is increased and the wavelength λ is decreased, so that the second moment of area I, that is, the bending stiffness EI is increased, and the compression hardness is increased. On the contrary, in the midsole area where cushioning is required, the amplitude A is reduced and the wavelength λ is increased, so that the second moment of area I, that is, the bending stiffness EI is reduced to decrease the compression hardness. .

As described above, by appropriately adjusting the amplitude A and the wavelength λ, the bending rigidity EI of the corrugated sheet 4 can be adjusted, whereby the compression hardness of the entire midsole structure can be adjusted.

Since the compression hardness of the entire midsole structure is substantially determined by the amplitude A rather than the wavelength λ of the corrugated sheet 4, the compression hardness is adjusted exclusively by the amplitude A, and the deformation characteristics of the midsole structure (ie, The adjustment of how the midsole structure deforms along the wavy ridge line or valley line of the corrugated sheet at the time of landing) may be performed by the wavelength λ.

[ Molding Method of Midsole Structure ] The above-mentioned midsole structure is formed as follows. The numerical values in the following description are merely examples, and it goes without saying that the present invention is not limited to these numerical values.

< Method 1 > The lower midsole 3b will be formed after molding.
A flat sheet 3b '(FIG. 8) made of a soft elastic member having a thickness of about 10 to 20 mm is cut, for example, along the outer shape of the heel.

Further, a flat sheet 4 ′ made of a thermoplastic resin or a thermosetting resin having a thickness of about 0.5 to 2 mm, which constitutes a substantial (functional) corrugated sheet 4 after molding (see FIG. 8) is cut into a shape slightly smaller than the outer shape of the heel, and forms an apparent (appearance) corrugated sheet 4 after molding. The thickness is 0.5 to 2 mm.
A flat sheet 4 ″ made of a soft elastic member of a degree (FIG. 8)
Is cut along the outer shape of the heel.

It should be noted that the flat sheet 4 "is attached to the flat sheet 3b 'so that the outer peripheral end face of the flat sheet 4" can be identified from the outer peripheral end face of the lower midsole 3b after molding.
It is preferable that a different color is colored or a different pattern is provided.

Next, the flat sheets 4 'and 4 "are adhered to the upper surface of the flat sheet 3b' (see FIG. 8), and these flat sheets 3b 'and the flat sheets 4' and 4" are recessed. It is inserted into the concave portion 10a of the mold (cavity) 10 (see FIG. 9). Although FIG. 8 shows a case where the flat sheets 4 'and 4 "are sequentially arranged on the flat sheet 3b', the arrangement of the flat sheets 4 'and 4" may be reversed.
8 and 9, the thicknesses of the flat sheets 4 'and 4 "are exaggerated for convenience of illustration (the same applies to FIGS. 10 to 13 below).

Outside dimensions d1 of flat sheets 3b 'and 4 "
Are larger than the inner dimension D of the concave portion 10a of the cavity 10, but each flat sheet 3b 'made of a soft elastic member.
And 4 ″ have low elastic modulus and are easily deformed.
At the time of insertion into Oa, each flat sheet 3b 'and 4 "is easily inserted into recess 10a.

On the other hand, since the flat sheet 4 'is made of a thermoplastic resin or a thermosetting resin, it has a large elastic modulus and is hardly deformed, but its outer dimension d2 is slightly smaller than the inner dimension D of the recess 10a. Therefore, the flat sheet 4 ′ is
It is similarly easily inserted into a.

Next, a convex mold (core) 12 having a wavy surface 12a on the lower surface is inserted into the concave portion 10a of the cavity 10 and heated and pressed (see FIGS. 9 and 10). After this thermoforming, when the core 12 is retracted, the flat sheet 3
lower midsole 3 having a corrugated surface formed on the upper surface of b '
b as well as each flat sheet 4 'and 4 "
Is obtained in a wavy shape (see FIG. 11).

On the other hand, in the same manner as in the case of the lower midsole 3b, a flat sheet made of a soft elastic member and having a thickness of about 10 to 20 mm is cut along the outer shape of the heel.
Then, by inserting the cut one into a mold in which one mold has a corrugated surface and applying heat and pressure,
An upper midsole 3a having a flat upper surface and a wavy lower surface is formed by a thermoforming method. The maximum thickness of the upper midsole 3a after molding is set to about 10 to 15 mm.

Next, the corrugated surface of the upper midsole 3a formed as described above is brought into close contact with the corrugated sheet 4 on the lower midsole 3b, and the two are adhered and integrated, whereby the midsole according to the present invention is obtained. A sole structure is formed (see FIGS. 12 and 13).

By the way, before the lower midsole 3b and the corrugated sheet 4 are thermoformed, as described above, the outer peripheral end face of the flat sheet 4 'is located more inward than the outer peripheral end faces of the flat sheets 3b' and 4 ". Due to the retreat, the outer peripheral end surface of the flat sheet 4 'constituting the substantially corrugated sheet 4 is buried in the lower midsole 3b and the outer peripheral end surface of the flat sheet 4 "after the thermoforming, so that it is difficult to see from the outside. Become.

However, the formed outer peripheral end surface of the flat sheet 4 "which is in close contact with the flat sheet 4 'is arranged substantially flush with the side wall surface of the heel, and the flat sheet 4" is different from the lower midsole 3b. Because of the color or pattern, the corrugated sheet 4
Can be recognized by the flat sheet 4 ″. Thereby, the beauty of the product can be improved.

FIGS. 8 to 13 show examples in which the corrugated sheet 4 is composed of a flat sheet 4 'made of a thermoplastic resin or a thermosetting resin and a flat sheet 4 "made of a soft elastic member. However, the corrugated sheet 4 may be composed of only the flat sheet 4 '.

In this case, it is preferable to increase the outer dimension of the flat sheet 4 'so that the outer peripheral end surface of the formed flat sheet 4', that is, the corrugated sheet 4, can be seen from the outside. However, since the flat sheet 4 'has a large elastic modulus and is difficult to be deformed, if the outer dimension of the flat sheet 4' is increased, the outer periphery of the flat sheet 4 'cannot fit into the concave portion of the cavity. Burrs will be generated on the outer periphery. Therefore, it is necessary to remove the burrs.

< Method 2 > In method 1, an example in which the flat sheet constituting the corrugated sheet 4 is bonded to the upper surface of the lower midsole 3b, and then the upper surface of the lower midsole 3b and the flat sheet are formed into a corrugated shape. Although shown, the application of the present invention is not limited to this.

After the upper surface of the lower midsole 3b and the corrugated sheet are separately formed into a corrugated shape, the corrugated sheet 4 is sandwiched between the lower surface of the upper midsole 3a and the upper surface of the lower midsole 3b, and these are bonded and fixed. You may make it.

That is, in this case, the thickness is 10 to 20.
A flat sheet made of a soft elastic member of about mm is cut along the outer shape of, for example, a heel (or a heel, a middle foot, and a forefoot). The upper midsole 3a having a substantially flat upper surface and a corrugated lower surface is formed by a thermoforming method by inserting into a metal mold having the surface and applying heat and pressure. The maximum thickness of the upper midsole 3a after molding is 5 to 7
mm.

Similarly, a flat sheet made of a soft elastic member having a thickness of about 10 to 20 mm is cut along the outer shape of the heel. The lower midsole 3b having a substantially flat lower surface and a corrugated upper surface is formed by a thermoforming method by inserting into a metal mold having the surface and applying heat and pressure. The maximum thickness of the lower midsole 3b after molding is 10 to
It is set to about 15 mm.

On the other hand, the corrugated sheet 4 may be formed by a thermoforming method or an injection molding method. In the case of molding by the thermoforming method, a flat sheet 4 ′ and 4 ″ similar to that described in Method 1 are overlapped (or only the corrugated sheet 4 ′), and both molds are corrugated. The corrugated sheet 4 is molded by inserting it into a mold having a surface and applying heat and pressure, and when molding by an injection molding method, the molten thermoplastic resin is injected into an injection mold having a corrugated surface. , The corrugated sheet 4 is formed.

Next, the corrugated sheet 4 is sandwiched between the corrugated surface on the lower surface side of the upper midsole 3a and the corrugated surface on the upper surface side of the lower midsole 3b. A midsole structure is formed by closely adhering and integrating with each corrugated surface of 3b.

< Method 3 > Method 3 is a completely different method from the above methods 1 and 2. First, the corrugated sheet 4 is molded by a thermoforming method or an injection molding method, and the molded corrugated sheet 4 is molded. Placed inside. Next, the polyurethane foam raw material mixed in advance is poured into a mold and foamed in the mold. Thereby, the upper midsole 3a and the lower midsole 3b are formed integrally with the upper and lower surfaces of the corrugated sheet 4, and a midsole structure is formed.

In the midsole structure molded by the molding method described above, the outsole 5 is bonded to the lower surface of the lower midsole 3b to form a shoe sole. The outsole 5 is mainly made of solid rubber, and has a non-slip groove or projection on its ground surface.

In order to increase rigidity, a shank member made of a rigid resin or a metal may be provided on the inner and outer portions of the midfoot portion (arch portion) of the midsole structure. Further, a member such as a stabilizer may be installed between the upper part 2 and the upper midsole 3a bonded to the upper surface of the upper midsole 3a for the purpose of improving the stability of the heel part.

[ Theory of the Preferred Embodiment in the Sports Shoes 1 ]
Akira ] Next, a sports shoe 1 according to the first invention of the present invention
A preferred embodiment of the midsole structure in FIG. 1 will be described with reference to FIGS. In each of these figures, the corrugated sheet 4
Are shown, and the waveforms of the waveform λ and the amplitude A of the corrugated sheet 4 are appropriately changed in each figure.

In FIGS. 14 to 21 and 24,
(A) is a plan view of the midsole structure on the left foot side in each embodiment, (b) is an outer side view, and (c) is an inner side view. In each figure, for convenience of illustration, the amplitude A is doubled, and the wavelength λ is halved. FIG. 22 is an enlarged view of the heel part of FIG. 21,
FIG. 23 is a view on arrow B of FIG. 22, FIG. 25 is an enlarged view of the heel part of FIG. 24, and FIG. 26 is a view on arrow C of FIG. Further, FIG.
8, (a) is a bottom view of the midsole structure on the left foot side,
(B) is the XX sectional drawing.

< First Embodiment > FIG. 14 is a view for explaining a midsole structure according to a first embodiment of the present invention. As shown in the figure, when the amplitudes of the corrugated sheet 4 at the front and rear ends of the heel portion are A ₁ and A ₂ , respectively, in the first embodiment, 2A ₁ > 2A _2, that is, A ₁ >. relationship of a _2.

As described above, by increasing the corrugated amplitude of the corrugated sheet 4 at the rear end side of the heel portion and increasing it at the front end side of the heel portion, the flexibility of the mid sole 3 is maintained at the rear end side of the heel having the small amplitude. The compression hardness of the midsole 3 increases on the heel front end side where the amplitude is large. This makes it possible to effectively cushion the impact at the time of landing and secure cushioning properties, and to prevent the heel portion from being deformed in the lateral direction after the landing, in an event where the frequency of contact with the heel rear end is high.

Further, after the landing, when the load moves to the front end side of the heel having a high compression hardness, unnecessary sinking of the heel is suppressed, so that the player loses the competitive power when moving to the next operation. Can be reduced.

< Second Embodiment > FIG. 15 is a view for explaining a midsole structure according to a second embodiment of the present invention. As shown in the figure, the waveform shape of the heel portion of the corrugated sheet 4, respectively the amplitudes A _i in the outer side, when the A _o, in this second embodiment 2A _i> 2A _o i.e. A _i> a relationship of a _o.

As described above, by increasing the amplitude of the corrugated shape of the corrugated sheet 4 on the inner side of the heel portion and decreasing the amplitude on the outer side, the midsole 3 on the outer side of the heel having a small amplitude.
And the compression hardness of the midsole 3 is increased on the inner side of the heel where the amplitude is large. As a result, in sports where the landing frequently occurs from the outside of the heel, the impact during landing can be effectively reduced by the outside of the heel of the midsole to ensure cushioning, and the foot falls down to the inside of the heel after landing. Can be supported by the inside of the heel of the midsole, preventing lateral deformation of the heel after landing.

Also, when the heel of the foot is pronation after landing, the heel of the foot is prevented from unnecessarily sinking into the inner side of the midsole due to the inside of the heel having a high compression hardness. Can be prevented.

< Third Embodiment > FIG. 16 is a view for explaining a midsole structure according to a third embodiment of the present invention. In the third embodiment, there is a relationship of A _i > A _o as in the second embodiment.

Further, in the third embodiment, when the wavelengths of the corrugated sheet 4 inside and outside the heel portion are λ _i and λ _o , respectively, λ _i / 2> λ _o / 2, that is, λ _{i> λ o} relationship of.

In this case, since the amplitude of the corrugated shape of the corrugated sheet 4 is large on the inner side of the heel portion and smaller on the outer side, the same as in the second embodiment,
Cushioning properties can be ensured in sports events where landing frequently from the outside of the heel, and lateral deformation of the heel after landing can be prevented.

Furthermore, in this case, since the wavelength of the corrugated shape of the corrugated sheet 4 is large on the inner side of the heel portion and smaller on the outer side thereof, in the event where the landing frequently occurs from the outer side of the heel, When landing sequentially from the heel portion to the toe portion of the shoe, the load load path (load path) and the wave-like traveling path of the corrugated sheet 4 can be substantially matched. That is, at the time of landing, the midsole 3 is deformed along the corrugated ridge line or valley line of the corrugated sheet 4.

As a result, not only the lateral runout and excessive pronation in the heel portion can be reliably prevented, but also a large ground contact area can be secured at the time of landing, whereby the grip performance can be improved and the wear resistance of the shoe sole can be improved. it can.

When this midsole structure is applied to a general running shoe, for example, A _i = 6 (mm), A _o = 3.25 (mm) λ _i = 40 (mm), λ _o = 25 (mm) is set.

< Fourth Embodiment > FIG. 17 is a view for explaining a midsole structure according to a fourth embodiment of the present invention. In the fourth embodiment, there is a relationship of A _i > A _o , as in the second embodiment. Further, contrary to the third embodiment, λ _o / 2> λ _i / 2, that is, λ _o > There is a relationship of λ _i .

In this case, the wave-shaped wavelength of the corrugated sheet 4 is set to be large on the outer side of the heel portion and smaller on the inner side, so that in the competition events in which landing frequently from the inside of the heel, When landing sequentially from the heel portion to the toe portion of the shoe, the load load path (load path) and the wave-like traveling path of the corrugated sheet 4 can be substantially matched. As a result, not only the lateral runout and excessive pronation in the heel portion can be reliably prevented, but also a large ground contact area can be secured at the time of landing, whereby the grip performance can be improved and the wear resistance of the shoe sole can be improved.

< Fifth Embodiment > FIG. 18 is a view for explaining a midsole structure according to a fifth embodiment of the present invention. In the fifth embodiment, there is a relation of 2A _o > 2A _i, that is, A _o > A _i , contrary to the second embodiment.

As described above, by increasing the amplitude of the corrugated shape of the corrugated sheet 4 on the outer side of the heel portion and decreasing it on the inner side, the midsole 3 on the inner side of the heel having a small amplitude is obtained.
And the compression hardness of the midsole 3 is increased on the outer side of the heel where the amplitude is large. As a result, in sports where the landing frequently occurs from the inside of the heel, the impact at the time of landing can be effectively mitigated by the inside of the heel of the midsole to secure cushioning, and the foot falls down to the outside of the heel after landing. Can be supported by the outer portion of the heel of the midsole, thereby preventing lateral deformation of the heel after landing.

Further, when the heel of the foot is spun out after landing, the heel of the foot is prevented from unnecessarily sinking into the outer side of the midsole by the heel outer portion having a large compression hardness. Can be prevented.

< Sixth Embodiment > FIG. 19 is a view for explaining a midsole structure according to a sixth embodiment of the present invention. In the sixth embodiment, there is a relationship of A _o > A _i as in the fifth embodiment. Further, in the sixth embodiment, there is a relationship of λ _o / 2> λ _i / 2, that is, λ _o > λ _i .

In this case, since the amplitude of the corrugated shape of the corrugated sheet 4 is large on the outer side of the heel portion and smaller on the inner side, the same as in the fifth embodiment,
Cushioning can be ensured in sports events where landing frequently from the inside of the heel, and lateral deformation of the heel after landing can be prevented.

Further, in this case, since the wavelength of the corrugated shape of the corrugated sheet 4 is made larger on the outer side of the heel portion and smaller on the inner side, the competition event which frequently hits from the inside of the heel portion is performed. In the above, when the shoe lands sequentially from the heel portion to the toe portion, the load-carrying path (load path) and the corrugated traveling path of the corrugated sheet 4 can be substantially matched. That is, at the time of landing, the midsole 3 is deformed along the corrugated ridge line or valley line of the corrugated sheet 4.

As a result, not only the lateral runout and excessive overturning at the heel portion can be reliably prevented, but also a large ground contact area can be secured at the time of landing, whereby the grip performance can be improved and the abrasion resistance of the shoe sole can be improved. it can.

< Seventh Embodiment > FIG. 20 is a view for explaining a midsole structure according to a seventh embodiment of the present invention. In the seventh embodiment, there is a relationship of A _o > A _i as in the fifth embodiment, and further, contrary to the sixth embodiment, λ _i / 2> λ _o / 2, that is, λ _i > There is a relationship of λ _o .

In this case, since the wavelength of the corrugated shape of the corrugated sheet 4 is made larger on the inner side of the heel portion and smaller on the outer side thereof, in the event where the landing frequency from the outer side of the heel is high, When landing sequentially from the heel portion to the toe portion of the shoe, the load load path (load path) and the wave-like traveling path of the corrugated sheet 4 can be substantially matched. As a result, not only the lateral runout and excessive overturning at the heel portion can be reliably prevented, but also a large ground contact area can be secured at the time of landing, whereby the grip performance can be improved and the abrasion resistance of the shoe sole can be improved.

< Eighth Embodiment > FIGS. 21 to 23 are views for explaining a midsole structure according to an eighth embodiment of the present invention. As shown in these figures, the amplitude of the corrugated shape of the corrugated sheet 4 gradually decreases from the inside and outside of the heel toward the center of the heel. That is, when the amplitude in the heel portion of the corrugated sheet 4 inside and outside the heel portion is A, and the amplitude in the central portion of the heel portion is A ', there is a relationship of 2A>2A', that is, A> A '.

As described above, the amplitude of the wavy shape of the corrugated sheet 4 is increased in the heel portion and on the outer side and reduced in the center portion of the heel portion. Is maintained, and the compression hardness of the midsole 3 is increased inside and outside of the heel portion having a large amplitude. As a result, the cushioning property at the time of landing on the heel can be ensured at the center of the heel, and deformation in the lateral direction of the heel at the time of landing can be prevented, and the stability can be improved.

[0183] Each wave shape on the inside and outside of the heel portion of the corrugated sheet 4 only needs to have at least the same wavelength, and may have different amplitudes. That is, when the amplitude of one waveform is A, the amplitude of the other waveform need not be A.

The corrugated ridge lines L and valley lines L '(FIG. 23) of the corrugated sheet 4 may intersect at the center of the heel portion. That is, the amplitude A 'may be zero.

Ninth Embodiment FIGS. 24 to 26 are views for explaining a midsole structure according to a ninth embodiment of the present invention. This ninth
In the embodiment, the phase of the waveform of the corrugated sheet 4 is shifted by １ ／ wavelength between the inside and the outside of the heel portion.

That is, with respect to the wave shape from the inside of the heel to the outside of the heel, the amplitude gradually decreases as the peak of the wave on the inside of the heel moves toward the outside of the heel.
The amplitude becomes zero at the center between the inside and the outside of the heel, and the amplitude gradually increases from the center to the outside of the heel toward the outside of the heel. .

Similarly, with regard to the wave shape from the outer heel side to the inner heel side, the amplitude gradually decreases as the peak of the wave on the outer heel side moves toward the inner heel side. The amplitude becomes zero at the central portion between the outer portions, and gradually increases from the central portion toward the inside of the heel toward the inside of the heel.

As described above, the amplitude of the wave-shaped wave in the central portion between the inside and the outside of the heel is zero. Thus, as in the eighth embodiment, the flexibility of the midsole is maintained at the central portion between the inside and the outside of the heel, and the compression of the midsole at the inside and outside of the heel having relatively large amplitude. Hardness increases. As a result, the cushioning property at the time of landing on the heel can be ensured at the center of the heel, and deformation in the lateral direction of the heel after landing can be prevented, and the stability can be improved.

The broken line L in FIG.
Represents a line connecting the wave-shaped peaks on the inside and outside surfaces of the heel portion and the wave-shaped valley portions on the outside and inside surfaces of the corresponding heel portion.

< Tenth Embodiment > In the tenth embodiment, the hardness of the corrugated sheet 4 is higher than the hardness of the midsole 3 in any of the first to ninth embodiments. Generally, when an impact load is repeatedly applied to the midsole 3 when the shoe lands, the corrugated sheet 4 is repeatedly deformed together with the midsole 3, and as a result, the midsole 3 gradually loses elasticity and easily becomes sagged. On the other hand, when the hardness of the corrugated sheet 4 is set to be high, the midsole 3 becomes difficult to settle due to the resilience of the corrugated sheet 4, so that the impact at the time of landing can be reduced even during long-term use, and the cushion can be cushioned. Nature can be secured.

< Eleventh Embodiment > In the eleventh embodiment, the corrugated sheet 4 according to any of the first to tenth embodiments is made of a fiber reinforced plastic (FRP) reinforced with glass fibers or the like. Is done. Thereby, the elasticity and durability of the corrugated sheet 4 are improved, and the corrugated sheet 4 can be used for a long time.

The fibers of the fiber reinforced plastic are preferably fibers which are aligned in one direction.

<Twelfth Embodiment > In the twelfth embodiment, since the fibers of the fiber-reinforced plastic are oriented in accordance with the direction of the corrugated ridge of the corrugated sheet 4, elasticity in a direction perpendicular to the ridge is obtained. Without excessively increasing the elasticity in the ridge direction.

The fibers of the fiber-reinforced plastic may be oriented within a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet 4.

< Thirteenth Embodiment > In the thirteenth embodiment, the fiber of the fiber-reinforced plastic is a woven structure such as a plain weave composed of a weft and a warp, and the elastic modulus of the weft is larger than the elastic modulus of the warp. Or equivalent.

It is preferable that the weft yarn of this weave is oriented in accordance with the direction of the corrugated ridge of the corrugated sheet.
Alternatively, the weft yarn may be oriented in a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet.

If the directions of the corrugated ridges of the corrugated sheet are not parallel as in the third and fourth embodiments, the direction of the aligned fibers and the direction of the weft yarn are changed. Orient to match the direction of the ridge passing almost through the center of the heel region, and ±
Orientation is performed within a range of 30 °.

< Fourteenth Embodiment > FIG. 27 is a perspective partial view of a corrugated sheet constituting a midsole structure according to a fourteenth embodiment of the present invention. In the figure, on the surface of the corrugated sheet 4, a plurality of convex ribs 6 extending in the direction of the wave-shaped ridge (the direction of the arrow) are provided.

By forming the corrugated sheet 4 in such a rib structure, the elasticity in the ridge direction can be selectively improved without excessively increasing the elasticity in the direction perpendicular to the ridge direction. .

< Fifteenth Embodiment > FIG. 28 shows an embodiment of a shoe sole to which the midsole structure according to the present invention is applied. (A) is a bottom view of the midsole structure, and (b) is a sectional view taken along line XX. The figure shows a portion of the corrugated sheet 4 other than the corrugated portion extended to the forefoot side. In the center region of the heel portion of the shoe sole, a window hole 20 penetrating the outsole 5 and the lower midsole 3b is formed. The window 20 is preferably elliptical.

FIG. 29 shows the maximum value of the pressure applied to the sole during running by contour lines. As shown in the figure, it can be seen that the largest pressure acts on the central region of the heel. Therefore, good cushioning properties are required in the central region of the heel.

As shown in FIG. 28, a window 2 is formed in the central region of the heel.
When 0 is provided, the compression hardness of the midsole structure in the central region is relatively reduced by the compression hardness carried by the lower midsole 3b.

Thus, sufficient cushioning properties can be obtained in the central region. Further, in this case, the corrugated sheet 4 has an appropriate elasticity, and supports the pressure received at the heel and disperses the pressure to the lower midsole 3b and the outsole 5, so that the heel unnecessarily sinks. There is no.

In particular, in the case of a sole having a structure in which the heel is independent or a sole having a non-slip structure such as a spike stud in the heel, the pressure at the time of contact with the heel is more concentrated than the flat sole. It is very effective to provide a window hole in the heel because it is easy to do.

[0205] In the case of elderly people, pain may occur due to compression of the calcaneal spines due to lean fat in the heel, and the window is also effective in relieving such pain.

[ Sports shoes 1 ′
Description ] Next, a preferred embodiment of the midsole structure in the sports shoe 1 '(FIG. 2) according to the second invention of the present invention will be described with reference to FIGS.

< First Embodiment > In FIG. 30, (a) is a plan view of the midsole structure on the left foot side, (b) is an outer side view thereof, and (c) is an inner side view thereof. FIG. 2 shows an example in which the amplitude A is doubled for convenience of illustration. Also, FIGS. 31, 33, 34,
FIG. 35 is a sectional view taken along line II, III-III, IV-IV, and VV of FIG. 30, respectively.
31 is a diagram showing a modification of FIG. In each of the drawings, the same reference numerals as those in each embodiment of the first invention denote the same or corresponding parts.

The embodiment according to the second invention is significantly different from the embodiments according to the first invention in FIG.
As shown in (1), the wavy portion of the corrugated sheet 4 is disposed not only on the heel portion in the midsole 3 but also on the forefoot portion.

With this configuration, when the shoe lands,
The portion from the heel portion to the forefoot portion of the midsole 3 is less likely to be laterally displaced and deformed in the left-right direction. As a result, the lateral deflection of not only the heel portion but also the forefoot portion is prevented.

On the other hand, in each embodiment according to the first aspect of the invention, the corrugated portion of the corrugated sheet 4 is disposed on the heel portion in the midsole 3 so that the landing event can be performed in a sporting event in which the heel portion lands frequently. It is trying to achieve both cushioning at the time and prevention of sideways swing.

However, each of the embodiments of the first invention is suitable for an event in which the frequency of landing on the heel portion of the shoe is high, such as running, for example, such as tennis, basketball, or volleyball. In particular, in the case of a sport where the lateral movement is severe and the forefoot portion of the shoe is frequently used, it is not always preferable.

In the second invention, as shown in FIG. 30, in order to support the player's lateral movement not only in the heel portion but also in the forefoot portion, as shown in FIG. That is, the corrugated portion of the corrugated sheet 4 was disposed on the forefoot portion.

Each corrugated portion of the corrugated sheet 4 is connected by a middle foot portion (an arch portion), and the connecting portion 4a is provided with a rib structure composed of a plurality of (here, three) concave portions 41. You may do so. These recesses 41 extend in the direction in which the connecting portions 4a are provided. Also, each recess 41
As shown in FIG. 31, a part of the connecting portion 4a is formed by, for example, forming an arc-shaped cross section.

With such a rib structure, a shank effect can be exhibited, whereby the rigidity of the middle foot can be improved with a simple structure, and the torsion of the middle foot can be prevented.

[0215] Instead of the concave portion 41, for example, a convex portion having an arc-shaped cross section may be formed, or the concave portion 41 and the convex portion may be used in combination. Further, instead of the concave portion 41, a convex rib 42 as shown in FIG. 32 may be provided.

As shown in FIG. 30A, the corrugated portion of the corrugated sheet 4 in the forefoot portion is disposed mainly on the outer portion of the forefoot portion. This is because when the midsole 3 in the forefoot portion is generally thin, and especially when the amplitude of the inner and outer portions is made different as in the first embodiment, the corrugated sheet 4 is disposed on the entire forefoot portion. Is difficult.

As for the amplitude of the wave shape of the corrugated sheet 4 in the forefoot portion, it is preferable that the amplitude on the outer side is larger than that on the inner side. In this embodiment, FIG. 33 and FIG.
As shown in FIG. 4, the amplitude gradually decreases from the outer side to the inner side, and the amplitude on the inner side becomes zero.

As described above, by increasing the amplitude on the outer side of the forefoot, the compression hardness on the outer side of the forefoot of the midsole 3 is increased. Thereby, when the load F directed to the outside of the forefoot is applied after the landing (see FIGS. 33 and 34), the forefoot of the foot is prevented from unnecessarily sinking to the outside of the midsole, As a result, the lateral movement of the forefoot portion is supported, and the competitor can easily move to the next step by utilizing the restoring force of the elastically deformed outer portion of the midsole.

In the corrugated forefoot portion of the corrugated sheet 4,
When the wavelengths on the outer side are λ _i and λ _o , respectively, it is preferable that λ _o > λ _i as shown in FIG.

In this case, after landing on the outer side of the forefoot, when the competitor takes the next step, the load load path (load path) and the corrugated traveling path of the corrugated sheet 4 are determined. Can be almost matched. As a result, not only can the lateral deflection of the forefoot part be reliably prevented, but also the flexibility in the stepping-out direction can be improved, and as a result, smooth squeezing can be realized while maintaining accurate gripping properties.

The direction (ridge direction) of the corrugated ridge line L of the corrugated sheet 4 in the forefoot portion is appropriately set at an angle so as not to hinder the flexibility of the forefoot portion.

Further, in the corrugated heel portion of the corrugated sheet 4,
When the amplitudes on the outer side are A _i and A _o , respectively, it is preferable that there is a relation of 2A _o > 2A _i, that is, A _o > A _i , as shown in FIGS.

In this embodiment, as shown in FIG. 35, the lower midsole 3b is taken along the line VV in FIG.
When the thickness on the outer side is t1 and the thickness on the inner side is t2, there is a relationship of t1> t2. That is, the amplitude of the corrugated sheet 4 gradually decreases as going from the outer side to the inner side.

As described above, by increasing the amplitude on the outer side of the heel portion, the compression hardness on the outer side of the heel portion of the midsole 3 is increased. Thereby, when the load F directed to the outer side of the heel part is applied after the landing (see FIG. 35), the heel of the foot is prevented from unnecessarily sinking to the outer side of the midsole. As a result, the athlete's lateral movement is more effectively supported in combination with the support in the forefoot, and the athlete is able to utilize the restoring force of the elastically deformed outer portion of the midsole. You can easily move to the next step.

The support at the outer portion of the midsole is conventionally made such that the height (thickness) of the outer portion of the midsole 3 is higher (thicker) than that of the inner portion, and the sole of the athlete touches the ground. This is also possible by making the surface on the side to be inclined an inclined surface that gradually descends from the outer side to the inner side.

In this case, however, the outer side of the foot is always lifted while the competitor is wearing the shoes (ie, even at rest), which may cause an obstacle to the foot. There is also a problem that the midsole is likely to be set when a load is repeatedly applied, which is not preferable in practical use.

On the other hand, in the present embodiment, the corrugated sheet 4 is actuated without changing the thickness of the midsole, that is, only when a high load acts, so that the load on the outer portion is effectively supported. I try to make it.

< Second Embodiment > In the second embodiment, the hardness of the corrugated sheet 4 is higher than the hardness of the midsole 3. This makes it possible to make the midsole 3 difficult to sag using the resilience of the corrugated sheet 4, and as a result, it is possible to maintain cushioning even after long-term use.

< Third Embodiment > In a third embodiment, in any one of the first and second embodiments, the corrugated sheet 4 is made of a fiber reinforced plastic (FRP) reinforced with glass fibers or the like. It is configured. Thereby, the elasticity and durability of the corrugated sheet 4 are improved, and the corrugated sheet 4 can be used for a long time.

[0230] The fibers of the fiber-reinforced plastic are preferably fibers which are aligned in one direction.

< Fourth Embodiment > In the fourth embodiment, since the fibers of the fiber-reinforced plastic are oriented in accordance with the direction of the corrugated ridge of the corrugated sheet 4, elasticity in the direction perpendicular to the ridge is obtained. Without excessively increasing the elasticity in the ridge direction.

The fibers of the fiber-reinforced plastic may be oriented within a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet 4.

< Fifth Embodiment > In the fifth embodiment, the fiber of the fiber reinforced plastic is a woven structure such as a plain weave composed of a weft and a warp, and the elastic modulus of the weft is larger than the elastic modulus of the warp. Or equivalent.

[0234] It is preferable that the weft yarns of this woven texture are oriented in accordance with the direction of the corrugated ridge of the corrugated sheet.
Alternatively, the weft yarn may be oriented in a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet.

When the directions of the ridges are not parallel to each other, such as the wavy shape of the forefoot portion of the corrugated sheet 4, the direction of the aligned fibers and the direction of the weft pass almost through the center of the forefoot region. Orientation may be performed so as to match the direction of the ridge, and may be oriented within a range of ± 30 ° with respect to the direction of the other ridges.

< Sixth Embodiment > According to a sixth embodiment, as in the twelfth embodiment of the first invention, the surface of the corrugated sheet 4 is provided with convex ribs extending in the direction of the corrugated ridge. Are provided.

By forming the corrugated sheet 4 in such a rib structure, the elasticity in the ridge direction can be selectively improved without excessively increasing the elasticity in the direction perpendicular to the ridge direction. .

< Seventh Embodiment > In the seventh embodiment, as shown in FIGS. 30 (a) and 34, the outsole 5 and the lower midsole 3b are provided in the central region of the heel of the lower midsole 3b. Is formed. The window 20 is preferably elliptical.

By providing such a window hole 20 in the central region of the heel, the compression hardness of the midsole structure in the central region is relatively reduced by the compression hardness of the lower midsole 3b. Thereby, sufficient cushioning properties can be obtained in the central region. Also,
In this case, the corrugated sheet 4 has an appropriate elasticity and supports the pressure received at the heel and disperses it to the lower midsole 3b and the outsole 5, so that the heel does not sink unnecessarily. .

[0240]

As described above in detail, according to the midsole structure of the sports shoe according to the first invention of the present invention, the corrugated sheet is interposed at least in the heel portion of the midsole, and the corrugated sheet is formed. At least one of the amplitude and the wavelength of the wave shape is made different between at least one of the front and rear ends of the heel portion or between the inner and outer portions. Alternatively, the amplitude of the wave shape of the corrugated sheet is large on the outer side of the heel portion and small at the center portion of the heel portion. Alternatively, the phase of the wave shape of the corrugated sheet is shifted by 波長 wavelength between the inside and the outside of the heel portion.

According to the midsole structure for sports shoes according to the second aspect of the present invention, the corrugated sheet is interposed in the heel portion and the forefoot portion in the midsole, and each corrugated sheet is placed in the midsole. They are connected by feet.

In this way, it is possible to prevent the athlete from swaying at the time of landing according to various competitions, thereby suppressing overrun and overrun, while ensuring cushioning and competitive ability at the time of landing. This has the effect of being able to achieve both the prevention of the reduction of

Further, according to the method for forming a midsole structure according to the present invention, the outer peripheral end surface of the first flat sheet is arranged inside the heel side wall surface of the shoe.
Insertion of the first flat sheet into the mold is facilitated,
There is an effect that molding can be easily performed. Further, since the outer peripheral end surface of the second flat sheet is arranged substantially flush with the heel side wall surface of the shoe, the outer peripheral end surface of the second flat sheet can be recognized from the outside after molding, Thereby, there is also an effect that the beauty of the product can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a sports shoe (for example, a running shoe) employing a midsole structure according to the first invention of the present invention.

FIG. 2 is a side view of a sports shoe (for example, tennis shoes or basket shoes) employing a midsole structure according to the second invention of the present invention.

FIG. 3 is an exploded partial view of the midsole structure.

FIG. 4 is a perspective partial view of a corrugated sheet constituting the midsole structure.

FIG. 5 is a yz sectional view of the corrugated sheet.

FIG. 6 is a diagram showing a relationship between a second moment of area I, a wavelength λ, and an amplitude A of the corrugated sheet.

FIG. 7 is a diagram showing a relationship between a bending rigidity EI of the corrugated sheet and a cushion coefficient C of a midsole incorporating the corrugated sheet.

FIG. 8 is a view for explaining a molding step of the midsole structure.

FIG. 9 is a view for explaining a molding step of the midsole structure.

FIG. 10 is a view for explaining a molding step of the midsole structure.

FIG. 11 is a diagram for explaining a molding step of the midsole structure.

FIG. 12 is a view for explaining a molding step of the midsole structure.

FIG. 13 is a view for explaining a molding step of the midsole structure.

FIGS. 14A and 14B are views for explaining a midsole structure according to the first embodiment of the first invention, wherein FIG. 14A is a plan view of a left foot side midsole structure, and FIG. (C) is an inside side view.

FIGS. 15A and 15B are views for explaining a midsole structure according to a second embodiment of the first invention, wherein FIG. 15A is a plan view of a left sole side midsole structure, and FIG. (C) is an inside side view.

FIGS. 16A and 16B are views for explaining a midsole structure according to a third embodiment of the first invention, wherein FIG. 16A is a plan view of a left foot side midsole structure, and FIG. (C) is an inside side view.

FIGS. 17A and 17B are views for explaining a midsole structure according to a fourth embodiment of the first invention, wherein FIG. 17A is a plan view of a left sole side midsole structure, and FIG. (C) is an inside side view.

FIGS. 18A and 18B are views for explaining a midsole structure according to a fifth embodiment of the first invention, wherein FIG. 18A is a plan view of the midsole structure on the left foot side, and FIG. (C) is an inside side view.

FIGS. 19A and 19B are views for explaining a midsole structure according to a sixth embodiment of the first invention, wherein FIG. 19A is a plan view of a left foot side midsole structure, and FIG. (C) is an inside side view.

FIGS. 20A and 20B are views for explaining a midsole structure according to a seventh embodiment of the first invention, wherein FIG. 20A is a plan view of a left foot side midsole structure, and FIG. (C) is an inside side view.

FIGS. 21A and 21B are views for explaining a midsole structure according to an eighth embodiment of the first invention, wherein FIG. 21A is a plan view of the midsole structure on the left foot side, and FIG. (C) is an inside side view.

FIG. 22 is an enlarged perspective view of a heel portion of the midsole structure (FIG. 21).

FIG. 23 is a view of the heel portion (FIG. 22) as seen from an arrow B.

FIGS. 24A and 24B are views for explaining a midsole structure according to a ninth embodiment of the first invention, wherein FIG. 24A is a plan view of a left foot side midsole structure, and FIG. (C) is an inside side view.

FIG. 25 is an enlarged perspective view of a heel portion of the midsole structure (FIG. 24).

FIG. 26 is a view of the heel portion (FIG. 25) as viewed from an arrow C.

FIG. 27 is a partial perspective view of a corrugated sheet constituting a midsole structure according to a fourteenth embodiment of the first invention.

28A and 28B are views for explaining a midsole structure according to a fifteenth embodiment of the first invention, wherein FIG. 28A is a bottom view of the left foot side midsole structure, and FIG. Line sectional view.

FIG. 29 is a diagram showing the maximum value of the pressure applied to the sole during running with contour lines in the fifteenth embodiment of the first invention.

FIGS. 30A and 30B are views for explaining a midsole structure according to a preferred embodiment of the second invention, wherein FIG. 30A is a plan view of the midsole structure on the left foot side, FIG. c) is an inside side view.

31 is a sectional view of the midsole structure (FIG. 30) taken along line II.

FIG. 32 is a view showing a modification of the midsole structure (FIG. 31).

FIG. 33 is a sectional view of the midsole structure (FIG. 30) taken along line III-III.

34 is a sectional view of the midsole structure (FIG. 30) taken along line IV-IV.

FIG. 35 is a sectional view taken along line VV of the midsole structure (FIG. 30).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Sports shoes 2 Upper part 3 Midsole 3a Upper midsole 3b Lower midsole 4 Corrugated sheet 4', 4 "Flat sheet 4a Connecting part 5 Outsole 20 Window hole A Amplitude λ Wavelength

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Hei 1-164804 (JP, U) Japanese Utility Model Sho 60-180506 (JP, U) Japanese Utility Model Sho 61-6804 (JP, Y2) (58) Field (Int. Cl. ⁷ , DB name) A43B 1/00-23/30

Claims (43)

(57) [Claims] 1. A midsole structure for a sports shoe, wherein a corrugated sheet is interposed at least in a heel portion in a midsole formed of a soft elastic member, and at least one of an amplitude and a wavelength of a corrugated shape of the corrugated sheet. One is different between the inside and outside of the heel
A midsole structure for sports shoes. 2. The waveform sheet according to claim 1, wherein at least one of the amplitude and the wavelength of the wave shape of the corrugated sheet.
Which is different between the front and rear ends of the heel
The midsole structure of sports shoes
Build. 3. The midsole structure of a sports shoe according to claim 1, wherein the amplitude of the corrugated shape of the corrugated sheet is small at a rear end side of the heel portion and is large at a front end side. Features a midsole structure for sports shoes. 4. The midsole structure of a sports shoe according to claim 1, wherein the corrugated sheet has a wave-shaped amplitude that is larger on an inner side of the heel portion and smaller on an outer side thereof. The midsole structure of sports shoes characterized by: 5. The midsole structure of a sports shoe according to claim 4 , wherein the wave-shaped wavelength of the corrugated sheet is larger on the inner side of the heel portion and smaller on the outer side. The midsole structure of sports shoes characterized by: 6. The midsole structure of a sports shoe according to claim 4 , wherein the wave-shaped wavelength of the corrugated sheet is larger on the outer side of the heel portion and smaller on the inner side. The midsole structure of sports shoes characterized by: 7. The midsole structure of a sports shoe according to claim 1, wherein the amplitude of the corrugated shape of the corrugated sheet is larger on the outer side of the heel portion and smaller on the inner side. The midsole structure of sports shoes characterized by: 8. The midsole structure of a sports shoe according to claim 7 , wherein the wave-shaped wavelength of the corrugated sheet is larger on the outer side of the heel portion and smaller on the inner side. The midsole structure of sports shoes characterized by: 9. The midsole structure of a sports shoe according to claim 7 , wherein the wave-shaped wavelength of the corrugated sheet is large on an inner side of the heel portion and smaller on an outer side thereof. The midsole structure of sports shoes characterized by: 10. A midsole structure for a sports shoe, wherein a corrugated sheet is interposed at least in a heel portion in a midsole formed of a soft elastic member, and the wavy amplitude of the corrugated sheet is smaller than that of the heel portion. A midsole structure for sports shoes, wherein the midsole structure is large on the inside and outside portions, and small at the center portion between the inside and outside portions of the heel portion. 11. A midsole structure for a sports shoe, wherein a corrugated sheet is interposed at least in a heel portion of a midsole formed of a soft elastic member, and a phase of a corrugated shape of the corrugated sheet is in the heel portion. A midsole structure for sports shoes, wherein the wavelength is shifted by a half wavelength between the outer sides. 12. A sports shoe midsole structure according to any one of claims 1 to 11, for sports hardness of the corrugated sheets are characterized said is higher than the hardness of the midsole, it Midsole structure for shoes. 13. The method of claim 1 to the sports shoe midsole structure according to any one of 12, the corrugated sheet is made of fiber-reinforced plastic, sports shoe midsole structure, characterized in that . 14. The midsole structure of a sports shoe according to claim 13 , wherein the fiber of the fiber reinforced plastic is a fiber aligned in one direction. Construction. 15. The midsole structure of a sports shoe according to claim 14 , wherein the fibers of the fiber-reinforced plastic are oriented in accordance with a direction of a corrugated ridge of the corrugated sheet. Midsole structure for sports shoes. 16. The sports shoe midsole structure according to claim 14 , wherein the fibers of the fiber-reinforced plastic are oriented within a range of ± 30 ° with respect to the direction of the corrugated ridge of the corrugated sheet. A midsole structure for sports shoes, characterized in that: 17. The midsole structure of a sports shoe according to claim 13 , wherein the fibers of the fiber-reinforced plastic have a woven structure composed of a weft and a warp, and the elastic modulus of the weft is the elasticity of the warp. A midsole structure for a sports shoe, wherein the midsole structure is greater than or equal to the rate. 18. The sports shoe according to claim 17 , wherein the weft yarn is oriented so as to coincide with a direction of a corrugated ridge of the corrugated sheet. Midsole structure. 19. The midsole structure of a sports shoe according to claim 17 , wherein the weft is oriented within a range of ± 30 ° with respect to a direction of a corrugated ridge of the corrugated sheet. Midsole structure for sports shoes. 20. A sports shoe midsole structure according to any one of claims 1 to 13, the surface of the corrugated sheet, the rib structure is provided, of a sports shoe, characterized in that Midsole structure. 21. The midsole structure of a sports shoe according to claim 20 , wherein the rib structure is composed of a plurality of ridges corresponding to a direction of a corrugated ridge of the corrugated sheet. The midsole structure of sports shoes characterized by: 22. The method of claim 1, 10 or sports shoe midsole structure according to any one of 11, the corrugated sheet is a thermoplastic or thermosetting of a resin and the heel outer circumferential end surface thereof shoes A first corrugated sheet disposed on the inner side of the side wall surface, and a soft elastic member having a smaller elastic modulus than the first corrugated sheet, and an outer peripheral end surface thereof is disposed substantially flush with a heel side wall surface of the shoe. And a second corrugated sheet. 2. A midsole structure for a sports shoe, comprising: 23. The sports shoe midsole structure according to any one of claims 1 to 22, wherein the window hole to the heel central portion of the midsole is formed, of a sports shoe, characterized in that Midsole structure. 24. A method of forming a midsole structure in which a corrugated sheet is interposed at least in a heel portion in a midsole of a sports shoe, comprising a thermoplastic or thermosetting resin, and an outer peripheral end surface of which is formed on a heel side of the shoe. A first flat sheet disposed on the inner side of the wall surface, and a soft elastic member having a smaller elastic modulus than the first flat sheet, and an outer peripheral end surface of the first flat sheet is substantially flush with a heel side wall surface of the shoe. Laminating a second flat sheet to be arranged, and placing the first and second flat sheets in a mold and thermoforming to form the first and second flat sheets. Forming a wavy sheet to obtain a corrugated sheet; and a method for forming a midsole structure of a sports shoe. 25. A midsole structure for a sports shoe, wherein a corrugated sheet is interposed in each of a heel portion and a forefoot portion in a midsole formed of a soft elastic member, and A midsole structure for sports shoes, which is connected at the foot. 26. The midsole structure of a sports shoe according to claim 25 , wherein the wavy amplitude of the corrugated sheet at the heel portion is small on the inner side of the heel portion and is larger on the outer side. A midsole structure for sports shoes. 27. A sports shoe midsole structure according to any one of claims 25 or 26, corrugated sheet portion in the forefoot portion is arranged only on the outer portion of the forefoot, and characterized in that Midsole structure for sports shoes. 28. The midsole structure of a sports shoe according to any one of claims 25 to 27, the waveform shape of the amplitude of the corrugated sheet in the forefoot, small inside portion of the forefoot and the outer portion The midsole structure of sports shoes, characterized in that it is larger on the side. 29. The midsole structure of a sports shoe according to any one of claims 25 to 28, the waveform shape of the wavelength of the corrugated sheet in the forefoot, small inside portion of the forefoot and the outer portion The midsole structure of sports shoes, characterized in that it is larger on the side. 30. In midsole structure of a sports shoe according to any one of claims 25 to 29, the connecting portion for connecting each of said corrugated sheet is a rib structure is provided which functions as a shank, it The midsole structure of sports shoes characterized by: 31. The midsole structure of a sports shoe according to claim 30 , wherein the rib structure includes a plurality of concave portions or convex portions extending in a direction in which the connecting portions are arranged. Midsole structure for sports shoes. 32. In midsole structure of a sports shoe according to any one of claims 25 to 31, for sports hardness of the corrugated sheets are characterized said is higher than the hardness of the midsole, it Midsole structure for shoes. 33. Claim 25 in to sports shoe midsole structure according to any one of 32, the corrugated sheet is made of fiber-reinforced plastic, sports shoe midsole structure, characterized in that . 34. The midsole structure of a sports shoe according to claim 33 , wherein the fibers of the fiber-reinforced plastic are fibers aligned in one direction. Construction. 35. The midsole structure of a sports shoe according to claim 34 , wherein the fibers of the fiber-reinforced plastic are oriented in accordance with a direction of a corrugated ridge of each of the corrugated sheets. Features a midsole structure for sports shoes. 36. The midsole structure of a sports shoe according to claim 34 , wherein the fibers of the fiber-reinforced plastic are oriented within a range of ± 30 ° with respect to a direction of a corrugated ridge of the corrugated sheet. A midsole structure for sports shoes. 37. The midsole structure of a sports shoe according to claim 33 , wherein the fiber of the fiber-reinforced plastic is a woven structure composed of a weft and a warp, and the elastic modulus of the weft is the elasticity of the warp. A midsole structure for a sports shoe, wherein the midsole structure is greater than or equal to the rate. 38. The midsole structure of a sports shoe according to claim 37 , wherein the weft yarn is oriented in accordance with a direction of a corrugated ridge of the corrugated sheet. Midsole structure. 39. The midsole structure of a sports shoe according to claim 37 , wherein the weft is oriented within a range of ± 30 ° with respect to a direction of a corrugated ridge of the corrugated sheet. Features a midsole structure for sports shoes. 40. In midsole structure of a sports shoe according to any one of claims 25 to 39, the surface of the corrugated sheet, the rib structure is provided, of a sports shoe, characterized in that Midsole structure. 41. The midsole structure of a sports shoe according to claim 40 , wherein the rib structure is constituted by a plurality of ridges corresponding to a direction of the ridge of the wavy shape. Midsole structure for sports shoes. 42. The midsole structure of a sports shoe according to claim 25 , wherein each of the corrugated sheets is made of a thermoplastic or thermosetting resin, and an outer peripheral end face is inside a side wall surface of the shoe. A midsole structure for a sports shoe, wherein 43. In sports shoe midsole structure according to any one of claims 25 to 42, wherein the window hole to the heel central portion of the midsole is formed, of a sports shoe, characterized in that Midsole structure.