Sole with horizontal and vertical damping

Abstract

A sole for a running shoe with an elastic midsole (1) is disclosed, wherein the midsole (1) has several channels (41, 42, 43) extending in the transverse direction (Q) of the midsole (1) and arranged one behind the other in the longitudinal direction (L) of the midsole (1), wherein the channels (41, 41', 42, 43) or at least a part of the channels each have a lateral and / or medial opening in the midsole;and - in cross-section along a cross-sectional plane in the longitudinal direction (L) of the midsole (1) and perpendicular to the transverse direction (Q) of the midsole (1) have an anterior boundary and a posterior boundary, as well as a main longitudinal axis (411, 411', 421), along which the channels (41, 41, 42, 43) extend in a slit-like manner from their respective posterior boundary to their respective anterior boundary such that the lateral and / or medial opening of the channels narrows along the main longitudinal axis (411, 411') from the posterior boundary (414, 414') to the anterior boundary (413, 413').

Description

Technical field

[0001] The present invention relates to the field of shoe technology, in particular to a sole for a running shoe. State of the art

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

[0003] While the aforementioned insoles improve the vertical cushioning properties of the shoes, they do not provide satisfactory cushioning for forces acting horizontally on the sole and the shoe. Forces with a large horizontal component are further amplified, especially on uneven terrain, and due to insufficient cushioning, represent one of the main causes of frequently occurring knee and hip pain.

[0004] From WO 2016 184 920 of the applicant, a sole is known which has downwardly projecting, laterally open, segmented, and channel-shaped elements. Under the influence of the forces occurring during walking, the channel-shaped elements are deformable both vertically and horizontally until their lateral openings close. Due to this horizontal deformability, forces acting horizontally on the sole and the shoe, for example when walking on sloping terrain, can be efficiently dampened, thereby preventing high stress on the joints, especially the knees and hips. Description of the invention

[0005] In soles with segmented, downward-projecting, laterally open, channel-shaped elements, material fatigue can occur over extended use, depending on the sole material. This can lead to a reduction in cushioning and irreversible deformation of the lateral openings of the channel-shaped elements, as the material's elastic properties can be lost after prolonged use. Furthermore, in the sole known from WO 2016 184 920, the channel-shaped elements are each present as individual elements projecting from the sole. Depending on the wearer's weight and foot position, the lateral openings may close unevenly, potentially causing the wearer to experience a "swimming" effect. This is because the upper and lower layers of the channel-shaped elements do not lie precisely on top of each other, but rather, for example, in the transverse direction of the sole, i.e., perpendicular to the longitudinal direction.The direction of travel may be spatially shifted relative to each other.

[0006] The present invention is based on the general objective of further developing the prior art in the field of running shoe soles and preferably overcoming the disadvantages of the prior art wholly or partially. In advantageous embodiments, a sole is provided which, on the one hand, can dampen forces acting horizontally on the sole and the shoe during running, and on the other hand, exhibits no or at least less material fatigue even after prolonged use. In further advantageous embodiments, the occurrence of a "swimming effect" is avoided. In some advantageous embodiments, the damping effect in the heel area is increased compared to the prior art, while a lower damping effect is provided in the forefoot area compared to the heel area, so that significantly less force is lost during push-off and this force is practically entirely available for the push-off process.

[0007] The general problem is solved by a sole according to the independent claim. Further advantageous embodiments are described in the dependent claims, as well as in the description and drawings.

[0008] In a first aspect, the general technical problem is solved by a sole for a running shoe with an elastic midsole. The midsole has several channels running transversely and arranged one behind the other longitudinally. The channels, in particular all channels, or at least some of the channels (so-called channels of the first kind), each have: Each channel has a lateral and / or medial opening in the midsole; and each also has an anterior and a posterior boundary, as well as a main longitudinal axis, in cross-section along a cross-sectional plane longitudinally along the midsole and perpendicular to the transverse direction of the midsole. Along their respective main longitudinal axis, the channels extend in a slit-like shape from their respective posterior boundary to their respective anterior boundary, such that the lateral and / or medial opening of the channels narrows along the main longitudinal axis of the respective channel from the posterior boundary to the anterior boundary.

[0009] Such channel arrangements offer the advantage that the narrowing of the channel opening along the main longitudinal axis of the respective channel, from the rear to the front boundary, efficiently dampens both vertical and horizontal forces occurring during running. The channels are typically completely bounded by the soft, elastic midsole in the lateral and medial regions of the midsole, i.e., at least laterally and / or medially. Specifically, the channels are completely bounded by the midsole in cross-section along a plane in the longitudinal direction (L) of the midsole and perpendicular to the transverse direction (Q) of the midsole. In such an embodiment, the channel walls can therefore be formed entirely by the midsole in the lateral region.Typically, the channels in the side view of the sole can therefore be described as transverse openings in an otherwise preferably one-piece midsole. In some embodiments, the midsole is not segmented, i.e., it is segment-free. This significantly improves the durability of the sole, as the midsole is generally much more stable compared to a segmented midsole. Furthermore, fatigue of the soft, elastic midsole over the service life of the sole or running shoe is avoided or at least significantly reduced. This allows the advantageous cushioning effect of the midsole to be maintained consistently over a long period.

[0010] The main longitudinal axis of a channel runs parallel to the channel's longitudinal direction, i.e., the direction in which the channel extends in a slit-like shape, and in cross-section runs along the aforementioned cross-sectional plane through the channel's center point. The main longitudinal axis lies in the V,L plane of the midsole; that is, it does not run transversely across the midsole, but rather longitudinally and / or vertically across it. In some embodiments, the main longitudinal axis may pass through the points on the channel walls that are furthest apart in cross-section along the aforementioned cross-sectional plane. Thus, the channel walls of a channel may be further apart along the main longitudinal axis than along any other axis in the V,L plane of the corresponding channel.

[0011] A person skilled in the art understands a slot-shaped channel to be one which, in cross-section along the plane of the cross-section in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole, has an elongated, narrow contour and thus provides an elongated, narrow opening in the midsole. The width of such a channel is therefore greater than its height. Consequently, the extent of such a channel along one spatial direction is greater than along a different spatial direction within the same spatial plane, particularly in the V,L plane. A channel which has the cross-sectional shape of a square or a regular circle is therefore not slot-shaped.

[0012] The front and rear boundaries of the channel each define its limits along the main longitudinal axis at its anterior end, i.e., the end closest to the toe of the sole, and at its posterior end, i.e., the end closest to the heel edge. From the heel edge in the longitudinal direction to the toe of the sole, the anterior end of a channel is therefore positioned in front of the posterior end. However, this does not mean that the main longitudinal axis of such a channel must necessarily run parallel to the base of the midsole, or, when worn, parallel to the ground. While this is possible, it is preferred that the main longitudinal axis of one or more channels has an angle of >0° to <90° with respect to the base of the sole, or, when worn, with respect to the ground, particularly between 5° and 80°. The front and rear boundaries can, for example, be curved in cross-section along the cross-sectional plane.These are each concave towards the center of the channel, or towards the center of the channel.

[0013] In some embodiments, the channels, in particular all channels, of the midsole can generally run in cross-section along the longitudinal direction and perpendicular to the transverse direction of the midsole from their respective end nearest to the heel edge, or the rear end region, in the longitudinal direction towards their respective end nearest to the toe of the sole, or the front end region, rising vertically or parallel to the longitudinal direction. In other words, preferably none of the channels of the midsole runs in cross-section along the longitudinal direction and perpendicular to the transverse direction of the midsole from their respective end nearest to the heel edge, or the rear end region, descending vertically in the longitudinal direction towards their respective end nearest to the toe of the sole, or the front end region.The main longitudinal axis of each channel, particularly of all channels in the midsole, therefore rises vertically from the heel edge to the toe of the sole or is parallel to the longitudinal direction. However, the main longitudinal axis of each channel does not descend vertically from the heel edge to the toe of the sole.

[0014] Typically, the canals are designed such that the lateral and / or medial opening of the canals narrows along the main longitudinal axis from the posterior border to the anterior border over a large part of the canal along the main longitudinal axis, in particular over at least 30%, in particular over at least 50%, in particular over at least 70%, in particular over at least 90%, of the total width of the canal in cross-section along the longitudinal direction and perpendicular to the transverse direction along the main longitudinal axis.

[0015] In some embodiments, the channels are designed such that they assume an S-shape when completely closed, in particular when the side openings are completely closed.

[0016] The channels in the midsole are typically located at least in the heel area and optionally in the midfoot and / or forefoot area of ​​the sole. In some embodiments, the channels are located in the heel, midfoot, and forefoot areas.

[0017] Directional terms 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, i.e., perpendicular 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, denotes a direction from the underside, or base surface of the sole, towards the insole and the surface, or, in the operational state, towards the foot of the wearer, and thus runs along a vertical axis of the midsole.The lateral side of the sole is the outer edge of the sole, which rests against the outer instep of the wearer's foot when the shoe is worn. The medial side of the sole, or midsole, refers to the outer edge of the sole, which is positioned opposite the lateral side. Therefore, in a pair of running shoes, the medial sides of the two running shoes face each other when worn, and the lateral sides face away from each other.

[0018] The midsole can typically be divided longitudinally, i.e., along the direction of movement when worn, into a heel area, a forefoot area, and a midfoot area located directly between the heel and forefoot areas. The forefoot area, for example, extends from the toe of the sole, against the longitudinal direction, to 30–45% of the total longitudinal length of the midsole. The heel area, for example, extends from the edge of the heel, longitudinally, to 20–30% of the total longitudinal length of the midsole. The midfoot area lies directly between the heel and forefoot areas, so that its longitudinal length constitutes the remaining portion of the total length, specifically 15–50%.

[0019] The midsole typically has a base area that borders it in the opposite direction to the midsole's vertical axis and a surface that borders it in the vertical direction. It is understood that, when walking (i.e., in its operational state), the base area faces the ground and the surface surface faces the wearer's foot, or the insole.

[0020] A sole according to the present invention can consist of the midsole or merely comprise it. In the latter case, a sole according to the invention can, in some embodiments, include further components, such as an insole and / or an outsole made of an abrasion-resistant and / or profiled material.

[0021] Elastic, and in particular 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, particularly 0.001 to 0.1 GPa, can be used, which, within the meaning of the present invention, can be considered elastic or soft-elastic materials. Typically, such materials can include polymer foams. Elastic or soft-elastic materials can include polyolefins, polyolefin block polymers, polyvinyl acetates, in particular EVA, polyurethane, in particular thermoplastic polyurethane (TPU) or expanded thermoplastic polyurethane (eTPU), polyamides, e.g., PA-11, PA-12, nylon, polyether block amide (PEBAX®), polyethylene terephthalate (PET), or polybutylene terephthalate (PBT), or mixtures thereof.

[0022] For the purposes of the present invention, a channel is understood to be a recess, which is typically tubular in shape. Generally, a channel is wholly or partially bounded by its channel walls, except at the lateral openings. Typically, the channels are empty. In particular, the channels can be open and continuous, i.e., a channel is preferably not a blind hole. Preferably, a channel, and in particular all channels of the midsole, extend continuously from the lateral side of the midsole to the medial side of the midsole. In preferred embodiments, the channels can run substantially parallel to one another. In some embodiments, the total proportion of the open area of ​​the midsole, i.e., the total proportion of the lateral areas of the channel openings, can be smaller than the total proportion of the closed area of ​​the midsole, i.e., the total proportion of the outer surface of the midsole that does not have channels.In some embodiments, the channels are arranged exclusively in the longitudinal direction, i.e., from the heel edge to the toe of the sole, one behind the other. This does not preclude some or even all of the channels from being arranged offset from each other in the vertical direction. Preferably, no channels are arranged wholly or partially one above the other in the vertical direction.

[0023] In some embodiments, the channels are arranged longitudinally from the heel edge to the toe of the sole, one behind the other, and vertically, at least two or more channels are offset from each other. In certain embodiments, the channels are arranged in the lateral and / or medial region of the midsole in at least one first and one second horizontal plane. Here, the first and second horizontal planes are vertically offset from each other. By arranging the channels in at least one first and one second horizontal plane, a significant improvement in cushioning is achieved. Furthermore, the cushioning is no longer limited to individual areas of the sole, but extends essentially over the entire midsole.

[0024] A horizontal plane of the sole describes a plane that is essentially parallel to the underside of the sole, or essentially parallel to the ground. It should also be understood that the horizontal plane can be slightly curved. This can be the case, for example, if the sole, as is typical for running shoes, is slightly curved upwards vertically at the forefoot and / or heel.

[0025] It is clear to those skilled in the art that the deformability of the channels can include, for example, the vertical merging of the channel walls and / or the shearing of the channel in the longitudinal direction. Typically, the upper and lower channel walls can come into contact under the influence of the forces occurring during operation, so that the corresponding channel is deformed to the point of lateral closure.

[0026] In a preferred embodiment, the elastic midsole is formed in one piece. The elastic midsole thus preferably consists of a single material and is therefore more stable than a midsole consisting of several components, in particular components glued or welded together.

[0027] In a preferred embodiment, the channels have lateral openings on the lateral and medial sides of the midsole. Preferably, the channels are deformable vertically and / or horizontally in the longitudinal direction under the influence of forces acting vertically and / or longitudinally during running, until the lateral openings close. These openings can close, and in particular close completely, due to the forces occurring during running, by the channel walls touching. Thus, the channels located in the heel area, the midfoot area, and / or the forefoot area can be designed to completely close the lateral openings through the forces occurring during running.The forces occurring during running are typically due to the weight force resulting from the weight of the carrier, which can be between 40 and 120 kg, for example, and especially between 50 and 100 kg.

[0028] Typically, the upper and lower canal walls can touch under the influence of the forces that occur during running.

[0029] In some embodiments, the channels are arranged such that the respective longitudinal principal axis of the channels has a component in the vertical direction of the midsole and a component in the longitudinal direction. Such slot-shaped channels, as well as their corresponding longitudinal principal axes, therefore extend in the side view of the sole, or in cross-section, along the cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole, viewed from the base of the midsole, both longitudinally towards the toe of the sole and vertically towards the surface of the midsole.Such designs have the advantage that, due to the special arrangement of the channels combined with the narrowing of the opening towards the front boundary of the channel, particularly horizontal forces occurring during running can be efficiently dampened, as the shearing of the channel walls is facilitated, making it possible for the lateral openings to close almost completely under shear.

[0030] In some embodiments, the channels are designed essentially mirror-symmetrically to their main longitudinal axis, running along the cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole, or in the side view of the midsole. This ensures that no floating effect occurs when the openings are closed, or that this effect is significantly reduced, as the channel walls lie precisely against each other. This results in a stable stance for the wearer.

[0031] In some embodiments, the channels each have two opposing flanks that converge along the main longitudinal axis. Typically, the flanks can extend essentially linearly in cross-section from the rear boundary to the front boundary along the aforementioned cross-sectional plane, continuously approaching the main longitudinal axis.

[0032] In some embodiments, the midsole has a base surface that bounds it opposite the vertical direction of the midsole and a surface that bounds it vertically. The principal longitudinal axis of the respective channels is arranged such that it intersects the base surface and / or a tangent to it (in the case that the base surface is not a flat surface, but is curved vertically, particularly in the area of ​​the toe and / or heel edge, i.e., convex relative to the ground when worn; those skilled in the art understand that the tangent is formed at the intersection between the base surface and the principal longitudinal axis) at an angle of 5° to 85°, in particular 30° to 85°, and in particular 40° to 75°. The larger the corresponding angle, the more efficiently horizontally acting forces can be absorbed.Smaller angles are preferable in the midfoot area because, firstly, less cushioning is needed there than in the heel area, where initial contact during running typically occurs. Secondly, during push-off, which typically takes place in the forefoot and midfoot, cushioning leads to energy loss, as the cushioning initially absorbs some of the push-off force. In contrast, angles of 30° and more are preferable in the heel area because high cushioning is required there, and the heel is not directly involved in the push-off process during running.

[0033] The characteristic of an acute angle between the main longitudinal axis of a channel and the base of the midsole can also be replaced by the obtuse angle between the main longitudinal axis of the respective channel and the perpendicular to the channel through its center. The perpendicular to the channel accordingly runs through the center of the channel and is perpendicular to the base of the midsole, or intersects it at an angle of approximately 90°. In this case as well, the obtuse angle between the main longitudinal axis and the perpendicular to the respective channel of at least one channel located in the heel area is greater than the obtuse angle between the perpendicular to the respective channel and the main longitudinal axis of at least one channel located in the midfoot and / or forefoot area.Thus, in all embodiments described here, the feature of the acute angle between the longitudinal axis of a channel and the base of the midsole can be replaced by the feature of the obtuse angle between the longitudinal axis of the respective channel and the perpendicular to the respective channel. In some embodiments, the obtuse angle between the longitudinal axis and the perpendicular to the respective channel of at least one channel arranged in the forefoot region, in particular of all channels arranged in the forefoot region, is between 90° and 175°, more specifically 90° and 165°. Those skilled in the art understand that an obtuse angle lies between 90° and 180° and an acute angle lies between 0° and 90°.

[0034] In some embodiments, the channels along the cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole each have a pentagonal, hexagonal, and / or teardrop-shaped, in particular lanceolate, contour. It is also possible for one or more channels of the midsole to have a different contour than other channels of the midsole. In particular, the midsole can have up to five channels with different contours. A teardrop-shaped contour is defined as a shape that essentially consists of an isosceles triangle and an adjoining circular segment. Those skilled in the art understand that these contours also include shapes with rounded corners, i.e., a rectangle with rounded corners. A teardrop-shaped contour is particularly preferred, especially when the portion of the circular segment of the teardrop shape is oriented towards the base.This allows for particularly high horizontal cushioning of forces acting in a horizontal direction while running. Furthermore, a teardrop-shaped contour enables a particularly controlled closure of the channels, thus preventing a swimming effect. This is because channels with a teardrop-shaped contour are specifically designed to assume an S-shape when closed. Therefore, it follows that channels with a teardrop-shaped contour are primarily located in the heel area. In the forefoot and / or midfoot area, however, channels with a different contour along the cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole, in particular a rectangular, pentagonal, and / or hexagonal contour, can be provided.

[0035] In some embodiments, at least some or even all of the channels are designed to completely close their lateral openings under the forces generated during walking. This achieves good cushioning through the collapse of the channels upon impact, while simultaneously ensuring a secure stance at the moment of maximum load due to the complete closure, as further lateral and / or longitudinal displacement is prevented.

[0036] In some embodiments, the midsole is divided into a heel area, a forefoot area, and a midfoot area located between the heel and forefoot areas. The channels described in the embodiments above are arranged at least in the heel area and / or the midfoot area. Preferably, these channels are arranged at least in the heel area, since this is where the greatest stress occurs during impact.

[0037] In some embodiments, the longitudinal axis of a channel intersects the base surface, or a tangent at the intersection of the longitudinal axis and the base surface, at an acute angle. The acute angle between the longitudinal axis and the base surface, or the corresponding tangent, of at least one channel located in the heel region is greater than the acute angle between the base surface and the longitudinal axis of at least one channel located in the midfoot and / or forefoot region.It has been shown that the elongated contour of the channel, combined with the fact that the acute angle between the base and the main longitudinal axis of at least one channel in the heel area is larger than in a channel in the midfoot and / or forefoot area, results in significantly increased cushioning in the heel area. Conversely, the smaller acute angle between the base and the main longitudinal axis in the forefoot and / or midfoot area results in less cushioning. This means that during push-off, which occurs almost entirely via the forefoot and optionally the midfoot, very little energy is lost through cushioning. Furthermore, the increased acute angle of the channel(s) in the heel area not only provides vertical cushioning but also significant horizontal cushioning against forces acting horizontally during running.Preferably, all channels in the heel area of ​​the midsole have a larger acute angle between the base surface and its respective main longitudinal axis than all channels in the forefoot area and / or in the midfoot area.

[0038] The characteristic of an acute angle between the longitudinal axis of a channel and the base of the midsole can also be replaced by the obtuse angle between the longitudinal axis of the respective channel and the perpendicular line through the center of the respective channel. The perpendicular line thus runs through the center of the channel and is perpendicular to the base of the midsole, or intersects it at an angle of approximately 90°. The center of the channel generally lies on the longitudinal axis. In this case as well, the obtuse angle between the longitudinal axis and the perpendicular line of at least one channel located in the heel area is greater than the obtuse angle between the perpendicular line of the respective channel and the longitudinal axis of at least one channel located in the midfoot and / or forefoot area.

[0039] In some embodiments, the acute angle between the main longitudinal axis and the base of a channel arranged in the heel area, in particular of all channels arranged in the heel area, is between 35° and 85°, preferably between 40° and 75°. The relatively large angle not only achieves good vertical cushioning, but also significant horizontal cushioning, since the channels can be closed by the horizontal forces acting during running, in particular by contact between the channel walls.

[0040] In some embodiments, the obtuse angle between the main longitudinal axis and the respective perpendicular of a channel arranged in the heel area, and in particular between all channels arranged in the heel area, is between 110° and 175°, more specifically between 125° and 170°, and preferably between 125° and 165°. This relatively large angle not only achieves good vertical cushioning but also significant horizontal cushioning, as the channels can be closed by the horizontal forces acting during running, particularly by contact between the channel walls.

[0041] In some embodiments, the acute angle between the main longitudinal axis and the base surface, or the obtuse angle between the main longitudinal axis and the respective channel perpendicular, decreases from the channel closest to the heel edge of the midsole to the channel closest to the toe of the sole, particularly at least over a partial area from the heel edge into the midfoot region. In the forefoot region, the acute angle can be consistently 0°, meaning the main longitudinal axis of the channels in the forefoot region is then parallel to the base surface. As a result, viewed from channel to channel, the channels slope downwards from the heel edge towards the toe of the sole.This design achieves increased cushioning in the heel area, while the smaller acute angles between the base and the main longitudinal axis in the forefoot and / or midfoot area result in less cushioning. This minimizes energy loss during push-off. Generally, the larger the acute angle between the main longitudinal axis of a channel and the base, the greater the cushioning effect. Therefore, it is advantageous for the channel closest to the heel edge to have the largest acute angle, as this is where the required cushioning is greatest. The further a channel is positioned longitudinally towards the toe of the sole, the lower the required cushioning effect, thus requiring a smaller acute angle between the main longitudinal axis and the base.

[0042] In certain embodiments, the acute angle between the main longitudinal axis and the base surface, or the obtuse angle between the main longitudinal axis and the respective channel perpendicular, decreases continuously from the channel closest to the heel edge of the midsole towards the tip of the sole, at least in the heel area or exclusively in the heel area.

[0043] In some embodiments, the midsole additionally features channels in the forefoot area. These channels have a substantially rectangular contour along the cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole. Compared to the previously described channels with narrowing lateral openings towards the front, these can be described as channels of the second type. They differ from the channels of the first type described above in that they do not have narrowing lateral openings towards the front. The midsole always features channels of the first type but may optionally also include channels of the second type. These are preferably arranged in the forefoot area because the cushioning effect of channels of the second type is less than that of channels of the first type.While the aim is to achieve the highest possible cushioning effect in the heel area, this is not desirable in the forefoot area, as a lower cushioning effect compared to the heel area prevents a significant portion of the runner's power from being lost during push-off, thus making it practically entirely available for the push-off process.

[0044] In some embodiments, the acute angle between the main longitudinal axis and the base of at least one channel arranged in the forefoot region, and in particular between all channels arranged in the forefoot region, is between 0° and 15°, in particular between 0° and 5°, and in particular between 0° and 2°. An angle of 0° means that the main longitudinal axis of the channel and the base are substantially parallel to each other. In the case of a curved base, this parallelism refers to a tangent to the base which lies vertically below the channel. Such small angles ensure that, on the one hand, sufficient damping is provided to adequately protect the joints of the support, while on the other hand, the damping is not so great that a significant proportion of the impact energy is lost due to damping.

[0045] In some embodiments, the obtuse angle between the main longitudinal axis and the respective perpendicular of at least one channel arranged in the forefoot region, and in particular of all channels arranged in the forefoot region, is between 90° and 100°, and in particular between 90° and 95°. An obtuse angle of 90° means that the main longitudinal axis of the channel and the base surface are substantially parallel to each other. In the case of a curved base surface, this parallelism refers to a tangent to the base surface that lies vertically below the channel.

[0046] In specific embodiments, the main longitudinal axis of at least one channel arranged in the forefoot area, in particular of all the channels arranged in the forefoot area, is arranged essentially parallel to the base surface.

[0047] In some embodiments, the acute angle between the main longitudinal axis and the base of a channel arranged in the midfoot region is between 0° and 35°, preferably between 0° and 25°. The midfoot region represents an intermediate area where, on the one hand, a certain degree of cushioning is still required upon impact, but on the other hand, the cushioning effect must not be too great, since the anterior part of the midfoot region, viewed longitudinally towards the toe of the sole, is already used for pushing off the ground. Particularly preferred is an acute angle between the main longitudinal axis and the base of a channel that directly adjoins a channel in the heel region greater than 0°, for example, between 10° and 35° or 10° and 25°.In certain embodiments, the acute angle between the main longitudinal axis and the base surface of the channel located closest to the heel edge of the midsole in the midfoot area decreases continuously in the direction of the sole tip in the heel area.

[0048] In some embodiments, the obtuse angle between the main longitudinal axis and the respective perpendicular of a channel arranged in the midfoot area is between 90° and 120°, preferably between 90° and 115°.

[0049] In some embodiments, each channel has a principal lateral axis. This principal lateral axis is typically perpendicular to the respective principal longitudinal axis of the channel and runs through the center of the channel. Like the principal longitudinal axis, the principal lateral axis lies in the V,L plane, meaning it does not run transversely. The height, i.e., the direct distance between the channel walls, along the principal lateral axis of a channel located in the forefoot is less than the height along the principal lateral axis of a channel located in the midfoot and / or heel. This results in a high level of cushioning in the heel area. Simultaneously, the cushioning effect in the forefoot area is significantly less, thus reducing energy loss during push-off.

[0050] In some embodiments, the channels have a height of 0.1 cm to 1.5 cm, preferably 0.1 cm to 1 cm, along the main lateral axis.

[0051] In some embodiments, the channels each have a width of 0.5 cm to 3 cm, preferably 0.5 cm to 2 cm, along the main longitudinal axis. The width describes the distance between the channel walls along the main longitudinal axis and thus, in some embodiments, the greatest extent in the cross-sectional plane along the longitudinal direction and transversely to the transverse direction of the base.

[0052] In some embodiments, some, and in particular all, of the channels in the midsole can taper in the transverse direction from the lateral side to the medial side of the midsole. Thus, the open area of ​​such a channel decreases in cross-section along a plane parallel to the longitudinal direction and perpendicular to the transverse direction of the midsole, from the lateral side to the medial side. This has the advantage of increasing the stability of the sole, especially during impact, without significantly reducing its cushioning properties. Additionally or alternatively, some, and in particular all, of the channels in the midsole can taper in the transverse direction from the medial side to the lateral side of the midsole. These two alternatives support different running styles of the wearer, depending on whether the sole is subjected to more lateral or medial stress.It is also possible, for example, that the channels in the forefoot area taper laterally from the lateral side to the medial side of the midsole, and that the channels in the heel area taper laterally from the medial side to the lateral side of the midsole, and vice versa. Furthermore, the channels in the midfoot area can taper laterally from the lateral side to the medial side of the midsole, or from the medial side to the lateral side of the midsole.

[0053] Another aspect of the invention relates to a shoe, in particular a running shoe with a sole according to one of the embodiments described here.

[0054] Another aspect of the invention relates to the use of a sole according to one of the embodiments described here for the manufacture of a shoe, in particular a running shoe.

[0055] The following numbered embodiments remain part of the disclosure: 1. In a first embodiment, the disclosure relates to a sole for a running shoe with an elastic midsole, wherein the midsole has several channels extending transversely along the midsole and arranged one behind the other in the longitudinal direction of the midsole, wherein the channels, or at least a part of the channels, each have a lateral and / or medial opening in the midsole; and in cross-section along a cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole, have an anterior boundary and a posterior boundary, as well as a main longitudinal axis, along which the channels each extend in a slit-like manner from their respective posterior boundary to their respective anterior boundary such that the lateral and / or medial opening of the channels narrows along the main longitudinal axis from the posterior boundary to the anterior boundary. 2.In a second embodiment, the disclosure relates to a sole according to the first embodiment, wherein the channels are each arranged such that the respective longitudinal principal axis of the channels has a component in the vertical direction of the midsole and a component in the longitudinal direction. 3. In a third embodiment, the disclosure relates to a sole according to the first or second embodiment, wherein the channels are each formed along the cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole, essentially mirror-symmetrical to their longitudinal principal axis. 4. In a fourth embodiment, the disclosure relates to a sole according to one of embodiments 1-3, wherein the channels each have two opposing flanks that converge along the longitudinal principal axis. 5.In a fifth embodiment, the disclosure relates to a sole according to embodiments 1-4, wherein the midsole has a base surface bounding the midsole opposite to the vertical direction of the midsole and a surface bounding the midsole in the vertical direction, and wherein the major longitudinal axis of the respective channels intersects the base surface and / or a tangent thereto at an acute angle of 5° to 85°, in particular 30° to 85°, and in particular 40° to 75°. 6. In a sixth embodiment, the disclosure relates to a sole according to one of embodiments 1-5, wherein the channels along the cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole each have a teardrop-shaped, pentagonal and / or hexagonal contour. 7.In a seventh embodiment, the disclosure relates to a sole according to one of embodiments 1-6, wherein the channels are designed to completely close their lateral openings through the forces occurring during walking. 8. In an eighth embodiment, the disclosure relates to a sole according to one of embodiments 1-7, wherein the midsole is divided into a heel area, a forefoot area, and a midfoot area arranged between the heel area and the forefoot area, and wherein the channels are arranged at least in the heel area and / or in the midfoot area. 9.In a ninth embodiment, the disclosure relates to a sole according to the eighth embodiment, wherein the acute angle between the main longitudinal axis and the base surface of at least one channel arranged in the heel region is greater than the acute angle between the base surface and the main longitudinal axis of at least one channel arranged in the midfoot region and / or in the forefoot region. 10. In a tenth embodiment, the disclosure relates to a sole according to the ninth embodiment, wherein the acute angle between the main longitudinal axis and the base surface decreases from the channel located closest to the heel edge of the midsole to the channel located closest to the toe of the sole, in particular decreasing continuously from channel to channel. 11.In an eleventh embodiment, the disclosure relates to a sole according to one of embodiments 8-10, wherein the midsole additionally has channels in the forefoot area which have a substantially rectangular contour along the cross-sectional plane in the longitudinal direction of the midsole and perpendicular to the transverse direction of the midsole. 12. In a twelfth embodiment, the disclosure relates to a sole according to one of embodiments 8-11, wherein the acute angle between the main longitudinal axis and the base surface of at least one channel arranged in the forefoot area, in particular of all the channels arranged in the forefoot area, is between 0° and 5°, in particular 0° and 2°. 13.In a thirteenth embodiment, the disclosure relates to a sole according to the twelfth embodiment, wherein the main longitudinal axis of at least one channel arranged in the forefoot region, in particular of all the channels arranged in the forefoot region, is arranged substantially parallel to the base surface. 14. In a fourteenth embodiment, the disclosure relates to a sole according to one of embodiments 8-13, wherein the acute angle between the main longitudinal axis and the base surface of a channel arranged in the midfoot region is between 0° and 35°, preferably between 0° and 25°. 15.In a fifteenth embodiment, the disclosure relates to a sole according to one of embodiments 1-14, wherein each channel has a major lateral axis and wherein the height along the major lateral axis of a channel arranged in the forefoot region is less than the height along the major lateral axis of a channel arranged in the midfoot region and / or in the heel region (FB). 16. In a sixteenth embodiment, the disclosure relates to a sole according to one of embodiments 1-15, wherein the channels each have a height of 0.1 cm to 1.5 cm, preferably 0.1 cm to 1 cm, along the major lateral axis. 17. In a seventeenth embodiment, the disclosure relates to a sole according to one of embodiments 1-16, wherein the channels each have a width of 0.5 cm to 3 cm, preferably 0.5 cm to 2 cm, along the major longitudinal axis. 18.In an eighteenth embodiment, the disclosure relates to a shoe, in particular a running shoe, comprising a sole according to one of embodiments 1-17. In a nineteenth embodiment, the disclosure relates to the use of a sole according to one of embodiments 1-17 for the manufacture of a shoe, in particular a running shoe. Brief explanation of the characters

[0056] Aspects of the invention are explained in more detail with reference to the exemplary embodiments shown in the following figures and the accompanying description. Figure 1 shows a schematic side view of a sole according to the invention for a running shoe according to one embodiment of the invention; Figure 2a,b shows a schematic representation of a side view of a teardrop-shaped channel in the V,L plane ( Figure 2a ) and a hexagonal channel ( Figure 2b) as they are provided in embodiments of the sole according to the invention; Figure 3a, b shows a photograph of a heel area of ​​a shoe with a sole according to the invention with teardrop-shaped channels in the unloaded ( Figure 3a ) and in the contaminated ( Figure 3b ) state; Figure 4 schematically shows a side view of a running shoe with a sole according to a further embodiment of the invention; Figures 5a,b show a schematic side view of a sole according to the invention for a running shoe according to a further embodiment of the invention; Figure 6 shows a schematic side view of a shoe with a sole according to the invention for a running shoe according to a further embodiment of the invention. Ways to implement the invention

[0057] In the Figure 1Figure 1 shows a sole according to the invention for a running shoe, which has an elastic midsole 1. The midsole 1 is bounded by the base 2 opposite the vertical direction V and by the surface 3 in the vertical direction V. Furthermore, the midsole 1 is divided into a heel area FB, a midfoot area MFB, and a forefoot area VFB. As shown, these three areas are arranged sequentially in the longitudinal direction, with the midfoot area MFB positioned between the heel area FB and the forefoot area VFB. The midsole 1 comprises several channels 41, 42, 43 (for clarity, only three of the channels are labelled) extending in the transverse direction Q of the midsole 1 and arranged sequentially in the longitudinal direction L of the midsole 1. These channels can generally be arranged substantially parallel to each other in the transverse direction Q.Each channel has a lateral and a medial opening in the midsole. Furthermore, each channel has an anterior and a posterior boundary in cross-section along a cross-sectional plane in the longitudinal direction L of midsole 1 and perpendicular to the transverse direction Q of midsole 1 (see figure). Figures 2a and 2b) and a longitudinal principal axis (411) (for clarity, only the longitudinal principal axis of canal 41 is shown). It can be seen that canal 41 extends in the aforementioned cross-sectional plane, the V,L plane, along the longitudinal principal axis 411 from its posterior to its anterior border in a slit-like manner, such that the lateral and / or medial opening of canal 41 narrows along the longitudinal principal axis 411 from the posterior to the anterior border. The longitudinal principal axis 411 passes through the center point M of canal 41. Canal 41 is arranged such that its longitudinal principal axis 411 extends both in the longitudinal direction L and in the vertical direction V. Thus, the longitudinal principal axis 411 has a non-zero vector component in the longitudinal direction L and a non-zero vector component in the vertical direction V.This results in the slit-shaped channel 41 extending from the base surface 2 in both the vertical direction V and the longitudinal direction L in the lateral view of the midsole 1. Furthermore, it is evident from the . Figure 1It is evident that the channels 41 are essentially mirror-symmetrical about their longitudinal principal axis, i.e., the longitudinal principal axis forms an axis of symmetry of the channel cross-section in the V,L plane. The longitudinal principal axis 411 of the channel 41 intersects the base surface 2 at the point of intersection S. The acute angle α-41 between the longitudinal principal axis 411 and the tangent to the base surface 2 at point S lies between 5° and 85°. In addition to the longitudinal principal axis 411, the channel 41 has a lateral principal axis 412 arranged perpendicular to it, which also passes through the center point M of the channel 41. From the heel edge 5 to the toe of the sole 6, the height, i.e., the distance between the channel walls of a channel, decreases along the lateral principal axis.The height along the main lateral axis of a channel 43 located in the forefoot region VFB is less than the height along the main lateral axis of a channel 41, 42 located in the midfoot region MFB and / or in the heel region FB. The width of the channel 41 corresponds to the distance between the anterior and posterior boundaries of the channel 41 along the main longitudinal axis 411.

[0058] In the Figure 2aFigure 41 shows an enlarged view of the channel 41 along the transverse direction Q. Channel 41 has a front boundary 413 and a rear boundary 414. The dashed lines, which are perpendicular to the main longitudinal axis 411, indicate the boundaries of the front boundary 413 and the rear boundary 414. As shown, the front and rear boundaries are curved or swept in cross-section in the V,L plane and are concave, particularly towards the center of the channel. Between the front and rear boundaries 413, 414, two opposing flanks 415, 416 run converging along the main longitudinal axis 411. These flanks are essentially linear in cross-section along the V,L plane. The shape of the channel 41 along the V,L plane can be described as teardrop-shaped, specifically lanceolate.The teardrop-shaped contour essentially consists of an isosceles triangle, in this case with a rounded apex, and a spherical segment, in this case a hemisphere. Due to the special design of the channel with its lateral openings that narrow along the main longitudinal axis 411, both a horizontal force FH (acting against the longitudinal direction L) and a vertical force FV (acting in the vertical direction V) can be efficiently dampened. This is because the lateral openings partially or completely close as the flanks 415 and 416 of the channel 41 move towards each other. This allows for damping of horizontally acting forces without any segmentation of the midsole, and even in channels that are entirely formed by the midsole in the V,L plane. Figure 2bAn alternative channel shape of channel 41' is shown. This also has a front boundary 413' and a rear boundary 414', which in this case are not curved along the V,L plane, but can be described by the legs of an isosceles triangle. Between the front and rear boundaries 413' and 414' are the opposing flanks 415' and 416', which converge along the main longitudinal axis 411' from the rear boundary 414' to the front boundary 413' and thereby narrow the lateral opening of the channel 41'.

[0059] In the Figure 3aThe figure shows a running shoe with a midsole according to the invention in its unloaded state. When the vertical and horizontal forces occurring during running act on the midsole, the channels close, particularly in the longitudinal direction L, forming an essentially S-shaped channel. This allows for efficient damping of both horizontal and vertical forces occurring during running.

[0060] In the Figure 4 A running shoe with a midsole 1 according to the invention is shown in a further embodiment of the invention. In contrast to the midsole of the Figure 1 , indicates the in the Figure 4The midsole 1 shown in the heel area (FB) and partially also in the midfoot area (MFB) contains channels 41 and 42 (for clarity, only three channels are labeled). These channels have a hexagonal contour in cross-section along the V,L plane, i.e., along the cross-sectional plane in the longitudinal direction L of the midsole and perpendicular to the transverse direction Q of the midsole. This contour is an irregular hexagon. The main longitudinal axis 421 of channel 42 runs through the center of channel 42 in the V,L plane and is parallel to the longitudinal direction, i.e., the direction in which the channel extends. Furthermore, the main longitudinal axis passes through the points on the channel walls that are furthest apart in cross-section along the aforementioned cross-sectional plane. The channels in the forefoot area and partially also channels in the midfoot area have a rectangular contour with rounded corners, as shown, for example, for channel 43.These channels, located in the forefoot area, are channels of the second type, i.e., their lateral openings do not narrow along the respective main longitudinal axis from the posterior boundary to the anterior boundary, since the two opposite flanks of such a channel run parallel to each other in the longitudinal direction.

[0061] In the Figure 5aAnother embodiment of a sole with a midsole 1 according to the present invention is shown. The midsole 1 is bounded by the base 2 opposite the vertical direction V and by the surface 3 in the vertical direction V. Furthermore, the midsole 1 is divided into a heel area FB, a midfoot area MFB, and a forefoot area VFB. As shown, these three areas are arranged one after the other in the longitudinal direction, with the midfoot area MFB being located between the heel area FB and the forefoot area VFB. The midsole 1 comprises several channels 41, 42, 43 extending in the transverse direction Q of the midsole 1 and arranged one after the other in the longitudinal direction L of the midsole 1 (for clarity, only three of the channels are labelled). These channels can generally be arranged substantially parallel to one another in the transverse direction Q.Channels 41, 42, 43 each have an elongated contour in cross-section along a cross-sectional plane in the longitudinal direction L of the midsole 1 and perpendicular to the transverse direction Q of the midsole. In the coordinate system shown, this cross-sectional plane is the V,L plane. Each channel 41, 42, 43 has a longitudinal principal axis 411, 421 in cross-section along the cross-sectional plane in the longitudinal direction L and perpendicular to the transverse direction Q (for clarity, only the longitudinal principal axes of two of the channels are shown). It can be seen that the acute angle α-41 between the longitudinal principal axis 411 and the base surface 2, or the tangent at the intersection of the longitudinal principal axis 411 and the base surface 2, of channel 41 located in the heel area FB is larger than the acute angle α-42 between the base surface 2 (or the tangent at the intersection of the longitudinal principal axis 411 and the base surface 2).the tangent at the intersection of the main longitudinal axis 411 and the base surface 2) and the main longitudinal axis 421 of at least the channel 42 located in the midfoot region MFB. The angle between the main longitudinal axis and the base surface decreases continuously from channel to channel from the heel edge 5 to the toe of the sole 6 into the midfoot region and is essentially 0° in the forefoot region, i.e., the main longitudinal axis of the channels in the forefoot region VFB is parallel to the base surface 2. The channels in the heel region and some channels in the midfoot region are channels of the first type, in which the lateral openings narrow along the main longitudinal axes from the anterior to the posterior boundary. In contrast, the rectangular channels in the forefoot region have flanks arranged parallel to each other, which are also parallel to the base surface 2. These channels are therefore channels of the second type.The canals also each have a principal lateral axis 422 (for clarity, only the principal lateral axis 422 of canal 42 is shown), which is perpendicular to the principal longitudinal axis and also intersects the canal center. The height of a canal is defined as the distance between the canal walls along the principal lateral axis. As in the . Figure 1 As shown, the height along the main lateral axis of the forefoot area VFB of the channel 43 is less than the height along the main lateral axis of a channel 41, 42 arranged in the midfoot area MFB and / or in the heel area FB. The channels in the forefoot area VFB have a rectangular contour in cross-section along the cross-sectional plane in the longitudinal direction L of the midsole 1 and perpendicular to the transverse direction Q of the midsole 1.

[0062] In the Figure 5b is the embodiment of the Figure 5aInstead of the acute angles α-41 and α-42 between the longitudinal axis 411 and 421 and the base 2, or the tangent at the intersection of the longitudinal axis 411 and 421 and the base 2, the obtuse angle β-41 between the longitudinal axis 411 and the perpendicular 413 of the canal 41 is shown. The perpendicular passes through the midpoint M-41 of the canal 41, which lies on the longitudinal axis 411 and from which, in particular, the front and rear ends, or the front and rear end regions, of the canal 41 are equidistant. Furthermore, the perpendicular to the canal is perpendicular to the base 2, or to the tangent (see tangent T-41) that lies against the base 2 at the intersection of the perpendicular to the canal (see perpendicular to the canal 413) with the base 2. Similarly, the obtuse angle β-42 between the major longitudinal axis 421 of the canal 42 and the perpendicular to the canal 423 of the canal 42 is shown.The obtuse angle β-41 of the canal 41, which is located in the heel area FB, is larger than the obtuse angle β-42, which is located in the midfoot area MFB.

[0063] In the Figure 6A running shoe with a midsole 1 according to a further embodiment of the invention is shown. The main longitudinal axis 421 of the channel 42 runs in the V,L plane through the center of the channel 42 and is parallel to the longitudinal direction, i.e., the direction in which the channel extends. Furthermore, the main longitudinal axis runs through the points on the channel walls that are furthest apart in cross-section along the aforementioned cross-sectional plane. The channels are arranged one behind the other in the longitudinal direction L from the heel edge 5 to the toe 6 of the sole and are arranged in at least a first and a second horizontal plane in the lateral and / or medial region of the midsole 1. The first and second horizontal planes are vertically offset from each other.Channel 41 is arranged in the first horizontal plane and channel 42 is arranged in the second horizontal plane, which is offset vertically to it.

Claims

1. Sole for a running shoe with an elastic midsole (1), wherein the midsole (1) has several channels (41, 42, 43) extending in the transverse direction (Q) of the midsole (1) and arranged one behind the other in the longitudinal direction (L) of the midsole (1), wherein the channels (41, 41', 42, 43) or at least a part of the channels each have a lateral and / or medial opening in the midsole;- in cross-section along a cross-sectional plane in the longitudinal direction (L) of the midsole (1) and perpendicular to the transverse direction (Q) of the midsole (1) have an anterior boundary and a posterior boundary, as well as a main longitudinal axis (411, 411', 421), along which the channels (41, 41, 42, 43) extend in a slit-like manner from their respective posterior boundary to their respective anterior boundary such that the lateral and / or medial opening of the channels narrows along the main longitudinal axis (411, 411') from the posterior boundary (414, 414') to the anterior boundary (413, 413'); and - have two opposing flanks (415, 416, 415', 416') converging along the main longitudinal axis (411, 411', 421).

2. Sole according to claim 1, wherein the channels (41, 41', 42, 43) are each arranged such that the respective longitudinal main axis (411, 411', 421) of the channels (41, 41', 42, 43) has a component in the vertical direction (V) of the midsole (1) and a component in the longitudinal direction (L).

3. Sole according to claim 1 or 2, wherein the channels (41, 41', 42, 43) are each formed along the cross-sectional plane in the longitudinal direction (L) of the midsole (1) and perpendicular to the transverse direction (Q) of the midsole (1) essentially mirror-symmetric to their main longitudinal axis (411, 411', 421).

4. Sole according to one of the preceding claims, wherein the midsole has a base surface (2) limiting the midsole (1) opposite to the vertical direction (V) of the midsole and a surface (3) limiting the midsole (1) in the vertical direction (V) and wherein the longitudinal principal axis (411, 411', 421') of the respective channels (41, 41', 42, 43) intersects the base surface (2), and / or a tangent thereto at an acute angle of 5° to 85°, in particular of 30° to 85°, in particular of 40° to 75°.

5. Sole according to one of the preceding claims, wherein the channels (41, 41', 42, 43) along the cross-sectional plane in the longitudinal direction (L) of the midsole (1) and perpendicular to the transverse direction (Q) of the midsole (1) each have a teardrop-shaped, pentagonal and / or hexagonal contour.

6. Sole according to one of the preceding claims, wherein the channels (41, 41', 42, 43) are designed to completely close their lateral opening through the forces occurring during walking.

7. Sole according to one of the preceding claims, wherein the midsole (1) is divided into a heel area (FB), a forefoot area (VFB) and a midfoot area (MFB) arranged between the heel area (FB) and the forefoot area (VFB), and wherein the channels (41, 42) are arranged at least in the heel area (FB) and / or in the midfoot area (MFB).

8. Sole according to claim 7, wherein the acute angle (α-41) between the main longitudinal axis (411) and the base surface (2) of at least one channel (41) arranged in the heel area (FB) is greater than the acute angle (α-42) between the base surface (2) and the main longitudinal axis (421) of at least one channel (42, 43) arranged in the midfoot area (MFB) and / or in the forefoot area (VFB).

9. Sole according to claim 8, wherein the acute angle (α-41) between the longitudinal main axis (411) and the base surface (2) decreases from the channel (41) located closest to the heel edge (5) of the midsole (1) to the channel located closest to the sole tip (6), in particular decreasing continuously from channel to channel.

10. Sole according to one of claims 7 to 9, wherein the midsole (1) additionally has channels (43) in the forefoot area (FFO) which have a substantially rectangular contour along the cross-sectional plane in the longitudinal direction (L) of the midsole (1) and perpendicular to the transverse direction (Q) of the midsole (1).

11. Sole according to one of claims 7 to 10, wherein the acute angle between (α-42) the longitudinal main axis (421) and the base surface (2) of at least one channel (43) arranged in the forefoot area (FFO), in particular of all the channels arranged in the forefoot area (FFO), is between 0° and 5°, in particular 0° and 2°.

12. Sole according to claim 11, wherein the longitudinal main axis of at least one channel (43) arranged in the forefoot area (FFO), in particular of all the channels arranged in the forefoot area (FFO), is arranged substantially parallel to the base surface (2).

13. Sole according to one of claims 7 to 12, wherein the acute angle (α-42) between the longitudinal main axis (421) and the base surface (2) of a channel (42) arranged in the midfoot area (MFB) is between 0° and 35°, preferably between 0° and 25°.

14. Shoe, in particular running shoe, comprising a sole according to one of the preceding claims.

15. Use of a sole according to any one of claims 1 to 13 for the manufacture of a shoe, in particular a running shoe.

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