SOLE FOR A RUNNING SHOE

Description

Technical field

[0001] The invention relates to the field of shoe technology, in particular for sports and leisure shoes, and concerns a sole for a running shoe. State of the art

[0002] A variety of running shoes with various cushioning systems are known in the state of the art. Sports and leisure shoes with soles featuring a gel core in the heel area to ensure vertical cushioning during impact are widespread. Furthermore, improvements in vertical cushioning properties have been achieved by placing individual spring elements in the heel area between the outsole and insole.

[0003] While the aforementioned soles improve the vertical cushioning properties of the shoes, they cannot provide satisfactory cushioning for horizontal forces acting on the sole and shoe. Forces with a large horizontal component are further amplified, especially on uneven terrain, and due to a lack of adequate cushioning, they are one of the main causes of frequent knee and hip pain.

[0004] WO 2016 184 920, owned by the applicant, discloses a sole comprising downwardly protruding, laterally open, segmented, and groove-shaped elements. Under the influence of the forces generated during walking, the groove-shaped elements are deformable both vertically and horizontally until their lateral openings close. Segmenting the sole also segments the cushioning effect, creating non-cushioned or less cushioned areas in the sole.

[0005] US 6 205 681 B1, US 2019 289 961 A1 and US 6 389 713 B1 disclose further soles known in the prior art. Description of the invention

[0006] In many sporting activities, such as running, the shoe's initial contact with the ground occurs in the heel area. As a result, the forces acting on the shoe are significantly greater in this area than in the forefoot or midfoot areas of the sole. To accommodate this, running shoes generally feature particularly pronounced cushioning in the heel area. While such a design at least allows for sufficient vertical cushioning, this pronounced cushioning has a negative impact on the overall weight of the shoe. As a result, the running shoes known from the prior art either have unsatisfactory cushioning and / or are heavy.

[0007] Furthermore, a satisfactory cushioning effect can be ensured with known cushioning systems. However, due to the soft components, such as gel cores or soft elastic foams, such cushioning systems lead to a loss of energy during the runner's rolling and toe-off process. This means that additional energy must be expended for the toe-off with each step, which can lead to faster fatigue in the runner. This effect increases with increasing midsole softness. One problem with the state of the art is therefore finding a compromise between the softness of the midsole to increase the cushioning effect at impact and the stiffness of the midsole to avoid energy loss during the toe-off.

[0008] 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.

[0009] In some embodiments, a sole is provided which, on the one hand, achieves a satisfactory cushioning effect, in particular in the horizontal and vertical directions, and at the same time reduces energy losses during the impression process and preferably provides additional energy for the impression process.

[0010] In some embodiments, a sole is provided which is lightweight.

[0011] According to a first aspect of the invention, the general problem is solved by a sole for a running shoe with a midsole, wherein the midsole has a soft-elastic upper layer and a soft-elastic lower layer. In addition, a flexurally elastic, incompressible plate is arranged vertically between the upper layer and the lower layer. The lower layer has several channels running transversely to the midsole, which channels are vertically and / or horizontally deformable in the longitudinal direction under the action of vertically and / or longitudinally acting forces occurring during running. The channels of the lower layer are delimited by the soft-elastic lower layer and by the flexurally elastic, incompressible plate. 10 to 35%, in particular 20 to 35%, preferably 25 to 35%, of the surface of the flexurally elastic, incompressible plate is exposed through the channels of the lower layer.Preferably, the channels of the underlayer of the midsole are deformable vertically and / or horizontally in the longitudinal direction until closure under the effect of vertical and / or longitudinal forces occurring during running.

[0012] The midsole is constructed in layers and, in some embodiments, can be described as a sandwich structure. From the underside of the sole, or from the ground, the bottom layer is arranged first, followed by the flexurally elastic, incompressible plate, and then the upper layer. The fact that the incompressible plate is positioned vertically between the upper layer and the bottom layer means that, compared to an arrangement above the midsole, the plate in the sole can be bent more easily during the rolling motion and has a lower bending moment, as the movement and force emanating from the runner's foot are transferred more efficiently through the upper layer to the flexurally elastic, incompressible plate. This effect is further enhanced by the channels, as they make the midsole more flexible and easier to bend.Thus, the plate is tensioned during the rolling process and, due to its flexurally elastic, incompressible properties, provides a restoring force that supplies additional energy for the impression process. At the same time, the channels arranged in the base layer enable an efficient and satisfactory damping effect.

[0013] Directional information as used in the present disclosure is to be understood as follows: The longitudinal direction L of the sole is described by an axis from the heel region to the forefoot region and thus extends along the longitudinal axis of the sole. The transverse direction Q of the sole runs transversely to the longitudinal axis and substantially parallel to the underside of the sole, or substantially parallel to the ground. Thus, the transverse direction runs along a transverse axis of the midsole. The vertical direction V in the context of the present invention refers to a direction from the underside of the sole towards the insole, or in the operative state towards 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 refers to the outer region of the midsole along the longitudinal axis, which in one pair of running shoes faces the other running shoe when worn. Accordingly, the outside of the midsole of a pair of running shoes refers to the outer region 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 the inside. Furthermore, the lateral region of the midsole refers to an area along the lateral inner and outer sides of the midsole of a pair of running shoes, whereby the area extends in the direction of the longitudinal axis of the midsole. Typically, the horizontal extent of the lateral region is a few centimeters, for example 0.1 to 5 cm, preferably 0.5 to 3 cm.The medial region of the midsole refers to an area along the longitudinal axis in the middle of the midsole, which extends in the transverse direction of the midsole. Typically, the horizontal extent of the medial region is a few centimeters, for example, 0.1 to 5 cm, preferably 0.5 to 3 cm.

[0014] Soft-elastic materials for soles are well known to those skilled in the art. For example, materials with a Young's modulus of approximately 0.0001 to 0.2 GPa, in particular 0.001 to 0.1 GPa, can be used, which can be considered a soft-elastic material within the meaning of the present invention. Such materials can typically comprise polymer foams. Soft-elastic materials can include 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.

[0015] The forces that occur when running are typically due to the weight of the wearer, which can be between 40 and 120 kg, in particular between 50 and 100 kg.

[0016] For the purposes of the present invention, a channel is understood to be a recess which can typically be tubular. In general, a channel is wholly or partially delimited by channel walls. Typically, the channels are empty. In particular, the channels can be open and continuous, i.e. a channel is preferably not a blind hole. In preferred embodiments, the channels of the underlayer can run substantially parallel to one another. In some embodiments, the total proportion of the open surface of the midsole, i.e. the total proportion of the lateral surfaces of the channel openings, can be smaller than the total part of the closed surface of the midsole, i.e. the total part of the outer surface of the midsole that does not have channels.

[0017] It is clear to those skilled in the art that the deformability of the channels can include, for example, vertical convergence of the channel walls and / or longitudinal shearing of the channel. Typically, the upper and lower channel walls can touch under the action of the forces occurring during movement, causing the corresponding channel to deform until it is laterally closed. A channel wall can be formed by the flexible upper or lower layer and / or by the flexurally elastic, incompressible plate.

[0018] The flexurally elastic, incompressible plate can be made of a hard polymer, e.g. LDPE, HDPE, polypropylene, polyether block amide (PEBA, for example PEBAX ®< ), etc. and / or of carbon fibers or mixtures thereof. The flexurally elastic, incompressible plate is therefore preferably made of a different material than the upper layer and the lower layer. A flexurally elastic plate within the meaning 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, ie an extension in the vertical direction, of up to 5 mm, in particular 1 to 5 mm, preferably 1 to 3 mm.

[0019] In some embodiments, the thickness of the top layer in the vertical direction may be 0.3 to 2 cm.

[0020] In some embodiments, the upper layer can have several channels running in the transverse direction. On the one hand, these channels further improve the cushioning effect of the midsole and, on the other hand, make the upper layer more flexible, which facilitates the bending of the flexurally elastic, incompressible plate and thus facilitates the rolling process. In addition, the energy of the imprint is increased because the recovery of the plate bent during rolling is improved during the imprint. In preferred embodiments, the channels of the upper layer can run essentially parallel to one another. Typically, the channels of the lower layer and the upper layer are designed such that when walking 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 topsheet are vertically and / or horizontally deformable in the longitudinal direction under the action of vertical and / or longitudinal forces occurring during running. Preferably, the channels of the topsheet are vertically and / or horizontally deformable in the longitudinal direction until closure under the action of vertical and / or longitudinal forces occurring during running.

[0021] In further embodiments, the channels of the upper layer can be offset horizontally 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 midfoot and heel area without the channels having to be overly large, which would render the sole unstable. Furthermore, due to the separation of the upper layer and lower layer by the flexurally elastic, incompressible plate, instabilities, particularly a floating effect, are avoided.

[0022] In some embodiments, the channels of the upper layer can be offset horizontally in the longitudinal direction relative to the channels of the lower layer such that the channels of the upper layer and the lower layer do not overlap vertically. In such embodiments, therefore, no channel is preferably arranged 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, thereby further improving the cushioning effect because the cushioning is not segmented and a cushioning effect is achieved in practically all relevant areas of the midsole. In addition, the flexibility of the midsole is increased during the rolling movement because the channel walls in the upper layer narrow during the rolling movement, or the channels are closed, thus facilitating the bending of the flexurally elastic, incompressible plate.

[0023] Typically, at least some or all of the channels of the topsheet are vertically and / or horizontally deformable in the longitudinal direction until closure under the action of vertically and / or longitudinally acting forces occurring during running.

[0024] In some embodiments, the channels of the upper layer and / or the lower layer have lateral openings in the lateral region of the midsole. The channels are preferably vertically and / or horizontally deformable in the longitudinal direction under the action of vertically and / or longitudinally acting forces occurring during walking until the lateral openings are closed.

[0025] In further embodiments, the channels in the upper layer and / or the lower layer are arranged at least in the heel region and the midfoot region. In some embodiments, the channels in the upper layer and / or the lower layer are arranged in the heel region, midfoot region, and forefoot region. In particular, the channels can be arranged longitudinally in the upper layer and / or the lower layer from the heel to the metatarsophalangeal joint of the wearer.

[0026] In some embodiments, the channels of the lower layer are formed entirely or partially by transversely oriented groove-shaped elements that protrude downwards towards the ground. Only some of the channels of the lower layer, in particular a large portion, or even all of the channels of the lower layer can be formed by groove-shaped elements. Such elements have the advantage that they can be deformed and closed, particularly horizontally in the longitudinal direction, and thus provide good horizontal cushioning, which has a joint-protecting effect, especially on downhill paths. The groove-shaped elements can be U-shaped in cross-section. Preferably, the groove-shaped elements have a recess between them, which is arranged to make the midsole more flexible and to facilitate the rolling movement by reducing the bending moment of the flexurally elastic, incompressible plate in the sole.Preferably, the groove-shaped elements can be arranged such that at least one recess is located below a channel of the upper layer, thereby facilitating the bending of the plate and thus the rolling motion. The recesses between the groove-shaped elements can define predetermined bending points of the midsole.

[0027] In some embodiments, the channels of the upper layer are delimited by the soft-elastic upper layer and by the flexurally elastic, incompressible plate. 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 environment and is thus only partially covered by the upper layer and / or the lower layer. The channels, which are partially delimited by the plate, facilitate the bending of the plate during the rolling movement, since the compressive and tensile stresses on the plate are significantly reduced by the partial exposure of the plate due to the channels. This enables more efficient energy transfer during impression making, and it also allows stiffer plates to be used than would be possible without such channels.Without such channels, relatively stiff plates would no longer be able to flex easily during normal running, significantly reducing running comfort. However, the use of stiffer plates has the advantage of providing correspondingly higher energy for the push-off. Furthermore, such a construction allows for a thinner overall midsole, which significantly reduces its weight. In particular, the

[0028] Channels in the upper layer, which are defined by the flexurally elastic incompressible plate, expose 10 to 30%, in particular 20 to 30%, preferably 25 to 30% of the surface of the flexurally elastic incompressible plate. The channels in the lower layer expose 10 to 35%, in particular 20 to 35%, preferably 25 to 35% of the surface of the flexurally elastic incompressible plate. This significantly reduces the bending moment of the plate in the sole and enables efficient energy transfer.

[0029] In further embodiments, the flexurally elastic, incompressible plate extends substantially completely from the inside to the outside of the midsole. In such embodiments, the incompressible plate can be directly exposed to the environment on the inside and / or outside and thus visible. The plate can thus completely separate the upper layer and the lower layer from each other. "Substantially completely" is understood to mean that the plate extends over at least 90%, preferably at least 95%, preferably at least 98% of the area of ​​the upper layer.

[0030] In some embodiments, the channels of the lower layer and / or the channels of the upper layer are elongated in cross-section along the longitudinal direction of the midsole. Thus, the height of the channels (extension in the vertical direction) is smaller than the width of the channels (extension in the longitudinal direction), thereby achieving a smaller overall thickness of the midsole and thus a reduction in the weight of the sole.

[0031] In further embodiments, the midsole has a groove extending longitudinally from the heel area to at least the midfoot area. The groove is thus located in the medial region of the sole. On the one hand, the groove enables a weight reduction of the sole, but on the other hand, due to its medial position, does not result in a significant reduction in the cushioning effect. In some embodiments, the groove can extend vertically directly to the flexurally elastic, incompressible plate, so that it is partially exposed to the surroundings in the region of the groove and can therefore be visible from the underside of the sole. Since no additional sole material is arranged in the region of the groove, the groove also facilitates the bending of the plate when walking by reducing the bending moment of the plate in the sole, thereby making the rolling process more comfortable and correspondingly increasing support during the push-off.The channel is particularly preferably essentially V-shaped, so that the sides of the channel are inclined. This prevents stones and pieces of wood from getting trapped. The channels in the transverse direction of the sublayer can preferably be open towards the channel.

[0032] A design in which the groove extends from the heel to the midfoot area has proven particularly advantageous. This groove allows for better deformability of the channels, which is particularly advantageous with thicker walls, such as those typically found in the heel and midfoot areas. In the forefoot area, however, a significantly weaker cushioning effect is typically required, which is why the channel walls in this area are thinner and thus more easily deformable than the channels in the heel and midfoot areas.

[0033] Preferably, the groove extends to the heel edge. This splits the soft, elastic midsole in the heel area. The two parts can move slightly apart in a transverse direction upon landing, further increasing the cushioning effect.

[0034] In some embodiments, the channels of the lower layer have a vertical height of 0.1 to 2.0 cm, preferably 0.2 to 1.0 cm, and the channels of the upper layer have a vertical height of 0.1 to 1.0 cm, preferably 0.2 to 0.5 cm. The height defines the distance between the respective channel walls in the vertical direction.

[0035] In further embodiments, the lower layer is attached to the flexurally elastic, incompressible plate. For example, the lower layer can be glued or welded. The flexurally elastic, incompressible plate can also be attached to the upper layer by gluing or welding.

[0036] In some embodiments, at least one channel of the underlayer, preferably all channels in the heel area and in the forefoot area, can have a front wall with a step in the area of ​​the flexurally elastic, incompressible plate. The front wall typically refers to the wall of the channel that forms the front boundary of the channel in the longitudinal direction, i.e., in the running direction. Accordingly, the rear wall of the channel is the wall that 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 region of the front wall that directly adjoins the flexurally elastic, incompressible plate and has a greater gradient than the adjoining second region of the front wall. For example, the first region can be formed substantially perpendicular to the flexurally elastic, incompressible plate, e.g., at an angle of 80-90°.The adjacent second section 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 horizontal shear and thus closure of the canal, efficiently absorbing horizontal forces.

[0037] In further embodiments, at least one channel of the lower layer, preferably all channels in the heel area and the midfoot area, can have a front wall and a rear wall, wherein the front wall is arranged at an angle to the flexurally elastic, incompressible plate that is smaller than the angle at which the rear wall of the channel is arranged to the flexurally elastic, incompressible plate. This facilitates horizontal shear and thus the closure of the channel, which improves the damping of horizontally acting forces.

[0038] In some embodiments, the midsole is curved upwards in the forefoot area in a vertical direction. In particular, the forefoot area can be curved upwards at an angle of 25 to 35° in the vertical direction. Since the flexurally elastic, incompressible plate is also curved upwards in the same way, the rolling motion is facilitated, meaning the runner reaches the push-off position with less effort, in which only the forefoot area is in contact with the ground. This reduces energy loss and fatigue for the runner.

[0039] In further embodiments, the heel area of ​​the midsole can be raised vertically toward the heel edge. This can improve the runner's initial contact with the ground and support the rolling motion, thus requiring less energy.

[0040] In further embodiments, the longitudinally rearmost channel of the midsole, i.e., the channel closest to the heel edge of the midsole, is positioned such that, when worn, it lies directly beneath the wearer's heel. This achieves the greatest possible cushioning upon initial contact with the ground. 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.

[0041] In some embodiments, the sole may comprise an outsole attached to the midsole, in particular directly to the underlayer. The outsole may have anti-slip properties. In particular, the outsole may be structured. The structuring may comprise regular or irregular grooves and / or furrows.

[0042] The outsole can preferably have cross-shaped structures. This ensures particularly good traction. Typically, the outsole is made of a different material than the midsole. In particular, the outsole can be made of an abrasion-resistant material such as TPU, polypropylene, or another suitable material.

[0043] The outsole can preferably only be attached to a portion of the midsole, so that part of the midsole has no outsole. In this case, it has proven particularly advantageous if a structured outsole is provided in the lateral region of the outer side of the midsole, especially in the heel area, midfoot area, and forefoot area, since due to anatomical conditions, landing and imprint occur primarily in the lateral area on the outer side. On the other hand, at least a portion of the midsole, preferably in the midfoot area, in the lateral area on the inner side of the midsole, can have no outsole. This can achieve significant time and cost savings during production without impairing the anti-slip properties of the sole. An outsole is typically also attached in the forefoot area of ​​the midsole.

[0044] In some embodiments, the structuring of the outsole is designed such that in the lateral region of the lateral outer side, a structuring with sharper edges and / or a more pronounced structuring is provided than in the lateral region of the lateral inner side of the sole.

[0045] In some embodiments, the bottom layer and the top layer may not be directly connected to each other. Furthermore, the top layer may be completely separated from the bottom layer by the flexurally elastic, incompressible plate.

[0046] Typically, the upper and lower layers are manufactured separately and are therefore not integral. In some embodiments, the midsole may comprise at least two separate sole components: the upper layer and the lower layer.

[0047] A further aspect of the invention relates to a running shoe comprising a sole according to one of the embodiments described here.

[0048] A further aspect of the invention relates to the use of a sole according to one of the embodiments described here for the manufacture of a running shoe. For example, an upper can be attached to the sole according to the invention, in particular sewn and / or glued. Brief explanation of the figures

[0049] Aspects of the invention are explained in more detail with reference to the exemplary embodiments shown in the following figures and the associated description. Figure 1 shows a schematic side view of an inventive sole for a running shoe according to one embodiment of the invention; Figure 2 shows a view of the underside of an inventive sole for a running shoe according to a further embodiment of the invention; Figure 3 shows a schematic section in the transverse direction (along AA according to Fig. 2 ) of a sole according to the invention for a running shoe according to a further embodiment of the invention; Figure 4 shows a section of a channel of the Figure 1 shown sole. Ways to implement the invention

[0050] The Figure 1The embodiment of a sole for a running shoe shown comprises a midsole 1 with a soft-elastic upper layer 2 and a soft-elastic lower layer 3. A flexibly 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 ground B, has the lower layer 3 as the first layer, followed by the flexibly elastic, incompressible plate 4 and finally the upper layer 2. The flexibly elastic, incompressible plate 4 thus generally forms an intermediate layer which is arranged between the upper and lower layers. The flexibly 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 upper layer 2 from the lower layer.The lower layer 3 has a plurality of channels 31a, 31b, 31c running in the transverse direction Q (for better clarity, the other channels are not labeled), which are vertically deformable (in the vertical direction V) and / or horizontally in the longitudinal direction L until they close under the effect of forces acting vertically (in the vertical direction) and / or horizontally in the longitudinal direction L that occur during running. Furthermore, in this embodiment shown, the upper layer 2 also has a plurality of channels 21a, 21b, 21c running in the transverse direction Q (for better clarity, the other channels are not labeled), wherein at least some of the channels of the upper layer 2 are vertically deformable (in the vertical direction V) and / or horizontally in the longitudinal direction L until they close under the effect of forces acting vertically (in the vertical direction) and / or horizontally in the longitudinal direction L that occur during running. Figure 1As shown, the channels 21a, 21b, 21c of the upper layer 2 are arranged horizontally offset in the longitudinal direction L relative to the channels 31a, 31b, 31c of the lower layer 3, in such a way that the channels of the upper layer do not overlap with the channels of the lower layer in the vertical direction V. In other words, in the vertical direction V, no channel of the upper layer lies above a channel of the lower layer. In the illustrated embodiment, 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 substantially U-shaped. In the channels 31b and 31c, the angle formed by the flexurally elastic incompressible plate 4 and the front wall of the respective channels is 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 them, 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 upper layer 2, which further facilitates the rolling movement and the bending of the flexurally elastic, incompressible plate, since the recess 33a defines a predetermined bending point and the channel 21c closes or can be closed when the plate 4 is bent in the vertical direction and / or in the longitudinal direction. The channels of the upper layer 2 and the lower layer 3 in the shown in . Figure 1shown embodiment are delimited by the flexurally elastic incompressible plate 4, whereby the plate is partially exposed. The channels 21a, 21b and 21c of the upper layer are delimited in the vertical direction at their respective undersides by the plate 4 and the channels 31a, 31b and 31c are delimited in the vertical direction at their respective upper side by the plate 4. Thus, in general, at least a part of the channel wall of the channels of the upper layer 2 and / or the channels of the lower layer 3 is formed by the flexurally elastic incompressible plate 4. As shown in the side view of the Figure 1Both the channels 21a, 21b and 21c of the upper layer 2 and the channels 31a, 31b, 31c of the lower layer are shown to be elongated, ie the channel walls are spaced apart from one another at a greater distance in the longitudinal direction L than in the vertical direction V. The midsole 1 is bent upwards in the forefoot area at an angle of 25 to 35° relative to the ground B in the vertical direction V. In addition, the heel area of ​​the midsole is raised in the vertical direction V. Channel 31a, which is the channel of the lower layer 3 closest to the heel edge 5, is arranged such that it lies directly below the wearer's heel when worn.

[0051] In the Figure 2is the underside of a midsole 1 with heel area FB, midfoot area MFB and forefoot area VFB, which faces the ground when worn. A groove 6 directed towards the ground and open extends from the heel area FB into the midfoot area MFB. Outsole 7 is attached to a part of the midsole 1, or rather to the underlayer 3. It can be seen that in the midfoot area, the midsole in the lateral area on the lateral inside of the midsole, no outsole is attached. The outsole 7 has a structured design. In the embodiment shown, the structuring is designed as a cross structure. In the lateral area of ​​the lateral outside, a structuring with sharper edges and a more pronounced structuring is provided than in the lateral area of ​​the lateral inside of the sole.

[0052] In the Figure 3is a cross-section in the transverse direction Q along the channel 31b extending in the transverse direction Q (see AA in Figure 2 ). The groove 6 is essentially V-shaped, and the channel 31b in the lower layer 3 is open towards the groove 6. The sandwich structure consisting of the lower layer 3, the flexurally elastic, incompressible plate 4, and the upper layer 2 is also visible. 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 upper layer 2, which is not visible in the cross-section, is indicated by dashed lines.

[0053] In the Figure 4An enlarged section of the channel 31b of the lower layer 3 is shown. The channel 31b has a rear wall 311 and a front wall 312. The front wall 312 of the channel 31b has a step 313, which divides the front wall into a first and a second region. The first region, which directly adjoins the flexurally elastic, incompressible plate 4, is essentially perpendicular to the plate 4. The second region of the front wall 312, which adjoins the first region at the step 313, is arranged at a smaller angle to the flexurally elastic, incompressible plate 4 than the first region.

Claims

1. Sole for a running shoe having a midsole (1), wherein the midsole (1) has a soft-elastic top layer (2) and a soft-elastic bottom layer (3), wherein a flexurally elastic incompressible plate (4) is arranged in the vertical direction (V) between the top layer (2) and the bottom layer (3), and wherein the bottom layer (3) has a plurality of channels (31a, 31b, 31c) extending in the transverse direction (Q), wherein the channels of the bottom layer (3) are delimited by the soft-elastic bottom layer (3) and by the flexurally elastic incompressible plate (4), wherein 10 to 35% of the top surface of the flexurally elastic incompressible plate (4) is exposed through the channels of the bottom layer (3), wherein the channels (31a, 31b, 31c) of the bottom layer (3) are deformable vertically (V) and / or horizontally in the longitudinal direction (L) under the action of forces acting vertically (V) and / or in the longitudinal direction (L) and occurring during running.

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

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

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

5. Sole according to any of claims 2 to 4, wherein the channels (21a, 21b, 21c) of the top layer (2) are deformable vertically (V) and / or horizontally in longitudinal direction (L) until closure under the action of forces acting vertically (V) and / or in longitudinal direction (L) and occurring during walking.

6. Sole according to any of the previous claims, wherein the channels (31a, 31b, 31c) of the bottom layer (3) are formed by groove-shaped elements (32a, 32b, 32c) aligned in the transverse direction (Q) and projecting downwardly against the ground (B).

7. Sole according to any of the previous claims, wherein channels (21a, 21b, 21c) of the top layer (2) are delimited by the soft-elastic top layer (2) and by the flexurally elastic incompressible plate (4) and / or wherein the channels (31a, 31b, 31c) of the bottom layer (3) are delimited by the soft-elastic bottom layer (3) and by the flexurally elastic incompressible plate (4).

8. Sole according to any of the previous claims, wherein the flexurally elastic incompressible plate (4) extends substantially completely from the inner side to the outer side of the midsole (1).

9. Sole according to any of the previous claims, wherein the channels (31a, 31b, 31c) of the bottom layer (3) and / or the channels (21a, 21b, 21c) of the top layer (2) are elongated in cross-section in the longitudinal direction (L) of the midsole (1).

10. Sole according to any of the previous claims, wherein the midsole (1) has a groove (6) extending in longitudinal direction (L) from the heel region (FB) to at least the midfoot region (MFB).

11. Sole according to any of the previous claims, wherein the channels (31a, 31b, 31c) of the bottom layer (3) have a height in the vertical direction (V) of 0.2 to 1.0 cm and the channels (21a, 21b, 21c) of the top layer (2) have a height in the vertical direction (V) of 0.2 to 0.5 cm.

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

13. Sole according to any of the previous claims, wherein at least one channel of the bottom layer has a front wall with an edge in the region of the flexurally elastic incompressible plate.

14. Sole according to any of the previous claims, wherein at least one channel of the bottom 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. A running shoe comprising a sole according to any one of claims 1 to 14.

16. Use of a sole according to any one of claims 1 to 14 for the manufacture of a running shoe.