JP4031482B2 - Sole structure for shoes - Google Patents

Description

  The present invention relates to a sole structure for shoes, and more particularly, to an improvement in structure for improving landing feeling.

  As a sole structure for shoes, a sole structure as shown in JP-A-11-203 has been proposed. The sole structure is provided at least on the heel portion of the shoe, and includes an upper midsole and a lower midsole made of a soft elastic member, and a corrugated sheet interposed therebetween and bonded to the midsole. It is configured.

  In this case, the upper and lower midsole made of a soft elastic member can mitigate the impact at the time of landing on the shoes and ensure cushioning at the time of landing (that is, shock mitigation), and is sandwiched between the upper and lower midsole. The corrugated sheet can prevent unnecessary sinking of the buttocks and ensure stability when landing.

However, in the conventional structure, it is necessary to provide a corrugated sheet separately from the upper and lower midsoles. Therefore, the number of parts is large and the structure is complicated. In addition, the weight of the entire shoe is increased by using the corrugated sheet.
JP 11-203 A

  The problem to be solved by the present invention is to realize a sole structure that can improve the landing feeling (landing feeling) experienced by a shoe wearer at the time of landing with a lightweight and simple structure.

  The most important feature of the present invention is that the first and second soft elastic members arranged above and below are bonded through an adhesive layer having a thickness of 100 μm or more, more preferably 200 μm or more.

  Here, the result of the drop settlement test performed on the foam is shown in FIG. The drop subsidence test is a test for measuring the amount of subsidence (subsidence) of a foam when a weight having a constant weight is dropped from a certain height and collided with the foam. The foam used in the experiment has a structure in which two layers of upper and lower foams are bonded via an adhesive layer. In FIG. 1, the foam has an adhesive layer whose tensile elastic modulus is 38 Mpa. Shows the results of experiments conducted with various thicknesses of the adhesive layer. The vertical axis in FIG. 1 is a comparison value (herein referred to as “sinking amount index”) when the foam subsidence amount is 100 when the foam does not have an adhesive layer, ie, the foam has a thickness of zero. ). In the experiment, the thickness of the entire foam structure including the adhesive layer was made the same as the thickness of the foam without the adhesive layer.

  On the other hand, it has been empirically found that if the sinking amount is reduced by at least 5%, the shoe wearer can actually experience an improvement in stability when landing. From this point of view, when FIG. 1 is viewed, the value of the foam subsidence index decreased by 5% from 100 is 95, and the thickness of the adhesive layer such that the subsidence index is 95 or less is 100 μm or more. I understand that.

1st invention of this application was devised based on such a viewpoint, Comprising: The sole structure for shoes which concerns on invention of Claim 1 of this application is arrange | positioned above the said sole structure , A first soft elastic member having a wave-shaped lower surface, and a second soft elastic member disposed below the first soft elastic member and having a wave-shaped upper surface corresponding to the wave shape of the lower surface of the first soft elastic member The elastic member is disposed between the lower surface of the first soft elastic member and the upper surface of the second soft elastic member , and is made of an adhesive having a tensile elastic modulus of 20 to 5000 Mpa . Corrugated sheet-like adhesive layers that adhere the corresponding corrugated surfaces to each other are provided, and the thickness of the adhesive layer is not less than 100 μm and not more than 1000 μm .

  According to the first aspect of the present invention, since the thickness of the adhesive layer is set to 100 μm or more, as described with reference to FIG. 1, the settlement amount index of the sole structure is determined from the first and second soft elastic members. It can be reduced by 5% or more compared to a structure having the same thickness and having no adhesive layer. Thereby, the stability at the time of landing which is one of the feelings of landing can be ensured. In addition, in this case, since a separate member such as a corrugated sheet is not required, the structure can be simplified and the weight can be reduced. The thickness of the adhesive layer is preferably 1000 μm (that is, 1 mm) or less from the viewpoint of weight reduction of the entire structure.

The tensile modulus of the adhesive is preferably 20 to 5000 MPa. Here, for the three types of foams having the adhesive layer thicknesses of 220 μm, 360 μm, and 530 μm, respectively, the results of performing the drop impact test by varying the tensile elastic modulus of the adhesive constituting the adhesive layer are shown in FIG. 3 shows. The drop impact test is a test for measuring an acceleration generated in a weight when a weight having a constant weight is dropped from a certain height and collided with a foam. The maximum impact value index on the vertical axis in FIG. 3 is represented by a comparative value when the weight acceleration in the case of a foam having no adhesive layer (that is, the thickness of the adhesive layer = 0) is 100.

As can be seen from FIG. 3, in any adhesive layer having any tensile modulus, when the tensile modulus of the adhesive layer is 20 Mpa or more, the maximum impact value index is drastically decreased, and the impact relaxation effect is dramatically increased. is doing.

In view of such experimental results, in the invention of claim 1, the tensile elastic modulus of the adhesive is set to 20 Mpa or more. Moreover, the reason why the upper limit of the tensile modulus of the adhesive is set to 5000 Mpa is that it is considered to be the upper limit of the available adhesive.

In this case, since the adhesive layer has a corrugated sheet shape, when the impact load is applied, in addition to the shear deformation of the first and second soft elastic members, the adhesive layer is similar to the corrugated sheet. Demonstrate the function. Thereby, the stability at the time of landing can be further improved.

Next, the results of a drop impact test performed on the foam are shown in FIG . Foam used in experiments has a bonded structure through the adhesive layer foam upper and lower layers, in FIG. 2, the tensile modulus of the adhesive is 38 MPa, 236Mpa, at 480Mpa respectively For each of the foams having three types of adhesive layers, the results of experiments with different thicknesses of the adhesive layers are shown. The vertical axis in FIG. 2 is a comparison value when the acceleration of the weight in the case of a foam having no adhesive layer, that is, the thickness of the adhesive layer being zero, is referred to as “maximum impact value index”. It is represented by In the experiment, the thickness of the entire foam structure including the adhesive layer was made the same as the thickness of the foam without the adhesive layer.

  On the other hand, it has been empirically found that if the maximum impact value is reduced by at least 10%, the shoe wearer can actually experience an improvement in impact relaxation. From this point of view, when FIG. 2 is viewed, the value of the maximum impact value index of the foam reduced by 10% from 100 is 90, and the adhesion is such that the maximum impact value index is 90 or less for all three types of adhesive layers. It can be seen that the thickness of the layer is 200 μm or more.

The second invention of the present application was devised based on such a point of focus, and the sole structure for shoes according to the invention of claim 2 of the present application was disposed on the upper side of the sole structure. The first soft elastic member, the second soft elastic member disposed below the first soft elastic member, and the first and second soft elastic members are disposed between the first soft elastic member and the first soft elastic member. And an adhesive layer made of an adhesive for adhering the elastic members to each other, and the adhesive layer has a thickness of 200 μm to 1000 μm .

  According to the invention of claim 2, since the thickness of the adhesive layer is set to 200 μm or more, the maximum impact value index of the sole structure is set to the first and second soft elastic members as described with reference to FIG. Compared with the structure of the same thickness which consists of and does not have an adhesion layer, it can reduce 10% or more. Thereby, the impact relaxation which is one of the landing feelings can be ensured. In addition, in this case, since a separate member such as a corrugated sheet is not required, the structure can be simplified and the weight can be reduced. The thickness of the adhesive layer is preferably 1000 μm (that is, 1 mm) or less from the viewpoint of weight reduction of the entire structure.

  By the way, the thickness of the adhesive layer used in the conventional structure is about 50 μm. The maximum impact value index of the structure in which the adhesive layer having a thickness of 50 μm is formed between the upper and lower midsole is 96 to 98 from FIG. 2, and is larger than the maximum impact value index 100 of the structure having the same thickness without the adhesive layer. Only 2-4%. Therefore, it can be seen that the influence of the adhesive layer on the impact relaxation effect is small in the conventional structure. On the other hand, when the thickness of the adhesive layer is set to 200 μm, the maximum impact value index rapidly decreases (see FIG. 2), and it can be seen that the impact relaxation effect is dramatically increased.

  As described in the invention of claim 3, the adhesive is preferably a urethane-based adhesive. This is mainly because a desired adhesive strength can be obtained in a relatively short time after bonding.

In the invention of claim 4 , the adhesive layer is formed on the entire mating surfaces of the first and second soft elastic members. In this case, the landing feeling can be improved over the entire mating surfaces of the first and second soft elastic members.

In the invention of claim 5 , the adhesive layer is formed on a part of the mating surfaces of the first and second soft elastic members. In this case, the landing feeling can be improved on a part of the mating surfaces of the first and second soft elastic members.

In the invention of claim 6 , the traveling direction of the waves forming the corrugated surface extends in both the front-rear direction and the width direction of the shoe.

When the wave traveling direction extends only in the front-rear direction of the shoe as in the conventional corrugated sheet, the corrugated mountain ridge line and valley line extend linearly in the shoe width direction. In the invention of item 6 , the ridge line and the valley line in such a wave shape further have a wave shape. In other words, in this case, the lower surface of the first soft elastic member, the upper surface of the second soft elastic member, and the adhesive layer all have a three-dimensional corrugated surface.

Since the conventional corrugated sheet is an injection-molded product of resin, the formation of such a three-dimensional corrugated surface is not particularly easy in terms of cost. In the invention of claim 6 , the first soft elastic member is used. Since an adhesive layer having a three-dimensional corrugated surface is formed by applying an adhesive to the lower surface and the upper surface of the second soft elastic member, it is easy to form a three-dimensional corrugated surface. In addition, by forming such a three-dimensional corrugated surface on the first and second soft elastic members and the adhesive layer, good landing stability can be obtained regardless of the impact load applied from any direction. Can be demonstrated effectively.

In the invention of claim 7, the adhesive layer includes a coating layer formed by applying a paint.

In this case, the coating layer enables finer control of landing stability and / or impact relaxation.

In the invention of claim 8 , the adhesive layer has an overhanging portion that projects above or below the side surface of the first or second soft elastic member. In this case, since each soft elastic member is supported from the side by the overhanging portion, lateral displacement of each soft elastic member can be prevented, and in particular, landing stability can be further improved. Moreover, the visibility with respect to the overhang | projection part which has a lateral shift prevention function can be improved by apply | coating a coating material to an overhang | projection part.

In the invention of claim 9 , the first and second soft elastic members are JIS K 7312 type and have a hardness of 30 to 75.

In the invention of claim 10 , the sole structure is a midsole structure, the first soft elastic member is an upper midsole, and the second soft elastic member is a lower midsole. In the invention of claim 11 , the upper midsole and the lower midsole are arranged in the heel part of the shoe, and in the invention of claim 12 , the upper midsole and the lower midsole are arranged in the forefoot part of the shoe. Yes.

In the invention of claim 13 , the sole structure is an insole structure (ie, an insole structure), the first soft elastic member is an upper insole, and the second soft elastic member is a lower insole.

In the invention of claim 14 , the sole structure is a cassette-type structure that is detachably attached to the shoe.

  ADVANTAGE OF THE INVENTION According to this invention, the sole structure which can improve the landing feeling which a shoe wearer senses at the time of landing can be implement | achieved by a lightweight and simple structure.

  Each example shown in FIGS. 4 to 15 below shows an example in which an adhesive layer is provided on the midsole of a shoe. That is, an example in which the sole structure according to the present invention is a midsole structure of a shoe is shown.

<First embodiment>
FIG. 4 is a bottom view of the midsole structure according to the first embodiment of the present invention and a partial side view of the outer side thereof. The midsole structure 1 includes an upper midsole 2a serving as a first soft elastic member disposed on the upper side, a lower midsole 2b serving as a second soft elastic member disposed below the upper midsole, and upper and lower midsoles. It is comprised from the contact bonding layer 3 which adhere | attaches sole 2a, 2b. In the drawing, the thickness of the adhesive layer 3 is drawn slightly exaggerated. Further, in the figure, a shaded area 30 represents an adhesive area.

  As shown in FIG. 4, corrugated surfaces corresponding to each other are formed on the lower surface of the upper midsole 2a and the upper surface of the lower midsole 2b, and these corrugated surfaces have a thickness of 200 μm or more (for example, a thickness of 220 μm). They are joined to each other via an adhesive layer.

  The upper and lower midsole 2a, 2b is, for example, a thermoplastic resin foam such as ethylene-vinyl acetate copolymer (EVA), a thermosetting resin foam such as polyurethane (PU), or a butadiene rubber or chloroprene rubber. It is comprised from the soft elastic member like the foam of rubber materials, such as. As the hardness of the upper and lower midsole 2a, 2b, a hardness of 30 to 75 in JIS K 7312 type is used.

  The adhesive constituting the adhesive layer 3 is preferably a urethane-based adhesive. This is mainly because a desired adhesive strength can be obtained in a relatively short time after bonding. Moreover, as a tensile elasticity modulus of an adhesive agent, 20-5000 Mpa is preferable.

  The adhesive layer 3 having a thickness of 200 μm or more is provided on the entire surface of the heel region among the mating surfaces of the upper and lower midsole 2a, 2b (see the shaded region 30), and is aligned at the midfoot portion of each midsole 2a, 2b. An adhesive layer having a thickness of about 50 μm is formed on the surface as in the conventional case.

  In this case, since the adhesive layer 3 having a thickness of 200 μm or more is formed between the upper and lower midsoles 2a and 2b in the heel portion of the shoe, when the drop impact test is performed as already described with reference to FIG. The maximum impact value index can be 90 or less. Thereby, the impact relaxation property which is one of the landing feelings in the heel part of shoes can be ensured. In addition, in this case, since a separate member such as a corrugated sheet is not required, the structure can be simplified and the weight can be reduced.

  Further, in this case, since the adhesive layer 3 having a thickness of 200 μm or more is formed, the subsidence amount index can be reduced to 95 or less when the drop subsidence test is performed as already described with reference to FIG. . Thereby, the landing stability which is one of the landing feelings in the heel part of shoes can be secured.

  If importance is attached only to the landing stability of the landing feeling, it can be said that it is sufficient that the thickness of the adhesive layer 3 is at least 100 μm as already described with reference to FIG. This also applies to each embodiment described below.

  Moreover, the tensile elastic modulus of the adhesive is set to 20 Mpa or more, as already described with reference to FIG. 3, in this case, the maximum impact value index is drastically reduced when the drop impact test is performed. This is because the impact relaxation effect can be dramatically increased. The reason why the upper limit of the tensile modulus of the adhesive is set to 5000 μm is that it is considered to be the upper limit of the available adhesive.

<Second embodiment>
FIG. 5 is a bottom view of a midsole structure according to a second embodiment of the present invention and a partial side view of its outer side. The difference between the second embodiment and the first embodiment is that, in the first embodiment, the bonding area according to the present invention is provided on the heel of the shoe, whereas the second embodiment is different from the first embodiment. Then, the adhesion area | region by this invention is the point provided in the forefoot part of shoes. That is, in the figure, the shaded area 31 represents the bonded area. Moreover, in the figure, the same code | symbol as FIG. 4 has shown the same or an equivalent part.

  In the second embodiment, an adhesive layer 3 having a thickness of 200 μm or more (for example, a thickness of 220 μm) is provided on the entire surface of the mating surfaces of the upper and lower midsoles 2a and 2b in the forefoot portion of the shoe (see the shaded region 31). ). The tensile elastic modulus of the adhesive constituting the adhesive layer 3 is preferably 20 to 5000 MPa as in the first embodiment.

  In this case, since the adhesive layer 3 having a thickness of 200 μm or more is formed between the upper and lower midsoles 2a and 2b in the forefoot portion of the shoe, the subsidence amount index can be made 95 or less when the drop subsidence test is performed. At the same time (see FIG. 1), the maximum impact value index can be made 90 or less when the drop impact test is performed (see FIG. 2). Thereby, the landing stability and impact relaxation property in the forefoot part of shoes can be ensured, and a landing feeling can be improved. In addition, in this case, since a separate member such as a corrugated sheet is not required, the structure can be simplified and the weight can be reduced.

<Third embodiment>
FIG. 6 is a bottom view and a rear end side view of a midsole structure according to a third embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts. The third embodiment is different from the first embodiment in that, in the first embodiment, the bonding area according to the present invention is provided on the entire surface of the heel of the shoe, whereas the third embodiment is different from the first embodiment. In an embodiment, the adhesive region according to the present invention is provided at the center of the heel of the shoe. That is, in the figure, the shaded area 30a represents the adhesion area.

  The third embodiment is different from the first embodiment in that a corrugated sheet 4 is interposed between the upper and lower midsoles 2a and 2b. The corrugated sheet 4 is a U-shaped member as viewed from the bottom and disposed along the outer periphery of the heel of the shoe, and has a wave shape that substantially proceeds in the front-rear direction of the shoe. An outer peripheral edge portion of the adhesive layer 3 having a thickness of 200 μm or more (for example, a thickness of 220 μm) is provided so as to overlap an inner peripheral side edge portion of the corrugated sheet 4. In addition, the thickness of the adhesive layer in other regions including the outer periphery of the heel portion of the shoe is about 50 μm as in the conventional case.

  In this case, the landing stability at the outer periphery of the heel of the shoe can be maintained by the corrugated sheet 4, and the landing stability and impact relaxation at the center of the heel can be ensured by the adhesive layer 3. In this case, since the corrugated sheet 4 does not need to be provided on the entire surface of the heel of the shoe, the weight of the entire shoe can be reduced.

<Fourth embodiment>
FIG. 7 is a bottom view of a midsole structure according to a fourth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts. In the fourth embodiment, an adhesive region having a thickness of 200 μm or more (for example, a thickness of 220 μm) according to the present invention is disposed along the outer periphery of the heel of the shoe. That is, in the figure, the shaded area 30b represents the adhesion area. In addition, an adhesive layer having a thickness of about 50 μm is formed at the center of the collar portion as in the conventional case.

  In this case, it is possible to maintain the landing stability and the impact relaxation property at the outer peripheral portion of the heel portion of the shoe by the adhesive layer, and by using no corrugated sheet, the structure can be simplified and the weight can be reduced.

<Fifth embodiment>
FIG. 8 is a bottom view of a midsole structure according to a fifth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts. In this fifth embodiment, an adhesive layer having a thickness of 200 μm or more (for example, thickness 220 μm) according to the present invention is disposed on the inner side of the heel of the shoe (see the shaded area 30c), and the outer of the heel On the side, a corrugated sheet 4 'is arranged. The central side edge of the adhesive layer and the central side edge of the corrugated sheet 4 'overlap.

  In this case, the landing stability and impact relaxation at the heel of the shoe can be ensured by the adhesive layer and the corrugated sheet 4 ′, and particularly in the case of court sports such as tennis and basketball with a lot of lateral movement. The corrugated sheet 4 'can effectively prevent lateral displacement of the heel when landing from the heel. In this case, the weight can be reduced by not using the corrugated sheet on the entire surface of the ridge.

<Sixth embodiment>
FIG. 9 is a bottom view of a midsole structure according to a sixth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts. In this sixth embodiment, an adhesive layer having a thickness of 200 μm or more (for example, thickness of 220 μm) according to the present invention is disposed on the outer side of the heel of the shoe (see the shaded area 30d), and the inner lining of the heel On the side, an adhesive layer having a thickness of about 50 μm is formed as in the prior art.

  In this case, the landing stability and impact relaxation at the heel of the shoe can be ensured by the adhesive layer, and landing from the heel especially in the case of court sports such as tennis and basketball with a lot of lateral movement. Sometimes the lateral displacement of the wrinkles can be effectively prevented by the adhesive layer. In this case, for example, without preparing a special member such as a corrugated sheet, the landing stability and impact mitigation properties can be easily achieved by simply changing the thickness of the adhesive layer between the inner and outer sides of the buttocks. Can be adjusted. Moreover, by not using a corrugated sheet, the structure can be simplified and the weight can be reduced.

<Seventh embodiment>
FIG. 10 is a bottom view of a midsole structure according to a seventh embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts. In the seventh embodiment, an adhesive layer having a thickness of 200 μm or more (for example, thickness of 220 μm) according to the present invention is disposed in an area from the rear end side to the outer side of the heel of the shoe (see the shaded area 30e). ), A corrugated sheet 4 ″ is disposed in a region from the inner side to the front end side of the buttocks. The edge of the adhesive layer and the edge of the corrugated sheet 4 ″ overlap each other.

  In this case, the landing stability and shock relaxation properties at the heel of the shoe can be ensured by the adhesive layer and the corrugated sheet 4 ″, and the weight of the shoe can be increased by landing in the region from the rear end side of the heel to the outer side. In the case of running-type sports that move to, the lateral displacement of the heel when landing from the heel can be effectively prevented by the corrugated sheet 4 ″. In this case, the weight can be reduced by not using the corrugated sheet on the entire surface of the ridge.

<Eighth embodiment>
FIG. 11 is a bottom view of a midsole structure according to an eighth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts. In the eighth embodiment, an adhesive layer having a thickness of 200 μm or more (for example, thickness of 220 μm) according to the present invention is disposed in a region from the inner back side to the front end side of the heel of the shoe (see the shaded region 30f). In the region from the rear end side of the buttocks to the outer side, an adhesive layer having a thickness of about 50 μm is formed as in the conventional case.

  In this case, especially in running sports where the weight moves forward by landing in the area from the rear end side to the outer side of the heel, the lateral displacement of the heel is effective in the adhesive layer when landing from the heel. Can be prevented. In this case, by not using the corrugated sheet, the structure can be simplified and the weight can be reduced.

<Ninth embodiment>
FIG. 12 is a bottom view of a midsole structure according to a ninth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts. In the ninth embodiment, an adhesive layer having a thickness of 200 μm or more (for example, 220 μm) according to the present invention is disposed in the outer side region of the forefoot portion of the shoe (see the shaded region 31a). In other regions, an adhesive layer having a thickness of about 50 μm is formed as in the conventional case.

  In this case, especially in the case of court sports such as tennis and basketball with a lot of lateral movement, the lateral displacement of the front foot can be effectively prevented by the adhesive layer when landing from the front foot. In this case, by not using the corrugated sheet, the structure can be simplified and the weight can be reduced.

<Tenth embodiment>
FIG. 13 is a bottom view of a midsole structure according to a tenth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts. In the tenth embodiment, the adhesive layer having a thickness of 200 μm or more (for example, thickness of 220 μm) according to the present invention is a region from the inner instep side to the center portion of the forefoot portion of the shoe (that is, the lower part of the Ryukyu part and the lower part of the Ryukyu part). (Refer to the shaded area 31b), and an adhesive layer having a thickness of about 50 μm is formed in the other areas of the forefoot portion as in the conventional case.

  In this case, especially in the case of running-type sports where the weight moves forward after landing in the area from the rear end side to the outer side of the heel and landing on the forefoot, when landing on the forefoot The lateral displacement of the forefoot can be effectively prevented by the adhesive layer. In this case, by not using the corrugated sheet, the structure can be simplified and the weight can be reduced.

<Other examples>
1) In each of the above-described embodiments, an example in which the adhesive layer 3 is formed from a single adhesive layer has been described. However, the application of the present invention is not limited to this. The adhesive layer 3 may be composed of a plurality of adhesive layers. The plurality of adhesive layers referred to here includes not only adhesive layers made of the same type of adhesive but also both adhesive layers made of different types of adhesive.

Here, the adhesive layer may include a coating layer formed by applying a paint. In this case, it is possible to perform finer control of the landing stability and / or the impact relaxation property by the coating film layers having different tensile elastic moduli.

2) In each of the above embodiments, either one of the upper and lower midsoles 2a and 2b is formed into an upper and lower two-layer structure, and an adhesive layer having a thickness of 100 μm or more or 200 μm or more is further formed on the mating surface of these two-layer structures. You may do it. That is, in this case, the midsole 2 has a three-layer structure as a whole, and two adhesive layers having a thickness of 100 μm or more or 200 μm or more are formed. Can be further improved.

3 ) In the first and second embodiments, the example in which the wave traveling direction forming the wave shape of the adhesive layer 3 extends only in the front-rear direction of the shoe is shown, but the application of the present invention is not limited to this. . As shown in FIG. 14, the traveling direction of the wave of the adhesive layer 3 may extend not only in the shoe front-rear direction Y but also in the shoe width direction X.

  When the wave traveling direction extends only in the front-rear direction of the shoe as in the conventional corrugated sheet, the corrugated mountain ridge line and valley line extend linearly in the shoe width direction. In the example shown in FIG. 14, the ridge line and the valley line of such a wave shape further have a wave shape. In other words, in this case, the lower surface of the upper midsole 2a, the upper surface of the lower midsole 2b, and the adhesive layer 3 all have a three-dimensional corrugated surface.

  Since the conventional corrugated sheet is a resin injection-molded product, it is not easy to form such a three-dimensional corrugated surface in terms of cost. In the example shown in FIG. Since the adhesive layer 3 having a three-dimensional corrugated surface is formed by applying an adhesive to the lower surface and / or the upper surface of the lower midsole 2b, the three-dimensional corrugated surface can be easily formed. . In addition, by forming such a three-dimensional corrugated surface on the upper and lower midsoles 2a and 2b and the adhesive layer 3, it is possible to achieve good landing stability regardless of the impact load acting from any direction. Can be demonstrated.

4 ) In each of the above embodiments, the case where the thickness of the adhesive layer 3 having a thickness of 100 μm or more or 200 μm or more according to the present invention is constant has been described as an example. However, the application of the present invention is not limited thereto. For example, in the first embodiment shown in FIG. 4, the peripheral portion of the bonding region 30 (that is, the heel peripheral portion) is made relatively thick (eg, thickness 400 μm), and the central portion of the bonding region 30 (that is, the heel central portion). ) May be relatively thin (eg, thickness 200 μm). Alternatively, either one of the outer side (that is, the outer side) or the inner side (that is, the inner side) of the bonding region 30 is made relatively thick (eg, 400 μm thick), and the rest The portion may be made relatively thin (eg, thickness 200 μm).

5 ) As shown in the cross-sectional view of FIG. 15, the adhesive layer 3 may have an overhang portion 3 a that projects above the side surface of the upper midsole 2 a. In this case, the upper midsole 2a is supported from the side by the overhanging portion 3a, so that the lateral displacement of the upper midsole 2a can be prevented, and the landing stability can be further improved. Note that the overhanging portion 3a may be provided so as to protrude below the side surface of the lower midsole 2b. In this case, the lower midsole 2b is supported from the side, and the lower midsole The lateral displacement of the sole 2b can be prevented, and landing stability can be further improved.

6 ) In each of the above embodiments, the present invention is applied to a midsole structure of a shoe. However, the sole structure according to the present invention can be similarly applied to an insole (insole) of a shoe. That is, in this case, the insole has a two-layer structure, and these layers may be bonded via an adhesive layer having a thickness of 100 μm or more or 200 μm or more.

7 ) The present invention can be similarly applied to a cassette-type structure that is detachably attached to a shoe. That is, in this case, a cassette-type structure is formed by adhering two upper and lower soft elastic members through an adhesive layer having a thickness of 100 μm or more or 200 μm or more and, for example, a recess is formed in the midsole of the midsole And you may make it accommodate a cassette type structure in this recessed part so that attachment or detachment is possible.

It is a graph which shows the relationship between the thickness of a contact bonding layer, and a subsidence amount index. It is a graph which shows the relationship between the thickness of a contact bonding layer, and a maximum impact value index | exponent. It is a graph which shows the relationship between the tensile elasticity modulus of an contact bonding layer, and a maximum impact value index | exponent. It is the bottom view and outer side side view of the mid sole structure of the shoes by the 1st example of the present invention, Comprising: The example in which the adhesion layer was provided in the heel part of shoes is shown. It is the bottom view and outer side side view of the mid sole structure of the shoes by the 2nd example of the present invention, and the example in which the adhesion layer was provided in the forefoot part of shoes is shown. FIG. 9 is a bottom view and a rear end side view of a midsole structure of a shoe according to a third embodiment of the present invention, wherein an adhesive layer is provided at the center of the heel of the shoe, and the corrugated sheet is an outer periphery of the heel of the shoe. An example provided in FIG. It is a bottom view of the mid sole structure of the shoes by the 4th example of the present invention, Comprising: The example in which the adhesion layer was provided in the heel part outer periphery of shoes is shown. FIG. 6 is a bottom view of a midsole structure of a shoe according to a fifth embodiment of the present invention, in which an adhesive layer is provided on the heel inner side of the shoe and a corrugated sheet is provided on the heel outer side of the shoe. An example is shown. It is a bottom view of the midsole structure of the shoes by the 6th example of the present invention, and the example in which the adhesion layer was provided in the buttocks outer shell side of shoes is shown. FIG. 10 is a bottom view of a midsole structure of a shoe according to a seventh embodiment of the present invention, in which an adhesive layer is provided from the rear end side of the buttocks to the outer side. It is a bottom view of the midsole structure of the shoes by the 8th example of the present invention, and the example where the adhesion layer was provided from the heel inner side to the front end side of shoes is shown. It is the bottom view of the mid sole structure of the shoes by the 9th example of the present invention, Comprising: The example in which the adhesion layer was provided in the forefoot outer shell side of shoes is shown. It is a bottom view of a midsole structure of a shoe according to a tenth embodiment of the present invention, and shows an example in which an adhesive layer is provided from the forefoot inner side to the center of the shoe. It is a perspective fragmentary view of the midsole structure of the shoes by the 11th example of the present invention, and the example in which the upper surface and adhesive layer of a lower midsole have a three-dimensional corrugated surface is shown. It is a cross-sectional view of a midsole structure of a shoe according to a twelfth embodiment of the present invention, and shows an example in which an adhesive layer projects above the side surface of the upper midsole.

Explanation of symbols

1: Midsole structure 2: Midsole 2a: Upper midsole 2b: Lower midsole 3: Adhesive layer 30, 31: Adhesive region

Claims (14)

A sole structure for shoes,
A first soft elastic member disposed on the upper side of the sole structure and having a wave-shaped lower surface ;
A second soft elastic member disposed below the first soft elastic member and having a corrugated upper surface corresponding to the corrugated shape of the lower surface of the first soft elastic member;
The first soft elastic member is disposed between the lower surface of the first soft elastic member and the upper surface of the second soft elastic member , and is made of an adhesive having a tensile elastic modulus of 20 to 5000 Mpa . Corrugated sheet-like adhesive layer that adheres the corresponding corrugated surfaces to each other,
The thickness of the adhesive layer is 100μm or more 1000μm or less,
A sole structure for a shoe characterized by that. In claim 1,
The adhesive layer has a thickness of 200 μm or more and 1000 μm or less ,
A sole structure for a shoe characterized by that. Oite to claim 1,
The adhesive is a urethane-based adhesive;
A sole structure for a shoe characterized by that. In claim 1 or 2,
The adhesive layer is formed on the entire mating surfaces of the first and second soft elastic members;
A sole structure for a shoe characterized by that. In claim 1 or 2,
The adhesive layer is formed on a part of the mating surfaces of the first and second soft elastic members,
A sole structure for a shoe characterized by that. In claim 1 ,
The traveling direction of the waves forming the corrugated surface extends in both the front-rear direction and the width direction of the shoe,
A sole structure for a shoe characterized by that. In claim 1 or 2,
The adhesive layer includes a coating layer formed by applying a paint,
A sole structure for a shoe characterized by that. In claim 1 or 2 ,
The adhesive layer has an overhanging portion that projects above or below the side surface of the first or second soft elastic member.
A sole structure for a shoe characterized by that. In claim 1,
The hardness of the first and second soft elastic members is 30 to 75 in JIS K 7312 type,
A sole structure for a shoe characterized by that. In claim 1,
The sole structure is a midsole structure, the first soft elastic member is an upper midsole, and the second soft elastic member is a lower midsole;
A sole structure for a shoe characterized by that. In claim 10 ,
The upper midsole and the lower midsole are arranged on the heel of the shoe,
A sole structure for a shoe characterized by that. In claim 10 ,
The upper midsole and the lower midsole are disposed on the forefoot portion of the shoe,
A sole structure for a shoe characterized by that. In claim 1,
The sole structure is an insole structure, the first soft elastic member is an upper insole, and the second soft elastic member is a lower insole;
A sole structure for shoes characterized by the above. In claim 1,
The sole structure is a cassette-type structure that is detachably attached to shoes.
A sole structure for a shoe characterized by that.

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