DE102020108911A1 - MIDSOLE STRUCTURE FOR A SPORT SHOE - Google Patents

Abstract

The midsole structure (1) for a sports shoe comprises a midsole body (2) made of a foamed synthetic resin, and a sheet composite (3) extending from at least a pad (TE) of a foot portion to the toe portion in the midsole body (2) and a plurality of foam rubber layers (30, 31) which are overlapped and offset in a longitudinal direction comprises. The layered composite (3) comprises a single layer (30) on the toe section and multiple layers (30, 31) on the ball of the foot (TE) of the foot section.

Description

BACKGROUND OF THE INVENTION

The present invention relates generally to a midsole structure for a sports shoe, and more particularly to an improvement in the midsole structure for improving cushioning ability and contact at a foot of a shoe wearer and for enhancing propulsive force in sports.

The Japanese Patent Application Publication No. 2001-149101 discloses a sole structure for a boot. The sole comprises a rubber sole body, a core material disposed over the sole body and made of a foam rubber, and a shape retaining material made of rubber that is clamped between the sole body and the core material. The publication describes that the relatively thick core material, which is made of foam rubber, can demonstrate a favorable cushioning capacity and the rigidity can be improved by the shape-retaining material made of rubber (see paragraphs [0018] to [0022], 1 ).

In sports shoes, such. B. running shoes and the like, since a sole thickness of a toe is thin, it is difficult to insert the relatively thick core material (or the insole plate) made of foam rubber according to the prior art into a tip end of the toe. On the other hand, if the sole thickness of the toe is made thick so that the insole plate can be inserted into the tip end of the toe, the cushioning ability of the other sole areas may be reduced. Furthermore, there is a defect in the structure of the prior art that the weight of the entire sole becomes heavy because the rubber sole body is used.

The present invention has been made in view of these circumstances, and its object is to provide a midsole structure for a sports shoe which can improve cushioning ability and contact on a foot of a shoe wearer and which can enhance propulsive force in sports. Further, the present invention is directed to reducing the weight of such a midsole structure. Other objects and advantages of the present invention will become apparent and are set out below.

SUMMARY OF THE INVENTION

A midsole structure for a sports shoe according to one aspect of the present invention comprises a midsole body made of a foamed synthetic resin, and a composite sheet extending from at least a ball of a foot portion to a toe portion in the midsole body and a plurality of foamed rubber sheets overlapping and in are offset in a longitudinal direction includes. The composite sheet includes a single layer on the toe section and multiple layers on the ball of the foot section.

In accordance with the present invention, on the ball of the foot portion of the midsole body, a plurality of foam rubber plies of the sheet composite, e.g. H. a thick sheet layer made of foam rubber is arranged. Thus, the contact at a wearer's foot on the ball of the foot portion can be improved, and the cushioning ability on the ball of the foot portion can be enhanced.

On the toe portion of the midsole body is a single foam rubber layer of the sheet composite, i. H. a thin sheet made of foam rubber is arranged. Thereby, when a load is transmitted from the ball of the foot portion to the toe portion at the time of impact with the ground, a downward descent of the foot is gradually reduced. During a rolling movement of the foot on the toe section, a high repelling force can be achieved, and thus a propulsive force in sports can be increased. Furthermore, according to the present invention, since the metatarsal body is made of resin foam, the overall weight of the midsole structure can be reduced.

The midsole body may include a stepped concave portion which is open to a foot sole contact surface side and which has a different height in the longitudinal direction. The sheet composite can be received in such a concave portion. In this case, a plurality of layers of the layered composite are arranged in a deeper concave section and a single layer of the layered composite is arranged in a shallower concave section.

The midsole body may include a stepped concave portion which is open to a ground contact surface side and which has a different height in the longitudinal direction. The sheet composite can be received in such a concave portion. In this case, too, several layers of the layered composite are arranged in a deeper concave section and a single layer of the layered composite is arranged in a shallower concave section.

The midsole body may include a stepped concave portion penetrating in a thickness direction through the midsole body and which has a different height in the longitudinal direction. The sheet composite can be received in such a concave portion. In this case, too, several layers of the layered composite are arranged in a deeper concave section and a single layer of the layered composite is arranged in a shallower concave section.

The midsole body may include a stepped inner space that has a different height in the longitudinal direction. The layer composite can be accommodated in such an interior. In this case, too, several layers of the layered composite are arranged in a deeper concave section and a single layer of the layered composite is arranged in a shallower concave section.

The composite sheet may be disposed in a forefoot portion or a heel portion of the midsole body. Alternatively, the composite sheet may extend through a metatarsal portion to the forefoot portion of the midsole body. In any case, in an area in which the layered composite comprises multiple layers, contact at the wearer's foot and the cushioning ability can be improved by the thick layer made of foam rubber, while in an area in which the layered composite is a single Layer includes, a high repulsive force can be achieved and thus a propulsive force can be reinforced by the thin layer layer, which is made of foam rubber.

The sheet composite disposed in the heel portion of the midsole body may be separated from the sheet composite disposed in the forefoot portion of the midsole body in the longitudinal direction.

A midsole structure for a sports shoe according to another aspect of the present invention includes a midsole body made of foamed synthetic resin and a composite sheet extending at least from a ball of a foot portion to a toe portion in the midsole body and having a first layer and a second layer which are made of foam rubber and which are overlapped and offset in the longitudinal direction. Each of the first layer and the second layer have a front end located on a front end side thereof and a rear end located on a rear side thereof in the longitudinal direction. The front end of the first layer is positioned in front of the front end of the second layer in the toe portion of the midsole body.

According to the present invention, on the ball of the foot portion of the midsole body, the first and second foam rubber layers of the sheet composite, i.e. H. a thick sheet layer made of foam rubber is arranged. Thus, contact at a wearer's foot at the ball of the foot portion can be improved, and cushioning ability can be enhanced.

In the toe portion of the midsole body is the first foam rubber layer of the sheet composite, i. H. a thin sheet made of foam rubber is arranged. Thereby, when a load is transmitted from the ball of the foot portion to the toe portion at the time of impact with the ground, a downward descent of the foot is gradually reduced. During a rolling movement of the foot on the toe section, a high repelling force can be achieved, and thus a propulsive force in sports can be increased. Furthermore, according to the present invention, since the metatarsal body is made of resin foam, the overall weight of the midsole structure can be reduced.

The front end of the first layer can contact the midsole body from above. As a result, a greater repelling force can be achieved during a rolling movement of the foot on the toe section.

The rear end of the first layer can extend behind the rear end of the second layer. Thereby, when a load is transmitted from the rear end of the first layer through the rear end of the second layer to an overlapping portion of the first and second layers, cushioning ability and contact at the wearer's foot can be gradually improved.

The first ply may be disposed in a forefoot portion and a heel portion of the midsole body, and the second midsole may include a forefoot portion disposed in the forefoot portion of the midsole body and a heel portion disposed in the heel portion of the midsole body. The forefoot section and the heel section can be separated from one another in the longitudinal direction.

In this case, in an area where characters are overlapped with the first and second layers, contact at the wearer's foot and cushioning ability can be improved by a thick layer of sheet made of foam rubber, while in an area where in which only the first layer is arranged, a high repelling force can be achieved and a propulsive force can be reinforced by a thin layer made of foam rubber.

As explained above, according to the midsole structure of the present invention, since a plurality of foamed rubber layers of the sheet composite, i. H. a thick sheet layer made of foam rubber on which the ball of the foot portion of the midsole body is disposed, contact on the foot of a wearer can be improved, and cushioning ability can be enhanced on the ball of the foot portion. Furthermore, since a single foam rubber layer of the sheet composite, e.g. H. a thin sheet made of foam rubber is disposed in the toe portion of the midsole body, a large repelling force can be obtained during rolling of the foot in the toe portion, and thus propulsive force in sports can be increased. In addition, since the metatarsal body is made of resin foam, the overall weight of the midsole structure can be reduced.

Figure list

• 1 ist eine schematische Ansicht einer Draufsicht einer Mittelsohlenstruktur für einen Sportschuh gemäß einer ersten Ausführungsform der vorliegenden Erfindung.
• 2 ist eine Schnittansicht von 1 entlang der Linie II-II, die eine Längsschnittansicht entlang einer Längsmittellinie der Mittelsohlenstruktur von 1 darstellt.
• 3 ist eine Querschnittsansicht von 1 entlang der Linie III-III.
• 4 ist eine Querschnittsansicht von 1 entlang der Linie IV-IV.
• 5 ist eine schematische Ansicht einer Draufsicht einer Mittelsohlenstruktur für einen Sportschuh gemäß einer zweiten Ausführungsform der vorliegenden Erfindung.
• 6 ist eine Schnittansicht von 5 entlang der Linie VI-VI, die eine Längsschnittansicht entlang einer Längsmittellinie der Mittelsohlenstruktur von 5 darstellt.
• 7 ist eine Querschnittsansicht von 5 entlang der Linie VII-VII.
• 8 ist eine Querschnittsansicht von 5 entlang der Linie VIII-VIII.
• 9 ist eine schematische Ansicht einer Draufsicht einer Mittelsohlenstruktur für einen Sportschuh gemäß einer dritten Ausführungsform der vorliegenden Erfindung.
• 10 ist eine Schnittansicht von 9 entlang der Linie X-X, die eine Längsschnittansicht entlang einer Längsmittellinie der Mittelsohlenstruktur von 9 darstellt.
• 11 ist eine Querschnittsansicht von 9 entlang der Linie XI-XI.
• 12 ist eine Querschnittsansicht von 9 entlang der Linie XII-XII.
• 13 ist eine schematische Ansicht einer Draufsicht einer Mittelsohlenstruktur für einen Sportschuh gemäß einer vierten Ausführungsform der vorliegenden Erfindung.
• 14 ist eine Schnittansicht von 13 entlang der Linie XIV-XIV, die eine Längsschnittansicht entlang einer Längsmittellinie der Mittelsohlenstruktur von 13 darstellt.
• 15 ist eine Querschnittsansicht von 13 entlang der Linie XV-XV.
• 16 ist eine Querschnittsansicht von 13 entlang der Linie XVI-XVI.
• 17 ist eine schematische Ansicht einer Draufsicht einer Mittelsohlenstruktur für einen Sportschuh gemäß einer fünften Ausführungsform der vorliegenden Erfindung.
• 18 ist eine Schnittansicht von 17 entlang der Linie XVIII-XVIII, die eine Längsschnittansicht entlang einer Längsmittellinie der Mittelsohlenstruktur von 17 darstellt.
• 19 ist eine Querschnittsansicht von 17 entlang der Linie XIX-XIX.
• 20 ist eine Querschnittsansicht von 17 entlang der Linie XX-XX.
• 21 ist eine schematische Ansicht einer Draufsicht einer Mittelsohlenstruktur für einen Sportschuh gemäß einer sechsten Ausführungsform der vorliegenden Erfindung.
• 22 ist eine Schnittansicht von 21 entlang der Linie XXII-XXII, die eine Längsschnittansicht entlang einer Längsmittellinie der Mittelsohlenstruktur von 21 darstellt.
• 23 ist eine Querschnittsansicht von 21 entlang der Linie XXIII-XXIII.
• 24 ist eine Querschnittsansicht von 21 entlang der Linie XXIV-XXIV.
• 25 ist eine schematische Ansicht einer Draufsicht einer Mittelsohlenstruktur für einen Sportschuh gemäß einer siebten Ausführungsform der vorliegenden Erfindung.
• 26 ist eine Schnittansicht von 25 entlang der Linie XXVI-XXVI, die eine Längsschnittansicht entlang einer Längsmittellinie der Mittelsohlenstruktur von 25 darstellt.
• 27 ist eine Querschnittsansicht von 25 entlang der Linie XXVII-XXVII.
• 28 ist eine Querschnittsansicht von 25 entlang der Linie XXVII-XXVII.
• 29 ist eine schematische Ansicht einer Draufsicht einer Mittelsohlenstruktur für einen Sportschuh gemäß einer achten Ausführungsform der vorliegenden Erfindung.
• 30 ist eine Schnittansicht von 29 entlang der Linie XXX-XXX, die eine Längsschnittansicht entlang einer Längsmittellinie der Mittelsohlenstruktur von 29 darstellt.
• 31 ist eine Querschnittsansicht von 29 entlang der Linie XXXI-XXXI.
• 32 ist eine Querschnittsansicht von 29 entlang der Linie XXXII-XXXII.

For a better understanding of the invention, reference is made to the embodiments which are illustrated in more detail in the accompanying drawings and described below by way of examples for the invention.

• 1 Fig. 13 is a schematic plan view of a midsole structure for a sports shoe according to a first embodiment of the present invention.
• 2 FIG. 3 is a sectional view of FIG 1 along the line II-II, the one Longitudinal sectional view along a longitudinal centerline of the midsole structure of FIG 1 represents.
• 3 FIG. 3 is a cross-sectional view of FIG 1 along the line III-III.
• 4th FIG. 3 is a cross-sectional view of FIG 1 along the line IV-IV.
• 5 Fig. 13 is a schematic plan view of a midsole structure for a sports shoe according to a second embodiment of the present invention.
• 6th FIG. 3 is a sectional view of FIG 5 along line VI-VI showing a longitudinal sectional view along a longitudinal centerline of the midsole structure of FIG 5 represents.
• 7th FIG. 3 is a cross-sectional view of FIG 5 along the line VII-VII.
• 8th FIG. 3 is a cross-sectional view of FIG 5 along the line VIII-VIII.
• 9 Fig. 13 is a schematic plan view of a midsole structure for a sports shoe according to a third embodiment of the present invention.
• 10 FIG. 3 is a sectional view of FIG 9 along the line XX which is a longitudinal sectional view along a longitudinal center line of the midsole structure of FIG 9 represents.
• 11 FIG. 3 is a cross-sectional view of FIG 9 along the line XI-XI.
• 12 FIG. 3 is a cross-sectional view of FIG 9 along the line XII-XII.
• 13 Fig. 13 is a schematic plan view of a midsole structure for a sports shoe according to a fourth embodiment of the present invention.
• 14th FIG. 3 is a sectional view of FIG 13 along the line XIV-XIV showing a longitudinal sectional view along a longitudinal center line of the midsole structure of FIG 13 represents.
• 15th FIG. 3 is a cross-sectional view of FIG 13 along the line XV-XV.
• 16 FIG. 3 is a cross-sectional view of FIG 13 along the line XVI-XVI.
• 17th Fig. 13 is a schematic plan view of a midsole structure for a sports shoe according to a fifth embodiment of the present invention.
• 18th FIG. 3 is a sectional view of FIG 17th along the line XVIII-XVIII showing a longitudinal sectional view along a longitudinal center line of the midsole structure of FIG 17th represents.
• 19th FIG. 3 is a cross-sectional view of FIG 17th along the line XIX-XIX.
• 20th FIG. 3 is a cross-sectional view of FIG 17th along the line XX-XX.
• 21st Fig. 13 is a schematic plan view of a midsole structure for an athletic shoe according to a sixth embodiment of the present invention.
• 22nd FIG. 3 is a sectional view of FIG 21st along line XXII-XXII showing a longitudinal sectional view along a longitudinal centerline of the midsole structure of FIG 21st represents.
• 23 FIG. 3 is a cross-sectional view of FIG 21st along the line XXIII-XXIII.
• 24 FIG. 3 is a cross-sectional view of FIG 21st along the line XXIV-XXIV.
• 25th Fig. 13 is a schematic plan view of a midsole structure for a sports shoe according to a seventh embodiment of the present invention.
• 26th FIG. 3 is a sectional view of FIG 25th along line XXVI-XXVI showing a longitudinal sectional view along a longitudinal centerline of the midsole structure of FIG 25th represents.
• 27 FIG. 3 is a cross-sectional view of FIG 25th along the line XXVII-XXVII.
• 28 FIG. 3 is a cross-sectional view of FIG 25th along the line XXVII-XXVII.
• 29 Fig. 13 is a schematic plan view of a midsole structure for a sports shoe according to an eighth embodiment of the present invention.
• 30th FIG. 3 is a sectional view of FIG 29 along line XXX-XXX showing a longitudinal sectional view along a longitudinal centerline of the midsole structure of FIG 29 represents.
• 31 FIG. 3 is a cross-sectional view of FIG 29 along the line XXXI-XXXI.
• 32 FIG. 3 is a cross-sectional view of FIG 29 along the line XXXII-XXXII.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will now be described in more detail with reference to embodiments thereof which are illustrated in the accompanying drawings. Here, a running shoe is taken as an example of a sports shoe.

In the following explanation, “up (upper side / upper / r / s)” and “downward (lower side / lower / r / s)” denote an upward direction, a downward direction, or a vertical direction of the shoe, "to the front (front side / front / r / s)" and "to the rear (rear side / back / r / s)" denote a forward direction or a backward direction or longitudinal direction of the shoe, and “a widthwise or lateral direction” means a lateral direction of the shoe.

For example, in 1 13, a schematic view of a top view of the midsole structure of the shoe, “up” and “down”, “out of the side” and “into the side”, respectively, of FIG running "or" running downwards "in 1 , and “a direction of width” means “the left-to-right direction” in 1 .

Furthermore, in 2 , a longitudinal sectional view, and in 3 , 4th 13, Cross-sectional views, only the sheet composite constituting the midsole structure according to the present embodiment are shown in hatching, and hatching of a midsole body and an outsole is omitted for the purpose of illustration. In the drawings, reference characters H, M and F denote a heel region, a metatarsal region and a forefoot region, respectively, of the midsole structure, which are designed to correspond to a heel section, a metatarsal section or an arterial arch of the sole of the foot and a forefoot section of a foot of a shoe wearer, respectively.

<First embodiment>

1-4 show a midsole structure for a sports shoe according to a first embodiment of the present invention. As shown in 1 and 2 includes the midsole structure 1 a midsole body 2 extending from the heel region H through the metatarsal region M to the forefoot region H, and a sheet composite (see hatched portions) 3 extending from the heel region H through the metatarsal region M to the forefoot region H on one side of an upper surface (i.e., a Sole contact side surface) 20th of the midsole body 2 extends. On a lower surface (i.e. a ground contact side surface) 22nd of the midsole body 2 is an outsole 4th fixedly attached, which has a ground contact surface that touches the ground. As shown in 2-4 exhibits the midsole body 2 a raised section 21st extending from an outer peripheral edge portion of the upper surface 20th extends upwards. A lower portion of an upper side (not shown) of the shoe is fixed to the raised portion 21st to attach. The sports shoe is put together like this.

As shown in 1-4 has the upper face 20th of the midsole body 2 concave portions or concavities formed therein 2A , 2 B to accommodate the layer composite 3 on. The concave portion located on an upper side 2A is to upper surface 20th open towards, and the concave portion arranged on a lower side 2 B is to the upper surface 20th through the concave portion 2A open through. None of the concave sections 2A , 2 B is to the lower face 22nd of the midsole body 2 open.

A front end wall section 2A ₁ of the concave section 2A is in front of a front end wall section 2B ₁ of the concave portion 2 B positioned. A rear end wall section 2A ₂ of the concave portion 2A is behind a rear end wall section 2B ₂ of the concave portion 2 B positioned. A generally longitudinal length of the concave portion 2A is longer than that of the concave portion 2 B . This will be between the concave sections 2A and 2 B a stepped surface 2Ab ₁ in the forefoot area F and a stepped surface 2Ab ₂ formed in the heel region H. Furthermore, side wall portions of the concave portions have 2A , 2 B no graduated Areas on and are aligned with one another in the lateral direction (see 1-3 ), and thus the side wall portions face the concave portions 2A , 2 B straight surfaces in the vertical direction (see 3 , 4th ).

The layer composite 3 includes a top layer (or a first layer) 30th that is arranged on an upper side and a lower layer (or a second layer) 31 which is arranged on a lower side. The upper layer 30th is in the concave portion 2A added, and the lower layer 31 is in the concave portion 2 B recorded. A lower surface 31B the lower layer 31 is on a base wall surface 2B ₀ of the concave portion 2 B attached, a forward end 31a the lower layer 31 faces the front end wall portion 2B ₁ of the concave section 2 B , and a rear end 31b the lower layer 31 faces the rear end wall portion 2B ₂ of the concave portion 2 B . A lower surface 30B the upper layer 30th is on an upper surface 31A the lower layer 31 attached, a forward end 30a the upper layer 30th faces the front end wall portion 2A ₁ of the concave portion 2A , and a rear end 30b the upper layer 30th faces the rear end wall portion 2A ₂ of the concave portion 2A . An upper surface 30A the upper layer 30th forms a foot sole contact face that follows a contour of the wearer's foot.

The layer composite 3 has a two-layer structure in an area where the upper and lower layers 30th , 31 are overlapped on each other, and the sheet composite 3 has a single-layer structure with only the top layer 30th in areas in front of the lower tier 31 and behind the lower layer 31 , ie in areas of the stepped surfaces 2Ab ₁ and 2Ab ₂ , on. That means the front end 30a the upper layer 30th before the front end 31a the lower layer 31 is arranged and the rear end 30b the upper layer 30th behind the rear end 31b the lower layer 31 is arranged. In other words, it is the composite sheet 3 structured so that it is the top layer 30th and the lower layer 31 overlaps, with the front and rear ends 30a , 30b the upper layer 30th with respect to the front and rear ends 31a , 31b the lower layer 31 are offset.

As shown in 2-4 indicates the upper layer 30th a uniform thickness in the longitudinal direction as well as in the lateral direction. The lower layer 31 furthermore has a uniform thickness in the longitudinal direction as well as in the lateral direction. In this example the thickness corresponds to the top layer 30th the thickness of the lower layer 31 . The side walls of the top layer 30th are generally perpendicular to the top surface 30A and the lower surface 30B . The side walls of the lower layer 31 are also generally perpendicular to the top surface 31A and the lower surface 31B .

As shown in 2 increases the thickness of the two-ply structural portion of the ply composite 3 regarding the midsole structure 1 about half the thickness of the midsole structure 1 in the heel area H, more than half the thickness of the midsole structure 1 in a range from the metatarsal region M to the forefoot region F, and the degree of the occupied thickness gradually increases toward the toe of the foot. The thickness of a single layer portion of the sheet composite 3 regarding the midsole structure 1 however, takes a very small fraction of the thickness of the midsole structure 1 in the heel area H, and the degree of occupied thickness in the forefoot area F gradually increases toward the toe of the foot.

As in a bone structure of the foot according to the descriptions 1 shown, the front end extends 30a the upper layer 30th to a position of a proximal portion of an end link DP ₁ a first toe, and the front end 31a the lower layer 31 extends to a position of a proximal portion of a base member PP ₁ the first toe. Thus, a ball of the foot or ball of the foot is TE, which is a metatarsophalangeal joint MJ ₁ between the base member PP ₁ and a metatarsus MB _{1 of} the first toe and a bulged portion around the metatarsophalangeal joint MJ ₁ encompassed around, in a region of the two-layer structure consisting of the upper and lower layers 30th , 31 that are superimposed, composed, positioned.

The toe portion of the foot, which is a distal end portion of the base member PP ₁ the first toe and the proximal portion of the distal phalanx DP ₁ The first toe comprises is in an area of a single-layer structure that consists only of the top layer 30th composed, positioned. The layer composite 3 of the present embodiment extends from at least the ball of the foot portion TE to the toe. As shown in 2 becomes the thickness of the midsole body 2 in the forefoot area F towards the tip of the toe gradually thinner. A reference number 2e in 2 indicates the thinnest section of the midsole body 2 , that between a most forward end of the stepped face 2Ab ₁ of the midsole body 2 and the lower surface 22nd of the midsole body 2 is arranged.

The midsole body 2 is made of a foamed synthetic resin, in particular a foamed elastoplast, such as. B. foamed thermoplastic ethylene-vinyl acetate copolymer (EVA) and the like, or a foamed Thermoset, such as B. foamed polyurethane (PU) and the like. The layer composite 3 is formed from a foam rubber, in particular a foam body made of natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, nitrile-butadiene rubber or the like. The hardness of the midsole body 2 is set to 50 to 60C on the Asker C hardness scale, for example, and the hardness of the sheet composite 3 is set to, for example, 10 to 40C on the Asker C hardness scale. For the layer composite 3 a material with a low hardness and high repulsion is preferred. The outsole 4th is preferably made of a harder elastic material than the midsole body 2 , in particular an elastoplast, such as. B. ethylene-vinyl acetate copolymer (EVA) and the like, a thermoset, such as. B. polyurethane (PU) and the like, or a rubber material such. B. butadiene rubber, chloroprene rubber and the like formed. That had the outsole 5 is set to 50 to 90A on the Asker A hardness scale, for example.

An additional explanation will now be given of the rubber foam that makes up the sheet composite 3 forms, provided.
The rubber foam used in the present embodiment is formed from a foam rubber composition comprising a rubber composition and a foaming agent. The rubber foam is crosslinked foam in which the rubber composition is crosslinked and foamed.

The rubber composition is composed of natural rubber and / or synthetic rubber. As synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber can be used. One kind of these rubbers can be used alone, alternatively two or more kinds of these rubbers can be used together. Natural rubber and synthetic rubber can be used together. The proportion of the rubber composition with respect to the total rubber foam is preferably 40 to 90 mass%. This is because if less than 40 mass%, it becomes difficult to maintain repulsive elasticity, and if more than 90 mass%, processing sometimes becomes difficult due to the occurrence of a crack during formation.

Furthermore, when using natural rubber and / or isoprene rubber, the total proportion of the natural rubber and the isoprene rubber in terms of the overall rubber composition (i.e., the total mass of the rubber composition) is preferably 60 to 100 mass%. This is because, if it is less than 60 mass%, the repulsive elasticity cannot be maintained and the workability or workability is deteriorated. The rubber composition is preferably mixed with nitrile butadiene rubber. Since the nitrile group of the nitrile-butadiene rubber has polarity, the oil resistance of the rubber foam can be improved.

Foaming agents are not particularly limited, they only need to generate gas necessary for foaming the rubber composition by heating. Only one kind or two kinds or more can be used in combination. The proportion of the foaming agents in relation to the overall rubber composition is preferably 0.5 to 10% by mass, more preferably 2 to 5% by mass. This is because if less than 0.5 mass%, stable foaming is difficult, and if more than 10 mass%, there arises a problem that the diameter of surface or inner foam cells varies due to excessive foaming.

The rubber foam according to the present embodiment is also formed such that crosslinking agents, crosslinking aids, foaming additives, vulcanization accelerators, processing aids, reinforcing agents and the like are added to the above-mentioned rubber composite for crosslinking and foaming under a predetermined condition.

The crosslinking agents are not particularly limited, but sulfur which is common as a crosslinking agent for rubber and organic peroxide which promotes peroxide crosslinking are used. These can be used as only one kind, or two kinds or more in combination. The proportion of the crosslinking agents with respect to the overall rubber composition is preferably 1 to 7 mass%, more preferably 2 to 5 mass%. This is because if less than 1 mass%, the repulsive elasticity is sometimes decreased due to insufficient crosslinking, and if more than 7 mass%, foaming is sometimes insufficient due to excessive crosslinking.

The crosslinking aid is not particularly limited, but it can be used as one kind alone or two kinds or more in combination. The proportion of the crosslinking aid with respect to the overall rubber composition is preferably 1 to 10 mass%, more preferably 3 to 5 mass%. This is because if less than 1 mass%, the repulsive elasticity is decreased due to insufficient crosslinking, and if more than 10 mass% is decreased in weight, a product sometimes becomes hard due to a high specific gravity of the rubber composition.

Foaming additives are not particularly limited, but they can be Urea compound, zinc compound and the like can be used. These can be used as one kind alone or as two kinds or more in combination. The proportion of the foaming additives with respect to the overall rubber composition is preferably 0.5 to 10 mass. The foaming additives are normally present in the same amount as the foaming agents. When fewer foaming agents are added than foaming additives, some of the foaming agents generate formaldehyde or the like. A suitable setting is therefore required in accordance with the amount of foaming agent to be used.

The vulcanization accelerator is not particularly limited, but it can be used as one kind alone or two kinds or more in combination. The proportion of the vulcanization accelerator with respect to the overall rubber composition is preferably 0.2 to 3 mass%. This is because if less than 0.2 mass%, it takes a long time to mold and lowers productivity, and the repulsive elasticity decreases due to insufficient crosslinking, and if more than 3 mass%, the possibility of molding blooming increases.

With a view to improving the flowability and lubricity of the rubber composition, restriction on attachment to kneading machines such. B. rollers, and an improvement in the demolding effect, the proportion of the processing aid in relation to the total rubber foam which can contain the processing aid is preferably 0 to 2% by mass. The reason for this is that with more than 2% by mass, rollers can slip due to excessive lubricity in relation to materials and therefore materials are too hard to mix at the time of processing with rollers.

With a view to improving a mechanical property such. B. tensile strength, wear resistance and the like of vulcanized rubber, the rubber foam may contain reinforcing agents. The proportion of the reinforcing agents with respect to the overall rubber composition is preferably 5 to 50 mass%. This is because if less than 5 mass%, sufficient strength cannot be obtained, and if more than 50 mass%, the repulsive elasticity may be deteriorated and the specific gravity of the foam may become too high.

Next, a rubber foam manufacturing method will be briefly explained. First, materials such as B. a rubber composition as a base material, a crosslinking agent and a foaming agent are poured into the kneading machine. By kneading these materials, a foam rubber composition is made (kneading process). In this case, rubber compositions, crosslinking aids, reinforcing agents, crosslinking agents, vulcanization accelerators, foaming additives and foaming agents are poured and kneaded in this order into rolls heated to a predetermined temperature (for example, the surface temperature is 40-60 ° C). Then preforms, such as. B. rolling and pelletizing carried out.

Second, the foam rubber composition obtained in the kneading process is placed in a metal mold, and a heating process is performed to promote foaming by the foaming agents. Then, by performing a molding process and a peeling process, a foam rubber composition having a desired shape is obtained (foam molding process). In this case, the heating temperature in the heating process differs depending on the kinds of foaming agents and foaming aids, but the heating process is carried out at a decomposition temperature or higher (e.g. 120-180 ° C) of the foaming agents that are used.

The coefficient of repulsive or resilient elasticity or the impact strength coefficient of the rubber foam produced in the above-mentioned process is 72-84% according to the measurement method based on ASTM-D2632. In contrast, the impact resistance coefficient of an EVA foam having high impact resistance is 63% according to the same method. It has been found that the impact resistance coefficient of the rubber foam used in this embodiment is improved by 14-33% with respect to the EVA having a high impact resistance. For the special mixture, a foam sample (thickness: 10 ± 1mm) is prepared and a VERTICAL REBOUND RESILIENCE TESTER _GT-7042-V from GOTECH is used. At ambient temperature (23 ± 3 ° C) a metal plunger is dropped eight times every 5 seconds. During five times in the latter half, the indication (%) at the standstill point (i.e., the springback height) of the metal piston is read after each springback, and the average value thereof is taken as the springback elasticity coefficient.

With the midsole structure 1 structured as mentioned above is when a load is applied to the ball of the foot portion TE of the midsole body at the time of hitting the ground 2 is transferred during sport, the two-layer structured composite material 3 made up of the upper and lower layers 30th , 31 made of foam rubber, that is, a thick one Foam rubber sheet layer, assembled, disposed on the ball of the foot portion TE. At the same time, contact at the wearer's foot can be improved, and the cushioning ability can be enhanced at the ball of the foot portion TE.

Next, when a load is being transferred to the toe section, a single layer sheet composite is used 3 which is only made up of the upper layer 30th made of foam rubber, arranged on the toe portion. At this time, when the load moves from the ball of the foot portion TE to the toe portion on landing, a downward descent of the foot is gradually reduced, a high repelling force can be obtained at the time of a rolling movement of the toe portion, and a propulsive force can thus be increased in sports .

In particular, in the present embodiment, is the thin portion 2e of the midsole body 2 between the most forward end portion of the stepped surface 2Ab ₁ of the midsole body 2 and the lower surface 22nd of the midsole body 2 educated. Thus, when the foot can be on the toe portion on the stepped surface 2Ab ₁ unrolls, a higher repulsion force compared to the unwind force of the foot from the stepped surface 2Ab ₁ be achieved. This enables a higher propulsion force to be achieved. Furthermore, when the above-mentioned highly resilient rubber foam can be used as the sheet composite 3 , which is composed of foam rubber, is used, an even higher rebound force can be obtained and an even stronger propulsion force can be obtained. In addition, as the midsole body can 2 is formed from foam rubber, the overall weight of the midsole structure can be reduced.

Further, when the wearer hits the ground at the heel end during exercise and the load is transferred from the rear end of the heel to a center of the heel, the load moves from a single layer area to the double layer area of the sheet composite 3 . The contact on the foot and the cushioning ability are gradually or gradually improved.

<Second embodiment>

5-8 show a midsole structure for a sports shoe according to a second embodiment of the present invention. In the drawings, like reference numerals indicate elements identical or functionally similar to those in the first embodiment. In the first embodiment, an example was shown in which the concave portions 2A , 2 B in which the layer composite 3 is recorded on the top surface (i.e. the sole contact side surface) 20th of the midsole body 2 are trained. In this second embodiment, the concave portions are 2A , 2 B in which the layer composite 3 is received, on the lower surface (ie the ground-contacting side surface) two second midsole bodies 2 educated.

That is, the concave portion arranged below 2 B to the lower surface 22nd is open towards and the concave portion arranged above 2A to the lower surface 22nd in through the concave portion 2 B is open. None of the concave sections 2A , 2 B is to the upper surface 20th open.

Also, there are generally longitudinal lengths of the top layer 30th and the lower tier 31 who have favourited the layered composite 3 of this second embodiment, to the generally longitudinal lengths of the top layer 30th and the lower tier 31 who have favourited the layered composite 3 form the first embodiment, opposite. That is, the front end 30a the upper layer 30th behind the front end 31a the lower layer 31 is arranged and the rear end 30b the upper layer 30th before the rear end 31b the lower layer 31 is arranged.

In other words, it is the composite sheet 3 structured so that the top layer 30th and the lower layer 31 are overlapped, with the front and rear ends 30a , 30b the top layer with respect to the front and rear ends 31a , 31b the lower layer 31 are offset. Between the concave sections 2A and 2 B is a stepped surface 2Bb ₁ formed in the forefoot area F, and a stepped surface 2Bb ₂ is formed in the heel region H.

In this case too, the sheet composite is like the above-mentioned first embodiment 3 with a two-layer structure consisting of an upper and a lower layer 30th , 31 made of foam rubber, ie a thick layer of foam rubber, composed on the ball of the foot portion TE arranged. The cushioning capacity on the ball of the foot section TE be improved.

Furthermore, a single layer composite material is on the toe section 3 that consists of only the upper layer 30th made of foam rubber, that is, composed of a thin foam rubber sheet, is arranged. As a result, when the foot rolls on the toe section, a high repulsive force can be achieved, and thus a propulsive force in sports can be increased.

In addition is the thin section 2e of the midsole body 2 between the most forward end portion of the stepped surface 2Bb ₁ and the top surface 20th of the midsole body 2 educated. Thus, when the foot is on the stepped surface 2Bb ₁ unrolls, a higher repulsion force compared to the unwind force of the foot from the stepped surface 2Bb ₁ be achieved. This enables a higher propulsive force to be achieved. Furthermore, if the above-mentioned high resilience rubber foam can be used as the sheet composite 3 Forming foam rubber is used, an even higher resilience can be achieved and an even stronger propulsion force can be achieved. Furthermore, when the load is transmitted from the rear end of the heel to the central portion of the heel, the cushioning ability can be gradually improved in the heel region H. In addition, the midsole body 2 formed from foam rubber, thereby reducing the overall weight of the midsole structure.

<Third embodiment>

9-12 show a midsole structure for a sports shoe according to a third embodiment of the present invention. In the drawings, like reference numerals to those in the first and second embodiments indicate elements that are identical or functionally similar. In the first embodiment, an example was shown in which the concave portions 2A , 2 B in which the layer composite 3 is added to the upper surface 20th are open to and to the lower surface 22nd of the midsole body 2 are not open, and in the second embodiment, an example was shown in which the concave portions 2A , 2 B to the lower surface 22nd are open towards and towards the upper surface 20th of the midsole body 2 are not open.

In this third embodiment, the concave portions are 2A and 2 B to both the top and bottom surfaces 20th , 22nd of the midsole body 3 open. The lower layers also extend in this third embodiment 31 , 31 ' who have favourited the layered composite 2 not from the heel area H through the metatarsal area M to the forefoot area F. The lower layers 30th , 31 are separated from each other in the longitudinal direction.

The concave sections 2A , 2 B penetrate the midsole body 2 in the thickness direction (see 10 , 11 ). The lower layer 31 extends from a front end portion of the midfoot area M to the middle portion of the forefoot area S. The front end 31a ₁ the lower layer 31 also has front end wall portion 2B ₁ of the concave portion 2 B , and the rear end 31b ₁ the lower layer 31 also has rear end wall section 2B ₂ of the concave portion 2 B . The lower layer 31 ' is arranged in the heel region H. The front end 31a ₂ the lower layer 31 ' faces the front end wall portion 2B ₁ ' of the concave portion 2 B , and the rear end 31b ₂ the lower layer 30th faces the rear end wall portion 2B ₂ ' of the concave portion 2 B . The lower face 30B the upper layer 30th is with the upper face 31A the lower layer 31 and the top surface 31 'A the upper layer 31 ' in contact.

The front end 30a the upper layer 30th is before the front end 31a ₁ the lower layer 31 arranged, and the rear end 30b the upper layer 30th is behind the rear end 31b ₂ the lower layer 31 ' arranged. In an area extending from the front end portion of the heel area H to the front end portion of the metatarsal area M, the lower sheet is not provided and is only the upper sheet 30th intended. Between the concave sections 2A and 2 B is a stepped surface 2Ab ₁ formed in the forefoot area F is a stepped surface 2Ab ₂ is formed in the heel region H, and a stepped surface 2Ab ₃ is formed in the metatarsal region M.

In this case too, the sheet composite is like the above-mentioned first and second embodiments 3 with a two-layer structure consisting of an upper and a lower layer 30th , 31 made of foam rubber, that is, a thick foam rubber sheet, is arranged on the ball of the foot portion TE. In this way, the contact on the foot and the cushioning ability on the ball of the foot portion TE can be improved.

Furthermore, a single layer composite material is on the toe section 3 that consists of only the upper layer 30th made of foam rubber, that is, composed of a thin foam rubber sheet, is arranged. As a result, when the foot rolls on the toe section, a high repulsive force can be achieved, and thus a propulsive force in sports can be increased.

In addition is the thin section 2e of the midsole body 2 between the most forward end portion of the stepped surface 2Ab ₁ and the lower surface 22nd of the midsole body 2 educated. Thus, when the foot is on the stepped surface 2Ab ₁ unrolls, a higher repulsion force compared to the unwind force of the foot from the stepped surface 2Ab ₁ be achieved. This enables a higher propulsive force to be achieved. Furthermore, if the above-mentioned high resilience rubber foam can be used as the sheet composite 3 forming foam rubber is used, an even higher springback force can be achieved and an even stronger propulsive force can be achieved. Further, when the load is transmitted from the rear end of the heel to the central portion of the heel and also the load is transmitted from the metatarsal region M to the forefoot region F, the contact on the foot and the cushioning ability can be improved little by little or gradually . In addition, as the midsole body can 2 is formed from foam rubber, the overall weight of the midsole structure can be reduced.

<Fourth embodiment>

13-16 show a midsole structure for a sports shoe according to a fourth embodiment of the present invention. In the drawings, like reference numerals indicate elements identical or functionally similar to those in the first to third embodiments. In this fourth embodiment, an example is shown in which the concave portions 2A , 2 B in which the layer composite 3 is added, neither to the upper surface 20th nor to the lower surface 22nd of the midsole body 2 are open. In other words, in this case the top and bottom layers 30th , 31 who have favourited the layered composite 3 form, in one in the midsole body 2 trained interior are included.

As shown in 14-16 includes the midsole body 2 an upper midsole 2 ₁ , which is located on the upper side, and a lower midsole 2 ₂ which is located on the lower side. The upper layer 30th is in the concave portion 2A that is on the lower face 22 ₁ of the upper midsole body 2 ₁ is formed, added, and the lower layers 31 , 31 ' are in two concave sections 2 B that are on the upper surface 22 ₂ the lower midsole 2 ₂ are formed, added.

In this case too, the sheet composite is like the above-mentioned first to third embodiments 3 with a two-layer structure consisting of an upper and a lower layer 30th , 31 made of foam rubber, that is, composed of a thick foam rubber sheet layer, are disposed on the ball of the foot portion TE, so that the contact on the foot and the cushioning ability on the ball of the foot portion TE can be improved.

Furthermore, a single layer composite material is on the toe section 3 that consists of only the upper layer 30th made of foam rubber, that is, composed of a thin foam rubber sheet, is arranged. As a result, when the foot rolls on the toe section, a high repulsive force can be achieved, and thus a propulsive force in sports can be increased.

In addition is the thin section 2e of the midsole body 2 between the most forward end portion of the stepped surface 2Bb ₁ and the lower surface 22nd of the midsole body 2 educated. Thus, when the foot is on the stepped surface 2Bb ₁ unrolls, a higher repulsion force compared to the unwind force of the foot from the stepped surface 2Bb ₁ be achieved. This enables a higher propulsive force to be achieved. Furthermore, if the above-mentioned high resilience rubber foam can be used as the sheet composite 3 Forming foam rubber is used, an even higher resilience can be achieved and an even stronger propulsion force can be achieved. Further, when the load is transmitted from the rear end of the heel to the central portion of the heel and also the load is transmitted from the metatarsal area M to the forefoot area F, the cushioning ability can be gradually improved. In addition, as the midsole body can 2 is formed from foam rubber, the overall weight of the midsole structure can be reduced.

<Fifth embodiment>

Fig. 17-20 show a midsole structure for a sports shoe according to a fifth embodiment of the present invention. In these drawings, like reference numerals indicate elements identical or functionally similar to those in the first to fourth embodiments. In this fifth embodiment, the concave portions are 2A , 2 B in which the layer composite 3 is received, in a range from the front end portion of the metatarsal region M to the central portion of the forefoot region F of the midsole body 2 , ie mainly in the forefoot area F, arranged. The concave portion is not provided in the heel H area. Thus are the top layer 30th and the lower layer 31 who have favourited the layered composite 3 form, in the area from the front end portion of the metatarsal region M to the central portion of the forefoot region F of the midsole body 2 , ie mainly in the forefoot area F, arranged.

In this case too, the sheet composite is like the above-mentioned first to fourth embodiments 3 with a two-layer structure consisting of an upper and a lower layer 30th , 31 made of foam rubber, that is, a thick foam rubber sheet, is arranged on the ball of the foot portion TE. The contact on the foot and the Cushioning ability on the ball of the foot portion TE can be improved.

Furthermore, a single layer composite material is on the toe section 3 that consists of only the upper layer 30th made of foam rubber, that is, composed of a thin foam rubber sheet, is arranged. As a result, when the foot rolls on the toe section, a high repulsive force can be achieved, and thus a propulsive force in sports can be increased.

In addition is the thin section 2e of the midsole body 2 between the most forward end portion of the stepped surface 2Ab ₁ and the lower surface 22nd of the midsole body 2 educated. Thus, when the foot is on the stepped surface 2Ab ₁ unrolls, a higher repulsion force compared to the unwind force of the foot from the stepped surface 2Ab ₁ be achieved. This enables a higher propulsive force to be achieved. Furthermore, if the above-mentioned high resilience rubber foam can be used as the sheet composite 3 Forming foam rubber is used, an even higher resilience can be achieved and an even stronger propulsion force can be achieved. In addition, as the midsole body can 2 is formed from foam rubber, the overall weight of the midsole structure can be reduced.

<Sixth embodiment>

21-24 show a midsole structure for a sports shoe according to a sixth embodiment of the present invention. In these drawings, like reference numerals indicate elements identical or functionally similar to those in the first to fifth embodiments. In this sixth embodiment, the concave portions are 2A , 2 B in which the layer composite 3 is recorded, separated mainly in the forefoot area F and the heel area H. Here are the upper layers 30th mainly separated in the forefoot area F and the heel area H, and likewise the lower layers 31 separated mainly in the forefoot area F and the heel area H.

More precisely, it is the lower layer 31 arranged in the central portion of the heel region H and in the part on the rear side of the forefoot region F. In the heel area H is the rear end of the upper layer 30th behind the rear end of the lower layer 31 arranged, and the front end of the top layer 30th is in front of the front end of the lower layer 31 arranged. Likewise, in a region from the metatarsal region M to the forefoot region F, the rear end of the upper layer is 30th behind the rear end of the lower layer 31 arranged, and the front end of the top layer 30th is in front of the front end of the lower layer 31 arranged.

In this case as well, the sheet composite is like the above-mentioned first to sixth embodiments 3 with a two-layer structure consisting of an upper and a lower layer 30th , 31 which are made of foam rubber, that is, composed of a thick foam rubber layer, are arranged on the ball of the foot portion TE, so that the contact on the foot and the cushioning ability on the ball of the foot portion TE can be improved.

On the toe section is a single layer composite 3 that consists of only the upper layer 30th , which is made of foam rubber, ie a thin foam rubber layer, is arranged, so that a high repulsion force can be achieved during a rolling movement of the foot on the toe section and thus a propulsive force can be increased in sports.

In addition is the thin section 2e of the midsole body 2 between the most forward end portion of the stepped surface 2Ab ₁ and the lower surface 22nd of the midsole body 2 educated. Thus, when the foot is on the stepped surface 2Ab ₁ unrolls, a higher repulsion force compared to the unwind force of the foot from the stepped surface 2Ab ₁ be achieved. This enables a higher propulsive force to be achieved. Furthermore, if the above-mentioned high resilience rubber foam can be used as the sheet composite 3 Forming foam rubber is used, an even higher resilience can be achieved and an even stronger propulsion force can be achieved. Further, when the load is transferred from the rear end of the heel to the central portion of the heel in the heel area H and also the load is transferred from the metatarsal area M to the forefoot area F, the contact on the foot and the cushioning ability can be made gradually or be gradually improved. In addition, as the midsole body can 2 is formed from foam rubber, the overall weight of the midsole structure can be reduced.

<Seventh embodiment>

25-28 show a midsole structure for a sports shoe according to a seventh embodiment of the present invention. In these drawings, like reference numerals indicate elements identical or functionally similar to those in the first to sixth embodiments. In this seventh embodiment, similar to that in FIG 17-20 the fifth embodiment shown are the concave portions 2A , 2 B , in which the layer composite 3 is received, in a range from the front end portion of the metatarsal region M to the central portion of the forefoot region F of the midsole body 2 , ie mainly in the forefoot area F, arranged. Thus are the top layer 30th and the lower layer 31 who have favourited the layered composite 3 form, in the area from the front end portion of the metatarsal region M to the central portion of the forefoot region F of the midsole body 2 , ie mainly in the forefoot area F, arranged.

However, this seventh embodiment differs from the fifth embodiment in that the width of the concave portion 2 B of the seventh embodiment is smaller than the width of the concave portion 2 B of the fifth embodiment (see 25th , 27 and 17th , 19th ). On the medial side of the midsole body 2 is the area 31c on the medial side of the concave section 2 B vertically on the surface 30c on the medial side of the concave section 2A aligned (see 27 ), but on the lateral side of the midsole body 2 is the area 31c on the lateral side of the concave portion 2 B not vertically on the surface 30c on the lateral side of the concave portion 2A aligned and arranged laterally inwards from this (see 27 ).

In this case as well, the sheet composite is like the above-mentioned first to sixth embodiments 3 with a two-layer structure consisting of an upper and a lower layer 30th , 31 which are made of foam rubber, that is, composed of a thick foam rubber layer, are arranged on the ball of the foot portion TE, so that the contact on the foot and the cushioning ability on the ball of the foot portion TE can be improved.

On the toe section is a single layer composite 3 that consists of only the upper layer 30th made of foam rubber, that is, composed of a thin foam rubber layer, so that a high repelling force can be achieved when the foot rolls on the toe portion and thus a propulsive force in sports can be increased.

In addition is the thin section 2e of the midsole body 2 between the most forward end portion of the stepped surface 2Ab ₁ and the lower surface 22nd of the midsole body 2 educated. Thus, when the foot is on the stepped surface 2Ab ₁ unrolls, a higher repulsion force compared to the unwind force of the foot from the stepped surface 2Ab ₁ be achieved. This enables a higher propulsive force to be achieved. Furthermore, if the above-mentioned high resilience rubber foam can be used as the sheet composite 3 Forming foam rubber is used, an even higher resilience can be achieved and an even stronger propulsion force can be achieved. Furthermore, in this embodiment, from the lateral side to the medial side of the forefoot region F, the contact with the foot and the cushioning ability can be gradually or gradually improved. In contrast to this, on the lateral side of the forefoot area F, a higher repulsive force can be achieved, as a result of which supination during walking is hindered. In addition, as the midsole body can 2 is formed from foam rubber, the overall weight of the midsole structure can be reduced.

<Seventh embodiment>

In each of the above-mentioned first to seventh embodiments, an example was shown in which the midsole structure of the present invention was applied to a running shoe, but the scope of the present invention is not limited to such an example. The present invention can also be applied to various sports shoes such. B. hiking shoes, tennis shoes, indoor shoes and the like, are used. The present invention is also applicable to studded or spiked shoes, such as. B. football shoes, basketball shoes and the like, applicable.

29-32 show a midsole structure for a sports shoe according to an eighth embodiment of the present invention. In these drawings, like reference numerals indicate elements identical or functionally similar to those in the first to seventh embodiments. In this eighth embodiment, an example is shown in which the midsole structure 2 of the first embodiment is applied to a shoe with studs. Thus, the midsole structure is similar 2 the eighth embodiment functionally of the midsole structure 2 of the first embodiment, and thus the eighth embodiment has effects similar to those of the first embodiment, except that a plurality of studs are provided on the lower surface of the outsole 4th are provided. In this eighth embodiment, the layer composite can also be used 3 with a thick two-layer structure made of foam rubber, an upward thrust from the cleats 40 be degraded, there is a beneficial contact on the foot and the cushioning ability is maintained on the ball of the foot portion TE. Furthermore, a propulsive force during sport can be achieved through the directly underneath the stepped area 2Ab ₁ provided studs are further improved.

<Variant>

In the above-mentioned first to eighth embodiments, an example was shown in which the sheet composite 3 has a two-layer structure that comprises the top layer 30th and the lower layer 31 includes, but the scope of the present invention is not limited to such an example. The layer composite 3 may have a multilayer structure comprising three or more layers.

As mentioned above, the present invention is useful for a midsole structure for a sports shoe which can improve cushioning ability and contact on the foot and which can increase propulsive force in sports.

While the invention has been described with reference to particular embodiments and examples, modifications in structure, order, materials, and the like that would be apparent to those skilled in the art are within the scope of the invention.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• JP 2001149101 [0002]

Claims (13)

A midsole structure (1) for a sports shoe, comprising: a midsole body (2) made of a foamed synthetic resin; and a layer composite (3) which extends at least from a ball (TE) of a foot section to a toe section in the midsole body (2) and comprises a plurality of foam rubber layers (30, 31) which are overlapped and offset in a longitudinal direction, wherein the layer composite (3) comprises a single layer (30) on the toe portion and multiple layers (30, 31) on the ball of the foot (TE) of the foot portion. Midsole structure (1) according to Claim 1 , wherein the midsole body (2) comprises a stepped concave portion (2A, 2B) which is open to one side of the foot sole contact surfaces (20) and which has a different height in the longitudinal direction, and wherein the sheet composite (3) in the concave Section (2A, 2B) is added. Midsole structure (1) according to Claim 1 , wherein the midsole body (2) comprises a stepped concave portion (2A, 2B) which is open to one side of the ground contact surfaces (22) and which has a different height in the longitudinal direction, and wherein the composite sheet (3) in the concave Section (2A, 2B) is added. Midsole structure (1) according to Claim 1 wherein the midsole body (2) comprises a stepped concave portion (2A, 2B) which passes through the midsole body (2) in a thickness direction and which has a different height in the longitudinal direction, and the sheet composite (3) in the concave portion (2A, 2B) is included. Midsole structure (1) according to Claim 1 wherein the midsole body (2) comprises a stepped inner space (2A, 2B) which has a different height in the longitudinal direction, and the layer composite (3) is received in the inner space (2A, 2B). Midsole structure (1) according to Claim 1 , wherein the layer composite (3) is arranged in a forefoot portion (F) of the midsole body (2). Midsole structure (1) according to Claim 6 wherein the layer composite (3) is arranged in a heel portion (H) of the midsole body (2). Midsole structure (1) according to Claim 1 wherein the layer composite (3) extends from a heel section (H) through a metatarsal section (M) to a forefoot section (F) of the midsole body (2). Midsole structure (1) according to Claim 7 wherein the layered composite (3) arranged in the heel portion (H) of the midsole body (2) is separated from the layered composite (3) arranged in the forefoot portion (F) of the midsole body (2) in the longitudinal direction . A midsole structure (1) for a sports shoe, comprising: a midsole body (2) made of foamed synthetic resin; and a sheet composite (3) which extends at least from a ball (TE) of a foot portion to a toe portion in the midsole body (2) and comprises a first layer (30) and a second layer (31) which are made of foam rubber and which are overlapped and offset in the longitudinal direction, each of the first layer (30) and the second layer (31) having a front end (30a, 31a) located on a front end side thereof and a rear end located on a rear side thereof in the lengthwise direction (30b, 31b) have, wherein the front end (30a) of the first layer (30) is positioned in front of the front end (31a) of the second layer (31) in the toe portion of the midsole body (2). Midsole structure (1) according to Claim 10 wherein the front end (30a) of the first layer (30) touches the midsole body (2) from above. Midsole structure (1) according to Claim 10 wherein the rear end (30b) of the first layer (30) extends behind the rear end (31b) of the second layer (31). Midsole structure (1) according to Claim 10 , wherein the first layer (30) is arranged in a forefoot section (F) and a heel section (H) of the midsole body (2) and the second layer (31) is a forefoot layer section which is arranged in the forefoot section (F) of the midsole body (2) and a heel layer portion disposed in the heel portion (H) of the midsole body (2), the forefoot layer portion and the heel layer portion being separated from each other in the longitudinal direction.

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