EP4106571A1

EP4106571A1 - Sole for a running shoe

Info

Publication number: EP4106571A1
Application number: EP21707215.6A
Authority: EP
Inventors: Olivier BERNHARD; Ilmarin Heitz; Kevin DELLION; Nils Arne ALTROGGE; Oliver HIRVONEN
Original assignee: ON Clouds GmbH
Current assignee: ON Clouds GmbH
Priority date: 2020-02-20
Filing date: 2021-02-19
Publication date: 2022-12-28
Also published as: WO2021165444A1; CH717157A1; CN115087374A; US20230140074A1

Abstract

Disclosed is a sole for a running shoe, said sole comprising a midsole (1), wherein: the midsole (1) has a flexible upper layer (2) and a flexible lower layer (3); disposed in the vertical direction (V) between the upper layer (2) and the lower layer (3) is a flexurally elastic, incompressible plate (4), and the lower layer (3) has multiple channels (31a, 31b, 31c) running in the transverse direction (Q); and the channels (31a, 31b, 31c) in the lower layer (3) can be deformed vertically (V) and/or horizontally in the longitudinal direction (L) under the effect of forces arising during running and acting vertically (V) and/or in the longitudinal direction (L).

Description

Sole for a running shoe

Technical area

The invention relates to the field of shoe technology, in particular for sports and leisure shoes, and relates to a sole for a running shoe. State of the art

In the prior art, a variety of running shoes with different damping systems is known. Sports and leisure shoes with soles that have a gel core in the heel area to ensure vertical cushioning when stepping are widespread. Furthermore, improvements in the vertical damping properties were achieved by attaching individual spring elements in the heel area between the outsole and the insole.

While the vertical damping properties of the shoes are improved by the above-mentioned soles, no satisfactory damping of forces acting horizontally on the sole and the shoe can be achieved. Forces with a large horizontal component are additionally intensified, especially on uneven stretches, and are one of the main causes of common knee and hip joint pain due to a lack of adequate cushioning.

A sole is known from WO 2016 184 920 by the applicant, which has downwardly projecting, laterally open, segmented and channel-shaped elements. Under the effect of the forces occurring while walking, the channel-shaped elements can be deformed both vertically and horizontally until their lateral openings are closed. By the segmentation of the sole, the cushioning effect is also segmented, whereby non-cushioned or less cushioned areas are formed in the sole.

Presentation of the invention

In many sporting activities, such as running, the shoe's first contact with the ground is in the heel area. As a result, the forces acting on the shoe in this area are significantly greater than in the forefoot or metatarsal area of the sole. In order to take this fact into account, running shoes generally have a particularly pronounced cushioning in the heel area. Such a construction allows at least sufficient vertical damping to be ensured, but the pronounced damping has a negative effect on the overall weight of the shoe. As a result, the running shoes known in the prior art either have an unsatisfactory damping effect and / or are heavy.

Furthermore, a satisfactory damping effect can be ensured with known damping systems, however, due to the soft components, such as gel cores or flexible foams, such damping systems lead to a loss of energy during the rolling and pressing process of the runner. In this way, additional energy has to be expended for the impression with each step, which can lead to faster fatigue of the runner. This effect increases with the softness of the midsole. It is therefore a problem of the prior art to find a compromise between the softness of the midsole to increase the cushioning effect when stepping and the stiffness of the midsole to avoid energy losses when taking the push. It is therefore the general object of the invention to further develop the state of the art in the field of soles for running shoes and preferably to overcome one or more disadvantages of the state of the art.

In some embodiments, a sole is provided which, on the one hand, achieves a satisfactory damping effect, in particular in the horizontal and vertical direction, and at the same time reduces energy losses during the impression process and preferably provides additional energy for the impression process.

In some embodiments, a sole is provided that is lightweight. According to a first aspect of the invention, the general object is achieved by a sole for a running shoe with a midsole, the midsole having a soft elastic upper layer and a soft elastic lower layer. In addition, a flexurally elastic, incompressible plate is arranged in the vertical direction between the top layer and the bottom layer. The lower layer has a plurality of channels running in the transverse direction of the midsole, which can be deformed vertically and / or horizontally in the longitudinal direction under the action of vertically and / or longitudinally acting forces occurring during running. The channels of the lower layer of the midsole are preferably deformable vertically and / or horizontally in the longitudinal direction up to the closure under the action of vertically and / or longitudinally acting forces occurring during walking. The construction of the midsole is layered and in some embodiments can be described as a sandwich structure. Seen from the underside of the sole or from the floor, the lower layer is arranged first, then the flexurally elastic, incompressible plate and then the upper layer. The fact that the incompressible plate is thus arranged in the vertical direction between the top layer and the bottom layer is made possible in comparison with FIG an arrangement above the midsole so that the plate in the sole can be bent more easily during the rolling process or has a lower bending moment, since the movement and the force emanating from the runner's foot are transmitted more efficiently through the upper layer to the flexible, incompressible plate. This effect is reinforced by the channels, as this makes the midsole more flexible and easier to bend. The plate is thus tensioned during the unwinding process and, due to its flexurally elastic, incompressible properties, provides a restoring force which provides additional energy for the impression process. At the same time, the channels arranged in the lower layer enable an efficient and satisfactory damping effect.

Directional indications as used in the present disclosure are to be understood as follows: The longitudinal direction L of the sole is described by an axis from the heel area to the forefoot area and thus extends along the longitudinal axis of the sole. The transverse direction Q of the sole runs transversely to the longitudinal axis and essentially parallel to the underside of the sole, or essentially parallel to the ground. The transverse direction thus runs along a transverse axis of the midsole. In connection with the present invention, the vertical direction V denotes a direction from the underside of the sole in the direction of the insole, or in the operational state in the direction of the wearer's foot and thus runs along a vertical axis of the midsole. The inside of the midsole of a pair of running shoes denotes the outer area of the midsole along the longitudinal axis, which in the case of a pair of running shoes faces the second running shoe when it is worn. Accordingly, the outside of the midsole of a pair of running shoes denotes the outer area of the midsole along the longitudinal axis, which in a pair of running shoes faces away from the second running shoe when worn and is thus arranged opposite to the inside. Furthermore, the lateral area of the midsole denotes an area along the lateral inner and outer sides of the midsole of the running shoe of a pair of running shoes, wherein the area extends in the direction of the longitudinal axis of the midsole. The horizontal extent of the lateral area is typically a few centimeters, for example 0.1 to 5 cm, preferably 0.5 to 3 cm. The medial area of the midsole denotes an area along the longitudinal axis in the middle of the midsole, which in each case extends in the transverse direction of the midsole. The horizontal extent of the medial area is typically a few centimeters, for example 0.1 to 5 cm, preferably 0.5 to 3 cm.

Soft elastic materials for soles are well known to those skilled in the art. For example, materials with a Young's modulus of about 0.0001 to 0.2 GPa, in particular 0.001 to 0.1 GPa, can be used, which in the context of the present invention can be viewed as a flexible material. Typically such materials can include polymer foams. Polyurethane, in particular thermoplastic polyurethane (TPU) or expanded thermoplastic polyurethane (eTPU), polyamides, e.g. PA-11, PA-12, nylon, polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) or mixtures thereof, can be used as flexible materials .

The forces occurring when running are typically due to the weight force based on the weight of the wearer, which can be between 40 and 120 kg, in particular between 50 and 100 kg, for example.

In the context of the present invention, a channel is to be understood as a recess which can typically be tubular. In general, a channel is completely or partially delimited by channel walls. Typically the channels are empty. In particular, the channels can be open and continuous, ie a channel is preferably not a blind hole. In preferred embodiments, the channels of the lower layer can run essentially parallel to one another. In some embodiments, the total portion of the opened area of the midsole, ie the total portion of the lateral areas of the channel openings, be smaller than the total part of the closed area of the midsole, ie the total part of the outer surface of the midsole that has no channels.

It is clear to the person skilled in the art that the ductility can be deformed, for example, by bringing the duct walls together vertically and / or shearing the duct in the longitudinal direction. Typically, the upper and lower canal walls can touch under the action of the forces that occur while walking, so that the corresponding canal is deformed until it closes at the side. A channel wall can be formed by the flexible top or bottom layer and / or by the flexible, incompressible plate.

The flexurally elastic incompressible plate may consist of a hard polymer, such as LDPE, HDPE, polypropylene, polyether block amide (PEBA, for example PEBAX ^®) etc. and / or therefrom, are made of carbon fibers or mixtures thereof. The flexurally elastic, incompressible plate is thus preferably made of a different material than the top layer and the bottom layer. A flexurally elastic plate in the context of the present invention can have a Young's modulus of 5 to 20 GPa, in particular 10 to 15 GPa, preferably 13 to 15 GPa. The flexurally elastic, incompressible plate can generally have a thickness, that is to say an extension in the vertical direction, of up to 5 mm, in particular 1 to 5 mm, preferably 1 to 3 mm. In some embodiments, the thickness of the top layer in the vertical direction can be 0.3 to 2 cm.

In some embodiments, the topsheet can have a plurality of transverse channels. Through these channels, on the one hand, the cushioning effect of the midsole is additionally improved and, on the other hand, the upper layer becomes more flexible, which means that the bending of the Flexibly elastic incompressible plate facilitated and thus the unwinding process is facilitated. In addition, the energy of the impression is increased, since the recovery of the plate, which is bent during unwinding, is improved during the impression. In preferred embodiments, the channels of the top layer can run essentially parallel to one another 5. Typically, the channels of the lower layer and the upper layer are designed in such a way that when running, viewed in the longitudinal direction, the channel of the lower layer collapses first and only then the corresponding channel of the upper layer. Typically, the channels of the upper layer are deformable vertically and / or horizontally in the longitudinal direction under the effect of vertically and / or longitudinally acting forces occurring when walking. The channels of the top layer are preferably deformable vertically and / or horizontally in the longitudinal direction up to the closure under the effect of vertically and / or longitudinally acting forces occurring when walking.

In further embodiments, the channels of the upper layer can be arranged horizontally offset from one another in the longitudinal direction relative to the channels of the lower layer. This has the advantage that the cushioning can be distributed at least over the entire metatarsal area and heel area without the channels having to be dimensioned excessively large, which would make the sole unstable. Due to the separation of the upper layer and the lower layer by the flexible, incompressible plate, instabilities, in particular a floating effect, are also avoided. In some embodiments, the channels of the top layer can be offset from the channels of the bottom layer in such a way that the channels of the top layer and the bottom layer do not intersect in the vertical direction. In such embodiments there is therefore preferably no channel in the upper layer above a channel in the lower layer and no channel is arranged in the lower layer below a channel in the upper layer, whereby the damping effect is additionally improved, since the damping is not segmented and practically in all relevant areas of the midsole a cushioning effect is achieved. In addition, the flexibility of the midsole is increased during the rolling movement, since the channel walls in the upper layer narrow during the rolling movement, or the channels are closed and thus facilitate the bending of the flexible, incompressible plate. Typically, at least some or all of the channels of the top layer can be deformed vertically and / or horizontally in the longitudinal direction up to the closure under the action of vertically and / or longitudinally acting forces occurring during walking.

In some embodiments, the channels of the upper layer and / or the lower layer have lateral openings in the lateral region of the midsole. Preferably, the channels can be deformed vertically and / or horizontally in the longitudinal direction under the action of vertically and / or longitudinally acting forces occurring while walking until the lateral openings are closed.

In further embodiments, the channels in the upper layer and / or the lower layer are arranged at least in the heel area and in the metatarsal area. In some embodiments, the channels in the upper layer and / or the lower layer are arranged in the heel area, metatarsal area and forefoot area. In particular, the channels can be arranged in the longitudinal direction in the upper layer and / or the lower layer from the heel to the base joint of the toe of the wearer.

In some embodiments, the channels of the lower layer are wholly or partially formed by channel-shaped elements which are oriented in the transverse direction and project downwards towards the floor. Here, only some of the channels of the lower layer, in particular a large part, or all of the channels of the lower layer can be formed by channel-shaped elements. Such elements have the advantage that they can be deformed and closed particularly horizontally in the longitudinal direction and are therefore good horizontally Provide cushioning, which is particularly gentle on the joints on descending paths. The channel-shaped elements can be U-shaped in cross section. The channel-shaped elements preferably have a recess between one another which is arranged to make the midsole more flexible and to facilitate the rolling movement by reducing the bending moment of the flexible, incompressible plate in the sole. The channel-shaped elements can preferably be arranged in such a way that at least one recess is arranged below a channel of the top layer, whereby the bending of the plate and thus the rolling movement is facilitated. The recesses between the channel-shaped elements can define intended bending points of the midsole.

In some embodiments, the channels of the top layer are delimited by the soft, elastic top layer and by the flexurally elastic, incompressible plate. Additionally or alternatively, the channels of the lower layer are delimited by the soft elastic lower layer and by the flexurally elastic incompressible plate. As a result, the surface of the flexurally elastic, incompressible plate is at least partially exposed or is directly exposed to the surroundings and thus only partially covered directly by the top layer and / or the bottom layer. The channels, which are partially delimited by the plate, thus facilitate the bending of the plate during the rolling movement, since the compressive and tensile stresses on the plate are substantially reduced by the partial exposure of the plate due to the channels. On the one hand, this enables more efficient energy transfer during the impression and, on the other hand, stiffer plates can be used than would be possible without such channels. Without such channels, relatively stiff plates would mean that the plate could no longer easily be bent during normal running movement, which would significantly reduce the walking comfort. The use of more rigid plates, however, has the advantage that the energy that can be provided for the impression is correspondingly higher. In addition, such a structure enables a lower overall thickness of the midsole, which significantly reduces its weight. In particular, the Channels in the top layer, which are delimited by the flexurally elastic incompressible plate, 10 to 30%, in particular 20 to 30%, preferably 25 to 30% of the surface of the flexurally elastic incompressible plate are exposed. Additionally or alternatively, (further) 10 to 35%, in particular 20 to 35%, preferably 25 to 35% of the surface of the flexible, incompressible plate can be exposed through the channels of the lower layer. This significantly reduces the bending moment of the plate in the sole and enables efficient energy transfer.

In further embodiments, the flexible, incompressible plate extends essentially completely from the inside to the outside of the midsole. In such embodiments, the incompressible plate can be directly exposed on the inside and / or outside of the surroundings and thus be visible. The plate can thus completely separate the top layer and the bottom layer from one another. Essentially completely is to be understood as meaning that the plate extends over at least 90%, preferably at least 95%, preferably at least 98% of the surface of the top layer. In some embodiments, the channels of the lower layer and / or the channels of the upper layer are elongated in cross section in the longitudinal direction of the midsole. Thus, the height of the channels (expansion in the vertical direction) is smaller than the width of the channels (expansion in the longitudinal direction), whereby a smaller overall thickness of the midsole and thus a reduction in the weight of the sole is achieved. In further embodiments, the midsole has a groove extending in the longitudinal direction from the heel area to at least the metatarsal area. The groove is thus located in the medial area of the sole. On the one hand, the groove enables a weight reduction of the sole, but on the other hand, due to the medial position, it does not result in any significant reduction in the damping effect. In some embodiments, the channel can extend in the vertical direction directly up to the flexurally elastic, incompressible one Plate extend so that this partially, in the area of the channel, directly exposed to the environment and thus can be visible from the underside of the sole. Since no additional sole material is arranged in the area of the channel, the channel also facilitates the bending of the plate while walking by reducing the bending moment of the plate in the sole, which makes the rolling process more pleasant and the support during the impression is increased accordingly. The channel is particularly preferably essentially V-shaped, so that the lateral flanks of the channel are inclined. This prevents stones and pieces of wood from getting jammed. The channels in the transverse direction of the lower layer can preferably be open towards the channel. An embodiment has proven to be particularly advantageous in which the groove extends from the heel to the metatarsal area. The channel enables the ducts to be deformed better, which is particularly advantageous in the case of thicker walls, as are preferably provided in the heel and metatarsal area. In the forefoot area, on the other hand, a significantly weaker damping effect is typically required, which is why the channel walls in this area are made thinner and thus more easily deformable than the channels in the heel and metatarsal area.

The groove preferably extends to the edge of the heel. This divides the soft elastic midsole in the heel area. The two parts can easily move away from each other in the transverse direction when landing, which additionally increases the damping effect.

In some embodiments, the channels of the lower layer have a height in the vertical direction of 0.1 to 2.0 cm, preferably 0.2 to 1.0 cm, and the channels of the upper layer have a height in the vertical direction of 0.1 to 1.0 cm, preferably 0.2 to 0.5 cm, on. The height defines the distance between the respective duct walls in the vertical direction. In further embodiments, the lower layer is attached to the flexurally elastic, incompressible plate. For example, the lower layer can be glued or welded on. The flexurally elastic, incompressible plate can also be attached to the top layer by gluing or welding. In some embodiments, at least one channel of the lower layer, preferably all channels in the heel area and in the forefoot area, can have a front wall with a gradation in the area of the flexible, incompressible plate. The front wall typically denotes the wall of the channel which, in the longitudinal direction, that is to say in the running direction, forms the front boundary of the channel. Accordingly, the rear wall of the channel is the wall which forms the rear boundary of the channel in the longitudinal direction and is thus arranged closer to the heel edge of the running shoe. A step can be a first area of the front wall, which is directly attached to the flexible, incompressible plate and has a greater gradient than the adjoining second area of the front wall. For example, the first area can be designed essentially perpendicular to the flexurally elastic, incompressible plate, for example at an angle of 80-90 °. The adjoining second area of the front wall can form an angle of 35 to 60 ° to the flexurally elastic, incompressible plate. A step in the front wall facilitates the horizontal shear and thus the closure of the canal in order to efficiently absorb horizontally acting forces. In further embodiments, at least one channel of the lower layer, preferably all channels in the heel area and in the metatarsal area, have a front wall and a rear wall, the front wall being arranged at an angle to the flexible, incompressible plate that is smaller than the angle at which the rear wall of the channel to the flexible, incompressible plate is arranged. This facilitates the horizontal shear and thus the closure of the channel, which improves the damping of horizontally acting forces. In some embodiments, the midsole in the forefoot area is curved upward in the vertical direction. In particular, the forefoot area can be bent upwards at an angle of 25 to 35 ° in the vertical direction. Since the flexible, incompressible plate is also bent upwards in the same way, the rolling movement is facilitated, ie the runner gets into the impression position with less effort, in which only the forefoot area is in contact with the ground. This reduces the energy loss and the runner's fatigue.

In further embodiments, the heel area of the midsole can be raised in the vertical direction towards the heel edge. This can improve the runner's first contact with the ground and support the rolling movement so that the runner needs less energy.

In further embodiments, the rearmost channel of the midsole in the longitudinal direction, i.e. that channel which is arranged closest to the heel edge of the midsole, is arranged in such a way that it lies directly below the wearer's heel when worn. This achieves the greatest possible damping on initial contact with the floor. For example, the channel can be spaced 2 to 3.5 cm longitudinally from the heel edge, i.e. the rearmost edge of the midsole.

In some embodiments, the sole can have an outsole that is attached to the midsole, in particular directly to the lower layer. The outsole can have anti-slip properties. In particular, the outsole can be structured. The structuring can have regular or irregular grooves and / or furrows.

The outsole can preferably have cross structures. This ensures particularly good traction. Typically the outsole is made of one other material like the midsole. In particular, the outsole can consist of an abrasion-resistant material such as TPU, polypropylene, or another suitable material.

The outsole can preferably only be attached to part of the midsole, so that part of the midsole does not have an outsole. It has been found to be particularly advantageous if a structured outsole is provided in the lateral area of the lateral outer side of the midsole, especially in the heel area, metatarsal area and forefoot area, since the landing and the imprint mainly in the lateral area on the lateral outer side due to the anatomical conditions he follows. In contrast, at least a part, preferably in the metatarsal area, of the midsole in the lateral area on the inner side of the midsole may not have an outsole. As a result, significant time and cost savings can be achieved in production without the anti-slip properties of the sole being impaired. An outsole is typically also attached in the forefoot area of the midsole. In some embodiments, the structuring of the outsole is designed such that a structuring with sharper edges and / or a more pronounced structuring is provided in the lateral area of the lateral outside than in the lateral area of the lateral inside of the sole.

In some embodiments, the backsheet and topsheet may not be directly bonded together. Furthermore, the upper layer can be completely separated from the lower layer by the flexurally elastic, incompressible plate.

Typically the top and bottom layers are manufactured separately and are therefore not in one piece. In some embodiments, the midsole can comprise at least two separate sole components, the upper layer and the lower layer. Another aspect of the invention relates to a running shoe comprising a sole according to one of the embodiments described here.

Another aspect of the invention relates to the use of a sole according to one of the embodiments described here for producing a running shoe. For example, an upper can be attached to the sole according to the invention, in particular sewn on and / or glued on.

Brief explanation of the figures

Aspects of the invention are explained in more detail with the aid of the exemplary embodiments shown in the following figures and the associated description. FIG. 1 shows a schematic side view of a sole according to the invention for a running shoe according to an embodiment of the invention;

FIG. 2 shows a view of the underside of a sole according to the invention for one

Running shoe according to a further embodiment of the invention;

FIG. 3 shows a schematic section in the transverse direction (along AA according to FIG. 2) 5 of a sole according to the invention for a running shoe according to a further embodiment of the invention;

FIG. 4 shows a section of a channel in the sole shown in FIG.

Ways of Carrying Out the Invention

The embodiment of a sole for a running shoe shown in FIG. 1 comprises a midsole 1 with a soft elastic upper layer 2 and a soft elastic one Lower layer 3. A flexurally elastic, incompressible plate 4 is arranged in the vertical direction V between the upper layer 2 and the lower layer 3. This results in a sandwich structure which, viewed from the bottom B, has the lower layer 3 as the first layer, followed by the flexurally elastic, incompressible plate 4 and finally the upper layer 2. The flexurally elastic, incompressible plate 4 thus generally forms an intermediate layer which is arranged between the upper and lower layers. The flexurally elastic, incompressible plate 4 extends essentially completely from the inside to the outside of the midsole 1 and is also visible from the outside. The plate thus essentially completely separates the top layer 2 from the bottom layer. The lower layer 3 has several channels 31 a, 31 b, 31 c running in the transverse direction Q (for a better overview, the other channels are not designated) which act vertically (in the vertical direction) and / or horizontally in the longitudinal direction L , forces occurring when running are vertically deformable up to the closure (in the vertical direction V) and / or in the longitudinal direction L horizontally. Furthermore, in this embodiment shown, the top layer 2 also has a plurality of channels 21 a, 21 b, 21 c running in the transverse direction Q (for a better overview, the other channels are not labeled), at least some of the channels of the top layer 2 being affected are deformable vertically (in the vertical direction) and / or in the longitudinal direction L and occurring while walking up to the closure vertically (in the vertical direction V) and / or horizontally in the longitudinal direction L. As shown in Figure 1, the channels 21 a, 21 b, 21 c of the upper layer 2 to the channels 31 a, 31 b, 31 c of the lower layer 3 are arranged horizontally offset in the longitudinal direction L in such a way that the channels of the The upper layer in the vertical direction V does not overlap with the channels of the lower layer. In other words, no channel of the upper layer lies above a channel of the lower layer in the vertical direction V. In the embodiment shown, the channels 31b, 31c of the lower layer 3 are formed by channel-shaped elements 32a and 32b. In cross section, the channel-shaped elements 32a, 32b, 32c are essentially U-shaped. For channels 31 b and 31 c is that of the flexurally elastic incompressible plate 4 and the angle formed by the front wall of the respective channels smaller than the angle formed by the flexurally elastic incompressible plate and the rear wall of the respective channels. The channel-shaped elements 32a and 32b have a recess 33a between one another, which is designed to make the midsole more flexible for the rolling movement. The recess 33a is arranged in the vertical direction V below the channel 21c of the top layer 2, which additionally facilitates the rolling movement and the bending of the flexible, incompressible plate, since the recess 33a defines a predetermined bending point and the channel 21c moves when the plate is bent 4 is closed or can be closed in the vertical direction and / or in the longitudinal direction. The channels of the upper layer 2 and the lower layer 3 in the embodiment shown in FIG. 1 are delimited by the flexurally elastic, incompressible plate 4, as a result of which the plate is partially exposed. The channels 21 a, 21 b and 21 c of the top layer are delimited in the vertical direction on their respective undersides by the plate 4 and the channels 31 a, 31 b and 31 c are delimited in the vertical direction on their respective upper side by the plate 4. Thus, in general, at least a portion of the

Channel wall of the channels of the upper layer 2 and / or the channels of the lower layer 3 formed by the flexible, incompressible plate 4. As shown in the side view of FIG Distance to each other than in the vertical direction V. The

The midsole 1 is bent upwards in the forefoot area at an angle of 25 to 35 ° relative to the floor B in the vertical direction V. In addition, the heel area of the midsole is raised in the vertical direction V. Channel 31 a, which represents the channel of the lower layer 3 arranged closest to the heel edge 5, is arranged such that it lies directly below the wearer's heel in the worn state.

In FIG. 2, the underside of a midsole 1, which faces the ground in the worn state, has a heel area FB, a metatarsal area MFB and a forefoot area VFB. One The channel 6, which is open towards the ground, extends from the heel area FB into the metatarsal area MFB. Outer sole 7 is attached to part of midsole 1 or to lower layer 3. It can be seen that in the midfoot area, the midsole in the lateral area on the inner side of the midsole, no outsole is attached. The outsole 7 is structured. In the embodiment shown, the structuring is designed as a cross structure. In this case, a structuring with sharper edges and a more pronounced structuring is provided in the lateral area of the lateral outer side than in the lateral area of the lateral inner side of the sole.

FIG. 3 shows a cross section in the transverse direction Q along the channel 31b extending in the transverse direction Q (see A-A in FIG. 2). The channel 6 is essentially V-shaped and the channel 31 b in the lower layer 3 is open towards the channel 6. The sandwich structure made up of the lower layer 3, the flexurally elastic, incompressible plate 4 and the upper layer 2 can also be seen. The flexurally elastic, incompressible plate 4 is arranged in the vertical direction V between the upper layer and the lower layer of the midsole 1. The channel 21c of the top layer 2, which is not visible in cross section, is indicated by dashed lines.

In FIG. 4, an enlarged section of the channel 31 b of the lower layer 3 is shown. The channel 31 b has a rear wall 31 1 and a front wall 31 2. The front wall 31 2 of the channel 31 b has gradation 313 which divides the front wall into a first and a second area. The first area, which rests directly on the flexible, incompressible plate 4, is essentially perpendicular to the plate 4. The second area of the front wall 31 2 adjoining the first area at the step 313 is arranged at a smaller angle to the flexible, incompressible plate 4 than the first area.

Claims

1. Sole for a running shoe with a midsole (1), the midsole (1) having a soft elastic upper layer (2) and a soft elastic lower layer (3), with in the vertical direction (V) between the upper layer (2) and the lower layer (3) a flexurally elastic incompressible plate (4) is arranged and wherein the

The lower layer (3) has several channels (31a, 31b, 31c) running in the transverse direction (Q), the channels (31a, 31b, 31c) of the lower layer (3) acting vertically (V) and / or in the longitudinal direction ( L) acting forces that occur when running are deformable vertically (V) and / or horizontally in the longitudinal direction (L).

2. Sole according to claim 1, wherein the upper layer (2) has a plurality of channels (21a, 21b, 21c) running in the transverse direction (Q).

3. Sole according to claim 2, wherein the channels (21a, 21b, 21c) of the upper layer (2) to the channels (31a, 31b, 31c) of the lower layer (3) are arranged horizontally offset in the longitudinal direction (L).

4. Sole according to claim 3, wherein the channels (21a, 21b, 21c) of the upper layer (2) are arranged offset horizontally in the longitudinal direction (L) to the channels (31a, 31b, 31c) of the lower layer (3) that the channels (21a, 21b, 21c, 31a, 31b, 31c) of the upper layer (2) and the lower layer (3) do not overlap in the vertical direction (V).

5. Sole according to one of claims 2 to 4, wherein the channels (21a, 21b, 21c) of the

The top layer (2) can be deformed vertically (V) and / or horizontally in the longitudinal direction (L) under the action of vertically (V) and / or in the longitudinal direction (L) acting forces occurring while walking up to the closure.

6. Sole according to one of the preceding claims, wherein the channels (31 a, 31 b, 31 c) of the lower layer (3) by in the transverse direction (Q) aligned, downward against the floor (B) projecting channel-shaped elements (32a, 32b , 32c).

7. Sole according to one of the preceding claims, wherein channels (21 a, 21 b, 21 c) of the upper layer (2) are limited by the flexible upper layer (2) and by the flexible, incompressible plate (4) and / or wherein the channels (31 a, 31 b, 31 c) of the lower layer (3) are bounded by the flexible lower layer (3) and by the flexible, incompressible plate (4).

8. Sole according to one of the preceding claims, wherein the flexurally elastic incompressible plate (4) is substantially completely from the inside to

Outside of the midsole (1) extends.

9. Sole according to one of the preceding claims, wherein the channels (31 a, 31 b, 31 c) of the lower layer (3) and / or the channels (21 a, 21 b, 21 c) of the upper layer (2) in cross section in Longitudinal direction (L) of the midsole (1) are elongated.

10. Sole according to one of the preceding claims, wherein the midsole (1) is one from the

Heel area (FB) to at least in the metatarsal area (MFB) in the longitudinal direction (L) extending groove (6).

11. Sole according to one of the preceding claims, wherein the channels (31 a, 31 b, 31 c) of the lower layer (3) have a height in the vertical direction (V) of 0.2 to 1 .0 cm and the channels (21 a, 21 b, 21 c) of the top layer (2) have a height in the vertical direction (V) of 0.2 to 0.5 cm.

12. Sole according to one of the preceding claims, wherein the lower layer (3) is attached, in particular glued, to the flexurally elastic, incompressible plate (4).

13. Sole according to one of the preceding claims, wherein at least one channel of the lower layer has a front wall with a gradation in the area of the flexible, incompressible plate.

14. Sole according to one of the preceding claims, wherein at least one channel of the lower layer has an angle between the front wall of the channel and the flexurally elastic incompressible plate which is smaller than the angle between the rear wall of the channel and the flexurally elastic incompressible plate.

15. Running shoe comprising a sole according to one of claims 1 to 14.

16. Use of a sole according to one of claims 1 to 14 for the production of a

Running shoes.