This application is a U.S. National Stage application, filed pursuant to 35 U.S.C. § 371, of international application no. PCT/EP2018/061934, filed on May 8, 2018, the contents of which is incorporated herein by reference in its entirety.
The invention relates to a sole of a shoe, particularly of an athletic shoe, wherein the sole has an extension in a longitudinal direction and an extension in a vertical direction perpendicular thereto, wherein a number of recesses is introduced into the sole, wherein the recesses extend in a transverse direction perpendicular to the longitudinal direction and perpendicular to the vertical direction and permeate the sole at least in part.
In the case of sports shoes, an attempt is made to give the sole a certain and desired spring behaviour by means of the geometric design of the sole. This means that the sole exhibits a desired deformation behaviour in the vertical direction when subjected to the weight of the wearer of the shoe, in particular a certain characteristic curve between the force applied and the strain in the vertical direction.
A sole of the type mentioned above is known from U.S. Pat. No. 2,983,056 A. The body of the sole is provided here in transverse direction with a plurality of recesses, which are formed circularly, laterally on the sole, thus seen in transverse direction. The recesses have different diameters, whereby one with a smaller diameter is located between two recesses with a larger diameter. Such recesses can be used to influence the spring or damping behaviour of the sole.
The invention is based on the object to further develop a shoe sole of the type mentioned above in such a way that it becomes possible to influence the spring and damping behaviour of the sole in a desired, predetermined improved manner.
The solution of this object by the invention is characterized in that there is a first group of recesses which (without external forces on the sole) are larger in the vertical direction than in the longitudinal direction, and that there is a second group of recesses which (without external forces on the sole) are smaller in the vertical direction than in the longitudinal direction, wherein at least in sections, at least one row of recesses is arranged adjacent to each other in the longitudinal direction, wherein a recess of the second group is arranged between two recesses of the first group.
At least in sections an upper row of recesses and a lower row of recesses can thereby be arranged above one another in the vertical direction. The two rows are in this case preferably arranged relative to each other in such a way that a recess of the first group lies vertically above a recess of the second group.
The recesses penetrate preferably at least partially the sole completely in the transverse direction.
The recesses extend thereby preferably along a straight line, they are thus designed straight and linear respectively.
Without external forces on the sole, preferably the largest dimension of a recess in a first direction is thereby at least 150%, preferably at least 180%, of the largest dimension of the recess in a second direction perpendicular to the first direction. Thereby, it is specifically preferred that the recesses, seen in the transverse direction, have a peripheral contour which has the shape of an eight. The recess has in this case in a central region preferably a restriction with a minimum extension which is at most 90%, preferably at most 80%, of the largest dimension in the second direction.
The largest dimension is thereby preferably between 8 mm and 18 mm, specifically preferred between 10 mm and 15 mm.
The wall thickness of the material of the sole remaining between the recesses is preferably substantially constant at least in sections. Insofar, it is preferred that the wall thickness at least in sections is in a range between 80% and 120% of an average value of the wall thickness (the average value of the wall thickness is the arithmetic mean, which is determined for the respective wall thicknesses between adjacent recesses over a given defined area of the lateral surface of the sole).
The sole consists preferably of polyurethane material, thermoplastic polyurethane (TPU) or thermoplastic elastomer (TPE) or comprises at least this material. The material of the sole is thereby preferably foamed.
The material of the sole has preferably a density between 0.20 and 0.50 g/cm3. It has preferably a hardness between 30 and 50 Asker C.
The sole can be designed as a midsole. Thereby, it is possible that an outer sole is placed below the midsole.
The recesses are preferably arranged in the longitudinal direction over at least 33% of the total longitudinal extension of the sole. They are preferably arranged at least in a midfoot region and a rearfoot region of the sole.
The proposed design of the sole makes it possible to influence the control of the spring and cushioning properties or the hardness of the sole in a simple way. By the design of the recesses it is possible to realize a desired spring deflection when the sole is loaded with the weight of the wearer of the shoe equipped with the sole.
The present invention is based on the use of so-called “Mechanical Meta Material”, in which it is intended that various rows of openings (known are mainly round or oval recesses in cross-section) of different sizes are or are to be introduced into the sole in order to achieve a certain spring or cushioning behaviour of the sole. This enables “Engineered Damping”, in which the spring or damping properties obey a desired characteristic curve.
When a deformation force—caused by the weight of the wearer of the shoe—is applied, the resulting cells collapse in a special way so that special spring or damping characteristics can be realized.
In this respect, a “programmable folding or collapsing” of the sole structure is achieved, so to speak, since the structure itself forms a coherent system and the individual material sections are interdependent.
The advantages of the proposed structure can lead to a “negative stiffness”, i.e. if the sole is slightly compressed in a vertical direction, the sole collapses in a defined way. It is also possible to structure the sole in the way described above in such a way that it has a sufficient degree of elasticity on the one hand and absorbs deformation energy as a result of a deformation force on the other.
In the drawings an embodiment of the invention is shown.
Sole 1 is here designed as a midsole, to the upper side of which the (not shown) shoe upper is attached in the known manner. An outer sole 6 is attached to the bottom of the sole.
Recesses 2 are incorporated into the sole 1. Preferably, these recesses extend in transverse direction Q over the entire width of the sole 1. Details on the design and arrangement of recesses 2 are shown in
As can be seen in
A first group of recesses 2′ is designed in such a way that—without external forces on the sole 1—the recesses 2′ are larger in vertical direction V than in longitudinal direction L. Then there is a second group of recesses 2″, which—again without external forces on the sole 1—are smaller in vertical direction V than in longitudinal direction L. As can be seen in
The individual recesses 2′, 2″ are each designed in such a way that they have the shape of an “eight” when viewed in transverse direction Q. Reference is made in particular to
Accordingly, each recess 2′, 2″ has in a first direction R1 a largest dimension G (which is preferably between 10 mm and 15 mm); in a second direction R2, which is perpendicular to the first direction R1, the largest dimension of recess 2′, 2″ is denoted with K. The dimension G is preferably at least 150% (particularly preferably even at least 180%) of the dimension K.
In the central area along the extension in the first direction R1, the recess 2′, 2″ has a restriction 5 (which results in the shape of an “eight”), so that the recess 2′, 2″ has a minimal extension k here. This minimum extension k is preferably at most 90%, especially preferably at most 80%, of the dimension K.
The remaining wall thickness t, which results between adjacent recesses 2′, 2″, must also be mentioned. This is denoted in
Through the proposed design, it can be achieved that the sole of the shoe has a special spring or cushioning behaviour, whereby, in particular when subjected to the weight of the wearer of the shoe, a predetermined collapse of the sole occurs as a result of the recesses, which provides a pleasant feeling of wear.
Filing Document | Filing Date | Country | Kind |
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PCT/EP2018/061934 | 5/8/2018 | WO |
Publishing Document | Publishing Date | Country | Kind |
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WO2019/214814 | 11/14/2019 | WO | A |
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Entry |
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Number | Date | Country | |
---|---|---|---|
20210235813 A1 | Aug 2021 | US |